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linux-next/drivers/scsi/arm/fas216.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

3046 lines
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/*
* linux/drivers/acorn/scsi/fas216.c
*
* Copyright (C) 1997-2003 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
* other sources, including:
* the AMD Am53CF94 data sheet
* the AMD Am53C94 data sheet
*
* This is a generic driver. To use it, have a look at cumana_2.c. You
* should define your own structure that overlays FAS216_Info, eg:
* struct my_host_data {
* FAS216_Info info;
* ... my host specific data ...
* };
*
* Changelog:
* 30-08-1997 RMK Created
* 14-09-1997 RMK Started disconnect support
* 08-02-1998 RMK Corrected real DMA support
* 15-02-1998 RMK Started sync xfer support
* 06-04-1998 RMK Tightened conditions for printing incomplete
* transfers
* 02-05-1998 RMK Added extra checks in fas216_reset
* 24-05-1998 RMK Fixed synchronous transfers with period >= 200ns
* 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
* 26-08-1998 RMK Improved message support wrt MESSAGE_REJECT
* 02-04-2000 RMK Converted to use the new error handling, and
* automatically request sense data upon check
* condition status from targets.
*/
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/ecard.h>
#include "../scsi.h"
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_host.h>
#include "fas216.h"
#include "scsi.h"
/* NOTE: SCSI2 Synchronous transfers *require* DMA according to
* the data sheet. This restriction is crazy, especially when
* you only want to send 16 bytes! What were the guys who
* designed this chip on at that time? Did they read the SCSI2
* spec at all? The following sections are taken from the SCSI2
* standard (s2r10) concerning this:
*
* > IMPLEMENTORS NOTES:
* > (1) Re-negotiation at every selection is not recommended, since a
* > significant performance impact is likely.
*
* > The implied synchronous agreement shall remain in effect until a BUS DEVICE
* > RESET message is received, until a hard reset condition occurs, or until one
* > of the two SCSI devices elects to modify the agreement. The default data
* > transfer mode is asynchronous data transfer mode. The default data transfer
* > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
* > reset condition.
*
* In total, this means that once you have elected to use synchronous
* transfers, you must always use DMA.
*
* I was thinking that this was a good chip until I found this restriction ;(
*/
#define SCSI2_SYNC
#undef SCSI2_TAG
#undef DEBUG_CONNECT
#undef DEBUG_MESSAGES
#undef CHECK_STRUCTURE
#define LOG_CONNECT (1 << 0)
#define LOG_BUSSERVICE (1 << 1)
#define LOG_FUNCTIONDONE (1 << 2)
#define LOG_MESSAGES (1 << 3)
#define LOG_BUFFER (1 << 4)
#define LOG_ERROR (1 << 8)
static int level_mask = LOG_ERROR;
module_param(level_mask, int, 0644);
static int __init fas216_log_setup(char *str)
{
char *s;
level_mask = 0;
while ((s = strsep(&str, ",")) != NULL) {
switch (s[0]) {
case 'a':
if (strcmp(s, "all") == 0)
level_mask |= -1;
break;
case 'b':
if (strncmp(s, "bus", 3) == 0)
level_mask |= LOG_BUSSERVICE;
if (strncmp(s, "buf", 3) == 0)
level_mask |= LOG_BUFFER;
break;
case 'c':
level_mask |= LOG_CONNECT;
break;
case 'e':
level_mask |= LOG_ERROR;
break;
case 'm':
level_mask |= LOG_MESSAGES;
break;
case 'n':
if (strcmp(s, "none") == 0)
level_mask = 0;
break;
case 's':
level_mask |= LOG_FUNCTIONDONE;
break;
}
}
return 1;
}
__setup("fas216_logging=", fas216_log_setup);
static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
{
unsigned int off = reg << info->scsi.io_shift;
return readb(info->scsi.io_base + off);
}
static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
{
unsigned int off = reg << info->scsi.io_shift;
writeb(val, info->scsi.io_base + off);
}
static void fas216_dumpstate(FAS216_Info *info)
{
unsigned char is, stat, inst;
is = fas216_readb(info, REG_IS);
stat = fas216_readb(info, REG_STAT);
inst = fas216_readb(info, REG_INST);
printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
" INST=%02X IS=%02X CFIS=%02X",
fas216_readb(info, REG_CTCL),
fas216_readb(info, REG_CTCM),
fas216_readb(info, REG_CMD), stat, inst, is,
fas216_readb(info, REG_CFIS));
printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
fas216_readb(info, REG_CNTL1),
fas216_readb(info, REG_CNTL2),
fas216_readb(info, REG_CNTL3),
fas216_readb(info, REG_CTCH));
}
static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
{
printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
SCp->buffers_residual, suffix);
}
static void fas216_dumpinfo(FAS216_Info *info)
{
static int used = 0;
int i;
if (used++)
return;
printk("FAS216_Info=\n");
printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
info->magic_start, info->host, info->SCpnt,
info->origSCpnt);
printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
info->scsi.io_shift, info->scsi.irq,
info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
info->scsi.cfg[3]);
printk(" type=%p phase=%X\n",
info->scsi.type, info->scsi.phase);
print_SCp(&info->scsi.SCp, " SCp={ ", " }\n");
printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n",
info->scsi.async_stp,
info->scsi.disconnectable, info->scsi.aborting);
printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
" disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
info->stats.queues, info->stats.removes, info->stats.fins,
info->stats.reads, info->stats.writes, info->stats.miscs,
info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
info->stats.host_resets);
printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
info->ifcfg.clockrate, info->ifcfg.select_timeout,
info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
for (i = 0; i < 8; i++) {
printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
i, info->busyluns[i], i,
info->device[i].disconnect_ok, info->device[i].stp,
info->device[i].sof, info->device[i].sync_state);
}
printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
info->dma.transfer_type, info->dma.setup,
info->dma.pseudo, info->dma.stop);
printk(" internal_done=%X magic_end=%lX }\n",
info->internal_done, info->magic_end);
}
#ifdef CHECK_STRUCTURE
static void __fas216_checkmagic(FAS216_Info *info, const char *func)
{
int corruption = 0;
if (info->magic_start != MAGIC) {
printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
corruption++;
}
if (info->magic_end != MAGIC) {
printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
corruption++;
}
if (corruption) {
fas216_dumpinfo(info);
panic("scsi memory space corrupted in %s", func);
}
}
#define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
#else
#define fas216_checkmagic(info)
#endif
static const char *fas216_bus_phase(int stat)
{
static const char *phases[] = {
"DATA OUT", "DATA IN",
"COMMAND", "STATUS",
"MISC OUT", "MISC IN",
"MESG OUT", "MESG IN"
};
return phases[stat & STAT_BUSMASK];
}
static const char *fas216_drv_phase(FAS216_Info *info)
{
static const char *phases[] = {
[PHASE_IDLE] = "idle",
[PHASE_SELECTION] = "selection",
[PHASE_COMMAND] = "command",
[PHASE_DATAOUT] = "data out",
[PHASE_DATAIN] = "data in",
[PHASE_MSGIN] = "message in",
[PHASE_MSGIN_DISCONNECT]= "disconnect",
[PHASE_MSGOUT_EXPECT] = "expect message out",
[PHASE_MSGOUT] = "message out",
[PHASE_STATUS] = "status",
[PHASE_DONE] = "done",
};
if (info->scsi.phase < ARRAY_SIZE(phases) &&
phases[info->scsi.phase])
return phases[info->scsi.phase];
return "???";
}
static char fas216_target(FAS216_Info *info)
{
if (info->SCpnt)
return '0' + info->SCpnt->device->id;
else
return 'H';
}
static void
fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
{
static char buf[1024];
vsnprintf(buf, sizeof(buf), fmt, ap);
printk("scsi%d.%c: %s", info->host->host_no, target, buf);
}
static void fas216_log_command(FAS216_Info *info, int level,
struct scsi_cmnd *SCpnt, char *fmt, ...)
{
va_list args;
if (level != 0 && !(level & level_mask))
return;
va_start(args, fmt);
fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
va_end(args);
printk(" CDB: ");
__scsi_print_command(SCpnt->cmnd);
}
static void
fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
{
va_list args;
if (level != 0 && !(level & level_mask))
return;
if (target < 0)
target = 'H';
else
target += '0';
va_start(args, fmt);
fas216_do_log(info, target, fmt, args);
va_end(args);
printk("\n");
}
static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
{
va_list args;
if (level != 0 && !(level & level_mask))
return;
va_start(args, fmt);
fas216_do_log(info, fas216_target(info), fmt, args);
va_end(args);
printk("\n");
}
#define PH_SIZE 32
static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
static int ph_ptr;
static void add_debug_list(int stat, int ssr, int isr, int ph)
{
ph_list[ph_ptr].stat = stat;
ph_list[ph_ptr].ssr = ssr;
ph_list[ph_ptr].isr = isr;
ph_list[ph_ptr].ph = ph;
ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
}
static struct { int command; void *from; } cmd_list[8];
static int cmd_ptr;
static void fas216_cmd(FAS216_Info *info, unsigned int command)
{
cmd_list[cmd_ptr].command = command;
cmd_list[cmd_ptr].from = __builtin_return_address(0);
cmd_ptr = (cmd_ptr + 1) & 7;
fas216_writeb(info, REG_CMD, command);
}
static void print_debug_list(void)
{
int i;
i = ph_ptr;
printk(KERN_ERR "SCSI IRQ trail\n");
do {
printk(" %02x:%02x:%02x:%1x",
ph_list[i].stat, ph_list[i].ssr,
ph_list[i].isr, ph_list[i].ph);
i = (i + 1) & (PH_SIZE - 1);
if (((i ^ ph_ptr) & 7) == 0)
printk("\n");
} while (i != ph_ptr);
if ((i ^ ph_ptr) & 7)
printk("\n");
i = cmd_ptr;
printk(KERN_ERR "FAS216 commands: ");
do {
printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
i = (i + 1) & 7;
} while (i != cmd_ptr);
printk("\n");
}
static void fas216_done(FAS216_Info *info, unsigned int result);
/**
* fas216_get_last_msg - retrive last message from the list
* @info: interface to search
* @pos: current fifo position
*
* Retrieve a last message from the list, using position in fifo.
