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linux/drivers/scsi/wd33c93.c
Jeff Garzik f281233d3e SCSI host lock push-down 
Move the mid-layer's ->queuecommand() invocation from being locked
with the host lock to being unlocked to facilitate speeding up the
critical path for drivers who don't need this lock taken anyway.

The patch below presents a simple SCSI host lock push-down as an
equivalent transformation.  No locking or other behavior should change
with this patch.  All existing bugs and locking orders are preserved.

Additionally, add one parameter to queuecommand,
	struct Scsi_Host *
and remove one parameter from queuecommand,
	void (*done)(struct scsi_cmnd *)

Scsi_Host* is a convenient pointer that most host drivers need anyway,
and 'done' is redundant to struct scsi_cmnd->scsi_done.

Minimal code disturbance was attempted with this change.  Most drivers
needed only two one-line modifications for their host lock push-down.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-16 13:33:23 -08:00

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/*
* Copyright (c) 1996 John Shifflett, GeoLog Consulting
* john@geolog.com
* jshiffle@netcom.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC
* provided much of the inspiration and some of the code for this
* driver. Everything I know about Amiga DMA was gleaned from careful
* reading of Hamish Mcdonald's original wd33c93 driver; in fact, I
* borrowed shamelessly from all over that source. Thanks Hamish!
*
* _This_ driver is (I feel) an improvement over the old one in
* several respects:
*
* - Target Disconnection/Reconnection is now supported. Any
* system with more than one device active on the SCSI bus
* will benefit from this. The driver defaults to what I
* call 'adaptive disconnect' - meaning that each command
* is evaluated individually as to whether or not it should
* be run with the option to disconnect/reselect (if the
* device chooses), or as a "SCSI-bus-hog".
*
* - Synchronous data transfers are now supported. Because of
* a few devices that choke after telling the driver that
* they can do sync transfers, we don't automatically use
* this faster protocol - it can be enabled via the command-
* line on a device-by-device basis.
*
* - Runtime operating parameters can now be specified through
* the 'amiboot' or the 'insmod' command line. For amiboot do:
* "amiboot [usual stuff] wd33c93=blah,blah,blah"
* The defaults should be good for most people. See the comment
* for 'setup_strings' below for more details.
*
* - The old driver relied exclusively on what the Western Digital
* docs call "Combination Level 2 Commands", which are a great
* idea in that the CPU is relieved of a lot of interrupt
* overhead. However, by accepting a certain (user-settable)
* amount of additional interrupts, this driver achieves
* better control over the SCSI bus, and data transfers are
* almost as fast while being much easier to define, track,
* and debug.
*
*
* TODO:
* more speed. linked commands.
*
*
* People with bug reports, wish-lists, complaints, comments,
* or improvements are asked to pah-leeez email me (John Shifflett)
* at john@geolog.com or jshiffle@netcom.com! I'm anxious to get
* this thing into as good a shape as possible, and I'm positive
* there are lots of lurking bugs and "Stupid Places".
*
* Updates:
*
* Added support for pre -A chips, which don't have advanced features
* and will generate CSR_RESEL rather than CSR_RESEL_AM.
* Richard Hirst <richard@sleepie.demon.co.uk> August 2000
*
* Added support for Burst Mode DMA and Fast SCSI. Enabled the use of
* default_sx_per for asynchronous data transfers. Added adjustment
* of transfer periods in sx_table to the actual input-clock.
* peter fuerst <post@pfrst.de> February 2007
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <asm/irq.h>
#include "wd33c93.h"
#define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns
#define WD33C93_VERSION "1.26++"
#define WD33C93_DATE "10/Feb/2007"
MODULE_AUTHOR("John Shifflett");
MODULE_DESCRIPTION("Generic WD33C93 SCSI driver");
MODULE_LICENSE("GPL");
/*
* 'setup_strings' is a single string used to pass operating parameters and
* settings from the kernel/module command-line to the driver. 'setup_args[]'
* is an array of strings that define the compile-time default values for
* these settings. If Linux boots with an amiboot or insmod command-line,
* those settings are combined with 'setup_args[]'. Note that amiboot
* command-lines are prefixed with "wd33c93=" while insmod uses a
* "setup_strings=" prefix. The driver recognizes the following keywords
* (lower case required) and arguments:
*
* - nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with
* the 7 possible SCSI devices. Set a bit to negotiate for
* asynchronous transfers on that device. To maintain
* backwards compatibility, a command-line such as
* "wd33c93=255" will be automatically translated to
* "wd33c93=nosync:0xff".
* - nodma:x -x = 1 to disable DMA, x = 0 to enable it. Argument is
* optional - if not present, same as "nodma:1".
* - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer
* period. Default is 500; acceptable values are 250 - 1000.
* - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them.
* x = 1 does 'adaptive' disconnects, which is the default
* and generally the best choice.
* - debug:x -If 'DEBUGGING_ON' is defined, x is a bit mask that causes
* various types of debug output to printed - see the DB_xxx
* defines in wd33c93.h
* - clock:x -x = clock input in MHz for WD33c93 chip. Normal values
* would be from 8 through 20. Default is 8.
* - burst:x -x = 1 to use Burst Mode (or Demand-Mode) DMA, x = 0 to use
* Single Byte DMA, which is the default. Argument is
* optional - if not present, same as "burst:1".
* - fast:x -x = 1 to enable Fast SCSI, which is only effective with
* input-clock divisor 4 (WD33C93_FS_16_20), x = 0 to disable
* it, which is the default. Argument is optional - if not
* present, same as "fast:1".
* - next -No argument. Used to separate blocks of keywords when
* there's more than one host adapter in the system.
*
* Syntax Notes:
* - Numeric arguments can be decimal or the '0x' form of hex notation. There
* _must_ be a colon between a keyword and its numeric argument, with no
* spaces.
* - Keywords are separated by commas, no spaces, in the standard kernel
* command-line manner.
* - A keyword in the 'nth' comma-separated command-line member will overwrite
* the 'nth' element of setup_args[]. A blank command-line member (in
* other words, a comma with no preceding keyword) will _not_ overwrite
* the corresponding setup_args[] element.
* - If a keyword is used more than once, the first one applies to the first
* SCSI host found, the second to the second card, etc, unless the 'next'
* keyword is used to change the order.
*
* Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'):
* - wd33c93=nosync:255
* - wd33c93=nodma
* - wd33c93=nodma:1
* - wd33c93=disconnect:2,nosync:0x08,period:250
* - wd33c93=debug:0x1c
*/
/* Normally, no defaults are specified */
static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" };
static char *setup_strings;
module_param(setup_strings, charp, 0);
static void wd33c93_execute(struct Scsi_Host *instance);
#ifdef CONFIG_WD33C93_PIO
static inline uchar
read_wd33c93(const wd33c93_regs regs, uchar reg_num)
{
uchar data;
outb(reg_num, regs.SASR);
data = inb(regs.SCMD);
return data;
}
static inline unsigned long
read_wd33c93_count(const wd33c93_regs regs)
{
unsigned long value;
outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
value = inb(regs.SCMD) << 16;
value |= inb(regs.SCMD) << 8;
value |= inb(regs.SCMD);
return value;
}
static inline uchar
read_aux_stat(const wd33c93_regs regs)
{
return inb(regs.SASR);
}
static inline void
write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
{
outb(reg_num, regs.SASR);
outb(value, regs.SCMD);
}
static inline void
write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
{
outb(WD_TRANSFER_COUNT_MSB, regs.SASR);
outb((value >> 16) & 0xff, regs.SCMD);
outb((value >> 8) & 0xff, regs.SCMD);
outb( value & 0xff, regs.SCMD);
}
#define write_wd33c93_cmd(regs, cmd) \
write_wd33c93((regs), WD_COMMAND, (cmd))
static inline void
write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
{
int i;
outb(WD_CDB_1, regs.SASR);
for (i=0; i<len; i++)
outb(cmnd[i], regs.SCMD);
}
#else /* CONFIG_WD33C93_PIO */
static inline uchar
read_wd33c93(const wd33c93_regs regs, uchar reg_num)
{
*regs.SASR = reg_num;
mb();
return (*regs.SCMD);
}
static unsigned long
read_wd33c93_count(const wd33c93_regs regs)
{
unsigned long value;
*regs.SASR = WD_TRANSFER_COUNT_MSB;
mb();
value = *regs.SCMD << 16;
value |= *regs.SCMD << 8;
value |= *regs.SCMD;
mb();
return value;
}
static inline uchar
read_aux_stat(const wd33c93_regs regs)
{
return *regs.SASR;
}
static inline void
write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value)
{
*regs.SASR = reg_num;
mb();
*regs.SCMD = value;
mb();
}
static void
write_wd33c93_count(const wd33c93_regs regs, unsigned long value)
{
*regs.SASR = WD_TRANSFER_COUNT_MSB;
mb();
*regs.SCMD = value >> 16;
*regs.SCMD = value >> 8;
*regs.SCMD = value;
mb();
}
static inline void
write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd)
{
*regs.SASR = WD_COMMAND;
mb();
*regs.SCMD = cmd;
mb();
}
static inline void
write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[])
{
int i;
*regs.SASR = WD_CDB_1;
for (i = 0; i < len; i++)
*regs.SCMD = cmnd[i];
}
#endif /* CONFIG_WD33C93_PIO */
static inline uchar
read_1_byte(const wd33c93_regs regs)
{
uchar asr;
uchar x = 0;
write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80);
do {
asr = read_aux_stat(regs);
if (asr & ASR_DBR)
x = read_wd33c93(regs, WD_DATA);
} while (!(asr & ASR_INT));
return x;
}
static int
round_period(unsigned int period, const struct sx_period *sx_table)
{
int x;
for (x = 1; sx_table[x].period_ns; x++) {
if ((period <= sx_table[x - 0].period_ns) &&
(period > sx_table[x - 1].period_ns)) {
return x;
}
}
return 7;
}
/*
* Calculate Synchronous Transfer Register value from SDTR code.
