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NCR53c406a.c
1091 lines (936 loc) · 28.1 KB
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NCR53c406a.c
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/*
* NCR53c406.c
* Low-level SCSI driver for NCR53c406a chip.
* Copyright (C) 1994, 1995, 1996 Normunds Saumanis (normunds@fi.ibm.com)
*
* LILO command line usage: ncr53c406a=<PORTBASE>[,<IRQ>[,<FASTPIO>]]
* Specify IRQ = 0 for non-interrupt driven mode.
* FASTPIO = 1 for fast pio mode, 0 for slow mode.
*
* 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, 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.
*
*/
#define NCR53C406A_DEBUG 0
#define VERBOSE_NCR53C406A_DEBUG 0
/* Set this to 1 for PIO mode (recommended) or to 0 for DMA mode */
#define USE_PIO 1
#define USE_BIOS 0
/* #define BIOS_ADDR 0xD8000 *//* define this if autoprobe fails */
/* #define PORT_BASE 0x330 *//* define this if autoprobe fails */
/* #define IRQ_LEV 0 *//* define this if autoprobe fails */
#define DMA_CHAN 5 /* this is ignored if DMA is disabled */
/* Set this to 0 if you encounter kernel lockups while transferring
* data in PIO mode */
#define USE_FAST_PIO 1
/* ============= End of user configurable parameters ============= */
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/irq.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
/* ============================================================= */
#define WATCHDOG 5000000
#define SYNC_MODE 0 /* Synchronous transfer mode */
#ifdef DEBUG
#undef NCR53C406A_DEBUG
#define NCR53C406A_DEBUG 1
#endif
#if USE_PIO
#define USE_DMA 0
#else
#define USE_DMA 1
#endif
/* Default configuration */
#define C1_IMG 0x07 /* ID=7 */
#define C2_IMG 0x48 /* FE SCSI2 */
#if USE_DMA
#define C3_IMG 0x21 /* CDB TE */
#else
#define C3_IMG 0x20 /* CDB */
#endif
#define C4_IMG 0x04 /* ANE */
#define C5_IMG 0xb6 /* AA PI SIE POL */
#define REG0 (outb(C4_IMG, CONFIG4))
#define REG1 (outb(C5_IMG, CONFIG5))
#if NCR53C406A_DEBUG
#define DEB(x) x
#else
#define DEB(x)
#endif
#if VERBOSE_NCR53C406A_DEBUG
#define VDEB(x) x
#else
#define VDEB(x)
#endif
#define LOAD_DMA_COUNT(count) \
outb(count & 0xff, TC_LSB); \
outb((count >> 8) & 0xff, TC_MSB); \
outb((count >> 16) & 0xff, TC_HIGH);
/* Chip commands */
#define DMA_OP 0x80
#define SCSI_NOP 0x00
#define FLUSH_FIFO 0x01
#define CHIP_RESET 0x02
#define SCSI_RESET 0x03
#define RESELECT 0x40
#define SELECT_NO_ATN 0x41
#define SELECT_ATN 0x42
#define SELECT_ATN_STOP 0x43
#define ENABLE_SEL 0x44
#define DISABLE_SEL 0x45
#define SELECT_ATN3 0x46
#define RESELECT3 0x47
#define TRANSFER_INFO 0x10
#define INIT_CMD_COMPLETE 0x11
#define MSG_ACCEPT 0x12
#define TRANSFER_PAD 0x18
#define SET_ATN 0x1a
#define RESET_ATN 0x1b
#define SEND_MSG 0x20
#define SEND_STATUS 0x21
#define SEND_DATA 0x22
#define DISCONN_SEQ 0x23
#define TERMINATE_SEQ 0x24
#define TARG_CMD_COMPLETE 0x25
