Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Finn Thain | 1556 | 78.31% | 26 | 70.27% |
Linus Torvalds (pre-git) | 257 | 12.93% | 4 | 10.81% |
Geert Uytterhoeven | 161 | 8.10% | 1 | 2.70% |
Christoph Hellwig | 6 | 0.30% | 2 | 5.41% |
Hannes Reinecke | 4 | 0.20% | 1 | 2.70% |
Thomas Gleixner | 1 | 0.05% | 1 | 2.70% |
Arjan van de Ven | 1 | 0.05% | 1 | 2.70% |
Adrian Bunk | 1 | 0.05% | 1 | 2.70% |
Total | 1987 | 37 |
// 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");
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