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1165 lines
26 KiB
1165 lines
26 KiB
/* ppa.c -- low level driver for the IOMEGA PPA3 |
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* parallel port SCSI host adapter. |
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* |
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* (The PPA3 is the embedded controller in the ZIP drive.) |
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* |
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* (c) 1995,1996 Grant R. Guenther, [email protected], |
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* under the terms of the GNU General Public License. |
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* |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/blkdev.h> |
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#include <linux/parport.h> |
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#include <linux/workqueue.h> |
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#include <linux/delay.h> |
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#include <linux/jiffies.h> |
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#include <asm/io.h> |
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#include <scsi/scsi.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_host.h> |
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static void ppa_reset_pulse(unsigned int base); |
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typedef struct { |
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struct pardevice *dev; /* Parport device entry */ |
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int base; /* Actual port address */ |
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int mode; /* Transfer mode */ |
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struct scsi_cmnd *cur_cmd; /* Current queued command */ |
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struct delayed_work ppa_tq; /* Polling interrupt stuff */ |
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unsigned long jstart; /* Jiffies at start */ |
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unsigned long recon_tmo; /* How many usecs to wait for reconnection (6th bit) */ |
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unsigned int failed:1; /* Failure flag */ |
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unsigned wanted:1; /* Parport sharing busy flag */ |
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unsigned int dev_no; /* Device number */ |
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wait_queue_head_t *waiting; |
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struct Scsi_Host *host; |
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struct list_head list; |
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} ppa_struct; |
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#include "ppa.h" |
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static inline ppa_struct *ppa_dev(struct Scsi_Host *host) |
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{ |
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return *(ppa_struct **)&host->hostdata; |
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} |
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static DEFINE_SPINLOCK(arbitration_lock); |
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static void got_it(ppa_struct *dev) |
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{ |
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dev->base = dev->dev->port->base; |
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if (dev->cur_cmd) |
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dev->cur_cmd->SCp.phase = 1; |
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else |
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wake_up(dev->waiting); |
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} |
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static void ppa_wakeup(void *ref) |
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{ |
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ppa_struct *dev = (ppa_struct *) ref; |
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unsigned long flags; |
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spin_lock_irqsave(&arbitration_lock, flags); |
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if (dev->wanted) { |
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parport_claim(dev->dev); |
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got_it(dev); |
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dev->wanted = 0; |
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} |
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spin_unlock_irqrestore(&arbitration_lock, flags); |
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return; |
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} |
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static int ppa_pb_claim(ppa_struct *dev) |
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{ |
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unsigned long flags; |
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int res = 1; |
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spin_lock_irqsave(&arbitration_lock, flags); |
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if (parport_claim(dev->dev) == 0) { |
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got_it(dev); |
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res = 0; |
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} |
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dev->wanted = res; |
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spin_unlock_irqrestore(&arbitration_lock, flags); |
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return res; |
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} |
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static void ppa_pb_dismiss(ppa_struct *dev) |
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{ |
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unsigned long flags; |
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int wanted; |
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spin_lock_irqsave(&arbitration_lock, flags); |
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wanted = dev->wanted; |
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dev->wanted = 0; |
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spin_unlock_irqrestore(&arbitration_lock, flags); |
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if (!wanted) |
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parport_release(dev->dev); |
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} |
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static inline void ppa_pb_release(ppa_struct *dev) |