*/
static uchar
calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast,
const struct sx_period *sx_table)
{
/* When doing Fast SCSI synchronous data transfers, the corresponding
* value in 'sx_table' is two times the actually used transfer period.
*/
uchar result;
if (offset && fast) {
fast = STR_FSS;
period *= 2;
} else {
fast = 0;
}
period *= 4; /* convert SDTR code to ns */
result = sx_table[round_period(period,sx_table)].reg_value;
result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF;
result |= fast;
return result;
}
/*
* Calculate SDTR code bytes [3],[4] from period and offset.
*/
static inline void
calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast,
uchar msg[2])
{
/* 'period' is a "normal"-mode value, like the ones in 'sx_table'. The
* actually used transfer period for Fast SCSI synchronous data
* transfers is half that value.
*/
period /= 4;
if (offset && fast)
period /= 2;
msg[0] = period;
msg[1] = offset;
}
static int
wd33c93_queuecommand_lck(struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
struct WD33C93_hostdata *hostdata;
struct scsi_cmnd *tmp;
hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
DB(DB_QUEUE_COMMAND,
printk("Q-%d-%02x-%ld( ", cmd->device->id, cmd->cmnd[0], cmd->serial_number))
/* Set up a few fields in the scsi_cmnd structure for our own use:
* - host_scribble is the pointer to the next cmd in the input queue
* - scsi_done points to the routine we call when a cmd is finished
* - result is what you'd expect
*/
cmd->host_scribble = NULL;
cmd->scsi_done = done;
cmd->result = 0;
/* We use the Scsi_Pointer structure that's included with each command
* as a scratchpad (as it's intended to be used!). The handy thing about
* the SCp.xxx fields is that they're always associated with a given
* cmd, and are preserved across disconnect-reselect. This means we
* can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
* if we keep all the critical pointers and counters in SCp:
* - SCp.ptr is the pointer into the RAM buffer
* - SCp.this_residual is the size of that buffer
* - SCp.buffer points to the current scatter-gather buffer
* - SCp.buffers_residual tells us how many S.G. buffers there are
* - SCp.have_data_in is not used
* - SCp.sent_command is not used
* - SCp.phase records this command's SRCID_ER bit setting
*/
if (scsi_bufflen(cmd)) {
cmd->SCp.buffer = scsi_sglist(cmd);
cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
cmd->SCp.this_residual = cmd->SCp.buffer->length;
} else {
cmd->SCp.buffer = NULL;
cmd->SCp.buffers_residual = 0;
cmd->SCp.ptr = NULL;
cmd->SCp.this_residual = 0;
}
/* WD docs state that at the conclusion of a "LEVEL2" command, the
* status byte can be retrieved from the LUN register. Apparently,
* this is the case only for *uninterrupted* LEVEL2 commands! If
* there are any unexpected phases entered, even if they are 100%
* legal (different devices may choose to do things differently),
* the LEVEL2 command sequence is exited. This often occurs prior
* to receiving the status byte, in which case the driver does a
* status phase interrupt and gets the status byte on its own.
* While such a command can then be "resumed" (ie restarted to
* finish up as a LEVEL2 command), the LUN register will NOT be
* a valid status byte at the command's conclusion, and we must
* use the byte obtained during the earlier interrupt. Here, we
* preset SCp.Status to an illegal value (0xff) so that when
* this command finally completes, we can tell where the actual
* status byte is stored.
*/
cmd->SCp.Status = ILLEGAL_STATUS_BYTE;
/*
* Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE
* commands are added to the head of the queue so that the desired
* sense data is not lost before REQUEST_SENSE executes.
*/
spin_lock_irq(&hostdata->lock);
if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
cmd->host_scribble = (uchar *) hostdata->input_Q;
hostdata->input_Q = cmd;
} else { /* find the end of the queue */
for (tmp = (struct scsi_cmnd *) hostdata->input_Q;
tmp->host_scribble;
tmp = (struct scsi_cmnd *) tmp->host_scribble) ;
tmp->host_scribble = (uchar *) cmd;
}
/* We know that there's at least one command in 'input_Q' now.
* Go see if any of them are runnable!
*/
wd33c93_execute(cmd->device->host);
DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->serial_number))
spin_unlock_irq(&hostdata->lock);
return 0;
}
DEF_SCSI_QCMD(wd33c93_queuecommand)
/*
* This routine attempts to start a scsi command. If the host_card is
* already connected, we give up immediately. Otherwise, look through
* the input_Q, using the first command we find that's intended
* for a currently non-busy target/lun.
*
* wd33c93_execute() is always called with interrupts disabled or from
* the wd33c93_intr itself, which means that a wd33c93 interrupt
* cannot occur while we are in here.
*/
static void
wd33c93_execute(struct Scsi_Host *instance)
{
struct WD33C93_hostdata *hostdata =
(struct WD33C93_hostdata *) instance->hostdata;
const wd33c93_regs regs = hostdata->regs;
struct scsi_cmnd *cmd, *prev;
DB(DB_EXECUTE, printk("EX("))
if (hostdata->selecting || hostdata->connected) {
DB(DB_EXECUTE, printk(")EX-0 "))
return;
}
/*
* Search through the input_Q for a command destined
* for an idle target/lun.
*/
cmd = (struct scsi_cmnd *) hostdata->input_Q;
prev = NULL;
while (cmd) {
if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)))
break;
prev = cmd;
cmd = (struct scsi_cmnd *) cmd->host_scribble;
}
/* quit if queue empty or all possible targets are busy */
if (!cmd) {
DB(DB_EXECUTE, printk(")EX-1 "))
return;
}
/* remove command from queue */
if (prev)
prev->host_scribble = cmd->host_scribble;
else
hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble;
#ifdef PROC_STATISTICS
hostdata->cmd_cnt[cmd->device->id]++;
#endif
/*
* Start the selection process
*/
if (cmd->sc_data_direction == DMA_TO_DEVICE)
write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
else
write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD);
/* Now we need to figure out whether or not this command is a good
* candidate for disconnect/reselect. We guess to the best of our
* ability, based on a set of hierarchical rules. When several
* devices are operating simultaneously, disconnects are usually
* an advantage. In a single device system, or if only 1 device
* is being accessed, transfers usually go faster if disconnects
* are not allowed:
*
* + Commands should NEVER disconnect if hostdata->disconnect =
* DIS_NEVER (this holds for tape drives also), and ALWAYS
* disconnect if hostdata->disconnect = DIS_ALWAYS.
* + Tape drive commands should always be allowed to disconnect.
* + Disconnect should be allowed if disconnected_Q isn't empty.
* + Commands should NOT disconnect if input_Q is empty.
* + Disconnect should be allowed if there are commands in input_Q
* for a different target/lun. In this case, the other commands
* should be made disconnect-able, if not already.
*
* I know, I know - this code would flunk me out of any
* "C Programming 101" class ever offered. But it's easy
* to change around and experiment with for now.