*/
static inline unsigned short
fas216_get_last_msg(FAS216_Info *info, int pos)
{
unsigned short packed_msg = NOP;
struct message *msg;
int msgnr = 0;
while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
if (pos >= msg->fifo)
break;
}
if (msg) {
if (msg->msg[0] == EXTENDED_MESSAGE)
packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
else
packed_msg = msg->msg[0];
}
fas216_log(info, LOG_MESSAGES,
"Message: %04x found at position %02x\n", packed_msg, pos);
return packed_msg;
}
/**
* fas216_syncperiod - calculate STP register value
* @info: state structure for interface connected to device
* @ns: period in ns (between subsequent bytes)
*
* Calculate value to be loaded into the STP register for a given period
* in ns. Returns a value suitable for REG_STP.
*/
static int fas216_syncperiod(FAS216_Info *info, int ns)
{
int value = (info->ifcfg.clockrate * ns) / 1000;
fas216_checkmagic(info);
if (value < 4)
value = 4;
else if (value > 35)
value = 35;
return value & 31;
}
/**
* fas216_set_sync - setup FAS216 chip for specified transfer period.
* @info: state structure for interface connected to device
* @target: target
*
* Correctly setup FAS216 chip for specified transfer period.
* Notes : we need to switch the chip out of FASTSCSI mode if we have
* a transfer period >= 200ns - otherwise the chip will violate
* the SCSI timings.
*/
static void fas216_set_sync(FAS216_Info *info, int target)
{
unsigned int cntl3;
fas216_writeb(info, REG_SOF, info->device[target].sof);
fas216_writeb(info, REG_STP, info->device[target].stp);
cntl3 = info->scsi.cfg[2];
if (info->device[target].period >= (200 / 4))
cntl3 = cntl3 & ~CNTL3_FASTSCSI;
fas216_writeb(info, REG_CNTL3, cntl3);
}
/* Synchronous transfer support
*
* Note: The SCSI II r10 spec says (5.6.12):
*
* (2) Due to historical problems with early host adapters that could
* not accept an SDTR message, some targets may not initiate synchronous
* negotiation after a power cycle as required by this standard. Host
* adapters that support synchronous mode may avoid the ensuing failure
* modes when the target is independently power cycled by initiating a
* synchronous negotiation on each REQUEST SENSE and INQUIRY command.
* This approach increases the SCSI bus overhead and is not recommended
* for new implementations. The correct method is to respond to an
* SDTR message with a MESSAGE REJECT message if the either the
* initiator or target devices does not support synchronous transfers
* or does not want to negotiate for synchronous transfers at the time.
* Using the correct method assures compatibility with wide data
* transfers and future enhancements.
*
* We will always initiate a synchronous transfer negotiation request on
* every INQUIRY or REQUEST SENSE message, unless the target itself has
* at some point performed a synchronous transfer negotiation request, or
* we have synchronous transfers disabled for this device.
*/
/**
* fas216_handlesync - Handle a synchronous transfer message
* @info: state structure for interface
* @msg: message from target
*
* Handle a synchronous transfer message from the target
*/
static void fas216_handlesync(FAS216_Info *info, char *msg)
{
struct fas216_device *dev = &info->device[info->SCpnt->device->id];
enum { sync, async, none, reject } res = none;
#ifdef SCSI2_SYNC
switch (msg[0]) {
case MESSAGE_REJECT:
/* Synchronous transfer request failed.
* Note: SCSI II r10:
*
* SCSI devices that are capable of synchronous
* data transfers shall not respond to an SDTR
* message with a MESSAGE REJECT message.
*
* Hence, if we get this condition, we disable
* negotiation for this device.
*/
if (dev->sync_state == neg_inprogress) {
dev->sync_state = neg_invalid;
res = async;
}
break;
case EXTENDED_MESSAGE:
switch (dev->sync_state) {
/* We don't accept synchronous transfer requests.
* Respond with a MESSAGE_REJECT to prevent a
* synchronous transfer agreement from being reached.
*/
case neg_invalid:
res = reject;
break;
/* We were not negotiating a synchronous transfer,
* but the device sent us a negotiation request.
* Honour the request by sending back a SDTR
* message containing our capability, limited by
* the targets capability.
*/
default:
fas216_cmd(info, CMD_SETATN);
if (msg[4] > info->ifcfg.sync_max_depth)
msg[4] = info->ifcfg.sync_max_depth;
if (msg[3] < 1000 / info->ifcfg.clockrate)
msg[3] = 1000 / info->ifcfg.clockrate;
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 5,
EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
msg[3], msg[4]);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
/* This is wrong. The agreement is not in effect
* until this message is accepted by the device
*/
dev->sync_state = neg_targcomplete;
res = sync;
break;
/* We initiated the synchronous transfer negotiation,
* and have successfully received a response from the
* target. The synchronous transfer agreement has been
* reached. Note: if the values returned are out of our
* bounds, we must reject the message.
*/
case neg_inprogress:
res = reject;
if (msg[4] <= info->ifcfg.sync_max_depth &&
msg[3] >= 1000 / info->ifcfg.clockrate) {
dev->sync_state = neg_complete;
res = sync;
}
break;
}
}
#else
res = reject;
#endif
switch (res) {
case sync:
dev->period = msg[3];
dev->sof = msg[4];
dev->stp = fas216_syncperiod(info, msg[3] * 4);
fas216_set_sync(info, info->SCpnt->device->id);
break;
case reject:
fas216_cmd(info, CMD_SETATN);
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
case async:
dev->period = info->ifcfg.asyncperiod / 4;
dev->sof = 0;
dev->stp = info->scsi.async_stp;
fas216_set_sync(info, info->SCpnt->device->id);
break;
case none:
break;
}
}
/**
* fas216_updateptrs - update data pointers after transfer suspended/paused
* @info: interface's local pointer to update
* @bytes_transferred: number of bytes transferred
*
* Update data pointers after transfer suspended/paused
*/
static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
{
struct scsi_pointer *SCp = &info->scsi.SCp;
fas216_checkmagic(info);
BUG_ON(bytes_transferred < 0);
SCp->phase -= bytes_transferred;
while (bytes_transferred != 0) {
if (SCp->this_residual > bytes_transferred)
break;
/*
* We have used up this buffer. Move on to the
* next buffer.
*/
bytes_transferred -= SCp->this_residual;
if (!next_SCp(SCp) && bytes_transferred) {
printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
info->host->host_no, '0' + info->SCpnt->device->id);
return;
}
}
SCp->this_residual -= bytes_transferred;
if (SCp->this_residual)
SCp->ptr += bytes_transferred;
else
SCp->ptr = NULL;
}
/**
* fas216_pio - transfer data off of/on to card using programmed IO
* @info: interface to transfer data to/from
* @direction: direction to transfer data (DMA_OUT/DMA_IN)
*
* Transfer data off of/on to card using programmed IO.
* Notes: this is incredibly slow.
*/
static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
{
struct scsi_pointer *SCp = &info->scsi.SCp;
fas216_checkmagic(info);
if (direction == DMA_OUT)
fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
else
put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
if (SCp->this_residual == 0)
next_SCp(SCp);
}
static void fas216_set_stc(FAS216_Info *info, unsigned int length)
{
fas216_writeb(info, REG_STCL, length);
fas216_writeb(info, REG_STCM, length >> 8);
fas216_writeb(info, REG_STCH, length >> 16);
}
static unsigned int fas216_get_ctc(FAS216_Info *info)
{
return fas216_readb(info, REG_CTCL) +
(fas216_readb(info, REG_CTCM) << 8) +
(fas216_readb(info, REG_CTCH) << 16);
}
/**
* fas216_cleanuptransfer - clean up after a transfer has completed.
* @info: interface to clean up
*
* Update the data pointers according to the number of bytes transferred
* on the SCSI bus.
*/
static void fas216_cleanuptransfer(FAS216_Info *info)
{
unsigned long total, residual, fifo;
fasdmatype_t dmatype = info->dma.transfer_type;
info->dma.transfer_type = fasdma_none;
/*
* PIO transfers do not need to be cleaned up.
