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1301 lines
30 KiB
1301 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* imm.c -- low level driver for the IOMEGA MatchMaker |
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* parallel port SCSI host adapter. |
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* |
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* (The IMM is the embedded controller in the ZIP Plus drive.) |
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* |
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* My unofficial company acronym list is 21 pages long: |
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* FLA: Four letter acronym with built in facility for |
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* future expansion to five letters. |
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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/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/slab.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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/* The following #define is to avoid a clash with hosts.c */ |
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#define IMM_PROBE_SPP 0x0001 |
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#define IMM_PROBE_PS2 0x0002 |
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#define IMM_PROBE_ECR 0x0010 |
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#define IMM_PROBE_EPP17 0x0100 |
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#define IMM_PROBE_EPP19 0x0200 |
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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 base_hi; /* Hi Base address for ECP-ISA chipset */ |
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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 imm_tq; /* Polling interrupt stuff */ |
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unsigned long jstart; /* Jiffies at start */ |
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unsigned failed:1; /* Failure flag */ |
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unsigned dp:1; /* Data phase present */ |
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unsigned rd:1; /* Read data in data phase */ |
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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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} imm_struct; |
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static void imm_reset_pulse(unsigned int base); |
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static int device_check(imm_struct *dev); |
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#include "imm.h" |
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static inline imm_struct *imm_dev(struct Scsi_Host *host) |
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{ |
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return *(imm_struct **)&host->hostdata; |
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} |
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static DEFINE_SPINLOCK(arbitration_lock); |
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static void got_it(imm_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 imm_wakeup(void *ref) |
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{ |
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imm_struct *dev = (imm_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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if (parport_claim(dev->dev) == 0) { |
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got_it(dev); |
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dev->wanted = 0; |
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} |
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} |
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spin_unlock_irqrestore(&arbitration_lock, flags); |
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} |
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static int imm_pb_claim(imm_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 imm_pb_dismiss(imm_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 imm_pb_release(imm_struct *dev) |
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{ |
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parport_release(dev->dev); |
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} |
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/* This is to give the imm driver a way to modify the timings (and other |
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* parameters) by writing to the /proc/scsi/imm/0 file. |
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* Very simple method really... (Too 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 int imm_write_info(struct Scsi_Host *host, char *buffer, int length) |
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{ |
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imm_struct *dev = imm_dev(host); |
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if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) { |
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dev->mode = simple_strtoul(buffer + 5, NULL, 0); |
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return length; |
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} |
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printk("imm /proc: invalid variable\n"); |
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return -EINVAL; |
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} |
