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Diffstat (limited to 'drivers/scsi/mac_scsi.c')
-rw-r--r--drivers/scsi/mac_scsi.c605
1 files changed, 605 insertions, 0 deletions
diff --git a/drivers/scsi/mac_scsi.c b/drivers/scsi/mac_scsi.c
new file mode 100644
index 000000000000..d5fd17ef74db
--- /dev/null
+++ b/drivers/scsi/mac_scsi.c
@@ -0,0 +1,605 @@
+/*
+ * 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
+ */
+
+/*
+ * $Log: mac_NCR5380.c,v $
+ */
+
+#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/blkdev.h>
+#include <linux/interrupt.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+
+#include <asm/macintosh.h>
+#include <asm/macints.h>
+#include <asm/machw.h>
+#include <asm/mac_via.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "mac_scsi.h"
+#include "NCR5380.h"
+
+#if 0
+#define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
+#else
+#define NDEBUG (NDEBUG_ABORT)
+#endif
+
+#define RESET_BOOT
+#define DRIVER_SETUP
+
+#define ENABLE_IRQ() mac_enable_irq( IRQ_MAC_SCSI );
+#define DISABLE_IRQ() mac_disable_irq( IRQ_MAC_SCSI );
+
+extern void via_scsi_clear(void);
+
+#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
+ */
+
+#if 0
+/* Debug versions */
+#define CTRL(p,v) (*ctrl = (v))
+
+static char macscsi_read(struct Scsi_Host *instance, int reg)
+{
+ int iobase = instance->io_port;
+ int i;
+ int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
+
+ CTRL(iobase, 0);
+ i = in_8(iobase + (reg<<4));
+ CTRL(iobase, 0x40);
+
+ return i;
+}
+
+static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
+{
+ int iobase = instance->io_port;
+ int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
+
+ CTRL(iobase, 0);
+ out_8(iobase + (reg<<4), value);
+ CTRL(iobase, 0x40);
+}
+#else
+
+/* Fast versions */
+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);
+}
+#endif
+
+
+/*
+ * 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) {
+#ifdef DRIVER_SETUP
+ 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 */
+
+#endif /* DRIVER_SETUP */
+ return 1;
+}
+
+__setup("mac5380=", mac_scsi_setup);
+
+/*
+ * If you want to find the instance with (k)gdb ...
+ */
+#if NDEBUG
+static struct Scsi_Host *default_instance;
+#endif
+
+/*
+ * Function : int macscsi_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 macscsi_detect(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 );
+
+ /* 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;
+ }
+
+#ifdef SUPPORT_TAGS
+ if (setup_use_tagged_queuing < 0)
+ setup_use_tagged_queuing = USE_TAGGED_QUEUING;
+#endif
+
+ /* Once we support multiple 5380s (e.g. DuoDock) we'll do
+ something different here */
+ instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
+#if NDEBUG
+ default_instance = instance;
+#endif
+
+ 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;
+
+ ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
+
+ if (instance->irq != SCSI_IRQ_NONE)
+ if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW,
+ "ncr5380", instance)) {
+ printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
+ instance->host_no, instance->irq);
+ instance->irq = SCSI_IRQ_NONE;
+ }
+
+ printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
+ if (instance->irq == SCSI_IRQ_NONE)
+ printk (KERN_INFO "s disabled");
+ else
+ printk (KERN_INFO " %d", instance->irq);
+ printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
+ instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
+ printk(KERN_INFO "\nscsi%d:", instance->host_no);
+ NCR5380_print_options(instance);
+ printk("\n");
+ called = 1;
+ return 1;
+}
+
+int macscsi_release (struct Scsi_Host *shpnt)
+{
+ if (shpnt->irq != SCSI_IRQ_NONE)
+ free_irq (shpnt->irq, NCR5380_intr);
+ 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..." );
+
+ /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
+ mac_disable_irq(IRQ_MAC_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; time_before(jiffies, end); )
+ barrier();
+
+ /* switch on SCSI IRQ again */
+ mac_enable_irq(IRQ_MAC_SCSI);
+
+ printk(KERN_INFO " done\n" );
+}
+#endif
+
+const char * macscsi_info (struct Scsi_Host *spnt) {
+ return "";
+}
+
+/*
+ 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;
+}
+
+
+/* These control the behaviour of the generic 5380 core */
+#define AUTOSENSE
+#define PSEUDO_DMA
+
+#include "NCR5380.c"
+
+static Scsi_Host_Template driver_template = {
+ .proc_name = "Mac5380",
+ .proc_info = macscsi_proc_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,
+ .eh_device_reset_handler = macscsi_device_reset,
+ .eh_host_reset_handler = macscsi_host_reset,
+ .can_queue = CAN_QUEUE,
+ .this_id = 7,
+ .sg_tablesize = SG_ALL,
+ .cmd_per_lun = CMD_PER_LUN,
+ .unchecked_isa_dma = 0,
+ .use_clustering = DISABLE_CLUSTERING
+};
+
+
+#include "scsi_module.c"
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