*/
if (dmatype == fasdma_pio || dmatype == fasdma_none)
return;
if (dmatype == fasdma_real_all)
total = info->scsi.SCp.phase;
else
total = info->scsi.SCp.this_residual;
residual = fas216_get_ctc(info);
fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
fas216_log(info, LOG_BUFFER, "cleaning up from previous "
"transfer: length 0x%06x, residual 0x%x, fifo %d",
total, residual, fifo);
/*
* If we were performing Data-Out, the transfer counter
* counts down each time a byte is transferred by the
* host to the FIFO. This means we must include the
* bytes left in the FIFO from the transfer counter.
*/
if (info->scsi.phase == PHASE_DATAOUT)
residual += fifo;
fas216_updateptrs(info, total - residual);
}
/**
* fas216_transfer - Perform a DMA/PIO transfer off of/on to card
* @info: interface from which device disconnected from
*
* Start a DMA/PIO transfer off of/on to card
*/
static void fas216_transfer(FAS216_Info *info)
{
fasdmadir_t direction;
fasdmatype_t dmatype;
fas216_log(info, LOG_BUFFER,
"starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
info->scsi.SCp.phase);
if (!info->scsi.SCp.ptr) {
fas216_log(info, LOG_ERROR, "null buffer passed to "
"fas216_starttransfer");
print_SCp(&info->scsi.SCp, "SCp: ", "\n");
print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
return;
}
/*
* If we have a synchronous transfer agreement in effect, we must
* use DMA mode. If we are using asynchronous transfers, we may
* use DMA mode or PIO mode.
*/
if (info->device[info->SCpnt->device->id].sof)
dmatype = fasdma_real_all;
else
dmatype = fasdma_pio;
if (info->scsi.phase == PHASE_DATAOUT)
direction = DMA_OUT;
else
direction = DMA_IN;
if (info->dma.setup)
dmatype = info->dma.setup(info->host, &info->scsi.SCp,
direction, dmatype);
info->dma.transfer_type = dmatype;
if (dmatype == fasdma_real_all)
fas216_set_stc(info, info->scsi.SCp.phase);
else
fas216_set_stc(info, info->scsi.SCp.this_residual);
switch (dmatype) {
case fasdma_pio:
fas216_log(info, LOG_BUFFER, "PIO transfer");
fas216_writeb(info, REG_SOF, 0);
fas216_writeb(info, REG_STP, info->scsi.async_stp);
fas216_cmd(info, CMD_TRANSFERINFO);
fas216_pio(info, direction);
break;
case fasdma_pseudo:
fas216_log(info, LOG_BUFFER, "pseudo transfer");
fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
info->dma.pseudo(info->host, &info->scsi.SCp,
direction, info->SCpnt->transfersize);
break;
case fasdma_real_block:
fas216_log(info, LOG_BUFFER, "block dma transfer");
fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
break;
case fasdma_real_all:
fas216_log(info, LOG_BUFFER, "total dma transfer");
fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
break;
default:
fas216_log(info, LOG_BUFFER | LOG_ERROR,
"invalid FAS216 DMA type");
break;
}
}
/**
* fas216_stoptransfer - Stop a DMA transfer onto / off of the card
* @info: interface from which device disconnected from
*
* Called when we switch away from DATA IN or DATA OUT phases.
*/
static void fas216_stoptransfer(FAS216_Info *info)
{
fas216_checkmagic(info);
if (info->dma.transfer_type == fasdma_real_all ||
info->dma.transfer_type == fasdma_real_block)
info->dma.stop(info->host, &info->scsi.SCp);
fas216_cleanuptransfer(info);
if (info->scsi.phase == PHASE_DATAIN) {
unsigned int fifo;
/*
* If we were performing Data-In, then the FIFO counter
* contains the number of bytes not transferred via DMA
* from the on-board FIFO. Read them manually.
*/
fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
while (fifo && info->scsi.SCp.ptr) {
*info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
fas216_updateptrs(info, 1);
fifo--;
}
} else {
/*
* After a Data-Out phase, there may be unsent
* bytes left in the FIFO. Flush them out.
*/
fas216_cmd(info, CMD_FLUSHFIFO);
}
}
static void fas216_aborttransfer(FAS216_Info *info)
{
fas216_checkmagic(info);
if (info->dma.transfer_type == fasdma_real_all ||
info->dma.transfer_type == fasdma_real_block)
info->dma.stop(info->host, &info->scsi.SCp);
info->dma.transfer_type = fasdma_none;
fas216_cmd(info, CMD_FLUSHFIFO);
}
static void fas216_kick(FAS216_Info *info);
/**
* fas216_disconnected_intr - handle device disconnection
* @info: interface from which device disconnected from
*
* Handle device disconnection
*/
static void fas216_disconnect_intr(FAS216_Info *info)
{
unsigned long flags;
fas216_checkmagic(info);
fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
info->scsi.phase);
msgqueue_flush(&info->scsi.msgs);
switch (info->scsi.phase) {
case PHASE_SELECTION: /* while selecting - no target */
case PHASE_SELSTEPS:
fas216_done(info, DID_NO_CONNECT);
break;
case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */
info->scsi.disconnectable = 1;
info->scsi.phase = PHASE_IDLE;
info->stats.disconnects += 1;
spin_lock_irqsave(&info->host_lock, flags);
if (info->scsi.phase == PHASE_IDLE)
fas216_kick(info);
spin_unlock_irqrestore(&info->host_lock, flags);
break;
case PHASE_DONE: /* at end of command - complete */
fas216_done(info, DID_OK);
break;
case PHASE_MSGOUT: /* message out - possible ABORT message */
if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
info->scsi.aborting = 0;
fas216_done(info, DID_ABORT);
break;
}
default: /* huh? */
printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
info->host->host_no, fas216_target(info), fas216_drv_phase(info));
print_debug_list();
fas216_stoptransfer(info);
fas216_done(info, DID_ERROR);
break;
}
}
/**
* fas216_reselected_intr - start reconnection of a device
* @info: interface which was reselected
*
* Start reconnection of a device
*/
static void
fas216_reselected_intr(FAS216_Info *info)
{
unsigned int cfis, i;
unsigned char msg[4];
unsigned char target, lun, tag;
fas216_checkmagic(info);
WARN_ON(info->scsi.phase == PHASE_SELECTION ||
info->scsi.phase == PHASE_SELSTEPS);
cfis = fas216_readb(info, REG_CFIS);
fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
info->scsi.phase, cfis);
cfis &= CFIS_CF;
if (cfis < 2 || cfis > 4) {
printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
info->host->host_no);
goto bad_message;
}
for (i = 0; i < cfis; i++)
msg[i] = fas216_readb(info, REG_FF);
if (!(msg[0] & (1 << info->host->this_id)) ||
!(msg[1] & 0x80))
goto initiator_error;
target = msg[0] & ~(1 << info->host->this_id);
target = ffs(target) - 1;
lun = msg[1] & 7;
tag = 0;
if (cfis >= 3) {
if (msg[2] != SIMPLE_QUEUE_TAG)
goto initiator_error;
tag = msg[3];
}
/* set up for synchronous transfers */
fas216_writeb(info, REG_SDID, target);
fas216_set_sync(info, target);
msgqueue_flush(&info->scsi.msgs);
fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
target, lun, tag);
if (info->scsi.disconnectable && info->SCpnt) {
info->scsi.disconnectable = 0;
if (info->SCpnt->device->id == target &&
info->SCpnt->device->lun == lun &&
info->SCpnt->tag == tag) {
fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
} else {
queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
info->SCpnt = NULL;
}
}
if (!info->SCpnt) {
info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
target, lun, tag);
fas216_log(info, LOG_CONNECT, "had to get command");
}
if (info->SCpnt) {
/*
* Restore data pointer from SAVED data pointer
*/
info->scsi.SCp = info->SCpnt->SCp;
fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
info->scsi.phase = PHASE_MSGIN;
} else {
/*
* Our command structure not found - abort the
* command on the target. Since we have no
* record of this command, we can't send
* an INITIATOR DETECTED ERROR message.
*/
fas216_cmd(info, CMD_SETATN);
#if 0
if (tag)
msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
else
#endif
msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
info->scsi.aborting = 1;
}
fas216_cmd(info, CMD_MSGACCEPTED);
return;
initiator_error:
printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
info->host->host_no);
for (i = 0; i < cfis; i++)
printk(" %02x", msg[i]);
printk("\n");
bad_message:
fas216_cmd(info, CMD_SETATN);
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
fas216_cmd(info, CMD_MSGACCEPTED);
}
static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
{
int i;
switch (message[0]) {
case COMMAND_COMPLETE:
if (msglen != 1)
goto unrecognised;
printk(KERN_ERR "scsi%d.%c: command complete with no "
"status in MESSAGE_IN?\n",
info->host->host_no, fas216_target(info));
break;
case SAVE_POINTERS:
if (msglen != 1)
goto unrecognised;
/*
* Save current data pointer to SAVED data pointer
* SCSI II standard says that we must not acknowledge
* this until we have really saved pointers.
* NOTE: we DO NOT save the command nor status pointers
* as required by the SCSI II standard. These always
* point to the start of their respective areas.