#define DISCONN 0x27
#define RECV_MSG 0x28
#define RECV_CMD 0x29
#define RECV_DATA 0x2a
#define RECV_CMD_SEQ 0x2b
#define TARGET_ABORT_DMA 0x04
/*----------------------------------------------------------------*/
/* the following will set the monitor border color (useful to find
where something crashed or gets stuck at */
/* 1 = blue
2 = green
3 = cyan
4 = red
5 = magenta
6 = yellow
7 = white
*/
#if NCR53C406A_DEBUG
#define rtrc(i) {inb(0x3da);outb(0x31,0x3c0);outb((i),0x3c0);}
#else
#define rtrc(i) {}
#endif
/*----------------------------------------------------------------*/
enum Phase {
idle,
data_out,
data_in,
command_ph,
status_ph,
message_out,
message_in
};
/* Static function prototypes */
static void NCR53c406a_intr(void *);
static irqreturn_t do_NCR53c406a_intr(int, void *);
static void chip_init(void);
static void calc_port_addr(void);
#ifndef IRQ_LEV
static int irq_probe(void);
#endif
/* ================================================================= */
#if USE_BIOS
static void *bios_base;
#endif
#ifdef PORT_BASE
static int port_base = PORT_BASE;
#else
static int port_base;
#endif
#ifdef IRQ_LEV
static int irq_level = IRQ_LEV;
#else
static int irq_level = -1; /* 0 is 'no irq', so use -1 for 'uninitialized' */
#endif
#if USE_DMA
static int dma_chan;
#endif
#if USE_PIO
static int fast_pio = USE_FAST_PIO;
#endif
static Scsi_Cmnd *current_SC;
static char info_msg[256];
/* ================================================================= */
/* possible BIOS locations */
#if USE_BIOS
static void *addresses[] = {
(void *) 0xd8000,
(void *) 0xc8000
};
#define ADDRESS_COUNT ARRAY_SIZE(addresses)
#endif /* USE_BIOS */
/* possible i/o port addresses */
static unsigned short ports[] = { 0x230, 0x330, 0x280, 0x290, 0x330, 0x340, 0x300, 0x310, 0x348, 0x350 };
#define PORT_COUNT ARRAY_SIZE(ports)
#ifndef MODULE
/* possible interrupt channels */
static unsigned short intrs[] = { 10, 11, 12, 15 };
#define INTR_COUNT ARRAY_SIZE(intrs)
#endif /* !MODULE */
/* signatures for NCR 53c406a based controllers */
#if USE_BIOS
struct signature {
char *signature;
int sig_offset;
int sig_length;
} signatures[] __initdata = {
/* 1 2 3 4 5 6 */
/* 123456789012345678901234567890123456789012345678901234567890 */
{
"Copyright (C) Acculogic, Inc.\r\n2.8M Diskette Extension Bios ver 4.04.03 03/01/1993", 61, 82},};
#define SIGNATURE_COUNT ARRAY_SIZE(signatures)
#endif /* USE_BIOS */
/* ============================================================ */
/* Control Register Set 0 */
static int TC_LSB; /* transfer counter lsb */
static int TC_MSB; /* transfer counter msb */
static int SCSI_FIFO; /* scsi fifo register */
static int CMD_REG; /* command register */
static int STAT_REG; /* status register */
static int DEST_ID; /* selection/reselection bus id */
static int INT_REG; /* interrupt status register */
static int SRTIMOUT; /* select/reselect timeout reg */
