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* Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
*
* Adapted from mac_scsinew.c:
*/
/*
* Generic Macintosh NCR5380 driver
*
* Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
*
* derived in part from:
*/
/*
* Generic Generic NCR5380 driver
*
* Copyright 1995, Russell King
*
* ALPHA RELEASE 1.
*
* For more information, please consult
*
* NCR 5380 Family
* SCSI Protocol Controller
* Databook
*
* NCR Microelectronics
* 1635 Aeroplaza Drive
* Colorado Springs, CO 80916
* 1+ (719) 578-3400
* 1+ (800) 334-5454
*/
/*
* This is from mac_scsi.h, but hey, maybe this is usefull for Sun3 too! :)
*
* Options :
*
* PARITY - enable parity checking. Not supported.
*
* SCSI2 - enable support for SCSI-II tagged queueing. Untested.
*
* USLEEP - enable support for devices that don't disconnect. Untested.
*/
/*
* $Log: mac_NCR5380.c,v $
*/
#define AUTOSENSE
#if 0
#define PSEUDO_DMA
#endif
#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/sched.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/blk.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sun3ints.h>
#include "scsi.h"
#include "hosts.h"
#include "sun3_scsi.h"
#include "NCR5380.h"
#include "constants.h"
#if 0
#define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
#define NCR_TIMEOUT 100
#else
#define NDEBUG (NDEBUG_ABORT)
#endif
#define USE_WRAPPER
#define RESET_BOOT
#define DRIVER_SETUP
/*
* BUG can be used to trigger a strange code-size related hang on 2.1 kernels
*/
#ifdef BUG
#undef RESET_BOOT
#undef DRIVER_SETUP
#endif
#define ENABLE_IRQ() sun3_enable_irq( IRQ_SUN3_SCSI );
#define DISABLE_IRQ() sun3_enable_irq( IRQ_SUN3_SCSI );
/* extern void via_scsi_clear(void); */
static void scsi_sun3_intr(int irq, void *dummy, struct pt_regs *fp);
static char sun3scsi_read(struct Scsi_Host *instance, int reg);
static void sun3scsi_write(struct Scsi_Host *instance, int reg, int value);
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;
static int polled_scsi_on = 0;
#define AFTER_RESET_DELAY (HZ/2)
static volatile unsigned char *sun3_scsi_regp = IOBASE_SUN3_SCSI;
/*
static volatile unsigned char *sun3_scsi_drq = NULL;
static volatile unsigned char *sun3_scsi_nodrq = NULL;
*/
/*
* Function : sun3_scsi_setup(char *str, int *ints)
*
* Purpose : booter command line initialization of the overrides array,
*
* Inputs : str - unused, ints - array of integer parameters with ints[0]
* equal to the number of ints.
*
* TODO: make it actually work!
*
*/
void sun3_scsi_setup(char *str, int *ints) {
printk("sun3_scsi_setup() called\n");
setup_can_queue = -1;
setup_cmd_per_lun = -1;
setup_sg_tablesize = -1;
setup_hostid = -1;
#ifdef SUPPORT_TAGS
setup_use_tagged_queuing = -1;
#endif
printk("sun3_scsi_setup() done\n");
}
/*
* XXX: status debug
*/
static struct Scsi_Host *default_instance;
/*
* Function : int sun3scsi_detect(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 sun3scsi_detect(Scsi_Host_Template * tpnt)
{
unsigned long ioaddr, iopte;
unsigned short *ioptr;
int count = 0;
static int called = 0;
struct Scsi_Host *instance;
if(called)
return 0;
printk("sun3scsi_detect(0x%p)\n",tpnt);
tpnt->proc_name = "Sun3 5380 SCSI"; /* Could you spell "ewww..."? */
/* setup variables */
tpnt->can_queue =
(setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
tpnt->cmd_per_lun =
(setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
tpnt->sg_tablesize =
(setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
if (setup_hostid >= 0)
tpnt->this_id = setup_hostid;
else {
/* use 7 as default */
tpnt->this_id = 7;
}
/* Taken from Sammy's lance driver: */
/* IOBASE_SUN3_SCSI can be found within the IO pmeg with some effort */
for(ioaddr = 0xfe00000; ioaddr < (0xfe00000 + SUN3_PMEG_SIZE);
ioaddr += SUN3_PTE_SIZE) {
iopte = sun3_get_pte(ioaddr);
