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Diffstat (limited to 'drivers/scsi/mac_scsi.c')
-rw-r--r--drivers/scsi/mac_scsi.c547
1 files changed, 547 insertions, 0 deletions
diff --git a/drivers/scsi/mac_scsi.c b/drivers/scsi/mac_scsi.c
new file mode 100644
index 000000000..b5dde9d0d
--- /dev/null
+++ b/drivers/scsi/mac_scsi.c
@@ -0,0 +1,547 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic Macintosh NCR5380 driver
+ *
+ * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
+ *
+ * Copyright 2019 Finn Thain
+ *
+ * derived in part from:
+ */
+/*
+ * Generic Generic NCR5380 driver
+ *
+ * Copyright 1995, Russell King
+ */
+
+#include <linux/delay.h>
+#include <linux/types.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/macintosh.h>
+#include <asm/macints.h>
+#include <asm/setup.h>
+
+#include <scsi/scsi_host.h>
+
+/* Definitions for the core NCR5380 driver. */
+
+#define NCR5380_implementation_fields int pdma_residual
+
+#define NCR5380_read(reg) in_8(hostdata->io + ((reg) << 4))
+#define NCR5380_write(reg, value) out_8(hostdata->io + ((reg) << 4), value)
+
+#define NCR5380_dma_xfer_len macscsi_dma_xfer_len
+#define NCR5380_dma_recv_setup macscsi_pread
+#define NCR5380_dma_send_setup macscsi_pwrite
+#define NCR5380_dma_residual macscsi_dma_residual
+
+#define NCR5380_intr macscsi_intr
+#define NCR5380_queue_command macscsi_queue_command
+#define NCR5380_abort macscsi_abort
+#define NCR5380_host_reset macscsi_host_reset
+#define NCR5380_info macscsi_info
+
+#include "NCR5380.h"
+
+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 = 512;
+module_param(setup_use_pdma, int, 0);
+static int setup_hostid = -1;
+module_param(setup_hostid, int, 0);
+static int setup_toshiba_delay = -1;
+module_param(setup_toshiba_delay, int, 0);
+
+#ifndef MODULE
+static int __init mac_scsi_setup(char *str)
+{
+ int ints[8];
+
+ (void)get_options(str, ARRAY_SIZE(ints), ints);
+
+ if (ints[0] < 1) {
+ pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\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];
+ /* ints[5] (use_tagged_queuing) is ignored */
+ if (ints[0] >= 6)
+ setup_use_pdma = ints[6];
+ if (ints[0] >= 7)
+ setup_toshiba_delay = ints[7];
+ return 1;
+}
+
+__setup("mac5380=", mac_scsi_setup);
+#endif /* !MODULE */
+
+/*
+ * According to "Inside Macintosh: Devices", Mac OS requires disk drivers to
+ * specify the number of bytes between the delays expected from a SCSI target.
+ * This allows the operating system to "prevent bus errors when a target fails
+ * to deliver the next byte within the processor bus error timeout period."
+ * Linux SCSI drivers lack knowledge of the timing behaviour of SCSI targets
+ * so bus errors are unavoidable.
+ *
+ * If a MOVE.B instruction faults, we assume that zero bytes were transferred
+ * and simply retry. That assumption probably depends on target behaviour but
+ * seems to hold up okay. The NOP provides synchronization: without it the
+ * fault can sometimes occur after the program counter has moved past the
+ * offending instruction. Post-increment addressing can't be used.
+ */
+
+#define MOVE_BYTE(operands) \
+ asm volatile ( \
+ "1: moveb " operands " \n" \
+ "11: nop \n" \
+ " addq #1,%0 \n" \
+ " subq #1,%1 \n" \
+ "40: \n" \
+ " \n" \
+ ".section .fixup,\"ax\" \n" \
+ ".even \n" \
+ "90: movel #1, %2 \n" \
+ " jra 40b \n" \
+ ".previous \n" \
+ " \n" \
+ ".section __ex_table,\"a\" \n" \
+ ".align 4 \n" \
+ ".long 1b,90b \n" \
+ ".long 11b,90b \n" \
+ ".previous \n" \
+ : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
+
+/*
+ * If a MOVE.W (or MOVE.L) instruction faults, it cannot be retried because
+ * the residual byte count would be uncertain. In that situation the MOVE_WORD
+ * macro clears n in the fixup section to abort the transfer.