static int SEQ_REG; /* sequence step register */
static int SYNCPRD; /* synchronous transfer period */
static int FIFO_FLAGS; /* indicates # of bytes in fifo */
static int SYNCOFF; /* synchronous offset register */
static int CONFIG1; /* configuration register */
static int CLKCONV; /* clock conversion reg */
/*static int TESTREG;*//* test mode register */
static int CONFIG2; /* Configuration 2 Register */
static int CONFIG3; /* Configuration 3 Register */
static int CONFIG4; /* Configuration 4 Register */
static int TC_HIGH; /* Transfer Counter High */
/*static int FIFO_BOTTOM;*//* Reserve FIFO byte register */
/* Control Register Set 1 */
/*static int JUMPER_SENSE;*//* Jumper sense port reg (r/w) */
/*static int SRAM_PTR;*//* SRAM address pointer reg (r/w) */
/*static int SRAM_DATA;*//* SRAM data register (r/w) */
static int PIO_FIFO; /* PIO FIFO registers (r/w) */
/*static int PIO_FIFO1;*//* */
/*static int PIO_FIFO2;*//* */
/*static int PIO_FIFO3;*//* */
static int PIO_STATUS; /* PIO status (r/w) */
/*static int ATA_CMD;*//* ATA command/status reg (r/w) */
/*static int ATA_ERR;*//* ATA features/error register (r/w) */
static int PIO_FLAG; /* PIO flag interrupt enable (r/w) */
static int CONFIG5; /* Configuration 5 register (r/w) */
/*static int SIGNATURE;*//* Signature Register (r) */
/*static int CONFIG6;*//* Configuration 6 register (r) */
/* ============================================================== */
#if USE_DMA
static __inline__ int NCR53c406a_dma_setup(unsigned char *ptr, unsigned int count, unsigned char mode)
{
unsigned limit;
unsigned long flags = 0;
VDEB(printk("dma: before count=%d ", count));
if (dma_chan <= 3) {
if (count > 65536)
count = 65536;
limit = 65536 - (((unsigned) ptr) & 0xFFFF);
} else {
if (count > (65536 << 1))
count = (65536 << 1);
limit = (65536 << 1) - (((unsigned) ptr) & 0x1FFFF);
}
if (count > limit)
count = limit;
VDEB(printk("after count=%d\n", count));
if ((count & 1) || (((unsigned) ptr) & 1))
panic("NCR53c406a: attempted unaligned DMA transfer\n");
flags = claim_dma_lock();
disable_dma(dma_chan);
clear_dma_ff(dma_chan);
set_dma_addr(dma_chan, (long) ptr);
set_dma_count(dma_chan, count);
set_dma_mode(dma_chan, mode);
enable_dma(dma_chan);
release_dma_lock(flags);
return count;
}
static __inline__ int NCR53c406a_dma_write(unsigned char *src, unsigned int count)
{
return NCR53c406a_dma_setup(src, count, DMA_MODE_WRITE);
}
static __inline__ int NCR53c406a_dma_read(unsigned char *src, unsigned int count)
{
return NCR53c406a_dma_setup(src, count, DMA_MODE_READ);
}
static __inline__ int NCR53c406a_dma_residual(void)
{
register int tmp;
unsigned long flags;
flags = claim_dma_lock();
clear_dma_ff(dma_chan);
tmp = get_dma_residue(dma_chan);
release_dma_lock(flags);
return tmp;
}
#endif /* USE_DMA */
#if USE_PIO
static __inline__ int NCR53c406a_pio_read(unsigned char *request, unsigned int reqlen)
{
