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/*
* linux/arch/arm/drivers/scsi/fas216.c
*
* Copyright (C) 1997-2000 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.
*
* Todo:
* - allow individual devices to enable sync xfers.
*/
#include <linux/module.h>
#include <linux/blk.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/unistd.h>
#include <linux/stat.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/ecard.h>
#define FAS216_C
#include "../../scsi/scsi.h"
#include "../../scsi/hosts.h"
#include "fas216.h"
#define VER_MAJOR 0
#define VER_MINOR 0
#define VER_PATCH 5
/* 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_WIDE
#undef SCSI2_TAG
#undef DEBUG_CONNECT
#undef DEBUG_BUSSERVICE
#undef DEBUG_FUNCTIONDONE
#undef DEBUG_MESSAGES
#undef CHECK_STRUCTURE
static struct { int stat, ssr, isr, ph; } list[8];
static int ptr;
static void fas216_dumpstate(FAS216_Info *info)
{
unsigned char is, stat, inst;
is = inb(REG_IS(info));
stat = inb(REG_STAT(info));
inst = inb(REG_INST(info));
printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
" INST=%02X IS=%02X CFIS=%02X",
inb(REG_CTCL(info)), inb(REG_CTCM(info)),
inb(REG_CMD(info)), stat, inst, is,
inb(REG_CFIS(info)));
printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
inb(REG_CNTL1(info)), inb(REG_CNTL2(info)),
inb(REG_CNTL3(info)), inb(REG_CTCH(info)));
}
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_port=%X io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
info->scsi.io_port, 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 reconnected={ target=%d lun=%d tag=%d }\n",
info->scsi.type, info->scsi.phase,
info->scsi.reconnected.target,
info->scsi.reconnected.lun, info->scsi.reconnected.tag);
printk(" SCp={ ptr=%p this_residual=%X buffer=%p buffers_residual=%X }\n",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
info->scsi.SCp.buffer, info->scsi.SCp.buffers_residual);
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]=%X 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), __FUNCTION__)
#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)
{
switch (info->scsi.phase) {
case PHASE_IDLE: return "idle";
case PHASE_SELECTION: return "selection";
case PHASE_COMMAND: return "command";
case PHASE_RECONNECTED: return "reconnected";
case PHASE_DATAOUT: return "data out";
case PHASE_DATAIN: return "data in";
case PHASE_MSGIN: return "message in";
case PHASE_MSGIN_DISCONNECT: return "disconnect";
case PHASE_MSGOUT_EXPECT: return "expect message out";
case PHASE_MSGOUT: return "message out";
case PHASE_STATUS: return "status";
case PHASE_DONE: return "done";
default: return "???";
}
}
static char fas216_target(FAS216_Info *info)
{
if (info->SCpnt)
return '0' + info->SCpnt->target;
else
return 'H';
}
static void add_debug_list(int stat, int ssr, int isr, int ph)
{
list[ptr].stat = stat;
list[ptr].ssr = ssr;
list[ptr].isr = isr;
list[ptr].ph = ph;
ptr = (ptr + 1) & 7;
}
static void print_debug_list(void)
{
int i;
i = ptr;
printk(KERN_ERR "SCSI IRQ trail: ");
do {
printk("%02X:%02X:%02X:%1X ",
list[i].stat, list[i].ssr,
list[i].isr, list[i].ph);
i = (i + 1) & 7;
} while (i != ptr);
printk("\n");
}
static void fas216_done(FAS216_Info *info, unsigned int result);
/* Function: int fas216_clockrate(unsigned int clock)
* Purpose : calculate correct value to be written into clock conversion
* factor register.
* Params : clock - clock speed in MHz
* Returns : CLKF_ value
*/
static int fas216_clockrate(int clock)
{
if (clock <= 10 || clock > 40) {
printk(KERN_CRIT
"fas216: invalid clock rate: check your driver!\n");
clock = -1;
} else
clock = ((clock - 1) / 5 + 1) & 7;
return clock;
}
/* Function: unsigned short fas216_get_last_msg(FAS216_Info *info, int pos)
* Purpose : retrieve a last message from the list, using position in fifo
* Params : info - interface to search
* : pos - current fifo position
*/
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];
}
#ifdef DEBUG_MESSAGES
printk("Message: %04X found at position %02X\n",
packed_msg, pos);
#endif
return packed_msg;
}
/* Function: int fas216_syncperiod(FAS216_Info *info, int ns)
* Purpose : Calculate value to be loaded into the STP register
* for a given period in ns
* Params : info - state structure for interface connected to device
* : ns - period in ns (between subsequent bytes)
* Returns : 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;
}
/* Function: void fas216_set_sync(FAS216_Info *info, int target)
* Purpose : Correctly setup FAS216 chip for specified transfer period.
* Params : info - state structure for interface
* : target - target
* 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)
{
outb(info->device[target].sof, REG_SOF(info));
outb(info->device[target].stp, REG_STP(info));
if (info->device[target].period >= (200 / 4))
outb(info->scsi.cfg[2] & ~CNTL3_FASTSCSI, REG_CNTL3(info));
else
outb(info->scsi.cfg[2], REG_CNTL3(info));
}
/* 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 negociation request on
* every INQUIRY or REQUEST SENSE message, unless the target itself has
* at some point performed a synchronous transfer negociation request, or
* we have synchronous transfers disabled for this device.
*/
/* Function: void fas216_handlesync(FAS216_Info *info, char *msg)
* Purpose : Handle a synchronous transfer message from the target
* Params : info - state structure for interface
* : msg - message from target
*/
static void
fas216_handlesync(FAS216_Info *info, char *msg)
{
struct fas216_device *dev = &info->device[info->SCpnt->target];
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
* negociation 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 negociating a synchronous transfer,
* but the device sent us a negociation request.
* Honour the request by sending back a SDTR
* message containing our capability, limited by
* the targets capability.
*/
default:
outb(CMD_SETATN, REG_CMD(info));
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 negociation,
* 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->target);
break;
case reject:
outb(CMD_SETATN, REG_CMD(info));
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->target);
break;
case none:
break;
}
}
/* Function: void fas216_handlewide(FAS216_Info *info, char *msg)
* Purpose : Handle a wide transfer message from the target
* Params : info - state structure for interface
* : msg - message from target
*/
static void
fas216_handlewide(FAS216_Info *info, char *msg)
{
struct fas216_device *dev = &info->device[info->SCpnt->target];
enum { wide, bit8, none, reject } res = none;
#ifdef SCSI2_WIDE
switch (msg[0]) {
case MESSAGE_REJECT:
/* Wide transfer request failed.
* Note: SCSI II r10:
*
* SCSI devices that are capable of wide
* data transfers shall not respond to a
* WDTR message with a MESSAGE REJECT message.
*
* Hence, if we get this condition, we never
* reattempt negociation for this device.
*/
if (dev->wide_state == neg_inprogress) {
dev->wide_state = neg_invalid;
res = bit8;
}
break;
case EXTENDED_MESSAGE:
switch (dev->wide_state) {
/* We don't accept wide data transfer requests.