*/
cmd->SCp.phase = 0; /* assume no disconnect */
if (hostdata->disconnect == DIS_NEVER)
goto no;
if (hostdata->disconnect == DIS_ALWAYS)
goto yes;
if (cmd->device->type == 1) /* tape drive? */
goto yes;
if (hostdata->disconnected_Q) /* other commands disconnected? */
goto yes;
if (!(hostdata->input_Q)) /* input_Q empty? */
goto no;
for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
prev = (struct scsi_cmnd *) prev->host_scribble) {
if ((prev->device->id != cmd->device->id) ||
(prev->device->lun != cmd->device->lun)) {
for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev;
prev = (struct scsi_cmnd *) prev->host_scribble)
prev->SCp.phase = 1;
goto yes;
}
}
goto no;
yes:
cmd->SCp.phase = 1;
#ifdef PROC_STATISTICS
hostdata->disc_allowed_cnt[cmd->device->id]++;
#endif
no:
write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0));
write_wd33c93(regs, WD_TARGET_LUN, cmd->device->lun);
write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
hostdata->sync_xfer[cmd->device->id]);
hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
if ((hostdata->level2 == L2_NONE) ||
(hostdata->sync_stat[cmd->device->id] == SS_UNSET)) {
/*
* Do a 'Select-With-ATN' command. This will end with
* one of the following interrupts:
* CSR_RESEL_AM: failure - can try again later.
* CSR_TIMEOUT: failure - give up.
* CSR_SELECT: success - proceed.
*/
hostdata->selecting = cmd;
/* Every target has its own synchronous transfer setting, kept in the
* sync_xfer array, and a corresponding status byte in sync_stat[].
* Each target's sync_stat[] entry is initialized to SX_UNSET, and its
* sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
* means that the parameters are undetermined as yet, and that we
* need to send an SDTR message to this device after selection is
* complete: We set SS_FIRST to tell the interrupt routine to do so.
* If we've been asked not to try synchronous transfers on this
* target (and _all_ luns within it), we'll still send the SDTR message
* later, but at that time we'll negotiate for async by specifying a
* sync fifo depth of 0.
*/
if (hostdata->sync_stat[cmd->device->id] == SS_UNSET)
hostdata->sync_stat[cmd->device->id] = SS_FIRST;
hostdata->state = S_SELECTING;
write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN);
} else {
/*
* Do a 'Select-With-ATN-Xfer' command. This will end with
* one of the following interrupts:
* CSR_RESEL_AM: failure - can try again later.
* CSR_TIMEOUT: failure - give up.
* anything else: success - proceed.
*/
hostdata->connected = cmd;
write_wd33c93(regs, WD_COMMAND_PHASE, 0);
/* copy command_descriptor_block into WD chip
* (take advantage of auto-incrementing)
*/
write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd);
/* The wd33c93 only knows about Group 0, 1, and 5 commands when
* it's doing a 'select-and-transfer'. To be safe, we write the
* size of the CDB into the OWN_ID register for every case. This
* way there won't be problems with vendor-unique, audio, etc.
*/
write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len);
/* When doing a non-disconnect command with DMA, we can save
* ourselves a DATA phase interrupt later by setting everything
* up ahead of time.
*/
if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) {
if (hostdata->dma_setup(cmd,
(cmd->sc_data_direction == DMA_TO_DEVICE) ?
DATA_OUT_DIR : DATA_IN_DIR))
write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */
else {
write_wd33c93_count(regs,
cmd->SCp.this_residual);
write_wd33c93(regs, WD_CONTROL,
CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
hostdata->dma = D_DMA_RUNNING;
}
} else
write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */
hostdata->state = S_RUNNING_LEVEL2;
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
}
/*
* Since the SCSI bus can handle only 1 connection at a time,
* we get out of here now. If the selection fails, or when
* the command disconnects, we'll come back to this routine
* to search the input_Q again...
*/
DB(DB_EXECUTE,
printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->serial_number))
}
static void
transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt,
int data_in_dir, struct WD33C93_hostdata *hostdata)
{
uchar asr;
DB(DB_TRANSFER,
printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out"))
write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
write_wd33c93_count(regs, cnt);
write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
if (data_in_dir) {
do {
asr = read_aux_stat(regs);
if (asr & ASR_DBR)
*buf++ = read_wd33c93(regs, WD_DATA);
} while (!(asr & ASR_INT));
} else {
do {
asr = read_aux_stat(regs);
if (asr & ASR_DBR)
write_wd33c93(regs, WD_DATA, *buf++);
} while (!(asr & ASR_INT));
}
/* Note: we are returning with the interrupt UN-cleared.
* Since (presumably) an entire I/O operation has
* completed, the bus phase is probably different, and
* the interrupt routine will discover this when it
* responds to the uncleared int.
*/
}
static void
transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
int data_in_dir)
{
struct WD33C93_hostdata *hostdata;
unsigned long length;
hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata;
/* Normally, you'd expect 'this_residual' to be non-zero here.
* In a series of scatter-gather transfers, however, this
* routine will usually be called with 'this_residual' equal
* to 0 and 'buffers_residual' non-zero. This means that a
* previous transfer completed, clearing 'this_residual', and
* now we need to setup the next scatter-gather buffer as the
* source or destination for THIS transfer.
*/
if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
++cmd->SCp.buffer;
--cmd->SCp.buffers_residual;
cmd->SCp.this_residual = cmd->SCp.buffer->length;
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
}
if (!cmd->SCp.this_residual) /* avoid bogus setups */
return;
write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
hostdata->sync_xfer[cmd->device->id]);
/* 'hostdata->no_dma' is TRUE if we don't even want to try DMA.
* Update 'this_residual' and 'ptr' after 'transfer_pio()' returns.
*/
if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) {
#ifdef PROC_STATISTICS
hostdata->pio_cnt++;
#endif
transfer_pio(regs, (uchar *) cmd->SCp.ptr,
cmd->SCp.this_residual, data_in_dir, hostdata);
length = cmd->SCp.this_residual;
cmd->SCp.this_residual = read_wd33c93_count(regs);
cmd->SCp.ptr += (length - cmd->SCp.this_residual);
}
/* We are able to do DMA (in fact, the Amiga hardware is
* already going!), so start up the wd33c93 in DMA mode.
* We set 'hostdata->dma' = D_DMA_RUNNING so that when the
* transfer completes and causes an interrupt, we're
* reminded to tell the Amiga to shut down its end. We'll
* postpone the updating of 'this_residual' and 'ptr'
* until then.
*/
else {
#ifdef PROC_STATISTICS
hostdata->dma_cnt++;
#endif
write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode);
write_wd33c93_count(regs, cmd->SCp.this_residual);
if ((hostdata->level2 >= L2_DATA) ||
(hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) {
write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
hostdata->state = S_RUNNING_LEVEL2;
} else
write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO);
hostdata->dma = D_DMA_RUNNING;
}
}
void
wd33c93_intr(struct Scsi_Host *instance)
{
struct WD33C93_hostdata *hostdata =
(struct WD33C93_hostdata *) instance->hostdata;
const wd33c93_regs regs = hostdata->regs;
struct scsi_cmnd *patch, *cmd;
uchar asr, sr, phs, id, lun, *ucp, msg;
unsigned long length, flags;
asr = read_aux_stat(regs);
if (!(asr & ASR_INT) || (asr & ASR_BSY))
return;
spin_lock_irqsave(&hostdata->lock, flags);
#ifdef PROC_STATISTICS
hostdata->int_cnt++;
#endif
cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */
sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear the interrupt */
phs = read_wd33c93(regs, WD_COMMAND_PHASE);
DB(DB_INTR, printk("{%02x:%02x-", asr, sr))
/* After starting a DMA transfer, the next interrupt
* is guaranteed to be in response to completion of
* the transfer. Since the Amiga DMA hardware runs in
* in an open-ended fashion, it needs to be told when
* to stop; do that here if D_DMA_RUNNING is true.
* Also, we have to update 'this_residual' and 'ptr'
* based on the contents of the TRANSFER_COUNT register,
* in case the device decided to do an intermediate
* disconnect (a device may do this if it has to do a
* seek, or just to be nice and let other devices have
* some bus time during long transfers). After doing
* whatever is needed, we go on and service the WD3393
* interrupt normally.