int i;
int len; /* current scsi fifo size */
REG1;
while (reqlen) {
i = inb(PIO_STATUS);
/* VDEB(printk("pio_status=%x\n", i)); */
if (i & 0x80)
return 0;
switch (i & 0x1e) {
default:
case 0x10:
len = 0;
break;
case 0x0:
len = 1;
break;
case 0x8:
len = 42;
break;
case 0xc:
len = 84;
break;
case 0xe:
len = 128;
break;
}
if ((i & 0x40) && len == 0) { /* fifo empty and interrupt occurred */
return 0;
}
if (len) {
if (len > reqlen)
len = reqlen;
if (fast_pio && len > 3) {
insl(PIO_FIFO, request, len >> 2);
request += len & 0xfc;
reqlen -= len & 0xfc;
} else {
while (len--) {
*request++ = inb(PIO_FIFO);
reqlen--;
}
}
}
}
return 0;
}
static __inline__ int NCR53c406a_pio_write(unsigned char *request, unsigned int reqlen)
{
int i = 0;
int len; /* current scsi fifo size */
REG1;
while (reqlen && !(i & 0x40)) {
i = inb(PIO_STATUS);
/* VDEB(printk("pio_status=%x\n", i)); */
if (i & 0x80) /* error */
return 0;
switch (i & 0x1e) {
case 0x10:
len = 128;
break;
case 0x0:
len = 84;
break;
case 0x8:
len = 42;
break;
case 0xc:
len = 1;
break;
default:
case 0xe:
len = 0;
break;
}
if (len) {
if (len > reqlen)
len = reqlen;
if (fast_pio && len > 3) {
outsl(PIO_FIFO, request, len >> 2);
request += len & 0xfc;
reqlen -= len & 0xfc;
} else {
while (len--) {
outb(*request++, PIO_FIFO);
reqlen--;
}
}
}
}
return 0;
}
#endif /* USE_PIO */
static int __init NCR53c406a_detect(struct scsi_host_template * tpnt)
{
int present = 0;
struct Scsi_Host *shpnt = NULL;
#ifndef PORT_BASE
int i;
#endif
#if USE_BIOS
int ii, jj;
bios_base = 0;
/* look for a valid signature */
for (ii = 0; ii < ADDRESS_COUNT && !bios_base; ii++)
for (jj = 0; (jj < SIGNATURE_COUNT) && !bios_base; jj++)
if (!memcmp((void *) addresses[ii] + signatures[jj].sig_offset, (void *) signatures[jj].signature, (int) signatures[jj].sig_length))
bios_base = addresses[ii];
if (!bios_base) {
printk("NCR53c406a: BIOS signature not found\n");
return 0;
}
DEB(printk("NCR53c406a BIOS found at 0x%x\n", (unsigned int) bios_base);
);
#endif /* USE_BIOS */
#ifdef PORT_BASE
if (!request_region(port_base, 0x10, "NCR53c406a")) /* ports already snatched */
port_base = 0;
#else /* autodetect */
if (port_base) { /* LILO override */
if (!request_region(port_base, 0x10, "NCR53c406a"))
port_base = 0;
} else {
for (i = 0; i < PORT_COUNT && !port_base; i++) {
if (!request_region(ports[i], 0x10, "NCR53c406a")) {
DEB(printk("NCR53c406a: port 0x%x in use\n", ports[i]));
} else {
VDEB(printk("NCR53c406a: port 0x%x available\n", ports[i]));
outb(C5_IMG, ports[i] + 0x0d); /* reg set 1 */
if ((inb(ports[i] + 0x0e) ^ inb(ports[i] + 0x0e)) == 7 && (inb(ports[i] + 0x0e) ^ inb(ports[i] + 0x0e)) == 7 && (inb(ports[i] + 0x0e) & 0xf8) == 0x58) {
port_base = ports[i];
VDEB(printk("NCR53c406a: Sig register valid\n"));
VDEB(printk("port_base=0x%x\n", port_base));
break;
}
release_region(ports[i], 0x10);
}
}
}
#endif /* PORT_BASE */