* Respond with a MESSAGE REJECT to prevent a
* wide data transfer agreement from being reached.
*/
case neg_invalid:
res = reject;
break;
/* We were not negociating a wide data transfer,
* but the device sent is a negociation request.
* Honour the request by sending back a WDTR
* message containing our capability, limited by
* the targets capability.
*/
default:
outb(CMD_SETATN, REG_CMD(info));
if (msg[3] > info->ifcfg.wide_max_size)
msg[3] = info->ifcfg.wide_max_size;
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 4,
EXTENDED_MESSAGE, 2, EXTENDED_WDTR,
msg[3]);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
res = wide;
break;
/* We initiated the wide data transfer negociation,
* 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[3] <= info->ifcfg.wide_max_size) {
dev->wide_state = neg_complete;
res = wide;
}
break;
}
}
#else
res = reject;
#endif
switch (res) {
case wide:
dev->wide_xfer = msg[3];
break;
case reject:
outb(CMD_SETATN, REG_CMD(info));
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
case bit8:
dev->wide_xfer = 0;
break;
case none:
break;
}
}
/* Function: void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
* Purpose : update data pointers after transfer suspended/paused
* Params : info - interface's local pointer to update
* bytes_transferred - number of bytes transferred
*/
static void
fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
{
unsigned char *ptr;
unsigned int residual;
fas216_checkmagic(info);
ptr = info->scsi.SCp.ptr;
residual = info->scsi.SCp.this_residual;
info->SCpnt->request_bufflen -= bytes_transferred;
while (residual <= bytes_transferred && bytes_transferred) {
/* We have used up this buffer */
bytes_transferred -= residual;
if (info->scsi.SCp.buffers_residual) {
info->scsi.SCp.buffer++;
info->scsi.SCp.buffers_residual--;
ptr = (unsigned char *)info->scsi.SCp.buffer->address;
residual = info->scsi.SCp.buffer->length;
} else {
ptr = NULL;
residual = 0;
}
}
residual -= bytes_transferred;
ptr += bytes_transferred;
if (residual == 0)
ptr = NULL;
info->scsi.SCp.ptr = ptr;
info->scsi.SCp.this_residual = residual;
}
/* Function: void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
* Purpose : transfer data off of/on to card using programmed IO
* Params : info - interface to transfer data to/from
* direction - direction to transfer data (DMA_OUT/DMA_IN)
* Notes : this is incredibly slow
*/
static void
fas216_pio(FAS216_Info *info, fasdmadir_t direction)
{
unsigned int residual;
char *ptr;
fas216_checkmagic(info);
residual = info->scsi.SCp.this_residual;
ptr = info->scsi.SCp.ptr;
if (direction == DMA_OUT)
outb(*ptr++, REG_FF(info));
else
*ptr++ = inb(REG_FF(info));
residual -= 1;
if (residual == 0) {
if (info->scsi.SCp.buffers_residual) {
info->scsi.SCp.buffer++;
info->scsi.SCp.buffers_residual--;
ptr = (unsigned char *)info->scsi.SCp.buffer->address;
residual = info->scsi.SCp.buffer->length;
} else {
ptr = NULL;
residual = 0;
}
}
info->scsi.SCp.ptr = ptr;
info->scsi.SCp.this_residual = residual;
}
/* Function: void fas216_starttransfer(FAS216_Info *info,
* fasdmadir_t direction)
* Purpose : Start a DMA/PIO transfer off of/on to card
* Params : info - interface from which device disconnected from
* direction - transfer direction (DMA_OUT/DMA_IN)
*/
static void
fas216_starttransfer(FAS216_Info *info, fasdmadir_t direction, int flush_fifo)
{
fasdmatype_t dmatype;
fas216_checkmagic(info);
info->scsi.phase = (direction == DMA_OUT) ?
PHASE_DATAOUT : PHASE_DATAIN;
if (info->dma.transfer_type != fasdma_none &&
info->dma.transfer_type != fasdma_pio) {
unsigned long total, residual;
if (info->dma.transfer_type == fasdma_real_all)
total = info->SCpnt->request_bufflen;
else
total = info->scsi.SCp.this_residual;
residual = (inb(REG_CFIS(info)) & CFIS_CF) +
inb(REG_CTCL(info)) +
(inb(REG_CTCM(info)) << 8) +
(inb(REG_CTCH(info)) << 16);
fas216_updateptrs(info, total - residual);
}
info->dma.transfer_type = fasdma_none;
if (!info->scsi.SCp.ptr) {
printk("scsi%d.%c: null buffer passed to "
"fas216_starttransfer\n", info->host->host_no,
fas216_target(info));
return;
}
/* flush FIFO */
if (flush_fifo)
outb(CMD_FLUSHFIFO, REG_CMD(info));
/*
* Default to PIO mode or DMA mode if we have a synchronous
* transfer agreement.
*/
if (info->device[info->SCpnt->target].sof && info->dma.setup)
dmatype = fasdma_real_all;
else
dmatype = fasdma_pio;
if (info->dma.setup)
dmatype = info->dma.setup(info->host, &info->scsi.SCp,
direction, dmatype);
info->dma.transfer_type = dmatype;
switch (dmatype) {
case fasdma_pio:
outb(0, REG_SOF(info));
outb(info->scsi.async_stp, REG_STP(info));
outb(info->scsi.SCp.this_residual, REG_STCL(info));
outb(info->scsi.SCp.this_residual >> 8, REG_STCM(info));
outb(info->scsi.SCp.this_residual >> 16, REG_STCH(info));
outb(CMD_TRANSFERINFO, REG_CMD(info));
fas216_pio(info, direction);
break;
case fasdma_pseudo:
outb(info->scsi.SCp.this_residual, REG_STCL(info));
outb(info->scsi.SCp.this_residual >> 8, REG_STCM(info));
outb(info->scsi.SCp.this_residual >> 16, REG_STCH(info));
outb(CMD_TRANSFERINFO | CMD_WITHDMA, REG_CMD(info));
info->dma.pseudo(info->host, &info->scsi.SCp,
direction, info->SCpnt->transfersize);
break;
case fasdma_real_block:
outb(info->scsi.SCp.this_residual, REG_STCL(info));
outb(info->scsi.SCp.this_residual >> 8, REG_STCM(info));
outb(info->scsi.SCp.this_residual >> 16, REG_STCH(info));
outb(CMD_TRANSFERINFO | CMD_WITHDMA, REG_CMD(info));
break;
case fasdma_real_all:
outb(info->SCpnt->request_bufflen, REG_STCL(info));
outb(info->SCpnt->request_bufflen >> 8, REG_STCM(info));
outb(info->SCpnt->request_bufflen >> 16, REG_STCH(info));
outb(CMD_TRANSFERINFO | CMD_WITHDMA, REG_CMD(info));
break;
default:
printk(KERN_ERR "scsi%d.%d: invalid FAS216 DMA type\n",
info->host->host_no, fas216_target(info));
break;
}
}
/* Function: void fas216_stoptransfer(FAS216_Info *info)
* Purpose : Stop a DMA transfer onto / off of the card
* Params : info - interface from which device disconnected from
*/
static void
fas216_stoptransfer(FAS216_Info *info)
{
fas216_checkmagic(info);
if (info->dma.transfer_type != fasdma_none &&
info->dma.transfer_type != fasdma_pio) {
unsigned long total, residual;
if ((info->dma.transfer_type == fasdma_real_all ||
info->dma.transfer_type == fasdma_real_block) &&
info->dma.stop)
info->dma.stop(info->host, &info->scsi.SCp);
if (info->dma.transfer_type == fasdma_real_all)
total = info->SCpnt->request_bufflen;
else
total = info->scsi.SCp.this_residual;
residual = (inb(REG_CFIS(info)) & CFIS_CF) +
