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aha274x.c
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1995-10-10
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/*
* @(#)aha274x.c 1.25 94/09/06 jda
*
* Adaptec 274x device driver for Linux.
* Copyright (c) 1994 The University of Calgary Department of Computer Science.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Sources include the Adaptec 1740 driver (aha1740.c), the
* Ultrastor 24F driver (ultrastor.c), various Linux kernel
* source, the Adaptec EISA config file (!adp7771.cfg), the
* Adaptec AHA-2740A Series User's Guide, the Linux Kernel
* Hacker's Guide, Writing a SCSI Device Driver for Linux,
* the Adaptec 1542 driver (aha1542.c), the Adaptec EISA
* overlay file (adp7770.ovl), the Adaptec AHA-2740 Series
* Technical Reference Manual, the Adaptec AIC-7770 Data
* Book, the ANSI SCSI specification, the ANSI SCSI-2
* specification (draft 10c), ...
*
* On a twin-bus adapter card, channel B is ignored. Rationale:
* it would greatly complicate the sequencer and host driver code,
* and both busses are multiplexed on to the EISA bus anyway. So
* I don't really see any technical advantage to supporting both.
*
* As well, multiple adapter card using the same IRQ level are
* not supported. It doesn't make sense to configure the cards
* this way from a performance standpoint. Not to mention that
* the kernel would have to support two devices per registered IRQ.
*/
#include <stdarg.h>
#include <asm/io.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include "../block/blk.h"
#include "sd.h"
#include "scsi.h"
#include "hosts.h"
#include "aha274x.h"
/*
* There should be a specific return value for this in scsi.h, but
* it seems that most drivers ignore it.
*/
#define DID_UNDERFLOW DID_ERROR
/* EISA stuff */
#define MINEISA 1
#define MAXEISA 15
#define SLOTBASE(x) ((x) << 12)
#define MAXIRQ 15
/* AIC-7770 offset definitions */
#define O_MINREG(x) ((x) + 0xc00) /* i/o range to reserve */
#define O_MAXREG(x) ((x) + 0xcbf)
#define O_SCSISEQ(x) ((x) + 0xc00) /* scsi sequence control */
#define O_SCSISIGI(x) ((x) + 0xc03) /* scsi control signal read */
#define O_SCSISIGO(x) ((x) + 0xc03) /* scsi control signal write */
#define O_SCSIID(x) ((x) + 0xc05) /* scsi id */
#define O_SSTAT0(x) ((x) + 0xc0b) /* scsi status register 0 */
#define O_CLRSINT1(x) ((x) + 0xc0c) /* clear scsi interrupt 1 */
#define O_SSTAT1(x) ((x) + 0xc0c) /* scsi status register 1 */
#define O_SELID(x) ((x) + 0xc19) /* [re]selection id */
#define O_SBLKCTL(x) ((x) + 0xc1f) /* scsi block control */
#define O_SEQCTL(x) ((x) + 0xc60) /* sequencer control */
#define O_SEQRAM(x) ((x) + 0xc61) /* sequencer ram data */
#define O_SEQADDR(x) ((x) + 0xc62) /* sequencer address (W) */
#define O_BIDx(x) ((x) + 0xc80) /* board id */
#define O_BCTL(x) ((x) + 0xc84) /* board control */
#define O_HCNTRL(x) ((x) + 0xc87) /* host control */
#define O_SCBPTR(x) ((x) + 0xc90) /* scb pointer */
#define O_INTSTAT(x) ((x) + 0xc91) /* interrupt status */
#define O_ERROR(x) ((x) + 0xc92) /* hard error */
#define O_CLRINT(x) ((x) + 0xc92) /* clear interrupt status */
#define O_SCBCNT(x) ((x) + 0xc9a) /* scb auto increment */
#define O_QINFIFO(x) ((x) + 0xc9b) /* queue in fifo */
#define O_QINCNT(x) ((x) + 0xc9c) /* queue in count */
#define O_QOUTFIFO(x) ((x) + 0xc9d) /* queue out fifo */
#define O_QOUTCNT(x) ((x) + 0xc9e) /* queue out count */
#define O_SCBARRAY(x) ((x) + 0xca0) /* scb array start */
/* host adapter offset definitions */
#define HA_REJBYTE(x) ((x) + 0xc31) /* 1st message in byte */
#define HA_MSG_FLAGS(x) ((x) + 0xc35) /* outgoing message flag */
#define HA_MSG_LEN(x) ((x) + 0xc36) /* outgoing message length */
#define HA_MSG_START(x) ((x) + 0xc37) /* outgoing message body */
#define HA_ARG_1(x) ((x) + 0xc4c) /* sdtr <-> rate parameters */
#define HA_ARG_2(x) ((x) + 0xc4d)
#define HA_RETURN_1(x) ((x) + 0xc4c)
#define HA_RETURN_2(x) ((x) + 0xc4d)
#define HA_SIGSTATE(x) ((x) + 0xc4e) /* value in SCSISIGO */
#define HA_NEEDSDTR(x) ((x) + 0xc4f) /* synchronous negotiation? */
#define HA_SCSICONF(x) ((x) + 0xc5a) /* SCSI config register */
#define HA_INTDEF(x) ((x) + 0xc5c) /* interrupt def'n register */
#define HA_HOSTCONF(x) ((x) + 0xc5d) /* host config def'n register */
/* debugging code */
#define AHA274X_DEBUG
/*
* If a parity error occurs during a data transfer phase, run the
* command to completion - it's easier that way - making a note
* of the error condition in this location. This then will modify
* a DID_OK status into a DID_PARITY one for the higher-level SCSI
* code.