if (!port_base) { /* no ports found */
printk("NCR53c406a: no available ports found\n");
return 0;
}
DEB(printk("NCR53c406a detected\n"));
calc_port_addr();
chip_init();
#ifndef IRQ_LEV
if (irq_level < 0) { /* LILO override if >= 0 */
irq_level = irq_probe();
if (irq_level < 0) { /* Trouble */
printk("NCR53c406a: IRQ problem, irq_level=%d, giving up\n", irq_level);
goto err_release;
}
}
#endif
DEB(printk("NCR53c406a: using port_base 0x%x\n", port_base));
present = 1;
tpnt->proc_name = "NCR53c406a";
shpnt = scsi_register(tpnt, 0);
if (!shpnt) {
printk("NCR53c406a: Unable to register host, giving up.\n");
goto err_release;
}
if (irq_level > 0) {
if (request_irq(irq_level, do_NCR53c406a_intr, 0, "NCR53c406a", shpnt)) {
printk("NCR53c406a: unable to allocate IRQ %d\n", irq_level);
goto err_free_scsi;
}
tpnt->can_queue = 1;
DEB(printk("NCR53c406a: allocated IRQ %d\n", irq_level));
} else if (irq_level == 0) {
tpnt->can_queue = 0;
DEB(printk("NCR53c406a: No interrupts detected\n"));
printk("NCR53c406a driver no longer supports polling interface\n");
printk("Please email linux-scsi@vger.kernel.org\n");
#if USE_DMA
printk("NCR53c406a: No interrupts found and DMA mode defined. Giving up.\n");
#endif /* USE_DMA */
goto err_free_scsi;
} else {
DEB(printk("NCR53c406a: Shouldn't get here!\n"));
goto err_free_scsi;
}
#if USE_DMA
dma_chan = DMA_CHAN;
if (request_dma(dma_chan, "NCR53c406a") != 0) {
printk("NCR53c406a: unable to allocate DMA channel %d\n", dma_chan);
goto err_free_irq;
}
DEB(printk("Allocated DMA channel %d\n", dma_chan));
#endif /* USE_DMA */
shpnt->irq = irq_level;
shpnt->io_port = port_base;
shpnt->n_io_port = 0x10;
#if USE_DMA
shpnt->dma = dma_chan;
#endif
#if USE_DMA
sprintf(info_msg, "NCR53c406a at 0x%x, IRQ %d, DMA channel %d.", port_base, irq_level, dma_chan);
#else
sprintf(info_msg, "NCR53c406a at 0x%x, IRQ %d, %s PIO mode.", port_base, irq_level, fast_pio ? "fast" : "slow");
#endif
return (present);
#if USE_DMA
err_free_irq:
if (irq_level)
free_irq(irq_level, shpnt);
#endif
err_free_scsi:
scsi_unregister(shpnt);
err_release:
release_region(port_base, 0x10);
return 0;
}
static int NCR53c406a_release(struct Scsi_Host *shost)
{
if (shost->irq)
free_irq(shost->irq, NULL);
#ifdef USE_DMA
if (shost->dma_channel != 0xff)
free_dma(shost->dma_channel);
#endif
if (shost->io_port && shost->n_io_port)
release_region(shost->io_port, shost->n_io_port);
scsi_unregister(shost);
return 0;
}
#ifndef MODULE
/* called from init/main.c */
static int __init NCR53c406a_setup(char *str)
{
static size_t setup_idx = 0;
size_t i;
int ints[4];
DEB(printk("NCR53c406a: Setup called\n");
);
if (setup_idx >= PORT_COUNT - 1) {
printk("NCR53c406a: Setup called too many times. Bad LILO params?\n");
return 0;
}
get_options(str, 4, ints);
if (ints[0] < 1 || ints[0] > 3) {
printk("NCR53c406a: Malformed command line\n");
printk("NCR53c406a: Usage: ncr53c406a=<PORTBASE>[,<IRQ>[,<FASTPIO>]]\n");
