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5059 lines
128 KiB
5059 lines
128 KiB
// SPDX-License-Identifier: GPL-1.0+ |
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/* |
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* Device driver for Microgate SyncLink GT serial adapters. |
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* |
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* written by Paul Fulghum for Microgate Corporation |
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* [email protected] |
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* |
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* Microgate and SyncLink are trademarks of Microgate Corporation |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/* |
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* DEBUG OUTPUT DEFINITIONS |
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* |
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* uncomment lines below to enable specific types of debug output |
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* |
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* DBGINFO information - most verbose output |
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* DBGERR serious errors |
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* DBGBH bottom half service routine debugging |
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* DBGISR interrupt service routine debugging |
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* DBGDATA output receive and transmit data |
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* DBGTBUF output transmit DMA buffers and registers |
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* DBGRBUF output receive DMA buffers and registers |
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*/ |
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#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt |
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#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt |
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#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt |
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#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt |
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#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label)) |
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/*#define DBGTBUF(info) dump_tbufs(info)*/ |
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/*#define DBGRBUF(info) dump_rbufs(info)*/ |
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/signal.h> |
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#include <linux/sched.h> |
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#include <linux/timer.h> |
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#include <linux/interrupt.h> |
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#include <linux/pci.h> |
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#include <linux/tty.h> |
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#include <linux/tty_flip.h> |
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#include <linux/serial.h> |
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#include <linux/major.h> |
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#include <linux/string.h> |
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#include <linux/fcntl.h> |
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#include <linux/ptrace.h> |
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#include <linux/ioport.h> |
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#include <linux/mm.h> |
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#include <linux/seq_file.h> |
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#include <linux/slab.h> |
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#include <linux/netdevice.h> |
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#include <linux/vmalloc.h> |
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#include <linux/init.h> |
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#include <linux/delay.h> |
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#include <linux/ioctl.h> |
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#include <linux/termios.h> |
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#include <linux/bitops.h> |
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#include <linux/workqueue.h> |
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#include <linux/hdlc.h> |
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#include <linux/synclink.h> |
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#include <asm/io.h> |
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#include <asm/irq.h> |
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#include <asm/dma.h> |
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#include <asm/types.h> |
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#include <linux/uaccess.h> |
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#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE)) |
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#define SYNCLINK_GENERIC_HDLC 1 |
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#else |
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#define SYNCLINK_GENERIC_HDLC 0 |
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#endif |
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/* |
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* module identification |
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*/ |
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static char *driver_name = "SyncLink GT"; |
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static char *slgt_driver_name = "synclink_gt"; |
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static char *tty_dev_prefix = "ttySLG"; |
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MODULE_LICENSE("GPL"); |
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#define MGSL_MAGIC 0x5401 |
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#define MAX_DEVICES 32 |
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static const struct pci_device_id pci_table[] = { |
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{PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, |
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{PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, |
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{PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, |
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{PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,}, |
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{0,}, /* terminate list */ |
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}; |
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MODULE_DEVICE_TABLE(pci, pci_table); |
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static int init_one(struct pci_dev *dev,const struct pci_device_id *ent); |
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static void remove_one(struct pci_dev *dev); |
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static struct pci_driver pci_driver = { |
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.name = "synclink_gt", |
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.id_table = pci_table, |
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.probe = init_one, |
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.remove = remove_one, |
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}; |
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static bool pci_registered; |
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/* |
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* module configuration and status |
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*/ |
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static struct slgt_info *slgt_device_list; |
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static int slgt_device_count; |
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static int ttymajor; |
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static int debug_level; |
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static int maxframe[MAX_DEVICES]; |
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module_param(ttymajor, int, 0); |
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module_param(debug_level, int, 0); |
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module_param_array(maxframe, int, NULL, 0); |
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MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned"); |
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MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail"); |
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MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)"); |
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/* |
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* tty support and callbacks |
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*/ |
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static struct tty_driver *serial_driver; |
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static void wait_until_sent(struct tty_struct *tty, int timeout); |
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static void flush_buffer(struct tty_struct *tty); |
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static void tx_release(struct tty_struct *tty); |
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/* |
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* generic HDLC support |
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*/ |
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#define dev_to_port(D) (dev_to_hdlc(D)->priv) |
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/* |
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* device specific structures, macros and functions |
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*/ |
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#define SLGT_MAX_PORTS 4 |
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#define SLGT_REG_SIZE 256 |
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/* |
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* conditional wait facility |
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*/ |
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struct cond_wait { |
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struct cond_wait *next; |
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wait_queue_head_t q; |
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wait_queue_entry_t wait; |
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unsigned int data; |
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}; |
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static void flush_cond_wait(struct cond_wait **head); |
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/* |
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* DMA buffer descriptor and access macros |
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*/ |
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struct slgt_desc |
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{ |
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__le16 count; |
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__le16 status; |
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__le32 pbuf; /* physical address of data buffer */ |
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__le32 next; /* physical address of next descriptor */ |
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/* driver book keeping */ |
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char *buf; /* virtual address of data buffer */ |
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unsigned int pdesc; /* physical address of this descriptor */ |
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dma_addr_t buf_dma_addr; |
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unsigned short buf_count; |
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}; |
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#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b)) |
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#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b)) |
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#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b)) |
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#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0)) |
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#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b)) |
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#define desc_count(a) (le16_to_cpu((a).count)) |
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#define desc_status(a) (le16_to_cpu((a).status)) |
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#define desc_complete(a) (le16_to_cpu((a).status) & BIT15) |
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#define desc_eof(a) (le16_to_cpu((a).status) & BIT2) |
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#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1) |
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#define desc_abort(a) (le16_to_cpu((a).status) & BIT0) |
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#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3) |
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struct _input_signal_events { |
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int ri_up; |
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int ri_down; |
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int dsr_up; |
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int dsr_down; |
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int dcd_up; |
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int dcd_down; |
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int cts_up; |
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int cts_down; |
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}; |
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/* |
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* device instance data structure |
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*/ |
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struct slgt_info { |
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void *if_ptr; /* General purpose pointer (used by SPPP) */ |
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struct tty_port port; |
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struct slgt_info *next_device; /* device list link */ |
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int magic; |
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char device_name[25]; |
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struct pci_dev *pdev; |
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int port_count; /* count of ports on adapter */ |
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int adapter_num; /* adapter instance number */ |
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int port_num; /* port instance number */ |
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/* array of pointers to port contexts on this adapter */ |
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struct slgt_info *port_array[SLGT_MAX_PORTS]; |
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int line; /* tty line instance number */ |
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struct mgsl_icount icount; |
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int timeout; |
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int x_char; /* xon/xoff character */ |
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unsigned int read_status_mask; |
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unsigned int ignore_status_mask; |
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wait_queue_head_t status_event_wait_q; |
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wait_queue_head_t event_wait_q; |
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struct timer_list tx_timer; |
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struct timer_list rx_timer; |
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unsigned int gpio_present; |
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struct cond_wait *gpio_wait_q; |
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spinlock_t lock; /* spinlock for synchronizing with ISR */ |
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struct work_struct task; |
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u32 pending_bh; |
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bool bh_requested; |
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bool bh_running; |
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int isr_overflow; |
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bool irq_requested; /* true if IRQ requested */ |
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bool irq_occurred; /* for diagnostics use */ |
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/* device configuration */ |
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unsigned int bus_type; |
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unsigned int irq_level; |
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unsigned long irq_flags; |
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unsigned char __iomem * reg_addr; /* memory mapped registers address */ |
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u32 phys_reg_addr; |
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bool reg_addr_requested; |
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MGSL_PARAMS params; /* communications parameters */ |
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u32 idle_mode; |
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u32 max_frame_size; /* as set by device config */ |
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unsigned int rbuf_fill_level; |
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unsigned int rx_pio; |
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unsigned int if_mode; |
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unsigned int base_clock; |
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unsigned int xsync; |
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unsigned int xctrl; |
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/* device status */ |
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bool rx_enabled; |
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bool rx_restart; |
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bool tx_enabled; |
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bool tx_active; |
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unsigned char signals; /* serial signal states */ |
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int init_error; /* initialization error */ |
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unsigned char *tx_buf; |
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int tx_count; |
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char *flag_buf; |
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bool drop_rts_on_tx_done; |
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struct _input_signal_events input_signal_events; |
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int dcd_chkcount; /* check counts to prevent */ |
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int cts_chkcount; /* too many IRQs if a signal */ |
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int dsr_chkcount; /* is floating */ |
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int ri_chkcount; |
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char *bufs; /* virtual address of DMA buffer lists */ |
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dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */ |
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unsigned int rbuf_count; |
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struct slgt_desc *rbufs; |
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unsigned int rbuf_current; |
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unsigned int rbuf_index; |
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unsigned int rbuf_fill_index; |
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unsigned short rbuf_fill_count; |
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unsigned int tbuf_count; |
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struct slgt_desc *tbufs; |
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unsigned int tbuf_current; |
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unsigned int tbuf_start; |
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unsigned char *tmp_rbuf; |
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unsigned int tmp_rbuf_count; |
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/* SPPP/Cisco HDLC device parts */ |
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int netcount; |
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spinlock_t netlock; |
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#if SYNCLINK_GENERIC_HDLC |
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struct net_device *netdev; |
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#endif |
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}; |
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static MGSL_PARAMS default_params = { |
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.mode = MGSL_MODE_HDLC, |
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.loopback = 0, |
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.flags = HDLC_FLAG_UNDERRUN_ABORT15, |
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.encoding = HDLC_ENCODING_NRZI_SPACE, |
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.clock_speed = 0, |
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.addr_filter = 0xff, |
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.crc_type = HDLC_CRC_16_CCITT, |
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.preamble_length = HDLC_PREAMBLE_LENGTH_8BITS, |
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.preamble = HDLC_PREAMBLE_PATTERN_NONE, |
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.data_rate = 9600, |
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.data_bits = 8, |
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.stop_bits = 1, |
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.parity = ASYNC_PARITY_NONE |
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}; |
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#define BH_RECEIVE 1 |
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#define BH_TRANSMIT 2 |
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#define BH_STATUS 4 |
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#define IO_PIN_SHUTDOWN_LIMIT 100 |
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#define DMABUFSIZE 256 |
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#define DESC_LIST_SIZE 4096 |
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#define MASK_PARITY BIT1 |
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#define MASK_FRAMING BIT0 |
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#define MASK_BREAK BIT14 |
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#define MASK_OVERRUN BIT4 |
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#define GSR 0x00 /* global status */ |
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#define JCR 0x04 /* JTAG control */ |
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#define IODR 0x08 /* GPIO direction */ |
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#define IOER 0x0c /* GPIO interrupt enable */ |
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#define IOVR 0x10 /* GPIO value */ |
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#define IOSR 0x14 /* GPIO interrupt status */ |
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#define TDR 0x80 /* tx data */ |
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#define RDR 0x80 /* rx data */ |
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#define TCR 0x82 /* tx control */ |
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#define TIR 0x84 /* tx idle */ |
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#define TPR 0x85 /* tx preamble */ |
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#define RCR 0x86 /* rx control */ |
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#define VCR 0x88 /* V.24 control */ |
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#define CCR 0x89 /* clock control */ |
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#define BDR 0x8a /* baud divisor */ |
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#define SCR 0x8c /* serial control */ |
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#define SSR 0x8e /* serial status */ |
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#define RDCSR 0x90 /* rx DMA control/status */ |
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#define TDCSR 0x94 /* tx DMA control/status */ |
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#define RDDAR 0x98 /* rx DMA descriptor address */ |
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#define TDDAR 0x9c /* tx DMA descriptor address */ |
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#define XSR 0x40 /* extended sync pattern */ |
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#define XCR 0x44 /* extended control */ |
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#define RXIDLE BIT14 |
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#define RXBREAK BIT14 |
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#define IRQ_TXDATA BIT13 |
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#define IRQ_TXIDLE BIT12 |
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#define IRQ_TXUNDER BIT11 /* HDLC */ |
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#define IRQ_RXDATA BIT10 |
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#define IRQ_RXIDLE BIT9 /* HDLC */ |
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#define IRQ_RXBREAK BIT9 /* async */ |
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#define IRQ_RXOVER BIT8 |
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#define IRQ_DSR BIT7 |
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#define IRQ_CTS BIT6 |
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#define IRQ_DCD BIT5 |
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#define IRQ_RI BIT4 |
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#define IRQ_ALL 0x3ff0 |
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#define IRQ_MASTER BIT0 |
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#define slgt_irq_on(info, mask) \ |
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wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask))) |
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#define slgt_irq_off(info, mask) \ |
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wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask))) |
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static __u8 rd_reg8(struct slgt_info *info, unsigned int addr); |
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static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value); |
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static __u16 rd_reg16(struct slgt_info *info, unsigned int addr); |
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static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value); |
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static __u32 rd_reg32(struct slgt_info *info, unsigned int addr); |
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static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value); |
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static void msc_set_vcr(struct slgt_info *info); |
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static int startup(struct slgt_info *info); |
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static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info); |
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static void shutdown(struct slgt_info *info); |
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static void program_hw(struct slgt_info *info); |
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static void change_params(struct slgt_info *info); |
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static int adapter_test(struct slgt_info *info); |
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static void reset_port(struct slgt_info *info); |
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static void async_mode(struct slgt_info *info); |
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static void sync_mode(struct slgt_info *info); |
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static void rx_stop(struct slgt_info *info); |
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static void rx_start(struct slgt_info *info); |
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static void reset_rbufs(struct slgt_info *info); |
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static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last); |
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static bool rx_get_frame(struct slgt_info *info); |
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static bool rx_get_buf(struct slgt_info *info); |
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static void tx_start(struct slgt_info *info); |
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static void tx_stop(struct slgt_info *info); |
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static void tx_set_idle(struct slgt_info *info); |
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static unsigned int tbuf_bytes(struct slgt_info *info); |
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static void reset_tbufs(struct slgt_info *info); |
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static void tdma_reset(struct slgt_info *info); |
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static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count); |
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static void get_gtsignals(struct slgt_info *info); |
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static void set_gtsignals(struct slgt_info *info); |
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static void set_rate(struct slgt_info *info, u32 data_rate); |
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static void bh_transmit(struct slgt_info *info); |
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static void isr_txeom(struct slgt_info *info, unsigned short status); |
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static void tx_timeout(struct timer_list *t); |
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static void rx_timeout(struct timer_list *t); |
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/* |
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* ioctl handlers |
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*/ |
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static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount); |
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static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params); |
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static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params); |
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static int get_txidle(struct slgt_info *info, int __user *idle_mode); |
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static int set_txidle(struct slgt_info *info, int idle_mode); |
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static int tx_enable(struct slgt_info *info, int enable); |
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static int tx_abort(struct slgt_info *info); |
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static int rx_enable(struct slgt_info *info, int enable); |
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static int modem_input_wait(struct slgt_info *info,int arg); |
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static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr); |
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static int get_interface(struct slgt_info *info, int __user *if_mode); |
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static int set_interface(struct slgt_info *info, int if_mode); |
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static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); |
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static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); |
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static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio); |
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static int get_xsync(struct slgt_info *info, int __user *if_mode); |
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static int set_xsync(struct slgt_info *info, int if_mode); |
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static int get_xctrl(struct slgt_info *info, int __user *if_mode); |
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static int set_xctrl(struct slgt_info *info, int if_mode); |
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/* |
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* driver functions |
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*/ |
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static void release_resources(struct slgt_info *info); |
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/* |
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* DEBUG OUTPUT CODE |
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*/ |
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#ifndef DBGINFO |
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#define DBGINFO(fmt) |
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#endif |
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#ifndef DBGERR |
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#define DBGERR(fmt) |
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#endif |
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#ifndef DBGBH |
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#define DBGBH(fmt) |
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#endif |
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#ifndef DBGISR |
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#define DBGISR(fmt) |
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#endif |
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|
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#ifdef DBGDATA |
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static void trace_block(struct slgt_info *info, const char *data, int count, const char *label) |
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{ |
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int i; |
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int linecount; |
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printk("%s %s data:\n",info->device_name, label); |
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while(count) { |
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linecount = (count > 16) ? 16 : count; |
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for(i=0; i < linecount; i++) |
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printk("%02X ",(unsigned char)data[i]); |
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for(;i<17;i++) |
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printk(" "); |
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for(i=0;i<linecount;i++) { |
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if (data[i]>=040 && data[i]<=0176) |
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printk("%c",data[i]); |
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else |
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printk("."); |
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} |
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printk("\n"); |
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data += linecount; |
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count -= linecount; |
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} |
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} |
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#else |
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#define DBGDATA(info, buf, size, label) |
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#endif |
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#ifdef DBGTBUF |
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static void dump_tbufs(struct slgt_info *info) |
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{ |
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int i; |
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printk("tbuf_current=%d\n", info->tbuf_current); |
|
for (i=0 ; i < info->tbuf_count ; i++) { |
|
printk("%d: count=%04X status=%04X\n", |
|
i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status)); |
|
} |
|
} |
|
#else |
|
#define DBGTBUF(info) |
|
#endif |
|
|
|
#ifdef DBGRBUF |
|
static void dump_rbufs(struct slgt_info *info) |
|
{ |
|
int i; |
|
printk("rbuf_current=%d\n", info->rbuf_current); |
|
for (i=0 ; i < info->rbuf_count ; i++) { |
|
printk("%d: count=%04X status=%04X\n", |
|
i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status)); |
|
} |
|
} |
|
#else |
|
#define DBGRBUF(info) |
|
#endif |
|
|
|
static inline int sanity_check(struct slgt_info *info, char *devname, const char *name) |
|
{ |
|
#ifdef SANITY_CHECK |
|
if (!info) { |
|
printk("null struct slgt_info for (%s) in %s\n", devname, name); |
|
return 1; |
|
} |
|
if (info->magic != MGSL_MAGIC) { |
|
printk("bad magic number struct slgt_info (%s) in %s\n", devname, name); |
|
return 1; |
|
} |
|
#else |
|
if (!info) |
|
return 1; |
|
#endif |
|
return 0; |
|
} |
|
|
|
/* |
|
* line discipline callback wrappers |
|
* |
|
* The wrappers maintain line discipline references |
|
* while calling into the line discipline. |
|
* |
|
* ldisc_receive_buf - pass receive data to line discipline |
|
*/ |
|
static void ldisc_receive_buf(struct tty_struct *tty, |
|
const __u8 *data, char *flags, int count) |
|
{ |
|
struct tty_ldisc *ld; |
|
if (!tty) |
|
return; |
|
ld = tty_ldisc_ref(tty); |
|
if (ld) { |
|
if (ld->ops->receive_buf) |
|
ld->ops->receive_buf(tty, data, flags, count); |
|
tty_ldisc_deref(ld); |
|
} |
|
} |
|
|
|
/* tty callbacks */ |
|
|
|
static int open(struct tty_struct *tty, struct file *filp) |
|
{ |
|
struct slgt_info *info; |
|
int retval, line; |
|
unsigned long flags; |
|
|
|
line = tty->index; |
|
if (line >= slgt_device_count) { |
|
DBGERR(("%s: open with invalid line #%d.\n", driver_name, line)); |
|
return -ENODEV; |
|
} |
|
|
|
info = slgt_device_list; |
|
while(info && info->line != line) |
|
info = info->next_device; |
|
if (sanity_check(info, tty->name, "open")) |
|
return -ENODEV; |
|
if (info->init_error) { |
|
DBGERR(("%s init error=%d\n", info->device_name, info->init_error)); |
|
return -ENODEV; |
|
} |
|
|
|
tty->driver_data = info; |
|
info->port.tty = tty; |
|
|
|
DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count)); |
|
|
|
mutex_lock(&info->port.mutex); |
|
|
|
spin_lock_irqsave(&info->netlock, flags); |
|
if (info->netcount) { |
|
retval = -EBUSY; |
|
spin_unlock_irqrestore(&info->netlock, flags); |
|
mutex_unlock(&info->port.mutex); |
|
goto cleanup; |
|
} |
|
info->port.count++; |
|
spin_unlock_irqrestore(&info->netlock, flags); |
|
|
|
if (info->port.count == 1) { |
|
/* 1st open on this device, init hardware */ |
|
retval = startup(info); |
