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fas216.c
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fas216.c
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/*
* linux/drivers/acorn/scsi/fas216.c
*
* Copyright (C) 1997-2003 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
* other sources, including:
* the AMD Am53CF94 data sheet
* the AMD Am53C94 data sheet
*
* This is a generic driver. To use it, have a look at cumana_2.c. You
* should define your own structure that overlays FAS216_Info, eg:
* struct my_host_data {
* FAS216_Info info;
* ... my host specific data ...
* };
*
* Changelog:
* 30-08-1997 RMK Created
* 14-09-1997 RMK Started disconnect support
* 08-02-1998 RMK Corrected real DMA support
* 15-02-1998 RMK Started sync xfer support
* 06-04-1998 RMK Tightened conditions for printing incomplete
* transfers
* 02-05-1998 RMK Added extra checks in fas216_reset
* 24-05-1998 RMK Fixed synchronous transfers with period >= 200ns
* 27-06-1998 RMK Changed asm/delay.h to linux/delay.h
* 26-08-1998 RMK Improved message support wrt MESSAGE_REJECT
* 02-04-2000 RMK Converted to use the new error handling, and
* automatically request sense data upon check
* condition status from targets.
*/
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/ecard.h>
#include "../scsi.h"
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_host.h>
#include "fas216.h"
#include "scsi.h"
/* NOTE: SCSI2 Synchronous transfers *require* DMA according to
* the data sheet. This restriction is crazy, especially when
* you only want to send 16 bytes! What were the guys who
* designed this chip on at that time? Did they read the SCSI2
* spec at all? The following sections are taken from the SCSI2
* standard (s2r10) concerning this:
*
* > IMPLEMENTORS NOTES:
* > (1) Re-negotiation at every selection is not recommended, since a
* > significant performance impact is likely.
*
* > The implied synchronous agreement shall remain in effect until a BUS DEVICE
* > RESET message is received, until a hard reset condition occurs, or until one
* > of the two SCSI devices elects to modify the agreement. The default data
* > transfer mode is asynchronous data transfer mode. The default data transfer
* > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
* > reset condition.
*
* In total, this means that once you have elected to use synchronous
* transfers, you must always use DMA.
*
* I was thinking that this was a good chip until I found this restriction ;(
*/
#define SCSI2_SYNC
#undef SCSI2_TAG
#undef DEBUG_CONNECT
#undef DEBUG_MESSAGES
#undef CHECK_STRUCTURE
#define LOG_CONNECT (1 << 0)
#define LOG_BUSSERVICE (1 << 1)
#define LOG_FUNCTIONDONE (1 << 2)
#define LOG_MESSAGES (1 << 3)
#define LOG_BUFFER (1 << 4)
#define LOG_ERROR (1 << 8)
static int level_mask = LOG_ERROR;
module_param(level_mask, int, 0644);
static int __init fas216_log_setup(char *str)
{
char *s;
level_mask = 0;
while ((s = strsep(&str, ",")) != NULL) {
switch (s[0]) {
case 'a':
if (strcmp(s, "all") == 0)
level_mask |= -1;
break;
case 'b':
if (strncmp(s, "bus", 3) == 0)
level_mask |= LOG_BUSSERVICE;
if (strncmp(s, "buf", 3) == 0)
level_mask |= LOG_BUFFER;
break;
case 'c':
level_mask |= LOG_CONNECT;
break;
case 'e':
level_mask |= LOG_ERROR;
break;
case 'm':
level_mask |= LOG_MESSAGES;
break;
case 'n':
if (strcmp(s, "none") == 0)
level_mask = 0;
break;
case 's':
level_mask |= LOG_FUNCTIONDONE;
break;
}
}
return 1;
}
__setup("fas216_logging=", fas216_log_setup);
static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
{
unsigned int off = reg << info->scsi.io_shift;
return readb(info->scsi.io_base + off);
}
static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
{
unsigned int off = reg << info->scsi.io_shift;
writeb(val, info->scsi.io_base + off);
}
static void fas216_dumpstate(FAS216_Info *info)
{
unsigned char is, stat, inst;
is = fas216_readb(info, REG_IS);
stat = fas216_readb(info, REG_STAT);