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{ |
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parport_release(dev->dev); |
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} |
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/* |
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* Start of Chipset kludges |
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*/ |
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|
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/* This is to give the ppa driver a way to modify the timings (and other |
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* parameters) by writing to the /proc/scsi/ppa/0 file. |
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* Very simple method really... (To simple, no error checking :( ) |
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* Reason: Kernel hackers HATE having to unload and reload modules for |
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* testing... |
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* Also gives a method to use a script to obtain optimum timings (TODO) |
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*/ |
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static inline int ppa_write_info(struct Scsi_Host *host, char *buffer, int length) |
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{ |
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ppa_struct *dev = ppa_dev(host); |
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unsigned long x; |
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if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) { |
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x = simple_strtoul(buffer + 5, NULL, 0); |
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dev->mode = x; |
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return length; |
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} |
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if ((length > 10) && (strncmp(buffer, "recon_tmo=", 10) == 0)) { |
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x = simple_strtoul(buffer + 10, NULL, 0); |
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dev->recon_tmo = x; |
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printk(KERN_INFO "ppa: recon_tmo set to %ld\n", x); |
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return length; |
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} |
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printk(KERN_WARNING "ppa /proc: invalid variable\n"); |
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return -EINVAL; |
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} |
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static int ppa_show_info(struct seq_file *m, struct Scsi_Host *host) |
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{ |
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ppa_struct *dev = ppa_dev(host); |
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seq_printf(m, "Version : %s\n", PPA_VERSION); |
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seq_printf(m, "Parport : %s\n", dev->dev->port->name); |
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seq_printf(m, "Mode : %s\n", PPA_MODE_STRING[dev->mode]); |
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#if PPA_DEBUG > 0 |
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seq_printf(m, "recon_tmo : %lu\n", dev->recon_tmo); |
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#endif |
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return 0; |
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} |
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static int device_check(ppa_struct *dev); |
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#if PPA_DEBUG > 0 |
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#define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\ |
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y, __func__, __LINE__); ppa_fail_func(x,y); |
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static inline void ppa_fail_func(ppa_struct *dev, int error_code) |
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#else |
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static inline void ppa_fail(ppa_struct *dev, int error_code) |
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#endif |
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{ |
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/* If we fail a device then we trash status / message bytes */ |
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if (dev->cur_cmd) { |
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dev->cur_cmd->result = error_code << 16; |
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dev->failed = 1; |
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} |
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} |
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/* |
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* Wait for the high bit to be set. |
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* |
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* In principle, this could be tied to an interrupt, but the adapter |
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* doesn't appear to be designed to support interrupts. We spin on |
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* the 0x80 ready bit. |
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*/ |
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static unsigned char ppa_wait(ppa_struct *dev) |
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{ |
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int k; |
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unsigned short ppb = dev->base; |
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unsigned char r; |
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k = PPA_SPIN_TMO; |
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/* Wait for bit 6 and 7 - PJC */ |
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for (r = r_str(ppb); ((r & 0xc0) != 0xc0) && (k); k--) { |
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udelay(1); |
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r = r_str(ppb); |
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} |
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/* |
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* return some status information. |
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* Semantics: 0xc0 = ZIP wants more data |
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* 0xd0 = ZIP wants to send more data |
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* 0xe0 = ZIP is expecting SCSI command data |
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* 0xf0 = end of transfer, ZIP is sending status |