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static int imm_show_info(struct seq_file *m, struct Scsi_Host *host) |
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{ |
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imm_struct *dev = imm_dev(host); |
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seq_printf(m, "Version : %s\n", IMM_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", IMM_MODE_STRING[dev->mode]); |
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return 0; |
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} |
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#if IMM_DEBUG > 0 |
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#define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\ |
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y, __func__, __LINE__); imm_fail_func(x,y); |
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static inline void |
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imm_fail_func(imm_struct *dev, int error_code) |
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#else |
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static inline void |
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imm_fail(imm_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 imm_wait(imm_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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w_ctr(ppb, 0x0c); |
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k = IMM_SPIN_TMO; |
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do { |
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r = r_str(ppb); |
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k--; |
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udelay(1); |
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} |
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while (!(r & 0x80) && (k)); |
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/* |
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* STR register (LPT base+1) to SCSI mapping: |
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* |
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* STR imm imm |
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* =================================== |
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* 0x80 S_REQ S_REQ |
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* 0x40 !S_BSY (????) |
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* 0x20 !S_CD !S_CD |
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* 0x10 !S_IO !S_IO |
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* 0x08 (????) !S_BSY |
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* |
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* imm imm meaning |
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* ================================== |
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* 0xf0 0xb8 Bit mask |
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* 0xc0 0x88 ZIP wants more data |
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* 0xd0 0x98 ZIP wants to send more data |
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* 0xe0 0xa8 ZIP is expecting SCSI command data |
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* 0xf0 0xb8 end of transfer, ZIP is sending status |
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*/ |
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w_ctr(ppb, 0x04); |
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if (k) |
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return (r & 0xb8); |
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/* Counter expired - Time out occurred */ |
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imm_fail(dev, DID_TIME_OUT); |
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printk("imm timeout in imm_wait\n"); |
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return 0; /* command timed out */ |
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} |
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static int imm_negotiate(imm_struct * tmp) |
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{ |
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/* |
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* The following is supposedly the IEEE 1284-1994 negotiate |
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* sequence. I have yet to obtain a copy of the above standard |
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* so this is a bit of a guess... |
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* |
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* A fair chunk of this is based on the Linux parport implementation |
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* of IEEE 1284. |
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* |
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* Return 0 if data available |
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* 1 if no data available |
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*/ |
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unsigned short base = tmp->base; |
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unsigned char a, mode; |
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switch (tmp->mode) { |
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case IMM_NIBBLE: |
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mode = 0x00; |
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break; |
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case IMM_PS2: |
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mode = 0x01; |