inst = fas216_readb(info, REG_INST);
printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
" INST=%02X IS=%02X CFIS=%02X",
fas216_readb(info, REG_CTCL),
fas216_readb(info, REG_CTCM),
fas216_readb(info, REG_CMD), stat, inst, is,
fas216_readb(info, REG_CFIS));
printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
fas216_readb(info, REG_CNTL1),
fas216_readb(info, REG_CNTL2),
fas216_readb(info, REG_CNTL3),
fas216_readb(info, REG_CTCH));
}
static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
{
printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
SCp->buffers_residual, suffix);
}
static void fas216_dumpinfo(FAS216_Info *info)
{
static int used = 0;
int i;
if (used++)
return;
printk("FAS216_Info=\n");
printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
info->magic_start, info->host, info->SCpnt,
info->origSCpnt);
printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
info->scsi.io_shift, info->scsi.irq,
info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
info->scsi.cfg[3]);
printk(" type=%p phase=%X\n",
info->scsi.type, info->scsi.phase);
print_SCp(&info->scsi.SCp, " SCp={ ", " }\n");
printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n",
info->scsi.async_stp,
info->scsi.disconnectable, info->scsi.aborting);
printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
" disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
info->stats.queues, info->stats.removes, info->stats.fins,
info->stats.reads, info->stats.writes, info->stats.miscs,
info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
info->stats.host_resets);
printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
info->ifcfg.clockrate, info->ifcfg.select_timeout,
info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
for (i = 0; i < 8; i++) {
printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
i, info->busyluns[i], i,
info->device[i].disconnect_ok, info->device[i].stp,
info->device[i].sof, info->device[i].sync_state);
}
printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
info->dma.transfer_type, info->dma.setup,
info->dma.pseudo, info->dma.stop);
printk(" internal_done=%X magic_end=%lX }\n",
info->internal_done, info->magic_end);
}
#ifdef CHECK_STRUCTURE
static void __fas216_checkmagic(FAS216_Info *info, const char *func)
{
int corruption = 0;
if (info->magic_start != MAGIC) {
printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
corruption++;
}
if (info->magic_end != MAGIC) {
printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
corruption++;
}
if (corruption) {
fas216_dumpinfo(info);
panic("scsi memory space corrupted in %s", func);
}
}
#define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
#else
#define fas216_checkmagic(info)
#endif
static const char *fas216_bus_phase(int stat)
{
static const char *phases[] = {
"DATA OUT", "DATA IN",
"COMMAND", "STATUS",
"MISC OUT", "MISC IN",
"MESG OUT", "MESG IN"
};
return phases[stat & STAT_BUSMASK];
}
static const char *fas216_drv_phase(FAS216_Info *info)
{
static const char *phases[] = {
[PHASE_IDLE] = "idle",
[PHASE_SELECTION] = "selection",
[PHASE_COMMAND] = "command",
[PHASE_DATAOUT] = "data out",
[PHASE_DATAIN] = "data in",
[PHASE_MSGIN] = "message in",
[PHASE_MSGIN_DISCONNECT]= "disconnect",
[PHASE_MSGOUT_EXPECT] = "expect message out",
[PHASE_MSGOUT] = "message out",
[PHASE_STATUS] = "status",
[PHASE_DONE] = "done",
};
if (info->scsi.phase < ARRAY_SIZE(phases) &&
phases[info->scsi.phase])
return phases[info->scsi.phase];
return "???";
}
static char fas216_target(FAS216_Info *info)
{
if (info->SCpnt)
return '0' + info->SCpnt->device->id;
else
return 'H';
}
static void
fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
{
static char buf[1024];
vsnprintf(buf, sizeof(buf), fmt, ap);
printk("scsi%d.%c: %s", info->host->host_no, target, buf);
}
static void fas216_log_command(FAS216_Info *info, int level,
struct scsi_cmnd *SCpnt, char *fmt, ...)