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*/ |
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if (k) |
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return (r & 0xf0); |
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/* Counter expired - Time out occurred */ |
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ppa_fail(dev, DID_TIME_OUT); |
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printk(KERN_WARNING "ppa timeout in ppa_wait\n"); |
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return 0; /* command timed out */ |
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} |
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/* |
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* Clear EPP Timeout Bit |
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*/ |
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static inline void epp_reset(unsigned short ppb) |
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{ |
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int i; |
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i = r_str(ppb); |
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w_str(ppb, i); |
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w_str(ppb, i & 0xfe); |
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} |
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/* |
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* Wait for empty ECP fifo (if we are in ECP fifo mode only) |
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*/ |
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static inline void ecp_sync(ppa_struct *dev) |
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{ |
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int i, ppb_hi = dev->dev->port->base_hi; |
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if (ppb_hi == 0) |
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return; |
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if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ |
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for (i = 0; i < 100; i++) { |
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if (r_ecr(ppb_hi) & 0x01) |
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return; |
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udelay(5); |
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} |
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printk(KERN_WARNING "ppa: ECP sync failed as data still present in FIFO.\n"); |
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} |
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} |
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static int ppa_byte_out(unsigned short base, const char *buffer, int len) |
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{ |
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int i; |
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for (i = len; i; i--) { |
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w_dtr(base, *buffer++); |
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w_ctr(base, 0xe); |
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w_ctr(base, 0xc); |
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} |
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return 1; /* All went well - we hope! */ |
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} |
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static int ppa_byte_in(unsigned short base, char *buffer, int len) |
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{ |
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int i; |
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for (i = len; i; i--) { |
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*buffer++ = r_dtr(base); |
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w_ctr(base, 0x27); |
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w_ctr(base, 0x25); |
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} |
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return 1; /* All went well - we hope! */ |
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} |
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static int ppa_nibble_in(unsigned short base, char *buffer, int len) |
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{ |
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for (; len; len--) { |
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unsigned char h; |
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w_ctr(base, 0x4); |
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h = r_str(base) & 0xf0; |
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w_ctr(base, 0x6); |
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*buffer++ = h | ((r_str(base) & 0xf0) >> 4); |
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} |
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return 1; /* All went well - we hope! */ |
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} |
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static int ppa_out(ppa_struct *dev, char *buffer, int len) |
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{ |
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int r; |
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unsigned short ppb = dev->base; |
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r = ppa_wait(dev); |
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if ((r & 0x50) != 0x40) { |
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ppa_fail(dev, DID_ERROR); |
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return 0; |
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} |
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switch (dev->mode) { |
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case PPA_NIBBLE: |
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case PPA_PS2: |
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/* 8 bit output, with a loop */ |
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r = ppa_byte_out(ppb, buffer, len); |
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break; |
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case PPA_EPP_32: |
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case PPA_EPP_16: |
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case PPA_EPP_8: |
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epp_reset(ppb); |
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w_ctr(ppb, 0x4); |
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#ifdef CONFIG_SCSI_IZIP_EPP16 |
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if (!(((long) buffer | len) & 0x01)) |
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outsw(ppb + 4, buffer, len >> 1); |
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#else |