|
if (retval < 0) { |
|
mutex_unlock(&info->port.mutex); |
|
goto cleanup; |
|
} |
|
} |
|
mutex_unlock(&info->port.mutex); |
|
retval = block_til_ready(tty, filp, info); |
|
if (retval) { |
|
DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval)); |
|
goto cleanup; |
|
} |
|
|
|
retval = 0; |
|
|
|
cleanup: |
|
if (retval) { |
|
if (tty->count == 1) |
|
info->port.tty = NULL; /* tty layer will release tty struct */ |
|
if(info->port.count) |
|
info->port.count--; |
|
} |
|
|
|
DBGINFO(("%s open rc=%d\n", info->device_name, retval)); |
|
return retval; |
|
} |
|
|
|
static void close(struct tty_struct *tty, struct file *filp) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
|
|
if (sanity_check(info, tty->name, "close")) |
|
return; |
|
DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count)); |
|
|
|
if (tty_port_close_start(&info->port, tty, filp) == 0) |
|
goto cleanup; |
|
|
|
mutex_lock(&info->port.mutex); |
|
if (tty_port_initialized(&info->port)) |
|
wait_until_sent(tty, info->timeout); |
|
flush_buffer(tty); |
|
tty_ldisc_flush(tty); |
|
|
|
shutdown(info); |
|
mutex_unlock(&info->port.mutex); |
|
|
|
tty_port_close_end(&info->port, tty); |
|
info->port.tty = NULL; |
|
cleanup: |
|
DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count)); |
|
} |
|
|
|
static void hangup(struct tty_struct *tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "hangup")) |
|
return; |
|
DBGINFO(("%s hangup\n", info->device_name)); |
|
|
|
flush_buffer(tty); |
|
|
|
mutex_lock(&info->port.mutex); |
|
shutdown(info); |
|
|
|
spin_lock_irqsave(&info->port.lock, flags); |
|
info->port.count = 0; |
|
info->port.tty = NULL; |
|
spin_unlock_irqrestore(&info->port.lock, flags); |
|
tty_port_set_active(&info->port, 0); |
|
mutex_unlock(&info->port.mutex); |
|
|
|
wake_up_interruptible(&info->port.open_wait); |
|
} |
|
|
|
static void set_termios(struct tty_struct *tty, struct ktermios *old_termios) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
DBGINFO(("%s set_termios\n", tty->driver->name)); |
|
|
|
change_params(info); |
|
|
|
/* Handle transition to B0 status */ |
|
if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) { |
|
info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); |
|
spin_lock_irqsave(&info->lock,flags); |
|
set_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
|
|
/* Handle transition away from B0 status */ |
|
if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) { |
|
info->signals |= SerialSignal_DTR; |
|
if (!C_CRTSCTS(tty) || !tty_throttled(tty)) |
|
info->signals |= SerialSignal_RTS; |
|
spin_lock_irqsave(&info->lock,flags); |
|
set_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
|
|
/* Handle turning off CRTSCTS */ |
|
if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { |
|
tty->hw_stopped = 0; |
|
tx_release(tty); |
|
} |
|
} |
|
|
|
static void update_tx_timer(struct slgt_info *info) |
|
{ |
|
/* |
|
* use worst case speed of 1200bps to calculate transmit timeout |
|
* based on data in buffers (tbuf_bytes) and FIFO (128 bytes) |
|
*/ |
|
if (info->params.mode == MGSL_MODE_HDLC) { |
|
int timeout = (tbuf_bytes(info) * 7) + 1000; |
|
mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout)); |
|
} |
|
} |
|
|
|
static int write(struct tty_struct *tty, |
|
const unsigned char *buf, int count) |
|
{ |
|
int ret = 0; |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "write")) |
|
return -EIO; |
|
|
|
DBGINFO(("%s write count=%d\n", info->device_name, count)); |
|
|
|
if (!info->tx_buf || (count > info->max_frame_size)) |
|
return -EIO; |
|
|
|
if (!count || tty->flow.stopped || tty->hw_stopped) |
|
return 0; |
|
|
|
spin_lock_irqsave(&info->lock, flags); |
|
|
|
if (info->tx_count) { |
|
/* send accumulated data from send_char() */ |
|
if (!tx_load(info, info->tx_buf, info->tx_count)) |
|
goto cleanup; |
|
info->tx_count = 0; |
|
} |
|
|
|
if (tx_load(info, buf, count)) |
|
ret = count; |
|
|
|
cleanup: |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
DBGINFO(("%s write rc=%d\n", info->device_name, ret)); |
|
return ret; |
|
} |
|
|
|
static int put_char(struct tty_struct *tty, unsigned char ch) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
int ret = 0; |
|
|
|
if (sanity_check(info, tty->name, "put_char")) |
|
return 0; |
|
DBGINFO(("%s put_char(%d)\n", info->device_name, ch)); |
|
if (!info->tx_buf) |
|
return 0; |
|
spin_lock_irqsave(&info->lock,flags); |
|
if (info->tx_count < info->max_frame_size) { |
|
info->tx_buf[info->tx_count++] = ch; |
|
ret = 1; |
|
} |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
return ret; |
|
} |
|
|
|
static void send_xchar(struct tty_struct *tty, char ch) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "send_xchar")) |
|
return; |
|
DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch)); |
|
info->x_char = ch; |
|
if (ch) { |
|
spin_lock_irqsave(&info->lock,flags); |
|
if (!info->tx_enabled) |
|
tx_start(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
} |
|
|
|
static void wait_until_sent(struct tty_struct *tty, int timeout) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long orig_jiffies, char_time; |
|
|
|
if (!info ) |
|
return; |
|
if (sanity_check(info, tty->name, "wait_until_sent")) |
|
return; |
|
DBGINFO(("%s wait_until_sent entry\n", info->device_name)); |
|
if (!tty_port_initialized(&info->port)) |
|
goto exit; |
|
|
|
orig_jiffies = jiffies; |
|
|
|
/* Set check interval to 1/5 of estimated time to |
|
* send a character, and make it at least 1. The check |
|
* interval should also be less than the timeout. |
|
* Note: use tight timings here to satisfy the NIST-PCTS. |
|
*/ |
|
|
|
if (info->params.data_rate) { |
|
char_time = info->timeout/(32 * 5); |
|
if (!char_time) |
|
char_time++; |
|
} else |
|
char_time = 1; |
|
|
|
if (timeout) |
|
char_time = min_t(unsigned long, char_time, timeout); |
|
|
|
while (info->tx_active) { |
|
msleep_interruptible(jiffies_to_msecs(char_time)); |
|
if (signal_pending(current)) |
|
break; |
|
if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
|
break; |
|
} |
|
exit: |
|
DBGINFO(("%s wait_until_sent exit\n", info->device_name)); |
|
} |
|
|
|
static unsigned int write_room(struct tty_struct *tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned int ret; |
|
|
|
if (sanity_check(info, tty->name, "write_room")) |
|
return 0; |
|
ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE; |
|
DBGINFO(("%s write_room=%u\n", info->device_name, ret)); |
|
return ret; |
|
} |
|
|
|
static void flush_chars(struct tty_struct *tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "flush_chars")) |
|
return; |
|
DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count)); |
|
|
|
if (info->tx_count <= 0 || tty->flow.stopped || |
|
tty->hw_stopped || !info->tx_buf) |
|
return; |
|
|
|
DBGINFO(("%s flush_chars start transmit\n", info->device_name)); |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count)) |
|
info->tx_count = 0; |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
|
|
static void flush_buffer(struct tty_struct *tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "flush_buffer")) |
|
return; |
|
DBGINFO(("%s flush_buffer\n", info->device_name)); |
|
|
|
spin_lock_irqsave(&info->lock, flags); |
|
info->tx_count = 0; |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
|
|
tty_wakeup(tty); |
|
} |
|
|
|
/* |
|
* throttle (stop) transmitter |
|
*/ |
|
static void tx_hold(struct tty_struct *tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "tx_hold")) |
|
return; |
|
DBGINFO(("%s tx_hold\n", info->device_name)); |
|
spin_lock_irqsave(&info->lock,flags); |
|
if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC) |
|
tx_stop(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
|
|
/* |
|
* release (start) transmitter |
|
*/ |
|
static void tx_release(struct tty_struct *tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "tx_release")) |
|
return; |
|
DBGINFO(("%s tx_release\n", info->device_name)); |
|
spin_lock_irqsave(&info->lock, flags); |
|
if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count)) |
|
info->tx_count = 0; |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
} |
|
|
|
/* |
|
* Service an IOCTL request |
|
* |
|
* Arguments |
|
* |
|
* tty pointer to tty instance data |
|
* cmd IOCTL command code |
|
* arg command argument/context |
|
* |
|
* Return 0 if success, otherwise error code |
|
*/ |
|
static int ioctl(struct tty_struct *tty, |
|
unsigned int cmd, unsigned long arg) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
void __user *argp = (void __user *)arg; |
|
int ret; |
|
|
|
if (sanity_check(info, tty->name, "ioctl")) |
|
return -ENODEV; |
|
DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd)); |
|
|
|
if (cmd != TIOCMIWAIT) { |
|
if (tty_io_error(tty)) |
|
return -EIO; |
|
} |
|
|
|
switch (cmd) { |
|
case MGSL_IOCWAITEVENT: |
|
return wait_mgsl_event(info, argp); |
|
case TIOCMIWAIT: |
|
return modem_input_wait(info,(int)arg); |
|
case MGSL_IOCSGPIO: |
|
return set_gpio(info, argp); |
|
case MGSL_IOCGGPIO: |
|
return get_gpio(info, argp); |
|
case MGSL_IOCWAITGPIO: |
|
return wait_gpio(info, argp); |
|
case MGSL_IOCGXSYNC: |
|
return get_xsync(info, argp); |
|
case MGSL_IOCSXSYNC: |
|
return set_xsync(info, (int)arg); |
|
case MGSL_IOCGXCTRL: |
|
return get_xctrl(info, argp); |
|
case MGSL_IOCSXCTRL: |
|
return set_xctrl(info, (int)arg); |
|
} |
|
mutex_lock(&info->port.mutex); |
|
switch (cmd) { |
|
case MGSL_IOCGPARAMS: |
|
ret = get_params(info, argp); |
|
break; |
|
case MGSL_IOCSPARAMS: |
|
ret = set_params(info, argp); |
|
break; |
|
case MGSL_IOCGTXIDLE: |
|
ret = get_txidle(info, argp); |
|
break; |
|
case MGSL_IOCSTXIDLE: |
|
ret = set_txidle(info, (int)arg); |
|
break; |
|
case MGSL_IOCTXENABLE: |
|
ret = tx_enable(info, (int)arg); |
|
break; |
|
case MGSL_IOCRXENABLE: |
|
ret = rx_enable(info, (int)arg); |
|
break; |
|
case MGSL_IOCTXABORT: |
|
ret = tx_abort(info); |
|
break; |
|
case MGSL_IOCGSTATS: |
|
ret = get_stats(info, argp); |
|
break; |
|
case MGSL_IOCGIF: |
|
ret = get_interface(info, argp); |
|
break; |
|
case MGSL_IOCSIF: |
|
ret = set_interface(info,(int)arg); |
|
break; |
|
default: |
|
ret = -ENOIOCTLCMD; |
|
} |
|
mutex_unlock(&info->port.mutex); |
|
return ret; |
|
} |
|
|
|
static int get_icount(struct tty_struct *tty, |
|
struct serial_icounter_struct *icount) |
|
|
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
struct mgsl_icount cnow; /* kernel counter temps */ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
cnow = info->icount; |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
icount->cts = cnow.cts; |
|
icount->dsr = cnow.dsr; |
|
icount->rng = cnow.rng; |
|
icount->dcd = cnow.dcd; |
|
icount->rx = cnow.rx; |
|
icount->tx = cnow.tx; |
|
icount->frame = cnow.frame; |
|
icount->overrun = cnow.overrun; |
|
icount->parity = cnow.parity; |
|
icount->brk = cnow.brk; |
|
icount->buf_overrun = cnow.buf_overrun; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* support for 32 bit ioctl calls on 64 bit systems |
|
*/ |
|
#ifdef CONFIG_COMPAT |
|
static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params) |
|
{ |
|
struct MGSL_PARAMS32 tmp_params; |
|
|
|
DBGINFO(("%s get_params32\n", info->device_name)); |
|
memset(&tmp_params, 0, sizeof(tmp_params)); |
|
tmp_params.mode = (compat_ulong_t)info->params.mode; |
|
tmp_params.loopback = info->params.loopback; |
|
tmp_params.flags = info->params.flags; |
|
tmp_params.encoding = info->params.encoding; |
|
tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed; |
|
tmp_params.addr_filter = info->params.addr_filter; |
|
tmp_params.crc_type = info->params.crc_type; |
|
tmp_params.preamble_length = info->params.preamble_length; |
|
tmp_params.preamble = info->params.preamble; |
|
tmp_params.data_rate = (compat_ulong_t)info->params.data_rate; |
|
tmp_params.data_bits = info->params.data_bits; |
|
tmp_params.stop_bits = info->params.stop_bits; |
|
tmp_params.parity = info->params.parity; |
|
if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32))) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params) |
|
{ |
|
struct MGSL_PARAMS32 tmp_params; |
|
|
|
DBGINFO(("%s set_params32\n", info->device_name)); |
|
if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32))) |
|
return -EFAULT; |
|
|
|
spin_lock(&info->lock); |
|
if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) { |
|
info->base_clock = tmp_params.clock_speed; |
|
} else { |
|
info->params.mode = tmp_params.mode; |
|
info->params.loopback = tmp_params.loopback; |
|
info->params.flags = tmp_params.flags; |
|
info->params.encoding = tmp_params.encoding; |
|
info->params.clock_speed = tmp_params.clock_speed; |
|
info->params.addr_filter = tmp_params.addr_filter; |
|
info->params.crc_type = tmp_params.crc_type; |
|
info->params.preamble_length = tmp_params.preamble_length; |
|
info->params.preamble = tmp_params.preamble; |
|
info->params.data_rate = tmp_params.data_rate; |
|
info->params.data_bits = tmp_params.data_bits; |
|
info->params.stop_bits = tmp_params.stop_bits; |
|
info->params.parity = tmp_params.parity; |
|
} |
|
spin_unlock(&info->lock); |
|
|
|
program_hw(info); |
|
|
|
return 0; |
|
} |
|
|
|
static long slgt_compat_ioctl(struct tty_struct *tty, |
|
unsigned int cmd, unsigned long arg) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
int rc; |
|
|
|
if (sanity_check(info, tty->name, "compat_ioctl")) |
|
return -ENODEV; |
|
DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd)); |
|
|
|
switch (cmd) { |
|
case MGSL_IOCSPARAMS32: |
|
rc = set_params32(info, compat_ptr(arg)); |
|
break; |
|
|
|
case MGSL_IOCGPARAMS32: |
|
rc = get_params32(info, compat_ptr(arg)); |
|
break; |
|
|
|
case MGSL_IOCGPARAMS: |
|
case MGSL_IOCSPARAMS: |
|
case MGSL_IOCGTXIDLE: |
|
case MGSL_IOCGSTATS: |
|
case MGSL_IOCWAITEVENT: |
|
case MGSL_IOCGIF: |
|
case MGSL_IOCSGPIO: |
|
case MGSL_IOCGGPIO: |
|
case MGSL_IOCWAITGPIO: |
|
case MGSL_IOCGXSYNC: |
|
case MGSL_IOCGXCTRL: |
|
rc = ioctl(tty, cmd, (unsigned long)compat_ptr(arg)); |
|
break; |
|
default: |
|
rc = ioctl(tty, cmd, arg); |
|
} |
|
DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc)); |
|
return rc; |
|
} |
|
#else |
|
#define slgt_compat_ioctl NULL |
|
#endif /* ifdef CONFIG_COMPAT */ |
|
|
|
/* |
|
* proc fs support |
|
*/ |
|
static inline void line_info(struct seq_file *m, struct slgt_info *info) |
|
{ |
|
char stat_buf[30]; |
|
unsigned long flags; |
|
|
|
seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n", |
|
info->device_name, info->phys_reg_addr, |
|
info->irq_level, info->max_frame_size); |
|
|
|
/* output current serial signal states */ |
|
spin_lock_irqsave(&info->lock,flags); |
|
get_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
stat_buf[0] = 0; |
|
stat_buf[1] = 0; |
|
if (info->signals & SerialSignal_RTS) |
|
strcat(stat_buf, "|RTS"); |
|
if (info->signals & SerialSignal_CTS) |
|
strcat(stat_buf, "|CTS"); |
|
if (info->signals & SerialSignal_DTR) |
|
strcat(stat_buf, "|DTR"); |
|
if (info->signals & SerialSignal_DSR) |
|
strcat(stat_buf, "|DSR"); |
|
if (info->signals & SerialSignal_DCD) |
|
strcat(stat_buf, "|CD"); |
|
if (info->signals & SerialSignal_RI) |
|
strcat(stat_buf, "|RI"); |
|
|
|
if (info->params.mode != MGSL_MODE_ASYNC) { |
|
seq_printf(m, "\tHDLC txok:%d rxok:%d", |
|
info->icount.txok, info->icount.rxok); |
|
if (info->icount.txunder) |
|
seq_printf(m, " txunder:%d", info->icount.txunder); |
|
if (info->icount.txabort) |
|
seq_printf(m, " txabort:%d", info->icount.txabort); |
|
if (info->icount.rxshort) |
|
seq_printf(m, " rxshort:%d", info->icount.rxshort); |
|
if (info->icount.rxlong) |
|
seq_printf(m, " rxlong:%d", info->icount.rxlong); |
|
if (info->icount.rxover) |
|
seq_printf(m, " rxover:%d", info->icount.rxover); |
|
if (info->icount.rxcrc) |
|
seq_printf(m, " rxcrc:%d", info->icount.rxcrc); |
|
} else { |
|
seq_printf(m, "\tASYNC tx:%d rx:%d", |
|
info->icount.tx, info->icount.rx); |
|
if (info->icount.frame) |
|
seq_printf(m, " fe:%d", info->icount.frame); |
|
if (info->icount.parity) |
|
seq_printf(m, " pe:%d", info->icount.parity); |
|
if (info->icount.brk) |
|
seq_printf(m, " brk:%d", info->icount.brk); |
|
if (info->icount.overrun) |
|
seq_printf(m, " oe:%d", info->icount.overrun); |
|
} |
|
|
|
/* Append serial signal status to end */ |
|
seq_printf(m, " %s\n", stat_buf+1); |
|
|
|
seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n", |
|
info->tx_active,info->bh_requested,info->bh_running, |
|
info->pending_bh); |
|
} |
|
|
|
/* Called to print information about devices |
|
*/ |
|
static int synclink_gt_proc_show(struct seq_file *m, void *v) |
|
{ |
|
struct slgt_info *info; |
|
|
|
seq_puts(m, "synclink_gt driver\n"); |
|
|
|
info = slgt_device_list; |
|
while( info ) { |
|
line_info(m, info); |
|
info = info->next_device; |
|
} |
|
return 0; |
|
} |
|
|
|
/* |
|
* return count of bytes in transmit buffer |
|
*/ |
|
static unsigned int chars_in_buffer(struct tty_struct *tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned int count; |
|
if (sanity_check(info, tty->name, "chars_in_buffer")) |
|
return 0; |
|
count = tbuf_bytes(info); |
|
DBGINFO(("%s chars_in_buffer()=%u\n", info->device_name, count)); |
|
return count; |
|
} |
|
|
|
/* |
|
* signal remote device to throttle send data (our receive data) |
|
*/ |
|
static void throttle(struct tty_struct * tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "throttle")) |
|
return; |
|
DBGINFO(("%s throttle\n", info->device_name)); |
|
if (I_IXOFF(tty)) |
|
send_xchar(tty, STOP_CHAR(tty)); |
|
if (C_CRTSCTS(tty)) { |
|
spin_lock_irqsave(&info->lock,flags); |
|
info->signals &= ~SerialSignal_RTS; |
|
set_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
} |
|
|
|
/* |
|
* signal remote device to stop throttling send data (our receive data) |
|
*/ |
|
static void unthrottle(struct tty_struct * tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "unthrottle")) |
|
return; |
|
DBGINFO(("%s unthrottle\n", info->device_name)); |
|
if (I_IXOFF(tty)) { |
|
if (info->x_char) |
|
info->x_char = 0; |
|
else |
|
send_xchar(tty, START_CHAR(tty)); |
|
} |
|
if (C_CRTSCTS(tty)) { |
|
spin_lock_irqsave(&info->lock,flags); |
|
info->signals |= SerialSignal_RTS; |
|
set_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
} |
|
|
|
/* |
|
* set or clear transmit break condition |
|
* break_state -1=set break condition, 0=clear |
|
*/ |
|
static int set_break(struct tty_struct *tty, int break_state) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned short value; |
|
unsigned long flags; |
|
|
|
if (sanity_check(info, tty->name, "set_break")) |
|
return -EINVAL; |
|
DBGINFO(("%s set_break(%d)\n", info->device_name, break_state)); |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
value = rd_reg16(info, TCR); |
|
if (break_state == -1) |
|
value |= BIT6; |
|
else |
|
value &= ~BIT6; |
|
wr_reg16(info, TCR, value); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
return 0; |
|
} |
|
|
|
#if SYNCLINK_GENERIC_HDLC |
|
|
|
/** |
|
* hdlcdev_attach - called by generic HDLC layer when protocol selected (PPP, frame relay, etc.) |
|
* @dev: pointer to network device structure |
|
* @encoding: serial encoding setting |
|
* @parity: FCS setting |
|
* |
|
* Set encoding and frame check sequence (FCS) options. |
|
* |
|
* Return: 0 if success, otherwise error code |
|
*/ |
|
static int hdlcdev_attach(struct net_device *dev, unsigned short encoding, |
|
unsigned short parity) |
|
{ |
|
struct slgt_info *info = dev_to_port(dev); |
|
unsigned char new_encoding; |
|
unsigned short new_crctype; |
|
|
|
/* return error if TTY interface open */ |
|
if (info->port.count) |
|
return -EBUSY; |
|
|
|
DBGINFO(("%s hdlcdev_attach\n", info->device_name)); |
|
|
|
switch (encoding) |
|
{ |
|
case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break; |
|
case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break; |
|
case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break; |
|
case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break; |
|
case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break; |
|
default: return -EINVAL; |
|
} |
|
|
|
switch (parity) |
|
{ |
|
case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break; |