{
va_list args;
if (level != 0 && !(level & level_mask))
return;
va_start(args, fmt);
fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
va_end(args);
printk(" CDB: ");
__scsi_print_command(SCpnt->cmnd);
}
static void
fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
{
va_list args;
if (level != 0 && !(level & level_mask))
return;
if (target < 0)
target = 'H';
else
target += '0';
va_start(args, fmt);
fas216_do_log(info, target, fmt, args);
va_end(args);
printk("\n");
}
static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
{
va_list args;
if (level != 0 && !(level & level_mask))
return;
va_start(args, fmt);
fas216_do_log(info, fas216_target(info), fmt, args);
va_end(args);
printk("\n");
}
#define PH_SIZE 32
static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
static int ph_ptr;
static void add_debug_list(int stat, int ssr, int isr, int ph)
{
ph_list[ph_ptr].stat = stat;
ph_list[ph_ptr].ssr = ssr;
ph_list[ph_ptr].isr = isr;
ph_list[ph_ptr].ph = ph;
ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
}
static struct { int command; void *from; } cmd_list[8];
static int cmd_ptr;
static void fas216_cmd(FAS216_Info *info, unsigned int command)
{
cmd_list[cmd_ptr].command = command;
cmd_list[cmd_ptr].from = __builtin_return_address(0);
cmd_ptr = (cmd_ptr + 1) & 7;
fas216_writeb(info, REG_CMD, command);
}
static void print_debug_list(void)
{
int i;
i = ph_ptr;
printk(KERN_ERR "SCSI IRQ trail\n");
do {
printk(" %02x:%02x:%02x:%1x",
ph_list[i].stat, ph_list[i].ssr,
ph_list[i].isr, ph_list[i].ph);
i = (i + 1) & (PH_SIZE - 1);
if (((i ^ ph_ptr) & 7) == 0)
printk("\n");
} while (i != ph_ptr);
if ((i ^ ph_ptr) & 7)
printk("\n");
i = cmd_ptr;
printk(KERN_ERR "FAS216 commands: ");
do {
printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
i = (i + 1) & 7;
} while (i != cmd_ptr);
printk("\n");
}
static void fas216_done(FAS216_Info *info, unsigned int result);
/**
* fas216_get_last_msg - retrive last message from the list
* @info: interface to search
* @pos: current fifo position
*
* Retrieve a last message from the list, using position in fifo.
*/
static inline unsigned short
fas216_get_last_msg(FAS216_Info *info, int pos)
{
unsigned short packed_msg = NOP;
struct message *msg;
int msgnr = 0;
while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
if (pos >= msg->fifo)
break;
}
if (msg) {
if (msg->msg[0] == EXTENDED_MESSAGE)
packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
else
packed_msg = msg->msg[0];
}
fas216_log(info, LOG_MESSAGES,
"Message: %04x found at position %02x\n", packed_msg, pos);
return packed_msg;
}
/**
* fas216_syncperiod - calculate STP register value
* @info: state structure for interface connected to device
* @ns: period in ns (between subsequent bytes)
*
* Calculate value to be loaded into the STP register for a given period
* in ns. Returns a value suitable for REG_STP.
*/
static int fas216_syncperiod(FAS216_Info *info, int ns)
{
int value = (info->ifcfg.clockrate * ns) / 1000;
fas216_checkmagic(info);
if (value < 4)
value = 4;
else if (value > 35)
value = 35;
return value & 31;
}
/**
* fas216_set_sync - setup FAS216 chip for specified transfer period.
* @info: state structure for interface connected to device
* @target: target
*
* Correctly setup FAS216 chip for specified transfer period.
* Notes : we need to switch the chip out of FASTSCSI mode if we have
* a transfer period >= 200ns - otherwise the chip will violate
* the SCSI timings.
*/
static void fas216_set_sync(FAS216_Info *info, int target)
{
unsigned int cntl3;
fas216_writeb(info, REG_SOF, info->device[target].sof);
fas216_writeb(info, REG_STP, info->device[target].stp);
cntl3 = info->scsi.cfg[2];
if (info->device[target].period >= (200 / 4))
cntl3 = cntl3 & ~CNTL3_FASTSCSI;
fas216_writeb(info, REG_CNTL3, cntl3);
}
/* Synchronous transfer support
*
* Note: The SCSI II r10 spec says (5.6.12):
*
* (2) Due to historical problems with early host adapters that could
* not accept an SDTR message, some targets may not initiate synchronous
* negotiation after a power cycle as required by this standard. Host
* adapters that support synchronous mode may avoid the ensuing failure
* modes when the target is independently power cycled by initiating a
* synchronous negotiation on each REQUEST SENSE and INQUIRY command.
* This approach increases the SCSI bus overhead and is not recommended
* for new implementations. The correct method is to respond to an
* SDTR message with a MESSAGE REJECT message if the either the
* initiator or target devices does not support synchronous transfers
* or does not want to negotiate for synchronous transfers at the time.
* Using the correct method assures compatibility with wide data
* transfers and future enhancements.
