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|
/*
* Generic Macintosh NCR5380 driver
*
* Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
*
* derived in part from:
*/
/*
* Generic Generic NCR5380 driver
*
* Copyright 1995, Russell King
*/
#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_via.h>
#include <scsi/scsi_host.h>
/* Definitions for the core NCR5380 driver. */
#define PSEUDO_DMA
#define NCR5380_implementation_fields /* none */
#define NCR5380_local_declare() struct Scsi_Host *_instance
#define NCR5380_setup(instance) _instance = instance
#define NCR5380_read(reg) macscsi_read(_instance, reg)
#define NCR5380_write(reg, value) macscsi_write(_instance, reg, value)
#define NCR5380_pread macscsi_pread
#define NCR5380_pwrite macscsi_pwrite
#define NCR5380_intr macscsi_intr
#define NCR5380_queue_command macscsi_queue_command
#define NCR5380_abort macscsi_abort
#define NCR5380_bus_reset macscsi_bus_reset
#define NCR5380_info macscsi_info
#define NCR5380_show_info macscsi_show_info
#define NCR5380_write_info macscsi_write_info
#include "NCR5380.h"
#define RESET_BOOT
#ifdef RESET_BOOT
static void mac_scsi_reset_boot(struct Scsi_Host *instance);
#endif
static int setup_called = 0;
static int setup_can_queue = -1;
static int setup_cmd_per_lun = -1;
static int setup_sg_tablesize = -1;
static int setup_use_pdma = -1;
#ifdef SUPPORT_TAGS
static int setup_use_tagged_queuing = -1;
#endif
static int setup_hostid = -1;
/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
* we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
* need ten times the standard value... */
#define TOSHIBA_DELAY
#ifdef TOSHIBA_DELAY
#define AFTER_RESET_DELAY (5*HZ/2)
#else
#define AFTER_RESET_DELAY (HZ/2)
#endif
static volatile unsigned char *mac_scsi_regp = NULL;
static volatile unsigned char *mac_scsi_drq = NULL;
static volatile unsigned char *mac_scsi_nodrq = NULL;
/*
* NCR 5380 register access functions
*/
static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
{
return in_8(instance->io_port + (reg<<4));
}
static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
{
out_8(instance->io_port + (reg<<4), value);
}
/*
* Function : mac_scsi_setup(char *str)
*
* Purpose : booter command line initialization of the overrides array,
*
* Inputs : str - comma delimited list of options
*
*/
static int __init mac_scsi_setup(char *str) {
int ints[7];
(void)get_options( str, ARRAY_SIZE(ints), ints);
if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
printk(KERN_WARNING "scsi: <mac5380>"
" Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
return 0;
}
if (ints[0] >= 1) {
if (ints[1] > 0)
/* no limits on this, just > 0 */
setup_can_queue = ints[1];
}
if (ints[0] >= 2) {
if (ints[2] > 0)
setup_cmd_per_lun = ints[2];
}
if (ints[0] >= 3) {
if (ints[3] >= 0) {
setup_sg_tablesize = ints[3];
/* Must be <= SG_ALL (255) */
if (setup_sg_tablesize > SG_ALL)
setup_sg_tablesize = SG_ALL;
}
}
if (ints[0] >= 4) {
/* Must be between 0 and 7 */
if (ints[4] >= 0 && ints[4] <= 7)
setup_hostid = ints[4];
else if (ints[4] > 7)
printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
}
#ifdef SUPPORT_TAGS
if (ints[0] >= 5) {
if (ints[5] >= 0)
setup_use_tagged_queuing = !!ints[5];
}
if (ints[0] == 6) {
if (ints[6] >= 0)
setup_use_pdma = ints[6];
}
#else
if (ints[0] == 5) {
if (ints[5] >= 0)
setup_use_pdma = ints[5];
}
#endif /* SUPPORT_TAGS */
return 1;
}
__setup("mac5380=", mac_scsi_setup);
/*
* Function : int macscsi_detect(struct scsi_host_template * tpnt)
*
* Purpose : initializes mac NCR5380 driver based on the
* command line / compile time port and irq definitions.
*
* Inputs : tpnt - template for this SCSI adapter.
*
* Returns : 1 if a host adapter was found, 0 if not.