|
case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break; |
|
case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break; |
|
default: return -EINVAL; |
|
} |
|
|
|
info->params.encoding = new_encoding; |
|
info->params.crc_type = new_crctype; |
|
|
|
/* if network interface up, reprogram hardware */ |
|
if (info->netcount) |
|
program_hw(info); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* hdlcdev_xmit - called by generic HDLC layer to send a frame |
|
* @skb: socket buffer containing HDLC frame |
|
* @dev: pointer to network device structure |
|
*/ |
|
static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb, |
|
struct net_device *dev) |
|
{ |
|
struct slgt_info *info = dev_to_port(dev); |
|
unsigned long flags; |
|
|
|
DBGINFO(("%s hdlc_xmit\n", dev->name)); |
|
|
|
if (!skb->len) |
|
return NETDEV_TX_OK; |
|
|
|
/* stop sending until this frame completes */ |
|
netif_stop_queue(dev); |
|
|
|
/* update network statistics */ |
|
dev->stats.tx_packets++; |
|
dev->stats.tx_bytes += skb->len; |
|
|
|
/* save start time for transmit timeout detection */ |
|
netif_trans_update(dev); |
|
|
|
spin_lock_irqsave(&info->lock, flags); |
|
tx_load(info, skb->data, skb->len); |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
|
|
/* done with socket buffer, so free it */ |
|
dev_kfree_skb(skb); |
|
|
|
return NETDEV_TX_OK; |
|
} |
|
|
|
/** |
|
* hdlcdev_open - called by network layer when interface enabled |
|
* @dev: pointer to network device structure |
|
* |
|
* Claim resources and initialize hardware. |
|
* |
|
* Return: 0 if success, otherwise error code |
|
*/ |
|
static int hdlcdev_open(struct net_device *dev) |
|
{ |
|
struct slgt_info *info = dev_to_port(dev); |
|
int rc; |
|
unsigned long flags; |
|
|
|
if (!try_module_get(THIS_MODULE)) |
|
return -EBUSY; |
|
|
|
DBGINFO(("%s hdlcdev_open\n", dev->name)); |
|
|
|
/* generic HDLC layer open processing */ |
|
rc = hdlc_open(dev); |
|
if (rc) |
|
return rc; |
|
|
|
/* arbitrate between network and tty opens */ |
|
spin_lock_irqsave(&info->netlock, flags); |
|
if (info->port.count != 0 || info->netcount != 0) { |
|
DBGINFO(("%s hdlc_open busy\n", dev->name)); |
|
spin_unlock_irqrestore(&info->netlock, flags); |
|
return -EBUSY; |
|
} |
|
info->netcount=1; |
|
spin_unlock_irqrestore(&info->netlock, flags); |
|
|
|
/* claim resources and init adapter */ |
|
if ((rc = startup(info)) != 0) { |
|
spin_lock_irqsave(&info->netlock, flags); |
|
info->netcount=0; |
|
spin_unlock_irqrestore(&info->netlock, flags); |
|
return rc; |
|
} |
|
|
|
/* assert RTS and DTR, apply hardware settings */ |
|
info->signals |= SerialSignal_RTS | SerialSignal_DTR; |
|
program_hw(info); |
|
|
|
/* enable network layer transmit */ |
|
netif_trans_update(dev); |
|
netif_start_queue(dev); |
|
|
|
/* inform generic HDLC layer of current DCD status */ |
|
spin_lock_irqsave(&info->lock, flags); |
|
get_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
if (info->signals & SerialSignal_DCD) |
|
netif_carrier_on(dev); |
|
else |
|
netif_carrier_off(dev); |
|
return 0; |
|
} |
|
|
|
/** |
|
* hdlcdev_close - called by network layer when interface is disabled |
|
* @dev: pointer to network device structure |
|
* |
|
* Shutdown hardware and release resources. |
|
* |
|
* Return: 0 if success, otherwise error code |
|
*/ |
|
static int hdlcdev_close(struct net_device *dev) |
|
{ |
|
struct slgt_info *info = dev_to_port(dev); |
|
unsigned long flags; |
|
|
|
DBGINFO(("%s hdlcdev_close\n", dev->name)); |
|
|
|
netif_stop_queue(dev); |
|
|
|
/* shutdown adapter and release resources */ |
|
shutdown(info); |
|
|
|
hdlc_close(dev); |
|
|
|
spin_lock_irqsave(&info->netlock, flags); |
|
info->netcount=0; |
|
spin_unlock_irqrestore(&info->netlock, flags); |
|
|
|
module_put(THIS_MODULE); |
|
return 0; |
|
} |
|
|
|
/** |
|
* hdlcdev_ioctl - called by network layer to process IOCTL call to network device |
|
* @dev: pointer to network device structure |
|
* @ifr: pointer to network interface request structure |
|
* @cmd: IOCTL command code |
|
* |
|
* Return: 0 if success, otherwise error code |
|
*/ |
|
static int hdlcdev_ioctl(struct net_device *dev, struct if_settings *ifs) |
|
{ |
|
const size_t size = sizeof(sync_serial_settings); |
|
sync_serial_settings new_line; |
|
sync_serial_settings __user *line = ifs->ifs_ifsu.sync; |
|
struct slgt_info *info = dev_to_port(dev); |
|
unsigned int flags; |
|
|
|
DBGINFO(("%s hdlcdev_ioctl\n", dev->name)); |
|
|
|
/* return error if TTY interface open */ |
|
if (info->port.count) |
|
return -EBUSY; |
|
|
|
memset(&new_line, 0, sizeof(new_line)); |
|
|
|
switch (ifs->type) { |
|
case IF_GET_IFACE: /* return current sync_serial_settings */ |
|
|
|
ifs->type = IF_IFACE_SYNC_SERIAL; |
|
if (ifs->size < size) { |
|
ifs->size = size; /* data size wanted */ |
|
return -ENOBUFS; |
|
} |
|
|
|
flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | |
|
HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | |
|
HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | |
|
HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); |
|
|
|
switch (flags){ |
|
case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break; |
|
case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break; |
|
case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break; |
|
case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break; |
|
default: new_line.clock_type = CLOCK_DEFAULT; |
|
} |
|
|
|
new_line.clock_rate = info->params.clock_speed; |
|
new_line.loopback = info->params.loopback ? 1:0; |
|
|
|
if (copy_to_user(line, &new_line, size)) |
|
return -EFAULT; |
|
return 0; |
|
|
|
case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */ |
|
|
|
if(!capable(CAP_NET_ADMIN)) |
|
return -EPERM; |
|
if (copy_from_user(&new_line, line, size)) |
|
return -EFAULT; |
|
|
|
switch (new_line.clock_type) |
|
{ |
|
case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break; |
|
case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break; |
|
case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break; |
|
case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break; |
|
case CLOCK_DEFAULT: flags = info->params.flags & |
|
(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | |
|
HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | |
|
HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | |
|
HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break; |
|
default: return -EINVAL; |
|
} |
|
|
|
if (new_line.loopback != 0 && new_line.loopback != 1) |
|
return -EINVAL; |
|
|
|
info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL | |
|
HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN | |
|
HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL | |
|
HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); |
|
info->params.flags |= flags; |
|
|
|
info->params.loopback = new_line.loopback; |
|
|
|
if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG)) |
|
info->params.clock_speed = new_line.clock_rate; |
|
else |
|
info->params.clock_speed = 0; |
|
|
|
/* if network interface up, reprogram hardware */ |
|
if (info->netcount) |
|
program_hw(info); |
|
return 0; |
|
|
|
default: |
|
return hdlc_ioctl(dev, ifs); |
|
} |
|
} |
|
|
|
/** |
|
* hdlcdev_tx_timeout - called by network layer when transmit timeout is detected |
|
* @dev: pointer to network device structure |
|
* @txqueue: unused |
|
*/ |
|
static void hdlcdev_tx_timeout(struct net_device *dev, unsigned int txqueue) |
|
{ |
|
struct slgt_info *info = dev_to_port(dev); |
|
unsigned long flags; |
|
|
|
DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name)); |
|
|
|
dev->stats.tx_errors++; |
|
dev->stats.tx_aborted_errors++; |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
tx_stop(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
netif_wake_queue(dev); |
|
} |
|
|
|
/** |
|
* hdlcdev_tx_done - called by device driver when transmit completes |
|
* @info: pointer to device instance information |
|
* |
|
* Reenable network layer transmit if stopped. |
|
*/ |
|
static void hdlcdev_tx_done(struct slgt_info *info) |
|
{ |
|
if (netif_queue_stopped(info->netdev)) |
|
netif_wake_queue(info->netdev); |
|
} |
|
|
|
/** |
|
* hdlcdev_rx - called by device driver when frame received |
|
* @info: pointer to device instance information |
|
* @buf: pointer to buffer contianing frame data |
|
* @size: count of data bytes in buf |
|
* |
|
* Pass frame to network layer. |
|
*/ |
|
static void hdlcdev_rx(struct slgt_info *info, char *buf, int size) |
|
{ |
|
struct sk_buff *skb = dev_alloc_skb(size); |
|
struct net_device *dev = info->netdev; |
|
|
|
DBGINFO(("%s hdlcdev_rx\n", dev->name)); |
|
|
|
if (skb == NULL) { |
|
DBGERR(("%s: can't alloc skb, drop packet\n", dev->name)); |
|
dev->stats.rx_dropped++; |
|
return; |
|
} |
|
|
|
skb_put_data(skb, buf, size); |
|
|
|
skb->protocol = hdlc_type_trans(skb, dev); |
|
|
|
dev->stats.rx_packets++; |
|
dev->stats.rx_bytes += size; |
|
|
|
netif_rx(skb); |
|
} |
|
|
|
static const struct net_device_ops hdlcdev_ops = { |
|
.ndo_open = hdlcdev_open, |
|
.ndo_stop = hdlcdev_close, |
|
.ndo_start_xmit = hdlc_start_xmit, |
|
.ndo_siocwandev = hdlcdev_ioctl, |
|
.ndo_tx_timeout = hdlcdev_tx_timeout, |
|
}; |
|
|
|
/** |
|
* hdlcdev_init - called by device driver when adding device instance |
|
* @info: pointer to device instance information |
|
* |
|
* Do generic HDLC initialization. |
|
* |
|
* Return: 0 if success, otherwise error code |
|
*/ |
|
static int hdlcdev_init(struct slgt_info *info) |
|
{ |
|
int rc; |
|
struct net_device *dev; |
|
hdlc_device *hdlc; |
|
|
|
/* allocate and initialize network and HDLC layer objects */ |
|
|
|
dev = alloc_hdlcdev(info); |
|
if (!dev) { |
|
printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name); |
|
return -ENOMEM; |
|
} |
|
|
|
/* for network layer reporting purposes only */ |
|
dev->mem_start = info->phys_reg_addr; |
|
dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1; |
|
dev->irq = info->irq_level; |
|
|
|
/* network layer callbacks and settings */ |
|
dev->netdev_ops = &hdlcdev_ops; |
|
dev->watchdog_timeo = 10 * HZ; |
|
dev->tx_queue_len = 50; |
|
|
|
/* generic HDLC layer callbacks and settings */ |
|
hdlc = dev_to_hdlc(dev); |
|
hdlc->attach = hdlcdev_attach; |
|
hdlc->xmit = hdlcdev_xmit; |
|
|
|
/* register objects with HDLC layer */ |
|
rc = register_hdlc_device(dev); |
|
if (rc) { |
|
printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__); |
|
free_netdev(dev); |
|
return rc; |
|
} |
|
|
|
info->netdev = dev; |
|
return 0; |
|
} |
|
|
|
/** |
|
* hdlcdev_exit - called by device driver when removing device instance |
|
* @info: pointer to device instance information |
|
* |
|
* Do generic HDLC cleanup. |
|
*/ |
|
static void hdlcdev_exit(struct slgt_info *info) |
|
{ |
|
unregister_hdlc_device(info->netdev); |
|
free_netdev(info->netdev); |
|
info->netdev = NULL; |
|
} |
|
|
|
#endif /* ifdef CONFIG_HDLC */ |
|
|
|
/* |
|
* get async data from rx DMA buffers |
|
*/ |
|
static void rx_async(struct slgt_info *info) |
|
{ |
|
struct mgsl_icount *icount = &info->icount; |
|
unsigned int start, end; |
|
unsigned char *p; |
|
unsigned char status; |
|
struct slgt_desc *bufs = info->rbufs; |
|
int i, count; |
|
int chars = 0; |
|
int stat; |
|
unsigned char ch; |
|
|
|
start = end = info->rbuf_current; |
|
|
|
while(desc_complete(bufs[end])) { |
|
count = desc_count(bufs[end]) - info->rbuf_index; |
|
p = bufs[end].buf + info->rbuf_index; |
|
|
|
DBGISR(("%s rx_async count=%d\n", info->device_name, count)); |
|
DBGDATA(info, p, count, "rx"); |
|
|
|
for(i=0 ; i < count; i+=2, p+=2) { |
|
ch = *p; |
|
icount->rx++; |
|
|
|
stat = 0; |
|
|
|
status = *(p + 1) & (BIT1 + BIT0); |
|
if (status) { |
|
if (status & BIT1) |
|
icount->parity++; |
|
else if (status & BIT0) |
|
icount->frame++; |
|
/* discard char if tty control flags say so */ |
|
if (status & info->ignore_status_mask) |
|
continue; |
|
if (status & BIT1) |
|
stat = TTY_PARITY; |
|
else if (status & BIT0) |
|
stat = TTY_FRAME; |
|
} |
|
tty_insert_flip_char(&info->port, ch, stat); |
|
chars++; |
|
} |
|
|
|
if (i < count) { |
|
/* receive buffer not completed */ |
|
info->rbuf_index += i; |
|
mod_timer(&info->rx_timer, jiffies + 1); |
|
break; |
|
} |
|
|
|
info->rbuf_index = 0; |
|
free_rbufs(info, end, end); |
|
|
|
if (++end == info->rbuf_count) |
|
end = 0; |
|
|
|
/* if entire list searched then no frame available */ |
|
if (end == start) |
|
break; |
|
} |
|
|
|
if (chars) |
|
tty_flip_buffer_push(&info->port); |
|
} |
|
|
|
/* |
|
* return next bottom half action to perform |
|
*/ |
|
static int bh_action(struct slgt_info *info) |
|
{ |
|
unsigned long flags; |
|
int rc; |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
|
|
if (info->pending_bh & BH_RECEIVE) { |
|
info->pending_bh &= ~BH_RECEIVE; |
|
rc = BH_RECEIVE; |
|
} else if (info->pending_bh & BH_TRANSMIT) { |
|
info->pending_bh &= ~BH_TRANSMIT; |
|
rc = BH_TRANSMIT; |
|
} else if (info->pending_bh & BH_STATUS) { |
|
info->pending_bh &= ~BH_STATUS; |
|
rc = BH_STATUS; |
|
} else { |
|
/* Mark BH routine as complete */ |
|
info->bh_running = false; |
|
info->bh_requested = false; |
|
rc = 0; |
|
} |
|
|
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
return rc; |
|
} |
|
|
|
/* |
|
* perform bottom half processing |
|
*/ |
|
static void bh_handler(struct work_struct *work) |
|
{ |
|
struct slgt_info *info = container_of(work, struct slgt_info, task); |
|
int action; |
|
|
|
info->bh_running = true; |
|
|
|
while((action = bh_action(info))) { |
|
switch (action) { |
|
case BH_RECEIVE: |
|
DBGBH(("%s bh receive\n", info->device_name)); |
|
switch(info->params.mode) { |
|
case MGSL_MODE_ASYNC: |
|
rx_async(info); |
|
break; |
|
case MGSL_MODE_HDLC: |
|
while(rx_get_frame(info)); |
|
break; |
|
case MGSL_MODE_RAW: |
|
case MGSL_MODE_MONOSYNC: |
|
case MGSL_MODE_BISYNC: |
|
case MGSL_MODE_XSYNC: |
|
while(rx_get_buf(info)); |
|
break; |
|
} |
|
/* restart receiver if rx DMA buffers exhausted */ |
|
if (info->rx_restart) |
|
rx_start(info); |
|
break; |
|
case BH_TRANSMIT: |
|
bh_transmit(info); |
|
break; |
|
case BH_STATUS: |
|
DBGBH(("%s bh status\n", info->device_name)); |
|
info->ri_chkcount = 0; |
|
info->dsr_chkcount = 0; |
|
info->dcd_chkcount = 0; |
|
info->cts_chkcount = 0; |
|
break; |
|
default: |
|
DBGBH(("%s unknown action\n", info->device_name)); |
|
break; |
|
} |
|
} |
|
DBGBH(("%s bh_handler exit\n", info->device_name)); |
|
} |
|
|
|
static void bh_transmit(struct slgt_info *info) |
|
{ |
|
struct tty_struct *tty = info->port.tty; |
|
|
|
DBGBH(("%s bh_transmit\n", info->device_name)); |
|
if (tty) |
|
tty_wakeup(tty); |
|
} |
|
|
|
static void dsr_change(struct slgt_info *info, unsigned short status) |
|
{ |
|
if (status & BIT3) { |
|
info->signals |= SerialSignal_DSR; |
|
info->input_signal_events.dsr_up++; |
|
} else { |
|
info->signals &= ~SerialSignal_DSR; |
|
info->input_signal_events.dsr_down++; |
|
} |
|
DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals)); |
|
if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { |
|
slgt_irq_off(info, IRQ_DSR); |
|
return; |
|
} |
|
info->icount.dsr++; |
|
wake_up_interruptible(&info->status_event_wait_q); |
|
wake_up_interruptible(&info->event_wait_q); |
|
info->pending_bh |= BH_STATUS; |
|
} |
|
|
|
static void cts_change(struct slgt_info *info, unsigned short status) |
|
{ |
|
if (status & BIT2) { |
|
info->signals |= SerialSignal_CTS; |
|
info->input_signal_events.cts_up++; |
|
} else { |
|
info->signals &= ~SerialSignal_CTS; |
|
info->input_signal_events.cts_down++; |
|
} |
|
DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals)); |
|
if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { |
|
slgt_irq_off(info, IRQ_CTS); |
|
return; |
|
} |
|
info->icount.cts++; |
|
wake_up_interruptible(&info->status_event_wait_q); |
|
wake_up_interruptible(&info->event_wait_q); |
|
info->pending_bh |= BH_STATUS; |
|
|
|
if (tty_port_cts_enabled(&info->port)) { |
|
if (info->port.tty) { |
|
if (info->port.tty->hw_stopped) { |
|
if (info->signals & SerialSignal_CTS) { |
|
info->port.tty->hw_stopped = 0; |
|
info->pending_bh |= BH_TRANSMIT; |
|
return; |
|
} |
|
} else { |
|
if (!(info->signals & SerialSignal_CTS)) |
|
info->port.tty->hw_stopped = 1; |
|
} |
|
} |
|
} |
|
} |
|
|
|
static void dcd_change(struct slgt_info *info, unsigned short status) |
|
{ |
|
if (status & BIT1) { |
|
info->signals |= SerialSignal_DCD; |
|
info->input_signal_events.dcd_up++; |
|
} else { |
|
info->signals &= ~SerialSignal_DCD; |
|
info->input_signal_events.dcd_down++; |
|
} |
|
DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals)); |
|
if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { |
|
slgt_irq_off(info, IRQ_DCD); |
|
return; |
|
} |
|
info->icount.dcd++; |
|
#if SYNCLINK_GENERIC_HDLC |
|
if (info->netcount) { |
|
if (info->signals & SerialSignal_DCD) |
|
netif_carrier_on(info->netdev); |
|
else |
|
netif_carrier_off(info->netdev); |
|
} |
|
#endif |
|
wake_up_interruptible(&info->status_event_wait_q); |
|
wake_up_interruptible(&info->event_wait_q); |
|
info->pending_bh |= BH_STATUS; |
|
|
|
if (tty_port_check_carrier(&info->port)) { |
|
if (info->signals & SerialSignal_DCD) |
|
wake_up_interruptible(&info->port.open_wait); |
|
else { |
|
if (info->port.tty) |
|
tty_hangup(info->port.tty); |
|
} |
|
} |
|
} |
|
|
|
static void ri_change(struct slgt_info *info, unsigned short status) |
|
{ |
|
if (status & BIT0) { |
|
info->signals |= SerialSignal_RI; |
|
info->input_signal_events.ri_up++; |
|
} else { |
|
info->signals &= ~SerialSignal_RI; |
|
info->input_signal_events.ri_down++; |
|
} |
|
DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals)); |
|
if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) { |
|
slgt_irq_off(info, IRQ_RI); |
|
return; |
|
} |
|
info->icount.rng++; |
|
wake_up_interruptible(&info->status_event_wait_q); |
|
wake_up_interruptible(&info->event_wait_q); |
|
info->pending_bh |= BH_STATUS; |
|
} |
|
|
|
static void isr_rxdata(struct slgt_info *info) |
|
{ |
|
unsigned int count = info->rbuf_fill_count; |
|
unsigned int i = info->rbuf_fill_index; |
|
unsigned short reg; |
|
|
|
while (rd_reg16(info, SSR) & IRQ_RXDATA) { |
|
reg = rd_reg16(info, RDR); |
|
DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg)); |
|
if (desc_complete(info->rbufs[i])) { |
|
/* all buffers full */ |
|
rx_stop(info); |
|
info->rx_restart = true; |
|
continue; |
|
} |
|
info->rbufs[i].buf[count++] = (unsigned char)reg; |
|
/* async mode saves status byte to buffer for each data byte */ |
|
if (info->params.mode == MGSL_MODE_ASYNC) |
|
info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8); |
|
if (count == info->rbuf_fill_level || (reg & BIT10)) { |
|
/* buffer full or end of frame */ |
|
set_desc_count(info->rbufs[i], count); |
|
set_desc_status(info->rbufs[i], BIT15 | (reg >> 8)); |
|
info->rbuf_fill_count = count = 0; |
|
if (++i == info->rbuf_count) |
|
i = 0; |
|
info->pending_bh |= BH_RECEIVE; |
|
} |
|
} |
|
|
|
info->rbuf_fill_index = i; |
|
info->rbuf_fill_count = count; |
|
} |
|
|
|
static void isr_serial(struct slgt_info *info) |
|
{ |
|
unsigned short status = rd_reg16(info, SSR); |
|
|
|
DBGISR(("%s isr_serial status=%04X\n", info->device_name, status)); |
|
|
|
wr_reg16(info, SSR, status); /* clear pending */ |
|
|
|
info->irq_occurred = true; |
|
|
|
if (info->params.mode == MGSL_MODE_ASYNC) { |
|
if (status & IRQ_TXIDLE) { |
|
if (info->tx_active) |
|
isr_txeom(info, status); |
|
} |
|
if (info->rx_pio && (status & IRQ_RXDATA)) |
|
isr_rxdata(info); |
|
if ((status & IRQ_RXBREAK) && (status & RXBREAK)) { |
|
info->icount.brk++; |
|
/* process break detection if tty control allows */ |
|
if (info->port.tty) { |
|
if (!(status & info->ignore_status_mask)) { |
|
if (info->read_status_mask & MASK_BREAK) { |
|
tty_insert_flip_char(&info->port, 0, TTY_BREAK); |
|
if (info->port.flags & ASYNC_SAK) |
|
do_SAK(info->port.tty); |
|
} |
|
} |
|
} |
|
} |
|
} else { |
|
if (status & (IRQ_TXIDLE + IRQ_TXUNDER)) |
|
isr_txeom(info, status); |
|
if (info->rx_pio && (status & IRQ_RXDATA)) |
|
isr_rxdata(info); |
|
if (status & IRQ_RXIDLE) { |