inb(REG_CTCL(info)) +
(inb(REG_CTCM(info)) << 8) +
(inb(REG_CTCH(info)) << 16);
fas216_updateptrs(info, total - residual);
info->dma.transfer_type = fasdma_none;
}
if (info->scsi.phase == PHASE_DATAOUT)
outb(CMD_FLUSHFIFO, REG_CMD(info));
}
/* Function: void fas216_disconnected_intr(FAS216_Info *info)
* Purpose : handle device disconnection
* Params : info - interface from which device disconnected from
*/
static void
fas216_disconnect_intr(FAS216_Info *info)
{
fas216_checkmagic(info);
#ifdef DEBUG_CONNECT
printk("scsi%d.%c: disconnect phase=%02X\n", info->host->host_no,
fas216_target(info), info->scsi.phase);
#endif
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 */
outb(CMD_ENABLESEL, REG_CMD(info));
info->scsi.disconnectable = 1;
info->scsi.reconnected.tag = 0;
info->scsi.phase = PHASE_IDLE;
info->stats.disconnects += 1;
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;
}
}
/* Function: void fas216_reselected_intr(FAS216_Info *info)
* Purpose : Start reconnection of a device
* Params : info - interface which was reselected
*/
static void
fas216_reselected_intr(FAS216_Info *info)
{
unsigned char target, identify_msg, ok;
fas216_checkmagic(info);
if ((info->scsi.phase == PHASE_SELECTION ||
info->scsi.phase == PHASE_SELSTEPS) && info->SCpnt) {
Scsi_Cmnd *SCpnt = info->SCpnt;
info->origSCpnt = SCpnt;
info->SCpnt = NULL;
if (info->device[SCpnt->target].wide_state == neg_inprogress)
info->device[SCpnt->target].wide_state = neg_wait;
if (info->device[SCpnt->target].sync_state == neg_inprogress)
info->device[SCpnt->target].sync_state = neg_wait;
}
#ifdef DEBUG_CONNECT
printk("scsi%d.%c: reconnect phase=%02X\n", info->host->host_no,
fas216_target(info), info->scsi.phase);
#endif
if ((inb(REG_CFIS(info)) & CFIS_CF) != 2) {
printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
info->host->host_no);
outb(CMD_SETATN, REG_CMD(info));
outb(CMD_MSGACCEPTED, REG_CMD(info));
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
return;
}
target = inb(REG_FF(info));
identify_msg = inb(REG_FF(info));
ok = 1;
if (!(target & (1 << info->host->this_id))) {
printk(KERN_ERR "scsi%d.H: invalid host id on reselect\n", info->host->host_no);
ok = 0;
}
if (!(identify_msg & 0x80)) {
printk(KERN_ERR "scsi%d.H: no IDENTIFY message on reselect, got msg %02X\n",
info->host->host_no, identify_msg);
ok = 0;
}
if (!ok) {
/*
* Something went wrong - send an initiator error to
* the target.
*/
outb(CMD_SETATN, REG_CMD(info));
outb(CMD_MSGACCEPTED, REG_CMD(info));
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
return;
}
target &= ~(1 << info->host->this_id);
switch (target) {
case 1: target = 0; break;
case 2: target = 1; break;
case 4: target = 2; break;
case 8: target = 3; break;
case 16: target = 4; break;
case 32: target = 5; break;
case 64: target = 6; break;
case 128: target = 7; break;
default: target = info->host->this_id; break;
}
identify_msg &= 7;
info->scsi.reconnected.target = target;
info->scsi.reconnected.lun = identify_msg;
info->scsi.reconnected.tag = 0;
ok = 0;
if (info->scsi.disconnectable && info->SCpnt &&
info->SCpnt->target == target && info->SCpnt->lun == identify_msg)
ok = 1;
if (!ok && queue_probetgtlun(&info->queues.disconnected, target, identify_msg))
ok = 1;
msgqueue_flush(&info->scsi.msgs);
if (ok) {
info->scsi.phase = PHASE_RECONNECTED;
outb(target, REG_SDID(info));
} 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.
*/
outb(CMD_SETATN, REG_CMD(info));
msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
}
outb(CMD_MSGACCEPTED, REG_CMD(info));
}
/* Function: void fas216_finish_reconnect(FAS216_Info *info)
* Purpose : finish reconnection sequence for device
* Params : info - interface which caused function done interrupt
*/
static void
fas216_finish_reconnect(FAS216_Info *info)
{
fas216_checkmagic(info);
#ifdef DEBUG_CONNECT
printk("Connected: %1X %1X %02X, reconnected: %1X %1X %02X\n",
info->SCpnt->target, info->SCpnt->lun, info->SCpnt->tag,
info->scsi.reconnected.target, info->scsi.reconnected.lun,
info->scsi.reconnected.tag);
#endif
if (info->scsi.disconnectable && info->SCpnt) {
info->scsi.disconnectable = 0;
if (info->SCpnt->target == info->scsi.reconnected.target &&
info->SCpnt->lun == info->scsi.reconnected.lun &&
info->SCpnt->tag == info->scsi.reconnected.tag) {
#ifdef DEBUG_CONNECT
printk("scsi%d.%c: reconnected",
info->host->host_no, fas216_target(info));
#endif
} else {
queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
#ifdef DEBUG_CONNECT
printk("scsi%d.%c: had to move command to disconnected queue\n",
info->host->host_no, fas216_target(info));
#endif
info->SCpnt = NULL;
}
}
if (!info->SCpnt) {
info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
info->scsi.reconnected.target,
info->scsi.reconnected.lun,
info->scsi.reconnected.tag);
#ifdef DEBUG_CONNECT
printk("scsi%d.%c: had to get command",
info->host->host_no, fas216_target(info));
#endif
}
if (!info->SCpnt) {
outb(CMD_SETATN, REG_CMD(info));
msgqueue_flush(&info->scsi.msgs);
#if 0
if (info->scsi.reconnected.tag)
msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, info->scsi.reconnected.tag);
else
#endif
msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
info->scsi.aborting = 1;
} else {
/*
* Restore data pointer from SAVED data pointer
*/
info->scsi.SCp = info->SCpnt->SCp;
#ifdef DEBUG_CONNECT
printk(", data pointers: [%p, %X]",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
#endif
}
#ifdef DEBUG_CONNECT
printk("\n");
#endif
}
static int fas216_wait_cmd(FAS216_Info *info, int cmd)
{
int tout;
int stat;
outb(cmd, REG_CMD(info));
for (tout = 1000; tout; tout -= 1) {
stat = inb(REG_STAT(info));
if (stat & STAT_INT)
break;
udelay(1);
}
return stat;
}
static int fas216_get_msg_byte(FAS216_Info *info)
{
int stat;
stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
if ((stat & STAT_INT) == 0)
goto timedout;
if ((stat & STAT_BUSMASK) != STAT_MESGIN)
goto unexpected_phase_change;
inb(REG_INST(info));
stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
if ((stat & STAT_INT) == 0)
goto timedout;
if ((stat & STAT_BUSMASK) != STAT_MESGIN)
goto unexpected_phase_change;
inb(REG_INST(info));
return inb(REG_FF(info));
timedout:
printk("scsi%d.%c: timed out waiting for message byte\n",
info->host->host_no, fas216_target(info));
return -1;
unexpected_phase_change:
printk("scsi%d.%c: unexpected phase change: status = %02X\n",
info->host->host_no, fas216_target(info), stat);
return -2;
}
/* Function: void fas216_message(FAS216_Info *info)