*
* We will always initiate a synchronous transfer negotiation request on
* every INQUIRY or REQUEST SENSE message, unless the target itself has
* at some point performed a synchronous transfer negotiation request, or
* we have synchronous transfers disabled for this device.
*/
/**
* fas216_handlesync - Handle a synchronous transfer message
* @info: state structure for interface
* @msg: message from target
*
* Handle a synchronous transfer message from the target
*/
static void fas216_handlesync(FAS216_Info *info, char *msg)
{
struct fas216_device *dev = &info->device[info->SCpnt->device->id];
enum { sync, async, none, reject } res = none;
#ifdef SCSI2_SYNC
switch (msg[0]) {
case MESSAGE_REJECT:
/* Synchronous transfer request failed.
* Note: SCSI II r10:
*
* SCSI devices that are capable of synchronous
* data transfers shall not respond to an SDTR
* message with a MESSAGE REJECT message.
*
* Hence, if we get this condition, we disable
* negotiation for this device.
*/
if (dev->sync_state == neg_inprogress) {
dev->sync_state = neg_invalid;
res = async;
}
break;
case EXTENDED_MESSAGE:
switch (dev->sync_state) {
/* We don't accept synchronous transfer requests.
* Respond with a MESSAGE_REJECT to prevent a
* synchronous transfer agreement from being reached.
*/
case neg_invalid:
res = reject;
break;
/* We were not negotiating a synchronous transfer,
* but the device sent us a negotiation request.
* Honour the request by sending back a SDTR
* message containing our capability, limited by
* the targets capability.
*/
default:
fas216_cmd(info, CMD_SETATN);
if (msg[4] > info->ifcfg.sync_max_depth)
msg[4] = info->ifcfg.sync_max_depth;
if (msg[3] < 1000 / info->ifcfg.clockrate)
msg[3] = 1000 / info->ifcfg.clockrate;
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 5,
EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
msg[3], msg[4]);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
/* This is wrong. The agreement is not in effect
* until this message is accepted by the device
*/
dev->sync_state = neg_targcomplete;
res = sync;
break;
/* We initiated the synchronous transfer negotiation,
* and have successfully received a response from the
* target. The synchronous transfer agreement has been
* reached. Note: if the values returned are out of our
* bounds, we must reject the message.
*/
case neg_inprogress:
res = reject;
if (msg[4] <= info->ifcfg.sync_max_depth &&
msg[3] >= 1000 / info->ifcfg.clockrate) {
dev->sync_state = neg_complete;
res = sync;
}
break;
}
}
#else
res = reject;
#endif
switch (res) {
case sync:
dev->period = msg[3];
dev->sof = msg[4];
dev->stp = fas216_syncperiod(info, msg[3] * 4);
fas216_set_sync(info, info->SCpnt->device->id);
break;
case reject:
fas216_cmd(info, CMD_SETATN);
msgqueue_flush(&info->scsi.msgs);
msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
info->scsi.phase = PHASE_MSGOUT_EXPECT;
case async:
dev->period = info->ifcfg.asyncperiod / 4;
dev->sof = 0;
dev->stp = info->scsi.async_stp;
fas216_set_sync(info, info->SCpnt->device->id);
break;
case none:
break;
}
}
/**
* fas216_updateptrs - update data pointers after transfer suspended/paused
* @info: interface's local pointer to update
* @bytes_transferred: number of bytes transferred
*
* Update data pointers after transfer suspended/paused
*/
static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
{
struct scsi_pointer *SCp = &info->scsi.SCp;
fas216_checkmagic(info);
BUG_ON(bytes_transferred < 0);
SCp->phase -= bytes_transferred;
while (bytes_transferred != 0) {
if (SCp->this_residual > bytes_transferred)
break;
/*
* We have used up this buffer. Move on to the
* next buffer.
*/
bytes_transferred -= SCp->this_residual;
if (!next_SCp(SCp) && bytes_transferred) {
printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
info->host->host_no, '0' + info->SCpnt->device->id);
return;
}
}
SCp->this_residual -= bytes_transferred;
if (SCp->this_residual)
SCp->ptr += bytes_transferred;
else
SCp->ptr = NULL;
}
/**
* fas216_pio - transfer data off of/on to card using programmed IO
* @info: interface to transfer data to/from
* @direction: direction to transfer data (DMA_OUT/DMA_IN)
*
* Transfer data off of/on to card using programmed IO.
* Notes: this is incredibly slow.