*/
info->SCpnt->SCp = info->scsi.SCp;
info->SCpnt->SCp.sent_command = 0;
fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
"save data pointers: [%p, %X]",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
break;
case RESTORE_POINTERS:
if (msglen != 1)
goto unrecognised;
/*
* Restore current data pointer from SAVED data pointer
*/
info->scsi.SCp = info->SCpnt->SCp;
fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
"restore data pointers: [%p, 0x%x]",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
break;
case DISCONNECT:
if (msglen != 1)
goto unrecognised;
info->scsi.phase = PHASE_MSGIN_DISCONNECT;
break;
case MESSAGE_REJECT:
if (msglen != 1)
goto unrecognised;
switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
fas216_handlesync(info, message);
break;
default:
fas216_log(info, 0, "reject, last message 0x%04x",
fas216_get_last_msg(info, info->scsi.msgin_fifo));
}
break;
case NOP:
break;
case EXTENDED_MESSAGE:
if (msglen < 3)
goto unrecognised;
switch (message[2]) {
case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */
fas216_handlesync(info, message);
break;
default:
goto unrecognised;
}
break;
default:
goto unrecognised;
}
return;
unrecognised:
fas216_log(info, 0, "unrecognised message, rejecting");
printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
for (i = 0; i < msglen; i++)
printk("%s%02X", i & 31 ? " " : "\n ", message[i]);
printk("\n");
/*
* Something strange seems to be happening here -
* I can't use SETATN since the chip gives me an
* invalid command interrupt when I do. Weird.
*/
fas216_cmd(info, CMD_NOP);
fas216_dumpstate(info);
fas216_cmd(info, CMD_SETATN);
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
fas216_dumpstate(info);
}
static int fas216_wait_cmd(FAS216_Info *info, int cmd)
{
int tout;
int stat;
fas216_cmd(info, cmd);
for (tout = 1000; tout; tout -= 1) {
stat = fas216_readb(info, REG_STAT);
if (stat & (STAT_INT|STAT_PARITYERROR))
break;
udelay(1);
}
return stat;
}
static int fas216_get_msg_byte(FAS216_Info *info)
{
unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
if ((stat & STAT_INT) == 0)
goto timedout;
if ((stat & STAT_BUSMASK) != STAT_MESGIN)
goto unexpected_phase_change;
fas216_readb(info, REG_INST);
stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
if ((stat & STAT_INT) == 0)
goto timedout;
if (stat & STAT_PARITYERROR)
goto parity_error;
if ((stat & STAT_BUSMASK) != STAT_MESGIN)
goto unexpected_phase_change;
fas216_readb(info, REG_INST);
return fas216_readb(info, REG_FF);
timedout:
fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
return -1;
unexpected_phase_change:
fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
return -2;
parity_error:
fas216_log(info, LOG_ERROR, "parity error during message in phase");
return -3;
}
/**
* fas216_message - handle a function done interrupt from FAS216 chip
* @info: interface which caused function done interrupt
*
* Handle a function done interrupt from FAS216 chip
*/
static void fas216_message(FAS216_Info *info)
{
unsigned char *message = info->scsi.message;
unsigned int msglen = 1;
int msgbyte = 0;
fas216_checkmagic(info);
message[0] = fas216_readb(info, REG_FF);
if (message[0] == EXTENDED_MESSAGE) {
msgbyte = fas216_get_msg_byte(info);
if (msgbyte >= 0) {
message[1] = msgbyte;
for (msglen = 2; msglen < message[1] + 2; msglen++) {
msgbyte = fas216_get_msg_byte(info);
if (msgbyte >= 0)
message[msglen] = msgbyte;
else
break;
}
}
}
if (msgbyte == -3)
goto parity_error;
#ifdef DEBUG_MESSAGES
{
int i;
printk("scsi%d.%c: message in: ",
info->host->host_no, fas216_target(info));
for (i = 0; i < msglen; i++)
printk("%02X ", message[i]);
printk("\n");
}
#endif
fas216_parse_message(info, message, msglen);
fas216_cmd(info, CMD_MSGACCEPTED);
return;
parity_error:
fas216_cmd(info, CMD_SETATN);
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
fas216_cmd(info, CMD_MSGACCEPTED);
return;
}
/**
* fas216_send_command - send command after all message bytes have been sent
* @info: interface which caused bus service
*
* Send a command to a target after all message bytes have been sent
*/
static void fas216_send_command(FAS216_Info *info)
{
int i;
fas216_checkmagic(info);
fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
fas216_cmd(info, CMD_FLUSHFIFO);
/* load command */
for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
fas216_cmd(info, CMD_TRANSFERINFO);
info->scsi.phase = PHASE_COMMAND;
}
/**
* fas216_send_messageout - handle bus service to send a message
* @info: interface which caused bus service
*
* Handle bus service to send a message.
* Note: We do not allow the device to change the data direction!
*/
static void fas216_send_messageout(FAS216_Info *info, int start)
{
unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
fas216_checkmagic(info);
fas216_cmd(info, CMD_FLUSHFIFO);
if (tot_msglen) {
struct message *msg;
int msgnr = 0;
while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
int i;
for (i = start; i < msg->length; i++)
fas216_writeb(info, REG_FF, msg->msg[i]);
msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
start = 0;
}
} else
fas216_writeb(info, REG_FF, NOP);
fas216_cmd(info, CMD_TRANSFERINFO);
info->scsi.phase = PHASE_MSGOUT;
}
/**
* fas216_busservice_intr - handle bus service interrupt from FAS216 chip
* @info: interface which caused bus service interrupt
* @stat: Status register contents
* @is: SCSI Status register contents
*
* Handle a bus service interrupt from FAS216 chip
*/
static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
{
fas216_checkmagic(info);
fas216_log(info, LOG_BUSSERVICE,
"bus service: stat=%02x is=%02x phase=%02x",
stat, is, info->scsi.phase);
switch (info->scsi.phase) {
case PHASE_SELECTION:
if ((is & IS_BITS) != IS_MSGBYTESENT)
goto bad_is;
break;
case PHASE_SELSTEPS:
switch (is & IS_BITS) {
case IS_SELARB:
case IS_MSGBYTESENT:
goto bad_is;
case IS_NOTCOMMAND:
case IS_EARLYPHASE:
if ((stat & STAT_BUSMASK) == STAT_MESGIN)
break;
goto bad_is;
case IS_COMPLETE:
break;
}
default:
break;
}
fas216_cmd(info, CMD_NOP);
#define STATE(st,ph) ((ph) << 3 | (st))
/* This table describes the legal SCSI state transitions,
* as described by the SCSI II spec.
*/
switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */
case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */
case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */
case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */
info->scsi.phase = PHASE_DATAIN;
fas216_transfer(info);
return;
case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */
case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */
fas216_cleanuptransfer(info);
fas216_transfer(info);
return;
case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */
case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */
case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */
case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */
fas216_cmd(info, CMD_FLUSHFIFO);
info->scsi.phase = PHASE_DATAOUT;
fas216_transfer(info);
return;
case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */
case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */
fas216_stoptransfer(info);
case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */
case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */
case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */
case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */
fas216_cmd(info, CMD_INITCMDCOMPLETE);
info->scsi.phase = PHASE_STATUS;
return;
case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */
case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */
fas216_stoptransfer(info);
case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */
case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */
case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */
info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
fas216_cmd(info, CMD_FLUSHFIFO);
fas216_cmd(info, CMD_TRANSFERINFO);
info->scsi.phase = PHASE_MSGIN;
return;
case STATE(STAT_MESGIN, PHASE_MSGIN):
info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
fas216_cmd(info, CMD_TRANSFERINFO);
return;
case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */
case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */
fas216_send_command(info);
info->scsi.phase = PHASE_COMMAND;
return;
/*
* Selection -> Message Out
*/
case STATE(STAT_MESGOUT, PHASE_SELECTION):
fas216_send_messageout(info, 1);
return;
/*
* Message Out -> Message Out
*/
case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
case STATE(STAT_MESGOUT, PHASE_MSGOUT):
/*
* If we get another message out phase, this usually
* means some parity error occurred. Resend complete
* set of messages. If we have more than one byte to
* send, we need to assert ATN again.
*/
if (info->device[info->SCpnt->device->id].parity_check) {
/*
* We were testing... good, the device
* supports parity checking.
*/
info->device[info->SCpnt->device->id].parity_check = 0;
info->device[info->SCpnt->device->id].parity_enabled = 1;
fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
}
if (msgqueue_msglength(&info->scsi.msgs) > 1)
fas216_cmd(info, CMD_SETATN);
/*FALLTHROUGH*/
/*
* Any -> Message Out
*/
case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
fas216_send_messageout(info, 0);
return;
/* Error recovery rules.
* These either attempt to abort or retry the operation.
* TODO: we need more of these
*/
case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */
/* error - we've sent out all the command bytes
* we have.
* NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
* to include the command bytes sent for this to work
* correctly.