* Purpose : handle a function done interrupt from FAS216 chip
* Params : info - interface which caused function done interrupt
*/
static void fas216_message(FAS216_Info *info)
{
unsigned char *message = info->scsi.message;
unsigned int msglen = 1, i;
int msgbyte = 0;
fas216_checkmagic(info);
message[0] = inb(REG_FF(info));
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;
}
}
}
info->scsi.msglen = msglen;
#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
if (info->scsi.phase == PHASE_RECONNECTED) {
if (message[0] == SIMPLE_QUEUE_TAG)
info->scsi.reconnected.tag = message[1];
fas216_finish_reconnect(info);
info->scsi.phase = PHASE_MSGIN;
}
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;
#if defined (DEBUG_MESSAGES) || defined (DEBUG_CONNECT)
printk("scsi%d.%c: save data pointers: [%p, %X]\n",
info->host->host_no, fas216_target(info),
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
#endif
break;
case RESTORE_POINTERS:
if (msglen != 1)
goto unrecognised;
/*
* Restore current data pointer from SAVED data pointer
*/
info->scsi.SCp = info->SCpnt->SCp;
#if defined (DEBUG_MESSAGES) || defined (DEBUG_CONNECT)
printk("scsi%d.%c: restore data pointers: [%p, %X]\n",
info->host->host_no, fas216_target(info),
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
#endif
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;
case EXTENDED_MESSAGE | EXTENDED_WDTR << 8:
fas216_handlewide(info, message);
break;
default:
printk("scsi%d.%c: reject, last message %04X\n",
info->host->host_no, fas216_target(info),
fas216_get_last_msg(info, info->scsi.msgin_fifo));
}
break;
case NOP:
break;
case SIMPLE_QUEUE_TAG:
if (msglen < 2)
goto unrecognised;
/* handled above - print a warning since this is untested */
printk("scsi%d.%c: reconnect queue tag %02X\n",
info->host->host_no, fas216_target(info),
message[1]);
break;
case EXTENDED_MESSAGE:
if (msglen < 3)
goto unrecognised;
switch (message[2]) {
case EXTENDED_SDTR: /* Sync transfer negociation request/reply */
fas216_handlesync(info, message);
break;
case EXTENDED_WDTR: /* Wide transfer negociation request/reply */
fas216_handlewide(info, message);
break;
default:
goto unrecognised;
}
break;
default:
goto unrecognised;
}
outb(CMD_MSGACCEPTED, REG_CMD(info));
return;
unrecognised:
printk("scsi%d.%c: unrecognised message, rejecting\n",
info->host->host_no, fas216_target(info));
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.
*/
outb(CMD_NOP, REG_CMD(info));
fas216_dumpstate(info);
outb(CMD_SETATN, REG_CMD(info));
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
fas216_dumpstate(info);
outb(CMD_MSGACCEPTED, REG_CMD(info));
}
/* Function: void fas216_send_command(FAS216_Info *info)
* Purpose : send a command to a target after all message bytes have been sent
* Params : info - interface which caused bus service
*/
static void fas216_send_command(FAS216_Info *info)
{
int i;
fas216_checkmagic(info);
outb(CMD_NOP|CMD_WITHDMA, REG_CMD(info));
outb(CMD_FLUSHFIFO, REG_CMD(info));
/* load command */
for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
outb(info->SCpnt->cmnd[i], REG_FF(info));
outb(CMD_TRANSFERINFO, REG_CMD(info));
info->scsi.phase = PHASE_COMMAND;
}
/* Function: void fas216_send_messageout(FAS216_Info *info, int start)
* Purpose : handle bus service to send a message
* Params : info - interface which caused bus service
* 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);
outb(CMD_FLUSHFIFO, REG_CMD(info));
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++)
outb(msg->msg[i], REG_FF(info));
msg->fifo = tot_msglen - (inb(REG_CFIS(info)) & CFIS_CF);
start = 0;
}
} else
outb(NOP, REG_FF(info));
outb(CMD_TRANSFERINFO, REG_CMD(info));
info->scsi.phase = PHASE_MSGOUT;
}
/* Function: void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int ssr)
* Purpose : handle a bus service interrupt from FAS216 chip
* Params : info - interface which caused bus service interrupt
* stat - Status register contents
* ssr - SCSI Status register contents
*/
static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int ssr)
{
fas216_checkmagic(info);
#ifdef DEBUG_BUSSERVICE
printk("scsi%d.%c: bus service: stat=%02X ssr=%02X phase=%02X\n",
info->host->host_no, fas216_target(info), stat, ssr, info->scsi.phase);
#endif
switch (info->scsi.phase) {
case PHASE_SELECTION:
if ((ssr & IS_BITS) != 1)
goto bad_is;
break;
case PHASE_SELSTEPS:
switch (ssr & 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;
}
outb(CMD_NOP, REG_CMD(info));
#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)) {
/* Reselmsgin -> Data In */
case STATE(STAT_DATAIN, PHASE_RECONNECTED):
fas216_finish_reconnect(info);
case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */
case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> 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 */
fas216_starttransfer(info, DMA_IN, 0);
return;
case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */
fas216_starttransfer(info, DMA_OUT, 0);
return;
/* Reselmsgin -> Data Out */
case STATE(STAT_DATAOUT, PHASE_RECONNECTED):
fas216_finish_reconnect(info);
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_starttransfer(info, DMA_OUT, 1);
return;
/* Reselmsgin -> Status */
case STATE(STAT_STATUS, PHASE_RECONNECTED):
fas216_finish_reconnect(info);
goto status;
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 */
status:
outb(CMD_INITCMDCOMPLETE, REG_CMD(info));
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 = inb(REG_CFIS(info)) & CFIS_CF;
outb(CMD_FLUSHFIFO, REG_CMD(info));
outb(CMD_TRANSFERINFO, REG_CMD(info));
info->scsi.phase = PHASE_MSGIN;
return;
/* Reselmsgin -> Message In */
case STATE(STAT_MESGIN, PHASE_RECONNECTED):
case STATE(STAT_MESGIN, PHASE_MSGIN):
info->scsi.msgin_fifo = inb(REG_CFIS(info)) & CFIS_CF;
outb(CMD_TRANSFERINFO, REG_CMD(info));
return;
/* Reselmsgin -> Command */
case STATE(STAT_COMMAND, PHASE_RECONNECTED):
fas216_finish_reconnect(info);
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;
/* 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));
outb(CMD_SETATN, REG_CMD(info));
outb(15, REG_STCL(info));
outb(0, REG_STCM(info));
outb(0, REG_STCH(info));
outb(CMD_PADBYTES | CMD_WITHDMA, REG_CMD(info));
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
return;
/* Selection -> Message Out */
case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
case STATE(STAT_MESGOUT, PHASE_MSGOUT): /* Message Out -> Message Out */
/* If we get another message out phase, this
* usually means some parity error occurred.