*/
if (hostdata->dma == D_DMA_RUNNING) {
DB(DB_TRANSFER,
printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual))
hostdata->dma_stop(cmd->device->host, cmd, 1);
hostdata->dma = D_DMA_OFF;
length = cmd->SCp.this_residual;
cmd->SCp.this_residual = read_wd33c93_count(regs);
cmd->SCp.ptr += (length - cmd->SCp.this_residual);
DB(DB_TRANSFER,
printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual))
}
/* Respond to the specific WD3393 interrupt - there are quite a few! */
switch (sr) {
case CSR_TIMEOUT:
DB(DB_INTR, printk("TIMEOUT"))
if (hostdata->state == S_RUNNING_LEVEL2)
hostdata->connected = NULL;
else {
cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */
hostdata->selecting = NULL;
}
cmd->result = DID_NO_CONNECT << 16;
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
hostdata->state = S_UNCONNECTED;
cmd->scsi_done(cmd);
/* From esp.c:
* There is a window of time within the scsi_done() path
* of execution where interrupts are turned back on full
* blast and left that way. During that time we could
* reconnect to a disconnected command, then we'd bomb
* out below. We could also end up executing two commands
* at _once_. ...just so you know why the restore_flags()
* is here...
*/
spin_unlock_irqrestore(&hostdata->lock, flags);
/* We are not connected to a target - check to see if there
* are commands waiting to be executed.
*/
wd33c93_execute(instance);
break;
/* Note: this interrupt should not occur in a LEVEL2 command */
case CSR_SELECT:
DB(DB_INTR, printk("SELECT"))
hostdata->connected = cmd =
(struct scsi_cmnd *) hostdata->selecting;
hostdata->selecting = NULL;
/* construct an IDENTIFY message with correct disconnect bit */
hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->device->lun);
if (cmd->SCp.phase)
hostdata->outgoing_msg[0] |= 0x40;
if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
hostdata->sync_stat[cmd->device->id] = SS_WAITING;
/* Tack on a 2nd message to ask about synchronous transfers. If we've
* been asked to do only asynchronous transfers on this device, we
* request a fifo depth of 0, which is equivalent to async - should
* solve the problems some people have had with GVP's Guru ROM.
*/
hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
hostdata->outgoing_msg[2] = 3;
hostdata->outgoing_msg[3] = EXTENDED_SDTR;
if (hostdata->no_sync & (1 << cmd->device->id)) {
calc_sync_msg(hostdata->default_sx_per, 0,
0, hostdata->outgoing_msg + 4);
} else {
calc_sync_msg(optimum_sx_per(hostdata),
OPTIMUM_SX_OFF,
hostdata->fast,
hostdata->outgoing_msg + 4);
}
hostdata->outgoing_len = 6;
#ifdef SYNC_DEBUG
ucp = hostdata->outgoing_msg + 1;
printk(" sending SDTR %02x03%02x%02x%02x ",
ucp[0], ucp[2], ucp[3], ucp[4]);
#endif
} else
hostdata->outgoing_len = 1;
hostdata->state = S_CONNECTED;
spin_unlock_irqrestore(&hostdata->lock, flags);
break;
case CSR_XFER_DONE | PHS_DATA_IN:
case CSR_UNEXP | PHS_DATA_IN:
case CSR_SRV_REQ | PHS_DATA_IN:
DB(DB_INTR,
printk("IN-%d.%d", cmd->SCp.this_residual,
cmd->SCp.buffers_residual))
transfer_bytes(regs, cmd, DATA_IN_DIR);
if (hostdata->state != S_RUNNING_LEVEL2)
hostdata->state = S_CONNECTED;
spin_unlock_irqrestore(&hostdata->lock, flags);
break;
case CSR_XFER_DONE | PHS_DATA_OUT:
case CSR_UNEXP | PHS_DATA_OUT:
case CSR_SRV_REQ | PHS_DATA_OUT:
DB(DB_INTR,
printk("OUT-%d.%d", cmd->SCp.this_residual,
cmd->SCp.buffers_residual))
transfer_bytes(regs, cmd, DATA_OUT_DIR);
if (hostdata->state != S_RUNNING_LEVEL2)
hostdata->state = S_CONNECTED;
spin_unlock_irqrestore(&hostdata->lock, flags);
break;
/* Note: this interrupt should not occur in a LEVEL2 command */
case CSR_XFER_DONE | PHS_COMMAND:
case CSR_UNEXP | PHS_COMMAND:
case CSR_SRV_REQ | PHS_COMMAND:
DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->serial_number))
transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR,
hostdata);
hostdata->state = S_CONNECTED;
spin_unlock_irqrestore(&hostdata->lock, flags);
break;
case CSR_XFER_DONE | PHS_STATUS:
case CSR_UNEXP | PHS_STATUS:
case CSR_SRV_REQ | PHS_STATUS:
DB(DB_INTR, printk("STATUS="))
cmd->SCp.Status = read_1_byte(regs);
DB(DB_INTR, printk("%02x", cmd->SCp.Status))
if (hostdata->level2 >= L2_BASIC) {
sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */
udelay(7);
hostdata->state = S_RUNNING_LEVEL2;
write_wd33c93(regs, WD_COMMAND_PHASE, 0x50);
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
} else {
hostdata->state = S_CONNECTED;
}
spin_unlock_irqrestore(&hostdata->lock, flags);
break;
case CSR_XFER_DONE | PHS_MESS_IN:
case CSR_UNEXP | PHS_MESS_IN:
case CSR_SRV_REQ | PHS_MESS_IN:
DB(DB_INTR, printk("MSG_IN="))
msg = read_1_byte(regs);
sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */
udelay(7);
hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
msg = EXTENDED_MESSAGE;
else
hostdata->incoming_ptr = 0;
cmd->SCp.Message = msg;
switch (msg) {
case COMMAND_COMPLETE:
DB(DB_INTR, printk("CCMP-%ld", cmd->serial_number))
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
hostdata->state = S_PRE_CMP_DISC;
break;
case SAVE_POINTERS:
DB(DB_INTR, printk("SDP"))
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
hostdata->state = S_CONNECTED;
break;
case RESTORE_POINTERS:
DB(DB_INTR, printk("RDP"))
if (hostdata->level2 >= L2_BASIC) {
write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
hostdata->state = S_RUNNING_LEVEL2;
} else {
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
hostdata->state = S_CONNECTED;
}
break;
case DISCONNECT:
DB(DB_INTR, printk("DIS"))
cmd->device->disconnect = 1;
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
hostdata->state = S_PRE_TMP_DISC;
break;
case MESSAGE_REJECT:
DB(DB_INTR, printk("REJ"))
#ifdef SYNC_DEBUG
printk("-REJ-");
#endif
if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) {
hostdata->sync_stat[cmd->device->id] = SS_SET;
/* we want default_sx_per, not DEFAULT_SX_PER */
hostdata->sync_xfer[cmd->device->id] =
calc_sync_xfer(hostdata->default_sx_per
/ 4, 0, 0, hostdata->sx_table);
}
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
hostdata->state = S_CONNECTED;
break;
case EXTENDED_MESSAGE:
DB(DB_INTR, printk("EXT"))
ucp = hostdata->incoming_msg;
#ifdef SYNC_DEBUG
printk("%02x", ucp[hostdata->incoming_ptr]);
#endif
/* Is this the last byte of the extended message? */
if ((hostdata->incoming_ptr >= 2) &&
(hostdata->incoming_ptr == (ucp[1] + 1))) {
switch (ucp[2]) { /* what's the EXTENDED code? */
case EXTENDED_SDTR:
/* default to default async period */
id = calc_sync_xfer(hostdata->
default_sx_per / 4, 0,
0, hostdata->sx_table);
if (hostdata->sync_stat[cmd->device->id] !=
SS_WAITING) {
/* A device has sent an unsolicited SDTR message; rather than go
* through the effort of decoding it and then figuring out what
* our reply should be, we're just gonna say that we have a
* synchronous fifo depth of 0. This will result in asynchronous
* transfers - not ideal but so much easier.
* Actually, this is OK because it assures us that if we don't
* specifically ask for sync transfers, we won't do any.
