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linux-next/drivers/scsi/mac_esp.c
Maciej W. Rozycki 4df4db5c6c [TC] dec_esp: Driver model for the PMAZ-A 
This is a set of changes that converts the PMAZ-A support to the driver model.

The use of the driver model required switching to the hotplug SCSI
initialization model, which in turn required a change to the core NCR53C9x
driver.  I decided not to break all the frontend drivers and introduced an
additional parameter for esp_allocate() to select between the old and the new
model.  I hope this is OK, but I would be fine with converting NCR53C9x to the
new model unconditionally as long as I do not have to fix all the other
frontends (OK, perhaps I could do some of them ;-) ).

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2007-02-09 16:23:17 +00:00

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/*
* 68k mac 53c9[46] scsi driver
*
* copyright (c) 1998, David Weis weisd3458@uni.edu
*
* debugging on Quadra 800 and 660AV Michael Schmitz, Dave Kilzer 7/98
*
* based loosely on cyber_esp.c
*/
/* these are unused for now */
#define myreadl(addr) (*(volatile unsigned int *) (addr))
#define mywritel(b, addr) ((*(volatile unsigned int *) (addr)) = (b))
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include "NCR53C9x.h"
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/macints.h>
#include <asm/machw.h>
#include <asm/mac_via.h>
#include <asm/pgtable.h>
#include <asm/macintosh.h>
/* #define DEBUG_MAC_ESP */
extern void esp_handle(struct NCR_ESP *esp);
extern void mac_esp_intr(int irq, void *dev_id);
static int dma_bytes_sent(struct NCR_ESP * esp, int fifo_count);
static int dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd *sp);
static void dma_dump_state(struct NCR_ESP * esp);
static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length);
static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length);
static void dma_ints_off(struct NCR_ESP * esp);
static void dma_ints_on(struct NCR_ESP * esp);
static int dma_irq_p(struct NCR_ESP * esp);
static int dma_irq_p_quick(struct NCR_ESP * esp);
static void dma_led_off(struct NCR_ESP * esp);
static void dma_led_on(struct NCR_ESP *esp);
static int dma_ports_p(struct NCR_ESP *esp);
static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write);
static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write);
static int esp_dafb_dma_irq_p(struct NCR_ESP * espdev);
static int esp_iosb_dma_irq_p(struct NCR_ESP * espdev);
static volatile unsigned char cmd_buffer[16];
/* This is where all commands are put
* before they are transferred to the ESP chip
* via PIO.
*/
static int esp_initialized = 0;
static int setup_num_esps = -1;
static int setup_disconnect = -1;
static int setup_nosync = -1;
static int setup_can_queue = -1;
static int setup_cmd_per_lun = -1;
static int setup_sg_tablesize = -1;
#ifdef SUPPORT_TAGS
static int setup_use_tagged_queuing = -1;
#endif
static int setup_hostid = -1;
/*
* Experimental ESP inthandler; check macints.c to make sure dev_id is
* set up properly!
*/
void mac_esp_intr(int irq, void *dev_id)
{
struct NCR_ESP *esp = (struct NCR_ESP *) dev_id;
int irq_p = 0;
/* Handle the one ESP interrupt showing at this IRQ level. */
if(((esp)->irq & 0xff) == irq) {
/*
* Debug ..
*/
irq_p = esp->dma_irq_p(esp);
printk("mac_esp: irq_p %x current %p disconnected %p\n",
irq_p, esp->current_SC, esp->disconnected_SC);
/*
* Mac: if we're here, it's an ESP interrupt for sure!