+ */
+
+#define MOVE_WORD(operands) \
+ asm volatile ( \
+ "1: movew " operands " \n" \
+ "11: nop \n" \
+ " subq #2,%1 \n" \
+ "40: \n" \
+ " \n" \
+ ".section .fixup,\"ax\" \n" \
+ ".even \n" \
+ "90: movel #0, %1 \n" \
+ " movel #2, %2 \n" \
+ " jra 40b \n" \
+ ".previous \n" \
+ " \n" \
+ ".section __ex_table,\"a\" \n" \
+ ".align 4 \n" \
+ ".long 1b,90b \n" \
+ ".long 11b,90b \n" \
+ ".previous \n" \
+ : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
+
+#define MOVE_16_WORDS(operands) \
+ asm volatile ( \
+ "1: movew " operands " \n" \
+ "2: movew " operands " \n" \
+ "3: movew " operands " \n" \
+ "4: movew " operands " \n" \
+ "5: movew " operands " \n" \
+ "6: movew " operands " \n" \
+ "7: movew " operands " \n" \
+ "8: movew " operands " \n" \
+ "9: movew " operands " \n" \
+ "10: movew " operands " \n" \
+ "11: movew " operands " \n" \
+ "12: movew " operands " \n" \
+ "13: movew " operands " \n" \
+ "14: movew " operands " \n" \
+ "15: movew " operands " \n" \
+ "16: movew " operands " \n" \
+ "17: nop \n" \
+ " subl #32,%1 \n" \
+ "40: \n" \
+ " \n" \
+ ".section .fixup,\"ax\" \n" \
+ ".even \n" \
+ "90: movel #0, %1 \n" \
+ " movel #2, %2 \n" \
+ " jra 40b \n" \
+ ".previous \n" \
+ " \n" \
+ ".section __ex_table,\"a\" \n" \
+ ".align 4 \n" \
+ ".long 1b,90b \n" \
+ ".long 2b,90b \n" \
+ ".long 3b,90b \n" \
+ ".long 4b,90b \n" \
+ ".long 5b,90b \n" \
+ ".long 6b,90b \n" \
+ ".long 7b,90b \n" \
+ ".long 8b,90b \n" \
+ ".long 9b,90b \n" \
+ ".long 10b,90b \n" \
+ ".long 11b,90b \n" \
+ ".long 12b,90b \n" \
+ ".long 13b,90b \n" \
+ ".long 14b,90b \n" \
+ ".long 15b,90b \n" \
+ ".long 16b,90b \n" \
+ ".long 17b,90b \n" \
+ ".previous \n" \
+ : "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
+
+#define MAC_PDMA_DELAY 32
+
+static inline int mac_pdma_recv(void __iomem *io, unsigned char *start, int n)
+{
+ unsigned char *addr = start;
+ int result = 0;
+
+ if (n >= 1) {
+ MOVE_BYTE("%3@,%0@");
+ if (result)
+ goto out;
+ }
+ if (n >= 1 && ((unsigned long)addr & 1)) {
+ MOVE_BYTE("%3@,%0@");
+ if (result)
+ goto out;
+ }
+ while (n >= 32)
+ MOVE_16_WORDS("%3@,%0@+");
+ while (n >= 2)
+ MOVE_WORD("%3@,%0@+");
+ if (result)
+ return start - addr; /* Negated to indicate uncertain length */
+ if (n == 1)
+ MOVE_BYTE("%3@,%0@");
+out:
+ return addr - start;
+}
+
+static inline int mac_pdma_send(unsigned char *start, void __iomem *io, int n)
+{
+ unsigned char *addr = start;
+ int result = 0;
+
+ if (n >= 1) {
+ MOVE_BYTE("%0@,%3@");
+ if (result)
+ goto out;
+ }
+ if (n >= 1 && ((unsigned long)addr & 1)) {
+ MOVE_BYTE("%0@,%3@");
+ if (result)
+ goto out;
+ }
+ while (n >= 32)
+ MOVE_16_WORDS("%0@+,%3@");
+ while (n >= 2)
+ MOVE_WORD("%0@+,%3@");
+ if (result)
+ return start - addr; /* Negated to indicate uncertain length */
+ if (n == 1)
+ MOVE_BYTE("%0@,%3@");
+out:
+ return addr - start;
+}
+
+/* The "SCSI DMA" chip on the IIfx implements this register. */
+#define CTRL_REG 0x8
+#define CTRL_INTERRUPTS_ENABLE BIT(1)
+#define CTRL_HANDSHAKE_MODE BIT(3)
+
+static inline void write_ctrl_reg(struct NCR5380_hostdata *hostdata, u32 value)
+{
+ out_be32(hostdata->io + (CTRL_REG << 4), value);
+}
+
+static inline int macscsi_pread(struct NCR5380_hostdata *hostdata,
+ unsigned char *dst, int len)
+{
+ u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4);
+ unsigned char *d = dst;
+ int result = 0;
+
+ hostdata->pdma_residual = len;
+
+ while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
+ BASR_DRQ | BASR_PHASE_MATCH,
+ BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) {
+ int bytes;
+
+ if (macintosh_config->ident == MAC_MODEL_IIFX)
+ write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE |
+ CTRL_INTERRUPTS_ENABLE);
+
+ bytes = mac_pdma_recv(s, d, min(hostdata->pdma_residual, 512));
+
+ if (bytes > 0) {
+ d += bytes;
+ hostdata->pdma_residual -= bytes;
+ }
+
+ if (hostdata->pdma_residual == 0)
+ goto out;
+
+ if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
+ BUS_AND_STATUS_REG, BASR_ACK,
+ BASR_ACK, HZ / 64) < 0)
+ scmd_printk(KERN_DEBUG, hostdata->connected,
+ "%s: !REQ and !ACK\n", __func__);
+ if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
+ goto out;
+
+ if (bytes == 0)
+ udelay(MAC_PDMA_DELAY);
+
+ if (bytes >= 0)
+ continue;
+
+ dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