*/
write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
hostdata->outgoing_msg[0] =
EXTENDED_MESSAGE;
hostdata->outgoing_msg[1] = 3;
hostdata->outgoing_msg[2] =
EXTENDED_SDTR;
calc_sync_msg(hostdata->
default_sx_per, 0,
0, hostdata->outgoing_msg + 3);
hostdata->outgoing_len = 5;
} else {
if (ucp[4]) /* well, sync transfer */
id = calc_sync_xfer(ucp[3], ucp[4],
hostdata->fast,
hostdata->sx_table);
else if (ucp[3]) /* very unlikely... */
id = calc_sync_xfer(ucp[3], ucp[4],
0, hostdata->sx_table);
}
hostdata->sync_xfer[cmd->device->id] = id;
#ifdef SYNC_DEBUG
printk(" sync_xfer=%02x\n",
hostdata->sync_xfer[cmd->device->id]);
#endif
hostdata->sync_stat[cmd->device->id] =
SS_SET;
write_wd33c93_cmd(regs,
WD_CMD_NEGATE_ACK);
hostdata->state = S_CONNECTED;
break;
case EXTENDED_WDTR:
write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
printk("sending WDTR ");
hostdata->outgoing_msg[0] =
EXTENDED_MESSAGE;
hostdata->outgoing_msg[1] = 2;
hostdata->outgoing_msg[2] =
EXTENDED_WDTR;
hostdata->outgoing_msg[3] = 0; /* 8 bit transfer width */
hostdata->outgoing_len = 4;
write_wd33c93_cmd(regs,
WD_CMD_NEGATE_ACK);
hostdata->state = S_CONNECTED;
break;
default:
write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
printk
("Rejecting Unknown Extended Message(%02x). ",
ucp[2]);
hostdata->outgoing_msg[0] =
MESSAGE_REJECT;
hostdata->outgoing_len = 1;
write_wd33c93_cmd(regs,
WD_CMD_NEGATE_ACK);
hostdata->state = S_CONNECTED;
break;
}
hostdata->incoming_ptr = 0;
}
/* We need to read more MESS_IN bytes for the extended message */
else {
hostdata->incoming_ptr++;
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
hostdata->state = S_CONNECTED;
}
break;
default:
printk("Rejecting Unknown Message(%02x) ", msg);
write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */
hostdata->outgoing_msg[0] = MESSAGE_REJECT;
hostdata->outgoing_len = 1;
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
hostdata->state = S_CONNECTED;
}
spin_unlock_irqrestore(&hostdata->lock, flags);
break;
/* Note: this interrupt will occur only after a LEVEL2 command */
case CSR_SEL_XFER_DONE:
/* Make sure that reselection is enabled at this point - it may
* have been turned off for the command that just completed.
*/
write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
if (phs == 0x60) {
DB(DB_INTR, printk("SX-DONE-%ld", cmd->serial_number))
cmd->SCp.Message = COMMAND_COMPLETE;
lun = read_wd33c93(regs, WD_TARGET_LUN);
DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
hostdata->connected = NULL;
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
hostdata->state = S_UNCONNECTED;
if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
cmd->SCp.Status = lun;
if (cmd->cmnd[0] == REQUEST_SENSE
&& cmd->SCp.Status != GOOD)
cmd->result =
(cmd->
result & 0x00ffff) | (DID_ERROR << 16);
else
cmd->result =
cmd->SCp.Status | (cmd->SCp.Message << 8);
cmd->scsi_done(cmd);
/* We are no longer connected to a target - check to see if
* there are commands waiting to be executed.
*/
spin_unlock_irqrestore(&hostdata->lock, flags);
wd33c93_execute(instance);
} else {
printk
("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",
asr, sr, phs, cmd->serial_number);
spin_unlock_irqrestore(&hostdata->lock, flags);
}
break;
/* Note: this interrupt will occur only after a LEVEL2 command */
case CSR_SDP:
DB(DB_INTR, printk("SDP"))
hostdata->state = S_RUNNING_LEVEL2;
write_wd33c93(regs, WD_COMMAND_PHASE, 0x41);
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
spin_unlock_irqrestore(&hostdata->lock, flags);
break;
case CSR_XFER_DONE | PHS_MESS_OUT:
case CSR_UNEXP | PHS_MESS_OUT:
case CSR_SRV_REQ | PHS_MESS_OUT:
DB(DB_INTR, printk("MSG_OUT="))
/* To get here, we've probably requested MESSAGE_OUT and have
* already put the correct bytes in outgoing_msg[] and filled
* in outgoing_len. We simply send them out to the SCSI bus.
* Sometimes we get MESSAGE_OUT phase when we're not expecting
* it - like when our SDTR message is rejected by a target. Some
* targets send the REJECT before receiving all of the extended
* message, and then seem to go back to MESSAGE_OUT for a byte
* or two. Not sure why, or if I'm doing something wrong to
* cause this to happen. Regardless, it seems that sending
* NOP messages in these situations results in no harm and
* makes everyone happy.
*/
if (hostdata->outgoing_len == 0) {
hostdata->outgoing_len = 1;
hostdata->outgoing_msg[0] = NOP;
}
transfer_pio(regs, hostdata->outgoing_msg,
hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
hostdata->outgoing_len = 0;
hostdata->state = S_CONNECTED;
spin_unlock_irqrestore(&hostdata->lock, flags);
break;
case CSR_UNEXP_DISC:
/* I think I've seen this after a request-sense that was in response
* to an error condition, but not sure. We certainly need to do
* something when we get this interrupt - the question is 'what?'.
* Let's think positively, and assume some command has finished
* in a legal manner (like a command that provokes a request-sense),
* so we treat it as a normal command-complete-disconnect.
*/
/* Make sure that reselection is enabled at this point - it may
* have been turned off for the command that just completed.
*/
write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
if (cmd == NULL) {
printk(" - Already disconnected! ");
hostdata->state = S_UNCONNECTED;
spin_unlock_irqrestore(&hostdata->lock, flags);
return;
}
DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->serial_number))
hostdata->connected = NULL;
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
hostdata->state = S_UNCONNECTED;
if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
cmd->result =
(cmd->result & 0x00ffff) | (DID_ERROR << 16);
else
cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
cmd->scsi_done(cmd);
/* We are no longer connected to a target - check to see if
* there are commands waiting to be executed.
*/
/* look above for comments on scsi_done() */
spin_unlock_irqrestore(&hostdata->lock, flags);
wd33c93_execute(instance);
break;
case CSR_DISC:
/* Make sure that reselection is enabled at this point - it may
* have been turned off for the command that just completed.
*/
write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER);
DB(DB_INTR, printk("DISC-%ld", cmd->serial_number))
if (cmd == NULL) {
printk(" - Already disconnected! ");
hostdata->state = S_UNCONNECTED;
}
switch (hostdata->state) {
case S_PRE_CMP_DISC:
hostdata->connected = NULL;
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
hostdata->state = S_UNCONNECTED;
DB(DB_INTR, printk(":%d", cmd->SCp.Status))
if (cmd->cmnd[0] == REQUEST_SENSE
&& cmd->SCp.Status != GOOD)
cmd->result =
(cmd->
result & 0x00ffff) | (DID_ERROR << 16);
else
cmd->result =
cmd->SCp.Status | (cmd->SCp.Message << 8);
cmd->scsi_done(cmd);
break;
case S_PRE_TMP_DISC:
case S_RUNNING_LEVEL2:
cmd->host_scribble = (uchar *) hostdata->disconnected_Q;
hostdata->disconnected_Q = cmd;
hostdata->connected = NULL;
hostdata->state = S_UNCONNECTED;
#ifdef PROC_STATISTICS
hostdata->disc_done_cnt[cmd->device->id]++;
#endif
break;
default:
printk("*** Unexpected DISCONNECT interrupt! ***");
hostdata->state = S_UNCONNECTED;
}
/* We are no longer connected to a target - check to see if
* there are commands waiting to be executed.
*/
spin_unlock_irqrestore(&hostdata->lock, flags);
wd33c93_execute(instance);
break;
case CSR_RESEL_AM:
case CSR_RESEL:
DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : ""))
/* Old chips (pre -A ???) don't have advanced features and will
* generate CSR_RESEL. In that case we have to extract the LUN the
* hard way (see below).
* First we have to make sure this reselection didn't
* happen during Arbitration/Selection of some other device.
* If yes, put losing command back on top of input_Q.
*/
if (hostdata->level2 <= L2_NONE) {
if (hostdata->selecting) {
cmd = (struct scsi_cmnd *) hostdata->selecting;
hostdata->selecting = NULL;
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
cmd->host_scribble =
(uchar *) hostdata->input_Q;
hostdata->input_Q = cmd;
}
}
else {
if (cmd) {
if (phs == 0x00) {
hostdata->busy[cmd->device->id] &=
~(1 << cmd->device->lun);
cmd->host_scribble =
(uchar *) hostdata->input_Q;
hostdata->input_Q = cmd;
} else {
printk
("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",
asr, sr, phs);
while (1)
printk("\r");
}
}
}
/* OK - find out which device reselected us. */
id = read_wd33c93(regs, WD_SOURCE_ID);
id &= SRCID_MASK;
/* and extract the lun from the ID message. (Note that we don't
* bother to check for a valid message here - I guess this is
* not the right way to go, but...)