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break; |
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default: |
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return 0; |
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} |
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w_ctr(base, 0x04); |
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udelay(5); |
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w_dtr(base, mode); |
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udelay(100); |
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w_ctr(base, 0x06); |
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udelay(5); |
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a = (r_str(base) & 0x20) ? 0 : 1; |
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udelay(5); |
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w_ctr(base, 0x07); |
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udelay(5); |
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w_ctr(base, 0x06); |
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if (a) { |
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printk |
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("IMM: IEEE1284 negotiate indicates no data available.\n"); |
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imm_fail(tmp, DID_ERROR); |
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} |
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return a; |
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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(imm_struct *dev) |
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{ |
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int i, ppb_hi = dev->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("imm: ECP sync failed as data still present in FIFO.\n"); |
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} |
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} |
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static int imm_byte_out(unsigned short base, const char *buffer, int len) |
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{ |
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int i; |
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w_ctr(base, 0x4); /* apparently a sane mode */ |
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for (i = len >> 1; i; i--) { |
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w_dtr(base, *buffer++); |
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w_ctr(base, 0x5); /* Drop STROBE low */ |
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w_dtr(base, *buffer++); |
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w_ctr(base, 0x0); /* STROBE high + INIT low */ |
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} |
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w_ctr(base, 0x4); /* apparently a sane mode */ |
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return 1; /* All went well - we hope! */ |
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} |
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static int imm_nibble_in(unsigned short base, char *buffer, int len) |
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{ |
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unsigned char l; |
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int i; |
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/* |
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* The following is based on documented timing signals |
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*/ |
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w_ctr(base, 0x4); |
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for (i = len; i; i--) { |
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w_ctr(base, 0x6); |
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l = (r_str(base) & 0xf0) >> 4; |
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w_ctr(base, 0x5); |
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*buffer++ = (r_str(base) & 0xf0) | l; |
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w_ctr(base, 0x4); |
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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 imm_byte_in(unsigned short base, char *buffer, int len) |
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{ |
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int i; |
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/* |
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* The following is based on documented timing signals |
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*/ |
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w_ctr(base, 0x4); |
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for (i = len; i; i--) { |
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w_ctr(base, 0x26); |
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*buffer++ = r_dtr(base); |
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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 imm_out(imm_struct *dev, char *buffer, int len) |
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{ |
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unsigned short ppb = dev->base; |
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int r = imm_wait(dev); |
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/* |
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* Make sure that: |
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* a) the SCSI bus is BUSY (device still listening) |