*/
#define aha274x_parity(cmd) ((cmd)->SCp.Status)
/*
* Since the sequencer code DMAs the scatter-gather structures
* directly from memory, we use this macro to assert that the
* kernel structure hasn't changed.
*/
#define SG_STRUCT_CHECK(sg) \
((char *)&(sg).address - (char *)&(sg) != 0 || \
(char *)&(sg).length - (char *)&(sg) != 8 || \
sizeof((sg).address) != 4 || \
sizeof((sg).length) != 4 || \
sizeof(sg) != 12)
/*
* "Static" structures. Note that these are NOT initialized
* to zero inside the kernel - we have to initialize them all
* explicitly.
*
* We support a maximum of one adapter card per IRQ level (see the
* rationale for this above). On an interrupt, use the IRQ as an
* index into aha274x_boards[] to locate the card information.
*/
static struct Scsi_Host *aha274x_boards[MAXIRQ + 1];
struct aha274x_host {
int base; /* card base address */
int unpause; /* value for HCNTRL */
volatile Scsi_Cmnd *SCB_array[AHA274X_MAXSCB]; /* active commands */
};
struct aha274x_scb {
unsigned char control;
unsigned char target_channel_lun; /* 4/1/3 bits */
unsigned char SG_segment_count;
unsigned char SG_list_pointer[4];
unsigned char SCSI_cmd_pointer[4];
unsigned char SCSI_cmd_length;
unsigned char RESERVED[2]; /* must be zero */
unsigned char target_status;
unsigned char residual_data_count[3];
unsigned char residual_SG_segment_count;
unsigned char data_pointer[4];
unsigned char data_count[3];
#if 0
/*
* No real point in transferring this to the
* SCB registers.
*/
unsigned char RESERVED[6];
#endif
};
/*
* NB. This table MUST be ordered shortest period first.
*/
static struct {
short period;
short rate;
char *english;
} aha274x_synctab[] = {
100, 0, "10.0",
125, 1, "8.0",
150, 2, "6.67",
175, 3, "5.7",
200, 4, "5.0",
225, 5, "4.4",
250, 6, "4.0",
275, 7, "3.6"
};
static int aha274x_synctab_max =
sizeof(aha274x_synctab) / sizeof(aha274x_synctab[0]);
enum aha_type {
T_NONE,
T_274X,
T_284X,
T_MAX
};
#ifdef AHA274X_DEBUG
extern int vsprintf(char *, const char *, va_list);
static
void debug(const char *fmt, ...)
{
va_list ap;
char buf[256];
va_start(ap, fmt);
vsprintf(buf, fmt, ap);
printk(buf);
va_end(ap);
}
static
void debug_config(enum aha_type type, int base)
{
int ioport2, ioport3, ioport4;
static char *BRT[T_MAX][16] = {
{ }, /* T_NONE */
{
"2", "???", "???", "12", /* T_274X */
"???", "???", "???", "28",
"???", "???", "???", "44",
"???", "???", "???", "60"
},
{
"2", "4", "8", "12", /* T_284X */
"16", "20", "24", "28",
"32", "36", "40", "44",
"48", "52", "56", "60"
}
};
static int DFT[4] = {
0, 50, 75, 100
};
static int SST[4] = {
256, 128, 64, 32
};
ioport2 = inb(HA_HOSTCONF(base));
ioport3 = inb(HA_SCSICONF(base));
ioport4 = inb(HA_INTDEF(base));
if (type == T_284X)
printk("AHA284X AT SLOT %d:\n", base >> 12);
else
printk("AHA274X AT EISA SLOT %d:\n", base >> 12);
printk(" irq %d\n"
" bus release time %s bclks\n"
" data fifo threshold %d%%\n",
ioport4 & 0xf,
BRT[type][(ioport2 >> 2) & 0xf],
DFT[(ioport2 >> 6) & 0x3]);
printk(" SCSI CHANNEL A:\n"
" scsi id %d\n"
" scsi bus parity check %sabled\n"
" scsi selection timeout %d ms\n"
" scsi bus reset at power-on %sabled\n",
ioport3 & 0x7,
(ioport3 & 0x20) ? "en" : "dis",
SST[(ioport3 >> 3) & 0x3],
(ioport3 & 0x40) ? "en" : "dis");
if (type == T_274X) {
printk(" scsi bus termination %sabled\n",
(ioport3 & 0x80) ? "en" : "dis");
}
}
static
void debug_rate(int base, int rate)
{
int target = inb(O_SCSIID(base)) >> 4;
if (rate) {
printk("aha274x: target %d now synchronous at %sMb/s\n",
target,
aha274x_synctab[(rate >> 4) & 0x7].english);
} else {
printk("aha274x: target %d using asynchronous mode\n",
target);
}
}
#else
# define debug(fmt, args...)
# define debug_config(x)
# define debug_rate(x,y)
#endif AHA274X_DEBUG
static
void aha274x_getscb(int base, struct aha274x_scb *scb)
{
/*
* This is almost identical to aha274x_putscb().