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if (!(((long) buffer | len) & 0x03)) |
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outsl(ppb + 4, buffer, len >> 2); |
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#endif |
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else |
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outsb(ppb + 4, buffer, len); |
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w_ctr(ppb, 0xc); |
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r = !(r_str(ppb) & 0x01); |
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w_ctr(ppb, 0xc); |
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ecp_sync(dev); |
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break; |
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default: |
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printk(KERN_ERR "PPA: bug in ppa_out()\n"); |
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r = 0; |
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} |
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return r; |
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} |
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static int ppa_in(ppa_struct *dev, char *buffer, int len) |
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{ |
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int r; |
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unsigned short ppb = dev->base; |
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r = ppa_wait(dev); |
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if ((r & 0x50) != 0x50) { |
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ppa_fail(dev, DID_ERROR); |
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return 0; |
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} |
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switch (dev->mode) { |
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case PPA_NIBBLE: |
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/* 4 bit input, with a loop */ |
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r = ppa_nibble_in(ppb, buffer, len); |
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w_ctr(ppb, 0xc); |
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break; |
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case PPA_PS2: |
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/* 8 bit input, with a loop */ |
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w_ctr(ppb, 0x25); |
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r = ppa_byte_in(ppb, buffer, len); |
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w_ctr(ppb, 0x4); |
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w_ctr(ppb, 0xc); |
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break; |
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case PPA_EPP_32: |
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case PPA_EPP_16: |
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case PPA_EPP_8: |
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epp_reset(ppb); |
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w_ctr(ppb, 0x24); |
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#ifdef CONFIG_SCSI_IZIP_EPP16 |
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if (!(((long) buffer | len) & 0x01)) |
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insw(ppb + 4, buffer, len >> 1); |
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#else |
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if (!(((long) buffer | len) & 0x03)) |
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insl(ppb + 4, buffer, len >> 2); |
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#endif |
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else |
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insb(ppb + 4, buffer, len); |
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w_ctr(ppb, 0x2c); |
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r = !(r_str(ppb) & 0x01); |
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w_ctr(ppb, 0x2c); |
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ecp_sync(dev); |
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break; |
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default: |
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printk(KERN_ERR "PPA: bug in ppa_ins()\n"); |
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r = 0; |
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break; |
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} |
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return r; |
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} |
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/* end of ppa_io.h */ |
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static inline void ppa_d_pulse(unsigned short ppb, unsigned char b) |
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{ |
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w_dtr(ppb, b); |
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w_ctr(ppb, 0xc); |
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w_ctr(ppb, 0xe); |
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w_ctr(ppb, 0xc); |
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w_ctr(ppb, 0x4); |
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w_ctr(ppb, 0xc); |
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} |
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static void ppa_disconnect(ppa_struct *dev) |
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{ |
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unsigned short ppb = dev->base; |
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ppa_d_pulse(ppb, 0); |
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ppa_d_pulse(ppb, 0x3c); |
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ppa_d_pulse(ppb, 0x20); |
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ppa_d_pulse(ppb, 0xf); |
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} |
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static inline void ppa_c_pulse(unsigned short ppb, unsigned char b) |
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{ |
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w_dtr(ppb, b); |
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w_ctr(ppb, 0x4); |
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w_ctr(ppb, 0x6); |
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w_ctr(ppb, 0x4); |
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w_ctr(ppb, 0xc); |
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} |
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static inline void ppa_connect(ppa_struct *dev, int flag) |
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{ |