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* b) the device is listening |
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*/ |
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if ((r & 0x18) != 0x08) { |
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imm_fail(dev, DID_ERROR); |
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printk("IMM: returned SCSI status %2x\n", r); |
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return 0; |
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} |
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switch (dev->mode) { |
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case IMM_EPP_32: |
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case IMM_EPP_16: |
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case IMM_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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case IMM_NIBBLE: |
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case IMM_PS2: |
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/* 8 bit output, with a loop */ |
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r = imm_byte_out(ppb, buffer, len); |
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break; |
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default: |
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printk("IMM: bug in imm_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 imm_in(imm_struct *dev, char *buffer, int len) |
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{ |
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unsigned short ppb = dev->base; |
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int r = imm_wait(dev); |
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/* |
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* Make sure that: |
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* a) the SCSI bus is BUSY (device still listening) |
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* b) the device is sending data |
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*/ |
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if ((r & 0x18) != 0x18) { |
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imm_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 IMM_NIBBLE: |
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/* 4 bit input, with a loop */ |
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r = imm_nibble_in(ppb, buffer, len); |
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w_ctr(ppb, 0xc); |
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break; |
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case IMM_PS2: |
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/* 8 bit input, with a loop */ |
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r = imm_byte_in(ppb, buffer, len); |
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w_ctr(ppb, 0xc); |
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break; |
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case IMM_EPP_32: |
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case IMM_EPP_16: |
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case IMM_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("IMM: bug in imm_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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static int imm_cpp(unsigned short ppb, unsigned char b) |
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{ |
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/* |
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* Comments on udelay values refer to the |
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* Command Packet Protocol (CPP) timing diagram. |
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*/ |
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unsigned char s1, s2, s3; |
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w_ctr(ppb, 0x0c); |
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udelay(2); /* 1 usec - infinite */ |
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w_dtr(ppb, 0xaa); |
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udelay(10); /* 7 usec - infinite */ |
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w_dtr(ppb, 0x55); |
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udelay(10); /* 7 usec - infinite */ |
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w_dtr(ppb, 0x00); |
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udelay(10); /* 7 usec - infinite */ |
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w_dtr(ppb, 0xff); |
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udelay(10); /* 7 usec - infinite */ |
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s1 = r_str(ppb) & 0xb8; |
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w_dtr(ppb, 0x87); |
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udelay(10); /* 7 usec - infinite */ |
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s2 = r_str(ppb) & 0xb8; |
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w_dtr(ppb, 0x78); |
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udelay(10); /* 7 usec - infinite */ |
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s3 = r_str(ppb) & 0x38; |
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/* |
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* Values for b are: |
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* 0000 00aa Assign address aa to current device |
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* 0010 00aa Select device aa in EPP Winbond mode |