*/
outb(0x80, O_SCBCNT(base)); /* SCBAUTO */
asm volatile("cld\n\t"
"rep\n\t"
"insb"
: /* no output */
:"D" (scb), "c" (sizeof(*scb)), "d" (O_SCBARRAY(base))
:"di", "cx", "dx");
outb(0, O_SCBCNT(base));
}
/*
* How much data should be transferred for this SCSI command? Stop
* at segment sg_last if it's a scatter-gather command so we can
* compute underflow easily.
*/
static
unsigned aha274x_length(Scsi_Cmnd *cmd, int sg_last)
{
int i, segments;
unsigned length;
struct scatterlist *sg;
segments = cmd->use_sg - sg_last;
sg = (struct scatterlist *)cmd->buffer;
if (cmd->use_sg) {
for (i = length = 0;
i < cmd->use_sg && i < segments;
i++)
{
length += sg[i].length;
}
} else
length = cmd->request_bufflen;
return(length);
}
static
void aha274x_sg_check(Scsi_Cmnd *cmd)
{
int i;
struct scatterlist *sg = (struct scatterlist *)cmd->buffer;
if (cmd->use_sg) {
for (i = 0; i < cmd->use_sg; i++)
if ((unsigned)sg[i].length > 0xffff)
panic("aha274x_sg_check: s/g segment > 64k\n");
}
}
static
void aha274x_to_scsirate(unsigned char *rate,
unsigned char transfer,
unsigned char offset)
{
int i;
transfer *= 4;
for (i = 0; i < aha274x_synctab_max-1; i++) {
if (transfer == aha274x_synctab[i].period) {
*rate = (aha274x_synctab[i].rate << 4) | (offset & 0xf);
return;
}
if (transfer > aha274x_synctab[i].period &&
transfer < aha274x_synctab[i+1].period)
{
*rate = (aha274x_synctab[i+1].rate << 4) |
(offset & 0xf);
return;
}
}
*rate = 0;
}
/*
* Pause the sequencer and wait for it to actually stop - this
* is important since the sequencer can disable pausing for critical
* sections.
*/
#define PAUSE_SEQUENCER(p) \
do { \
outb(0xe, O_HCNTRL(p->base)); /* IRQMS|PAUSE|INTEN */ \
\
while ((inb(O_HCNTRL(p->base)) & 0x4) == 0) \
; \
} while (0)
/*
* Unpause the sequencer. Unremarkable, yet done often enough to
* warrant an easy way to do it.
*/
#define UNPAUSE_SEQUENCER(p) \
outb(p->unpause, O_HCNTRL(p->base)) /* IRQMS|INTEN */
/*
* See comments in aha274x_loadram() wrt this.
*/
#define RESTART_SEQUENCER(p) \
do { \
do { \
outb(0x2, O_SEQCTL(p->base)); \
} while (inw(O_SEQADDR(p->base)) != 0); \
\
UNPAUSE_SEQUENCER(p); \
} while (0)
/*
* Since we declared this using SA_INTERRUPT, interrupts should
* be disabled all through this function unless we say otherwise.
*/
static
void aha274x_isr(int irq)
{
int base, intstat;
struct aha274x_host *p;
p = (struct aha274x_host *)aha274x_boards[irq]->hostdata;
base = p->base;
/*
* Handle all the interrupt sources - especially for SCSI
* interrupts, we won't get a second chance at them.
*/
intstat = inb(O_INTSTAT(base));
if (intstat & 0x8) { /* BRKADRINT */
panic("aha274x_isr: brkadrint, error = 0x%x, seqaddr = 0x%x\n",
inb(O_ERROR(base)), inw(O_SEQADDR(base)));
}
if (intstat & 0x4) { /* SCSIINT */
int scbptr = inb(O_SCBPTR(base));
int status = inb(O_SSTAT1(base));
Scsi_Cmnd *cmd;
cmd = (Scsi_Cmnd *)p->SCB_array[scbptr];
if (!cmd) {
printk("aha274x_isr: no command for scb (scsiint)\n");
/*
* Turn off the interrupt and set status
* to zero, so that it falls through the
* reset of the SCSIINT code.
*/
outb(status, O_CLRSINT1(base));
UNPAUSE_SEQUENCER(p);
outb(0x4, O_CLRINT(base)); /* undocumented */
status = 0;
}
p->SCB_array[scbptr] = NULL;
/*
* Only the SCSI Status 1 register has information
* about exceptional conditions that we'd have a
* SCSIINT about; anything in SSTAT0 will be handled
* by the sequencer. Note that there can be multiple
* bits set.
*/
if (status & 0x80) { /* SELTO */
/*
* Hardware selection timer has expired. Turn
* off SCSI selection sequence.
*/
outb(0, O_SCSISEQ(base));
cmd->result = DID_TIME_OUT << 16;
/*
* If there's an active message, it belongs to the
* command that is getting punted - remove it.
*/
outb(0, HA_MSG_FLAGS(base));
/*
* Shut off the offending interrupt sources, reset
* the sequencer address to zero and unpause it,
* then call the high-level SCSI completion routine.
*
* WARNING! This is a magic sequence! After many
* hours of guesswork, turning off the SCSI interrupts
* in CLRSINT? does NOT clear the SCSIINT bit in
* INTSTAT. By writing to the (undocumented, unused
* according to the AIC-7770 manual) third bit of
* CLRINT, you can clear INTSTAT. But, if you do it
* while the sequencer is paused, you get a BRKADRINT
* with an Illegal Host Address status, so the
* sequencer has to be restarted first.
