| /* |
| * Generic Macintosh NCR5380 driver |
| * |
| * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov> |
| * |
| * derived in part from: |
| */ |
| /* |
| * Generic Generic NCR5380 driver |
| * |
| * Copyright 1995, Russell King |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/delay.h> |
| #include <linux/module.h> |
| #include <linux/ioport.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| |
| #include <asm/hwtest.h> |
| #include <asm/io.h> |
| #include <asm/macints.h> |
| #include <asm/setup.h> |
| |
| #include <scsi/scsi_host.h> |
| |
| /* Definitions for the core NCR5380 driver. */ |
| |
| #define PSEUDO_DMA |
| |
| #define NCR5380_implementation_fields unsigned char *pdma_base |
| #define NCR5380_local_declare() struct Scsi_Host *_instance |
| #define NCR5380_setup(instance) _instance = instance |
| |
| #define NCR5380_read(reg) macscsi_read(_instance, reg) |
| #define NCR5380_write(reg, value) macscsi_write(_instance, reg, value) |
| |
| #define NCR5380_pread macscsi_pread |
| #define NCR5380_pwrite macscsi_pwrite |
| |
| #define NCR5380_intr macscsi_intr |
| #define NCR5380_queue_command macscsi_queue_command |
| #define NCR5380_abort macscsi_abort |
| #define NCR5380_bus_reset macscsi_bus_reset |
| #define NCR5380_info macscsi_info |
| #define NCR5380_show_info macscsi_show_info |
| #define NCR5380_write_info macscsi_write_info |
| |
| #include "NCR5380.h" |
| |
| #define RESET_BOOT |
| |
| static int setup_can_queue = -1; |
| module_param(setup_can_queue, int, 0); |
| static int setup_cmd_per_lun = -1; |
| module_param(setup_cmd_per_lun, int, 0); |
| static int setup_sg_tablesize = -1; |
| module_param(setup_sg_tablesize, int, 0); |
| static int setup_use_pdma = -1; |
| module_param(setup_use_pdma, int, 0); |
| static int setup_use_tagged_queuing = -1; |
| module_param(setup_use_tagged_queuing, int, 0); |
| static int setup_hostid = -1; |
| module_param(setup_hostid, int, 0); |
| |
| /* 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 |
| |
| /* |
| * NCR 5380 register access functions |
| */ |
| |
| static inline char macscsi_read(struct Scsi_Host *instance, int reg) |
| { |
| return in_8(instance->base + (reg << 4)); |
| } |
| |
| static inline void macscsi_write(struct Scsi_Host *instance, int reg, int value) |
| { |
| out_8(instance->base + (reg << 4), value); |
| } |
| |
| #ifndef MODULE |
| static int __init mac_scsi_setup(char *str) |
| { |
| int ints[7]; |
| |
| (void)get_options(str, ARRAY_SIZE(ints), ints); |
| |
| if (ints[0] < 1 || ints[0] > 6) { |
| pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>]]]]]\n"); |
| return 0; |
| } |
| if (ints[0] >= 1) |
| setup_can_queue = ints[1]; |
| if (ints[0] >= 2) |
| setup_cmd_per_lun = ints[2]; |
| if (ints[0] >= 3) |
| setup_sg_tablesize = ints[3]; |
| if (ints[0] >= 4) |
| setup_hostid = ints[4]; |
| if (ints[0] >= 5) |
| setup_use_tagged_queuing = ints[5]; |
| if (ints[0] >= 6) |
| setup_use_pdma = ints[6]; |
| return 1; |
| } |
| |
| __setup("mac5380=", mac_scsi_setup); |
| #endif /* !MODULE */ |
| |
| #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..." ); |
| |
| /* 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(); |
| |
| printk(KERN_INFO " done\n" ); |
| } |
| #endif |
| |
| #ifdef PSEUDO_DMA |
| /* |
| 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 |
| being 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) |
| { |
| struct NCR5380_hostdata *hostdata = shost_priv(instance); |
| unsigned char *d; |
| unsigned char *s; |
| |
| NCR5380_local_declare(); |
| NCR5380_setup(instance); |
| |
| s = hostdata->pdma_base + (INPUT_DATA_REG << 4); |
| 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)) { |
| pr_err("Error in macscsi_pread\n"); |
| return -1; |
| } |
| |
| CP_IO_TO_MEM(s, d, len); |
| |
| if (len != 0) { |
| pr_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) |
| { |
| struct NCR5380_hostdata *hostdata = shost_priv(instance); |
| unsigned char *s; |
