603 lines
15 KiB
C
603 lines
15 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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* ALPHA RELEASE 1.
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*
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* For more information, please consult
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*
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* NCR 5380 Family
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* SCSI Protocol Controller
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* Databook
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*
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* NCR Microelectronics
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* 1635 Aeroplaza Drive
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* Colorado Springs, CO 80916
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* 1+ (719) 578-3400
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* 1+ (800) 334-5454
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*/
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/*
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* $Log: mac_NCR5380.c,v $
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*/
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/signal.h>
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#include <linux/sched.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 <asm/io.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/macintosh.h>
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#include <asm/macints.h>
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#include <asm/machw.h>
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#include <asm/mac_via.h>
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#include "scsi.h"
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#include <scsi/scsi_host.h>
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#include "mac_scsi.h"
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#include "NCR5380.h"
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#if 0
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#define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
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#else
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#define NDEBUG (NDEBUG_ABORT)
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#endif
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#define RESET_BOOT
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#define DRIVER_SETUP
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#define ENABLE_IRQ() mac_enable_irq( IRQ_MAC_SCSI );
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#define DISABLE_IRQ() mac_disable_irq( IRQ_MAC_SCSI );
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extern void via_scsi_clear(void);
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#ifdef RESET_BOOT
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static void mac_scsi_reset_boot(struct Scsi_Host *instance);
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#endif
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static int setup_called = 0;
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static int setup_can_queue = -1;
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static int setup_cmd_per_lun = -1;
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static int setup_sg_tablesize = -1;
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static int setup_use_pdma = -1;
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#ifdef SUPPORT_TAGS
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static int setup_use_tagged_queuing = -1;
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#endif
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static int setup_hostid = -1;
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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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static volatile unsigned char *mac_scsi_regp = NULL;
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static volatile unsigned char *mac_scsi_drq = NULL;
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static volatile unsigned char *mac_scsi_nodrq = NULL;
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/*
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* NCR 5380 register access functions
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*/
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#if 0
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/* Debug versions */
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#define CTRL(p,v) (*ctrl = (v))
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static char macscsi_read(struct Scsi_Host *instance, int reg)
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{
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int iobase = instance->io_port;
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int i;
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int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
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CTRL(iobase, 0);
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i = in_8(iobase + (reg<<4));
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CTRL(iobase, 0x40);
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return i;
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}
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static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
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{
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int iobase = instance->io_port;
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int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
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CTRL(iobase, 0);
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out_8(iobase + (reg<<4), value);
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CTRL(iobase, 0x40);
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}
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#else
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/* Fast versions */
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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->io_port + (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->io_port + (reg<<4), value);
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}
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#endif
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/*
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* Function : mac_scsi_setup(char *str)
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*
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* Purpose : booter command line initialization of the overrides array,
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*
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* Inputs : str - comma delimited list of options
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*
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*/
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static int __init mac_scsi_setup(char *str) {
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#ifdef DRIVER_SETUP
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int ints[7];
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(void)get_options( str, ARRAY_SIZE(ints), ints);
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if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
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printk(KERN_WARNING "scsi: <mac5380>"
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" Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
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printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
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return 0;
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}
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if (ints[0] >= 1) {
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if (ints[1] > 0)
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/* no limits on this, just > 0 */
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setup_can_queue = ints[1];
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}
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if (ints[0] >= 2) {
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if (ints[2] > 0)
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setup_cmd_per_lun = ints[2];
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}
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if (ints[0] >= 3) {
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if (ints[3] >= 0) {
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setup_sg_tablesize = ints[3];
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/* Must be <= SG_ALL (255) */
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if (setup_sg_tablesize > SG_ALL)
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setup_sg_tablesize = SG_ALL;
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}
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}
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if (ints[0] >= 4) {
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/* Must be between 0 and 7 */
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if (ints[4] >= 0 && ints[4] <= 7)
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setup_hostid = ints[4];
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else if (ints[4] > 7)
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printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
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}
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#ifdef SUPPORT_TAGS
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if (ints[0] >= 5) {
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if (ints[5] >= 0)
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setup_use_tagged_queuing = !!ints[5];
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}
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if (ints[0] == 6) {
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if (ints[6] >= 0)
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setup_use_pdma = ints[6];
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}
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#else
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if (ints[0] == 5) {
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if (ints[5] >= 0)
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setup_use_pdma = ints[5];
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}
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#endif /* SUPPORT_TAGS */
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#endif /* DRIVER_SETUP */
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return 1;
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}
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__setup("mac5380=", mac_scsi_setup);
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/*
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* If you want to find the instance with (k)gdb ...