*/
outb(0x80, O_CLRSINT1(base)); /* CLRSELTIMO */
RESTART_SEQUENCER(p);
outb(0x4, O_CLRINT(base)); /* undocumented */
cmd->scsi_done(cmd);
}
if (status & 0x4) { /* SCSIPERR */
/*
* A parity error has occurred during a data
* transfer phase. Flag it and continue.
*/
printk("aha274x: parity error on target %d, lun %d\n",
cmd->target,
cmd->lun);
aha274x_parity(cmd) = DID_PARITY;
/*
* Clear interrupt and resume as above.
*/
outb(0x4, O_CLRSINT1(base)); /* CLRSCSIPERR */
UNPAUSE_SEQUENCER(p);
outb(0x4, O_CLRINT(base)); /* undocumented */
}
if ((status & (0x8|0x4)) == 0 && status) {
/*
* We don't know what's going on. Turn off the
* interrupt source and try to continue.
*/
printk("aha274x_isr: sstat1 = 0x%x\n", status);
outb(status, O_CLRSINT1(base));
UNPAUSE_SEQUENCER(p);
outb(0x4, O_CLRINT(base)); /* undocumented */
}
}
if (intstat & 0x2) { /* CMDCMPLT */
int complete, old_scbptr;
struct aha274x_scb scb;
unsigned actual;
Scsi_Cmnd *cmd;
/*
* The sequencer will continue running when it
* issues this interrupt. There may be >1 commands
* finished, so loop until we've processed them all.
*/
do {
complete = inb(O_QOUTFIFO(base));
cmd = (Scsi_Cmnd *)p->SCB_array[complete];
if (!cmd) {
printk("aha274x warning: "
"no command for scb (cmdcmplt)\n");
continue;
}
p->SCB_array[complete] = NULL;
PAUSE_SEQUENCER(p);
/*
* After pausing the sequencer (and waiting
* for it to stop), save its SCB pointer, then
* write in our completed one and read the SCB
* registers. Afterwards, restore the saved
* pointer, unpause the sequencer and call the
* higher-level completion function - unpause
* first since we have no idea how long done()
* will take.
*/
old_scbptr = inb(O_SCBPTR(base));
outb(complete, O_SCBPTR(base));
aha274x_getscb(base, &scb);
outb(old_scbptr, O_SCBPTR(base));
UNPAUSE_SEQUENCER(p);
cmd->result = scb.target_status |
(aha274x_parity(cmd) << 16);
/*
* Did we underflow? At this time, there's only
* one other driver that bothers to check for this,
* and cmd->underflow seems to be set rather half-
* heartedly in the higher-level SCSI code.
*/
actual = aha274x_length(cmd,
scb.residual_SG_segment_count);
actual -= ((scb.residual_data_count[2] << 16) |
(scb.residual_data_count[1] << 8) |
(scb.residual_data_count[0]));
if (actual < cmd->underflow) {
printk("aha274x: target %d underflow - "
"wanted (at least) %u, got %u\n",
cmd->target, cmd->underflow, actual);
cmd->result = scb.target_status |
(DID_UNDERFLOW << 16);
}
cmd->scsi_done(cmd);
/*
* Clear interrupt status before checking
* the output queue again. This eliminates
* a race condition whereby a command could
* complete between the queue poll and the
* interrupt clearing, so notification of the
* command being complete never made it back
* up to the kernel.
*/
outb(0x2, O_CLRINT(base)); /* CLRCMDINT */
} while (inb(O_QOUTCNT(base)));
}
if (intstat & 0x1) { /* SEQINT */
unsigned char transfer, offset, rate;
/*
* Although the sequencer is paused immediately on
* a SEQINT, an interrupt for a SCSIINT or a CMDCMPLT
* condition will have unpaused the sequencer before
* this point.
*/
PAUSE_SEQUENCER(p);
switch (intstat & 0xf0) {
case 0x00:
panic("aha274x_isr: unknown scsi bus phase\n");
case 0x10:
debug("aha274x_isr warning: "
"issuing message reject, 1st byte 0x%x\n",
inb(HA_REJBYTE(base)));
break;
case 0x20:
panic("aha274x_isr: reconnecting target %d "
"didn't issue IDENTIFY message\n",
(inb(O_SELID(base)) >> 4) & 0xf);
case 0x30:
debug("aha274x_isr: sequencer couldn't find match "
"for reconnecting target %d - issuing ABORT\n",
(inb(O_SELID(base)) >> 4) & 0xf);
break;
case 0x40:
transfer = inb(HA_ARG_1(base));
offset = inb(HA_ARG_2(base));
aha274x_to_scsirate(&rate, transfer, offset);
outb(rate, HA_RETURN_1(base));
debug_rate(base, rate);
break;
default:
debug("aha274x_isr: seqint, "
"intstat = 0x%x, scsisigi = 0x%x\n",
intstat, inb(O_SCSISIGI(base)));
break;
}
outb(0x1, O_CLRINT(base)); /* CLRSEQINT */
UNPAUSE_SEQUENCER(p);
}
}
/*
* Probing for EISA boards: it looks like the first two bytes
* are a manufacturer code - three characters, five bits each:
*
* BYTE 0 BYTE 1 BYTE 2 BYTE 3
* ?1111122 22233333 PPPPPPPP RRRRRRRR
*
* The characters are baselined off ASCII '@', so add that value
* to each to get the real ASCII code for it. The next two bytes
* appear to be a product and revision number, probably vendor-
* specific. This is what is being searched for at each port,
* and what should probably correspond to the ID= field in the
* ECU's .cfg file for the card - if your card is not detected,
* make sure your signature is listed in the array.
