| // 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 during a receive operation, we assume the |
| * target sent nothing and try again. That assumption probably depends on |
| * target firmware but it seems to hold up okay. If a fault happens during a |
| * send operation, the target may or may not have seen /ACK and got the byte. |
| * It's uncertain so the whole SCSI command gets retried. |
| * |
| * The NOP is needed for synchronization because the fault address in the |
| * exception stack frame may or may not be the instruction that actually |
| * caused the bus error. 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)) |
| |
| 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) |
| return -1; |
| } |
| if (n >= 1 && ((unsigned long)addr & 1)) { |
| MOVE_BYTE("%0@,%3@"); |
| if (result) |
| return -2; |
| } |
| while (n >= 32) |
| MOVE_16_WORDS("%0@+,%3@"); |
| while (n >= 2) |
| MOVE_WORD("%0@+,%3@"); |
| if (result) |
| return start - addr - 1; /* Negated to indicate uncertain length */ |
| if (n == 1) |
| MOVE_BYTE("%0@,%3@"); |
| 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_wait_for_drq(struct NCR5380_hostdata *hostdata) |
| { |
| unsigned int n = 1; /* effectively multiplies NCR5380_REG_POLL_TIME */ |
| unsigned char basr; |
| |
| again: |
| basr = NCR5380_read(BUS_AND_STATUS_REG); |
| |
| if (!(basr & BASR_PHASE_MATCH)) |
| return 1; |
| |
| if (basr & BASR_IRQ) |
| return -1; |
| |
| if (basr & BASR_DRQ) |
| return 0; |
| |
| if (n-- == 0) { |
| NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); |
| dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host, |
| "%s: DRQ timeout\n", __func__); |
| return -1; |
| } |
| |
| NCR5380_poll_politely2(hostdata, |
| BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ, |
| BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, 0); |
| goto again; |
| } |
| |
| 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; |
| |
| hostdata->pdma_residual = len; |
| |
| while (macscsi_wait_for_drq(hostdata) == 0) { |
| int bytes, chunk_bytes; |
| |
| if (macintosh_config->ident == MAC_MODEL_IIFX) |
| write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE | |
| CTRL_INTERRUPTS_ENABLE); |
| |
| chunk_bytes = min(hostdata->pdma_residual, 512); |
| bytes = mac_pdma_recv(s, d, chunk_bytes); |
| |
| if (macintosh_config->ident == MAC_MODEL_IIFX) |
| write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE); |
| |
| if (bytes > 0) { |
| d += bytes; |
| hostdata->pdma_residual -= bytes; |
| } |
| |
| if (hostdata->pdma_residual == 0) |
| break; |
| |
| if (bytes > 0) |
| continue; |
| |
| NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); |
| dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host, |
| "%s: bus error [%d/%d] (%d/%d)\n", |
| __func__, d - dst, len, bytes, chunk_bytes); |
| |
| if (bytes == 0) |
| continue; |
| |
| if (macscsi_wait_for_drq(hostdata) <= 0) |
| set_host_byte(hostdata->connected, DID_ERROR); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| 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); |
| |
| hostdata->pdma_residual = len; |
| |
| while (macscsi_wait_for_drq(hostdata) == 0) { |
| int bytes, chunk_bytes; |
| |
| if (macintosh_config->ident == MAC_MODEL_IIFX) |
| write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE | |
| CTRL_INTERRUPTS_ENABLE); |
| |
| chunk_bytes = min(hostdata->pdma_residual, 512); |
| bytes = mac_pdma_send(s, d, chunk_bytes); |
| |
| if (macintosh_config->ident == MAC_MODEL_IIFX) |
| write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE); |
| |
| if (bytes > 0) { |
| s += bytes; |
| hostdata->pdma_residual -= bytes; |
| } |
| |
| if (hostdata->pdma_residual == 0) |
| break; |
| |
| if (bytes > 0) |
| continue; |
| |
| NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); |
| dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host, |
| "%s: bus error [%d/%d] (%d/%d)\n", |
| __func__, s - src, len, bytes, chunk_bytes); |
| |
| if (bytes == 0) |
| continue; |
| |
| if (macscsi_wait_for_drq(hostdata) <= 0) |
| set_host_byte(hostdata->connected, DID_ERROR); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata, |
| struct scsi_cmnd *cmd) |
| { |
| int resid = NCR5380_to_ncmd(cmd)->this_residual; |
| |
| if (hostdata->flags & FLAG_NO_PSEUDO_DMA || resid < setup_use_pdma) |
| return 0; |
| |
| return resid; |
| } |
| |
| 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 = sizeof(struct NCR5380_cmd), |
| .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"); |