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*/
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#if NDEBUG
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static struct Scsi_Host *default_instance;
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#endif
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/*
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* Function : int macscsi_detect(struct scsi_host_template * tpnt)
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*
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* Purpose : initializes mac NCR5380 driver based on the
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* command line / compile time port and irq definitions.
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*
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* Inputs : tpnt - template for this SCSI adapter.
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*
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* Returns : 1 if a host adapter was found, 0 if not.
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*
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*/
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int macscsi_detect(struct scsi_host_template * tpnt)
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{
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static int called = 0;
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int flags = 0;
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struct Scsi_Host *instance;
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if (!MACH_IS_MAC || called)
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return( 0 );
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if (macintosh_config->scsi_type != MAC_SCSI_OLD)
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return( 0 );
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/* setup variables */
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tpnt->can_queue =
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(setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
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tpnt->cmd_per_lun =
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(setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
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tpnt->sg_tablesize =
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(setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
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if (setup_hostid >= 0)
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tpnt->this_id = setup_hostid;
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else {
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/* use 7 as default */
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tpnt->this_id = 7;
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}
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#ifdef SUPPORT_TAGS
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if (setup_use_tagged_queuing < 0)
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setup_use_tagged_queuing = USE_TAGGED_QUEUING;
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#endif
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/* Once we support multiple 5380s (e.g. DuoDock) we'll do
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something different here */
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instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
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#if NDEBUG
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default_instance = instance;
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#endif
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if (macintosh_config->ident == MAC_MODEL_IIFX) {
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mac_scsi_regp = via1+0x8000;
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mac_scsi_drq = via1+0xE000;
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mac_scsi_nodrq = via1+0xC000;
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/* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
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flags = FLAG_NO_PSEUDO_DMA;
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} else {
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mac_scsi_regp = via1+0x10000;
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mac_scsi_drq = via1+0x6000;
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mac_scsi_nodrq = via1+0x12000;
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}
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if (! setup_use_pdma)
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flags = FLAG_NO_PSEUDO_DMA;
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instance->io_port = (unsigned long) mac_scsi_regp;
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instance->irq = IRQ_MAC_SCSI;
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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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NCR5380_init(instance, flags);
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instance->n_io_port = 255;
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((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
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if (instance->irq != SCSI_IRQ_NONE)
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if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW,
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"ncr5380", instance)) {
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printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
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instance->host_no, instance->irq);
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instance->irq = SCSI_IRQ_NONE;
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}