*
* The fourth byte's lowest bit seems to be an enabled/disabled
* flag (rest of the bits are reserved?).
*/
static
enum aha_type aha274x_probe(int slot, int s_base)
{
int i;
unsigned char buf[4];
static struct {
int n;
unsigned char signature[sizeof(buf)];
enum aha_type type;
} S[] = {
4, { 0x04, 0x90, 0x77, 0x71 }, T_274X, /* host adapter 274x */
4, { 0x04, 0x90, 0x77, 0x70 }, T_274X, /* motherboard 274x */
4, { 0x04, 0x90, 0x77, 0x56 }, T_284X, /* 284x, BIOS enabled */
};
for (i = 0; i < sizeof(buf); i++) {
/*
* The VL-bus cards need to be primed by
* writing before a signature check.
*/
outb(0x80 + i, s_base);
buf[i] = inb(s_base + i);
}
for (i = 0; i < sizeof(S)/sizeof(S[0]); i++) {
if (!memcmp(buf, S[i].signature, S[i].n)) {
/*
* Signature match on enabled card?
*/
if (inb(s_base + 4) & 1)
return(S[i].type);
printk("aha274x disabled at slot %d, ignored\n", slot);
}
}
return(T_NONE);
}
/*
* Return ' ' for plain 274x, 'T' for twin-channel, 'W' for
* wide channel, '?' for anything else.
*/
static
char aha274x_type(int base)
{
/*
* The AIC-7770 can be wired so that, on chip reset,
* the SCSI Block Control register indicates how many
* busses the chip is configured for.
*/
switch (inb(O_SBLKCTL(base))) {
case 0:
return(' ');
case 2:
return('W');
case 8:
return('T');
default:
printk("aha274x has unknown bus configuration\n");
return('?');
}
}
static
void aha274x_loadram(int base)
{
static unsigned char seqprog[] = {
/*
* Each sequencer instruction is 29 bits
* long (fill in the excess with zeroes)
* and has to be loaded from least -> most
* significant byte, so this table has the
* byte ordering reversed.
*/
# include "aha274x_seq.h"
};
/*
* When the AIC-7770 is paused (as on chip reset), the
* sequencer address can be altered and a sequencer
* program can be loaded by writing it, byte by byte, to
* the sequencer RAM port - the Adaptec documentation
* recommends using REP OUTSB to do this, hence the inline
* assembly. Since the address autoincrements as we load
* the program, reset it back to zero afterward. Disable
* sequencer RAM parity error detection while loading, and
* make sure the LOADRAM bit is enabled for loading.
*/
outb(0x83, O_SEQCTL(base)); /* PERRORDIS|SEQRESET|LOADRAM */
asm volatile("cld\n\t"
"rep\n\t"
"outsb"
: /* no output */
:"S" (seqprog), "c" (sizeof(seqprog)), "d" (O_SEQRAM(base))
:"si", "cx", "dx");
/*
* WARNING! This is a magic sequence! After extensive
* experimentation, it seems that you MUST turn off the
* LOADRAM bit before you play with SEQADDR again, else
* you will end up with parity errors being flagged on
* your sequencer program. (You would also think that
* turning off LOADRAM and setting SEQRESET to reset the
* address to zero would work, but you need to do it twice
* for it to take effect on the address. Timing problem?)
*/
outb(0, O_SEQCTL(base));
do {
/*
* Actually, reset it until
* the address shows up as
* zero just to be safe..
*/
outb(0x2, O_SEQCTL(base)); /* SEQRESET */
} while (inw(O_SEQADDR(base)) != 0);
}
static
int aha274x_register(Scsi_Host_Template *template,
enum aha_type type,
int base)
{
int i, irq, scsi_id;
struct Scsi_Host *host;
struct aha274x_host *p;
/*
* Give the AIC-7770 a reset - reading the 274x's registers
* returns zeroes unless you do. This forces a pause of the
* Sequencer.
*/
outb(1, O_HCNTRL(base)); /* CHIPRST */
/*
* The IRQ level in i/o port 4 maps directly onto the real
* IRQ number. If it's ok, register it with the kernel.
*
* NB. the Adaptec documentation says the IRQ number is only
* in the lower four bits; the ECU information shows the
* high bit being used as well. Which is correct?
*/
irq = inb(HA_INTDEF(base)) & 0xf;
if (irq < 9 || irq > 15) {
printk("aha274x uses unsupported IRQ level, ignoring\n");
return(0);
}
/*
* Lock out other contenders for our i/o space.
*/
snarf_region(O_MINREG(base), O_MAXREG(base)-O_MINREG(base));
/*
* Any card-type-specific adjustments before we register
* the scsi host(s).