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* 0010 10aa Select device aa in EPP mode |
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* 0011 xxxx Deselect all devices |
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* 0110 00aa Test device aa |
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* 1101 00aa Select device aa in ECP mode |
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* 1110 00aa Select device aa in Compatible mode |
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*/ |
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w_dtr(ppb, b); |
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udelay(2); /* 1 usec - infinite */ |
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w_ctr(ppb, 0x0c); |
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udelay(10); /* 7 usec - infinite */ |
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w_ctr(ppb, 0x0d); |
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udelay(2); /* 1 usec - infinite */ |
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w_ctr(ppb, 0x0c); |
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udelay(10); /* 7 usec - infinite */ |
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w_dtr(ppb, 0xff); |
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udelay(10); /* 7 usec - infinite */ |
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|
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/* |
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* The following table is electrical pin values. |
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* (BSY is inverted at the CTR register) |
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* |
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* BSY ACK POut SEL Fault |
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* S1 0 X 1 1 1 |
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* S2 1 X 0 1 1 |
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* S3 L X 1 1 S |
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* |
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* L => Last device in chain |
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* S => Selected |
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* |
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* Observered values for S1,S2,S3 are: |
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* Disconnect => f8/58/78 |
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* Connect => f8/58/70 |
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*/ |
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if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30)) |
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return 1; /* Connected */ |
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if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38)) |
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return 0; /* Disconnected */ |
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|
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return -1; /* No device present */ |
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} |
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static inline int imm_connect(imm_struct *dev, int flag) |
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{ |
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unsigned short ppb = dev->base; |
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imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */ |
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imm_cpp(ppb, 0x30); /* Disconnect all devices */ |
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if ((dev->mode == IMM_EPP_8) || |
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(dev->mode == IMM_EPP_16) || |
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(dev->mode == IMM_EPP_32)) |
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return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */ |
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return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */ |
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} |
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static void imm_disconnect(imm_struct *dev) |
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{ |
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imm_cpp(dev->base, 0x30); /* Disconnect all devices */ |
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} |
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static int imm_select(imm_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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* Firstly we want to make sure there is nothing |
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* holding onto the SCSI bus. |
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*/ |
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w_ctr(ppb, 0xc); |
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k = IMM_SELECT_TMO; |
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do { |
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k--; |
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} while ((r_str(ppb) & 0x08) && (k)); |
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if (!k) |
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return 0; |
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|
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/* |
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* Now assert the SCSI ID (HOST and TARGET) on the data bus |