* Resend complete set of messages. If we have
* more than 1 byte to send, we need to assert
* ATN again.
*/
if (msgqueue_msglength(&info->scsi.msgs) > 1)
outb(CMD_SETATN, REG_CMD(info));
fas216_send_messageout(info, 0);
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);
outb(CMD_SETATN, REG_CMD(info));
msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
info->scsi.aborting = 1;
outb(CMD_TRANSFERINFO, REG_CMD(info));
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:
printk("scsi%d.%c: bus service at step %d?\n",
info->host->host_no, fas216_target(info),
ssr & IS_BITS);
print_debug_list();
fas216_done(info, DID_ERROR);
}
/* Function: void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int ssr)
* Purpose : handle a function done interrupt from FAS216 chip
* Params : info - interface which caused function done interrupt
* stat - Status register contents
* ssr - SCSI Status register contents
*/
static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int ssr)
{
int status, message;
fas216_checkmagic(info);
#ifdef DEBUG_FUNCTIONDONE
printk("scsi%d.%c: function done: stat=%X ssr=%X phase=%02X\n",
info->host->host_no, fas216_target(info), stat, ssr, info->scsi.phase);
#endif
switch (info->scsi.phase) {
case PHASE_STATUS: /* status phase - read status and msg */
status = inb(REG_FF(info));
message = inb(REG_FF(info));
info->scsi.SCp.Message = message;
info->scsi.SCp.Status = status;
info->scsi.phase = PHASE_DONE;
outb(CMD_MSGACCEPTED, REG_CMD(info));
break;
case PHASE_IDLE: /* reselected? */
case PHASE_MSGIN: /* message in phase */
case PHASE_RECONNECTED: /* reconnected command */
if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
info->scsi.msgin_fifo = inb(REG_CFIS(info)) & CFIS_CF;
fas216_message(info);
break;
}
default:
printk("scsi%d.%c: internal phase %s for function done?"
" What do I do with this?\n",
info->host->host_no, fas216_target(info),
fas216_drv_phase(info));
}
}
/* Function: void fas216_intr(struct Scsi_Host *instance)
* Purpose : handle interrupts from the interface to progress a command
* Params : instance - interface to service
*/
void fas216_intr(struct Scsi_Host *instance)
{
FAS216_Info *info = (FAS216_Info *)instance->hostdata;
unsigned char isr, ssr, stat;
fas216_checkmagic(info);
stat = inb(REG_STAT(info));
ssr = inb(REG_IS(info));
isr = inb(REG_INST(info));
add_debug_list(stat, ssr, isr, info->scsi.phase);
if (stat & STAT_INT) {
if (isr & INST_BUSRESET) {
printk(KERN_DEBUG "scsi%d.H: bus reset detected\n", instance->host_no);
scsi_report_bus_reset(instance, 0);
} else if (isr & INST_ILLEGALCMD) {
printk(KERN_CRIT "scsi%d.H: illegal command given\n", instance->host_no);
fas216_dumpstate(info);
} else if (isr & INST_DISCONNECT)
fas216_disconnect_intr(info);
else if (isr & INST_RESELECTED) /* reselected */
fas216_reselected_intr(info);
else if (isr & INST_BUSSERVICE) /* bus service request */
fas216_busservice_intr(info, stat, ssr);
else if (isr & INST_FUNCDONE) /* function done */
fas216_funcdone_intr(info, stat, ssr);
else
printk("scsi%d.%c: unknown interrupt received:"
" phase %s isr %02X ssr %02X stat %02X\n",
instance->host_no, fas216_target(info),
fas216_drv_phase(info), isr, ssr, stat);
}
}
/* Function: void fas216_kick(FAS216_Info *info)
* Purpose : kick a command to the interface - interface should be idle
* Params : info - our host interface to kick
* Notes : Interrupts are always disabled!
*/
static void fas216_kick(FAS216_Info *info)
{
Scsi_Cmnd *SCpnt = NULL;
int tot_msglen, from_queue = 0, disconnect_ok;
fas216_checkmagic(info);
/*
* Obtain the next command to process.
*/
do {
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);
from_queue = 1;
break;
}
} while (0);
if (!SCpnt) /* no command pending - just exit */
return;
if (info->scsi.disconnectable && info->SCpnt) {
queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
info->scsi.disconnectable = 0;
info->SCpnt = NULL;
printk("scsi%d.%c: moved command to disconnected queue\n",
info->host->host_no, fas216_target(info));
}
/*
* claim host busy
*/
info->scsi.phase = PHASE_SELECTION;
info->SCpnt = SCpnt;
info->scsi.SCp = SCpnt->SCp;
info->dma.transfer_type = fasdma_none;
#ifdef DEBUG_CONNECT
printk("scsi%d.%c: starting cmd %02X",
info->host->host_no, '0' + SCpnt->target,
SCpnt->cmnd[0]);
#endif
if (from_queue) {
#ifdef SCSI2_TAG
/*
* tagged queuing - allocate a new tag to this command
*/
if (SCpnt->device->tagged_queue && 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->target * 8 + SCpnt->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;
}
}
/*
* Don't allow request sense commands to disconnect.