return 0;
}
for (i = 0; i < PORT_COUNT && !port_base; i++)
if (ports[i] == ints[1]) {
port_base = ints[1];
DEB(printk("NCR53c406a: Specified port_base 0x%x\n", port_base);
)
}
if (!port_base) {
printk("NCR53c406a: Invalid PORTBASE 0x%x specified\n", ints[1]);
return 0;
}
if (ints[0] > 1) {
if (ints[2] == 0) {
irq_level = 0;
DEB(printk("NCR53c406a: Specified irq %d\n", irq_level);
)
} else
for (i = 0; i < INTR_COUNT && irq_level < 0; i++)
if (intrs[i] == ints[2]) {
irq_level = ints[2];
DEB(printk("NCR53c406a: Specified irq %d\n", port_base);
)
}
if (irq_level < 0)
printk("NCR53c406a: Invalid IRQ %d specified\n", ints[2]);
}
if (ints[0] > 2)
fast_pio = ints[3];
DEB(printk("NCR53c406a: port_base=0x%x, irq=%d, fast_pio=%d\n", port_base, irq_level, fast_pio);)
return 1;
}
__setup("ncr53c406a=", NCR53c406a_setup);
#endif /* !MODULE */
static const char *NCR53c406a_info(struct Scsi_Host *SChost)
{
DEB(printk("NCR53c406a_info called\n"));
return (info_msg);
}
#if 0
static void wait_intr(void)
{
unsigned long i = jiffies + WATCHDOG;
while (time_after(i, jiffies) && !(inb(STAT_REG) & 0xe0)) { /* wait for a pseudo-interrupt */
cpu_relax();
barrier();
}
if (time_before_eq(i, jiffies)) { /* Timed out */
rtrc(0);
current_SC->result = DID_TIME_OUT << 16;
current_SC->SCp.phase = idle;
current_SC->scsi_done(current_SC);
return;
}
NCR53c406a_intr(NULL);
}
#endif
static int NCR53c406a_queue_lck(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
{
int i;
VDEB(printk("NCR53c406a_queue called\n"));
DEB(printk("cmd=%02x, cmd_len=%02x, target=%02x, lun=%02x, bufflen=%d\n", SCpnt->cmnd[0], SCpnt->cmd_len, SCpnt->target, SCpnt->lun, scsi_bufflen(SCpnt)));
#if 0
VDEB(for (i = 0; i < SCpnt->cmd_len; i++)
printk("cmd[%d]=%02x ", i, SCpnt->cmnd[i]));
VDEB(printk("\n"));
#endif
current_SC = SCpnt;
current_SC->scsi_done = done;
current_SC->SCp.phase = command_ph;
current_SC->SCp.Status = 0;
current_SC->SCp.Message = 0;
/* We are locked here already by the mid layer */
REG0;
outb(scmd_id(SCpnt), DEST_ID); /* set destination */
outb(FLUSH_FIFO, CMD_REG); /* reset the fifos */
for (i = 0; i < SCpnt->cmd_len; i++) {
outb(SCpnt->cmnd[i], SCSI_FIFO);
}
outb(SELECT_NO_ATN, CMD_REG);
rtrc(1);
return 0;
}
static DEF_SCSI_QCMD(NCR53c406a_queue)
static int NCR53c406a_host_reset(Scsi_Cmnd * SCpnt)
{
DEB(printk("NCR53c406a_reset called\n"));
spin_lock_irq(SCpnt->device->host->host_lock);
outb(C4_IMG, CONFIG4); /* Select reg set 0 */
outb(CHIP_RESET, CMD_REG);
outb(SCSI_NOP, CMD_REG); /* required after reset */
outb(SCSI_RESET, CMD_REG);
chip_init();
rtrc(2);
spin_unlock_irq(SCpnt->device->host->host_lock);
return SUCCESS;
}
static int NCR53c406a_biosparm(struct scsi_device *disk,
struct block_device *dev,
sector_t capacity, int *info_array)
{
int size;
DEB(printk("NCR53c406a_biosparm called\n"));
size = capacity;
info_array[0] = 64; /* heads */
