--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff