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linux-next/drivers/scsi/NCR53c406a.c
Jeff Garzik f281233d3e SCSI host lock push-down 
Move the mid-layer's ->queuecommand() invocation from being locked
with the host lock to being unlocked to facilitate speeding up the
critical path for drivers who don't need this lock taken anyway.

The patch below presents a simple SCSI host lock push-down as an
equivalent transformation.  No locking or other behavior should change
with this patch.  All existing bugs and locking orders are preserved.

Additionally, add one parameter to queuecommand,
	struct Scsi_Host *
and remove one parameter from queuecommand,
	void (*done)(struct scsi_cmnd *)

Scsi_Host* is a convenient pointer that most host drivers need anyway,
and 'done' is redundant to struct scsi_cmnd->scsi_done.

Minimal code disturbance was attempted with this change.  Most drivers
needed only two one-line modifications for their host lock push-down.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-16 13:33:23 -08:00

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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);
outb(0x05, CLKCONV); /* clock conversion factor */
outb(0x9C, SRTIMOUT); /* Selection timeout */
outb(0x05, SYNCPRD); /* Synchronous transfer period */
outb(SYNC_MODE, SYNCOFF); /* synchronous mode */
}
static void __init calc_port_addr(void)
{
/* Control Register Set 0 */
TC_LSB = (port_base + 0x00);
TC_MSB = (port_base + 0x01);
SCSI_FIFO = (port_base + 0x02);
CMD_REG = (port_base + 0x03);
STAT_REG = (port_base + 0x04);
DEST_ID = (port_base + 0x04);
INT_REG = (port_base + 0x05);
SRTIMOUT = (port_base + 0x05);
SEQ_REG = (port_base + 0x06);
SYNCPRD = (port_base + 0x06);
FIFO_FLAGS = (port_base + 0x07);
SYNCOFF = (port_base + 0x07);
CONFIG1 = (port_base + 0x08);
CLKCONV = (port_base + 0x09);
/* TESTREG = (port_base+0x0A); */
CONFIG2 = (port_base + 0x0B);
CONFIG3 = (port_base + 0x0C);
CONFIG4 = (port_base + 0x0D);
TC_HIGH = (port_base + 0x0E);
/* FIFO_BOTTOM = (port_base+0x0F); */
/* Control Register Set 1 */
/* JUMPER_SENSE = (port_base+0x00); */
/* SRAM_PTR = (port_base+0x01); */
/* SRAM_DATA = (port_base+0x02); */
PIO_FIFO = (port_base + 0x04);
/* PIO_FIFO1 = (port_base+0x05); */
/* PIO_FIFO2 = (port_base+0x06); */
/* PIO_FIFO3 = (port_base+0x07); */
PIO_STATUS = (port_base + 0x08);
/* ATA_CMD = (port_base+0x09); */
/* ATA_ERR = (port_base+0x0A); */
PIO_FLAG = (port_base + 0x0B);
CONFIG5 = (port_base + 0x0D);
/* SIGNATURE = (port_base+0x0E); */
/* CONFIG6 = (port_base+0x0F); */
}
MODULE_LICENSE("GPL");
/* NOTE: scatter-gather support only works in PIO mode.
* Use SG_NONE if DMA mode is enabled!
*/
static struct scsi_host_template driver_template =
{
.proc_name = "NCR53c406a" /* proc_name */,
.name = "NCR53c406a" /* name */,
.detect = NCR53c406a_detect /* detect */,
.release = NCR53c406a_release,
.info = NCR53c406a_info /* info */,
.queuecommand = NCR53c406a_queue /* queuecommand */,
.eh_host_reset_handler = NCR53c406a_host_reset /* reset */,
.bios_param = NCR53c406a_biosparm /* biosparm */,
.can_queue = 1 /* can_queue */,
.this_id = 7 /* SCSI ID of the chip */,
.sg_tablesize = 32 /*SG_ALL*/ /*SG_NONE*/,
.cmd_per_lun = 1 /* commands per lun */,
.unchecked_isa_dma = 1 /* unchecked_isa_dma */,
.use_clustering = ENABLE_CLUSTERING,
};
#include "scsi_module.c"
/*
* Overrides for Emacs so that we get a uniform tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-indent-level: 4
* c-brace-imaginary-offset: 0
* c-brace-offset: -4
* c-argdecl-indent: 4
* c-label-offset: -4
* c-continued-statement-offset: 4
* c-continued-brace-offset: 0
* indent-tabs-mode: nil
* tab-width: 8
* End:
*/
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