info_array[1] = 32; /* sectors */
info_array[2] = size >> 11; /* cylinders */
if (info_array[2] > 1024) { /* big disk */
info_array[0] = 255;
info_array[1] = 63;
info_array[2] = size / (255 * 63);
}
return 0;
}
static irqreturn_t do_NCR53c406a_intr(int unused, void *dev_id)
{
unsigned long flags;
struct Scsi_Host *dev = dev_id;
spin_lock_irqsave(dev->host_lock, flags);
NCR53c406a_intr(dev_id);
spin_unlock_irqrestore(dev->host_lock, flags);
return IRQ_HANDLED;
}
static void NCR53c406a_intr(void *dev_id)
{
DEB(unsigned char fifo_size;
)
DEB(unsigned char seq_reg;
)
unsigned char status, int_reg;
#if USE_PIO
unsigned char pio_status;
struct scatterlist *sg;
int i;
#endif
VDEB(printk("NCR53c406a_intr called\n"));
#if USE_PIO
REG1;
pio_status = inb(PIO_STATUS);
#endif
REG0;
status = inb(STAT_REG);
DEB(seq_reg = inb(SEQ_REG));
int_reg = inb(INT_REG);
DEB(fifo_size = inb(FIFO_FLAGS) & 0x1f);
#if NCR53C406A_DEBUG
printk("status=%02x, seq_reg=%02x, int_reg=%02x, fifo_size=%02x", status, seq_reg, int_reg, fifo_size);
#if (USE_DMA)
printk("\n");
#else
printk(", pio=%02x\n", pio_status);
#endif /* USE_DMA */
#endif /* NCR53C406A_DEBUG */
if (int_reg & 0x80) { /* SCSI reset intr */
rtrc(3);
DEB(printk("NCR53c406a: reset intr received\n"));
current_SC->SCp.phase = idle;
current_SC->result = DID_RESET << 16;
current_SC->scsi_done(current_SC);
return;
}
#if USE_PIO
if (pio_status & 0x80) {
printk("NCR53C406A: Warning: PIO error!\n");
current_SC->SCp.phase = idle;
current_SC->result = DID_ERROR << 16;
current_SC->scsi_done(current_SC);
return;
}
#endif /* USE_PIO */
if (status & 0x20) { /* Parity error */
printk("NCR53c406a: Warning: parity error!\n");
current_SC->SCp.phase = idle;
current_SC->result = DID_PARITY << 16;
current_SC->scsi_done(current_SC);
return;
}
if (status & 0x40) { /* Gross error */
printk("NCR53c406a: Warning: gross error!\n");
current_SC->SCp.phase = idle;
current_SC->result = DID_ERROR << 16;
current_SC->scsi_done(current_SC);
return;
}
if (int_reg & 0x20) { /* Disconnect */
DEB(printk("NCR53c406a: disconnect intr received\n"));
if (current_SC->SCp.phase != message_in) { /* Unexpected disconnect */
current_SC->result = DID_NO_CONNECT << 16;
} else { /* Command complete, return status and message */
current_SC->result = (current_SC->SCp.Status & 0xff)
| ((current_SC->SCp.Message & 0xff) << 8) | (DID_OK << 16);
}
rtrc(0);
current_SC->SCp.phase = idle;
current_SC->scsi_done(current_SC);
return;
}
switch (status & 0x07) { /* scsi phase */
case 0x00: /* DATA-OUT */
if (int_reg & 0x10) { /* Target requesting info transfer */
rtrc(5);
current_SC->SCp.phase = data_out;
VDEB(printk("NCR53c406a: Data-Out phase\n"));
outb(FLUSH_FIFO, CMD_REG);
LOAD_DMA_COUNT(scsi_bufflen(current_SC)); /* Max transfer size */
#if USE_DMA /* No s/g support for DMA */
NCR53c406a_dma_write(scsi_sglist(current_SC),
scsdi_bufflen(current_SC));
#endif /* USE_DMA */