*/
scsi_id = inb(HA_SCSICONF(base)) & 0x7;
switch (aha274x_type(base)) {
case 'T':
printk("aha274x warning: ignoring channel B of 274x-twin\n");
break;
case ' ':
break;
default:
printk("aha274x is an unsupported type, ignoring\n");
free_irq(irq);
return(0);
}
/*
* Before registry, make sure that the offsets of the
* struct scatterlist are what the sequencer will expect,
* otherwise disable scatter-gather altogether until someone
* can fix it. This is important since the sequencer will
* DMA elements of the SG array in while executing commands.
*/
if (template->sg_tablesize != SG_NONE) {
struct scatterlist sg;
if (SG_STRUCT_CHECK(sg)) {
printk("aha274x warning: kernel scatter-gather "
"structures changed, disabling it\n");
template->sg_tablesize = SG_NONE;
}
}
/*
* Register each "host" and fill in the returned Scsi_Host
* structure as best we can. Some of the parameters aren't
* really relevant for EISA, and none of the high-level SCSI
* code looks at it anyway.. why are the fields there? Also
* save the pointer so that we can find the information when
* an IRQ is triggered.
*/
host = scsi_register(template, sizeof(struct aha274x_host));
host->this_id = scsi_id;
host->irq = irq;
aha274x_boards[irq] = host;
p = (struct aha274x_host *)host->hostdata;
for (i = 0; i < AHA274X_MAXSCB; i++)
p->SCB_array[i] = NULL;
p->base = base;
/*
* The interrupt trigger is different depending
* on whether the card is EISA or VL-bus.
*/
p->unpause = (type != T_274X ? 0x2 : 0xa);
/*
* Register IRQ with the kernel _after_ the host information
* is set up, in case we take an interrupt right away.
*
* XXX - the card is reset and disabled, so why would we be
* getting an interrupt?
*/
if (request_irq(irq, aha274x_isr, SA_INTERRUPT, "AHA274x/284x")) {
printk("aha274x couldn't register irq %d, ignoring\n", irq);
return(0);
}
/*
* Print out debugging information before re-enabling
* the card - a lot of registers on it can't be read
* when the sequencer is active.
*/
debug_config(type, base);
/*
* Load the sequencer program, then re-enable the board -
* resetting the AIC-7770 disables it, leaving the lights
* on with nobody home.
*/
aha274x_loadram(base);
outb(1, O_BCTL(base)); /* ENABLE */
/*
* Set the host adapter registers to indicate that synchronous
* negotiation should be attempted the first time the targets
* are communicated with. Also initialize the active message
* flag to indicate that there is no message.
*/
outb(0xff, HA_NEEDSDTR(base));
outb(0, HA_MSG_FLAGS(base));
/*
* Unpause the sequencer before returning and enable
* interrupts - we shouldn't get any until the first
* command is sent to us by the high-level SCSI code.
*/
UNPAUSE_SEQUENCER(p);
return(1);
}
int aha274x_detect(Scsi_Host_Template *template)
{
enum aha_type type;
int found = 0, slot, base;
for (slot = MINEISA; slot <= MAXEISA; slot++) {
base = SLOTBASE(slot);
if (check_region(O_MINREG(base),
O_MAXREG(base)-O_MINREG(base)))
{
/*
* Some other driver has staked a
* claim to this i/o region already.
*/
continue;
}
type = aha274x_probe(slot, O_BIDx(base));
if (type != T_NONE) {
/*
* We "find" a 274x if we locate the card
* signature and we can set it up and register
* it with the kernel without incident.
*/
found += aha274x_register(template, type, base);
}
}
template->name = (char *)aha274x_info();
return(found);
}
const char *aha274x_info(void)
{
return("Adaptec AHA274x/284x (EISA/VL-bus -> Fast SCSI) "
AHA274X_SEQ_VERSION "/"
AHA274X_H_VERSION "/"
"1.25");
}
int aha274x_command(Scsi_Cmnd *cmd)
{
/*
* This is a relic of non-interrupt-driven SCSI
* drivers. With the can_queue variable set, this
* should never be called.
*/
panic("aha274x_command was called\n");
}
static
void aha274x_buildscb(struct aha274x_host *p,
Scsi_Cmnd *cmd,
struct aha274x_scb *scb)
{
void *addr;
unsigned length;
memset(scb, 0, sizeof(*scb));
/*
* NB. channel selection (bit 3) is always zero.
*/
scb->target_channel_lun = ((cmd->target << 4) & 0xf0) |
(cmd->lun & 0x7);
/*
* The interpretation of request_buffer and request_bufflen
* changes depending on whether or not use_sg is zero; a
* non-zero use_sg indicates the number of elements in the
* scatter-gather array.
*
* The AIC-7770 can't support transfers of any sort larger
* than 2^24 (three-byte count) without backflips. For what
* the kernel is doing, this shouldn't occur. I hope.
*/
length = aha274x_length(cmd, 0);
/*
* The sequencer code cannot yet handle scatter-gather segments
* larger than 64k (two-byte length). The 1.1.x kernels, however,
* have a four-byte length field in the struct scatterlist, so
* make sure we don't exceed 64k on these kernels for now.
*/
aha274x_sg_check(cmd);
if (length > 0xffffff) {
panic("aha274x_buildscb: can't transfer > 2^24 - 1 bytes\n");
}
/*
* XXX - this relies on the host data being stored in a
* little-endian format.