|
if (status & RXIDLE) |
|
info->icount.rxidle++; |
|
else |
|
info->icount.exithunt++; |
|
wake_up_interruptible(&info->event_wait_q); |
|
} |
|
|
|
if (status & IRQ_RXOVER) |
|
rx_start(info); |
|
} |
|
|
|
if (status & IRQ_DSR) |
|
dsr_change(info, status); |
|
if (status & IRQ_CTS) |
|
cts_change(info, status); |
|
if (status & IRQ_DCD) |
|
dcd_change(info, status); |
|
if (status & IRQ_RI) |
|
ri_change(info, status); |
|
} |
|
|
|
static void isr_rdma(struct slgt_info *info) |
|
{ |
|
unsigned int status = rd_reg32(info, RDCSR); |
|
|
|
DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status)); |
|
|
|
/* RDCSR (rx DMA control/status) |
|
* |
|
* 31..07 reserved |
|
* 06 save status byte to DMA buffer |
|
* 05 error |
|
* 04 eol (end of list) |
|
* 03 eob (end of buffer) |
|
* 02 IRQ enable |
|
* 01 reset |
|
* 00 enable |
|
*/ |
|
wr_reg32(info, RDCSR, status); /* clear pending */ |
|
|
|
if (status & (BIT5 + BIT4)) { |
|
DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name)); |
|
info->rx_restart = true; |
|
} |
|
info->pending_bh |= BH_RECEIVE; |
|
} |
|
|
|
static void isr_tdma(struct slgt_info *info) |
|
{ |
|
unsigned int status = rd_reg32(info, TDCSR); |
|
|
|
DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status)); |
|
|
|
/* TDCSR (tx DMA control/status) |
|
* |
|
* 31..06 reserved |
|
* 05 error |
|
* 04 eol (end of list) |
|
* 03 eob (end of buffer) |
|
* 02 IRQ enable |
|
* 01 reset |
|
* 00 enable |
|
*/ |
|
wr_reg32(info, TDCSR, status); /* clear pending */ |
|
|
|
if (status & (BIT5 + BIT4 + BIT3)) { |
|
// another transmit buffer has completed |
|
// run bottom half to get more send data from user |
|
info->pending_bh |= BH_TRANSMIT; |
|
} |
|
} |
|
|
|
/* |
|
* return true if there are unsent tx DMA buffers, otherwise false |
|
* |
|
* if there are unsent buffers then info->tbuf_start |
|
* is set to index of first unsent buffer |
|
*/ |
|
static bool unsent_tbufs(struct slgt_info *info) |
|
{ |
|
unsigned int i = info->tbuf_current; |
|
bool rc = false; |
|
|
|
/* |
|
* search backwards from last loaded buffer (precedes tbuf_current) |
|
* for first unsent buffer (desc_count > 0) |
|
*/ |
|
|
|
do { |
|
if (i) |
|
i--; |
|
else |
|
i = info->tbuf_count - 1; |
|
if (!desc_count(info->tbufs[i])) |
|
break; |
|
info->tbuf_start = i; |
|
rc = true; |
|
} while (i != info->tbuf_current); |
|
|
|
return rc; |
|
} |
|
|
|
static void isr_txeom(struct slgt_info *info, unsigned short status) |
|
{ |
|
DBGISR(("%s txeom status=%04x\n", info->device_name, status)); |
|
|
|
slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER); |
|
tdma_reset(info); |
|
if (status & IRQ_TXUNDER) { |
|
unsigned short val = rd_reg16(info, TCR); |
|
wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */ |
|
wr_reg16(info, TCR, val); /* clear reset bit */ |
|
} |
|
|
|
if (info->tx_active) { |
|
if (info->params.mode != MGSL_MODE_ASYNC) { |
|
if (status & IRQ_TXUNDER) |
|
info->icount.txunder++; |
|
else if (status & IRQ_TXIDLE) |
|
info->icount.txok++; |
|
} |
|
|
|
if (unsent_tbufs(info)) { |
|
tx_start(info); |
|
update_tx_timer(info); |
|
return; |
|
} |
|
info->tx_active = false; |
|
|
|
del_timer(&info->tx_timer); |
|
|
|
if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) { |
|
info->signals &= ~SerialSignal_RTS; |
|
info->drop_rts_on_tx_done = false; |
|
set_gtsignals(info); |
|
} |
|
|
|
#if SYNCLINK_GENERIC_HDLC |
|
if (info->netcount) |
|
hdlcdev_tx_done(info); |
|
else |
|
#endif |
|
{ |
|
if (info->port.tty && (info->port.tty->flow.stopped || info->port.tty->hw_stopped)) { |
|
tx_stop(info); |
|
return; |
|
} |
|
info->pending_bh |= BH_TRANSMIT; |
|
} |
|
} |
|
} |
|
|
|
static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state) |
|
{ |
|
struct cond_wait *w, *prev; |
|
|
|
/* wake processes waiting for specific transitions */ |
|
for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) { |
|
if (w->data & changed) { |
|
w->data = state; |
|
wake_up_interruptible(&w->q); |
|
if (prev != NULL) |
|
prev->next = w->next; |
|
else |
|
info->gpio_wait_q = w->next; |
|
} else |
|
prev = w; |
|
} |
|
} |
|
|
|
/* interrupt service routine |
|
* |
|
* irq interrupt number |
|
* dev_id device ID supplied during interrupt registration |
|
*/ |
|
static irqreturn_t slgt_interrupt(int dummy, void *dev_id) |
|
{ |
|
struct slgt_info *info = dev_id; |
|
unsigned int gsr; |
|
unsigned int i; |
|
|
|
DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level)); |
|
|
|
while((gsr = rd_reg32(info, GSR) & 0xffffff00)) { |
|
DBGISR(("%s gsr=%08x\n", info->device_name, gsr)); |
|
info->irq_occurred = true; |
|
for(i=0; i < info->port_count ; i++) { |
|
if (info->port_array[i] == NULL) |
|
continue; |
|
spin_lock(&info->port_array[i]->lock); |
|
if (gsr & (BIT8 << i)) |
|
isr_serial(info->port_array[i]); |
|
if (gsr & (BIT16 << (i*2))) |
|
isr_rdma(info->port_array[i]); |
|
if (gsr & (BIT17 << (i*2))) |
|
isr_tdma(info->port_array[i]); |
|
spin_unlock(&info->port_array[i]->lock); |
|
} |
|
} |
|
|
|
if (info->gpio_present) { |
|
unsigned int state; |
|
unsigned int changed; |
|
spin_lock(&info->lock); |
|
while ((changed = rd_reg32(info, IOSR)) != 0) { |
|
DBGISR(("%s iosr=%08x\n", info->device_name, changed)); |
|
/* read latched state of GPIO signals */ |
|
state = rd_reg32(info, IOVR); |
|
/* clear pending GPIO interrupt bits */ |
|
wr_reg32(info, IOSR, changed); |
|
for (i=0 ; i < info->port_count ; i++) { |
|
if (info->port_array[i] != NULL) |
|
isr_gpio(info->port_array[i], changed, state); |
|
} |
|
} |
|
spin_unlock(&info->lock); |
|
} |
|
|
|
for(i=0; i < info->port_count ; i++) { |
|
struct slgt_info *port = info->port_array[i]; |
|
if (port == NULL) |
|
continue; |
|
spin_lock(&port->lock); |
|
if ((port->port.count || port->netcount) && |
|
port->pending_bh && !port->bh_running && |
|
!port->bh_requested) { |
|
DBGISR(("%s bh queued\n", port->device_name)); |
|
schedule_work(&port->task); |
|
port->bh_requested = true; |
|
} |
|
spin_unlock(&port->lock); |
|
} |
|
|
|
DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level)); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int startup(struct slgt_info *info) |
|
{ |
|
DBGINFO(("%s startup\n", info->device_name)); |
|
|
|
if (tty_port_initialized(&info->port)) |
|
return 0; |
|
|
|
if (!info->tx_buf) { |
|
info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL); |
|
if (!info->tx_buf) { |
|
DBGERR(("%s can't allocate tx buffer\n", info->device_name)); |
|
return -ENOMEM; |
|
} |
|
} |
|
|
|
info->pending_bh = 0; |
|
|
|
memset(&info->icount, 0, sizeof(info->icount)); |
|
|
|
/* program hardware for current parameters */ |
|
change_params(info); |
|
|
|
if (info->port.tty) |
|
clear_bit(TTY_IO_ERROR, &info->port.tty->flags); |
|
|
|
tty_port_set_initialized(&info->port, 1); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* called by close() and hangup() to shutdown hardware |
|
*/ |
|
static void shutdown(struct slgt_info *info) |
|
{ |
|
unsigned long flags; |
|
|
|
if (!tty_port_initialized(&info->port)) |
|
return; |
|
|
|
DBGINFO(("%s shutdown\n", info->device_name)); |
|
|
|
/* clear status wait queue because status changes */ |
|
/* can't happen after shutting down the hardware */ |
|
wake_up_interruptible(&info->status_event_wait_q); |
|
wake_up_interruptible(&info->event_wait_q); |
|
|
|
del_timer_sync(&info->tx_timer); |
|
del_timer_sync(&info->rx_timer); |
|
|
|
kfree(info->tx_buf); |
|
info->tx_buf = NULL; |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
|
|
tx_stop(info); |
|
rx_stop(info); |
|
|
|
slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); |
|
|
|
if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) { |
|
info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); |
|
set_gtsignals(info); |
|
} |
|
|
|
flush_cond_wait(&info->gpio_wait_q); |
|
|
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
if (info->port.tty) |
|
set_bit(TTY_IO_ERROR, &info->port.tty->flags); |
|
|
|
tty_port_set_initialized(&info->port, 0); |
|
} |
|
|
|
static void program_hw(struct slgt_info *info) |
|
{ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
|
|
rx_stop(info); |
|
tx_stop(info); |
|
|
|
if (info->params.mode != MGSL_MODE_ASYNC || |
|
info->netcount) |
|
sync_mode(info); |
|
else |
|
async_mode(info); |
|
|
|
set_gtsignals(info); |
|
|
|
info->dcd_chkcount = 0; |
|
info->cts_chkcount = 0; |
|
info->ri_chkcount = 0; |
|
info->dsr_chkcount = 0; |
|
|
|
slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI); |
|
get_gtsignals(info); |
|
|
|
if (info->netcount || |
|
(info->port.tty && info->port.tty->termios.c_cflag & CREAD)) |
|
rx_start(info); |
|
|
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
|
|
/* |
|
* reconfigure adapter based on new parameters |
|
*/ |
|
static void change_params(struct slgt_info *info) |
|
{ |
|
unsigned cflag; |
|
int bits_per_char; |
|
|
|
if (!info->port.tty) |
|
return; |
|
DBGINFO(("%s change_params\n", info->device_name)); |
|
|
|
cflag = info->port.tty->termios.c_cflag; |
|
|
|
/* if B0 rate (hangup) specified then negate RTS and DTR */ |
|
/* otherwise assert RTS and DTR */ |
|
if (cflag & CBAUD) |
|
info->signals |= SerialSignal_RTS | SerialSignal_DTR; |
|
else |
|
info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); |
|
|
|
/* byte size and parity */ |
|
|
|
info->params.data_bits = tty_get_char_size(cflag); |
|
info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1; |
|
|
|
if (cflag & PARENB) |
|
info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN; |
|
else |
|
info->params.parity = ASYNC_PARITY_NONE; |
|
|
|
/* calculate number of jiffies to transmit a full |
|
* FIFO (32 bytes) at specified data rate |
|
*/ |
|
bits_per_char = info->params.data_bits + |
|
info->params.stop_bits + 1; |
|
|
|
info->params.data_rate = tty_get_baud_rate(info->port.tty); |
|
|
|
if (info->params.data_rate) { |
|
info->timeout = (32*HZ*bits_per_char) / |
|
info->params.data_rate; |
|
} |
|
info->timeout += HZ/50; /* Add .02 seconds of slop */ |
|
|
|
tty_port_set_cts_flow(&info->port, cflag & CRTSCTS); |
|
tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL); |
|
|
|
/* process tty input control flags */ |
|
|
|
info->read_status_mask = IRQ_RXOVER; |
|
if (I_INPCK(info->port.tty)) |
|
info->read_status_mask |= MASK_PARITY | MASK_FRAMING; |
|
if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty)) |
|
info->read_status_mask |= MASK_BREAK; |
|
if (I_IGNPAR(info->port.tty)) |
|
info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING; |
|
if (I_IGNBRK(info->port.tty)) { |
|
info->ignore_status_mask |= MASK_BREAK; |
|
/* If ignoring parity and break indicators, ignore |
|
* overruns too. (For real raw support). |
|
*/ |
|
if (I_IGNPAR(info->port.tty)) |
|
info->ignore_status_mask |= MASK_OVERRUN; |
|
} |
|
|
|
program_hw(info); |
|
} |
|
|
|
static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount) |
|
{ |
|
DBGINFO(("%s get_stats\n", info->device_name)); |
|
if (!user_icount) { |
|
memset(&info->icount, 0, sizeof(info->icount)); |
|
} else { |
|
if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount))) |
|
return -EFAULT; |
|
} |
|
return 0; |
|
} |
|
|
|
static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params) |
|
{ |
|
DBGINFO(("%s get_params\n", info->device_name)); |
|
if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS))) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params) |
|
{ |
|
unsigned long flags; |
|
MGSL_PARAMS tmp_params; |
|
|
|
DBGINFO(("%s set_params\n", info->device_name)); |
|
if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS))) |
|
return -EFAULT; |
|
|
|
spin_lock_irqsave(&info->lock, flags); |
|
if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) |
|
info->base_clock = tmp_params.clock_speed; |
|
else |
|
memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS)); |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
|
|
program_hw(info); |
|
|
|
return 0; |
|
} |
|
|
|
static int get_txidle(struct slgt_info *info, int __user *idle_mode) |
|
{ |
|
DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode)); |
|
if (put_user(info->idle_mode, idle_mode)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
static int set_txidle(struct slgt_info *info, int idle_mode) |
|
{ |
|
unsigned long flags; |
|
DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode)); |
|
spin_lock_irqsave(&info->lock,flags); |
|
info->idle_mode = idle_mode; |
|
if (info->params.mode != MGSL_MODE_ASYNC) |
|
tx_set_idle(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
return 0; |
|
} |
|
|
|
static int tx_enable(struct slgt_info *info, int enable) |
|
{ |
|
unsigned long flags; |
|
DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable)); |
|
spin_lock_irqsave(&info->lock,flags); |
|
if (enable) { |
|
if (!info->tx_enabled) |
|
tx_start(info); |
|
} else { |
|
if (info->tx_enabled) |
|
tx_stop(info); |
|
} |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
return 0; |
|
} |
|
|
|
/* |
|
* abort transmit HDLC frame |
|
*/ |
|
static int tx_abort(struct slgt_info *info) |
|
{ |
|
unsigned long flags; |
|
DBGINFO(("%s tx_abort\n", info->device_name)); |
|
spin_lock_irqsave(&info->lock,flags); |
|
tdma_reset(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
return 0; |
|
} |
|
|
|
static int rx_enable(struct slgt_info *info, int enable) |
|
{ |
|
unsigned long flags; |
|
unsigned int rbuf_fill_level; |
|
DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable)); |
|
spin_lock_irqsave(&info->lock,flags); |
|
/* |
|
* enable[31..16] = receive DMA buffer fill level |
|
* 0 = noop (leave fill level unchanged) |
|
* fill level must be multiple of 4 and <= buffer size |
|
*/ |
|
rbuf_fill_level = ((unsigned int)enable) >> 16; |
|
if (rbuf_fill_level) { |
|
if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) { |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
return -EINVAL; |
|
} |
|
info->rbuf_fill_level = rbuf_fill_level; |
|
if (rbuf_fill_level < 128) |
|
info->rx_pio = 1; /* PIO mode */ |
|
else |
|
info->rx_pio = 0; /* DMA mode */ |
|
rx_stop(info); /* restart receiver to use new fill level */ |
|
} |
|
|
|
/* |
|
* enable[1..0] = receiver enable command |
|
* 0 = disable |
|
* 1 = enable |
|
* 2 = enable or force hunt mode if already enabled |
|
*/ |
|
enable &= 3; |
|
if (enable) { |
|
if (!info->rx_enabled) |
|
rx_start(info); |
|
else if (enable == 2) { |
|
/* force hunt mode (write 1 to RCR[3]) */ |
|
wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3); |
|
} |
|
} else { |
|
if (info->rx_enabled) |
|
rx_stop(info); |
|
} |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
return 0; |
|
} |
|
|
|
/* |
|
* wait for specified event to occur |
|
*/ |
|
static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr) |
|
{ |
|
unsigned long flags; |
|
int s; |
|
int rc=0; |
|
struct mgsl_icount cprev, cnow; |
|
int events; |
|
int mask; |
|
struct _input_signal_events oldsigs, newsigs; |
|
DECLARE_WAITQUEUE(wait, current); |
|
|
|
if (get_user(mask, mask_ptr)) |
|
return -EFAULT; |
|
|
|
DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask)); |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
|
|
/* return immediately if state matches requested events */ |
|
get_gtsignals(info); |
|
s = info->signals; |
|
|
|
events = mask & |
|
( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) + |
|
((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) + |
|
((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) + |
|
((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) ); |
|
if (events) { |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
goto exit; |
|
} |
|
|
|
/* save current irq counts */ |
|
cprev = info->icount; |
|
oldsigs = info->input_signal_events; |
|
|
|
/* enable hunt and idle irqs if needed */ |
|
if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) { |
|
unsigned short val = rd_reg16(info, SCR); |
|
if (!(val & IRQ_RXIDLE)) |
|
wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE)); |
|
} |
|
|
|
set_current_state(TASK_INTERRUPTIBLE); |
|
add_wait_queue(&info->event_wait_q, &wait); |
|
|
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
for(;;) { |
|
schedule(); |
|
if (signal_pending(current)) { |
|
rc = -ERESTARTSYS; |
|
break; |
|
} |
|
|
|
/* get current irq counts */ |
|
spin_lock_irqsave(&info->lock,flags); |
|
cnow = info->icount; |
|
newsigs = info->input_signal_events; |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
/* if no change, wait aborted for some reason */ |
|
if (newsigs.dsr_up == oldsigs.dsr_up && |
|
newsigs.dsr_down == oldsigs.dsr_down && |
|
newsigs.dcd_up == oldsigs.dcd_up && |
|
newsigs.dcd_down == oldsigs.dcd_down && |
|
newsigs.cts_up == oldsigs.cts_up && |
|
newsigs.cts_down == oldsigs.cts_down && |
|
newsigs.ri_up == oldsigs.ri_up && |
|
newsigs.ri_down == oldsigs.ri_down && |
|
cnow.exithunt == cprev.exithunt && |
|
cnow.rxidle == cprev.rxidle) { |
|
rc = -EIO; |
|
break; |
|
} |
|
|
|
events = mask & |
|
( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) + |
|
(newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) + |
|
(newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) + |
|
(newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) + |
|
(newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) + |
|
(newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) + |
|
(newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) + |
|
(newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) + |
|
(cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) + |
|
(cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) ); |
|
if (events) |
|
break; |
|
|
|
cprev = cnow; |
|
oldsigs = newsigs; |
|
} |
|
|
|
remove_wait_queue(&info->event_wait_q, &wait); |
|
set_current_state(TASK_RUNNING); |
|
|
|
|
|
if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) { |
|
spin_lock_irqsave(&info->lock,flags); |
|
if (!waitqueue_active(&info->event_wait_q)) { |
|
/* disable enable exit hunt mode/idle rcvd IRQs */ |
|
wr_reg16(info, SCR, |
|
(unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE)); |
|
} |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
exit: |
|
if (rc == 0) |
|
rc = put_user(events, mask_ptr); |
|
return rc; |
|
} |
|
|
|
static int get_interface(struct slgt_info *info, int __user *if_mode) |
|
{ |
|
DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode)); |
|
if (put_user(info->if_mode, if_mode)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
static int set_interface(struct slgt_info *info, int if_mode) |
|
{ |
|
unsigned long flags; |
|
unsigned short val; |
|
|
|
DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode)); |
|
spin_lock_irqsave(&info->lock,flags); |
|
info->if_mode = if_mode; |
|
|
|
msc_set_vcr(info); |
|
|
|
/* TCR (tx control) 07 1=RTS driver control */ |
|
val = rd_reg16(info, TCR); |
|
if (info->if_mode & MGSL_INTERFACE_RTS_EN) |
|
val |= BIT7; |
|
else |
|
val &= ~BIT7; |
|
wr_reg16(info, TCR, val); |
|
|
|
spin_unlock_irqrestore(&info->lock,flags); |
|
return 0; |
|
} |
|
|
|
static int get_xsync(struct slgt_info *info, int __user *xsync) |
|
{ |
|
DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync)); |
|
if (put_user(info->xsync, xsync)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
/* |
|
* set extended sync pattern (1 to 4 bytes) for extended sync mode |
|
* |
|
* sync pattern is contained in least significant bytes of value |
|
* most significant byte of sync pattern is oldest (1st sent/detected) |
|
*/ |
|
static int set_xsync(struct slgt_info *info, int xsync) |
|
{ |
|
unsigned long flags; |
|
|
|
DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync)); |
|
spin_lock_irqsave(&info->lock, flags); |
|
info->xsync = xsync; |
|
wr_reg32(info, XSR, xsync); |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
return 0; |
|
} |
|
|
|
static int get_xctrl(struct slgt_info *info, int __user *xctrl) |
|
{ |
|
DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl)); |
|
if (put_user(info->xctrl, xctrl)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
/* |
|
* set extended control options |
|
* |
|
* xctrl[31:19] reserved, must be zero |
|
* xctrl[18:17] extended sync pattern length in bytes |