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printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
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if (instance->irq == SCSI_IRQ_NONE)
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printk (KERN_INFO "s disabled");
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else
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printk (KERN_INFO " %d", instance->irq);
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printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
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instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
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printk(KERN_INFO "\nscsi%d:", instance->host_no);
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NCR5380_print_options(instance);
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printk("\n");
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called = 1;
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return 1;
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}
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int macscsi_release (struct Scsi_Host *shpnt)
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{
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if (shpnt->irq != SCSI_IRQ_NONE)
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free_irq (shpnt->irq, NCR5380_intr);
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NCR5380_exit(shpnt);
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return 0;
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}
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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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/* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
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mac_disable_irq(IRQ_MAC_SCSI);
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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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/* switch on SCSI IRQ again */
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mac_enable_irq(IRQ_MAC_SCSI);
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printk(KERN_INFO " done\n" );
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}
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#endif
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const char * macscsi_info (struct Scsi_Host *spnt) {
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return "";
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}
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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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unsigned char *d;
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volatile unsigned char *s;
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NCR5380_local_declare();
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NCR5380_setup(instance);
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s = mac_scsi_drq+0x60;
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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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printk(KERN_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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printk(KERN_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" \
|
|
"33: move.l (%0)+,(%1)\n" \
|
|
"34: move.l (%0)+,(%1)\n" \
|
|
"35: move.l (%0)+,(%1)\n" \
|
|
"36: move.l (%0)+,(%1)\n" \
|
|
"37: move.l (%0)+,(%1)\n" \
|
|
" 4: dbf %%d0,3b\n" \
|
|
" move.w %2,%%d0\n" \
|
|
" lsr.w #2,%%d0\n" \
|
|
" and.w #7,%%d0\n" \
|
|
" bra 6f\n" \
|
|
" 5: move.l (%0)+,(%1)\n" \
|
|
" 6: dbf %%d0,5b\n" \
|
|
" and.w #3,%2\n" \
|
|
" bra 8f\n" \
|
|
" 7: move.b (%0)+,(%1)\n" \
|
|
" 8: dbf %2,7b\n" \
|
|
" moveq.l #0, %2\n" \
|
|
" 9: \n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
" .even\n" \
|
|
"90: moveq.l #1, %2\n" \
|
|
" jra 9b\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 4\n" \
|
|
" .long 1b,90b\n" \
|
|
" .long 3b,90b\n" \
|
|
" .long 31b,90b\n" \
|
|
" .long 32b,90b\n" \
|
|
" .long 33b,90b\n" \
|
|
" .long 34b,90b\n" \
|
|
" .long 35b,90b\n" \
|
|
" .long 36b,90b\n" \
|
|
" .long 37b,90b\n" \
|
|
" .long 5b,90b\n" \
|
|
" .long 7b,90b\n" \
|
|
".previous" \
|
|
: "=a"(s), "=a"(d), "=d"(len) \
|
|
: "0"(s), "1"(d), "2"(len) \
|
|
: "d0")
|
|
|
|
static int macscsi_pwrite (struct Scsi_Host *instance,
|
|
unsigned char *src, int len)
|
|
{
|
|
unsigned char *s;
|
|
volatile unsigned char *d;
|
|
|
|
NCR5380_local_declare();
|
|
NCR5380_setup(instance);
|
|
|
|
s = src;
|
|
d = mac_scsi_drq;
|
|
|
|
/* These conditions are derived from MacOS */
|
|
|
|
while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
|
|
&& (!(NCR5380_read(STATUS_REG) & SR_REQ)
|
|
|| (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
|
|
;
|
|
if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
|
|
printk(KERN_ERR "Error in macscsi_pwrite\n");
|
|
return -1;
|
|
}
|
|
|
|
CP_MEM_TO_IO(s, d, len);
|
|
|
|
if (len != 0) {
|
|
printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* These control the behaviour of the generic 5380 core */
|
|
#define AUTOSENSE
|
|
#define PSEUDO_DMA
|
|
|
|
#include "NCR5380.c"
|
|
|
|
static struct scsi_host_template driver_template = {
|
|
.proc_name = "Mac5380",
|
|
.proc_info = macscsi_proc_info,
|
|
.name = "Macintosh NCR5380 SCSI",
|
|
.detect = macscsi_detect,
|
|
.release = macscsi_release,
|
|
.info = macscsi_info,
|
|
.queuecommand = macscsi_queue_command,
|
|
.eh_abort_handler = macscsi_abort,
|
|
.eh_bus_reset_handler = macscsi_bus_reset,
|
|
.can_queue = CAN_QUEUE,
|
|
.this_id = 7,
|
|
.sg_tablesize = SG_ALL,
|
|
.cmd_per_lun = CMD_PER_LUN,
|
|
.unchecked_isa_dma = 0,
|
|
.use_clustering = DISABLE_CLUSTERING
|
|
};
|
|
|
|
|
|
#include "scsi_module.c"
|