*/
addr = cmd->cmnd;
scb->SCSI_cmd_length = COMMAND_SIZE(cmd->cmnd[0]);
memcpy(scb->SCSI_cmd_pointer, &addr, sizeof(scb->SCSI_cmd_pointer));
if (cmd->use_sg) {
#if 0
debug("aha274x_buildscb: SG used, %d segments, length %u\n",
cmd->use_sg,
length);
#endif
scb->SG_segment_count = cmd->use_sg;
memcpy(scb->SG_list_pointer,
&cmd->request_buffer,
sizeof(scb->SG_list_pointer));
} else {
scb->SG_segment_count = 0;
memcpy(scb->data_pointer,
&cmd->request_buffer,
sizeof(scb->data_pointer));
memcpy(scb->data_count,
&cmd->request_bufflen,
sizeof(scb->data_count));
}
}
static
void aha274x_putscb(int base, struct aha274x_scb *scb)
{
/*
* By turning on the SCB auto increment, any reference
* to the SCB I/O space postincrements the SCB address
* we're looking at. So turn this on and dump the relevant
* portion of the SCB to the card.
*/
outb(0x80, O_SCBCNT(base)); /* SCBAUTO */
asm volatile("cld\n\t"
"rep\n\t"
"outsb"
: /* no output */
:"S" (scb), "c" (sizeof(*scb)), "d" (O_SCBARRAY(base))
:"si", "cx", "dx");
outb(0, O_SCBCNT(base));
}
int aha274x_queue(Scsi_Cmnd *cmd, void (*fn)(Scsi_Cmnd *))
{
long flags;
int empty, old_scbptr;
struct aha274x_host *p;
struct aha274x_scb scb;
#if 0
debug("aha274x_queue: cmd 0x%x (size %u), target %d, lun %d\n",
cmd->cmnd[0],
COMMAND_SIZE(cmd->cmnd[0]),
cmd->target,
cmd->lun);
#endif
p = (struct aha274x_host *)cmd->host->hostdata;
/*
* Construct the SCB beforehand, so the sequencer is
* paused a minimal amount of time.
*/
aha274x_buildscb(p, cmd, &scb);
/*
* This is a critical section, since we don't want the
* interrupt routine mucking with the host data or the
* card. Since the kernel documentation is vague on
* whether or not we are in a cli/sti pair already, save
* the flags to be on the safe side.
*/
save_flags(flags);
cli();
/*
* Find a free slot in the SCB array to load this command
* into. Since can_queue is set to AHA274X_MAXSCB, we
* should always find one.
*/
for (empty = 0; empty < AHA274X_MAXSCB; empty++)
if (!p->SCB_array[empty])
break;
if (empty == AHA274X_MAXSCB)
panic("aha274x_queue: couldn't find a free scb\n");
/*
* Pause the sequencer so we can play with its registers -
* wait for it to acknowledge the pause.
*
* XXX - should the interrupts be left on while doing this?
*/
PAUSE_SEQUENCER(p);
/*
* Save the SCB pointer and put our own pointer in - this
* selects one of the four banks of SCB registers. Load
* the SCB, then write its pointer into the queue in FIFO
* and restore the saved SCB pointer.
*/
old_scbptr = inb(O_SCBPTR(p->base));
outb(empty, O_SCBPTR(p->base));
aha274x_putscb(p->base, &scb);
outb(empty, O_QINFIFO(p->base));
outb(old_scbptr, O_SCBPTR(p->base));
/*
* Make sure the Scsi_Cmnd pointer is saved, the struct it
* points to is set up properly, and the parity error flag
* is reset, then unpause the sequencer and watch the fun
* begin.
*/
cmd->scsi_done = fn;
p->SCB_array[empty] = cmd;
aha274x_parity(cmd) = DID_OK;
UNPAUSE_SEQUENCER(p);
restore_flags(flags);
return(0);
}
/* return values from aha274x_kill */
enum k_state {
k_ok, /* scb found and message sent */
k_busy, /* message already present */
k_absent, /* couldn't locate scb */
k_disconnect, /* scb found, but disconnected */
};
/*
* This must be called with interrupts disabled - it's going to
* be messing around with the host data, and an interrupt being
* fielded in the middle could get ugly.
*
* Since so much of the abort and reset code is shared, this
* function performs more magic than it really should. If the
* command completes ok, then it will call scsi_done with the
* result code passed in. The unpause parameter controls whether
* or not the sequencer gets unpaused - the reset function, for
* instance, may want to do something more aggressive.
*
* Note that the command is checked for in our SCB_array first
* before the sequencer is paused, so if k_absent is returned,
* then the sequencer is NOT paused.
*/
static
enum k_state aha274x_kill(Scsi_Cmnd *cmd, unsigned char message,
unsigned int result, int unpause)
{
struct aha274x_host *p;
int i, scb, found, queued;
unsigned char scbsave[AHA274X_MAXSCB];
p = (struct aha274x_host *)cmd->host->hostdata;
/*
* If we can't find the command, assume it just completed
* and shrug it away.
*/
for (scb = 0; scb < AHA274X_MAXSCB; scb++)
if (p->SCB_array[scb] == cmd)
break;
if (scb == AHA274X_MAXSCB)
return(k_absent);
PAUSE_SEQUENCER(p);
/*
* This is the best case, really. Check to see if the
* command is still in the sequencer's input queue. If
* so, simply remove it. Reload the queue afterward.