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unsigned short ppb = dev->base; |
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ppa_c_pulse(ppb, 0); |
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ppa_c_pulse(ppb, 0x3c); |
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ppa_c_pulse(ppb, 0x20); |
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if ((flag == CONNECT_EPP_MAYBE) && IN_EPP_MODE(dev->mode)) |
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ppa_c_pulse(ppb, 0xcf); |
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else |
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ppa_c_pulse(ppb, 0x8f); |
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} |
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static int ppa_select(ppa_struct *dev, int target) |
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{ |
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int k; |
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unsigned short ppb = dev->base; |
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/* |
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* Bit 6 (0x40) is the device selected bit. |
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* First we must wait till the current device goes off line... |
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*/ |
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k = PPA_SELECT_TMO; |
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do { |
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k--; |
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udelay(1); |
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} while ((r_str(ppb) & 0x40) && (k)); |
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if (!k) |
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return 0; |
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w_dtr(ppb, (1 << target)); |
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w_ctr(ppb, 0xe); |
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w_ctr(ppb, 0xc); |
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w_dtr(ppb, 0x80); /* This is NOT the initator */ |
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w_ctr(ppb, 0x8); |
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k = PPA_SELECT_TMO; |
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do { |
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k--; |
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udelay(1); |
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} |
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while (!(r_str(ppb) & 0x40) && (k)); |
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if (!k) |
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return 0; |
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return 1; |
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} |
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/* |
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* This is based on a trace of what the Iomega DOS 'guest' driver does. |
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* I've tried several different kinds of parallel ports with guest and |
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* coded this to react in the same ways that it does. |
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* |
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* The return value from this function is just a hint about where the |
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* handshaking failed. |
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* |
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*/ |
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static int ppa_init(ppa_struct *dev) |
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{ |
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int retv; |
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unsigned short ppb = dev->base; |
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ppa_disconnect(dev); |
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ppa_connect(dev, CONNECT_NORMAL); |
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retv = 2; /* Failed */ |
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w_ctr(ppb, 0xe); |
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if ((r_str(ppb) & 0x08) == 0x08) |
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retv--; |
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w_ctr(ppb, 0xc); |
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if ((r_str(ppb) & 0x08) == 0x00) |
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retv--; |
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if (!retv) |
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ppa_reset_pulse(ppb); |
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udelay(1000); /* Allow devices to settle down */ |
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ppa_disconnect(dev); |
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udelay(1000); /* Another delay to allow devices to settle */ |
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|
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if (retv) |
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return -EIO; |
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|
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return device_check(dev); |
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} |
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static inline int ppa_send_command(struct scsi_cmnd *cmd) |
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{ |
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ppa_struct *dev = ppa_dev(cmd->device->host); |
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int k; |
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|
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w_ctr(dev->base, 0x0c); |
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|
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for (k = 0; k < cmd->cmd_len; k++) |
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if (!ppa_out(dev, &cmd->cmnd[k], 1)) |
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return 0; |
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return 1; |
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} |
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|
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/* |
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* The bulk flag enables some optimisations in the data transfer loops, |
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* it should be true for any command that transfers data in integral |
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* numbers of sectors. |
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* |