|
* 00 = 1 byte in xsr[7:0] |
|
* 01 = 2 bytes in xsr[15:0] |
|
* 10 = 3 bytes in xsr[23:0] |
|
* 11 = 4 bytes in xsr[31:0] |
|
* xctrl[16] 1 = enable terminal count, 0=disabled |
|
* xctrl[15:0] receive terminal count for fixed length packets |
|
* value is count minus one (0 = 1 byte packet) |
|
* when terminal count is reached, receiver |
|
* automatically returns to hunt mode and receive |
|
* FIFO contents are flushed to DMA buffers with |
|
* end of frame (EOF) status |
|
*/ |
|
static int set_xctrl(struct slgt_info *info, int xctrl) |
|
{ |
|
unsigned long flags; |
|
|
|
DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl)); |
|
spin_lock_irqsave(&info->lock, flags); |
|
info->xctrl = xctrl; |
|
wr_reg32(info, XCR, xctrl); |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
return 0; |
|
} |
|
|
|
/* |
|
* set general purpose IO pin state and direction |
|
* |
|
* user_gpio fields: |
|
* state each bit indicates a pin state |
|
* smask set bit indicates pin state to set |
|
* dir each bit indicates a pin direction (0=input, 1=output) |
|
* dmask set bit indicates pin direction to set |
|
*/ |
|
static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) |
|
{ |
|
unsigned long flags; |
|
struct gpio_desc gpio; |
|
__u32 data; |
|
|
|
if (!info->gpio_present) |
|
return -EINVAL; |
|
if (copy_from_user(&gpio, user_gpio, sizeof(gpio))) |
|
return -EFAULT; |
|
DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n", |
|
info->device_name, gpio.state, gpio.smask, |
|
gpio.dir, gpio.dmask)); |
|
|
|
spin_lock_irqsave(&info->port_array[0]->lock, flags); |
|
if (gpio.dmask) { |
|
data = rd_reg32(info, IODR); |
|
data |= gpio.dmask & gpio.dir; |
|
data &= ~(gpio.dmask & ~gpio.dir); |
|
wr_reg32(info, IODR, data); |
|
} |
|
if (gpio.smask) { |
|
data = rd_reg32(info, IOVR); |
|
data |= gpio.smask & gpio.state; |
|
data &= ~(gpio.smask & ~gpio.state); |
|
wr_reg32(info, IOVR, data); |
|
} |
|
spin_unlock_irqrestore(&info->port_array[0]->lock, flags); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* get general purpose IO pin state and direction |
|
*/ |
|
static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) |
|
{ |
|
struct gpio_desc gpio; |
|
if (!info->gpio_present) |
|
return -EINVAL; |
|
gpio.state = rd_reg32(info, IOVR); |
|
gpio.smask = 0xffffffff; |
|
gpio.dir = rd_reg32(info, IODR); |
|
gpio.dmask = 0xffffffff; |
|
if (copy_to_user(user_gpio, &gpio, sizeof(gpio))) |
|
return -EFAULT; |
|
DBGINFO(("%s get_gpio state=%08x dir=%08x\n", |
|
info->device_name, gpio.state, gpio.dir)); |
|
return 0; |
|
} |
|
|
|
/* |
|
* conditional wait facility |
|
*/ |
|
static void init_cond_wait(struct cond_wait *w, unsigned int data) |
|
{ |
|
init_waitqueue_head(&w->q); |
|
init_waitqueue_entry(&w->wait, current); |
|
w->data = data; |
|
} |
|
|
|
static void add_cond_wait(struct cond_wait **head, struct cond_wait *w) |
|
{ |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
add_wait_queue(&w->q, &w->wait); |
|
w->next = *head; |
|
*head = w; |
|
} |
|
|
|
static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw) |
|
{ |
|
struct cond_wait *w, *prev; |
|
remove_wait_queue(&cw->q, &cw->wait); |
|
set_current_state(TASK_RUNNING); |
|
for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) { |
|
if (w == cw) { |
|
if (prev != NULL) |
|
prev->next = w->next; |
|
else |
|
*head = w->next; |
|
break; |
|
} |
|
} |
|
} |
|
|
|
static void flush_cond_wait(struct cond_wait **head) |
|
{ |
|
while (*head != NULL) { |
|
wake_up_interruptible(&(*head)->q); |
|
*head = (*head)->next; |
|
} |
|
} |
|
|
|
/* |
|
* wait for general purpose I/O pin(s) to enter specified state |
|
* |
|
* user_gpio fields: |
|
* state - bit indicates target pin state |
|
* smask - set bit indicates watched pin |
|
* |
|
* The wait ends when at least one watched pin enters the specified |
|
* state. When 0 (no error) is returned, user_gpio->state is set to the |
|
* state of all GPIO pins when the wait ends. |
|
* |
|
* Note: Each pin may be a dedicated input, dedicated output, or |
|
* configurable input/output. The number and configuration of pins |
|
* varies with the specific adapter model. Only input pins (dedicated |
|
* or configured) can be monitored with this function. |
|
*/ |
|
static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio) |
|
{ |
|
unsigned long flags; |
|
int rc = 0; |
|
struct gpio_desc gpio; |
|
struct cond_wait wait; |
|
u32 state; |
|
|
|
if (!info->gpio_present) |
|
return -EINVAL; |
|
if (copy_from_user(&gpio, user_gpio, sizeof(gpio))) |
|
return -EFAULT; |
|
DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n", |
|
info->device_name, gpio.state, gpio.smask)); |
|
/* ignore output pins identified by set IODR bit */ |
|
if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0) |
|
return -EINVAL; |
|
init_cond_wait(&wait, gpio.smask); |
|
|
|
spin_lock_irqsave(&info->port_array[0]->lock, flags); |
|
/* enable interrupts for watched pins */ |
|
wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask); |
|
/* get current pin states */ |
|
state = rd_reg32(info, IOVR); |
|
|
|
if (gpio.smask & ~(state ^ gpio.state)) { |
|
/* already in target state */ |
|
gpio.state = state; |
|
} else { |
|
/* wait for target state */ |
|
add_cond_wait(&info->gpio_wait_q, &wait); |
|
spin_unlock_irqrestore(&info->port_array[0]->lock, flags); |
|
schedule(); |
|
if (signal_pending(current)) |
|
rc = -ERESTARTSYS; |
|
else |
|
gpio.state = wait.data; |
|
spin_lock_irqsave(&info->port_array[0]->lock, flags); |
|
remove_cond_wait(&info->gpio_wait_q, &wait); |
|
} |
|
|
|
/* disable all GPIO interrupts if no waiting processes */ |
|
if (info->gpio_wait_q == NULL) |
|
wr_reg32(info, IOER, 0); |
|
spin_unlock_irqrestore(&info->port_array[0]->lock, flags); |
|
|
|
if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio))) |
|
rc = -EFAULT; |
|
return rc; |
|
} |
|
|
|
static int modem_input_wait(struct slgt_info *info,int arg) |
|
{ |
|
unsigned long flags; |
|
int rc; |
|
struct mgsl_icount cprev, cnow; |
|
DECLARE_WAITQUEUE(wait, current); |
|
|
|
/* save current irq counts */ |
|
spin_lock_irqsave(&info->lock,flags); |
|
cprev = info->icount; |
|
add_wait_queue(&info->status_event_wait_q, &wait); |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
for(;;) { |
|
schedule(); |
|
if (signal_pending(current)) { |
|
rc = -ERESTARTSYS; |
|
break; |
|
} |
|
|
|
/* get new irq counts */ |
|
spin_lock_irqsave(&info->lock,flags); |
|
cnow = info->icount; |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
/* if no change, wait aborted for some reason */ |
|
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && |
|
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { |
|
rc = -EIO; |
|
break; |
|
} |
|
|
|
/* check for change in caller specified modem input */ |
|
if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) || |
|
(arg & TIOCM_DSR && cnow.dsr != cprev.dsr) || |
|
(arg & TIOCM_CD && cnow.dcd != cprev.dcd) || |
|
(arg & TIOCM_CTS && cnow.cts != cprev.cts)) { |
|
rc = 0; |
|
break; |
|
} |
|
|
|
cprev = cnow; |
|
} |
|
remove_wait_queue(&info->status_event_wait_q, &wait); |
|
set_current_state(TASK_RUNNING); |
|
return rc; |
|
} |
|
|
|
/* |
|
* return state of serial control and status signals |
|
*/ |
|
static int tiocmget(struct tty_struct *tty) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned int result; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
get_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) + |
|
((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) + |
|
((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) + |
|
((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) + |
|
((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) + |
|
((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0); |
|
|
|
DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result)); |
|
return result; |
|
} |
|
|
|
/* |
|
* set modem control signals (DTR/RTS) |
|
* |
|
* cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit |
|
* TIOCMSET = set/clear signal values |
|
* value bit mask for command |
|
*/ |
|
static int tiocmset(struct tty_struct *tty, |
|
unsigned int set, unsigned int clear) |
|
{ |
|
struct slgt_info *info = tty->driver_data; |
|
unsigned long flags; |
|
|
|
DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear)); |
|
|
|
if (set & TIOCM_RTS) |
|
info->signals |= SerialSignal_RTS; |
|
if (set & TIOCM_DTR) |
|
info->signals |= SerialSignal_DTR; |
|
if (clear & TIOCM_RTS) |
|
info->signals &= ~SerialSignal_RTS; |
|
if (clear & TIOCM_DTR) |
|
info->signals &= ~SerialSignal_DTR; |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
set_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
return 0; |
|
} |
|
|
|
static int carrier_raised(struct tty_port *port) |
|
{ |
|
unsigned long flags; |
|
struct slgt_info *info = container_of(port, struct slgt_info, port); |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
get_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
return (info->signals & SerialSignal_DCD) ? 1 : 0; |
|
} |
|
|
|
static void dtr_rts(struct tty_port *port, int on) |
|
{ |
|
unsigned long flags; |
|
struct slgt_info *info = container_of(port, struct slgt_info, port); |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
if (on) |
|
info->signals |= SerialSignal_RTS | SerialSignal_DTR; |
|
else |
|
info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); |
|
set_gtsignals(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
|
|
|
|
/* |
|
* block current process until the device is ready to open |
|
*/ |
|
static int block_til_ready(struct tty_struct *tty, struct file *filp, |
|
struct slgt_info *info) |
|
{ |
|
DECLARE_WAITQUEUE(wait, current); |
|
int retval; |
|
bool do_clocal = false; |
|
unsigned long flags; |
|
int cd; |
|
struct tty_port *port = &info->port; |
|
|
|
DBGINFO(("%s block_til_ready\n", tty->driver->name)); |
|
|
|
if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) { |
|
/* nonblock mode is set or port is not enabled */ |
|
tty_port_set_active(port, 1); |
|
return 0; |
|
} |
|
|
|
if (C_CLOCAL(tty)) |
|
do_clocal = true; |
|
|
|
/* Wait for carrier detect and the line to become |
|
* free (i.e., not in use by the callout). While we are in |
|
* this loop, port->count is dropped by one, so that |
|
* close() knows when to free things. We restore it upon |
|
* exit, either normal or abnormal. |
|
*/ |
|
|
|
retval = 0; |
|
add_wait_queue(&port->open_wait, &wait); |
|
|
|
spin_lock_irqsave(&info->lock, flags); |
|
port->count--; |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
port->blocked_open++; |
|
|
|
while (1) { |
|
if (C_BAUD(tty) && tty_port_initialized(port)) |
|
tty_port_raise_dtr_rts(port); |
|
|
|
set_current_state(TASK_INTERRUPTIBLE); |
|
|
|
if (tty_hung_up_p(filp) || !tty_port_initialized(port)) { |
|
retval = (port->flags & ASYNC_HUP_NOTIFY) ? |
|
-EAGAIN : -ERESTARTSYS; |
|
break; |
|
} |
|
|
|
cd = tty_port_carrier_raised(port); |
|
if (do_clocal || cd) |
|
break; |
|
|
|
if (signal_pending(current)) { |
|
retval = -ERESTARTSYS; |
|
break; |
|
} |
|
|
|
DBGINFO(("%s block_til_ready wait\n", tty->driver->name)); |
|
tty_unlock(tty); |
|
schedule(); |
|
tty_lock(tty); |
|
} |
|
|
|
set_current_state(TASK_RUNNING); |
|
remove_wait_queue(&port->open_wait, &wait); |
|
|
|
if (!tty_hung_up_p(filp)) |
|
port->count++; |
|
port->blocked_open--; |
|
|
|
if (!retval) |
|
tty_port_set_active(port, 1); |
|
|
|
DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval)); |
|
return retval; |
|
} |
|
|
|
/* |
|
* allocate buffers used for calling line discipline receive_buf |
|
* directly in synchronous mode |
|
* note: add 5 bytes to max frame size to allow appending |
|
* 32-bit CRC and status byte when configured to do so |
|
*/ |
|
static int alloc_tmp_rbuf(struct slgt_info *info) |
|
{ |
|
info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL); |
|
if (info->tmp_rbuf == NULL) |
|
return -ENOMEM; |
|
/* unused flag buffer to satisfy receive_buf calling interface */ |
|
info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL); |
|
if (!info->flag_buf) { |
|
kfree(info->tmp_rbuf); |
|
info->tmp_rbuf = NULL; |
|
return -ENOMEM; |
|
} |
|
return 0; |
|
} |
|
|
|
static void free_tmp_rbuf(struct slgt_info *info) |
|
{ |
|
kfree(info->tmp_rbuf); |
|
info->tmp_rbuf = NULL; |
|
kfree(info->flag_buf); |
|
info->flag_buf = NULL; |
|
} |
|
|
|
/* |
|
* allocate DMA descriptor lists. |
|
*/ |
|
static int alloc_desc(struct slgt_info *info) |
|
{ |
|
unsigned int i; |
|
unsigned int pbufs; |
|
|
|
/* allocate memory to hold descriptor lists */ |
|
info->bufs = dma_alloc_coherent(&info->pdev->dev, DESC_LIST_SIZE, |
|
&info->bufs_dma_addr, GFP_KERNEL); |
|
if (info->bufs == NULL) |
|
return -ENOMEM; |
|
|
|
info->rbufs = (struct slgt_desc*)info->bufs; |
|
info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count; |
|
|
|
pbufs = (unsigned int)info->bufs_dma_addr; |
|
|
|
/* |
|
* Build circular lists of descriptors |
|
*/ |
|
|
|
for (i=0; i < info->rbuf_count; i++) { |
|
/* physical address of this descriptor */ |
|
info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc)); |
|
|
|
/* physical address of next descriptor */ |
|
if (i == info->rbuf_count - 1) |
|
info->rbufs[i].next = cpu_to_le32(pbufs); |
|
else |
|
info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc))); |
|
set_desc_count(info->rbufs[i], DMABUFSIZE); |
|
} |
|
|
|
for (i=0; i < info->tbuf_count; i++) { |
|
/* physical address of this descriptor */ |
|
info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc)); |
|
|
|
/* physical address of next descriptor */ |
|
if (i == info->tbuf_count - 1) |
|
info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc)); |
|
else |
|
info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc))); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void free_desc(struct slgt_info *info) |
|
{ |
|
if (info->bufs != NULL) { |
|
dma_free_coherent(&info->pdev->dev, DESC_LIST_SIZE, |
|
info->bufs, info->bufs_dma_addr); |
|
info->bufs = NULL; |
|
info->rbufs = NULL; |
|
info->tbufs = NULL; |
|
} |
|
} |
|
|
|
static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count) |
|
{ |
|
int i; |
|
for (i=0; i < count; i++) { |
|
bufs[i].buf = dma_alloc_coherent(&info->pdev->dev, DMABUFSIZE, |
|
&bufs[i].buf_dma_addr, GFP_KERNEL); |
|
if (!bufs[i].buf) |
|
return -ENOMEM; |
|
bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr); |
|
} |
|
return 0; |
|
} |
|
|
|
static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count) |
|
{ |
|
int i; |
|
for (i=0; i < count; i++) { |
|
if (bufs[i].buf == NULL) |
|
continue; |
|
dma_free_coherent(&info->pdev->dev, DMABUFSIZE, bufs[i].buf, |
|
bufs[i].buf_dma_addr); |
|
bufs[i].buf = NULL; |
|
} |
|
} |
|
|
|
static int alloc_dma_bufs(struct slgt_info *info) |
|
{ |
|
info->rbuf_count = 32; |
|
info->tbuf_count = 32; |
|
|
|
if (alloc_desc(info) < 0 || |
|
alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 || |
|
alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 || |
|
alloc_tmp_rbuf(info) < 0) { |
|
DBGERR(("%s DMA buffer alloc fail\n", info->device_name)); |
|
return -ENOMEM; |
|
} |
|
reset_rbufs(info); |
|
return 0; |
|
} |
|
|
|
static void free_dma_bufs(struct slgt_info *info) |
|
{ |
|
if (info->bufs) { |
|
free_bufs(info, info->rbufs, info->rbuf_count); |
|
free_bufs(info, info->tbufs, info->tbuf_count); |
|
free_desc(info); |
|
} |
|
free_tmp_rbuf(info); |
|
} |
|
|
|
static int claim_resources(struct slgt_info *info) |
|
{ |
|
if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) { |
|
DBGERR(("%s reg addr conflict, addr=%08X\n", |
|
info->device_name, info->phys_reg_addr)); |
|
info->init_error = DiagStatus_AddressConflict; |
|
goto errout; |
|
} |
|
else |
|
info->reg_addr_requested = true; |
|
|
|
info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE); |
|
if (!info->reg_addr) { |
|
DBGERR(("%s can't map device registers, addr=%08X\n", |
|
info->device_name, info->phys_reg_addr)); |
|
info->init_error = DiagStatus_CantAssignPciResources; |
|
goto errout; |
|
} |
|
return 0; |
|
|
|
errout: |
|
release_resources(info); |
|
return -ENODEV; |
|
} |
|
|
|
static void release_resources(struct slgt_info *info) |
|
{ |
|
if (info->irq_requested) { |
|
free_irq(info->irq_level, info); |
|
info->irq_requested = false; |
|
} |
|
|
|
if (info->reg_addr_requested) { |
|
release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE); |
|
info->reg_addr_requested = false; |
|
} |
|
|
|
if (info->reg_addr) { |
|
iounmap(info->reg_addr); |
|
info->reg_addr = NULL; |
|
} |
|
} |
|
|
|
/* Add the specified device instance data structure to the |
|
* global linked list of devices and increment the device count. |
|
*/ |
|
static void add_device(struct slgt_info *info) |
|
{ |
|
char *devstr; |
|
|
|
info->next_device = NULL; |
|
info->line = slgt_device_count; |
|
sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line); |
|
|
|
if (info->line < MAX_DEVICES) { |
|
if (maxframe[info->line]) |
|
info->max_frame_size = maxframe[info->line]; |
|
} |
|
|
|
slgt_device_count++; |
|
|
|
if (!slgt_device_list) |
|
slgt_device_list = info; |
|
else { |
|
struct slgt_info *current_dev = slgt_device_list; |
|
while(current_dev->next_device) |
|
current_dev = current_dev->next_device; |
|
current_dev->next_device = info; |
|
} |
|
|
|
if (info->max_frame_size < 4096) |
|
info->max_frame_size = 4096; |
|
else if (info->max_frame_size > 65535) |
|
info->max_frame_size = 65535; |
|
|
|
switch(info->pdev->device) { |
|
case SYNCLINK_GT_DEVICE_ID: |
|
devstr = "GT"; |
|
break; |
|
case SYNCLINK_GT2_DEVICE_ID: |
|
devstr = "GT2"; |
|
break; |
|
case SYNCLINK_GT4_DEVICE_ID: |
|
devstr = "GT4"; |
|
break; |
|
case SYNCLINK_AC_DEVICE_ID: |
|
devstr = "AC"; |
|
info->params.mode = MGSL_MODE_ASYNC; |
|
break; |
|
default: |
|
devstr = "(unknown model)"; |
|
} |
|
printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n", |
|
devstr, info->device_name, info->phys_reg_addr, |
|
info->irq_level, info->max_frame_size); |
|
|
|
#if SYNCLINK_GENERIC_HDLC |
|
hdlcdev_init(info); |
|
#endif |
|
} |
|
|
|
static const struct tty_port_operations slgt_port_ops = { |
|
.carrier_raised = carrier_raised, |
|
.dtr_rts = dtr_rts, |
|
}; |
|
|
|
/* |
|
* allocate device instance structure, return NULL on failure |
|
*/ |
|
static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev) |
|
{ |
|
struct slgt_info *info; |
|
|
|
info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL); |
|
|
|
if (!info) { |
|
DBGERR(("%s device alloc failed adapter=%d port=%d\n", |
|
driver_name, adapter_num, port_num)); |
|
} else { |
|
tty_port_init(&info->port); |
|
info->port.ops = &slgt_port_ops; |
|
info->magic = MGSL_MAGIC; |
|
INIT_WORK(&info->task, bh_handler); |
|
info->max_frame_size = 4096; |
|
info->base_clock = 14745600; |
|
info->rbuf_fill_level = DMABUFSIZE; |
|
init_waitqueue_head(&info->status_event_wait_q); |
|
init_waitqueue_head(&info->event_wait_q); |
|
spin_lock_init(&info->netlock); |
|
memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS)); |
|
info->idle_mode = HDLC_TXIDLE_FLAGS; |
|
info->adapter_num = adapter_num; |
|
info->port_num = port_num; |
|
|
|
timer_setup(&info->tx_timer, tx_timeout, 0); |
|
timer_setup(&info->rx_timer, rx_timeout, 0); |
|
|
|
/* Copy configuration info to device instance data */ |
|
info->pdev = pdev; |
|
info->irq_level = pdev->irq; |
|
info->phys_reg_addr = pci_resource_start(pdev,0); |
|
|
|
info->bus_type = MGSL_BUS_TYPE_PCI; |
|
info->irq_flags = IRQF_SHARED; |
|
|
|
info->init_error = -1; /* assume error, set to 0 on successful init */ |
|
} |
|
|
|
return info; |
|
} |
|
|
|
static void device_init(int adapter_num, struct pci_dev *pdev) |
|
{ |
|
struct slgt_info *port_array[SLGT_MAX_PORTS]; |
|
int i; |
|
int port_count = 1; |
|
|
|
if (pdev->device == SYNCLINK_GT2_DEVICE_ID) |
|
port_count = 2; |
|
else if (pdev->device == SYNCLINK_GT4_DEVICE_ID) |
|
port_count = 4; |
|
|
|
/* allocate device instances for all ports */ |
|
for (i=0; i < port_count; ++i) { |
|
port_array[i] = alloc_dev(adapter_num, i, pdev); |
|
if (port_array[i] == NULL) { |
|
for (--i; i >= 0; --i) { |
|