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*/ |
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w_ctr(ppb, 0x4); |
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w_dtr(ppb, 0x80 | (1 << target)); |
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udelay(1); |
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/* |
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* Deassert SELIN first followed by STROBE |
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*/ |
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w_ctr(ppb, 0xc); |
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w_ctr(ppb, 0xd); |
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|
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/* |
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* ACK should drop low while SELIN is deasserted. |
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* FAULT should drop low when the SCSI device latches the bus. |
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*/ |
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k = IMM_SELECT_TMO; |
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do { |
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k--; |
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} |
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while (!(r_str(ppb) & 0x08) && (k)); |
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|
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/* |
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* Place the interface back into a sane state (status mode) |
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*/ |
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w_ctr(ppb, 0xc); |
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return (k) ? 1 : 0; |
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} |
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|
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static int imm_init(imm_struct *dev) |
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{ |
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if (imm_connect(dev, 0) != 1) |
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return -EIO; |
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imm_reset_pulse(dev->base); |
|
mdelay(1); /* Delay to allow devices to settle */ |
|
imm_disconnect(dev); |
|
mdelay(1); /* Another delay to allow devices to settle */ |
|
return device_check(dev); |
|
} |
|
|
|
static inline int imm_send_command(struct scsi_cmnd *cmd) |
|
{ |
|
imm_struct *dev = imm_dev(cmd->device->host); |
|
int k; |
|
|
|
/* NOTE: IMM uses byte pairs */ |
|
for (k = 0; k < cmd->cmd_len; k += 2) |
|
if (!imm_out(dev, &cmd->cmnd[k], 2)) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
/* |
|
* The bulk flag enables some optimisations in the data transfer loops, |
|
* it should be true for any command that transfers data in integral |
|
* numbers of sectors. |
|
* |
|
* The driver appears to remain stable if we speed up the parallel port |
|
* i/o in this function, but not elsewhere. |
|
*/ |
|
static int imm_completion(struct scsi_cmnd *cmd) |
|
{ |
|
/* Return codes: |
|
* -1 Error |
|
* 0 Told to schedule |
|
* 1 Finished data transfer |
|
*/ |
|
imm_struct *dev = imm_dev(cmd->device->host); |
|
unsigned short ppb = dev->base; |
|
unsigned long start_jiffies = jiffies; |
|
|
|
unsigned char r, v; |
|
int fast, bulk, status; |
|
|
|
v = cmd->cmnd[0]; |
|
bulk = ((v == READ_6) || |
|
(v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); |
|
|
|
/* |
|
* We only get here if the drive is ready to comunicate, |
|
* hence no need for a full imm_wait. |
|
*/ |
|
w_ctr(ppb, 0x0c); |
|
r = (r_str(ppb) & 0xb8); |
|
|
|
/* |
|
* while (device is not ready to send status byte) |
|
* loop; |
|
*/ |
|
while (r != (unsigned char) 0xb8) { |
|
/* |
|
* If we have been running for more than a full timer tick |
|
* then take a rest. |
|
*/ |
|
if (time_after(jiffies, start_jiffies + 1)) |
|
return 0; |
|
|
|
/* |
|
* FAIL if: |
|
* a) Drive status is screwy (!ready && !present) |
|
* b) Drive is requesting/sending more data than expected |
|
*/ |
|
if (((r & 0x88) != 0x88) || (cmd->SCp.this_residual <= 0)) { |
|
imm_fail(dev, DID_ERROR); |
|
return -1; /* ERROR_RETURN */ |
|
} |
|
/* determine if we should use burst I/O */ |
|
if (dev->rd == 0) { |
|
fast = (bulk |
|
&& (cmd->SCp.this_residual >= |
|
IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2; |
|
status = imm_out(dev, cmd->SCp.ptr, fast); |
|
} else { |
|
fast = (bulk |
|
&& (cmd->SCp.this_residual >= |
|
IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1; |
|
status = imm_in(dev, cmd->SCp.ptr, fast); |
|
} |
|
|
|
cmd->SCp.ptr += fast; |
|
cmd->SCp.this_residual -= fast; |
|
|
|
if (!status) { |
|
imm_fail(dev, DID_BUS_BUSY); |
|
return -1; /* ERROR_RETURN */ |
|
} |
|
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); |
|
|
|
/* |
|
* Make sure that we transfer even number of bytes |
|
* otherwise it makes imm_byte_out() messy. |
|
*/ |
|
if (cmd->SCp.this_residual & 0x01) |
|
cmd->SCp.this_residual++; |
|
} |
|
} |
|
/* Now check to see if the drive is ready to comunicate */ |
|
w_ctr(ppb, 0x0c); |
|
r = (r_str(ppb) & 0xb8); |
|
|
|
/* If not, drop back down to the scheduler and wait a timer tick */ |
|
if (!(r & 0x80)) |
|
return 0; |
|
} |
|
return 1; /* FINISH_RETURN */ |
|
} |
|
|
|
/* |
|
* Since the IMM 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 imm_interrupt(struct work_struct *work) |
|
{ |
|
imm_struct *dev = container_of(work, imm_struct, imm_tq.work); |
|
