494 строки
13 KiB
C
494 строки
13 KiB
C
/*
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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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* 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/types.h>
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#include <linux/delay.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/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 PSEUDO_DMA
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#define NCR5380_implementation_fields unsigned char *pdma_base
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#define NCR5380_local_declare() struct Scsi_Host *_instance
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#define NCR5380_setup(instance) _instance = instance
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#define NCR5380_read(reg) macscsi_read(_instance, reg)
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#define NCR5380_write(reg, value) macscsi_write(_instance, reg, value)
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#define NCR5380_pread macscsi_pread
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#define NCR5380_pwrite macscsi_pwrite
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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_bus_reset macscsi_bus_reset
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#define NCR5380_info macscsi_info
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#define NCR5380_show_info macscsi_show_info
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#define NCR5380_write_info macscsi_write_info
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#include "NCR5380.h"
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#define RESET_BOOT
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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 = -1;
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module_param(setup_use_pdma, int, 0);
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static int setup_use_tagged_queuing = -1;
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module_param(setup_use_tagged_queuing, 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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/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
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* we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
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* need ten times the standard value... */
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#define TOSHIBA_DELAY
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#ifdef TOSHIBA_DELAY
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#define AFTER_RESET_DELAY (5*HZ/2)
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#else
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#define AFTER_RESET_DELAY (HZ/2)
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#endif
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/*
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* NCR 5380 register access functions
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*/
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static inline char macscsi_read(struct Scsi_Host *instance, int reg)
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{
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return in_8(instance->base + (reg << 4));
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}
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static inline void macscsi_write(struct Scsi_Host *instance, int reg, int value)
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{
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out_8(instance->base + (reg << 4), value);
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}
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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[7];
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(void)get_options(str, ARRAY_SIZE(ints), ints);
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if (ints[0] < 1 || ints[0] > 6) {
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pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>]]]]]\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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if (ints[0] >= 5)
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setup_use_tagged_queuing = ints[5];
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if (ints[0] >= 6)
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setup_use_pdma = ints[6];
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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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#ifdef RESET_BOOT
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/*
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* Our 'bus reset on boot' function
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*/
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static void mac_scsi_reset_boot(struct Scsi_Host *instance)
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{
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unsigned long end;
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NCR5380_local_declare();
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NCR5380_setup(instance);
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/*
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* Do a SCSI reset to clean up the bus during initialization. No messing
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* with the queues, interrupts, or locks necessary here.
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*/
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printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
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/* get in phase */
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NCR5380_write( TARGET_COMMAND_REG,
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PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
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/* assert RST */
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NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
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/* The min. reset hold time is 25us, so 40us should be enough */
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udelay( 50 );
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/* reset RST and interrupt */
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NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
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NCR5380_read( RESET_PARITY_INTERRUPT_REG );
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for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
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barrier();
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printk(KERN_INFO " done\n" );
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}
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#endif
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#ifdef PSEUDO_DMA
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/*
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Pseudo-DMA: (Ove Edlund)
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The code attempts to catch bus errors that occur if one for example
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"trips over the cable".
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XXX: Since bus errors in the PDMA routines never happen on my
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computer, the bus error code is untested.
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If the code works as intended, a bus error results in Pseudo-DMA
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beeing disabled, meaning that the driver switches to slow handshake.
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If bus errors are NOT extremely rare, this has to be changed.