*/
static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
{
struct scsi_pointer *SCp = &info->scsi.SCp;
fas216_checkmagic(info);
if (direction == DMA_OUT)
fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
else
put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
if (SCp->this_residual == 0)
next_SCp(SCp);
}
static void fas216_set_stc(FAS216_Info *info, unsigned int length)
{
fas216_writeb(info, REG_STCL, length);
fas216_writeb(info, REG_STCM, length >> 8);
fas216_writeb(info, REG_STCH, length >> 16);
}
static unsigned int fas216_get_ctc(FAS216_Info *info)
{
return fas216_readb(info, REG_CTCL) +
(fas216_readb(info, REG_CTCM) << 8) +
(fas216_readb(info, REG_CTCH) << 16);
}
/**
* fas216_cleanuptransfer - clean up after a transfer has completed.
* @info: interface to clean up
*
* Update the data pointers according to the number of bytes transferred
* on the SCSI bus.
*/
static void fas216_cleanuptransfer(FAS216_Info *info)
{
unsigned long total, residual, fifo;
fasdmatype_t dmatype = info->dma.transfer_type;
info->dma.transfer_type = fasdma_none;
/*
* PIO transfers do not need to be cleaned up.
*/
if (dmatype == fasdma_pio || dmatype == fasdma_none)
return;
if (dmatype == fasdma_real_all)
total = info->scsi.SCp.phase;
else
total = info->scsi.SCp.this_residual;
residual = fas216_get_ctc(info);
fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
fas216_log(info, LOG_BUFFER, "cleaning up from previous "
"transfer: length 0x%06x, residual 0x%x, fifo %d",
total, residual, fifo);
/*
* If we were performing Data-Out, the transfer counter
* counts down each time a byte is transferred by the
* host to the FIFO. This means we must include the
* bytes left in the FIFO from the transfer counter.
*/
if (info->scsi.phase == PHASE_DATAOUT)
residual += fifo;
fas216_updateptrs(info, total - residual);
}
/**
* fas216_transfer - Perform a DMA/PIO transfer off of/on to card
* @info: interface from which device disconnected from
*
* Start a DMA/PIO transfer off of/on to card
*/
static void fas216_transfer(FAS216_Info *info)
{
fasdmadir_t direction;
fasdmatype_t dmatype;
fas216_log(info, LOG_BUFFER,
"starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
info->scsi.SCp.phase);
if (!info->scsi.SCp.ptr) {
fas216_log(info, LOG_ERROR, "null buffer passed to "
"fas216_starttransfer");
print_SCp(&info->scsi.SCp, "SCp: ", "\n");
print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n");
return;
}
/*
* If we have a synchronous transfer agreement in effect, we must
* use DMA mode. If we are using asynchronous transfers, we may
* use DMA mode or PIO mode.
*/
if (info->device[info->SCpnt->device->id].sof)
dmatype = fasdma_real_all;
else
dmatype = fasdma_pio;
if (info->scsi.phase == PHASE_DATAOUT)
direction = DMA_OUT;
else
direction = DMA_IN;
if (info->dma.setup)
dmatype = info->dma.setup(info->host, &info->scsi.SCp,
direction, dmatype);
info->dma.transfer_type = dmatype;
if (dmatype == fasdma_real_all)
fas216_set_stc(info, info->scsi.SCp.phase);
else
fas216_set_stc(info, info->scsi.SCp.this_residual);
switch (dmatype) {
case fasdma_pio:
fas216_log(info, LOG_BUFFER, "PIO transfer");
fas216_writeb(info, REG_SOF, 0);
fas216_writeb(info, REG_STP, info->scsi.async_stp);
fas216_cmd(info, CMD_TRANSFERINFO);
fas216_pio(info, direction);
break;
case fasdma_pseudo:
fas216_log(info, LOG_BUFFER, "pseudo transfer");
fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
info->dma.pseudo(info->host, &info->scsi.SCp,
direction, info->SCpnt->transfersize);
break;
case fasdma_real_block:
fas216_log(info, LOG_BUFFER, "block dma transfer");
fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
break;
case fasdma_real_all:
fas216_log(info, LOG_BUFFER, "total dma transfer");
fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
break;
default:
fas216_log(info, LOG_BUFFER | LOG_ERROR,
"invalid FAS216 DMA type");
break;
}
}
/**
* fas216_stoptransfer - Stop a DMA transfer onto / off of the card
* @info: interface from which device disconnected from
*
* Called when we switch away from DATA IN or DATA OUT phases.