*/
printk(KERN_ERR "scsi%d.%c: "
"target trying to receive more command bytes\n",
info->host->host_no, fas216_target(info));
fas216_cmd(info, CMD_SETATN);
fas216_set_stc(info, 15);
fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
return;
}
if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
info->host->host_no, fas216_target(info),
fas216_bus_phase(stat));
msgqueue_flush(&info->scsi.msgs);
fas216_cmd(info, CMD_SETATN);
msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
info->scsi.aborting = 1;
fas216_cmd(info, CMD_TRANSFERINFO);
return;
}
printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
info->host->host_no, fas216_target(info),
fas216_bus_phase(stat),
fas216_drv_phase(info));
print_debug_list();
return;
bad_is:
fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
fas216_dumpstate(info);
print_debug_list();
fas216_done(info, DID_ERROR);
}
/**
* fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
* @info: interface which caused function done interrupt
* @stat: Status register contents
* @is: SCSI Status register contents
*
* Handle a function done interrupt from FAS216 chip
*/
static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
{
unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
fas216_checkmagic(info);
fas216_log(info, LOG_FUNCTIONDONE,
"function done: stat=%02x is=%02x phase=%02x",
stat, is, info->scsi.phase);
switch (info->scsi.phase) {
case PHASE_STATUS: /* status phase - read status and msg */
if (fifo_len != 2) {
fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
}
/*
* Read status then message byte.
*/
info->scsi.SCp.Status = fas216_readb(info, REG_FF);
info->scsi.SCp.Message = fas216_readb(info, REG_FF);
info->scsi.phase = PHASE_DONE;
fas216_cmd(info, CMD_MSGACCEPTED);
break;
case PHASE_IDLE:
case PHASE_SELECTION:
case PHASE_SELSTEPS:
break;
case PHASE_MSGIN: /* message in phase */
if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
info->scsi.msgin_fifo = fifo_len;
fas216_message(info);
break;
}
default:
fas216_log(info, 0, "internal phase %s for function done?"
" What do I do with this?",
fas216_target(info), fas216_drv_phase(info));
}
}
static void fas216_bus_reset(FAS216_Info *info)
{
neg_t sync_state;
int i;
msgqueue_flush(&info->scsi.msgs);
sync_state = neg_invalid;
#ifdef SCSI2_SYNC
if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
sync_state = neg_wait;
#endif
info->scsi.phase = PHASE_IDLE;
info->SCpnt = NULL; /* bug! */
memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
for (i = 0; i < 8; i++) {
info->device[i].disconnect_ok = info->ifcfg.disconnect_ok;
info->device[i].sync_state = sync_state;
info->device[i].period = info->ifcfg.asyncperiod / 4;
info->device[i].stp = info->scsi.async_stp;
info->device[i].sof = 0;
info->device[i].wide_xfer = 0;
}
info->rst_bus_status = 1;
wake_up(&info->eh_wait);
}
/**
* fas216_intr - handle interrupts to progress a command
* @info: interface to service
*
* Handle interrupts from the interface to progress a command
*/
irqreturn_t fas216_intr(FAS216_Info *info)
{
unsigned char inst, is, stat;
int handled = IRQ_NONE;
fas216_checkmagic(info);
stat = fas216_readb(info, REG_STAT);
is = fas216_readb(info, REG_IS);
inst = fas216_readb(info, REG_INST);
add_debug_list(stat, is, inst, info->scsi.phase);
if (stat & STAT_INT) {
if (inst & INST_BUSRESET) {
fas216_log(info, 0, "bus reset detected");
fas216_bus_reset(info);
scsi_report_bus_reset(info->host, 0);
} else if (inst & INST_ILLEGALCMD) {
fas216_log(info, LOG_ERROR, "illegal command given\n");
fas216_dumpstate(info);
print_debug_list();
} else if (inst & INST_DISCONNECT)
fas216_disconnect_intr(info);
else if (inst & INST_RESELECTED) /* reselected */
fas216_reselected_intr(info);
else if (inst & INST_BUSSERVICE) /* bus service request */
fas216_busservice_intr(info, stat, is);
else if (inst & INST_FUNCDONE) /* function done */
fas216_funcdone_intr(info, stat, is);
else
fas216_log(info, 0, "unknown interrupt received:"
" phase %s inst %02X is %02X stat %02X",
fas216_drv_phase(info), inst, is, stat);
handled = IRQ_HANDLED;
}
return handled;
}
static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
{
int tot_msglen;
/* following what the ESP driver says */
fas216_set_stc(info, 0);
fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
/* flush FIFO */
fas216_cmd(info, CMD_FLUSHFIFO);
/* load bus-id and timeout */
fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
/* synchronous transfers */
fas216_set_sync(info, SCpnt->device->id);
tot_msglen = msgqueue_msglength(&info->scsi.msgs);
#ifdef DEBUG_MESSAGES
{
struct message *msg;
int msgnr = 0, i;
printk("scsi%d.%c: message out: ",
info->host->host_no, '0' + SCpnt->device->id);
while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
printk("{ ");
for (i = 0; i < msg->length; i++)
printk("%02x ", msg->msg[i]);
printk("} ");
}
printk("\n");
}
#endif
if (tot_msglen == 1 || tot_msglen == 3) {
/*
* We have an easy message length to send...
*/
struct message *msg;
int msgnr = 0, i;
info->scsi.phase = PHASE_SELSTEPS;
/* load message bytes */
while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
for (i = 0; i < msg->length; i++)
fas216_writeb(info, REG_FF, msg->msg[i]);
msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
}
/* load command */
for (i = 0; i < SCpnt->cmd_len; i++)
fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
if (tot_msglen == 1)
fas216_cmd(info, CMD_SELECTATN);
else
fas216_cmd(info, CMD_SELECTATN3);
} else {
/*
* We have an unusual number of message bytes to send.
* Load first byte into fifo, and issue SELECT with ATN and
* stop steps.
*/
struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
fas216_writeb(info, REG_FF, msg->msg[0]);
msg->fifo = 1;
fas216_cmd(info, CMD_SELECTATNSTOP);
}
}
/*
* Decide whether we need to perform a parity test on this device.
* Can also be used to force parity error conditions during initial
* information transfer phase (message out) for test purposes.
*/
static int parity_test(FAS216_Info *info, int target)
{
#if 0
if (target == 3) {
info->device[target].parity_check = 0;
return 1;
}
#endif
return info->device[target].parity_check;
}
static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
{
int disconnect_ok;
/*
* claim host busy
*/
info->scsi.phase = PHASE_SELECTION;
info->scsi.SCp = SCpnt->SCp;
info->SCpnt = SCpnt;
info->dma.transfer_type = fasdma_none;
if (parity_test(info, SCpnt->device->id))
fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
else
fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
/*
* Don't allow request sense commands to disconnect.
*/
disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
info->device[SCpnt->device->id].disconnect_ok;
/*
* build outgoing message bytes
*/
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
/*
* add tag message if required
*/
if (SCpnt->tag)
msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
do {
#ifdef SCSI2_SYNC
if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
info->device[SCpnt->device->id].sync_state == neg_complete) &&
(SCpnt->cmnd[0] == REQUEST_SENSE ||
SCpnt->cmnd[0] == INQUIRY)) {
info->device[SCpnt->device->id].sync_state = neg_inprogress;
msgqueue_addmsg(&info->scsi.msgs, 5,
EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
1000 / info->ifcfg.clockrate,
info->ifcfg.sync_max_depth);
break;
}
#endif
} while (0);
__fas216_start_command(info, SCpnt);
}
static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
{
#ifdef SCSI2_TAG
/*
* tagged queuing - allocate a new tag to this command
*/
if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
SCpnt->cmnd[0] != INQUIRY) {
SCpnt->device->current_tag += 1;
if (SCpnt->device->current_tag == 0)
SCpnt->device->current_tag = 1;
SCpnt->tag = SCpnt->device->current_tag;
} else
#endif
set_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
info->stats.removes += 1;
switch (SCpnt->cmnd[0]) {
case WRITE_6:
case WRITE_10:
case WRITE_12:
info->stats.writes += 1;
break;
case READ_6:
case READ_10:
case READ_12:
info->stats.reads += 1;
break;
default:
info->stats.miscs += 1;
break;
}
}
static void fas216_do_bus_device_reset(FAS216_Info *info,
struct scsi_cmnd *SCpnt)
{
struct message *msg;
/*
* claim host busy
*/
info->scsi.phase = PHASE_SELECTION;
info->scsi.SCp = SCpnt->SCp;
info->SCpnt = SCpnt;
info->dma.transfer_type = fasdma_none;
fas216_log(info, LOG_ERROR, "sending bus device reset");
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
/* following what the ESP driver says */
fas216_set_stc(info, 0);
fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
/* flush FIFO */
fas216_cmd(info, CMD_FLUSHFIFO);
/* load bus-id and timeout */
fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
/* synchronous transfers */
fas216_set_sync(info, SCpnt->device->id);
msg = msgqueue_getmsg(&info->scsi.msgs, 0);
fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
msg->fifo = 1;
fas216_cmd(info, CMD_SELECTATNSTOP);
}
/**
* fas216_kick - kick a command to the interface
* @info: our host interface to kick
*
* Kick a command to the interface, interface should be idle.
* Notes: Interrupts are always disabled!
*/
static void fas216_kick(FAS216_Info *info)
{
struct scsi_cmnd *SCpnt = NULL;
#define TYPE_OTHER 0
#define TYPE_RESET 1
#define TYPE_QUEUE 2
int where_from = TYPE_OTHER;
fas216_checkmagic(info);
/*
* Obtain the next command to process.