outb(TRANSFER_INFO | DMA_OP, CMD_REG);
#if USE_PIO
scsi_for_each_sg(current_SC, sg, scsi_sg_count(current_SC), i) {
NCR53c406a_pio_write(sg_virt(sg), sg->length);
}
REG0;
#endif /* USE_PIO */
}
break;
case 0x01: /* DATA-IN */
if (int_reg & 0x10) { /* Target requesting info transfer */
rtrc(6);
current_SC->SCp.phase = data_in;
VDEB(printk("NCR53c406a: Data-In phase\n"));
outb(FLUSH_FIFO, CMD_REG);
LOAD_DMA_COUNT(scsi_bufflen(current_SC)); /* Max transfer size */
#if USE_DMA /* No s/g support for DMA */
NCR53c406a_dma_read(scsi_sglist(current_SC),
scsdi_bufflen(current_SC));
#endif /* USE_DMA */
outb(TRANSFER_INFO | DMA_OP, CMD_REG);
#if USE_PIO
scsi_for_each_sg(current_SC, sg, scsi_sg_count(current_SC), i) {
NCR53c406a_pio_read(sg_virt(sg), sg->length);
}
REG0;
#endif /* USE_PIO */
}
break;
case 0x02: /* COMMAND */
current_SC->SCp.phase = command_ph;
printk("NCR53c406a: Warning: Unknown interrupt occurred in command phase!\n");
break;
case 0x03: /* STATUS */
rtrc(7);
current_SC->SCp.phase = status_ph;
VDEB(printk("NCR53c406a: Status phase\n"));
outb(FLUSH_FIFO, CMD_REG);
outb(INIT_CMD_COMPLETE, CMD_REG);
break;
case 0x04: /* Reserved */
case 0x05: /* Reserved */
printk("NCR53c406a: WARNING: Reserved phase!!!\n");
break;
case 0x06: /* MESSAGE-OUT */
DEB(printk("NCR53c406a: Message-Out phase\n"));
current_SC->SCp.phase = message_out;
outb(SET_ATN, CMD_REG); /* Reject the message */
outb(MSG_ACCEPT, CMD_REG);
break;
case 0x07: /* MESSAGE-IN */
rtrc(4);
VDEB(printk("NCR53c406a: Message-In phase\n"));
current_SC->SCp.phase = message_in;
current_SC->SCp.Status = inb(SCSI_FIFO);
current_SC->SCp.Message = inb(SCSI_FIFO);
VDEB(printk("SCSI FIFO size=%d\n", inb(FIFO_FLAGS) & 0x1f));
DEB(printk("Status = %02x Message = %02x\n", current_SC->SCp.Status, current_SC->SCp.Message));
if (current_SC->SCp.Message == SAVE_POINTERS || current_SC->SCp.Message == DISCONNECT) {
outb(SET_ATN, CMD_REG); /* Reject message */
DEB(printk("Discarding SAVE_POINTERS message\n"));
}
outb(MSG_ACCEPT, CMD_REG);
break;
}
}
#ifndef IRQ_LEV
static int irq_probe(void)
{
int irqs, irq;
unsigned long i;
inb(INT_REG); /* clear the interrupt register */
irqs = probe_irq_on();
/* Invalid command will cause an interrupt */
REG0;
outb(0xff, CMD_REG);
/* Wait for the interrupt to occur */
i = jiffies + WATCHDOG;
while (time_after(i, jiffies) && !(inb(STAT_REG) & 0x80))
barrier();
if (time_before_eq(i, jiffies)) { /* Timed out, must be hardware trouble */
probe_irq_off(irqs);
return -1;
}
irq = probe_irq_off(irqs);
/* Kick the chip */
outb(CHIP_RESET, CMD_REG);
outb(SCSI_NOP, CMD_REG);
chip_init();
return irq;
}
#endif /* IRQ_LEV */
static void chip_init(void)
{
REG1;
#if USE_DMA
outb(0x00, PIO_STATUS);
#else /* USE_PIO */
outb(0x01, PIO_STATUS);
#endif
outb(0x00, PIO_FLAG);
outb(C4_IMG, CONFIG4); /* REG0; */
outb(C3_IMG, CONFIG3);
outb(C2_IMG, CONFIG2);
outb(C1_IMG, CONFIG1);