*/
disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
info->device[SCpnt->target].disconnect_ok;
/*
* build outgoing message bytes
*/
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->lun));
/*
* add tag message if required
*/
if (SCpnt->tag)
msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
do {
#ifdef SCSI2_WIDE
if (info->device[SCpnt->target].wide_state == neg_wait) {
info->device[SCpnt->target].wide_state = neg_inprogress;
msgqueue_addmsg(&info->scsi.msgs, 4,
EXTENDED_MESSAGE, 2, EXTENDED_WDTR,
info->ifcfg.wide_max_size);
break;
}
#endif
#ifdef SCSI2_SYNC
if ((info->device[SCpnt->target].sync_state == neg_wait ||
info->device[SCpnt->target].sync_state == neg_complete) &&
(SCpnt->cmnd[0] == REQUEST_SENSE ||
SCpnt->cmnd[0] == INQUIRY)) {
info->device[SCpnt->target].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);
/* following what the ESP driver says */
outb(0, REG_STCL(info));
outb(0, REG_STCM(info));
outb(0, REG_STCH(info));
outb(CMD_NOP | CMD_WITHDMA, REG_CMD(info));
/* flush FIFO */
outb(CMD_FLUSHFIFO, REG_CMD(info));
/* load bus-id and timeout */
outb(BUSID(SCpnt->target), REG_SDID(info));
outb(info->ifcfg.select_timeout, REG_STIM(info));
/* synchronous transfers */
fas216_set_sync(info, SCpnt->target);
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->target);
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++)
outb(msg->msg[i], REG_FF(info));
msg->fifo = tot_msglen - (inb(REG_CFIS(info)) & CFIS_CF);
}
/* load command */
for (i = 0; i < SCpnt->cmd_len; i++)
outb(SCpnt->cmnd[i], REG_FF(info));
if (tot_msglen == 1)
outb(CMD_SELECTATN, REG_CMD(info));
else
outb(CMD_SELECTATN3, REG_CMD(info));
} 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);
outb(msg->msg[0], REG_FF(info));
msg->fifo = 1;
outb(CMD_SELECTATNSTOP, REG_CMD(info));
}
#ifdef DEBUG_CONNECT
printk(", data pointers [%p, %X]\n",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
#endif
/* should now get either DISCONNECT or (FUNCTION DONE with BUS SERVICE) intr */
}
/* Function: void fas216_rq_sns_done(info, SCpnt, result)
* Purpose : Finish processing automatic request sense command
* Params : info - interface that completed
* SCpnt - command that completed
* result - driver byte of result
*/
static void
fas216_rq_sns_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
{
#ifdef DEBUG_CONNECT
printk("scsi%d.%c: request sense complete, result=%04X%02X%02X\n",
info->host->host_no, '0' + SCpnt->target, result,
SCpnt->SCp.Message, SCpnt->SCp.Status);
#endif
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));
/*
* 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.
*/
SCpnt->scsi_done(SCpnt);
}
/* Function: void fas216_std_done(info, SCpnt, result)
* Purpose : Finish processing of standard command
* Params : info - interface that completed
* SCpnt - command that completed
* result - driver byte of result
*/
static void
fas216_std_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
{
info->stats.fins += 1;
SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
info->scsi.SCp.Status;
#ifdef DEBUG_CONNECT
printk("scsi%d.%c: command complete, result=%08X, command=",
info->host->host_no, '0' + SCpnt->target, SCpnt->result);
print_command(SCpnt->cmnd);
#endif
/*
* If the driver detected an error, or the command
* was request sense, then we're all done.
*/
if (result != DID_OK || SCpnt->cmnd[0] == REQUEST_SENSE)
goto done;
/*
* If the command returned CHECK_CONDITION status,
* request the sense information.
*/
if (info->scsi.SCp.Status == CHECK_CONDITION)
goto request_sense;
/*
* If the command did not complete with GOOD status,
* we are all done here.
*/
if (info->scsi.SCp.Status != 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 READ_CAPACITY:
case MODE_SENSE:
break;
default:
printk(KERN_ERR "scsi%d.%c: incomplete data transfer "
"detected: res=%08X ptr=%p len=%X command=",
info->host->host_no, '0' + SCpnt->target,
SCpnt->result, info->scsi.SCp.ptr,
info->scsi.SCp.this_residual);
print_command(SCpnt->cmnd);
}
}
done: SCpnt->scsi_done(SCpnt);
return;
request_sense:
memset(SCpnt->cmnd, 0, sizeof (SCpnt->cmnd));
SCpnt->cmnd[0] = REQUEST_SENSE;
SCpnt->cmnd[1] = SCpnt->lun << 5;
SCpnt->cmnd[4] = sizeof(SCpnt->sense_buffer);
SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]);
SCpnt->SCp.buffer = NULL;
SCpnt->SCp.buffers_residual = 0;
SCpnt->SCp.ptr = (char *)SCpnt->sense_buffer;
SCpnt->SCp.this_residual = sizeof(SCpnt->sense_buffer);
SCpnt->SCp.Message = 0;
SCpnt->SCp.Status = 0;
SCpnt->sc_data_direction = SCSI_DATA_READ;
SCpnt->use_sg = 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->target);
info->reqSCpnt = SCpnt;
}
/* Function: void fas216_done(FAS216_Info *info, unsigned int result)
* Purpose : complete processing for current command
* Params : info - interface that completed
* result - driver byte of result
*/
static void fas216_done(FAS216_Info *info, unsigned int result)
{
void (*fn)(FAS216_Info *, Scsi_Cmnd *, unsigned int);
Scsi_Cmnd *SCpnt;
fas216_checkmagic(info);
if (!info->SCpnt)
goto no_command;
SCpnt = info->SCpnt;
info->SCpnt = NULL;
info->scsi.phase = PHASE_IDLE;
if (!SCpnt->scsi_done)
goto no_done;
if (info->scsi.aborting) {
printk("scsi%d.%c: uncaught abort - returning DID_ABORT\n",
info->host->host_no, fas216_target(info));
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 command=",
info->host->host_no, '0' + SCpnt->target,
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
info->scsi.SCp.ptr = NULL;
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.
*/
clear_bit(SCpnt->target * 8 + SCpnt->lun, info->busyluns);
fn = (void (*)(FAS216_Info *, Scsi_Cmnd *, unsigned int))SCpnt->host_scribble;
fn(info, SCpnt, result);
if (info->scsi.irq != NO_IRQ)
fas216_kick(info);
return;
no_command:
panic("scsi%d.H: null command in fas216_done",
info->host->host_no);
no_done:
panic("scsi%d.H: null scsi_done function in fas216_done",
info->host->host_no);
}
/* Function: int fas216_queue_command(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
* Purpose : queue a command for adapter to process.
* Params : SCpnt - Command to queue
* done - done function to call once command is complete
* Returns : 0 - success, else error
* Notes : io_request_lock is held, interrupts are disabled.
*/
int fas216_queue_command(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
{
FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;
int result;
fas216_checkmagic(info);
#ifdef DEBUG_CONNECT
printk("scsi%d.%c: received queuable command (%p) %02X\n",
SCpnt->host->host_no, '0' + SCpnt->target,
SCpnt, SCpnt->cmnd[0]);
#endif
SCpnt->scsi_done = done;
SCpnt->host_scribble = (void *)fas216_std_done;
SCpnt->result = 0;
SCpnt->SCp.Message = 0;
SCpnt->SCp.Status = 0;
if (SCpnt->use_sg) {
unsigned long len = 0;
int buf;
SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer;
SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;
SCpnt->SCp.ptr = (char *) SCpnt->SCp.buffer->address;
SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
/*
* Calculate correct buffer length. Some commands
* come in with the wrong request_bufflen.
*/
for (buf = 0; buf <= SCpnt->SCp.buffers_residual; buf++)
len += SCpnt->SCp.buffer[buf].length;
if (SCpnt->request_bufflen != len)
printk(KERN_WARNING "scsi%d.%c: bad request buffer "
"length %d, should be %ld\n", info->host->host_no,
'0' + SCpnt->target, SCpnt->request_bufflen, len);
SCpnt->request_bufflen = len;
} else {
SCpnt->SCp.buffer = NULL;
SCpnt->SCp.buffers_residual = 0;
SCpnt->SCp.ptr = (unsigned char *)SCpnt->request_buffer;
SCpnt->SCp.this_residual = SCpnt->request_bufflen;
}
/*
* If the upper SCSI layers pass a buffer, but zero length,
* we aren't interested in the buffer pointer.