*/
do {
if (info->rstSCpnt) {
SCpnt = info->rstSCpnt;
/* don't remove it */
where_from = TYPE_RESET;
break;
}
if (info->reqSCpnt) {
SCpnt = info->reqSCpnt;
info->reqSCpnt = NULL;
break;
}
if (info->origSCpnt) {
SCpnt = info->origSCpnt;
info->origSCpnt = NULL;
break;
}
/* retrieve next command */
if (!SCpnt) {
SCpnt = queue_remove_exclude(&info->queues.issue,
info->busyluns);
where_from = TYPE_QUEUE;
break;
}
} while (0);
if (!SCpnt) {
/*
* no command pending, so enable reselection.
*/
fas216_cmd(info, CMD_ENABLESEL);
return;
}
/*
* We're going to start a command, so disable reselection
*/
fas216_cmd(info, CMD_DISABLESEL);
if (info->scsi.disconnectable && info->SCpnt) {
fas216_log(info, LOG_CONNECT,
"moved command for %d to disconnected queue",
info->SCpnt->device->id);
queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
info->scsi.disconnectable = 0;
info->SCpnt = NULL;
}
fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
"starting");
switch (where_from) {
case TYPE_QUEUE:
fas216_allocate_tag(info, SCpnt);
case TYPE_OTHER:
fas216_start_command(info, SCpnt);
break;
case TYPE_RESET:
fas216_do_bus_device_reset(info, SCpnt);
break;
}
fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
/*
* should now get either DISCONNECT or
* (FUNCTION DONE with BUS SERVICE) interrupt
*/
}
/*
* Clean up from issuing a BUS DEVICE RESET message to a device.
*/
static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
unsigned int result)
{
fas216_log(info, LOG_ERROR, "fas216 device reset complete");
info->rstSCpnt = NULL;
info->rst_dev_status = 1;
wake_up(&info->eh_wait);
}
/**
* fas216_rq_sns_done - Finish processing automatic request sense command
* @info: interface that completed
* @SCpnt: command that completed
* @result: driver byte of result
*
* Finish processing automatic request sense command
*/
static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
unsigned int result)
{
fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
"request sense complete, result=0x%04x%02x%02x",
result, SCpnt->SCp.Message, SCpnt->SCp.Status);
if (result != DID_OK || SCpnt->SCp.Status != GOOD)
/*
* Something went wrong. Make sure that we don't
* have valid data in the sense buffer that could
* confuse the higher levels.
*/
memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));
//printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
//{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
/*
* Note that we don't set SCpnt->result, since that should
* reflect the status of the command that we were asked by
* the upper layers to process. This would have been set
* correctly by fas216_std_done.
*/
scsi_eh_restore_cmnd(SCpnt, &info->ses);
SCpnt->scsi_done(SCpnt);
}
/**
* fas216_std_done - finish processing of standard command
* @info: interface that completed
* @SCpnt: command that completed
* @result: driver byte of result
*
* Finish processing of standard command
*/
static void
fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
{
info->stats.fins += 1;
SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
info->scsi.SCp.Status;
fas216_log_command(info, LOG_CONNECT, SCpnt,
"command complete, result=0x%08x", SCpnt->result);
/*
* If the driver detected an error, we're all done.
*/
if (host_byte(SCpnt->result) != DID_OK ||
msg_byte(SCpnt->result) != COMMAND_COMPLETE)
goto done;
/*
* If the command returned CHECK_CONDITION or COMMAND_TERMINATED
* status, request the sense information.
*/
if (status_byte(SCpnt->result) == CHECK_CONDITION ||
status_byte(SCpnt->result) == COMMAND_TERMINATED)
goto request_sense;
/*
* If the command did not complete with GOOD status,
* we are all done here.
*/
if (status_byte(SCpnt->result) != GOOD)
goto done;
/*
* We have successfully completed a command. Make sure that
* we do not have any buffers left to transfer. The world
* is not perfect, and we seem to occasionally hit this.
* It can be indicative of a buggy driver, target or the upper
* levels of the SCSI code.
*/
if (info->scsi.SCp.ptr) {
switch (SCpnt->cmnd[0]) {
case INQUIRY:
case START_STOP:
case MODE_SENSE:
break;
default:
printk(KERN_ERR "scsi%d.%c: incomplete data transfer "
"detected: res=%08X ptr=%p len=%X CDB: ",
info->host->host_no, '0' + SCpnt->device->id,
SCpnt->result, info->scsi.SCp.ptr,
info->scsi.SCp.this_residual);
__scsi_print_command(SCpnt->cmnd);
SCpnt->result &= ~(255 << 16);
SCpnt->result |= DID_BAD_TARGET << 16;
goto request_sense;
}
}
done:
if (SCpnt->scsi_done) {
SCpnt->scsi_done(SCpnt);
return;
}
panic("scsi%d.H: null scsi_done function in fas216_done",
info->host->host_no);
request_sense:
if (SCpnt->cmnd[0] == REQUEST_SENSE)
goto done;
scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
"requesting sense");
init_SCp(SCpnt);
SCpnt->SCp.Message = 0;
SCpnt->SCp.Status = 0;
SCpnt->tag = 0;
SCpnt->host_scribble = (void *)fas216_rq_sns_done;
/*
* Place this command into the high priority "request
* sense" slot. This will be the very next command
* executed, unless a target connects to us.
*/
if (info->reqSCpnt)
printk(KERN_WARNING "scsi%d.%c: loosing request command\n",
info->host->host_no, '0' + SCpnt->device->id);
info->reqSCpnt = SCpnt;
}
/**
* fas216_done - complete processing for current command
* @info: interface that completed
* @result: driver byte of result
*
* Complete processing for current command
*/
static void fas216_done(FAS216_Info *info, unsigned int result)
{
void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
struct scsi_cmnd *SCpnt;
unsigned long flags;
fas216_checkmagic(info);
if (!info->SCpnt)
goto no_command;
SCpnt = info->SCpnt;
info->SCpnt = NULL;
info->scsi.phase = PHASE_IDLE;
if (info->scsi.aborting) {
fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
result = DID_ABORT;
info->scsi.aborting = 0;
}
/*
* Sanity check the completion - if we have zero bytes left
* to transfer, we should not have a valid pointer.
*/
if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
printk("scsi%d.%c: zero bytes left to transfer, but "
"buffer pointer still valid: ptr=%p len=%08x CDB: ",
info->host->host_no, '0' + SCpnt->device->id,
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
info->scsi.SCp.ptr = NULL;
__scsi_print_command(SCpnt->cmnd);
}
/*
* Clear down this command as completed. If we need to request
* the sense information, fas216_kick will re-assert the busy
* status.
*/
info->device[SCpnt->device->id].parity_check = 0;
clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
fn(info, SCpnt, result);
if (info->scsi.irq != NO_IRQ) {
spin_lock_irqsave(&info->host_lock, flags);
if (info->scsi.phase == PHASE_IDLE)
fas216_kick(info);
spin_unlock_irqrestore(&info->host_lock, flags);
}
return;
no_command:
panic("scsi%d.H: null command in fas216_done",
info->host->host_no);
}
/**
* fas216_queue_command - queue a command for adapter to process.
* @SCpnt: Command to queue
* @done: done function to call once command is complete
*
* Queue a command for adapter to process.
* Returns: 0 on success, else error.
* Notes: io_request_lock is held, interrupts are disabled.
*/
static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
void (*done)(struct scsi_cmnd *))
{
FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
int result;
fas216_checkmagic(info);
fas216_log_command(info, LOG_CONNECT, SCpnt,
"received command (%p)", SCpnt);
SCpnt->scsi_done = done;
SCpnt->host_scribble = (void *)fas216_std_done;
SCpnt->result = 0;
init_SCp(SCpnt);
info->stats.queues += 1;
SCpnt->tag = 0;
spin_lock(&info->host_lock);
/*
* Add command into execute queue and let it complete under
* whatever scheme we're using.
*/
result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
/*
* If we successfully added the command,
* kick the interface to get it moving.
*/
if (result == 0 && info->scsi.phase == PHASE_IDLE)
fas216_kick(info);
spin_unlock(&info->host_lock);
fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
result ? "failure" : "success");
return result;
}
DEF_SCSI_QCMD(fas216_queue_command)
/**
* fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
* @SCpnt: Command to wake
*
* Trigger restart of a waiting thread in fas216_command
*/
static void fas216_internal_done(struct scsi_cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
fas216_checkmagic(info);
info->internal_done = 1;
}
/**
* fas216_noqueue_command - process a command for the adapter.
* @SCpnt: Command to queue
*
* Queue a command for adapter to process.
* Returns: scsi result code.
* Notes: io_request_lock is held, interrupts are disabled.
*/
static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
void (*done)(struct scsi_cmnd *))
{
FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
fas216_checkmagic(info);
/*
* We should only be using this if we don't have an interrupt.
* Provide some "incentive" to use the queueing code.
*/
BUG_ON(info->scsi.irq != NO_IRQ);
info->internal_done = 0;
fas216_queue_command_lck(SCpnt, fas216_internal_done);
/*
* This wastes time, since we can't return until the command is
* complete. We can't sleep either since we may get re-entered!