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*/
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#define CP_IO_TO_MEM(s,d,len) \
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__asm__ __volatile__ \
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(" cmp.w #4,%2\n" \
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" bls 8f\n" \
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" move.w %1,%%d0\n" \
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" neg.b %%d0\n" \
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" and.w #3,%%d0\n" \
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" sub.w %%d0,%2\n" \
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" bra 2f\n" \
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" 1: move.b (%0),(%1)+\n" \
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" 2: dbf %%d0,1b\n" \
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" move.w %2,%%d0\n" \
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" lsr.w #5,%%d0\n" \
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" bra 4f\n" \
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" 3: move.l (%0),(%1)+\n" \
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"31: move.l (%0),(%1)+\n" \
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"32: move.l (%0),(%1)+\n" \
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"33: move.l (%0),(%1)+\n" \
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"34: move.l (%0),(%1)+\n" \
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"35: move.l (%0),(%1)+\n" \
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"36: move.l (%0),(%1)+\n" \
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"37: move.l (%0),(%1)+\n" \
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" 4: dbf %%d0,3b\n" \
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" move.w %2,%%d0\n" \
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" lsr.w #2,%%d0\n" \
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" and.w #7,%%d0\n" \
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" bra 6f\n" \
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" 5: move.l (%0),(%1)+\n" \
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" 6: dbf %%d0,5b\n" \
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" and.w #3,%2\n" \
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" bra 8f\n" \
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" 7: move.b (%0),(%1)+\n" \
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" 8: dbf %2,7b\n" \
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" moveq.l #0, %2\n" \
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" 9: \n" \
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".section .fixup,\"ax\"\n" \
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" .even\n" \
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"90: moveq.l #1, %2\n" \
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" jra 9b\n" \
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".previous\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 3b,90b\n" \
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" .long 31b,90b\n" \
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" .long 32b,90b\n" \
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" .long 33b,90b\n" \
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" .long 34b,90b\n" \
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" .long 35b,90b\n" \
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" .long 36b,90b\n" \
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" .long 37b,90b\n" \
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" .long 5b,90b\n" \
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" .long 7b,90b\n" \
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".previous" \
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: "=a"(s), "=a"(d), "=d"(len) \
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: "0"(s), "1"(d), "2"(len) \
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: "d0")
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static int macscsi_pread(struct Scsi_Host *instance,
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unsigned char *dst, int len)
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{
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struct NCR5380_hostdata *hostdata = shost_priv(instance);
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unsigned char *d;
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unsigned char *s;
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NCR5380_local_declare();
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NCR5380_setup(instance);
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s = hostdata->pdma_base + (INPUT_DATA_REG << 4);
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d = dst;
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/* These conditions are derived from MacOS */
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while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
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!(NCR5380_read(STATUS_REG) & SR_REQ))
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;
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if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
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(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
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pr_err("Error in macscsi_pread\n");
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return -1;
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}
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CP_IO_TO_MEM(s, d, len);
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if (len != 0) {
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pr_notice("Bus error in macscsi_pread\n");
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return -1;
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}
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return 0;
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}
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#define CP_MEM_TO_IO(s,d,len) \
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__asm__ __volatile__ \
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(" cmp.w #4,%2\n" \
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" bls 8f\n" \
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" move.w %0,%%d0\n" \
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" neg.b %%d0\n" \
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" and.w #3,%%d0\n" \
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" sub.w %%d0,%2\n" \
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" bra 2f\n" \
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" 1: move.b (%0)+,(%1)\n" \
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" 2: dbf %%d0,1b\n" \
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" move.w %2,%%d0\n" \
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" lsr.w #5,%%d0\n" \
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" bra 4f\n" \
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" 3: move.l (%0)+,(%1)\n" \
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"31: move.l (%0)+,(%1)\n" \
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"32: move.l (%0)+,(%1)\n" \
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"33: move.l (%0)+,(%1)\n" \
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"34: move.l (%0)+,(%1)\n" \
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"35: move.l (%0)+,(%1)\n" \
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"36: move.l (%0)+,(%1)\n" \
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"37: move.l (%0)+,(%1)\n" \
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" 4: dbf %%d0,3b\n" \
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" move.w %2,%%d0\n" \
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" lsr.w #2,%%d0\n" \
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" and.w #7,%%d0\n" \
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" bra 6f\n" \
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" 5: move.l (%0)+,(%1)\n" \
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" 6: dbf %%d0,5b\n" \
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" and.w #3,%2\n" \
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" bra 8f\n" \
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" 7: move.b (%0)+,(%1)\n" \
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" 8: dbf %2,7b\n" \
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" moveq.l #0, %2\n" \
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" 9: \n" \
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".section .fixup,\"ax\"\n" \
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" .even\n" \