*/
if (SCpnt->SCp.this_residual == 0 && SCpnt->SCp.ptr) {
#if 0
printk(KERN_WARNING "scsi%d.%c: zero length buffer passed for "
"command ", info->host->host_no, '0' + SCpnt->target);
print_command(SCpnt->cmnd);
#endif
SCpnt->SCp.ptr = NULL;
}
info->stats.queues += 1;
SCpnt->tag = 0;
/*
* 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->SCpnt || info->scsi.disconnectable))
fas216_kick(info);
return result;
}
/* Function: void fas216_internal_done(Scsi_Cmnd *SCpnt)
* Purpose : trigger restart of a waiting thread in fas216_command
* Params : SCpnt - Command to wake
*/
static void fas216_internal_done(Scsi_Cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;
fas216_checkmagic(info);
info->internal_done = 1;
}
/* Function: int fas216_command(Scsi_Cmnd *SCpnt)
* Purpose : queue a command for adapter to process.
* Params : SCpnt - Command to queue
* Returns : scsi result code
* Notes : io_request_lock is held, interrupts are disabled.
*/
int fas216_command(Scsi_Cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->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.
*/
if (info->scsi.irq != NO_IRQ)
BUG();
info->internal_done = 0;
fas216_queue_command(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(&io_request_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 (inb(REG_STAT(info)) & STAT_INT) {
spin_lock_irq(&io_request_lock);
fas216_intr(info->host);
spin_unlock_irq(&io_request_lock);
}
}
spin_lock_irq(&io_request_lock);
return SCpnt->result;
}
enum res_abort {
res_failed, /* unable to abort */
res_success, /* command on issue queue */
res_success_clear, /* command marked tgt/lun busy */
res_hw_abort /* command on disconnected dev */
};
/*
* Prototype: enum res_abort fas216_do_abort(FAS216_Info *info, Scsi_Cmnd *SCpnt)
* Purpose : decide how to abort a command
* Params : SCpnt - command to abort
* Returns : abort status
*/
static enum res_abort
fas216_do_abort(FAS216_Info *info, Scsi_Cmnd *SCpnt)
{
enum res_abort 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;
printk("waiting for execution ");
res = res_success_clear;
} else
printk("unknown ");
return res;
}
/* Function: int fas216_eh_abort(Scsi_Cmnd *SCpnt)
* Purpose : abort this command
* Params : SCpnt - command to abort
* Returns : FAILED if unable to abort
* Notes : io_request_lock is taken, and irqs are disabled
*/
int fas216_eh_abort(Scsi_Cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;
int result = FAILED;
fas216_checkmagic(info);
info->stats.aborts += 1;
print_debug_list();
fas216_dumpstate(info);
fas216_dumpinfo(info);
printk(KERN_WARNING "scsi%d: abort ", info->host->host_no);
switch (fas216_do_abort(info, SCpnt)) {
/*
* We managed to find the command and cleared it out.
* We do not expect the command to be executing on the
* target, but we have set the busylun bit.
*/
case res_success_clear:
printk("clear ");
clear_bit(SCpnt->target * 8 + SCpnt->lun, info->busyluns);
/*
* 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;
}
/* Function: void fas216_reset_state(FAS216_Info *info)
* Purpose : Initialise driver internal state
* Params : info - state to initialise
*/
static void fas216_reset_state(FAS216_Info *info)
{
neg_t sync_state, wide_state;
int i;
fas216_checkmagic(info);
/*
* Clear out all stale info in our state structure
*/
memset(info->busyluns, 0, sizeof(info->busyluns));
msgqueue_flush(&info->scsi.msgs);
info->scsi.reconnected.target = 0;
info->scsi.reconnected.lun = 0;
info->scsi.reconnected.tag = 0;
info->scsi.disconnectable = 0;
info->scsi.aborting = 0;
info->scsi.phase = PHASE_IDLE;
info->scsi.async_stp =
fas216_syncperiod(info, info->ifcfg.asyncperiod);
if (info->ifcfg.wide_max_size == 0)
wide_state = neg_invalid;
else
#ifdef SCSI2_WIDE
wide_state = neg_wait;
#else
wide_state = neg_invalid;
#endif
if (info->host->dma_channel == NO_DMA || !info->dma.setup)
sync_state = neg_invalid;
else
#ifdef SCSI2_SYNC
sync_state = neg_wait;
#else
sync_state = neg_invalid;
#endif
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].wide_state = wide_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;
}
/*
* Drain all commands on disconnected queue
*/
while (queue_remove(&info->queues.disconnected) != NULL);
/*
* Remove executing commands.
*/
info->SCpnt = NULL;
info->reqSCpnt = NULL;
info->origSCpnt = NULL;
}
/* Function: int fas216_eh_device_reset(Scsi_Cmnd *SCpnt)
* Purpose : Reset the device associated with this command
* Params : SCpnt - command specifing device to reset
* Returns : FAILED if unable to reset
*/
int fas216_eh_device_reset(Scsi_Cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;
printk("scsi%d.%c: "__FUNCTION__": called\n",
info->host->host_no, '0' + SCpnt->target);
return FAILED;
}
/* Function: int fas216_eh_bus_reset(Scsi_Cmnd *SCpnt)
* Purpose : Reset the bus associated with the command
* Params : SCpnt - command specifing bus to reset
* Returns : FAILED if unable to reset
* Notes : io_request_lock is taken, and irqs are disabled
*/
int fas216_eh_bus_reset(Scsi_Cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;
int result = FAILED;
fas216_checkmagic(info);
info->stats.bus_resets += 1;
printk("scsi%d.%c: "__FUNCTION__": resetting bus\n",
info->host->host_no, '0' + SCpnt->target);
/*
* Attempt to stop all activity on this interface.
*/
outb(info->scsi.cfg[2], REG_CNTL3(info));
fas216_stoptransfer(info);
/*
* Clear any pending interrupts
*/
while (inb(REG_STAT(info)) & STAT_INT)
inb(REG_INST(info));
/*
* Reset the SCSI bus
*/
outb(CMD_RESETSCSI, REG_CMD(info));
udelay(5);
/*
* Clear reset interrupt
*/
if (inb(REG_STAT(info)) & STAT_INT &&
inb(REG_INST(info)) & INST_BUSRESET)
result = SUCCESS;
fas216_reset_state(info);
return result;
}
/* Function: void fas216_init_chip(FAS216_Info *info)
* Purpose : Initialise FAS216 state after reset
* Params : info - state structure for interface
*/
static void fas216_init_chip(FAS216_Info *info)
{
outb(fas216_clockrate(info->ifcfg.clockrate), REG_CLKF(info));
outb(info->scsi.cfg[0], REG_CNTL1(info));
outb(info->scsi.cfg[1], REG_CNTL2(info));
outb(info->scsi.cfg[2], REG_CNTL3(info));
outb(info->ifcfg.select_timeout, REG_STIM(info));
outb(0, REG_SOF(info));
outb(info->scsi.async_stp, REG_STP(info));
outb(info->scsi.cfg[0], REG_CNTL1(info));
}
/* Function: int fas216_eh_host_reset(Scsi_Cmnd *SCpnt)
* Purpose : Reset the host associated with this command
* Params : SCpnt - command specifing host to reset
* Returns : FAILED if unable to reset
* Notes : io_request_lock is taken, and irqs are disabled
*/
int fas216_eh_host_reset(Scsi_Cmnd *SCpnt)
{
FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;
fas216_checkmagic(info);
printk("scsi%d.%c: "__FUNCTION__": resetting host\n",
info->host->host_no, '0' + SCpnt->target);
/*
* Reset the SCSI chip.