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* The driver appears to remain stable if we speed up the parallel port |
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* i/o in this function, but not elsewhere. |
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*/ |
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static int ppa_completion(struct scsi_cmnd *cmd) |
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{ |
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/* Return codes: |
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* -1 Error |
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* 0 Told to schedule |
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* 1 Finished data transfer |
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*/ |
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ppa_struct *dev = ppa_dev(cmd->device->host); |
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unsigned short ppb = dev->base; |
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unsigned long start_jiffies = jiffies; |
|
|
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unsigned char r, v; |
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int fast, bulk, status; |
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|
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v = cmd->cmnd[0]; |
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bulk = ((v == READ_6) || |
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(v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); |
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|
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/* |
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* We only get here if the drive is ready to comunicate, |
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* hence no need for a full ppa_wait. |
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*/ |
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r = (r_str(ppb) & 0xf0); |
|
|
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while (r != (unsigned char) 0xf0) { |
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/* |
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* If we have been running for more than a full timer tick |
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* then take a rest. |
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*/ |
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if (time_after(jiffies, start_jiffies + 1)) |
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return 0; |
|
|
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if ((cmd->SCp.this_residual <= 0)) { |
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ppa_fail(dev, DID_ERROR); |
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return -1; /* ERROR_RETURN */ |
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} |
|
|
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/* On some hardware we have SCSI disconnected (6th bit low) |
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* for about 100usecs. It is too expensive to wait a |
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* tick on every loop so we busy wait for no more than |
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* 500usecs to give the drive a chance first. We do not |
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* change things for "normal" hardware since generally |
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* the 6th bit is always high. |
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* This makes the CPU load higher on some hardware |
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* but otherwise we can not get more than 50K/secs |
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* on this problem hardware. |
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*/ |
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if ((r & 0xc0) != 0xc0) { |
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/* Wait for reconnection should be no more than |
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* jiffy/2 = 5ms = 5000 loops |
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*/ |
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unsigned long k = dev->recon_tmo; |
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for (; k && ((r = (r_str(ppb) & 0xf0)) & 0xc0) != 0xc0; |
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k--) |
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udelay(1); |
|
|
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if (!k) |
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return 0; |
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} |
|
|
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/* determine if we should use burst I/O */ |
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fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE)) |
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? PPA_BURST_SIZE : 1; |
|
|
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if (r == (unsigned char) 0xc0) |
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status = ppa_out(dev, cmd->SCp.ptr, fast); |
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else |
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status = ppa_in(dev, cmd->SCp.ptr, fast); |
|
|
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cmd->SCp.ptr += fast; |
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cmd->SCp.this_residual -= fast; |
|
|
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if (!status) { |
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ppa_fail(dev, DID_BUS_BUSY); |
|
return -1; /* ERROR_RETURN */ |
|
} |
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if (cmd->SCp.buffer && !cmd->SCp.this_residual) { |
|
/* if scatter/gather, advance to the next segment */ |
|
if (cmd->SCp.buffers_residual--) { |
|
cmd->SCp.buffer = sg_next(cmd->SCp.buffer); |
|
cmd->SCp.this_residual = |
|
cmd->SCp.buffer->length; |
|
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
|
} |
|
} |
|
/* Now check to see if the drive is ready to comunicate */ |
|
r = (r_str(ppb) & 0xf0); |
|
/* If not, drop back down to the scheduler and wait a timer tick */ |
|
if (!(r & 0x80)) |
|
return 0; |
|
} |
|
return 1; /* FINISH_RETURN */ |
|
} |
|
|
|
/* |
|
* Since the PPA itself doesn't generate interrupts, we use |
|
* the scheduler's task queue to generate a stream of call-backs and |
|
* complete the request when the drive is ready. |
|
*/ |
|
static void ppa_interrupt(struct work_struct *work) |
|
{ |
|
ppa_struct *dev = container_of(work, ppa_struct, ppa_tq.work); |
|
struct scsi_cmnd *cmd = dev->cur_cmd; |
|
|
|
if (!cmd) { |
|
printk(KERN_ERR "PPA: bug in ppa_interrupt\n"); |
|
return; |
|
} |
|
if (ppa_engine(dev, cmd)) { |
|
schedule_delayed_work(&dev->ppa_tq, 1); |
|