*/
if((esp->current_SC || esp->disconnected_SC)) {
esp->dma_ints_off(esp);
ESPIRQ(("I%d(", esp->esp_id));
esp_handle(esp);
ESPIRQ((")"));
esp->dma_ints_on(esp);
}
}
}
/*
* Debug hooks; use for playing with the interrupt flag testing and interrupt
* acknowledge on the various machines
*/
void scsi_esp_polled(int irq, void *dev_id)
{
if (esp_initialized == 0)
return;
mac_esp_intr(irq, dev_id);
}
void fake_intr(int irq, void *dev_id)
{
#ifdef DEBUG_MAC_ESP
printk("mac_esp: got irq\n");
#endif
mac_esp_intr(irq, dev_id);
}
irqreturn_t fake_drq(int irq, void *dev_id)
{
printk("mac_esp: got drq\n");
return IRQ_HANDLED;
}
#define DRIVER_SETUP
/*
* Function : mac_esp_setup(char *str)
*
* Purpose : booter command line initialization of the overrides array,
*
* Inputs : str - parameters, separated by commas.
*
* Currently unused in the new driver; need to add settable parameters to the
* detect function.
*
*/
static int __init mac_esp_setup(char *str) {
#ifdef DRIVER_SETUP
/* Format of mac53c9x parameter is:
* mac53c9x=<num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
* Negative values mean don't change.
*/
char *this_opt;
long opt;
this_opt = strsep (&str, ",");
if(this_opt) {
opt = simple_strtol( this_opt, NULL, 0 );
if (opt >= 0 && opt <= 2)
setup_num_esps = opt;
else if (opt > 2)
printk( "mac_esp_setup: invalid number of hosts %ld !\n", opt );
this_opt = strsep (&str, ",");
}
if(this_opt) {
opt = simple_strtol( this_opt, NULL, 0 );
if (opt > 0)
setup_disconnect = opt;
this_opt = strsep (&str, ",");
}
if(this_opt) {
opt = simple_strtol( this_opt, NULL, 0 );
if (opt >= 0)
setup_nosync = opt;
this_opt = strsep (&str, ",");
}
if(this_opt) {
opt = simple_strtol( this_opt, NULL, 0 );
if (opt > 0)
setup_can_queue = opt;
this_opt = strsep (&str, ",");
}
if(this_opt) {
opt = simple_strtol( this_opt, NULL, 0 );
if (opt > 0)
setup_cmd_per_lun = opt;
this_opt = strsep (&str, ",");
}
if(this_opt) {
opt = simple_strtol( this_opt, NULL, 0 );
if (opt >= 0) {
setup_sg_tablesize = opt;
/* Must be <= SG_ALL (255) */
if (setup_sg_tablesize > SG_ALL)
setup_sg_tablesize = SG_ALL;
}
this_opt = strsep (&str, ",");
}
if(this_opt) {
opt = simple_strtol( this_opt, NULL, 0 );
/* Must be between 0 and 7 */
if (opt >= 0 && opt <= 7)
setup_hostid = opt;
else if (opt > 7)
printk( "mac_esp_setup: invalid host ID %ld !\n", opt);
this_opt = strsep (&str, ",");
}
#ifdef SUPPORT_TAGS
if(this_opt) {
opt = simple_strtol( this_opt, NULL, 0 );
if (opt >= 0)
setup_use_tagged_queuing = !!opt;
}
#endif
#endif
return 1;
}
__setup("mac53c9x=", mac_esp_setup);
/*
* ESP address 'detection'
*/
unsigned long get_base(int chip_num)
{
/*
* using the chip_num and mac model, figure out where the
* chips are mapped
*/
unsigned long io_base = 0x50f00000;
unsigned int second_offset = 0x402;
unsigned long scsi_loc = 0;
switch (macintosh_config->scsi_type) {
/* 950, 900, 700 */
case MAC_SCSI_QUADRA2:
scsi_loc = io_base + 0xf000 + ((chip_num == 0) ? 0 : second_offset);
break;
/* av's */
case MAC_SCSI_QUADRA3:
scsi_loc = io_base + 0x18000 + ((chip_num == 0) ? 0 : second_offset);
break;
/* most quadra/centris models are like this */
case MAC_SCSI_QUADRA:
scsi_loc = io_base + 0x10000;
break;
default:
printk("mac_esp: get_base: hit default!\n");
scsi_loc = io_base + 0x10000;
break;
} /* switch */
printk("mac_esp: io base at 0x%lx\n", scsi_loc);
return scsi_loc;
}
/*
* Model dependent ESP setup
*/
int mac_esp_detect(struct scsi_host_template * tpnt)
{
int quick = 0;
int chipnum, chipspresent = 0;
#if 0
unsigned long timeout;
#endif
if (esp_initialized > 0)
return -ENODEV;
/* what do we have in this machine... */
if (MACHW_PRESENT(MAC_SCSI_96)) {
chipspresent ++;
}
if (MACHW_PRESENT(MAC_SCSI_96_2)) {
chipspresent ++;
}
/* number of ESPs present ? */
if (setup_num_esps >= 0) {
if (chipspresent >= setup_num_esps)
chipspresent = setup_num_esps;
else
printk("mac_esp_detect: num_hosts detected %d setup %d \n",
chipspresent, setup_num_esps);
}
/* TODO: add disconnect / nosync flags */
/* setup variables */
tpnt->can_queue =
(setup_can_queue > 0) ? setup_can_queue : 7;
tpnt->cmd_per_lun =
(setup_cmd_per_lun > 0) ? setup_cmd_per_lun : 1;
tpnt->sg_tablesize =
(setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_ALL;
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 = DEFAULT_USE_TAGGED_QUEUING;
#endif
for (chipnum = 0; chipnum < chipspresent; chipnum ++) {
struct NCR_ESP * esp;
esp = esp_allocate(tpnt, NULL, 0);
esp->eregs = (struct ESP_regs *) get_base(chipnum);
esp->dma_irq_p = &esp_dafb_dma_irq_p;
if (chipnum == 0) {
if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) {
/* most machines except those below :-) */
quick = 1;
esp->dma_irq_p = &esp_iosb_dma_irq_p;
} else if (macintosh_config->scsi_type == MAC_SCSI_QUADRA3) {
/* mostly av's */
quick = 0;
} else {
/* q950, 900, 700 */
quick = 1;
out_be32(0xf9800024, 0x1d1);
esp->dregs = (void *) 0xf9800024;
}
} else { /* chipnum */
quick = 1;
out_be32(0xf9800028, 0x1d1);
esp->dregs = (void *) 0xf9800028;
} /* chipnum == 0 */
/* use pio for command bytes; pio for message/data: TBI */
esp->do_pio_cmds = 1;
/* Set the command buffer */
esp->esp_command = (volatile unsigned char*) cmd_buffer;
esp->esp_command_dvma = (__u32) cmd_buffer;
/* various functions */
esp->dma_bytes_sent = &dma_bytes_sent;
esp->dma_can_transfer = &dma_can_transfer;
esp->dma_dump_state = &dma_dump_state;
esp->dma_init_read = NULL;
esp->dma_init_write = NULL;
esp->dma_ints_off = &dma_ints_off;
esp->dma_ints_on = &dma_ints_on;
esp->dma_ports_p = &dma_ports_p;
/* Optional functions */
esp->dma_barrier = NULL;
esp->dma_drain = NULL;
esp->dma_invalidate = NULL;
esp->dma_irq_entry = NULL;
esp->dma_irq_exit = NULL;
esp->dma_led_on = NULL;
esp->dma_led_off = NULL;
esp->dma_poll = NULL;
esp->dma_reset = NULL;
/* SCSI chip speed */
/* below esp->cfreq = 40000000; */
if (quick) {
/* 'quick' means there's handshake glue logic like in the 5380 case */
esp->dma_setup = &dma_setup_quick;
} else {
esp->dma_setup = &dma_setup;
}
if (chipnum == 0) {
esp->irq = IRQ_MAC_SCSI;
request_irq(IRQ_MAC_SCSI, esp_intr, 0, "Mac ESP SCSI", esp->ehost);
#if 0 /* conflicts with IOP ADB */
request_irq(IRQ_MAC_SCSIDRQ, fake_drq, 0, "Mac ESP DRQ", esp->ehost);
#endif
if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) {
esp->cfreq = 16500000;
} else {
esp->cfreq = 25000000;