tty_port_destroy(&port_array[i]->port); |
|
kfree(port_array[i]); |
|
} |
|
return; |
|
} |
|
} |
|
|
|
/* give copy of port_array to all ports and add to device list */ |
|
for (i=0; i < port_count; ++i) { |
|
memcpy(port_array[i]->port_array, port_array, sizeof(port_array)); |
|
add_device(port_array[i]); |
|
port_array[i]->port_count = port_count; |
|
spin_lock_init(&port_array[i]->lock); |
|
} |
|
|
|
/* Allocate and claim adapter resources */ |
|
if (!claim_resources(port_array[0])) { |
|
|
|
alloc_dma_bufs(port_array[0]); |
|
|
|
/* copy resource information from first port to others */ |
|
for (i = 1; i < port_count; ++i) { |
|
port_array[i]->irq_level = port_array[0]->irq_level; |
|
port_array[i]->reg_addr = port_array[0]->reg_addr; |
|
alloc_dma_bufs(port_array[i]); |
|
} |
|
|
|
if (request_irq(port_array[0]->irq_level, |
|
slgt_interrupt, |
|
port_array[0]->irq_flags, |
|
port_array[0]->device_name, |
|
port_array[0]) < 0) { |
|
DBGERR(("%s request_irq failed IRQ=%d\n", |
|
port_array[0]->device_name, |
|
port_array[0]->irq_level)); |
|
} else { |
|
port_array[0]->irq_requested = true; |
|
adapter_test(port_array[0]); |
|
for (i=1 ; i < port_count ; i++) { |
|
port_array[i]->init_error = port_array[0]->init_error; |
|
port_array[i]->gpio_present = port_array[0]->gpio_present; |
|
} |
|
} |
|
} |
|
|
|
for (i = 0; i < port_count; ++i) { |
|
struct slgt_info *info = port_array[i]; |
|
tty_port_register_device(&info->port, serial_driver, info->line, |
|
&info->pdev->dev); |
|
} |
|
} |
|
|
|
static int init_one(struct pci_dev *dev, |
|
const struct pci_device_id *ent) |
|
{ |
|
if (pci_enable_device(dev)) { |
|
printk("error enabling pci device %p\n", dev); |
|
return -EIO; |
|
} |
|
pci_set_master(dev); |
|
device_init(slgt_device_count, dev); |
|
return 0; |
|
} |
|
|
|
static void remove_one(struct pci_dev *dev) |
|
{ |
|
} |
|
|
|
static const struct tty_operations ops = { |
|
.open = open, |
|
.close = close, |
|
.write = write, |
|
.put_char = put_char, |
|
.flush_chars = flush_chars, |
|
.write_room = write_room, |
|
.chars_in_buffer = chars_in_buffer, |
|
.flush_buffer = flush_buffer, |
|
.ioctl = ioctl, |
|
.compat_ioctl = slgt_compat_ioctl, |
|
.throttle = throttle, |
|
.unthrottle = unthrottle, |
|
.send_xchar = send_xchar, |
|
.break_ctl = set_break, |
|
.wait_until_sent = wait_until_sent, |
|
.set_termios = set_termios, |
|
.stop = tx_hold, |
|
.start = tx_release, |
|
.hangup = hangup, |
|
.tiocmget = tiocmget, |
|
.tiocmset = tiocmset, |
|
.get_icount = get_icount, |
|
.proc_show = synclink_gt_proc_show, |
|
}; |
|
|
|
static void slgt_cleanup(void) |
|
{ |
|
struct slgt_info *info; |
|
struct slgt_info *tmp; |
|
|
|
printk(KERN_INFO "unload %s\n", driver_name); |
|
|
|
if (serial_driver) { |
|
for (info=slgt_device_list ; info != NULL ; info=info->next_device) |
|
tty_unregister_device(serial_driver, info->line); |
|
tty_unregister_driver(serial_driver); |
|
tty_driver_kref_put(serial_driver); |
|
} |
|
|
|
/* reset devices */ |
|
info = slgt_device_list; |
|
while(info) { |
|
reset_port(info); |
|
info = info->next_device; |
|
} |
|
|
|
/* release devices */ |
|
info = slgt_device_list; |
|
while(info) { |
|
#if SYNCLINK_GENERIC_HDLC |
|
hdlcdev_exit(info); |
|
#endif |
|
free_dma_bufs(info); |
|
free_tmp_rbuf(info); |
|
if (info->port_num == 0) |
|
release_resources(info); |
|
tmp = info; |
|
info = info->next_device; |
|
tty_port_destroy(&tmp->port); |
|
kfree(tmp); |
|
} |
|
|
|
if (pci_registered) |
|
pci_unregister_driver(&pci_driver); |
|
} |
|
|
|
/* |
|
* Driver initialization entry point. |
|
*/ |
|
static int __init slgt_init(void) |
|
{ |
|
int rc; |
|
|
|
printk(KERN_INFO "%s\n", driver_name); |
|
|
|
serial_driver = tty_alloc_driver(MAX_DEVICES, TTY_DRIVER_REAL_RAW | |
|
TTY_DRIVER_DYNAMIC_DEV); |
|
if (IS_ERR(serial_driver)) { |
|
printk("%s can't allocate tty driver\n", driver_name); |
|
return PTR_ERR(serial_driver); |
|
} |
|
|
|
/* Initialize the tty_driver structure */ |
|
|
|
serial_driver->driver_name = slgt_driver_name; |
|
serial_driver->name = tty_dev_prefix; |
|
serial_driver->major = ttymajor; |
|
serial_driver->minor_start = 64; |
|
serial_driver->type = TTY_DRIVER_TYPE_SERIAL; |
|
serial_driver->subtype = SERIAL_TYPE_NORMAL; |
|
serial_driver->init_termios = tty_std_termios; |
|
serial_driver->init_termios.c_cflag = |
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
|
serial_driver->init_termios.c_ispeed = 9600; |
|
serial_driver->init_termios.c_ospeed = 9600; |
|
tty_set_operations(serial_driver, &ops); |
|
if ((rc = tty_register_driver(serial_driver)) < 0) { |
|
DBGERR(("%s can't register serial driver\n", driver_name)); |
|
tty_driver_kref_put(serial_driver); |
|
serial_driver = NULL; |
|
goto error; |
|
} |
|
|
|
printk(KERN_INFO "%s, tty major#%d\n", |
|
driver_name, serial_driver->major); |
|
|
|
slgt_device_count = 0; |
|
if ((rc = pci_register_driver(&pci_driver)) < 0) { |
|
printk("%s pci_register_driver error=%d\n", driver_name, rc); |
|
goto error; |
|
} |
|
pci_registered = true; |
|
|
|
if (!slgt_device_list) |
|
printk("%s no devices found\n",driver_name); |
|
|
|
return 0; |
|
|
|
error: |
|
slgt_cleanup(); |
|
return rc; |
|
} |
|
|
|
static void __exit slgt_exit(void) |
|
{ |
|
slgt_cleanup(); |
|
} |
|
|
|
module_init(slgt_init); |
|
module_exit(slgt_exit); |
|
|
|
/* |
|
* register access routines |
|
*/ |
|
|
|
#define CALC_REGADDR() \ |
|
unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \ |
|
if (addr >= 0x80) \ |
|
reg_addr += (info->port_num) * 32; \ |
|
else if (addr >= 0x40) \ |
|
reg_addr += (info->port_num) * 16; |
|
|
|
static __u8 rd_reg8(struct slgt_info *info, unsigned int addr) |
|
{ |
|
CALC_REGADDR(); |
|
return readb((void __iomem *)reg_addr); |
|
} |
|
|
|
static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value) |
|
{ |
|
CALC_REGADDR(); |
|
writeb(value, (void __iomem *)reg_addr); |
|
} |
|
|
|
static __u16 rd_reg16(struct slgt_info *info, unsigned int addr) |
|
{ |
|
CALC_REGADDR(); |
|
return readw((void __iomem *)reg_addr); |
|
} |
|
|
|
static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value) |
|
{ |
|
CALC_REGADDR(); |
|
writew(value, (void __iomem *)reg_addr); |
|
} |
|
|
|
static __u32 rd_reg32(struct slgt_info *info, unsigned int addr) |
|
{ |
|
CALC_REGADDR(); |
|
return readl((void __iomem *)reg_addr); |
|
} |
|
|
|
static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value) |
|
{ |
|
CALC_REGADDR(); |
|
writel(value, (void __iomem *)reg_addr); |
|
} |
|
|
|
static void rdma_reset(struct slgt_info *info) |
|
{ |
|
unsigned int i; |
|
|
|
/* set reset bit */ |
|
wr_reg32(info, RDCSR, BIT1); |
|
|
|
/* wait for enable bit cleared */ |
|
for(i=0 ; i < 1000 ; i++) |
|
if (!(rd_reg32(info, RDCSR) & BIT0)) |
|
break; |
|
} |
|
|
|
static void tdma_reset(struct slgt_info *info) |
|
{ |
|
unsigned int i; |
|
|
|
/* set reset bit */ |
|
wr_reg32(info, TDCSR, BIT1); |
|
|
|
/* wait for enable bit cleared */ |
|
for(i=0 ; i < 1000 ; i++) |
|
if (!(rd_reg32(info, TDCSR) & BIT0)) |
|
break; |
|
} |
|
|
|
/* |
|
* enable internal loopback |
|
* TxCLK and RxCLK are generated from BRG |
|
* and TxD is looped back to RxD internally. |
|
*/ |
|
static void enable_loopback(struct slgt_info *info) |
|
{ |
|
/* SCR (serial control) BIT2=loopback enable */ |
|
wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2)); |
|
|
|
if (info->params.mode != MGSL_MODE_ASYNC) { |
|
/* CCR (clock control) |
|
* 07..05 tx clock source (010 = BRG) |
|
* 04..02 rx clock source (010 = BRG) |
|
* 01 auxclk enable (0 = disable) |
|
* 00 BRG enable (1 = enable) |
|
* |
|
* 0100 1001 |
|
*/ |
|
wr_reg8(info, CCR, 0x49); |
|
|
|
/* set speed if available, otherwise use default */ |
|
if (info->params.clock_speed) |
|
set_rate(info, info->params.clock_speed); |
|
else |
|
set_rate(info, 3686400); |
|
} |
|
} |
|
|
|
/* |
|
* set baud rate generator to specified rate |
|
*/ |
|
static void set_rate(struct slgt_info *info, u32 rate) |
|
{ |
|
unsigned int div; |
|
unsigned int osc = info->base_clock; |
|
|
|
/* div = osc/rate - 1 |
|
* |
|
* Round div up if osc/rate is not integer to |
|
* force to next slowest rate. |
|
*/ |
|
|
|
if (rate) { |
|
div = osc/rate; |
|
if (!(osc % rate) && div) |
|
div--; |
|
wr_reg16(info, BDR, (unsigned short)div); |
|
} |
|
} |
|
|
|
static void rx_stop(struct slgt_info *info) |
|
{ |
|
unsigned short val; |
|
|
|
/* disable and reset receiver */ |
|
val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */ |
|
wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */ |
|
wr_reg16(info, RCR, val); /* clear reset bit */ |
|
|
|
slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE); |
|
|
|
/* clear pending rx interrupts */ |
|
wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER); |
|
|
|
rdma_reset(info); |
|
|
|
info->rx_enabled = false; |
|
info->rx_restart = false; |
|
} |
|
|
|
static void rx_start(struct slgt_info *info) |
|
{ |
|
unsigned short val; |
|
|
|
slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA); |
|
|
|
/* clear pending rx overrun IRQ */ |
|
wr_reg16(info, SSR, IRQ_RXOVER); |
|
|
|
/* reset and disable receiver */ |
|
val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */ |
|
wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */ |
|
wr_reg16(info, RCR, val); /* clear reset bit */ |
|
|
|
rdma_reset(info); |
|
reset_rbufs(info); |
|
|
|
if (info->rx_pio) { |
|
/* rx request when rx FIFO not empty */ |
|
wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14)); |
|
slgt_irq_on(info, IRQ_RXDATA); |
|
if (info->params.mode == MGSL_MODE_ASYNC) { |
|
/* enable saving of rx status */ |
|
wr_reg32(info, RDCSR, BIT6); |
|
} |
|
} else { |
|
/* rx request when rx FIFO half full */ |
|
wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14)); |
|
/* set 1st descriptor address */ |
|
wr_reg32(info, RDDAR, info->rbufs[0].pdesc); |
|
|
|
if (info->params.mode != MGSL_MODE_ASYNC) { |
|
/* enable rx DMA and DMA interrupt */ |
|
wr_reg32(info, RDCSR, (BIT2 + BIT0)); |
|
} else { |
|
/* enable saving of rx status, rx DMA and DMA interrupt */ |
|
wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0)); |
|
} |
|
} |
|
|
|
slgt_irq_on(info, IRQ_RXOVER); |
|
|
|
/* enable receiver */ |
|
wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1)); |
|
|
|
info->rx_restart = false; |
|
info->rx_enabled = true; |
|
} |
|
|
|
static void tx_start(struct slgt_info *info) |
|
{ |
|
if (!info->tx_enabled) { |
|
wr_reg16(info, TCR, |
|
(unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2)); |
|
info->tx_enabled = true; |
|
} |
|
|
|
if (desc_count(info->tbufs[info->tbuf_start])) { |
|
info->drop_rts_on_tx_done = false; |
|
|
|
if (info->params.mode != MGSL_MODE_ASYNC) { |
|
if (info->params.flags & HDLC_FLAG_AUTO_RTS) { |
|
get_gtsignals(info); |
|
if (!(info->signals & SerialSignal_RTS)) { |
|
info->signals |= SerialSignal_RTS; |
|
set_gtsignals(info); |
|
info->drop_rts_on_tx_done = true; |
|
} |
|
} |
|
|
|
slgt_irq_off(info, IRQ_TXDATA); |
|
slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE); |
|
/* clear tx idle and underrun status bits */ |
|
wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER)); |
|
} else { |
|
slgt_irq_off(info, IRQ_TXDATA); |
|
slgt_irq_on(info, IRQ_TXIDLE); |
|
/* clear tx idle status bit */ |
|
wr_reg16(info, SSR, IRQ_TXIDLE); |
|
} |
|
/* set 1st descriptor address and start DMA */ |
|
wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc); |
|
wr_reg32(info, TDCSR, BIT2 + BIT0); |
|
info->tx_active = true; |
|
} |
|
} |
|
|
|
static void tx_stop(struct slgt_info *info) |
|
{ |
|
unsigned short val; |
|
|
|
del_timer(&info->tx_timer); |
|
|
|
tdma_reset(info); |
|
|
|
/* reset and disable transmitter */ |
|
val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */ |
|
wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */ |
|
|
|
slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER); |
|
|
|
/* clear tx idle and underrun status bit */ |
|
wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER)); |
|
|
|
reset_tbufs(info); |
|
|
|
info->tx_enabled = false; |
|
info->tx_active = false; |
|
} |
|
|
|
static void reset_port(struct slgt_info *info) |
|
{ |
|
if (!info->reg_addr) |
|
return; |
|
|
|
tx_stop(info); |
|
rx_stop(info); |
|
|
|
info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR); |
|
set_gtsignals(info); |
|
|
|
slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); |
|
} |
|
|
|
static void reset_adapter(struct slgt_info *info) |
|
{ |
|
int i; |
|
for (i=0; i < info->port_count; ++i) { |
|
if (info->port_array[i]) |
|
reset_port(info->port_array[i]); |
|
} |
|
} |
|
|
|
static void async_mode(struct slgt_info *info) |
|
{ |
|
unsigned short val; |
|
|
|
slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); |
|
tx_stop(info); |
|
rx_stop(info); |
|
|
|
/* TCR (tx control) |
|
* |
|
* 15..13 mode, 010=async |
|
* 12..10 encoding, 000=NRZ |
|
* 09 parity enable |
|
* 08 1=odd parity, 0=even parity |
|
* 07 1=RTS driver control |
|
* 06 1=break enable |
|
* 05..04 character length |
|
* 00=5 bits |
|
* 01=6 bits |
|
* 10=7 bits |
|
* 11=8 bits |
|
* 03 0=1 stop bit, 1=2 stop bits |
|
* 02 reset |
|
* 01 enable |
|
* 00 auto-CTS enable |
|
*/ |
|
val = 0x4000; |
|
|
|
if (info->if_mode & MGSL_INTERFACE_RTS_EN) |
|
val |= BIT7; |
|
|
|
if (info->params.parity != ASYNC_PARITY_NONE) { |
|
val |= BIT9; |
|
if (info->params.parity == ASYNC_PARITY_ODD) |
|
val |= BIT8; |
|
} |
|
|
|
switch (info->params.data_bits) |
|
{ |
|
case 6: val |= BIT4; break; |
|
case 7: val |= BIT5; break; |
|
case 8: val |= BIT5 + BIT4; break; |
|
} |
|
|
|
if (info->params.stop_bits != 1) |
|
val |= BIT3; |
|
|
|
if (info->params.flags & HDLC_FLAG_AUTO_CTS) |
|
val |= BIT0; |
|
|
|
wr_reg16(info, TCR, val); |
|
|
|
/* RCR (rx control) |
|
* |
|
* 15..13 mode, 010=async |
|
* 12..10 encoding, 000=NRZ |
|
* 09 parity enable |
|
* 08 1=odd parity, 0=even parity |
|
* 07..06 reserved, must be 0 |
|
* 05..04 character length |
|
* 00=5 bits |
|
* 01=6 bits |
|
* 10=7 bits |
|
* 11=8 bits |
|
* 03 reserved, must be zero |
|
* 02 reset |
|
* 01 enable |
|
* 00 auto-DCD enable |
|
*/ |
|
val = 0x4000; |
|
|
|
if (info->params.parity != ASYNC_PARITY_NONE) { |
|
val |= BIT9; |
|
if (info->params.parity == ASYNC_PARITY_ODD) |
|
val |= BIT8; |
|
} |
|
|
|
switch (info->params.data_bits) |
|
{ |
|
case 6: val |= BIT4; break; |
|
case 7: val |= BIT5; break; |
|
case 8: val |= BIT5 + BIT4; break; |
|
} |
|
|
|
if (info->params.flags & HDLC_FLAG_AUTO_DCD) |
|
val |= BIT0; |
|
|
|
wr_reg16(info, RCR, val); |
|
|
|
/* CCR (clock control) |
|
* |
|
* 07..05 011 = tx clock source is BRG/16 |
|
* 04..02 010 = rx clock source is BRG |
|
* 01 0 = auxclk disabled |
|
* 00 1 = BRG enabled |
|
* |
|
* 0110 1001 |
|
*/ |
|
wr_reg8(info, CCR, 0x69); |
|
|
|
msc_set_vcr(info); |
|
|
|
/* SCR (serial control) |
|
* |
|
* 15 1=tx req on FIFO half empty |
|
* 14 1=rx req on FIFO half full |
|
* 13 tx data IRQ enable |
|
* 12 tx idle IRQ enable |
|
* 11 rx break on IRQ enable |
|
* 10 rx data IRQ enable |
|
* 09 rx break off IRQ enable |
|
* 08 overrun IRQ enable |
|
* 07 DSR IRQ enable |
|
* 06 CTS IRQ enable |
|
* 05 DCD IRQ enable |
|
* 04 RI IRQ enable |
|
* 03 0=16x sampling, 1=8x sampling |
|
* 02 1=txd->rxd internal loopback enable |
|
* 01 reserved, must be zero |
|
* 00 1=master IRQ enable |
|
*/ |
|
val = BIT15 + BIT14 + BIT0; |
|
/* JCR[8] : 1 = x8 async mode feature available */ |
|
if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate && |
|
((info->base_clock < (info->params.data_rate * 16)) || |
|
(info->base_clock % (info->params.data_rate * 16)))) { |
|
/* use 8x sampling */ |
|
val |= BIT3; |
|
set_rate(info, info->params.data_rate * 8); |
|
} else { |
|
/* use 16x sampling */ |
|
set_rate(info, info->params.data_rate * 16); |
|
} |
|
wr_reg16(info, SCR, val); |
|
|
|
slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER); |
|
|
|
if (info->params.loopback) |
|
enable_loopback(info); |
|
} |
|
|
|
static void sync_mode(struct slgt_info *info) |
|
{ |
|
unsigned short val; |
|
|
|
slgt_irq_off(info, IRQ_ALL | IRQ_MASTER); |
|
tx_stop(info); |
|
rx_stop(info); |
|
|
|
/* TCR (tx control) |
|
* |
|
* 15..13 mode |
|
* 000=HDLC/SDLC |
|
* 001=raw bit synchronous |
|
* 010=asynchronous/isochronous |
|
* 011=monosync byte synchronous |
|
* 100=bisync byte synchronous |
|
* 101=xsync byte synchronous |
|
* 12..10 encoding |
|
* 09 CRC enable |
|
* 08 CRC32 |
|
* 07 1=RTS driver control |
|
* 06 preamble enable |
|
* 05..04 preamble length |
|
* 03 share open/close flag |
|
* 02 reset |
|
* 01 enable |
|
* 00 auto-CTS enable |
|
*/ |
|
val = BIT2; |
|
|
|
switch(info->params.mode) { |
|
case MGSL_MODE_XSYNC: |
|
val |= BIT15 + BIT13; |
|
break; |
|
case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break; |
|
case MGSL_MODE_BISYNC: val |= BIT15; break; |
|
case MGSL_MODE_RAW: val |= BIT13; break; |
|
} |
|
if (info->if_mode & MGSL_INTERFACE_RTS_EN) |
|
val |= BIT7; |
|
|
|
switch(info->params.encoding) |
|
{ |
|
case HDLC_ENCODING_NRZB: val |= BIT10; break; |
|
case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break; |
|
case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break; |
|
case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break; |
|
case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break; |
|
case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break; |
|
case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break; |
|
} |
|
|
|
switch (info->params.crc_type & HDLC_CRC_MASK) |
|
{ |
|
case HDLC_CRC_16_CCITT: val |= BIT9; break; |
|
case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break; |
|
} |
|
|
|
if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE) |
|
val |= BIT6; |
|
|
|
switch (info->params.preamble_length) |
|
{ |
|
case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break; |
|
case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break; |
|
case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break; |
|
} |
|
|
|
if (info->params.flags & HDLC_FLAG_AUTO_CTS) |
|
val |= BIT0; |
|
|
|
wr_reg16(info, TCR, val); |
|
|
|
/* TPR (transmit preamble) */ |
|
|
|
switch (info->params.preamble) |
|
{ |
|
case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break; |
|
case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break; |
|
case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break; |
|
case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break; |
|
case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break; |
|
default: val = 0x7e; break; |
|
} |
|
wr_reg8(info, TPR, (unsigned char)val); |
|
|
|
/* RCR (rx control) |
|
* |
|
* 15..13 mode |
|
* 000=HDLC/SDLC |
|
* 001=raw bit synchronous |
|
* 010=asynchronous/isochronous |
|
* 011=monosync byte synchronous |
|
* 100=bisync byte synchronous |
|
* 101=xsync byte synchronous |
|
* 12..10 encoding |
|
* 09 CRC enable |
|
* 08 CRC32 |
|
* 07..03 reserved, must be 0 |
|
* 02 reset |
|
* 01 enable |
|
* 00 auto-DCD enable |
|
*/ |
|
val = 0; |
|
|
|
switch(info->params.mode) { |
|
case MGSL_MODE_XSYNC: |
|
val |= BIT15 + BIT13; |
|
break; |
|
case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break; |
|
case MGSL_MODE_BISYNC: val |= BIT15; break; |
|
case MGSL_MODE_RAW: val |= BIT13; break; |
|
} |
|
|
|
switch(info->params.encoding) |
|
{ |
|
case HDLC_ENCODING_NRZB: val |= BIT10; break; |
|
case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break; |
|
case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break; |
|
case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break; |
|
case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break; |
|
case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break; |
|
case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break; |
|
} |
|
|
|
switch (info->params.crc_type & HDLC_CRC_MASK) |
|
{ |
|
case HDLC_CRC_16_CCITT: val |= BIT9; break; |
|
case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break; |
|
} |
|
|
|
if (info->params.flags & HDLC_FLAG_AUTO_DCD) |
|
val |= BIT0; |
|
|
|
wr_reg16(info, RCR, val); |
|
|
|
/* CCR (clock control) |
|
* |
|
* 07..05 tx clock source |
|
* 04..02 rx clock source |
|
* 01 auxclk enable |
