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drivers/scsi/mac_scsi.c
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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 * * 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> |
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#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> |
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#include <asm/mac_via.h> #include "scsi.h" #include <scsi/scsi_host.h> #include "mac_scsi.h" |
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/* These control the behaviour of the generic 5380 core */ #define AUTOSENSE #define PSEUDO_DMA |
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#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 |
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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>] "); printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters? "); 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 ! ", 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 /* |
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* Function : int macscsi_detect(struct scsi_host_template * tpnt) |
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* * 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. * */ |
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int macscsi_detect(struct scsi_host_template * tpnt) |
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{ 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, |
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"ncr5380", instance)) { |
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printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled ", 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 " scsi%d:", instance->host_no); NCR5380_print_options(instance); printk(" "); called = 1; return 1; } int macscsi_release (struct Scsi_Host *shpnt) { if (shpnt->irq != SCSI_IRQ_NONE) |
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free_irq(shpnt->irq, shpnt); |
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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 */ |
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disable_irq(IRQ_MAC_SCSI); |
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/* 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 */ |
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enable_irq(IRQ_MAC_SCSI); |
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printk(KERN_INFO " done " ); } #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 " \ " bls 8f " \ " move.w %1,%%d0 " \ " neg.b %%d0 " \ " and.w #3,%%d0 " \ " sub.w %%d0,%2 " \ " bra 2f " \ " 1: move.b (%0),(%1)+ " \ " 2: dbf %%d0,1b " \ " move.w %2,%%d0 " \ " lsr.w #5,%%d0 " \ " bra 4f " \ " 3: move.l (%0),(%1)+ " \ "31: move.l (%0),(%1)+ " \ "32: move.l (%0),(%1)+ " \ "33: move.l (%0),(%1)+ " \ "34: move.l (%0),(%1)+ " \ "35: move.l (%0),(%1)+ " \ "36: move.l (%0),(%1)+ " \ "37: move.l (%0),(%1)+ " \ " 4: dbf %%d0,3b " \ " move.w %2,%%d0 " \ " lsr.w #2,%%d0 " \ " and.w #7,%%d0 " \ " bra 6f " \ " 5: move.l (%0),(%1)+ " \ " 6: dbf %%d0,5b " \ " and.w #3,%2 " \ " bra 8f " \ " 7: move.b (%0),(%1)+ " \ " 8: dbf %2,7b " \ " moveq.l #0, %2 " \ " 9: " \ ".section .fixup,\"ax\" " \ " .even " \ "90: moveq.l #1, %2 " \ " jra 9b " \ ".previous " \ ".section __ex_table,\"a\" " \ " .align 4 " \ " .long 1b,90b " \ " .long 3b,90b " \ " .long 31b,90b " \ " .long 32b,90b " \ " .long 33b,90b " \ " .long 34b,90b " \ " .long 35b,90b " \ " .long 36b,90b " \ " .long 37b,90b " \ " .long 5b,90b " \ " .long 7b,90b " \ ".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 "); return -1; } CP_IO_TO_MEM(s, d, len); if (len != 0) { printk(KERN_NOTICE "Bus error in macscsi_pread "); return -1; } return 0; } #define CP_MEM_TO_IO(s,d,len) \ __asm__ __volatile__ \ (" cmp.w #4,%2 " \ " bls 8f " \ " move.w %0,%%d0 " \ " neg.b %%d0 " \ " and.w #3,%%d0 " \ " sub.w %%d0,%2 " \ " bra 2f " \ " 1: move.b (%0)+,(%1) " \ " 2: dbf %%d0,1b " \ " move.w %2,%%d0 " \ " lsr.w #5,%%d0 " \ " bra 4f " \ " 3: move.l (%0)+,(%1) " \ "31: move.l (%0)+,(%1) " \ "32: move.l (%0)+,(%1) " \ "33: move.l (%0)+,(%1) " \ "34: move.l (%0)+,(%1) " \ "35: move.l (%0)+,(%1) " \ "36: move.l (%0)+,(%1) " \ "37: move.l (%0)+,(%1) " \ " 4: dbf %%d0,3b " \ " move.w %2,%%d0 " \ " lsr.w #2,%%d0 " \ " and.w #7,%%d0 " \ " bra 6f " \ " 5: move.l (%0)+,(%1) " \ " 6: dbf %%d0,5b " \ " and.w #3,%2 " \ " bra 8f " \ " 7: move.b (%0)+,(%1) " \ " 8: dbf %2,7b " \ " moveq.l #0, %2 " \ " 9: " \ ".section .fixup,\"ax\" " \ " .even " \ "90: moveq.l #1, %2 " \ " jra 9b " \ ".previous " \ ".section __ex_table,\"a\" " \ " .align 4 " \ " .long 1b,90b " \ " .long 3b,90b " \ " .long 31b,90b " \ " .long 32b,90b " \ " .long 33b,90b " \ " .long 34b,90b " \ " .long 35b,90b " \ " .long 36b,90b " \ " .long 37b,90b " \ " .long 5b,90b " \ " .long 7b,90b " \ ".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 "); return -1; } CP_MEM_TO_IO(s, d, len); if (len != 0) { printk(KERN_NOTICE "Bus error in macscsi_pwrite "); return -1; } return 0; } |
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#include "NCR5380.c" |
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static struct scsi_host_template driver_template = { |
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.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, |
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.can_queue = CAN_QUEUE, .this_id = 7, .sg_tablesize = SG_ALL, .cmd_per_lun = CMD_PER_LUN, |
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.use_clustering = DISABLE_CLUSTERING }; #include "scsi_module.c" |