+ "%s: bus error (%d/%d)\n", __func__, d - dst, len);
+ NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
+ result = -1;
+ goto out;
+ }
+
+ scmd_printk(KERN_ERR, hostdata->connected,
+ "%s: phase mismatch or !DRQ\n", __func__);
+ NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
+ result = -1;
+out:
+ if (macintosh_config->ident == MAC_MODEL_IIFX)
+ write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE);
+ return result;
+}
+
+static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
+ unsigned char *src, int len)
+{
+ unsigned char *s = src;
+ u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4);
+ int result = 0;
+
+ hostdata->pdma_residual = len;
+
+ while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
+ BASR_DRQ | BASR_PHASE_MATCH,
+ BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) {
+ int bytes;
+
+ if (macintosh_config->ident == MAC_MODEL_IIFX)
+ write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE |
+ CTRL_INTERRUPTS_ENABLE);
+
+ bytes = mac_pdma_send(s, d, min(hostdata->pdma_residual, 512));
+
+ if (bytes > 0) {
+ s += bytes;
+ hostdata->pdma_residual -= bytes;
+ }
+
+ if (hostdata->pdma_residual == 0) {
+ if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
+ TCR_LAST_BYTE_SENT,
+ TCR_LAST_BYTE_SENT,
+ HZ / 64) < 0) {
+ scmd_printk(KERN_ERR, hostdata->connected,
+ "%s: Last Byte Sent timeout\n", __func__);
+ result = -1;
+ }
+ goto out;
+ }
+
+ if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
+ BUS_AND_STATUS_REG, BASR_ACK,
+ BASR_ACK, HZ / 64) < 0)
+ scmd_printk(KERN_DEBUG, hostdata->connected,
+ "%s: !REQ and !ACK\n", __func__);
+ if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
+ goto out;
+
+ if (bytes == 0)
+ udelay(MAC_PDMA_DELAY);
+
+ if (bytes >= 0)
+ continue;
+
+ dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
+ "%s: bus error (%d/%d)\n", __func__, s - src, len);
+ NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
+ result = -1;
+ goto out;
+ }
+
+ scmd_printk(KERN_ERR, hostdata->connected,
+ "%s: phase mismatch or !DRQ\n", __func__);
+ NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
+ result = -1;
+out:
+ if (macintosh_config->ident == MAC_MODEL_IIFX)
+ write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE);
+ return result;
+}
+
+static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
+ struct scsi_cmnd *cmd)
+{
+ if (hostdata->flags & FLAG_NO_PSEUDO_DMA ||
+ cmd->SCp.this_residual < setup_use_pdma)
+ return 0;
+
+ return cmd->SCp.this_residual;
+}
+
+static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata)
+{
+ return hostdata->pdma_residual;
+}
+
+#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,
+ .name = "Macintosh NCR5380 SCSI",
+ .info = macscsi_info,
+ .queuecommand = macscsi_queue_command,
+ .eh_abort_handler = macscsi_abort,
+ .eh_host_reset_handler = macscsi_host_reset,
+ .can_queue = 16,
+ .this_id = 7,
+ .sg_tablesize = 1,
+ .cmd_per_lun = 2,
+ .dma_boundary = PAGE_SIZE - 1,
+ .cmd_size = NCR5380_CMD_SIZE,
+ .max_sectors = 128,
+};
+
+static int __init mac_scsi_probe(struct platform_device *pdev)
+{
+ struct Scsi_Host *instance;
+ struct NCR5380_hostdata *hostdata;
+ 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;
+
+ pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+
+ 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;
+
+ instance = scsi_host_alloc(&mac_scsi_template,
+ sizeof(struct NCR5380_hostdata));
+ if (!instance)
+ return -ENOMEM;
+
+ if (irq)
+ instance->irq = irq->start;
+ else
+ instance->irq = NO_IRQ;
+
+ hostdata = shost_priv(instance);
+ hostdata->base = pio_mem->start;
+ hostdata->io = (u8 __iomem *)pio_mem->start;
+
+ if (pdma_mem && setup_use_pdma)
+ hostdata->pdma_io = (u8 __iomem *)pdma_mem->start;
+ else
+ host_flags |= FLAG_NO_PSEUDO_DMA;
+
+ host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
+
+ error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP);
+ if (error)
+ goto fail_init;
+
+ if (instance->irq != NO_IRQ) {
+ error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
+ "NCR5380", instance);
+ if (error)
+ goto fail_irq;
+ }
+
+ NCR5380_maybe_reset_bus(instance);
+
+ 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);
+fail_init:
+ 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 08:32:16 +0000