*/
if (sr == CSR_RESEL_AM) {
lun = read_wd33c93(regs, WD_DATA);
if (hostdata->level2 < L2_RESELECT)
write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK);
lun &= 7;
} else {
/* Old chip; wait for msgin phase to pick up the LUN. */
for (lun = 255; lun; lun--) {
if ((asr = read_aux_stat(regs)) & ASR_INT)
break;
udelay(10);
}
if (!(asr & ASR_INT)) {
printk
("wd33c93: Reselected without IDENTIFY\n");
lun = 0;
} else {
/* Verify this is a change to MSG_IN and read the message */
sr = read_wd33c93(regs, WD_SCSI_STATUS);
udelay(7);
if (sr == (CSR_ABORT | PHS_MESS_IN) ||
sr == (CSR_UNEXP | PHS_MESS_IN) ||
sr == (CSR_SRV_REQ | PHS_MESS_IN)) {
/* Got MSG_IN, grab target LUN */
lun = read_1_byte(regs);
/* Now we expect a 'paused with ACK asserted' int.. */
asr = read_aux_stat(regs);
if (!(asr & ASR_INT)) {
udelay(10);
asr = read_aux_stat(regs);
if (!(asr & ASR_INT))
printk
("wd33c93: No int after LUN on RESEL (%02x)\n",
asr);
}
sr = read_wd33c93(regs, WD_SCSI_STATUS);
udelay(7);
if (sr != CSR_MSGIN)
printk
("wd33c93: Not paused with ACK on RESEL (%02x)\n",
sr);
lun &= 7;
write_wd33c93_cmd(regs,
WD_CMD_NEGATE_ACK);
} else {
printk
("wd33c93: Not MSG_IN on reselect (%02x)\n",
sr);
lun = 0;
}
}
}
/* Now we look for the command that's reconnecting. */
cmd = (struct scsi_cmnd *) hostdata->disconnected_Q;
patch = NULL;
while (cmd) {
if (id == cmd->device->id && lun == cmd->device->lun)
break;
patch = cmd;
cmd = (struct scsi_cmnd *) cmd->host_scribble;
}
/* Hmm. Couldn't find a valid command.... What to do? */
if (!cmd) {
printk
("---TROUBLE: target %d.%d not in disconnect queue---",
id, lun);
spin_unlock_irqrestore(&hostdata->lock, flags);
return;
}
/* Ok, found the command - now start it up again. */
if (patch)
patch->host_scribble = cmd->host_scribble;
else
hostdata->disconnected_Q =
(struct scsi_cmnd *) cmd->host_scribble;
hostdata->connected = cmd;
/* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
* because these things are preserved over a disconnect.
* But we DO need to fix the DPD bit so it's correct for this command.
*/
if (cmd->sc_data_direction == DMA_TO_DEVICE)
write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id);
else
write_wd33c93(regs, WD_DESTINATION_ID,
cmd->device->id | DSTID_DPD);
if (hostdata->level2 >= L2_RESELECT) {
write_wd33c93_count(regs, 0); /* we want a DATA_PHASE interrupt */
write_wd33c93(regs, WD_COMMAND_PHASE, 0x45);
write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER);
hostdata->state = S_RUNNING_LEVEL2;
} else
hostdata->state = S_CONNECTED;
DB(DB_INTR, printk("-%ld", cmd->serial_number))
spin_unlock_irqrestore(&hostdata->lock, flags);
break;
default:
printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
spin_unlock_irqrestore(&hostdata->lock, flags);
}
DB(DB_INTR, printk("} "))
}
static void
reset_wd33c93(struct Scsi_Host *instance)
{
struct WD33C93_hostdata *hostdata =
(struct WD33C93_hostdata *) instance->hostdata;
const wd33c93_regs regs = hostdata->regs;
uchar sr;
#ifdef CONFIG_SGI_IP22
{
int busycount = 0;
extern void sgiwd93_reset(unsigned long);
/* wait 'til the chip gets some time for us */
while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100)
udelay (10);
/*
* there are scsi devices out there, which manage to lock up
* the wd33c93 in a busy condition. In this state it won't
* accept the reset command. The only way to solve this is to
* give the chip a hardware reset (if possible). The code below
* does this for the SGI Indy, where this is possible
*/
/* still busy ? */
if (read_aux_stat(regs) & ASR_BSY)
sgiwd93_reset(instance->base); /* yeah, give it the hard one */
}
#endif
write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF |
instance->this_id | hostdata->clock_freq);
write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER,
calc_sync_xfer(hostdata->default_sx_per / 4,
DEFAULT_SX_OFF, 0, hostdata->sx_table));
write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET);
#ifdef CONFIG_MVME147_SCSI
udelay(25); /* The old wd33c93 on MVME147 needs this, at least */
#endif
while (!(read_aux_stat(regs) & ASR_INT))
;
sr = read_wd33c93(regs, WD_SCSI_STATUS);
hostdata->microcode = read_wd33c93(regs, WD_CDB_1);
if (sr == 0x00)
hostdata->chip = C_WD33C93;
else if (sr == 0x01) {
write_wd33c93(regs, WD_QUEUE_TAG, 0xa5); /* any random number */
sr = read_wd33c93(regs, WD_QUEUE_TAG);
if (sr == 0xa5) {
hostdata->chip = C_WD33C93B;
write_wd33c93(regs, WD_QUEUE_TAG, 0);
} else
hostdata->chip = C_WD33C93A;
} else
hostdata->chip = C_UNKNOWN_CHIP;
if (hostdata->chip != C_WD33C93B) /* Fast SCSI unavailable */
hostdata->fast = 0;
write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
}
int
wd33c93_host_reset(struct scsi_cmnd * SCpnt)
{
struct Scsi_Host *instance;
struct WD33C93_hostdata *hostdata;
int i;
instance = SCpnt->device->host;
hostdata = (struct WD33C93_hostdata *) instance->hostdata;
printk("scsi%d: reset. ", instance->host_no);
disable_irq(instance->irq);
hostdata->dma_stop(instance, NULL, 0);
for (i = 0; i < 8; i++) {
hostdata->busy[i] = 0;
hostdata->sync_xfer[i] =
calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
0, hostdata->sx_table);
hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */
}
hostdata->input_Q = NULL;
hostdata->selecting = NULL;
hostdata->connected = NULL;
hostdata->disconnected_Q = NULL;
hostdata->state = S_UNCONNECTED;
hostdata->dma = D_DMA_OFF;
hostdata->incoming_ptr = 0;
hostdata->outgoing_len = 0;
reset_wd33c93(instance);
SCpnt->result = DID_RESET << 16;
enable_irq(instance->irq);
return SUCCESS;
}
int
wd33c93_abort(struct scsi_cmnd * cmd)
{
struct Scsi_Host *instance;
struct WD33C93_hostdata *hostdata;
wd33c93_regs regs;
struct scsi_cmnd *tmp, *prev;
disable_irq(cmd->device->host->irq);
instance = cmd->device->host;
hostdata = (struct WD33C93_hostdata *) instance->hostdata;
regs = hostdata->regs;
/*
* Case 1 : If the command hasn't been issued yet, we simply remove it
* from the input_Q.
*/
tmp = (struct scsi_cmnd *) hostdata->input_Q;
prev = NULL;
while (tmp) {
if (tmp == cmd) {
if (prev)
prev->host_scribble = cmd->host_scribble;
else
hostdata->input_Q =
(struct scsi_cmnd *) cmd->host_scribble;
cmd->host_scribble = NULL;
cmd->result = DID_ABORT << 16;
printk
("scsi%d: Abort - removing command %ld from input_Q. ",
instance->host_no, cmd->serial_number);
enable_irq(cmd->device->host->irq);
cmd->scsi_done(cmd);
return SUCCESS;
}
prev = tmp;
tmp = (struct scsi_cmnd *) tmp->host_scribble;
}
/*
* Case 2 : If the command is connected, we're going to fail the abort
* and let the high level SCSI driver retry at a later time or
* issue a reset.
*
* Timeouts, and therefore aborted commands, will be highly unlikely
* and handling them cleanly in this situation would make the common
* case of noresets less efficient, and would pollute our code. So,
* we fail.
