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