return; |
|
} |
|
/* Command must of completed hence it is safe to let go... */ |
|
#if PPA_DEBUG > 0 |
|
switch ((cmd->result >> 16) & 0xff) { |
|
case DID_OK: |
|
break; |
|
case DID_NO_CONNECT: |
|
printk(KERN_DEBUG "ppa: no device at SCSI ID %i\n", cmd->device->target); |
|
break; |
|
case DID_BUS_BUSY: |
|
printk(KERN_DEBUG "ppa: BUS BUSY - EPP timeout detected\n"); |
|
break; |
|
case DID_TIME_OUT: |
|
printk(KERN_DEBUG "ppa: unknown timeout\n"); |
|
break; |
|
case DID_ABORT: |
|
printk(KERN_DEBUG "ppa: told to abort\n"); |
|
break; |
|
case DID_PARITY: |
|
printk(KERN_DEBUG "ppa: parity error (???)\n"); |
|
break; |
|
case DID_ERROR: |
|
printk(KERN_DEBUG "ppa: internal driver error\n"); |
|
break; |
|
case DID_RESET: |
|
printk(KERN_DEBUG "ppa: told to reset device\n"); |
|
break; |
|
case DID_BAD_INTR: |
|
printk(KERN_WARNING "ppa: bad interrupt (???)\n"); |
|
break; |
|
default: |
|
printk(KERN_WARNING "ppa: bad return code (%02x)\n", |
|
(cmd->result >> 16) & 0xff); |
|
} |
|
#endif |
|
|
|
if (cmd->SCp.phase > 1) |
|
ppa_disconnect(dev); |
|
|
|
ppa_pb_dismiss(dev); |
|
|
|
dev->cur_cmd = NULL; |
|
|
|
cmd->scsi_done(cmd); |
|
} |
|
|
|
static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd) |
|
{ |
|
unsigned short ppb = dev->base; |
|
unsigned char l = 0, h = 0; |
|
int retv; |
|
|
|
/* First check for any errors that may of occurred |
|
* Here we check for internal errors |
|
*/ |
|
if (dev->failed) |
|
return 0; |
|
|
|
switch (cmd->SCp.phase) { |
|
case 0: /* Phase 0 - Waiting for parport */ |
|
if (time_after(jiffies, dev->jstart + HZ)) { |
|
/* |
|
* We waited more than a second |
|
* for parport to call us |
|
*/ |
|
ppa_fail(dev, DID_BUS_BUSY); |
|
return 0; |
|
} |
|
return 1; /* wait until ppa_wakeup claims parport */ |
|
case 1: /* Phase 1 - Connected */ |
|
{ /* Perform a sanity check for cable unplugged */ |
|
int retv = 2; /* Failed */ |
|
|
|
ppa_connect(dev, CONNECT_EPP_MAYBE); |
|
|
|
w_ctr(ppb, 0xe); |
|
if ((r_str(ppb) & 0x08) == 0x08) |
|
retv--; |
|
|
|
w_ctr(ppb, 0xc); |
|
if ((r_str(ppb) & 0x08) == 0x00) |
|
retv--; |
|
|
|
if (retv) { |
|
if (time_after(jiffies, dev->jstart + (1 * HZ))) { |
|
printk(KERN_ERR "ppa: Parallel port cable is unplugged.\n"); |
|
ppa_fail(dev, DID_BUS_BUSY); |
|
return 0; |
|
} else { |
|
ppa_disconnect(dev); |
|
return 1; /* Try again in a jiffy */ |
|
} |
|
} |
|
cmd->SCp.phase++; |
|
} |
|
fallthrough; |
|
|
|
case 2: /* Phase 2 - We are now talking to the scsi bus */ |
|
if (!ppa_select(dev, scmd_id(cmd))) { |
|
ppa_fail(dev, DID_NO_CONNECT); |
|
return 0; |
|
} |
|
cmd->SCp.phase++; |
|
fallthrough; |
|
|
|
case 3: /* Phase 3 - Ready to accept a command */ |
|
w_ctr(ppb, 0x0c); |
|
if (!(r_str(ppb) & 0x80)) |
|
return 1; |
|
|
|
if (!ppa_send_command(cmd)) |
|
return 0; |
|
cmd->SCp.phase++; |
|
fallthrough; |
|
|
|
case 4: /* Phase 4 - Setup scatter/gather buffers */ |
|
if (scsi_bufflen(cmd)) { |
|
cmd->SCp.buffer = scsi_sglist(cmd); |
|
cmd->SCp.this_residual = cmd->SCp.buffer->length; |
|
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |
|
} else { |
|
cmd->SCp.buffer = NULL; |
|
cmd->SCp.this_residual = 0; |
|
cmd->SCp.ptr = NULL; |
|
} |
|
cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; |
|
cmd->SCp.phase++; |
|
fallthrough; |
|
|
|
case 5: /* Phase 5 - Data transfer stage */ |
|
w_ctr(ppb, 0x0c); |
|
if (!(r_str(ppb) & 0x80)) |
|
return 1; |
|
|
|
retv = ppa_completion(cmd); |
|
if (retv == -1) |
|
return 0; |
|
if (retv == 0) |
|
return 1; |
|
cmd->SCp.phase++; |
|
fallthrough; |
|
|
|
case 6: /* Phase 6 - Read status/message */ |
|
cmd->result = DID_OK << 16; |
|
/* Check for data overrun */ |
|
if (ppa_wait(dev) != (unsigned char) 0xf0) { |
|
ppa_fail(dev, DID_ERROR); |
|
return 0; |
|
} |
|
if (ppa_in(dev, &l, 1)) { /* read status byte */ |
|
/* Check for optional message byte */ |
|
if (ppa_wait(dev) == (unsigned char) 0xf0) |
|
ppa_in(dev, &h, 1); |
|
cmd->result = |
|
(DID_OK << 16) + (h << 8) + (l & STATUS_MASK); |
|
} |
|
return 0; /* Finished */ |
|
|
|
default: |
|
printk(KERN_ERR "ppa: Invalid scsi phase\n"); |
|
} |
|
return 0; |
|
} |
|
|
|
static int ppa_queuecommand_lck(struct scsi_cmnd *cmd, |
|
void (*done) (struct scsi_cmnd *)) |
|
{ |
|
ppa_struct *dev = ppa_dev(cmd->device->host); |
|
|
|
if (dev->cur_cmd) { |
|
printk(KERN_ERR "PPA: bug in ppa_queuecommand\n"); |
|
return 0; |
|
} |
|
dev->failed = 0; |
|
dev->jstart = jiffies; |
|
dev->cur_cmd = cmd; |
|
cmd->scsi_done = done; |
|
cmd->result = DID_ERROR << 16; /* default return code */ |
|
cmd->SCp.phase = 0; /* bus free */ |
|
|
|
schedule_delayed_work(&dev->ppa_tq, 0); |
|
|
|
ppa_pb_claim(dev); |
|
|
|
return 0; |
|
} |
|
|
|
static DEF_SCSI_QCMD(ppa_queuecommand) |
|
|
|
/* |
|
* Apparently the disk->capacity attribute is off by 1 sector |
|
* for all disk drives. We add the one here, but it should really |
|
* be done in sd.c. Even if it gets fixed there, this will still |
|
* work. |
|
*/ |
|
static int ppa_biosparam(struct scsi_device *sdev, struct block_device *dev, |
|
sector_t capacity, int ip[]) |
|
{ |
|
ip[0] = 0x40; |
|
ip[1] = 0x20; |
|
ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); |
|
if (ip[2] > 1024) { |
|
ip[0] = 0xff; |
|
ip[1] = 0x3f; |
|
ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); |
|
if (ip[2] > 1023) |
|
ip[2] = 1023; |
|
} |
|
return 0; |
|
} |
|
|
|
static int ppa_abort(struct scsi_cmnd *cmd) |
|
{ |
|
ppa_struct *dev = ppa_dev(cmd->device->host); |
|
/* |
|
* There is no method for aborting commands since Iomega |
|
* have tied the SCSI_MESSAGE line high in the interface |
|
*/ |
|
|
|
switch (cmd->SCp.phase) { |
|
case 0: /* Do not have access to parport */ |
|
case 1: /* Have not connected to interface */ |
|
dev->cur_cmd = NULL; /* Forget the problem */ |
|
return SUCCESS; |
|
default: /* SCSI command sent, can not abort */ |
|
return FAILED; |
|
} |
|
} |
|
|
|
static void ppa_reset_pulse(unsigned int base) |
|
{ |
|
w_dtr(base, 0x40); |
|
w_ctr(base, 0x8); |
|
udelay(30); |
|
w_ctr(base, 0xc); |
|
} |
|
|
|
static int ppa_reset(struct scsi_cmnd *cmd) |
|
{ |
|
ppa_struct *dev = ppa_dev(cmd->device->host); |
|
|
|
if (cmd->SCp.phase) |
|
ppa_disconnect(dev); |
|
dev->cur_cmd = NULL; /* Forget the problem */ |
|
|
|
ppa_connect(dev, CONNECT_NORMAL); |
|
ppa_reset_pulse(dev->base); |
|
mdelay(1); /* device settle delay */ |
|
ppa_disconnect(dev); |
|
mdelay(1); /* device settle delay */ |
|
return SUCCESS; |
|
} |
|
|
|
static int device_check(ppa_struct *dev) |
|
{ |
|
/* This routine looks for a device and then attempts to use EPP |
|
to send a command. If all goes as planned then EPP is available. */ |
|
|
|
static u8 cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
|
int loop, old_mode, status, k, ppb = dev->base; |
|
unsigned char l; |
|
|
|
old_mode = dev->mode; |
|
for (loop = 0; loop < 8; loop++) { |
|