*/
static void fas216_stoptransfer(FAS216_Info *info)
{
fas216_checkmagic(info);
if (info->dma.transfer_type == fasdma_real_all ||
info->dma.transfer_type == fasdma_real_block)
info->dma.stop(info->host, &info->scsi.SCp);
fas216_cleanuptransfer(info);
if (info->scsi.phase == PHASE_DATAIN) {
unsigned int fifo;
/*
* If we were performing Data-In, then the FIFO counter
* contains the number of bytes not transferred via DMA
* from the on-board FIFO. Read them manually.
*/
fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
while (fifo && info->scsi.SCp.ptr) {
*info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
fas216_updateptrs(info, 1);
fifo--;
}
} else {
/*
* After a Data-Out phase, there may be unsent
* bytes left in the FIFO. Flush them out.
*/
fas216_cmd(info, CMD_FLUSHFIFO);
}
}
static void fas216_aborttransfer(FAS216_Info *info)
{
fas216_checkmagic(info);
if (info->dma.transfer_type == fasdma_real_all ||
info->dma.transfer_type == fasdma_real_block)
info->dma.stop(info->host, &info->scsi.SCp);
info->dma.transfer_type = fasdma_none;
fas216_cmd(info, CMD_FLUSHFIFO);
}
static void fas216_kick(FAS216_Info *info);
/**
* fas216_disconnected_intr - handle device disconnection
* @info: interface from which device disconnected from
*
* Handle device disconnection
*/
static void fas216_disconnect_intr(FAS216_Info *info)
{
unsigned long flags;
fas216_checkmagic(info);
fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
info->scsi.phase);
msgqueue_flush(&info->scsi.msgs);
switch (info->scsi.phase) {
case PHASE_SELECTION: /* while selecting - no target */
case PHASE_SELSTEPS:
fas216_done(info, DID_NO_CONNECT);
break;
case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */
info->scsi.disconnectable = 1;
info->scsi.phase = PHASE_IDLE;
info->stats.disconnects += 1;
spin_lock_irqsave(&info->host_lock, flags);
if (info->scsi.phase == PHASE_IDLE)
fas216_kick(info);
spin_unlock_irqrestore(&info->host_lock, flags);
break;
case PHASE_DONE: /* at end of command - complete */
fas216_done(info, DID_OK);
break;
case PHASE_MSGOUT: /* message out - possible ABORT message */
if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
info->scsi.aborting = 0;
fas216_done(info, DID_ABORT);
break;
}
default: /* huh? */
printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
info->host->host_no, fas216_target(info), fas216_drv_phase(info));
print_debug_list();
fas216_stoptransfer(info);
fas216_done(info, DID_ERROR);
break;
}
}
/**
* fas216_reselected_intr - start reconnection of a device
* @info: interface which was reselected
*
* Start reconnection of a device
*/
static void
fas216_reselected_intr(FAS216_Info *info)
{
unsigned int cfis, i;
unsigned char msg[4];
unsigned char target, lun, tag;
fas216_checkmagic(info);
WARN_ON(info->scsi.phase == PHASE_SELECTION ||
info->scsi.phase == PHASE_SELSTEPS);
cfis = fas216_readb(info, REG_CFIS);
fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
info->scsi.phase, cfis);
cfis &= CFIS_CF;
if (cfis < 2 || cfis > 4) {
printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
info->host->host_no);
goto bad_message;
}
for (i = 0; i < cfis; i++)
msg[i] = fas216_readb(info, REG_FF);
if (!(msg[0] & (1 << info->host->this_id)) ||
!(msg[1] & 0x80))
goto initiator_error;
target = msg[0] & ~(1 << info->host->this_id);
target = ffs(target) - 1;
lun = msg[1] & 7;
tag = 0;
if (cfis >= 3) {
if (msg[2] != SIMPLE_QUEUE_TAG)
goto initiator_error;
tag = msg[3];
}
/* set up for synchronous transfers */
fas216_writeb(info, REG_SDID, target);
fas216_set_sync(info, target);
msgqueue_flush(&info->scsi.msgs);
fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
target, lun, tag);
if (info->scsi.disconnectable && info->SCpnt) {
info->scsi.disconnectable = 0;
if (info->SCpnt->device->id == target &&
info->SCpnt->device->lun == lun &&
info->SCpnt->tag == tag) {
fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
} else {
queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
info->SCpnt = NULL;
}
}