*
*/
int __init macscsi_detect(struct scsi_host_template * tpnt)
{
static int called = 0;
int flags = 0;
struct Scsi_Host *instance;
if (!MACH_IS_MAC || called)
return( 0 );
if (macintosh_config->scsi_type != MAC_SCSI_OLD)
return( 0 );
if (setup_can_queue > 0)
tpnt->can_queue = setup_can_queue;
if (setup_cmd_per_lun > 0)
tpnt->cmd_per_lun = setup_cmd_per_lun;
if (setup_sg_tablesize >= 0)
tpnt->sg_tablesize = setup_sg_tablesize;
if (setup_hostid >= 0)
tpnt->this_id = setup_hostid;
else {
/* use 7 as default */
tpnt->this_id = 7;
}
#ifdef SUPPORT_TAGS
if (setup_use_tagged_queuing < 0)
setup_use_tagged_queuing = 0;
#endif
/* Once we support multiple 5380s (e.g. DuoDock) we'll do
something different here */
instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
if (instance == NULL)
return 0;
if (macintosh_config->ident == MAC_MODEL_IIFX) {
mac_scsi_regp = via1+0x8000;
mac_scsi_drq = via1+0xE000;
mac_scsi_nodrq = via1+0xC000;
/* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
flags = FLAG_NO_PSEUDO_DMA;
} else {
mac_scsi_regp = via1+0x10000;
mac_scsi_drq = via1+0x6000;
mac_scsi_nodrq = via1+0x12000;
}
if (! setup_use_pdma)
flags = FLAG_NO_PSEUDO_DMA;
instance->io_port = (unsigned long) mac_scsi_regp;
instance->irq = IRQ_MAC_SCSI;
#ifdef RESET_BOOT
mac_scsi_reset_boot(instance);
#endif
NCR5380_init(instance, flags);
instance->n_io_port = 255;
if (instance->irq != NO_IRQ)
if (request_irq(instance->irq, NCR5380_intr, 0, "ncr5380", instance)) {
printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
instance->host_no, instance->irq);
instance->irq = NO_IRQ;
}
called = 1;
return 1;
}
int macscsi_release (struct Scsi_Host *shpnt)
{
if (shpnt->irq != NO_IRQ)
free_irq(shpnt->irq, shpnt);
NCR5380_exit(shpnt);
return 0;
}
#ifdef RESET_BOOT
/*
* Our 'bus reset on boot' function
*/
static void mac_scsi_reset_boot(struct Scsi_Host *instance)
{
unsigned long end;
NCR5380_local_declare();
NCR5380_setup(instance);
/*
* Do a SCSI reset to clean up the bus during initialization. No messing
* with the queues, interrupts, or locks necessary here.
*/
printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
/* get in phase */
NCR5380_write( TARGET_COMMAND_REG,
PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
/* assert RST */
NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
/* The min. reset hold time is 25us, so 40us should be enough */
udelay( 50 );
/* reset RST and interrupt */
NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
NCR5380_read( RESET_PARITY_INTERRUPT_REG );
for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
barrier();
printk(KERN_INFO " done\n" );
}
#endif
/*
Pseudo-DMA: (Ove Edlund)
The code attempts to catch bus errors that occur if one for example
"trips over the cable".
XXX: Since bus errors in the PDMA routines never happen on my
computer, the bus error code is untested.
If the code works as intended, a bus error results in Pseudo-DMA
beeing disabled, meaning that the driver switches to slow handshake.
If bus errors are NOT extremely rare, this has to be changed.
*/
#define CP_IO_TO_MEM(s,d,len) \
__asm__ __volatile__ \
(" cmp.w #4,%2\n" \
" bls 8f\n" \
" move.w %1,%%d0\n" \
" neg.b %%d0\n" \
" and.w #3,%%d0\n" \
" sub.w %%d0,%2\n" \
" bra 2f\n" \
" 1: move.b (%0),(%1)+\n" \
" 2: dbf %%d0,1b\n" \
" move.w %2,%%d0\n" \
" lsr.w #5,%%d0\n" \
" bra 4f\n" \
" 3: move.l (%0),(%1)+\n" \
"31: move.l (%0),(%1)+\n" \
"32: move.l (%0),(%1)+\n" \
"33: move.l (%0),(%1)+\n" \
"34: move.l (%0),(%1)+\n" \
"35: move.l (%0),(%1)+\n" \
"36: move.l (%0),(%1)+\n" \
"37: move.l (%0),(%1)+\n" \
" 4: dbf %%d0,3b\n" \
" move.w %2,%%d0\n" \
" lsr.w #2,%%d0\n" \
" and.w #7,%%d0\n" \
" bra 6f\n" \
" 5: move.l (%0),(%1)+\n" \