*/
queued = inb(O_QINCNT(p->base));
for (i = found = 0; i < queued; i++) {
scbsave[i] = inb(O_QINFIFO(p->base));
if (scbsave[i] == scb) {
found = 1;
i -= 1;
}
}
queued -= found;
for (i = 0; i < queued; i++)
outb(scbsave[i], O_QINFIFO(p->base));
if (found)
goto complete;
/*
* Check the current SCB bank. If it's not the one belonging
* to the command we want to kill, assume that the command
* is disconnected. It's rather a pain to force a reconnect
* and send a message to the target, so we abdicate responsibility
* in this case.
*/
if (inb(O_SCBPTR(p->base)) != scb) {
if (unpause)
UNPAUSE_SEQUENCER(p);
return(k_disconnect);
}
/*
* Presumably at this point our target command is active. Check
* to see if there's a message already in effect. If not, place
* our message in and assert ATN so the target goes into MESSAGE
* OUT phase.
*/
if (inb(HA_MSG_FLAGS(p->base)) & 0x80) {
if (unpause)
UNPAUSE_SEQUENCER(p);
return(k_busy);
}
outb(0x80, HA_MSG_FLAGS(p->base)); /* active message */
outb(1, HA_MSG_LEN(p->base)); /* length = 1 */
outb(message, HA_MSG_START(p->base)); /* message body */
/*
* Assert ATN. Use the value of SCSISIGO saved by the
* sequencer code so we don't alter its contents radically
* in the middle of something critical.
*/
outb(inb(HA_SIGSTATE(p->base)) | 0x10, O_SCSISIGO(p->base));
/*
* The command has been killed. Do the bookkeeping, unpause
* the sequencer, and notify the higher-level SCSI code.
*/
complete:
p->SCB_array[scb] = NULL;
if (unpause)
UNPAUSE_SEQUENCER(p);
cmd->result = result << 16;
cmd->scsi_done(cmd);
return(k_ok);
}
int aha274x_abort(Scsi_Cmnd *cmd)
{
int rv;
long flags;
save_flags(flags);
cli();
switch (aha274x_kill(cmd, ABORT, DID_ABORT, !0)) {
case k_ok: rv = SCSI_ABORT_SUCCESS; break;
case k_busy: rv = SCSI_ABORT_BUSY; break;
case k_absent: rv = SCSI_ABORT_NOT_RUNNING; break;
case k_disconnect: rv = SCSI_ABORT_SNOOZE; break;
default:
panic("aha274x_do_abort: internal error\n");
}
restore_flags(flags);
return(rv);
}
/*
* Resetting the bus always succeeds - is has to, otherwise the
* kernel will panic! Try a surgical technique - sending a BUS
* DEVICE RESET message - on the offending target before pulling
* the SCSI bus reset line.
*/
int aha274x_reset(Scsi_Cmnd *cmd)
{
int i;
long flags;
Scsi_Cmnd *reset;
struct aha274x_host *p;
p = (struct aha274x_host *)cmd->host->hostdata;
save_flags(flags);
cli();
switch (aha274x_kill(cmd, BUS_DEVICE_RESET, DID_RESET, 0)) {
case k_ok:
/*
* The RESET message was sent to the target
* with no problems. Flag that target as
* needing a SDTR negotiation on the next
* connection and restart the sequencer.
*/
outb((1 << cmd->target), HA_NEEDSDTR(p->base));
UNPAUSE_SEQUENCER(p);
break;
case k_absent:
/*
* The sequencer will not be paused if aha274x_kill()
* couldn't find the command.
*/
PAUSE_SEQUENCER(p);
/* falls through */
case k_busy:
case k_disconnect:
/*
* Do a hard reset of the SCSI bus. According to the
* SCSI-2 draft specification, reset has to be asserted
* for at least 25us. I'm invoking the kernel delay
* function for 30us since I'm not totally trusting of
* the busy loop timing.
*
* XXX - I'm not convinced this works. I tried resetting
* the bus before, trying to get the devices on the
* bus to revert to asynchronous transfer, and it
* never seemed to work.
*/
debug("aha274x: attempting to reset scsi bus and card\n");
outb(1, O_SCSISEQ(p->base)); /* SCSIRSTO */
udelay(30);
outb(0, O_SCSISEQ(p->base)); /* !SCSIRSTO */
outb(0xff, HA_NEEDSDTR(p->base));
UNPAUSE_SEQUENCER(p);
/*
* Locate the command and return a "reset" status
* for it. This is not completely correct and will
* probably return to haunt me later.
*/
for (i = 0; i < AHA274X_MAXSCB; i++) {
if (cmd == p->SCB_array[i]) {
reset = (Scsi_Cmnd *)p->SCB_array[i];
p->SCB_array[i] = NULL;
reset->result = DID_RESET << 16;
reset->scsi_done(reset);
break;
}
}
break;
default:
panic("aha274x_reset: internal error\n");
}
restore_flags(flags);
return(SCSI_RESET_SUCCESS);
}
int aha274x_biosparam(Disk *disk, int devno, int geom[])
{
/*
* XXX - when I find the EISA configuration information,
* this should change to handle the "extended translation
* for drives >1G" option, which uses 255 heads and
* 63 sectors/track for drives >1G. Right now, just
* assume it's turned off.
*/
debug("aha274x_biosparam warning: don't know translation config\n");
geom[0] = 64;
geom[1] = 32;
geom[2] = disk->capacity / (64 * 32);
return(0);
}