}
} else { /* chipnum == 1 */
esp->irq = IRQ_MAC_SCSIDRQ;
#if 0 /* conflicts with IOP ADB */
request_irq(IRQ_MAC_SCSIDRQ, esp_intr, 0, "Mac ESP SCSI 2", esp->ehost);
#endif
esp->cfreq = 25000000;
}
if (quick) {
printk("esp: using quick version\n");
}
printk("esp: addr at 0x%p\n", esp->eregs);
esp->scsi_id = 7;
esp->diff = 0;
esp_initialize(esp);
} /* for chipnum */
if (chipspresent)
printk("\nmac_esp: %d esp controllers found\n", chipspresent);
esp_initialized = chipspresent;
return chipspresent;
}
static int mac_esp_release(struct Scsi_Host *shost)
{
if (shost->irq)
free_irq(shost->irq, NULL);
if (shost->io_port && shost->n_io_port)
release_region(shost->io_port, shost->n_io_port);
scsi_unregister(shost);
return 0;
}
/*
* I've been wondering what this is supposed to do, for some time. Talking
* to Allen Briggs: These machines have an extra register someplace where the
* DRQ pin of the ESP can be monitored. That isn't useful for determining
* anything else (such as reselect interrupt or other magic) though.
* Maybe make the semantics should be changed like
* if (esp->current_SC)
* ... check DRQ flag ...
* else
* ... disconnected, check pending VIA interrupt ...
*
* There's a problem with using the dabf flag or mac_irq_pending() here: both
* seem to return 1 even though no interrupt is currently pending, resulting
* in esp_exec_cmd() holding off the next command, and possibly infinite loops
* in esp_intr().
* Short term fix: just use esp_status & ESP_STAT_INTR here, as long as we
* use simple PIO. The DRQ status will be important when implementing pseudo
* DMA mode (set up ESP transfer count, return, do a batch of bytes in PIO or
* 'hardware handshake' mode upon DRQ).
* If you plan on changing this (i.e. to save the esp_status register access in
* favor of a VIA register access or a shadow register for the IFR), make sure
* to try a debug version of this first to monitor what registers would be a good
* indicator of the ESP interrupt.
*/
static int esp_dafb_dma_irq_p(struct NCR_ESP * esp)
{
unsigned int ret;
int sreg = esp_read(esp->eregs->esp_status);
#ifdef DEBUG_MAC_ESP
printk("mac_esp: esp_dafb_dma_irq_p dafb %d irq %d\n",
readl(esp->dregs), mac_irq_pending(IRQ_MAC_SCSI));
#endif
sreg &= ESP_STAT_INTR;
/*
* maybe working; this is essentially what's used for iosb_dma_irq_p
*/
if (sreg)
return 1;
else
return 0;
/*
* didn't work ...
*/
#if 0
if (esp->current_SC)
ret = readl(esp->dregs) & 0x200;
else if (esp->disconnected_SC)
ret = 1; /* sreg ?? */
else
ret = mac_irq_pending(IRQ_MAC_SCSI);
return(ret);
#endif
}
/*
* See above: testing mac_irq_pending always returned 8 (SCSI IRQ) regardless
* of the actual ESP status.
*/
static int esp_iosb_dma_irq_p(struct NCR_ESP * esp)
{
int ret = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ);
int sreg = esp_read(esp->eregs->esp_status);
#ifdef DEBUG_MAC_ESP
printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n",
mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI),
sreg, esp->current_SC, esp->disconnected_SC);
#endif
sreg &= ESP_STAT_INTR;
if (sreg)
return (sreg);
else
return 0;
}
/*
* This seems to be OK for PIO at least ... usually 0 after PIO.