" 6: dbf %%d0,5b\n" \
" and.w #3,%2\n" \
" bra 8f\n" \
" 7: move.b (%0),(%1)+\n" \
" 8: dbf %2,7b\n" \
" moveq.l #0, %2\n" \
" 9: \n" \
".section .fixup,\"ax\"\n" \
" .even\n" \
"90: moveq.l #1, %2\n" \
" jra 9b\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 1b,90b\n" \
" .long 3b,90b\n" \
" .long 31b,90b\n" \
" .long 32b,90b\n" \
" .long 33b,90b\n" \
" .long 34b,90b\n" \
" .long 35b,90b\n" \
" .long 36b,90b\n" \
" .long 37b,90b\n" \
" .long 5b,90b\n" \
" .long 7b,90b\n" \
".previous" \
: "=a"(s), "=a"(d), "=d"(len) \
: "0"(s), "1"(d), "2"(len) \
: "d0")
static int macscsi_pread (struct Scsi_Host *instance,
unsigned char *dst, int len)
{
unsigned char *d;
volatile unsigned char *s;
NCR5380_local_declare();
NCR5380_setup(instance);
s = mac_scsi_drq+0x60;
d = dst;
/* These conditions are derived from MacOS */
while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
&& !(NCR5380_read(STATUS_REG) & SR_REQ))
;
if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
&& (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
printk(KERN_ERR "Error in macscsi_pread\n");
return -1;
}
CP_IO_TO_MEM(s, d, len);
if (len != 0) {
printk(KERN_NOTICE "Bus error in macscsi_pread\n");
return -1;
}
return 0;
}
#define CP_MEM_TO_IO(s,d,len) \
__asm__ __volatile__ \
(" cmp.w #4,%2\n" \
" bls 8f\n" \
" move.w %0,%%d0\n" \
" neg.b %%d0\n" \
" and.w #3,%%d0\n" \
" sub.w %%d0,%2\n" \
" bra 2f\n" \
" 1: move.b (%0)+,(%1)\n" \
" 2: dbf %%d0,1b\n" \
" move.w %2,%%d0\n" \
" lsr.w #5,%%d0\n" \
" bra 4f\n" \
" 3: move.l (%0)+,(%1)\n" \
"31: move.l (%0)+,(%1)\n" \
"32: move.l (%0)+,(%1)\n" \
"33: move.l (%0)+,(%1)\n" \
"34: move.l (%0)+,(%1)\n" \
"35: move.l (%0)+,(%1)\n" \
"36: move.l (%0)+,(%1)\n" \
"37: move.l (%0)+,(%1)\n" \
" 4: dbf %%d0,3b\n" \
" move.w %2,%%d0\n" \
" lsr.w #2,%%d0\n" \
" and.w #7,%%d0\n" \
" bra 6f\n" \
" 5: move.l (%0)+,(%1)\n" \
" 6: dbf %%d0,5b\n" \
" and.w #3,%2\n" \
" bra 8f\n" \
" 7: move.b (%0)+,(%1)\n" \
" 8: dbf %2,7b\n" \
" moveq.l #0, %2\n" \
" 9: \n" \
".section .fixup,\"ax\"\n" \
" .even\n" \
"90: moveq.l #1, %2\n" \
" jra 9b\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 4\n" \
" .long 1b,90b\n" \
" .long 3b,90b\n" \
" .long 31b,90b\n" \
" .long 32b,90b\n" \
" .long 33b,90b\n" \
" .long 34b,90b\n" \
" .long 35b,90b\n" \
" .long 36b,90b\n" \
" .long 37b,90b\n" \
" .long 5b,90b\n" \
" .long 7b,90b\n" \
".previous" \
: "=a"(s), "=a"(d), "=d"(len) \
: "0"(s), "1"(d), "2"(len) \
: "d0")
static int macscsi_pwrite (struct Scsi_Host *instance,
unsigned char *src, int len)
{
unsigned char *s;
volatile unsigned char *d;
NCR5380_local_declare();
NCR5380_setup(instance);
s = src;
d = mac_scsi_drq;
/* These conditions are derived from MacOS */
while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
&& (!(NCR5380_read(STATUS_REG) & SR_REQ)
|| (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
;
if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
printk(KERN_ERR "Error in macscsi_pwrite\n");
return -1;
}
CP_MEM_TO_IO(s, d, len);
if (len != 0) {
printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
return -1;
}
return 0;
}
#include "NCR5380.c"
static struct scsi_host_template driver_template = {
.proc_name = "Mac5380",
.show_info = macscsi_show_info,
.write_info = macscsi_write_info,
.name = "Macintosh NCR5380 SCSI",
.detect = macscsi_detect,
.release = macscsi_release,
.info = macscsi_info,
.queuecommand = macscsi_queue_command,
.eh_abort_handler = macscsi_abort,
.eh_bus_reset_handler = macscsi_bus_reset,
.can_queue = 16,
.this_id = 7,
.sg_tablesize = SG_ALL,
.cmd_per_lun = 2,
.use_clustering = DISABLE_CLUSTERING
};
#include "scsi_module.c"
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