struct scsi_cmnd *cmd = dev->cur_cmd; |
|
struct Scsi_Host *host = cmd->device->host; |
|
unsigned long flags; |
|
|
|
if (imm_engine(dev, cmd)) { |
|
schedule_delayed_work(&dev->imm_tq, 1); |
|
return; |
|
} |
|
/* Command must of completed hence it is safe to let go... */ |
|
#if IMM_DEBUG > 0 |
|
switch ((cmd->result >> 16) & 0xff) { |
|
case DID_OK: |
|
break; |
|
case DID_NO_CONNECT: |
|
printk("imm: no device at SCSI ID %i\n", cmd->device->id); |
|
break; |
|
case DID_BUS_BUSY: |
|
printk("imm: BUS BUSY - EPP timeout detected\n"); |
|
break; |
|
case DID_TIME_OUT: |
|
printk("imm: unknown timeout\n"); |
|
break; |
|
case DID_ABORT: |
|
printk("imm: told to abort\n"); |
|
break; |
|
case DID_PARITY: |
|
printk("imm: parity error (???)\n"); |
|
break; |
|
case DID_ERROR: |
|
printk("imm: internal driver error\n"); |
|
break; |
|
case DID_RESET: |
|
printk("imm: told to reset device\n"); |
|
break; |
|
case DID_BAD_INTR: |
|
printk("imm: bad interrupt (???)\n"); |
|
break; |
|
default: |
|
printk("imm: bad return code (%02x)\n", |
|
(cmd->result >> 16) & 0xff); |
|
} |
|
#endif |
|
|
|
if (cmd->SCp.phase > 1) |
|
imm_disconnect(dev); |
|
|
|
imm_pb_dismiss(dev); |
|
|
|
spin_lock_irqsave(host->host_lock, flags); |
|
dev->cur_cmd = NULL; |
|
cmd->scsi_done(cmd); |
|
spin_unlock_irqrestore(host->host_lock, flags); |
|
return; |
|
} |
|
|
|
static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) |
|
{ |
|
unsigned short ppb = dev->base; |
|
unsigned char l = 0, h = 0; |
|
int retv, x; |
|
|
|
/* First check for any errors that may have 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 |
|
*/ |
|
imm_fail(dev, DID_BUS_BUSY); |
|
return 0; |
|
} |
|
return 1; /* wait until imm_wakeup claims parport */ |
|
|
|
case 1: /* Phase 1 - Connected */ |
|
imm_connect(dev, CONNECT_EPP_MAYBE); |
|
cmd->SCp.phase++; |
|
fallthrough; |
|
|
|
case 2: /* Phase 2 - We are now talking to the scsi bus */ |
|
if (!imm_select(dev, scmd_id(cmd))) { |
|
imm_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 (!imm_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++; |
|
if (cmd->SCp.this_residual & 0x01) |
|
cmd->SCp.this_residual++; |
|
fallthrough; |
|
|
|
case 5: /* Phase 5 - Pre-Data transfer stage */ |
|
/* Spin lock for BUSY */ |
|
w_ctr(ppb, 0x0c); |
|
if (!(r_str(ppb) & 0x80)) |
|
return 1; |
|
|
|
/* Require negotiation for read requests */ |
|
x = (r_str(ppb) & 0xb8); |
|
dev->rd = (x & 0x10) ? 1 : 0; |
|
dev->dp = (x & 0x20) ? 0 : 1; |
|
|
|
if ((dev->dp) && (dev->rd)) |
|
if (imm_negotiate(dev)) |
|
return 0; |
|
cmd->SCp.phase++; |
|
fallthrough; |
|
|
|
case 6: /* Phase 6 - Data transfer stage */ |
|
/* Spin lock for BUSY */ |
|
w_ctr(ppb, 0x0c); |
|
if (!(r_str(ppb) & 0x80)) |
|
return 1; |
|
|
|
if (dev->dp) { |
|
retv = imm_completion(cmd); |
|
if (retv == -1) |
|
return 0; |
|
if (retv == 0) |
|
return 1; |
|
} |
|
cmd->SCp.phase++; |
|
fallthrough; |
|
|
|
case 7: /* Phase 7 - Post data transfer stage */ |
|
if ((dev->dp) && (dev->rd)) { |
|
if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { |
|
w_ctr(ppb, 0x4); |
|
w_ctr(ppb, 0xc); |
|
w_ctr(ppb, 0xe); |
|
w_ctr(ppb, 0x4); |
|
} |
|
} |
|
cmd->SCp.phase++; |
|
fallthrough; |
|
|
|
case 8: /* Phase 8 - Read status/message */ |
|
/* Check for data overrun */ |
|
if (imm_wait(dev) != (unsigned char) 0xb8) { |
|
imm_fail(dev, DID_ERROR); |
|
return 0; |
|
} |
|
if (imm_negotiate(dev)) |
|
return 0; |
|
if (imm_in(dev, &l, 1)) { /* read status byte */ |
|
/* Check for optional message byte */ |
|
if (imm_wait(dev) == (unsigned char) 0xb8) |
|
imm_in(dev, &h, 1); |
|
cmd->result = (DID_OK << 16) | (l & STATUS_MASK); |
|
} |
|
if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { |
|
w_ctr(ppb, 0x4); |
|
w_ctr(ppb, 0xc); |
|
w_ctr(ppb, 0xe); |
|
w_ctr(ppb, 0x4); |
|
} |
|
return 0; /* Finished */ |
|
|
|
default: |
|
printk("imm: Invalid scsi phase\n"); |
|
} |
|
return 0; |
|
} |
|
|
|
static int imm_queuecommand_lck(struct scsi_cmnd *cmd, |
|
void (*done)(struct scsi_cmnd *)) |
|
{ |
|
imm_struct *dev = imm_dev(cmd->device->host); |
|
|
|
if (dev->cur_cmd) { |
|
printk("IMM: bug in imm_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->imm_tq, 0); |
|
|
|
imm_pb_claim(dev); |
|
|
|
return 0; |
|
} |
|
|
|
static DEF_SCSI_QCMD(imm_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 imm_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]); |
|
} |
|
return 0; |
|
} |
|
|
|
static int imm_abort(struct scsi_cmnd *cmd) |
|
{ |
|
imm_struct *dev = imm_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 imm_reset_pulse(unsigned int base) |
|
{ |
|
w_ctr(base, 0x04); |
|
w_dtr(base, 0x40); |
|
udelay(1); |
|
w_ctr(base, 0x0c); |
|
w_ctr(base, 0x0d); |
|
udelay(50); |
|
w_ctr(base, 0x0c); |
|
w_ctr(base, 0x04); |
|
} |
|
|
|
static int imm_reset(struct scsi_cmnd *cmd) |
|
{ |
|
imm_struct *dev = imm_dev(cmd->device->host); |
|
|
|
if (cmd->SCp.phase) |
|
imm_disconnect(dev); |
|
dev->cur_cmd = NULL; /* Forget the problem */ |
|
|
|
imm_connect(dev, CONNECT_NORMAL); |
|
imm_reset_pulse(dev->base); |
|
mdelay(1); /* device settle delay */ |
|
imm_disconnect(dev); |
|
mdelay(1); /* device settle delay */ |
|
return SUCCESS; |
|
} |
|
|
|
static int device_check(imm_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 char 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 = IMM_EPP_32; |
|
|
|
second_pass: |
|
imm_connect(dev, CONNECT_EPP_MAYBE); |
|
/* Select SCSI device */ |
|
if (!imm_select(dev, loop)) { |
|
imm_disconnect(dev); |
|
continue; |
|
} |
|
printk("imm: Found device at ID %i, Attempting to use %s\n", |
|
loop, IMM_MODE_STRING[dev->mode]); |