*/
if (hostdata->connected == cmd) {
uchar sr, asr;
unsigned long timeout;
printk("scsi%d: Aborting connected command %ld - ",
instance->host_no, cmd->serial_number);
printk("stopping DMA - ");
if (hostdata->dma == D_DMA_RUNNING) {
hostdata->dma_stop(instance, cmd, 0);
hostdata->dma = D_DMA_OFF;
}
printk("sending wd33c93 ABORT command - ");
write_wd33c93(regs, WD_CONTROL,
CTRL_IDI | CTRL_EDI | CTRL_POLLED);
write_wd33c93_cmd(regs, WD_CMD_ABORT);
/* Now we have to attempt to flush out the FIFO... */
printk("flushing fifo - ");
timeout = 1000000;
do {
asr = read_aux_stat(regs);
if (asr & ASR_DBR)
read_wd33c93(regs, WD_DATA);
} while (!(asr & ASR_INT) && timeout-- > 0);
sr = read_wd33c93(regs, WD_SCSI_STATUS);
printk
("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
asr, sr, read_wd33c93_count(regs), timeout);
/*
* Abort command processed.
* Still connected.
* We must disconnect.
*/
printk("sending wd33c93 DISCONNECT command - ");
write_wd33c93_cmd(regs, WD_CMD_DISCONNECT);
timeout = 1000000;
asr = read_aux_stat(regs);
while ((asr & ASR_CIP) && timeout-- > 0)
asr = read_aux_stat(regs);
sr = read_wd33c93(regs, WD_SCSI_STATUS);
printk("asr=%02x, sr=%02x.", asr, sr);
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
hostdata->connected = NULL;
hostdata->state = S_UNCONNECTED;
cmd->result = DID_ABORT << 16;
/* sti();*/
wd33c93_execute(instance);
enable_irq(cmd->device->host->irq);
cmd->scsi_done(cmd);
return SUCCESS;
}
/*
* Case 3: If the command is currently disconnected from the bus,
* we're not going to expend much effort here: Let's just return
* an ABORT_SNOOZE and hope for the best...
*/
tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
while (tmp) {
if (tmp == cmd) {
printk
("scsi%d: Abort - command %ld found on disconnected_Q - ",
instance->host_no, cmd->serial_number);
printk("Abort SNOOZE. ");
enable_irq(cmd->device->host->irq);
return FAILED;
}
tmp = (struct scsi_cmnd *) tmp->host_scribble;
}
/*
* Case 4 : If we reached this point, the command was not found in any of
* the queues.
*
* We probably reached this point because of an unlikely race condition
* between the command completing successfully and the abortion code,
* so we won't panic, but we will notify the user in case something really
* broke.
*/
/* sti();*/
wd33c93_execute(instance);
enable_irq(cmd->device->host->irq);
printk("scsi%d: warning : SCSI command probably completed successfully"
" before abortion. ", instance->host_no);
return FAILED;
}
#define MAX_WD33C93_HOSTS 4
#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
#define SETUP_BUFFER_SIZE 200
static char setup_buffer[SETUP_BUFFER_SIZE];
static char setup_used[MAX_SETUP_ARGS];
static int done_setup = 0;
static int
wd33c93_setup(char *str)
{
int i;
char *p1, *p2;
/* The kernel does some processing of the command-line before calling
* this function: If it begins with any decimal or hex number arguments,
* ints[0] = how many numbers found and ints[1] through [n] are the values
* themselves. str points to where the non-numeric arguments (if any)
* start: We do our own parsing of those. We construct synthetic 'nosync'
* keywords out of numeric args (to maintain compatibility with older
* versions) and then add the rest of the arguments.
*/
p1 = setup_buffer;
*p1 = '\0';
if (str)
strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
p1 = setup_buffer;
i = 0;
while (*p1 && (i < MAX_SETUP_ARGS)) {
p2 = strchr(p1, ',');
if (p2) {
*p2 = '\0';
if (p1 != p2)
setup_args[i] = p1;
p1 = p2 + 1;
i++;
} else {
setup_args[i] = p1;
break;
}
}
for (i = 0; i < MAX_SETUP_ARGS; i++)
setup_used[i] = 0;
done_setup = 1;
return 1;
}
__setup("wd33c93=", wd33c93_setup);
/* check_setup_args() returns index if key found, 0 if not
*/
static int
check_setup_args(char *key, int *flags, int *val, char *buf)
{
int x;
char *cp;
for (x = 0; x < MAX_SETUP_ARGS; x++) {
if (setup_used[x])
continue;
if (!strncmp(setup_args[x], key, strlen(key)))
break;
if (!strncmp(setup_args[x], "next", strlen("next")))
return 0;
}
if (x == MAX_SETUP_ARGS)
return 0;
setup_used[x] = 1;
cp = setup_args[x] + strlen(key);
*val = -1;
if (*cp != ':')
return ++x;
cp++;
if ((*cp >= '0') && (*cp <= '9')) {
*val = simple_strtoul(cp, NULL, 0);
}
return ++x;
}
/*
* Calculate internal data-transfer-clock cycle from input-clock
* frequency (/MHz) and fill 'sx_table'.
*
* The original driver used to rely on a fixed sx_table, containing periods
* for (only) the lower limits of the respective input-clock-frequency ranges
* (8-10/12-15/16-20 MHz). Although it seems, that no problems ocurred with
* this setting so far, it might be desirable to adjust the transfer periods
* closer to the really attached, possibly 25% higher, input-clock, since
* - the wd33c93 may really use a significant shorter period, than it has
* negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz
* instead).
* - the wd33c93 may ask the target for a lower transfer rate, than the target
* is capable of (eg. negotiating for an assumed minimum of 252ns instead of
* possible 200ns, which indeed shows up in tests as an approx. 10% lower
* transfer rate).
*/
static inline unsigned int
round_4(unsigned int x)
{
switch (x & 3) {
case 1: --x;
break;
case 2: ++x;
case 3: ++x;
}
return x;
}
static void
calc_sx_table(unsigned int mhz, struct sx_period sx_table[9])
{
unsigned int d, i;
if (mhz < 11)
d = 2; /* divisor for 8-10 MHz input-clock */
else if (mhz < 16)
d = 3; /* divisor for 12-15 MHz input-clock */
else
d = 4; /* divisor for 16-20 MHz input-clock */
d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */
sx_table[0].period_ns = 1;
sx_table[0].reg_value = 0x20;
for (i = 1; i < 8; i++) {
sx_table[i].period_ns = round_4((i+1)*d / 100);
sx_table[i].reg_value = (i+1)*0x10;
}
sx_table[7].reg_value = 0;
sx_table[8].period_ns = 0;
sx_table[8].reg_value = 0;
}
/*
* check and, maybe, map an init- or "clock:"- argument.
*/
static uchar
set_clk_freq(int freq, int *mhz)
{
int x = freq;
if (WD33C93_FS_8_10 == freq)
freq = 8;
else if (WD33C93_FS_12_15 == freq)
freq = 12;
else if (WD33C93_FS_16_20 == freq)
freq = 16;
else if (freq > 7 && freq < 11)
x = WD33C93_FS_8_10;
else if (freq > 11 && freq < 16)
x = WD33C93_FS_12_15;
else if (freq > 15 && freq < 21)
x = WD33C93_FS_16_20;
else {
/* Hmm, wouldn't it be safer to assume highest freq here? */
x = WD33C93_FS_8_10;
freq = 8;
}
*mhz = freq;
return x;
}
/*
* to be used with the resync: fast: ... options
*/
static inline void set_resync ( struct WD33C93_hostdata *hd, int mask )
{
int i;
for (i = 0; i < 8; i++)
if (mask & (1 << i))
hd->sync_stat[i] = SS_UNSET;
}
void
wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
dma_setup_t setup, dma_stop_t stop, int clock_freq)
{
struct WD33C93_hostdata *hostdata;
int i;
int flags;
int val;
char buf[32];
if (!done_setup && setup_strings)
wd33c93_setup(setup_strings);
hostdata = (struct WD33C93_hostdata *) instance->hostdata;
hostdata->regs = regs;
hostdata->clock_freq = set_clk_freq(clock_freq, &i);
calc_sx_table(i, hostdata->sx_table);
hostdata->dma_setup = setup;
hostdata->dma_stop = stop;
hostdata->dma_bounce_buffer = NULL;
hostdata->dma_bounce_len = 0;
for (i = 0; i < 8; i++) {
hostdata->busy[i] = 0;
hostdata->sync_xfer[i] =
calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
0, hostdata->sx_table);
hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */
#ifdef PROC_STATISTICS
hostdata->cmd_cnt[i] = 0;
hostdata->disc_allowed_cnt[i] = 0;
hostdata->disc_done_cnt[i] = 0;
#endif
}
hostdata->input_Q = NULL;
hostdata->selecting = NULL;
hostdata->connected = NULL;
hostdata->disconnected_Q = NULL;
hostdata->state = S_UNCONNECTED;
hostdata->dma = D_DMA_OFF;
hostdata->level2 = L2_BASIC;
hostdata->disconnect = DIS_ADAPTIVE;
hostdata->args = DEBUG_DEFAULTS;
hostdata->incoming_ptr = 0;
hostdata->outgoing_len = 0;
hostdata->default_sx_per = DEFAULT_SX_PER;
hostdata->no_dma = 0; /* default is DMA enabled */
#ifdef PROC_INTERFACE
hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |
PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
#ifdef PROC_STATISTICS
hostdata->dma_cnt = 0;
hostdata->pio_cnt = 0;
hostdata->int_cnt = 0;
#endif
#endif
if (check_setup_args("clock", &flags, &val, buf)) {
hostdata->clock_freq = set_clk_freq(val, &val);
calc_sx_table(val, hostdata->sx_table);
}
if (check_setup_args("nosync", &flags, &val, buf))
hostdata->no_sync = val;
if (check_setup_args("nodma", &flags, &val, buf))
hostdata->no_dma = (val == -1) ? 1 : val;
if (check_setup_args("period", &flags, &val, buf))
hostdata->default_sx_per =
hostdata->sx_table[round_period((unsigned int) val,
hostdata->sx_table)].period_ns;
if (check_setup_args("disconnect", &flags, &val, buf)) {
if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
hostdata->disconnect = val;
else
hostdata->disconnect = DIS_ADAPTIVE;
}
if (check_setup_args("level2", &flags, &val, buf))
hostdata->level2 = val;
if (check_setup_args("debug", &flags, &val, buf))
hostdata->args = val & DB_MASK;
if (check_setup_args("burst", &flags, &val, buf))
hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA;
if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */
&& check_setup_args("fast", &flags, &val, buf))
hostdata->fast = !!val;
if ((i = check_setup_args("next", &flags, &val, buf))) {
while (i)
setup_used[--i] = 1;
}
#ifdef PROC_INTERFACE
if (check_setup_args("proc", &flags, &val, buf))
hostdata->proc = val;
#endif
spin_lock_irq(&hostdata->lock);
reset_wd33c93(instance);
spin_unlock_irq(&hostdata->lock);
printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",
instance->host_no,
(hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==
C_WD33C93A) ?