*/
outb(CMD_RESETCHIP, REG_CMD(info));
/*
* Ugly ugly ugly!
* We need to release the io_request_lock and enable
* IRQs if we sleep, but we must relock and disable
* IRQs after the sleep.
*/
spin_unlock_irq(&io_request_lock);
scsi_sleep(25*HZ/100);
spin_lock_irq(&io_request_lock);
/*
* Release the SCSI reset.
*/
outb(CMD_NOP, REG_CMD(info));
fas216_init_chip(info);
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.
*/
outb(CMD_RESETCHIP, REG_CMD(info));
udelay(50);
outb(CMD_NOP, REG_CMD(info));
/*
* Check to see if control reg 2 is present.
*/
outb(0, REG_CNTL3(info));
outb(CNTL2_S2FE, REG_CNTL2(info));
/*
* If we are unable to read back control reg 2
* correctly, it is not present, and we have a
* NCR53C90.
*/
if ((inb(REG_CNTL2(info)) & (~0xe0)) != CNTL2_S2FE)
return TYPE_NCR53C90;
/*
* Now, check control register 3
*/
outb(0, REG_CNTL2(info));
outb(0, REG_CNTL3(info));
outb(5, REG_CNTL3(info));
/*
* If we are unable to read the register back
* correctly, we have a NCR53C90A
*/
if (inb(REG_CNTL3(info)) != 5)
return TYPE_NCR53C90A;
/*
* Now read the ID from the chip.
*/
outb(0, REG_CNTL3(info));
outb(CNTL3_ADIDCHK, REG_CNTL3(info));
outb(0, REG_CNTL3(info));
outb(CMD_RESETCHIP, REG_CMD(info));
udelay(5);
outb(CMD_WITHDMA | CMD_NOP, REG_CMD(info));
outb(CNTL2_ENF, REG_CNTL2(info));
outb(CMD_RESETCHIP, REG_CMD(info));
udelay(5);
outb(CMD_NOP, REG_CMD(info));
rev = inb(REG1_ID(info));
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;
}
/* Function: int fas216_init(struct Scsi_Host *instance)
* Purpose : initialise FAS/NCR/AMD SCSI ic.
* Params : instance - a driver-specific filled-out structure
* Returns : 0 on success
*/
int fas216_init(struct Scsi_Host *instance)
{
FAS216_Info *info = (FAS216_Info *)instance->hostdata;
int type;
info->magic_start = MAGIC;
info->magic_end = MAGIC;
info->host = instance;
info->scsi.cfg[0] = instance->this_id;
info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE;
info->scsi.cfg[2] = info->ifcfg.cntl3 | CNTL3_ADIDCHK | CNTL3_G2CB;
memset(&info->stats, 0, sizeof(info->stats));
msgqueue_initialise(&info->scsi.msgs);
if (!queue_initialise(&info->queues.issue))
return 1;
if (!queue_initialise(&info->queues.disconnected)) {
queue_free(&info->queues.issue);
return 1;
}
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.
*/
outb(info->scsi.cfg[0] | CNTL1_DISR, REG_CNTL1(info));
outb(CMD_RESETSCSI, REG_CMD(info));
/*
* scsi standard says wait 250ms
*/
spin_unlock_irq(&io_request_lock);
scsi_sleep(25*HZ/100);
spin_lock_irq(&io_request_lock);
outb(info->scsi.cfg[0], REG_CNTL1(info));
inb(REG_INST(info));
fas216_checkmagic(info);
return 0;
}
/* Function: int fas216_release(struct Scsi_Host *instance)
* Purpose : release all resources and put everything to bed for
* FAS/NCR/AMD SCSI ic.
* Params : instance - a driver-specific filled-out structure
* Returns : 0 on success
*/
int fas216_release(struct Scsi_Host *instance)
{
FAS216_Info *info = (FAS216_Info *)instance->hostdata;
fas216_checkmagic(info);
outb(CMD_RESETCHIP, REG_CMD(info));
queue_free(&info->queues.disconnected);
queue_free(&info->queues.issue);
return 0;
}
/*
* Function: int fas216_info(FAS216_Info *info, char *buffer)
* Purpose : generate a string containing information about this
* host.
* Params : info - FAS216 host information
* buffer - string buffer to build string
* Returns : size of built string
*/
int fas216_info(FAS216_Info *info, char *buffer)
{
char *p = buffer;
p += sprintf(p, "(%s) at port 0x%08lX ",
info->scsi.type, info->host->io_port);
if (info->host->irq != NO_IRQ)
p += sprintf(p, "irq %d ", info->host->irq);
else
p += sprintf(p, "no irq ");
if (info->host->dma_channel != NO_DMA)
p += sprintf(p, "dma %d ", info->host->dma_channel);
else
p += sprintf(p, "no dma ");
return p - buffer;
}
int fas216_print_host(FAS216_Info *info, char *buffer)
{
return sprintf(buffer,
"\n"
"Chip : %s\n"
" Address: 0x%08lX\n"
" IRQ : %d\n"
" DMA : %d\n",
info->scsi.type, info->host->io_port,
info->host->irq, info->host->dma_channel);
}
int fas216_print_stats(FAS216_Info *info, char *buffer)
{
return sprintf(buffer,
"\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);
}
int fas216_print_device(FAS216_Info *info, Scsi_Device *scd, char *buffer)
{
struct fas216_device *dev = &info->device[scd->id];
int len = 0;
char *p;
proc_print_scsidevice(scd, buffer, &len, 0);
p = buffer + len;
p += sprintf(p, " Extensions: ");
if (scd->tagged_supported)
p += sprintf(p, "TAG %sabled [%d] ",
scd->tagged_queue ? "en" : "dis",
scd->current_tag);
p += sprintf(p, "\n Transfers : %d-bit ",
8 << dev->wide_xfer);
if (dev->sof)
p += sprintf(p, "sync offset %d, %d ns\n",
dev->sof, dev->period * 4);
else
p += sprintf(p, "async\n");
return p - buffer;
}
EXPORT_SYMBOL(fas216_info);
EXPORT_SYMBOL(fas216_init);
EXPORT_SYMBOL(fas216_queue_command);
EXPORT_SYMBOL(fas216_command);
EXPORT_SYMBOL(fas216_intr);
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_device);
MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
MODULE_LICENSE("GPL");
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