|
|
|
/* Send SCSI command */ |
|
status = 1; |
|
w_ctr(ppb, 0x0c); |
|
for (l = 0; (l < 3) && (status); l++) |
|
status = imm_out(dev, &cmd[l << 1], 2); |
|
|
|
if (!status) { |
|
imm_disconnect(dev); |
|
imm_connect(dev, CONNECT_EPP_MAYBE); |
|
imm_reset_pulse(dev->base); |
|
udelay(1000); |
|
imm_disconnect(dev); |
|
udelay(1000); |
|
if (dev->mode == IMM_EPP_32) { |
|
dev->mode = old_mode; |
|
goto second_pass; |
|
} |
|
printk("imm: Unable to establish communication\n"); |
|
return -EIO; |
|
} |
|
w_ctr(ppb, 0x0c); |
|
|
|
k = 1000000; /* 1 Second */ |
|
do { |
|
l = r_str(ppb); |
|
k--; |
|
udelay(1); |
|
} while (!(l & 0x80) && (k)); |
|
|
|
l &= 0xb8; |
|
|
|
if (l != 0xb8) { |
|
imm_disconnect(dev); |
|
imm_connect(dev, CONNECT_EPP_MAYBE); |
|
imm_reset_pulse(dev->base); |
|
udelay(1000); |
|
imm_disconnect(dev); |
|
udelay(1000); |
|
if (dev->mode == IMM_EPP_32) { |
|
dev->mode = old_mode; |
|
goto second_pass; |
|
} |
|
printk |
|
("imm: Unable to establish communication\n"); |
|
return -EIO; |
|
} |
|
imm_disconnect(dev); |
|
printk |
|
("imm: Communication established at 0x%x with ID %i using %s\n", |
|
ppb, loop, IMM_MODE_STRING[dev->mode]); |
|
imm_connect(dev, CONNECT_EPP_MAYBE); |
|
imm_reset_pulse(dev->base); |
|
udelay(1000); |
|
imm_disconnect(dev); |
|
udelay(1000); |
|
return 0; |
|
} |
|
printk("imm: No devices found\n"); |
|
return -ENODEV; |
|
} |
|
|
|
/* |
|
* imm cannot deal with highmem, so this causes all IO pages for this host |
|
* to reside in low memory (hence mapped) |
|
*/ |
|
static int imm_adjust_queue(struct scsi_device *device) |
|
{ |
|
blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); |
|
return 0; |
|
} |
|
|
|
static struct scsi_host_template imm_template = { |
|
.module = THIS_MODULE, |
|
.proc_name = "imm", |
|
.show_info = imm_show_info, |
|
.write_info = imm_write_info, |
|
.name = "Iomega VPI2 (imm) interface", |
|
.queuecommand = imm_queuecommand, |
|
.eh_abort_handler = imm_abort, |
|
.eh_host_reset_handler = imm_reset, |
|
.bios_param = imm_biosparam, |
|
.this_id = 7, |
|
.sg_tablesize = SG_ALL, |
|
.can_queue = 1, |
|
.slave_alloc = imm_adjust_queue, |
|
}; |
|
|
|
/*************************************************************************** |
|
* Parallel port probing routines * |
|
***************************************************************************/ |
|
|
|
static LIST_HEAD(imm_hosts); |
|
|
|
/* |
|
* Finds the first available device number that can be alloted to the |
|
* new imm 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 imm_struct *find_parent(void) |
|
{ |
|
imm_struct *dev, *par = NULL; |
|
unsigned int cnt = 0; |
|
|
|
if (list_empty(&imm_hosts)) |
|
return NULL; |
|
|
|
list_for_each_entry(dev, &imm_hosts, list) { |
|
if (dev->dev_no != cnt) |
|
return par; |
|
cnt++; |
|
par = dev; |
|
} |
|
|
|
return par; |
|
} |
|
|
|
static int __imm_attach(struct parport *pb) |
|
{ |
|
struct Scsi_Host *host; |
|
imm_struct *dev, *temp; |
|
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); |
|
DEFINE_WAIT(wait); |
|
int ports; |
|
int modes, ppb; |
|
int err = -ENOMEM; |
|
struct pardev_cb imm_cb; |
|
|
|
init_waitqueue_head(&waiting); |
|
|
|
dev = kzalloc(sizeof(imm_struct), GFP_KERNEL); |
|
if (!dev) |
|
return -ENOMEM; |
|
|
|
|
|
dev->base = -1; |
|
dev->mode = IMM_AUTODETECT; |
|
INIT_LIST_HEAD(&dev->list); |
|
|
|
temp = find_parent(); |
|
if (temp) |
|
dev->dev_no = temp->dev_no + 1; |
|
|
|
memset(&imm_cb, 0, sizeof(imm_cb)); |
|
imm_cb.private = dev; |
|
imm_cb.wakeup = imm_wakeup; |
|
|
|
dev->dev = parport_register_dev_model(pb, "imm", &imm_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 (imm_pb_claim(dev)) |
|
schedule_timeout(3 * HZ); |
|
if (dev->wanted) { |
|
printk(KERN_ERR "imm%d: failed to claim parport because " |
|
"a pardevice is owning the port for too long " |
|
"time!\n", pb->number); |
|
imm_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; |
|
dev->base_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 = IMM_NIBBLE; |
|
|
|
if (modes & PARPORT_MODE_TRISTATE) |
|
dev->mode = IMM_PS2; |
|
|
|
/* Done configuration */ |
|
|
|
err = imm_init(dev); |
|
|
|
imm_pb_release(dev); |
|
|
|
if (err) |
|
goto out1; |
|
|
|
/* now the glue ... */ |
|
if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2) |
|
ports = 3; |
|
else |
|
ports = 8; |
|
|
|
INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt); |
|
|
|
err = -ENOMEM; |
|
host = scsi_host_alloc(&imm_template, sizeof(imm_struct *)); |
|
if (!host) |
|
goto out1; |
|
host->io_port = pb->base; |
|
host->n_io_port = ports; |
|
host->dma_channel = -1; |
|
host->unique_id = pb->number; |
|
*(imm_struct **)&host->hostdata = dev; |
|
dev->host = host; |
|
if (!temp) |
|
list_add_tail(&dev->list, &imm_hosts); |
|
else |
|
list_add_tail(&dev->list, &temp->list); |
|
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 imm_attach(struct parport *pb) |
|
{ |
|
__imm_attach(pb); |
|
} |
|
|
|
static void imm_detach(struct parport *pb) |
|
{ |
|
imm_struct *dev; |
|
list_for_each_entry(dev, &imm_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 imm_driver = { |
|
.name = "imm", |
|
.match_port = imm_attach, |
|
.detach = imm_detach, |
|
.devmodel = true, |
|
}; |
|
|
|
static int __init imm_driver_init(void) |
|
{ |
|
printk("imm: Version %s\n", IMM_VERSION); |
|
return parport_register_driver(&imm_driver); |
|
} |
|
|
|
static void __exit imm_driver_exit(void) |
|
{ |
|
parport_unregister_driver(&imm_driver); |
|
} |
|
|
|
module_init(imm_driver_init); |
|
module_exit(imm_driver_exit); |
|
|
|
MODULE_LICENSE("GPL");
|
|
|