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"90: moveq.l #1, %2\n" \
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" jra 9b\n" \
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".previous\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 3b,90b\n" \
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" .long 31b,90b\n" \
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" .long 32b,90b\n" \
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" .long 33b,90b\n" \
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" .long 34b,90b\n" \
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" .long 35b,90b\n" \
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" .long 36b,90b\n" \
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" .long 37b,90b\n" \
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" .long 5b,90b\n" \
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" .long 7b,90b\n" \
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".previous" \
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: "=a"(s), "=a"(d), "=d"(len) \
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: "0"(s), "1"(d), "2"(len) \
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: "d0")
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static int macscsi_pwrite(struct Scsi_Host *instance,
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unsigned char *src, int len)
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{
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struct NCR5380_hostdata *hostdata = shost_priv(instance);
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unsigned char *s;
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unsigned char *d;
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NCR5380_local_declare();
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NCR5380_setup(instance);
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s = src;
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d = hostdata->pdma_base + (OUTPUT_DATA_REG << 4);
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/* These conditions are derived from MacOS */
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while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
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(!(NCR5380_read(STATUS_REG) & SR_REQ) ||
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(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
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;
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if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
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pr_err("Error in macscsi_pwrite\n");
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return -1;
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}
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CP_MEM_TO_IO(s, d, len);
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if (len != 0) {
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pr_notice("Bus error in macscsi_pwrite\n");
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return -1;
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}
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return 0;
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}
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#endif
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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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.show_info = macscsi_show_info,
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.write_info = macscsi_write_info,
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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_bus_reset_handler = macscsi_bus_reset,
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.can_queue = 16,
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.this_id = 7,
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.sg_tablesize = SG_ALL,
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.cmd_per_lun = 2,
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.use_clustering = DISABLE_CLUSTERING
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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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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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#ifdef PSEUDO_DMA
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pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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#endif
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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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if (setup_use_pdma < 0)
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setup_use_pdma = 0;
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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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instance->base = pio_mem->start;
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if (irq)
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instance->irq = irq->start;
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else
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instance->irq = NO_IRQ;
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if (pdma_mem && setup_use_pdma) {
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struct NCR5380_hostdata *hostdata = shost_priv(instance);
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hostdata->pdma_base = (unsigned char *)pdma_mem->start;
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} else
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host_flags |= FLAG_NO_PSEUDO_DMA;
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#ifdef RESET_BOOT
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mac_scsi_reset_boot(instance);
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#endif
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#ifdef SUPPORT_TAGS
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host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
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#endif
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NCR5380_init(instance, host_flags);
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if (instance->irq != NO_IRQ) {
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error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
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"NCR5380", instance);
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if (error)
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goto fail_irq;
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}
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error = scsi_add_host(instance, NULL);
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if (error)
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goto fail_host;
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platform_set_drvdata(pdev, instance);
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scsi_scan_host(instance);
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return 0;
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fail_host:
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if (instance->irq != NO_IRQ)
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free_irq(instance->irq, instance);
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fail_irq:
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NCR5380_exit(instance);
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scsi_host_put(instance);
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return error;
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}
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static int __exit mac_scsi_remove(struct platform_device *pdev)
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{
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struct Scsi_Host *instance = platform_get_drvdata(pdev);
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scsi_remove_host(instance);
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if (instance->irq != NO_IRQ)
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free_irq(instance->irq, instance);
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NCR5380_exit(instance);
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scsi_host_put(instance);
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return 0;
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}
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static struct platform_driver mac_scsi_driver = {
|
|
.remove = __exit_p(mac_scsi_remove),
|
|
.driver = {
|
|
.name = DRV_MODULE_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);
|
|
|
|
MODULE_ALIAS("platform:" DRV_MODULE_NAME);
|
|
MODULE_LICENSE("GPL");
|