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gerrit-public.fairphone.software / kernel / msm / 3fe0c2776113c24b4b30374003f934cf44280db5 / . / drivers / scsi / wd33c93.c
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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
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <asm/irq.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include "wd33c93.h"
#define WD33C93_VERSION "1.26"
#define WD33C93_DATE "22/Feb/2003"
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.
* - 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 struct sx_period sx_table[] = {
{1, 0x20},
{252, 0x20},
{376, 0x30},
{500, 0x40},
{624, 0x50},
{752, 0x60},
{876, 0x70},
{1000, 0x00},
{0, 0}
};
static int
round_period(unsigned int period)
{
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;
}
static uchar
calc_sync_xfer(unsigned int period, unsigned int offset)
{
uchar result;
period *= 4; /* convert SDTR code to ns */
result = sx_table[round_period(period)].reg_value;
result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF;
return result;
}
int
wd33c93_queuecommand(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->pid))
/* 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 (cmd->use_sg) {
cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
cmd->SCp.buffers_residual = cmd->use_sg - 1;
cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) +
cmd->SCp.buffer->offset;
cmd->SCp.this_residual = cmd->SCp.buffer->length;
} else {
cmd->SCp.buffer = NULL;
cmd->SCp.buffers_residual = 0;
cmd->SCp.ptr = (char *) cmd->request_buffer;
cmd->SCp.this_residual = cmd->request_bufflen;
}
/* 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->pid))
spin_unlock_irq(&hostdata->lock);
return 0;
}
/*
* 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 = 0;
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 | CTRL_DMA);
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->pid))
}
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 = page_address(cmd->SCp.buffer->page) +
cmd->SCp.buffer->offset;
}
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 | CTRL_DMA);
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) {
#ifdef SYNC_DEBUG
printk(" sending SDTR ");
#endif
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)) {
hostdata->outgoing_msg[4] =
hostdata->default_sx_per / 4;
hostdata->outgoing_msg[5] = 0;
} else {
hostdata->outgoing_msg[4] = OPTIMUM_SX_PER / 4;
hostdata->outgoing_msg[5] = OPTIMUM_SX_OFF;
}
hostdata->outgoing_len = 6;
} 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->pid))
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 */
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 */
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->pid))
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;
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:
id = calc_sync_xfer(ucp[3], ucp[4]);
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;
hostdata->outgoing_msg[3] =
hostdata->default_sx_per /
4;
hostdata->outgoing_msg[4] = 0;
hostdata->outgoing_len = 5;
hostdata->sync_xfer[cmd->device->id] =
calc_sync_xfer(hostdata->
default_sx_per
/ 4, 0);
} else {
hostdata->sync_xfer[cmd->device->id] = id;
}
#ifdef SYNC_DEBUG
printk("sync_xfer=%02x",
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->pid))
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->pid);
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->pid))
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->pid))
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);
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);
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->pid))
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));
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;
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);
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 = 0;
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->pid);
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->pid);
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->pid);
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 ((int)(sizeof(setup_args) / sizeof(char *)))
#define SETUP_BUFFER_SIZE 200
static char setup_buffer[SETUP_BUFFER_SIZE];
static char setup_used[MAX_SETUP_ARGS];
static int done_setup = 0;
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;
}
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 = clock_freq;
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);
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_sync = 0xff; /* sync defaults to off */
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("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 =
sx_table[round_period((unsigned int) val)].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("clock", &flags, &val, buf)) {
if (val > 7 && val < 11)
val = WD33C93_FS_8_10;
else if (val > 11 && val < 16)
val = WD33C93_FS_12_15;
else if (val > 15 && val < 21)
val = WD33C93_FS_16_20;
else
val = WD33C93_FS_8_10;
hostdata->clock_freq = 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, i;
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 only ONE per read):
* debug
* disconnect
* period
* resync
* proc
* nodma
*/
if (in) {
buf[len] = '\0';
bp = buf;
if (!strncmp(bp, "debug:", 6)) {
bp += 6;
hd->args = simple_strtoul(bp, NULL, 0) & DB_MASK;
} else if (!strncmp(bp, "disconnect:", 11)) {
bp += 11;
x = simple_strtoul(bp, NULL, 0);
if (x < DIS_NEVER || x > DIS_ALWAYS)
x = DIS_ADAPTIVE;
hd->disconnect = x;
} else if (!strncmp(bp, "period:", 7)) {
bp += 7;
x = simple_strtoul(bp, NULL, 0);
hd->default_sx_per =
sx_table[round_period((unsigned int) x)].period_ns;
} else if (!strncmp(bp, "resync:", 7)) {
bp += 7;
x = simple_strtoul(bp, NULL, 0);
for (i = 0; i < 7; i++)
if (x & (1 << i))
hd->sync_stat[i] = SS_UNSET;
} else if (!strncmp(bp, "proc:", 5)) {
bp += 5;
hd->proc = simple_strtoul(bp, NULL, 0);
} else if (!strncmp(bp, "nodma:", 6)) {
bp += 6;
hd->no_dma = simple_strtoul(bp, NULL, 0);
} else if (!strncmp(bp, "level2:", 7)) {
bp += 7;
hd->level2 = simple_strtoul(bp, NULL, 0);
}
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",
hd->clock_freq, hd->no_sync, hd->no_dma);
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->pid, 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->pid, 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->pid, 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 */
}
void
wd33c93_release(void)
{
}
EXPORT_SYMBOL(wd33c93_host_reset);
EXPORT_SYMBOL(wd33c93_init);
EXPORT_SYMBOL(wd33c93_release);
EXPORT_SYMBOL(wd33c93_abort);
EXPORT_SYMBOL(wd33c93_queuecommand);
EXPORT_SYMBOL(wd33c93_intr);
EXPORT_SYMBOL(wd33c93_proc_info);