*/
static int dma_bytes_sent(struct NCR_ESP * esp, int fifo_count)
{
#ifdef DEBUG_MAC_ESP
printk("mac_esp: dma bytes sent = %x\n", fifo_count);
#endif
return fifo_count;
}
/*
* dma_can_transfer is used to switch between DMA and PIO, if DMA (pseudo)
* is ever implemented. Returning 0 here will use PIO.
*/
static int dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd * sp)
{
unsigned long sz = sp->SCp.this_residual;
#if 0 /* no DMA yet; make conditional */
if (sz > 0x10000000) {
sz = 0x10000000;
}
printk("mac_esp: dma can transfer = 0lx%x\n", sz);
#else
#ifdef DEBUG_MAC_ESP
printk("mac_esp: pio to transfer = %ld\n", sz);
#endif
sz = 0;
#endif
return sz;
}
/*
* Not yet ...
*/
static void dma_dump_state(struct NCR_ESP * esp)
{
#ifdef DEBUG_MAC_ESP
printk("mac_esp: dma_dump_state: called\n");
#endif
#if 0
ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
esp->esp_id, ((struct mac_dma_registers *)
(esp->dregs))->cond_reg));
#endif
}
/*
* DMA setup: should be used to set up the ESP transfer count for pseudo
* DMA transfers; need a DRQ transfer function to do the actual transfer
*/
static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length)
{
printk("mac_esp: dma_init_read\n");
}
static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length)
{
printk("mac_esp: dma_init_write\n");
}
static void dma_ints_off(struct NCR_ESP * esp)
{
disable_irq(esp->irq);
}
static void dma_ints_on(struct NCR_ESP * esp)
{
enable_irq(esp->irq);
}
/*
* generic dma_irq_p(), unused
*/
static int dma_irq_p(struct NCR_ESP * esp)
{
int i = esp_read(esp->eregs->esp_status);
#ifdef DEBUG_MAC_ESP
printk("mac_esp: dma_irq_p status %d\n", i);
#endif
return (i & ESP_STAT_INTR);
}
static int dma_irq_p_quick(struct NCR_ESP * esp)
{
/*
* Copied from iosb_dma_irq_p()
*/
int ret = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ);
int sreg = esp_read(esp->eregs->esp_status);
#ifdef DEBUG_MAC_ESP
printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n",
mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI),
sreg, esp->current_SC, esp->disconnected_SC);
#endif
sreg &= ESP_STAT_INTR;
if (sreg)
return (sreg);
else
return 0;
}
static void dma_led_off(struct NCR_ESP * esp)
{
#ifdef DEBUG_MAC_ESP
printk("mac_esp: dma_led_off: called\n");
#endif
}
static void dma_led_on(struct NCR_ESP * esp)
{
#ifdef DEBUG_MAC_ESP
printk("mac_esp: dma_led_on: called\n");
#endif
}
static int dma_ports_p(struct NCR_ESP * esp)
{
return 0;
}
static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write)
{
#ifdef DEBUG_MAC_ESP
printk("mac_esp: dma_setup\n");
#endif
if (write) {
dma_init_read(esp, (char *) addr, count);
} else {
dma_init_write(esp, (char *) addr, count);
}
}
static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write)
{
#ifdef DEBUG_MAC_ESP
printk("mac_esp: dma_setup_quick\n");
#endif
}
static struct scsi_host_template driver_template = {
.proc_name = "mac_esp",
.name = "Mac 53C9x SCSI",
.detect = mac_esp_detect,
.slave_alloc = esp_slave_alloc,
.slave_destroy = esp_slave_destroy,
.release = mac_esp_release,
.info = esp_info,
.queuecommand = esp_queue,
.eh_abort_handler = esp_abort,
.eh_bus_reset_handler = esp_reset,
.can_queue = 7,
.this_id = 7,
.sg_tablesize = SG_ALL,
.cmd_per_lun = 1,
.use_clustering = DISABLE_CLUSTERING
};
#include "scsi_module.c"
MODULE_LICENSE("GPL");
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