|
* 00 BRG enable |
|
*/ |
|
val = 0; |
|
|
|
if (info->params.flags & HDLC_FLAG_TXC_BRG) |
|
{ |
|
// when RxC source is DPLL, BRG generates 16X DPLL |
|
// reference clock, so take TxC from BRG/16 to get |
|
// transmit clock at actual data rate |
|
if (info->params.flags & HDLC_FLAG_RXC_DPLL) |
|
val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */ |
|
else |
|
val |= BIT6; /* 010, txclk = BRG */ |
|
} |
|
else if (info->params.flags & HDLC_FLAG_TXC_DPLL) |
|
val |= BIT7; /* 100, txclk = DPLL Input */ |
|
else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN) |
|
val |= BIT5; /* 001, txclk = RXC Input */ |
|
|
|
if (info->params.flags & HDLC_FLAG_RXC_BRG) |
|
val |= BIT3; /* 010, rxclk = BRG */ |
|
else if (info->params.flags & HDLC_FLAG_RXC_DPLL) |
|
val |= BIT4; /* 100, rxclk = DPLL */ |
|
else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN) |
|
val |= BIT2; /* 001, rxclk = TXC Input */ |
|
|
|
if (info->params.clock_speed) |
|
val |= BIT1 + BIT0; |
|
|
|
wr_reg8(info, CCR, (unsigned char)val); |
|
|
|
if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL)) |
|
{ |
|
// program DPLL mode |
|
switch(info->params.encoding) |
|
{ |
|
case HDLC_ENCODING_BIPHASE_MARK: |
|
case HDLC_ENCODING_BIPHASE_SPACE: |
|
val = BIT7; break; |
|
case HDLC_ENCODING_BIPHASE_LEVEL: |
|
case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: |
|
val = BIT7 + BIT6; break; |
|
default: val = BIT6; // NRZ encodings |
|
} |
|
wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val)); |
|
|
|
// DPLL requires a 16X reference clock from BRG |
|
set_rate(info, info->params.clock_speed * 16); |
|
} |
|
else |
|
set_rate(info, info->params.clock_speed); |
|
|
|
tx_set_idle(info); |
|
|
|
msc_set_vcr(info); |
|
|
|
/* SCR (serial control) |
|
* |
|
* 15 1=tx req on FIFO half empty |
|
* 14 1=rx req on FIFO half full |
|
* 13 tx data IRQ enable |
|
* 12 tx idle IRQ enable |
|
* 11 underrun IRQ enable |
|
* 10 rx data IRQ enable |
|
* 09 rx idle IRQ enable |
|
* 08 overrun IRQ enable |
|
* 07 DSR IRQ enable |
|
* 06 CTS IRQ enable |
|
* 05 DCD IRQ enable |
|
* 04 RI IRQ enable |
|
* 03 reserved, must be zero |
|
* 02 1=txd->rxd internal loopback enable |
|
* 01 reserved, must be zero |
|
* 00 1=master IRQ enable |
|
*/ |
|
wr_reg16(info, SCR, BIT15 + BIT14 + BIT0); |
|
|
|
if (info->params.loopback) |
|
enable_loopback(info); |
|
} |
|
|
|
/* |
|
* set transmit idle mode |
|
*/ |
|
static void tx_set_idle(struct slgt_info *info) |
|
{ |
|
unsigned char val; |
|
unsigned short tcr; |
|
|
|
/* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits |
|
* else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits |
|
*/ |
|
tcr = rd_reg16(info, TCR); |
|
if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) { |
|
/* disable preamble, set idle size to 16 bits */ |
|
tcr = (tcr & ~(BIT6 + BIT5)) | BIT4; |
|
/* MSB of 16 bit idle specified in tx preamble register (TPR) */ |
|
wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff)); |
|
} else if (!(tcr & BIT6)) { |
|
/* preamble is disabled, set idle size to 8 bits */ |
|
tcr &= ~(BIT5 + BIT4); |
|
} |
|
wr_reg16(info, TCR, tcr); |
|
|
|
if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) { |
|
/* LSB of custom tx idle specified in tx idle register */ |
|
val = (unsigned char)(info->idle_mode & 0xff); |
|
} else { |
|
/* standard 8 bit idle patterns */ |
|
switch(info->idle_mode) |
|
{ |
|
case HDLC_TXIDLE_FLAGS: val = 0x7e; break; |
|
case HDLC_TXIDLE_ALT_ZEROS_ONES: |
|
case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break; |
|
case HDLC_TXIDLE_ZEROS: |
|
case HDLC_TXIDLE_SPACE: val = 0x00; break; |
|
default: val = 0xff; |
|
} |
|
} |
|
|
|
wr_reg8(info, TIR, val); |
|
} |
|
|
|
/* |
|
* get state of V24 status (input) signals |
|
*/ |
|
static void get_gtsignals(struct slgt_info *info) |
|
{ |
|
unsigned short status = rd_reg16(info, SSR); |
|
|
|
/* clear all serial signals except RTS and DTR */ |
|
info->signals &= SerialSignal_RTS | SerialSignal_DTR; |
|
|
|
if (status & BIT3) |
|
info->signals |= SerialSignal_DSR; |
|
if (status & BIT2) |
|
info->signals |= SerialSignal_CTS; |
|
if (status & BIT1) |
|
info->signals |= SerialSignal_DCD; |
|
if (status & BIT0) |
|
info->signals |= SerialSignal_RI; |
|
} |
|
|
|
/* |
|
* set V.24 Control Register based on current configuration |
|
*/ |
|
static void msc_set_vcr(struct slgt_info *info) |
|
{ |
|
unsigned char val = 0; |
|
|
|
/* VCR (V.24 control) |
|
* |
|
* 07..04 serial IF select |
|
* 03 DTR |
|
* 02 RTS |
|
* 01 LL |
|
* 00 RL |
|
*/ |
|
|
|
switch(info->if_mode & MGSL_INTERFACE_MASK) |
|
{ |
|
case MGSL_INTERFACE_RS232: |
|
val |= BIT5; /* 0010 */ |
|
break; |
|
case MGSL_INTERFACE_V35: |
|
val |= BIT7 + BIT6 + BIT5; /* 1110 */ |
|
break; |
|
case MGSL_INTERFACE_RS422: |
|
val |= BIT6; /* 0100 */ |
|
break; |
|
} |
|
|
|
if (info->if_mode & MGSL_INTERFACE_MSB_FIRST) |
|
val |= BIT4; |
|
if (info->signals & SerialSignal_DTR) |
|
val |= BIT3; |
|
if (info->signals & SerialSignal_RTS) |
|
val |= BIT2; |
|
if (info->if_mode & MGSL_INTERFACE_LL) |
|
val |= BIT1; |
|
if (info->if_mode & MGSL_INTERFACE_RL) |
|
val |= BIT0; |
|
wr_reg8(info, VCR, val); |
|
} |
|
|
|
/* |
|
* set state of V24 control (output) signals |
|
*/ |
|
static void set_gtsignals(struct slgt_info *info) |
|
{ |
|
unsigned char val = rd_reg8(info, VCR); |
|
if (info->signals & SerialSignal_DTR) |
|
val |= BIT3; |
|
else |
|
val &= ~BIT3; |
|
if (info->signals & SerialSignal_RTS) |
|
val |= BIT2; |
|
else |
|
val &= ~BIT2; |
|
wr_reg8(info, VCR, val); |
|
} |
|
|
|
/* |
|
* free range of receive DMA buffers (i to last) |
|
*/ |
|
static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last) |
|
{ |
|
int done = 0; |
|
|
|
while(!done) { |
|
/* reset current buffer for reuse */ |
|
info->rbufs[i].status = 0; |
|
set_desc_count(info->rbufs[i], info->rbuf_fill_level); |
|
if (i == last) |
|
done = 1; |
|
if (++i == info->rbuf_count) |
|
i = 0; |
|
} |
|
info->rbuf_current = i; |
|
} |
|
|
|
/* |
|
* mark all receive DMA buffers as free |
|
*/ |
|
static void reset_rbufs(struct slgt_info *info) |
|
{ |
|
free_rbufs(info, 0, info->rbuf_count - 1); |
|
info->rbuf_fill_index = 0; |
|
info->rbuf_fill_count = 0; |
|
} |
|
|
|
/* |
|
* pass receive HDLC frame to upper layer |
|
* |
|
* return true if frame available, otherwise false |
|
*/ |
|
static bool rx_get_frame(struct slgt_info *info) |
|
{ |
|
unsigned int start, end; |
|
unsigned short status; |
|
unsigned int framesize = 0; |
|
unsigned long flags; |
|
struct tty_struct *tty = info->port.tty; |
|
unsigned char addr_field = 0xff; |
|
unsigned int crc_size = 0; |
|
|
|
switch (info->params.crc_type & HDLC_CRC_MASK) { |
|
case HDLC_CRC_16_CCITT: crc_size = 2; break; |
|
case HDLC_CRC_32_CCITT: crc_size = 4; break; |
|
} |
|
|
|
check_again: |
|
|
|
framesize = 0; |
|
addr_field = 0xff; |
|
start = end = info->rbuf_current; |
|
|
|
for (;;) { |
|
if (!desc_complete(info->rbufs[end])) |
|
goto cleanup; |
|
|
|
if (framesize == 0 && info->params.addr_filter != 0xff) |
|
addr_field = info->rbufs[end].buf[0]; |
|
|
|
framesize += desc_count(info->rbufs[end]); |
|
|
|
if (desc_eof(info->rbufs[end])) |
|
break; |
|
|
|
if (++end == info->rbuf_count) |
|
end = 0; |
|
|
|
if (end == info->rbuf_current) { |
|
if (info->rx_enabled){ |
|
spin_lock_irqsave(&info->lock,flags); |
|
rx_start(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
} |
|
goto cleanup; |
|
} |
|
} |
|
|
|
/* status |
|
* |
|
* 15 buffer complete |
|
* 14..06 reserved |
|
* 05..04 residue |
|
* 02 eof (end of frame) |
|
* 01 CRC error |
|
* 00 abort |
|
*/ |
|
status = desc_status(info->rbufs[end]); |
|
|
|
/* ignore CRC bit if not using CRC (bit is undefined) */ |
|
if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE) |
|
status &= ~BIT1; |
|
|
|
if (framesize == 0 || |
|
(addr_field != 0xff && addr_field != info->params.addr_filter)) { |
|
free_rbufs(info, start, end); |
|
goto check_again; |
|
} |
|
|
|
if (framesize < (2 + crc_size) || status & BIT0) { |
|
info->icount.rxshort++; |
|
framesize = 0; |
|
} else if (status & BIT1) { |
|
info->icount.rxcrc++; |
|
if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) |
|
framesize = 0; |
|
} |
|
|
|
#if SYNCLINK_GENERIC_HDLC |
|
if (framesize == 0) { |
|
info->netdev->stats.rx_errors++; |
|
info->netdev->stats.rx_frame_errors++; |
|
} |
|
#endif |
|
|
|
DBGBH(("%s rx frame status=%04X size=%d\n", |
|
info->device_name, status, framesize)); |
|
DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx"); |
|
|
|
if (framesize) { |
|
if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) { |
|
framesize -= crc_size; |
|
crc_size = 0; |
|
} |
|
|
|
if (framesize > info->max_frame_size + crc_size) |
|
info->icount.rxlong++; |
|
else { |
|
/* copy dma buffer(s) to contiguous temp buffer */ |
|
int copy_count = framesize; |
|
int i = start; |
|
unsigned char *p = info->tmp_rbuf; |
|
info->tmp_rbuf_count = framesize; |
|
|
|
info->icount.rxok++; |
|
|
|
while(copy_count) { |
|
int partial_count = min_t(int, copy_count, info->rbuf_fill_level); |
|
memcpy(p, info->rbufs[i].buf, partial_count); |
|
p += partial_count; |
|
copy_count -= partial_count; |
|
if (++i == info->rbuf_count) |
|
i = 0; |
|
} |
|
|
|
if (info->params.crc_type & HDLC_CRC_RETURN_EX) { |
|
*p = (status & BIT1) ? RX_CRC_ERROR : RX_OK; |
|
framesize++; |
|
} |
|
|
|
#if SYNCLINK_GENERIC_HDLC |
|
if (info->netcount) |
|
hdlcdev_rx(info,info->tmp_rbuf, framesize); |
|
else |
|
#endif |
|
ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize); |
|
} |
|
} |
|
free_rbufs(info, start, end); |
|
return true; |
|
|
|
cleanup: |
|
return false; |
|
} |
|
|
|
/* |
|
* pass receive buffer (RAW synchronous mode) to tty layer |
|
* return true if buffer available, otherwise false |
|
*/ |
|
static bool rx_get_buf(struct slgt_info *info) |
|
{ |
|
unsigned int i = info->rbuf_current; |
|
unsigned int count; |
|
|
|
if (!desc_complete(info->rbufs[i])) |
|
return false; |
|
count = desc_count(info->rbufs[i]); |
|
switch(info->params.mode) { |
|
case MGSL_MODE_MONOSYNC: |
|
case MGSL_MODE_BISYNC: |
|
case MGSL_MODE_XSYNC: |
|
/* ignore residue in byte synchronous modes */ |
|
if (desc_residue(info->rbufs[i])) |
|
count--; |
|
break; |
|
} |
|
DBGDATA(info, info->rbufs[i].buf, count, "rx"); |
|
DBGINFO(("rx_get_buf size=%d\n", count)); |
|
if (count) |
|
ldisc_receive_buf(info->port.tty, info->rbufs[i].buf, |
|
info->flag_buf, count); |
|
free_rbufs(info, i, i); |
|
return true; |
|
} |
|
|
|
static void reset_tbufs(struct slgt_info *info) |
|
{ |
|
unsigned int i; |
|
info->tbuf_current = 0; |
|
for (i=0 ; i < info->tbuf_count ; i++) { |
|
info->tbufs[i].status = 0; |
|
info->tbufs[i].count = 0; |
|
} |
|
} |
|
|
|
/* |
|
* return number of free transmit DMA buffers |
|
*/ |
|
static unsigned int free_tbuf_count(struct slgt_info *info) |
|
{ |
|
unsigned int count = 0; |
|
unsigned int i = info->tbuf_current; |
|
|
|
do |
|
{ |
|
if (desc_count(info->tbufs[i])) |
|
break; /* buffer in use */ |
|
++count; |
|
if (++i == info->tbuf_count) |
|
i=0; |
|
} while (i != info->tbuf_current); |
|
|
|
/* if tx DMA active, last zero count buffer is in use */ |
|
if (count && (rd_reg32(info, TDCSR) & BIT0)) |
|
--count; |
|
|
|
return count; |
|
} |
|
|
|
/* |
|
* return number of bytes in unsent transmit DMA buffers |
|
* and the serial controller tx FIFO |
|
*/ |
|
static unsigned int tbuf_bytes(struct slgt_info *info) |
|
{ |
|
unsigned int total_count = 0; |
|
unsigned int i = info->tbuf_current; |
|
unsigned int reg_value; |
|
unsigned int count; |
|
unsigned int active_buf_count = 0; |
|
|
|
/* |
|
* Add descriptor counts for all tx DMA buffers. |
|
* If count is zero (cleared by DMA controller after read), |
|
* the buffer is complete or is actively being read from. |
|
* |
|
* Record buf_count of last buffer with zero count starting |
|
* from current ring position. buf_count is mirror |
|
* copy of count and is not cleared by serial controller. |
|
* If DMA controller is active, that buffer is actively |
|
* being read so add to total. |
|
*/ |
|
do { |
|
count = desc_count(info->tbufs[i]); |
|
if (count) |
|
total_count += count; |
|
else if (!total_count) |
|
active_buf_count = info->tbufs[i].buf_count; |
|
if (++i == info->tbuf_count) |
|
i = 0; |
|
} while (i != info->tbuf_current); |
|
|
|
/* read tx DMA status register */ |
|
reg_value = rd_reg32(info, TDCSR); |
|
|
|
/* if tx DMA active, last zero count buffer is in use */ |
|
if (reg_value & BIT0) |
|
total_count += active_buf_count; |
|
|
|
/* add tx FIFO count = reg_value[15..8] */ |
|
total_count += (reg_value >> 8) & 0xff; |
|
|
|
/* if transmitter active add one byte for shift register */ |
|
if (info->tx_active) |
|
total_count++; |
|
|
|
return total_count; |
|
} |
|
|
|
/* |
|
* load data into transmit DMA buffer ring and start transmitter if needed |
|
* return true if data accepted, otherwise false (buffers full) |
|
*/ |
|
static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size) |
|
{ |
|
unsigned short count; |
|
unsigned int i; |
|
struct slgt_desc *d; |
|
|
|
/* check required buffer space */ |
|
if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info)) |
|
return false; |
|
|
|
DBGDATA(info, buf, size, "tx"); |
|
|
|
/* |
|
* copy data to one or more DMA buffers in circular ring |
|
* tbuf_start = first buffer for this data |
|
* tbuf_current = next free buffer |
|
* |
|
* Copy all data before making data visible to DMA controller by |
|
* setting descriptor count of the first buffer. |
|
* This prevents an active DMA controller from reading the first DMA |
|
* buffers of a frame and stopping before the final buffers are filled. |
|
*/ |
|
|
|
info->tbuf_start = i = info->tbuf_current; |
|
|
|
while (size) { |
|
d = &info->tbufs[i]; |
|
|
|
count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size); |
|
memcpy(d->buf, buf, count); |
|
|
|
size -= count; |
|
buf += count; |
|
|
|
/* |
|
* set EOF bit for last buffer of HDLC frame or |
|
* for every buffer in raw mode |
|
*/ |
|
if ((!size && info->params.mode == MGSL_MODE_HDLC) || |
|
info->params.mode == MGSL_MODE_RAW) |
|
set_desc_eof(*d, 1); |
|
else |
|
set_desc_eof(*d, 0); |
|
|
|
/* set descriptor count for all but first buffer */ |
|
if (i != info->tbuf_start) |
|
set_desc_count(*d, count); |
|
d->buf_count = count; |
|
|
|
if (++i == info->tbuf_count) |
|
i = 0; |
|
} |
|
|
|
info->tbuf_current = i; |
|
|
|
/* set first buffer count to make new data visible to DMA controller */ |
|
d = &info->tbufs[info->tbuf_start]; |
|
set_desc_count(*d, d->buf_count); |
|
|
|
/* start transmitter if needed and update transmit timeout */ |
|
if (!info->tx_active) |
|
tx_start(info); |
|
update_tx_timer(info); |
|
|
|
return true; |
|
} |
|
|
|
static int register_test(struct slgt_info *info) |
|
{ |
|
static unsigned short patterns[] = |
|
{0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696}; |
|
static unsigned int count = ARRAY_SIZE(patterns); |
|
unsigned int i; |
|
int rc = 0; |
|
|
|
for (i=0 ; i < count ; i++) { |
|
wr_reg16(info, TIR, patterns[i]); |
|
wr_reg16(info, BDR, patterns[(i+1)%count]); |
|
if ((rd_reg16(info, TIR) != patterns[i]) || |
|
(rd_reg16(info, BDR) != patterns[(i+1)%count])) { |
|
rc = -ENODEV; |
|
break; |
|
} |
|
} |
|
info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0; |
|
info->init_error = rc ? 0 : DiagStatus_AddressFailure; |
|
return rc; |
|
} |
|
|
|
static int irq_test(struct slgt_info *info) |
|
{ |
|
unsigned long timeout; |
|
unsigned long flags; |
|
struct tty_struct *oldtty = info->port.tty; |
|
u32 speed = info->params.data_rate; |
|
|
|
info->params.data_rate = 921600; |
|
info->port.tty = NULL; |
|
|
|
spin_lock_irqsave(&info->lock, flags); |
|
async_mode(info); |
|
slgt_irq_on(info, IRQ_TXIDLE); |
|
|
|
/* enable transmitter */ |
|
wr_reg16(info, TCR, |
|
(unsigned short)(rd_reg16(info, TCR) | BIT1)); |
|
|
|
/* write one byte and wait for tx idle */ |
|
wr_reg16(info, TDR, 0); |
|
|
|
/* assume failure */ |
|
info->init_error = DiagStatus_IrqFailure; |
|
info->irq_occurred = false; |
|
|
|
spin_unlock_irqrestore(&info->lock, flags); |
|
|
|
timeout=100; |
|
while(timeout-- && !info->irq_occurred) |
|
msleep_interruptible(10); |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
reset_port(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
info->params.data_rate = speed; |
|
info->port.tty = oldtty; |
|
|
|
info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure; |
|
return info->irq_occurred ? 0 : -ENODEV; |
|
} |
|
|
|
static int loopback_test_rx(struct slgt_info *info) |
|
{ |
|
unsigned char *src, *dest; |
|
int count; |
|
|
|
if (desc_complete(info->rbufs[0])) { |
|
count = desc_count(info->rbufs[0]); |
|
src = info->rbufs[0].buf; |
|
dest = info->tmp_rbuf; |
|
|
|
for( ; count ; count-=2, src+=2) { |
|
/* src=data byte (src+1)=status byte */ |
|
if (!(*(src+1) & (BIT9 + BIT8))) { |
|
*dest = *src; |
|
dest++; |
|
info->tmp_rbuf_count++; |
|
} |
|
} |
|
DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx"); |
|
return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
static int loopback_test(struct slgt_info *info) |
|
{ |
|
#define TESTFRAMESIZE 20 |
|
|
|
unsigned long timeout; |
|
u16 count; |
|
unsigned char buf[TESTFRAMESIZE]; |
|
int rc = -ENODEV; |
|
unsigned long flags; |
|
|
|
struct tty_struct *oldtty = info->port.tty; |
|
MGSL_PARAMS params; |
|
|
|
memcpy(¶ms, &info->params, sizeof(params)); |
|
|
|
info->params.mode = MGSL_MODE_ASYNC; |
|
info->params.data_rate = 921600; |
|
info->params.loopback = 1; |
|
info->port.tty = NULL; |
|
|
|
/* build and send transmit frame */ |
|
for (count = 0; count < TESTFRAMESIZE; ++count) |
|
buf[count] = (unsigned char)count; |
|
|
|
info->tmp_rbuf_count = 0; |
|
memset(info->tmp_rbuf, 0, TESTFRAMESIZE); |
|
|
|
/* program hardware for HDLC and enabled receiver */ |
|
spin_lock_irqsave(&info->lock,flags); |
|
async_mode(info); |
|
rx_start(info); |
|
tx_load(info, buf, count); |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
|
|
/* wait for receive complete */ |
|
for (timeout = 100; timeout; --timeout) { |
|
msleep_interruptible(10); |
|
if (loopback_test_rx(info)) { |
|
rc = 0; |
|
break; |
|
} |
|
} |
|
|
|
/* verify received frame length and contents */ |
|
if (!rc && (info->tmp_rbuf_count != count || |
|
memcmp(buf, info->tmp_rbuf, count))) { |
|
rc = -ENODEV; |
|
} |
|
|
|
spin_lock_irqsave(&info->lock,flags); |
|
reset_adapter(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
memcpy(&info->params, ¶ms, sizeof(info->params)); |
|
info->port.tty = oldtty; |
|
|
|
info->init_error = rc ? DiagStatus_DmaFailure : 0; |
|
return rc; |
|
} |
|
|
|
static int adapter_test(struct slgt_info *info) |
|
{ |
|
DBGINFO(("testing %s\n", info->device_name)); |
|
if (register_test(info) < 0) { |
|
printk("register test failure %s addr=%08X\n", |
|
info->device_name, info->phys_reg_addr); |
|
} else if (irq_test(info) < 0) { |
|
printk("IRQ test failure %s IRQ=%d\n", |
|
info->device_name, info->irq_level); |
|
} else if (loopback_test(info) < 0) { |
|
printk("loopback test failure %s\n", info->device_name); |
|
} |
|
return info->init_error; |
|
} |
|
|
|
/* |
|
* transmit timeout handler |
|
*/ |
|
static void tx_timeout(struct timer_list *t) |
|
{ |
|
struct slgt_info *info = from_timer(info, t, tx_timer); |
|
unsigned long flags; |
|
|
|
DBGINFO(("%s tx_timeout\n", info->device_name)); |
|
if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) { |
|
info->icount.txtimeout++; |
|
} |
|
spin_lock_irqsave(&info->lock,flags); |
|
tx_stop(info); |
|
spin_unlock_irqrestore(&info->lock,flags); |
|
|
|
#if SYNCLINK_GENERIC_HDLC |
|
if (info->netcount) |
|
hdlcdev_tx_done(info); |
|
else |
|
#endif |
|
bh_transmit(info); |
|
} |
|
|
|
/* |
|
* receive buffer polling timer |
|
*/ |
|
static void rx_timeout(struct timer_list *t) |
|
{ |
|
struct slgt_info *info = from_timer(info, t, rx_timer); |
|
unsigned long flags; |
|
|
|
DBGINFO(("%s rx_timeout\n", info->device_name)); |
|
spin_lock_irqsave(&info->lock, flags); |
|
info->pending_bh |= BH_RECEIVE; |
|
spin_unlock_irqrestore(&info->lock, flags); |
|
bh_handler(&info->task); |
|
} |
|
|
|
|