| unsigned char *d; |
| |
| NCR5380_local_declare(); |
| NCR5380_setup(instance); |
| |
| s = src; |
| d = hostdata->pdma_base + (OUTPUT_DATA_REG << 4); |
| |
| /* 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)) { |
| pr_err("Error in macscsi_pwrite\n"); |
| return -1; |
| } |
| |
| CP_MEM_TO_IO(s, d, len); |
| |
| if (len != 0) { |
| pr_notice("Bus error in macscsi_pwrite\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| #include "NCR5380.c" |
| |
| #define DRV_MODULE_NAME "mac_scsi" |
| #define PFX DRV_MODULE_NAME ": " |
| |
| static struct scsi_host_template mac_scsi_template = { |
| .module = THIS_MODULE, |
| .proc_name = DRV_MODULE_NAME, |
| .show_info = macscsi_show_info, |
| .write_info = macscsi_write_info, |
| .name = "Macintosh NCR5380 SCSI", |
| .info = macscsi_info, |
| .queuecommand = macscsi_queue_command, |
| .eh_abort_handler = macscsi_abort, |
| .eh_bus_reset_handler = macscsi_bus_reset, |
| .can_queue = 16, |
| .this_id = 7, |
| .sg_tablesize = SG_ALL, |
| .cmd_per_lun = 2, |
| .use_clustering = DISABLE_CLUSTERING |
| }; |
| |
| static int __init mac_scsi_probe(struct platform_device *pdev) |
| { |
| struct Scsi_Host *instance; |
| int error; |
| int host_flags = 0; |
| struct resource *irq, *pio_mem, *pdma_mem = NULL; |
| |
| pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!pio_mem) |
| return -ENODEV; |
| |
| #ifdef PSEUDO_DMA |
| pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| #endif |
| |
| irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| |
| if (!hwreg_present((unsigned char *)pio_mem->start + |
| (STATUS_REG << 4))) { |
| pr_info(PFX "no device detected at %pap\n", &pio_mem->start); |
| return -ENODEV; |
| } |
| |
| if (setup_can_queue > 0) |
| mac_scsi_template.can_queue = setup_can_queue; |
| if (setup_cmd_per_lun > 0) |
| mac_scsi_template.cmd_per_lun = setup_cmd_per_lun; |
| if (setup_sg_tablesize >= 0) |
| mac_scsi_template.sg_tablesize = setup_sg_tablesize; |
| if (setup_hostid >= 0) |
| mac_scsi_template.this_id = setup_hostid & 7; |
| if (setup_use_pdma < 0) |
| setup_use_pdma = 0; |
| |
| instance = scsi_host_alloc(&mac_scsi_template, |
| sizeof(struct NCR5380_hostdata)); |
| if (!instance) |
| return -ENOMEM; |
| |
| instance->base = pio_mem->start; |
| if (irq) |
| instance->irq = irq->start; |
| else |
| instance->irq = NO_IRQ; |
| |
| if (pdma_mem && setup_use_pdma) { |
| struct NCR5380_hostdata *hostdata = shost_priv(instance); |
| |
| hostdata->pdma_base = (unsigned char *)pdma_mem->start; |
| } else |
| host_flags |= FLAG_NO_PSEUDO_DMA; |
| |
| #ifdef RESET_BOOT |
| mac_scsi_reset_boot(instance); |
| #endif |
| |
| #ifdef SUPPORT_TAGS |
| host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0; |
| #endif |
| |
| NCR5380_init(instance, host_flags); |
| |
| if (instance->irq != NO_IRQ) { |
| error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED, |
| "NCR5380", instance); |
| if (error) |
| goto fail_irq; |
| } |
| |
| error = scsi_add_host(instance, NULL); |
| if (error) |
| goto fail_host; |
| |
| platform_set_drvdata(pdev, instance); |
| |
| scsi_scan_host(instance); |
| return 0; |
| |
| fail_host: |
| if (instance->irq != NO_IRQ) |
| free_irq(instance->irq, instance); |
| fail_irq: |
| NCR5380_exit(instance); |
| scsi_host_put(instance); |
| return error; |
| } |
| |
| static int __exit mac_scsi_remove(struct platform_device *pdev) |
| { |
| struct Scsi_Host *instance = platform_get_drvdata(pdev); |
| |
| scsi_remove_host(instance); |
| if (instance->irq != NO_IRQ) |
| free_irq(instance->irq, instance); |
| NCR5380_exit(instance); |
| scsi_host_put(instance); |
| return 0; |
| } |
| |
| static struct platform_driver mac_scsi_driver = { |
| .remove = __exit_p(mac_scsi_remove), |
| .driver = { |
| .name = DRV_MODULE_NAME, |
| }, |
| }; |
| |
| module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe); |
| |
| MODULE_ALIAS("platform:" DRV_MODULE_NAME); |
| MODULE_LICENSE("GPL"); |
