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linux-next/drivers/scsi/arm/fas216.c
Gustavo A. R. Silva fccf01b647 scsi: fas216: Mark expected switch fall-throughs 
Mark switch cases where we are expecting to fall through.

Fix the following warnings (Building: rpc_defconfig arm):

drivers/scsi/arm/fas216.c: In function ‘fas216_disconnect_intr’:
drivers/scsi/arm/fas216.c:913:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
      ^
drivers/scsi/arm/fas216.c:919:2: note: here
  default:    /* huh?     */
  ^~~~~~~
drivers/scsi/arm/fas216.c: In function ‘fas216_kick’:
drivers/scsi/arm/fas216.c:1959:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   fas216_allocate_tag(info, SCpnt);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/arm/fas216.c:1960:2: note: here
  case TYPE_OTHER:
  ^~~~
drivers/scsi/arm/fas216.c: In function ‘fas216_busservice_intr’:
drivers/scsi/arm/fas216.c:1413:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   fas216_stoptransfer(info);
   ^~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/arm/fas216.c:1414:2: note: here
  case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
  ^~~~
drivers/scsi/arm/fas216.c:1424:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   fas216_stoptransfer(info);
   ^~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/arm/fas216.c:1425:2: note: here
  case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */
  ^~~~
drivers/scsi/arm/fas216.c: In function ‘fas216_funcdone_intr’:
drivers/scsi/arm/fas216.c:1573:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
      ^
drivers/scsi/arm/fas216.c:1579:2: note: here
  default:
  ^~~~~~~
drivers/scsi/arm/fas216.c: In function ‘fas216_handlesync’:
drivers/scsi/arm/fas216.c:605:20: warning: this statement may fall through [-Wimplicit-fallthrough=]
   info->scsi.phase = PHASE_MSGOUT_EXPECT;
   ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
drivers/scsi/arm/fas216.c:607:2: note: here
  case async:
  ^~~~

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
2019-08-09 19:53:35 -05:00

3038 lines
77 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/drivers/acorn/scsi/fas216.c
*
* Copyright (C) 1997-2003 Russell King
*
* 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);
#ifndef MODULE
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);
#endif
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);
}
#ifdef CHECK_STRUCTURE
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);
}
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);
scsi_print_command(SCpnt);
}
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;
/* fall through */
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;
}
/* else, fall through */
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);
/* fall through */
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);
/* fall through */
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;
}
/* else, fall through */
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 +
(u8)(SCpnt->device->lun & 0x7), 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);
/* fall through */
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, SCSI_SENSE_BUFFERSIZE);
//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:
scmd_printk(KERN_ERR, SCpnt,
"incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
SCpnt->result, info->scsi.SCp.ptr,
info->scsi.SCp.this_residual);
scsi_print_command(SCpnt);
set_host_byte(SCpnt, DID_ERROR);
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: losing 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) {
scmd_printk(KERN_INFO, SCpnt,
"zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
info->scsi.SCp.ptr = NULL;
scsi_print_command(SCpnt);
}
/*
* 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 +
(u8)(SCpnt->device->lun & 0x7), info->busyluns);
fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
fn(info, SCpnt, result);
if (info->scsi.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);
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 intelligence 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(struct timer_list *t)
{
FAS216_Info *info = from_timer(info, t, eh_timer);
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 +
(u8)(SCpnt->device->lun & 0x7), 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;
scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
print_debug_list();
fas216_dumpstate(info);
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:
scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
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:
scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
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);
fas216_log(info, LOG_ERROR, "resetting host");
/*
* 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);
timer_setup(&info->eh_timer, fas216_eh_timer, 0);
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);
}
void fas216_print_host(FAS216_Info *info, struct seq_file *m)
{
seq_printf(m,
"\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);
}
void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
{
seq_printf(m, "\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);
}
void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
{
struct fas216_device *dev;
struct scsi_device *scd;
seq_puts(m, "Device/Lun TaggedQ Parity Sync\n");
shost_for_each_device(scd, info->host) {
dev = &info->device[scd->id];
seq_printf(m, " %d/%llu ", scd->id, scd->lun);
if (scd->tagged_supported)
seq_printf(m, "%3sabled(%3d) ",
scd->simple_tags ? "en" : "dis",
scd->current_tag);
else
seq_puts(m, "unsupported ");
seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
if (dev->sof)
seq_printf(m, "offset %d, %d ns\n",
dev->sof, dev->period * 4);
else
seq_puts(m, "async\n");
}
}
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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