/* Attempt to use EPP for Test Unit Ready */ |
|
if ((ppb & 0x0007) == 0x0000) |
|
dev->mode = PPA_EPP_32; |
|
|
|
second_pass: |
|
ppa_connect(dev, CONNECT_EPP_MAYBE); |
|
/* Select SCSI device */ |
|
if (!ppa_select(dev, loop)) { |
|
ppa_disconnect(dev); |
|
continue; |
|
} |
|
printk(KERN_INFO "ppa: Found device at ID %i, Attempting to use %s\n", |
|
loop, PPA_MODE_STRING[dev->mode]); |
|
|
|
/* Send SCSI command */ |
|
status = 1; |
|
w_ctr(ppb, 0x0c); |
|
for (l = 0; (l < 6) && (status); l++) |
|
status = ppa_out(dev, cmd, 1); |
|
|
|
if (!status) { |
|
ppa_disconnect(dev); |
|
ppa_connect(dev, CONNECT_EPP_MAYBE); |
|
w_dtr(ppb, 0x40); |
|
w_ctr(ppb, 0x08); |
|
udelay(30); |
|
w_ctr(ppb, 0x0c); |
|
udelay(1000); |
|
ppa_disconnect(dev); |
|
udelay(1000); |
|
if (dev->mode == PPA_EPP_32) { |
|
dev->mode = old_mode; |
|
goto second_pass; |
|
} |
|
return -EIO; |
|
} |
|
w_ctr(ppb, 0x0c); |
|
k = 1000000; /* 1 Second */ |
|
do { |
|
l = r_str(ppb); |
|
k--; |
|
udelay(1); |
|
} while (!(l & 0x80) && (k)); |
|
|
|
l &= 0xf0; |
|
|
|
if (l != 0xf0) { |
|
ppa_disconnect(dev); |
|
ppa_connect(dev, CONNECT_EPP_MAYBE); |
|
ppa_reset_pulse(ppb); |
|
udelay(1000); |
|
ppa_disconnect(dev); |
|
udelay(1000); |
|
if (dev->mode == PPA_EPP_32) { |
|
dev->mode = old_mode; |
|
goto second_pass; |
|
} |
|
return -EIO; |
|
} |
|
ppa_disconnect(dev); |
|
printk(KERN_INFO "ppa: Communication established with ID %i using %s\n", |
|
loop, PPA_MODE_STRING[dev->mode]); |
|
ppa_connect(dev, CONNECT_EPP_MAYBE); |
|
ppa_reset_pulse(ppb); |
|
udelay(1000); |
|
ppa_disconnect(dev); |
|
udelay(1000); |
|
return 0; |
|
} |
|
return -ENODEV; |
|
} |
|
|
|
static int ppa_adjust_queue(struct scsi_device *device) |
|
{ |
|
blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); |
|
return 0; |
|
} |
|
|
|
static struct scsi_host_template ppa_template = { |
|
.module = THIS_MODULE, |
|
.proc_name = "ppa", |
|
.show_info = ppa_show_info, |
|
.write_info = ppa_write_info, |
|
.name = "Iomega VPI0 (ppa) interface", |
|
.queuecommand = ppa_queuecommand, |
|
.eh_abort_handler = ppa_abort, |
|
.eh_host_reset_handler = ppa_reset, |
|
.bios_param = ppa_biosparam, |
|
.this_id = -1, |
|
.sg_tablesize = SG_ALL, |
|
.can_queue = 1, |
|
.slave_alloc = ppa_adjust_queue, |
|
}; |
|
|
|
/*************************************************************************** |
|
* Parallel port probing routines * |
|
***************************************************************************/ |
|
|
|
static LIST_HEAD(ppa_hosts); |
|
|
|
/* |
|
* Finds the first available device number that can be alloted to the |
|
* new ppa device and returns the address of the previous node so that |
|
* we can add to the tail and have a list in the ascending order. |
|
*/ |
|
|
|
static inline ppa_struct *find_parent(void) |
|
{ |
|
ppa_struct *dev, *par = NULL; |
|
unsigned int cnt = 0; |
|
|
|
if (list_empty(&ppa_hosts)) |
|
return NULL; |
|
|
|
list_for_each_entry(dev, &ppa_hosts, list) { |
|
if (dev->dev_no != cnt) |
|
return par; |
|
cnt++; |
|
par = dev; |
|
} |
|
|
|
return par; |
|
} |
|
|
|
static int __ppa_attach(struct parport *pb) |
|
{ |
|
struct Scsi_Host *host; |
|
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); |
|
DEFINE_WAIT(wait); |
|
ppa_struct *dev, *temp; |
|
int ports; |
|
int modes, ppb, ppb_hi; |
|
int err = -ENOMEM; |
|
struct pardev_cb ppa_cb; |
|
|
|
dev = kzalloc(sizeof(ppa_struct), GFP_KERNEL); |
|
if (!dev) |
|
return -ENOMEM; |
|
dev->base = -1; |
|
dev->mode = PPA_AUTODETECT; |
|
dev->recon_tmo = PPA_RECON_TMO; |
|
init_waitqueue_head(&waiting); |
|
temp = find_parent(); |
|
if (temp) |
|
dev->dev_no = temp->dev_no + 1; |
|
|
|
memset(&ppa_cb, 0, sizeof(ppa_cb)); |
|
ppa_cb.private = dev; |
|
ppa_cb.wakeup = ppa_wakeup; |
|
|
|
dev->dev = parport_register_dev_model(pb, "ppa", &ppa_cb, dev->dev_no); |
|
|
|
if (!dev->dev) |
|
goto out; |
|
|
|
/* Claim the bus so it remembers what we do to the control |
|
* registers. [ CTR and ECP ] |
|
*/ |
|
err = -EBUSY; |
|
dev->waiting = &waiting; |
|
prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE); |
|
if (ppa_pb_claim(dev)) |
|
schedule_timeout(3 * HZ); |
|
if (dev->wanted) { |
|
printk(KERN_ERR "ppa%d: failed to claim parport because " |
|
"a pardevice is owning the port for too long " |
|
"time!\n", pb->number); |
|
ppa_pb_dismiss(dev); |
|
dev->waiting = NULL; |
|
finish_wait(&waiting, &wait); |
|
goto out1; |
|
} |
|
dev->waiting = NULL; |
|
finish_wait(&waiting, &wait); |
|
ppb = dev->base = dev->dev->port->base; |
|
ppb_hi = dev->dev->port->base_hi; |
|
w_ctr(ppb, 0x0c); |
|
modes = dev->dev->port->modes; |
|
|
|
/* Mode detection works up the chain of speed |
|
* This avoids a nasty if-then-else-if-... tree |
|
*/ |
|
dev->mode = PPA_NIBBLE; |
|
|
|
if (modes & PARPORT_MODE_TRISTATE) |
|
dev->mode = PPA_PS2; |
|
|
|
if (modes & PARPORT_MODE_ECP) { |
|
w_ecr(ppb_hi, 0x20); |
|
dev->mode = PPA_PS2; |
|
} |
|
if ((modes & PARPORT_MODE_EPP) && (modes & PARPORT_MODE_ECP)) |
|
w_ecr(ppb_hi, 0x80); |
|
|
|
/* Done configuration */ |
|
|
|
err = ppa_init(dev); |
|
ppa_pb_release(dev); |
|
|
|
if (err) |
|
goto out1; |
|
|
|
/* now the glue ... */ |
|
if (dev->mode == PPA_NIBBLE || dev->mode == PPA_PS2) |
|
ports = 3; |
|
else |
|
ports = 8; |
|
|
|
INIT_DELAYED_WORK(&dev->ppa_tq, ppa_interrupt); |
|
|
|
err = -ENOMEM; |
|
host = scsi_host_alloc(&ppa_template, sizeof(ppa_struct *)); |
|
if (!host) |
|
goto out1; |
|
host->io_port = pb->base; |
|
host->n_io_port = ports; |
|
host->dma_channel = -1; |
|
host->unique_id = pb->number; |
|
*(ppa_struct **)&host->hostdata = dev; |
|
dev->host = host; |
|
list_add_tail(&dev->list, &ppa_hosts); |
|
err = scsi_add_host(host, NULL); |
|
if (err) |
|
goto out2; |
|
scsi_scan_host(host); |
|
return 0; |
|
out2: |
|
list_del_init(&dev->list); |
|
scsi_host_put(host); |
|
out1: |
|
parport_unregister_device(dev->dev); |
|
out: |
|
kfree(dev); |
|
return err; |
|
} |
|
|
|
static void ppa_attach(struct parport *pb) |
|
{ |
|
__ppa_attach(pb); |
|
} |
|
|
|
static void ppa_detach(struct parport *pb) |
|
{ |
|
ppa_struct *dev; |
|
list_for_each_entry(dev, &ppa_hosts, list) { |
|
if (dev->dev->port == pb) { |
|
list_del_init(&dev->list); |
|
scsi_remove_host(dev->host); |
|
scsi_host_put(dev->host); |
|
parport_unregister_device(dev->dev); |
|
kfree(dev); |
|
break; |
|
} |
|
} |
|
} |
|
|
|
static struct parport_driver ppa_driver = { |
|
.name = "ppa", |
|
.match_port = ppa_attach, |
|
.detach = ppa_detach, |
|
.devmodel = true, |
|
}; |
|
|
|
static int __init ppa_driver_init(void) |
|
{ |
|
printk(KERN_INFO "ppa: Version %s\n", PPA_VERSION); |
|
return parport_register_driver(&ppa_driver); |
|
} |
|
|
|
static void __exit ppa_driver_exit(void) |
|
{ |
|
parport_unregister_driver(&ppa_driver); |
|
} |
|
|
|
module_init(ppa_driver_init); |
|
module_exit(ppa_driver_exit); |
|
MODULE_LICENSE("GPL");
|
|
|