if(!(iopte & SUN3_PAGE_TYPE_IO)) /* this an io page? */
continue;
if(((iopte & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT) ==
IOBASE_SUN3_SCSI) {
count = 1;
printk("Found ioaddr in pmeg\n");
break;
}
}
if(!count) {
printk("No Sun3 NCR5380 found!\n");
return 0;
}
sun3_scsi_regp = ioaddr;
/* doing some stuff like resetting DVMA: */
ioptr = ioaddr;
*(ioptr+8) = 0;
udelay(10);
*(ioptr+9) = 0;
udelay(10);
*(ioptr+12) = 0;
udelay(10);
*(ioptr+12) = 0x7;
udelay(10);
printk("SCSI status reg = %x\n", *(ioptr+12));
udelay(10);
*(ioptr+13) = 0;
udelay(10);
#ifdef SUPPORT_TAGS
if (setup_use_tagged_queuing < 0)
setup_use_tagged_queuing = DEFAULT_USE_TAGGED_QUEUING;
#endif
instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
default_instance = instance;
/*
if (macintosh_config->ident == MAC_MODEL_IIFX) {
mac_scsi_regp = via1_regp+0x8000;
mac_scsi_drq = via1_regp+0x6000;
mac_scsi_nodrq = via1_regp+0x12000;
} else {
mac_scsi_regp = via1_regp+0x10000;
mac_scsi_drq = via1_regp+0x6000;
mac_scsi_nodrq = via1_regp+0x12000;
}
*/
instance->io_port = (unsigned long) ioaddr;
instance->irq = IRQ_SUN3_SCSI;
NCR5380_init(instance, 0);
instance->n_io_port = 32;
((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
if (instance->irq != IRQ_NONE)
if (sun3_request_irq(instance->irq, sun3scsi_intr,
0, "Sun3SCSI-5380", NULL)) {
printk("scsi%d: IRQ%d not free, interrupts disabled\n",
instance->host_no, instance->irq);
instance->irq = IRQ_NONE;
}
printk("scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
if (instance->irq == IRQ_NONE)
printk ("s disabled");
else
printk (" %d", instance->irq);
printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
instance->can_queue, instance->cmd_per_lun,
SUN3SCSI_PUBLIC_RELEASE);
printk("\nscsi%d:", instance->host_no);
NCR5380_print_options(instance);
printk("\n");
called = 1;
return 1;
}
int sun3scsi_release (struct Scsi_Host *shpnt)
{
if (shpnt->irq != IRQ_NONE)
free_irq (shpnt->irq, NULL);
return 0;
}
#ifdef RESET_BOOT
/*
* Our 'bus reset on boot' function
*/
static void sun3_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( "Sun3 SCSI: resetting the SCSI bus..." );
/* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
sun3_disable_irq( IRQ_SUN3_SCSI );
/* 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; jiffies < end; )
barrier();
/* switch on SCSI IRQ again */
sun3_enable_irq( IRQ_SUN3_SCSI );
printk( " done\n" );
}
#endif
const char * sun3scsi_info (struct Scsi_Host *spnt) {
return "";
}
/*
* NCR 5380 register access functions
*/
static char sun3scsi_read(struct Scsi_Host *instance, int reg)
{
/*
printk("sun3scsi_read(instance=0x%p, reg=0x%x): @0x%p= %d\n",instance,reg,sun3_scsi_regp,sun3_scsi_regp[reg]);
*/
return( sun3_scsi_regp[reg] );
}
static void sun3scsi_write(struct Scsi_Host *instance, int reg, int value)
{
/*
printk("sun3scsi_write(instance=0x%p, reg=0x%x, value=0x%x)\n", instance, reg, value);
*/
sun3_scsi_regp[reg] = value;
}
#include "NCR5380.c"
/*
* Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
* reentering NCR5380_print_status seems to have ugly side effects
*/
void sun3_sun3_debug (void)
{
unsigned long flags;
NCR5380_local_declare();
if (default_instance) {
save_flags(flags);
cli();
NCR5380_print_status(default_instance);
restore_flags(flags);
}
#if 0
polled_scsi_on = 1;
#endif
}
/*
* Helper function for interrupt trouble. More ugly side effects here.
*/
void scsi_sun3_polled (void)
{
unsigned long flags;
NCR5380_local_declare();
struct Scsi_Host *instance;
instance = default_instance;
NCR5380_setup(instance);
if(NCR5380_read(BUS_AND_STATUS_REG)&BASR_IRQ)
{
printk("SCSI poll\n");
save_flags(flags);
cli();
sun3scsi_intr(IRQ_SUN3_SCSI, instance, NULL);
restore_flags(flags);
}
}
#ifdef MODULE
Scsi_Host_Template driver_template = SUN3_NCR5380;
#include "scsi_module.c"
#endif
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