"WD33c93A" : (hostdata->chip ==
C_WD33C93B) ? "WD33c93B" : "unknown",
hostdata->microcode, hostdata->no_sync, hostdata->no_dma);
#ifdef DEBUGGING_ON
printk(" debug_flags=0x%02x\n", hostdata->args);
#else
printk(" debugging=OFF\n");
#endif
printk(" setup_args=");
for (i = 0; i < MAX_SETUP_ARGS; i++)
printk("%s,", setup_args[i]);
printk("\n");
printk(" Version %s - %s, Compiled %s at %s\n",
WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
}
int
wd33c93_proc_info(struct Scsi_Host *instance, char *buf, char **start, off_t off, int len, int in)
{
#ifdef PROC_INTERFACE
char *bp;
char tbuf[128];
struct WD33C93_hostdata *hd;
struct scsi_cmnd *cmd;
int x;
static int stop = 0;
hd = (struct WD33C93_hostdata *) instance->hostdata;
/* If 'in' is TRUE we need to _read_ the proc file. We accept the following
* keywords (same format as command-line, but arguments are not optional):
* debug
* disconnect
* period
* resync
* proc
* nodma
* level2
* burst
* fast
* nosync
*/
if (in) {
buf[len] = '\0';
for (bp = buf; *bp; ) {
while (',' == *bp || ' ' == *bp)
++bp;
if (!strncmp(bp, "debug:", 6)) {
hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;
} else if (!strncmp(bp, "disconnect:", 11)) {
x = simple_strtoul(bp+11, &bp, 0);
if (x < DIS_NEVER || x > DIS_ALWAYS)
x = DIS_ADAPTIVE;
hd->disconnect = x;
} else if (!strncmp(bp, "period:", 7)) {
x = simple_strtoul(bp+7, &bp, 0);
hd->default_sx_per =
hd->sx_table[round_period((unsigned int) x,
hd->sx_table)].period_ns;
} else if (!strncmp(bp, "resync:", 7)) {
set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));
} else if (!strncmp(bp, "proc:", 5)) {
hd->proc = simple_strtoul(bp+5, &bp, 0);
} else if (!strncmp(bp, "nodma:", 6)) {
hd->no_dma = simple_strtoul(bp+6, &bp, 0);
} else if (!strncmp(bp, "level2:", 7)) {
hd->level2 = simple_strtoul(bp+7, &bp, 0);
} else if (!strncmp(bp, "burst:", 6)) {
hd->dma_mode =
simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;
} else if (!strncmp(bp, "fast:", 5)) {
x = !!simple_strtol(bp+5, &bp, 0);
if (x != hd->fast)
set_resync(hd, 0xff);
hd->fast = x;
} else if (!strncmp(bp, "nosync:", 7)) {
x = simple_strtoul(bp+7, &bp, 0);
set_resync(hd, x ^ hd->no_sync);
hd->no_sync = x;
} else {
break; /* unknown keyword,syntax-error,... */
}
}
return len;
}
spin_lock_irq(&hd->lock);
bp = buf;
*bp = '\0';
if (hd->proc & PR_VERSION) {
sprintf(tbuf, "\nVersion %s - %s. Compiled %s %s",
WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
strcat(bp, tbuf);
}
if (hd->proc & PR_INFO) {
sprintf(tbuf, "\nclock_freq=%02x no_sync=%02x no_dma=%d"
" dma_mode=%02x fast=%d",
hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);
strcat(bp, tbuf);
strcat(bp, "\nsync_xfer[] = ");
for (x = 0; x < 7; x++) {
sprintf(tbuf, "\t%02x", hd->sync_xfer[x]);
strcat(bp, tbuf);
}
strcat(bp, "\nsync_stat[] = ");
for (x = 0; x < 7; x++) {
sprintf(tbuf, "\t%02x", hd->sync_stat[x]);
strcat(bp, tbuf);
}
}
#ifdef PROC_STATISTICS
if (hd->proc & PR_STATISTICS) {
strcat(bp, "\ncommands issued: ");
for (x = 0; x < 7; x++) {
sprintf(tbuf, "\t%ld", hd->cmd_cnt[x]);
strcat(bp, tbuf);
}
strcat(bp, "\ndisconnects allowed:");
for (x = 0; x < 7; x++) {
sprintf(tbuf, "\t%ld", hd->disc_allowed_cnt[x]);
strcat(bp, tbuf);
}
strcat(bp, "\ndisconnects done: ");
for (x = 0; x < 7; x++) {
sprintf(tbuf, "\t%ld", hd->disc_done_cnt[x]);
strcat(bp, tbuf);
}
sprintf(tbuf,
"\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
strcat(bp, tbuf);
}
#endif
if (hd->proc & PR_CONNECTED) {
strcat(bp, "\nconnected: ");
if (hd->connected) {
cmd = (struct scsi_cmnd *) hd->connected;
sprintf(tbuf, " %ld-%d:%d(%02x)",
cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
strcat(bp, tbuf);
}
}
if (hd->proc & PR_INPUTQ) {
strcat(bp, "\ninput_Q: ");
cmd = (struct scsi_cmnd *) hd->input_Q;
while (cmd) {
sprintf(tbuf, " %ld-%d:%d(%02x)",
cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
strcat(bp, tbuf);
cmd = (struct scsi_cmnd *) cmd->host_scribble;
}
}
if (hd->proc & PR_DISCQ) {
strcat(bp, "\ndisconnected_Q:");
cmd = (struct scsi_cmnd *) hd->disconnected_Q;
while (cmd) {
sprintf(tbuf, " %ld-%d:%d(%02x)",
cmd->serial_number, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
strcat(bp, tbuf);
cmd = (struct scsi_cmnd *) cmd->host_scribble;
}
}
strcat(bp, "\n");
spin_unlock_irq(&hd->lock);
*start = buf;
if (stop) {
stop = 0;
return 0;
}
if (off > 0x40000) /* ALWAYS stop after 256k bytes have been read */
stop = 1;
if (hd->proc & PR_STOP) /* stop every other time */
stop = 1;
return strlen(bp);
#else /* PROC_INTERFACE */
return 0;
#endif /* PROC_INTERFACE */
}
EXPORT_SYMBOL(wd33c93_host_reset);
EXPORT_SYMBOL(wd33c93_init);
EXPORT_SYMBOL(wd33c93_abort);
EXPORT_SYMBOL(wd33c93_queuecommand);
EXPORT_SYMBOL(wd33c93_intr);
EXPORT_SYMBOL(wd33c93_proc_info);
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