diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/mac_scsi.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/scsi/mac_scsi.c')
-rw-r--r-- | drivers/scsi/mac_scsi.c | 605 |
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" |