* However, we must re-enable interrupts, or else we'll be
* waiting forever.
*/
spin_unlock_irq(info->host->host_lock);
while (!info->internal_done) {
/*
* If we don't have an IRQ, then we must poll the card for
* it's interrupt, and use that to call this driver's
* interrupt routine. That way, we keep the command
* progressing. Maybe we can add some inteligence here
* and go to sleep if we know that the device is going
* to be some time (eg, disconnected).
*/
if (fas216_readb(info, REG_STAT) & STAT_INT) {
spin_lock_irq(info->host->host_lock);
fas216_intr(info);
spin_unlock_irq(info->host->host_lock);
}
}
spin_lock_irq(info->host->host_lock);
done(SCpnt);
return 0;
}
DEF_SCSI_QCMD(fas216_noqueue_command)
/*
* Error handler timeout function. Indicate that we timed out,
* and wake up any error handler process so it can continue.
*/
static void fas216_eh_timer(unsigned long data)
{
FAS216_Info *info = (FAS216_Info *)data;
fas216_log(info, LOG_ERROR, "error handling timed out\n");
del_timer(&info->eh_timer);
if (info->rst_bus_status == 0)
info->rst_bus_status = -1;
if (info->rst_dev_status == 0)
info->rst_dev_status = -1;
wake_up(&info->eh_wait);
}
enum res_find {
res_failed, /* not found */
res_success, /* command on issue queue */
res_hw_abort /* command on disconnected dev */
};
/**
* fas216_do_abort - decide how to abort a command
* @SCpnt: command to abort
*
* Decide how to abort a command.
* Returns: abort status
*/
static enum res_find fas216_find_command(FAS216_Info *info,
struct scsi_cmnd *SCpnt)
{
enum res_find res = res_failed;
if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
/*
* The command was on the issue queue, and has not been
* issued yet. We can remove the command from the queue,
* and acknowledge the abort. Neither the device nor the
* interface know about the command.
*/
printk("on issue queue ");
res = res_success;
} else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
/*
* The command was on the disconnected queue. We must
* reconnect with the device if possible, and send it
* an abort message.
*/
printk("on disconnected queue ");
res = res_hw_abort;
} else if (info->SCpnt == SCpnt) {
printk("executing ");
switch (info->scsi.phase) {
/*
* If the interface is idle, and the command is 'disconnectable',
* then it is the same as on the disconnected queue.
*/
case PHASE_IDLE:
if (info->scsi.disconnectable) {
info->scsi.disconnectable = 0;
info->SCpnt = NULL;
res = res_hw_abort;
}
break;
default:
break;
}
} else if (info->origSCpnt == SCpnt) {
/*
* The command will be executed next, but a command
* is currently using the interface. This is similar to
* being on the issue queue, except the busylun bit has
* been set.
*/
info->origSCpnt = NULL;
clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
printk("waiting for execution ");
res = res_success;
} else
printk("unknown ");
return res;
}
/**
* fas216_eh_abort - abort this command
* @SCpnt: command to abort
*
* Abort this command.
* Returns: FAILED if unable to abort
* Notes: io_request_lock is taken, and irqs are disabled
*/
int fas216_eh_abort(struct scsi_cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
int result = FAILED;
fas216_checkmagic(info);
info->stats.aborts += 1;
printk(KERN_WARNING "scsi%d: abort command ", info->host->host_no);
__scsi_print_command(SCpnt->cmnd);
print_debug_list();
fas216_dumpstate(info);
printk(KERN_WARNING "scsi%d: abort %p ", info->host->host_no, SCpnt);
switch (fas216_find_command(info, SCpnt)) {
/*
* We found the command, and cleared it out. Either
* the command is still known to be executing on the
* target, or the busylun bit is not set.
*/
case res_success:
printk("success\n");
result = SUCCESS;
break;
/*
* We need to reconnect to the target and send it an
* ABORT or ABORT_TAG message. We can only do this
* if the bus is free.
*/
case res_hw_abort:
/*
* We are unable to abort the command for some reason.
*/
default:
case res_failed:
printk("failed\n");
break;
}
return result;
}
/**
* fas216_eh_device_reset - Reset the device associated with this command
* @SCpnt: command specifing device to reset
*
* Reset the device associated with this command.
* Returns: FAILED if unable to reset.
* Notes: We won't be re-entered, so we'll only have one device
* reset on the go at one time.
*/
int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
unsigned long flags;
int i, res = FAILED, target = SCpnt->device->id;
fas216_log(info, LOG_ERROR, "device reset for target %d", target);
spin_lock_irqsave(&info->host_lock, flags);
do {
/*
* If we are currently connected to a device, and
* it is the device we want to reset, there is
* nothing we can do here. Chances are it is stuck,
* and we need a bus reset.
*/
if (info->SCpnt && !info->scsi.disconnectable &&
info->SCpnt->device->id == SCpnt->device->id)
break;
/*
* We're going to be resetting this device. Remove
* all pending commands from the driver. By doing
* so, we guarantee that we won't touch the command
* structures except to process the reset request.
*/
queue_remove_all_target(&info->queues.issue, target);
queue_remove_all_target(&info->queues.disconnected, target);
if (info->origSCpnt && info->origSCpnt->device->id == target)
info->origSCpnt = NULL;
if (info->reqSCpnt && info->reqSCpnt->device->id == target)
info->reqSCpnt = NULL;
for (i = 0; i < 8; i++)
clear_bit(target * 8 + i, info->busyluns);
/*
* Hijack this SCSI command structure to send
* a bus device reset message to this device.
*/
SCpnt->host_scribble = (void *)fas216_devicereset_done;
info->rst_dev_status = 0;
info->rstSCpnt = SCpnt;
if (info->scsi.phase == PHASE_IDLE)
fas216_kick(info);
mod_timer(&info->eh_timer, jiffies + 30 * HZ);
spin_unlock_irqrestore(&info->host_lock, flags);
/*
* Wait up to 30 seconds for the reset to complete.
*/
wait_event(info->eh_wait, info->rst_dev_status);
del_timer_sync(&info->eh_timer);
spin_lock_irqsave(&info->host_lock, flags);
info->rstSCpnt = NULL;
if (info->rst_dev_status == 1)
res = SUCCESS;
} while (0);
SCpnt->host_scribble = NULL;
spin_unlock_irqrestore(&info->host_lock, flags);
fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
res == SUCCESS ? "success" : "failed");
return res;
}
/**
* fas216_eh_bus_reset - Reset the bus associated with the command
* @SCpnt: command specifing bus to reset
*
* Reset the bus associated with the command.
* Returns: FAILED if unable to reset.
* Notes: Further commands are blocked.
*/
int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
unsigned long flags;
struct scsi_device *SDpnt;
fas216_checkmagic(info);
fas216_log(info, LOG_ERROR, "resetting bus");
info->stats.bus_resets += 1;
spin_lock_irqsave(&info->host_lock, flags);
/*
* Stop all activity on this interface.
*/
fas216_aborttransfer(info);
fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
/*
* Clear any pending interrupts.
*/
while (fas216_readb(info, REG_STAT) & STAT_INT)
fas216_readb(info, REG_INST);
info->rst_bus_status = 0;
/*
* For each attached hard-reset device, clear out
* all command structures. Leave the running
* command in place.
*/
shost_for_each_device(SDpnt, info->host) {
int i;
if (SDpnt->soft_reset)
continue;
queue_remove_all_target(&info->queues.issue, SDpnt->id);
queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
info->origSCpnt = NULL;
if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
info->reqSCpnt = NULL;
info->SCpnt = NULL;
for (i = 0; i < 8; i++)
clear_bit(SDpnt->id * 8 + i, info->busyluns);
}
info->scsi.phase = PHASE_IDLE;
/*
* Reset the SCSI bus. Device cleanup happens in
* the interrupt handler.
*/
fas216_cmd(info, CMD_RESETSCSI);
mod_timer(&info->eh_timer, jiffies + HZ);
spin_unlock_irqrestore(&info->host_lock, flags);
/*
* Wait one second for the interrupt.
*/
wait_event(info->eh_wait, info->rst_bus_status);
del_timer_sync(&info->eh_timer);
fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
info->rst_bus_status == 1 ? "success" : "failed");
return info->rst_bus_status == 1 ? SUCCESS : FAILED;
}
/**
* fas216_init_chip - Initialise FAS216 state after reset
* @info: state structure for interface
*
* Initialise FAS216 state after reset
*/
static void fas216_init_chip(FAS216_Info *info)
{
unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
fas216_writeb(info, REG_CLKF, clock);
fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
fas216_writeb(info, REG_SOF, 0);
fas216_writeb(info, REG_STP, info->scsi.async_stp);
fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
}
/**
* fas216_eh_host_reset - Reset the host associated with this command
* @SCpnt: command specifing host to reset
*
* Reset the host associated with this command.
* Returns: FAILED if unable to reset.
* Notes: io_request_lock is taken, and irqs are disabled
*/
int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
spin_lock_irq(info->host->host_lock);
fas216_checkmagic(info);
printk("scsi%d.%c: %s: resetting host\n",
info->host->host_no, '0' + SCpnt->device->id, __func__);
/*
* Reset the SCSI chip.
*/
fas216_cmd(info, CMD_RESETCHIP);
/*
* Ugly ugly ugly!
* We need to release the host_lock and enable
* IRQs if we sleep, but we must relock and disable
* IRQs after the sleep.
*/
spin_unlock_irq(info->host->host_lock);
msleep(50 * 1000/100);
spin_lock_irq(info->host->host_lock);
/*
* Release the SCSI reset.
*/
fas216_cmd(info, CMD_NOP);
fas216_init_chip(info);
spin_unlock_irq(info->host->host_lock);
return SUCCESS;
}
#define TYPE_UNKNOWN 0
#define TYPE_NCR53C90 1
#define TYPE_NCR53C90A 2
#define TYPE_NCR53C9x 3
#define TYPE_Am53CF94 4
#define TYPE_EmFAS216 5
#define TYPE_QLFAS216 6
static char *chip_types[] = {
"unknown",
"NS NCR53C90",
"NS NCR53C90A",
"NS NCR53C9x",
"AMD Am53CF94",
"Emulex FAS216",
"QLogic FAS216"
};
static int fas216_detect_type(FAS216_Info *info)
{
int family, rev;
/*
* Reset the chip.
*/
fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
udelay(50);
fas216_writeb(info, REG_CMD, CMD_NOP);
/*
* Check to see if control reg 2 is present.
*/
fas216_writeb(info, REG_CNTL3, 0);
fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
/*
* If we are unable to read back control reg 2
* correctly, it is not present, and we have a
* NCR53C90.
*/
if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
return TYPE_NCR53C90;
/*
* Now, check control register 3
*/
fas216_writeb(info, REG_CNTL2, 0);
fas216_writeb(info, REG_CNTL3, 0);
fas216_writeb(info, REG_CNTL3, 5);
/*
* If we are unable to read the register back
* correctly, we have a NCR53C90A
*/
if (fas216_readb(info, REG_CNTL3) != 5)
return TYPE_NCR53C90A;
/*
* Now read the ID from the chip.
*/
fas216_writeb(info, REG_CNTL3, 0);
fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
fas216_writeb(info, REG_CNTL3, 0);
fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
udelay(50);
fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
udelay(50);
fas216_writeb(info, REG_CMD, CMD_NOP);
rev = fas216_readb(info, REG_ID);
family = rev >> 3;
rev &= 7;
switch (family) {
case 0x01:
if (rev == 4)
return TYPE_Am53CF94;
break;
case 0x02:
switch (rev) {
case 2:
return TYPE_EmFAS216;
case 3:
return TYPE_QLFAS216;
}
break;
default:
break;
}
printk("family %x rev %x\n", family, rev);
return TYPE_NCR53C9x;
}
/**
* fas216_reset_state - Initialise driver internal state
* @info: state to initialise
*
* Initialise driver internal state
*/
static void fas216_reset_state(FAS216_Info *info)
{
int i;
fas216_checkmagic(info);
fas216_bus_reset(info);
/*
* Clear out all stale info in our state structure
*/
memset(info->busyluns, 0, sizeof(info->busyluns));
info->scsi.disconnectable = 0;
info->scsi.aborting = 0;
for (i = 0; i < 8; i++) {
info->device[i].parity_enabled = 0;
info->device[i].parity_check = 1;
}
/*
* Drain all commands on disconnected queue
*/
while (queue_remove(&info->queues.disconnected) != NULL);
/*
* Remove executing commands.
*/
info->SCpnt = NULL;
info->reqSCpnt = NULL;
info->rstSCpnt = NULL;
info->origSCpnt = NULL;
}
/**
* fas216_init - initialise FAS/NCR/AMD SCSI structures.
* @host: a driver-specific filled-out structure
*
* Initialise FAS/NCR/AMD SCSI structures.
* Returns: 0 on success
*/
int fas216_init(struct Scsi_Host *host)
{
FAS216_Info *info = (FAS216_Info *)host->hostdata;
info->magic_start = MAGIC;
info->magic_end = MAGIC;
info->host = host;
info->scsi.cfg[0] = host->this_id | CNTL1_PERE;
info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE;
info->scsi.cfg[2] = info->ifcfg.cntl3 |
CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
info->rst_dev_status = -1;
info->rst_bus_status = -1;
init_waitqueue_head(&info->eh_wait);
init_timer(&info->eh_timer);
info->eh_timer.data = (unsigned long)info;
info->eh_timer.function = fas216_eh_timer;
spin_lock_init(&info->host_lock);
memset(&info->stats, 0, sizeof(info->stats));
msgqueue_initialise(&info->scsi.msgs);
if (!queue_initialise(&info->queues.issue))
return -ENOMEM;
if (!queue_initialise(&info->queues.disconnected)) {
queue_free(&info->queues.issue);
return -ENOMEM;
}
return 0;
}
/**
* fas216_add - initialise FAS/NCR/AMD SCSI ic.
* @host: a driver-specific filled-out structure
* @dev: parent device
*
* Initialise FAS/NCR/AMD SCSI ic.
* Returns: 0 on success
*/
int fas216_add(struct Scsi_Host *host, struct device *dev)
{
FAS216_Info *info = (FAS216_Info *)host->hostdata;
int type, ret;
if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
info->ifcfg.clockrate);
return -EINVAL;
}
fas216_reset_state(info);
type = fas216_detect_type(info);
info->scsi.type = chip_types[type];
udelay(300);
/*
* Initialise the chip correctly.
*/
fas216_init_chip(info);
/*
* Reset the SCSI bus. We don't want to see
* the resulting reset interrupt, so mask it
* out.
*/
fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
/*
* scsi standard says wait 250ms
*/
spin_unlock_irq(info->host->host_lock);
msleep(100*1000/100);
spin_lock_irq(info->host->host_lock);
fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
fas216_readb(info, REG_INST);
fas216_checkmagic(info);
ret = scsi_add_host(host, dev);
if (ret)
fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
else
scsi_scan_host(host);
return ret;
}
void fas216_remove(struct Scsi_Host *host)
{
FAS216_Info *info = (FAS216_Info *)host->hostdata;
fas216_checkmagic(info);
scsi_remove_host(host);
fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
scsi_host_put(host);
}
/**
* fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
* @host: a driver-specific filled-out structure
*
* release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
*/
void fas216_release(struct Scsi_Host *host)
{
FAS216_Info *info = (FAS216_Info *)host->hostdata;
queue_free(&info->queues.disconnected);
queue_free(&info->queues.issue);
}
int fas216_print_host(FAS216_Info *info, char *buffer)
{
return sprintf(buffer,
"\n"
"Chip : %s\n"
" Address: 0x%p\n"
" IRQ : %d\n"
" DMA : %d\n",
info->scsi.type, info->scsi.io_base,
info->scsi.irq, info->scsi.dma);
}
int fas216_print_stats(FAS216_Info *info, char *buffer)
{
char *p = buffer;
p += sprintf(p, "\n"
"Command Statistics:\n"
" Queued : %u\n"
" Issued : %u\n"
" Completed : %u\n"
" Reads : %u\n"
" Writes : %u\n"
" Others : %u\n"
" Disconnects: %u\n"
" Aborts : %u\n"
" Bus resets : %u\n"
" Host resets: %u\n",
info->stats.queues, info->stats.removes,
info->stats.fins, info->stats.reads,
info->stats.writes, info->stats.miscs,
info->stats.disconnects, info->stats.aborts,
info->stats.bus_resets, info->stats.host_resets);
return p - buffer;
}
int fas216_print_devices(FAS216_Info *info, char *buffer)
{
struct fas216_device *dev;
struct scsi_device *scd;
char *p = buffer;
p += sprintf(p, "Device/Lun TaggedQ Parity Sync\n");
shost_for_each_device(scd, info->host) {
dev = &info->device[scd->id];
p += sprintf(p, " %d/%d ", scd->id, scd->lun);
if (scd->tagged_supported)
p += sprintf(p, "%3sabled(%3d) ",
scd->simple_tags ? "en" : "dis",
scd->current_tag);
else
p += sprintf(p, "unsupported ");
p += sprintf(p, "%3sabled ", dev->parity_enabled ? "en" : "dis");
if (dev->sof)
p += sprintf(p, "offset %d, %d ns\n",
dev->sof, dev->period * 4);
else
p += sprintf(p, "async\n");
}
return p - buffer;
}
EXPORT_SYMBOL(fas216_init);
EXPORT_SYMBOL(fas216_add);
EXPORT_SYMBOL(fas216_queue_command);
EXPORT_SYMBOL(fas216_noqueue_command);
EXPORT_SYMBOL(fas216_intr);
EXPORT_SYMBOL(fas216_remove);
EXPORT_SYMBOL(fas216_release);
EXPORT_SYMBOL(fas216_eh_abort);
EXPORT_SYMBOL(fas216_eh_device_reset);
EXPORT_SYMBOL(fas216_eh_bus_reset);
EXPORT_SYMBOL(fas216_eh_host_reset);
EXPORT_SYMBOL(fas216_print_host);
EXPORT_SYMBOL(fas216_print_stats);
EXPORT_SYMBOL(fas216_print_devices);
MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
MODULE_LICENSE("GPL");
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