t128.c
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上传日期:2013-04-10
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- #define AUTOSENSE
- #define PSEUDO_DMA
- /*
- * Trantor T128/T128F/T228 driver
- * Note : architecturally, the T100 and T130 are different and won't
- * work
- *
- * Copyright 1993, Drew Eckhardt
- * Visionary Computing
- * (Unix and Linux consulting and custom programming)
- * drew@colorado.edu
- * +1 (303) 440-4894
- *
- * DISTRIBUTION RELEASE 3.
- *
- * For more information, please consult
- *
- * Trantor Systems, Ltd.
- * T128/T128F/T228 SCSI Host Adapter
- * Hardware Specifications
- *
- * Trantor Systems, Ltd.
- * 5415 Randall Place
- * Fremont, CA 94538
- * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
- *
- * and
- *
- * NCR 5380 Family
- * SCSI Protocol Controller
- * Databook
- *
- * NCR Microelectronics
- * 1635 Aeroplaza Drive
- * Colorado Springs, CO 80916
- * 1+ (719) 578-3400
- * 1+ (800) 334-5454
- */
- /*
- * Options :
- * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
- * for commands that return with a CHECK CONDITION status.
- *
- * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
- * increase compared to polled I/O.
- *
- * PARITY - enable parity checking. Not supported.
- *
- * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
- * only really want to use this if you're having a problem with
- * dropped characters during high speed communications, and even
- * then, you're going to be better off twiddling with transfersize.
- *
- * The card is detected and initialized in one of several ways :
- * 1. Autoprobe (default) - since the board is memory mapped,
- * a BIOS signature is scanned for to locate the registers.
- * An interrupt is triggered to autoprobe for the interrupt
- * line.
- *
- * 2. With command line overrides - t128=address,irq may be
- * used on the LILO command line to override the defaults.
- *
- * 3. With the T128_OVERRIDE compile time define. This is
- * specified as an array of address, irq tuples. Ie, for
- * one board at the default 0xcc000 address, IRQ5, I could say
- * -DT128_OVERRIDE={{0xcc000, 5}}
- *
- * Note that if the override methods are used, place holders must
- * be specified for other boards in the system.
- *
- * T128/T128F jumper/dipswitch settings (note : on my sample, the switches
- * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
- *
- * T128 Sw7 Sw8 Sw6 = 0ws Sw5 = boot
- * T128F Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
- * cc000 off off
- * c8000 off on
- * dc000 on off
- * d8000 on on
- *
- *
- * Interrupts
- * There is a 12 pin jumper block, jp1, numbered as follows :
- * T128 (JP1) T128F (J5)
- * 2 4 6 8 10 12 11 9 7 5 3 1
- * 1 3 5 7 9 11 12 10 8 6 4 2
- *
- * 3 2-4
- * 5 1-3
- * 7 3-5
- * T128F only
- * 10 8-10
- * 12 7-9
- * 14 10-12
- * 15 9-11
- */
- #include <asm/system.h>
- #include <linux/signal.h>
- #include <linux/sched.h>
- #include <asm/io.h>
- #include <linux/blk.h>
- #include "scsi.h"
- #include "hosts.h"
- #include "t128.h"
- #define AUTOPROBE_IRQ
- #include "NCR5380.h"
- #include "constants.h"
- #include "sd.h"
- #include <linux/stat.h>
- #include <linux/init.h>
- #include <linux/module.h>
- static struct override {
- unsigned long address;
- int irq;
- } overrides
- #ifdef T128_OVERRIDE
- [] __initdata = T128_OVERRIDE;
- #else
- [4] __initdata = {
- { 0, IRQ_AUTO},
- { 0, IRQ_AUTO},
- { 0, IRQ_AUTO},
- { 0, IRQ_AUTO}
- };
- #endif
- #define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
- static struct base {
- unsigned int address;
- int noauto;
- } bases[] __initdata = {
- {0xcc000, 0},
- {0xc8000, 0},
- {0xdc000, 0},
- {0xd8000, 0}
- };
- #define NO_BASES (sizeof (bases) / sizeof (struct base))
- static const struct signature {
- const char *string;
- int offset;
- } signatures[] __initdata = {
- {"TSROM: SCSI BIOS, Version 1.12", 0x36},
- };
- #define NO_SIGNATURES (sizeof (signatures) / sizeof (struct signature))
- /**
- * t128_setup
- * @str: command line
- *
- * LILO command line initialization of the overrides array,
- */
- int __init t128_setup(char *str)
- {
- static int commandline_current = 0;
- int ints[10];
- int i;
-
- get_options(str, sizeof(ints) / sizeof(int), ints);
- if (ints[0] != 2)
- printk(KERN_ERR "t128_setup : usage t128=address,irqn");
- else if (commandline_current < NO_OVERRIDES) {
- overrides[commandline_current].address = ints[1];
- overrides[commandline_current].irq = ints[2];
- for (i = 0; i < NO_BASES; ++i)
- if (bases[i].address == ints[1]) {
- bases[i].noauto = 1;
- break;
- }
- ++commandline_current;
- }
- return 1;
- }
- __setup("t128=", t128_setup);
- /**
- * t128_detect - detect controllers
- * @tpnt: SCSI template
- *
- * Detects and initializes T128,T128F, or T228 controllers
- * that were autoprobed, overridden on the LILO command line,
- * or specified at compile time.
- */
- int __init t128_detect(Scsi_Host_Template * tpnt)
- {
- static int current_override = 0, current_base = 0;
- struct Scsi_Host *instance;
- unsigned long base;
- int sig, count;
- tpnt->proc_name = "t128";
- tpnt->proc_info = &t128_proc_info;
- for (count = 0; current_override < NO_OVERRIDES; ++current_override)
- {
- base = 0;
- if (overrides[current_override].address)
- base = overrides[current_override].address;
- else
- for (; !base && (current_base < NO_BASES); ++current_base) {
- for (sig = 0; sig < NO_SIGNATURES; ++sig)
- if (!bases[current_base].noauto &&
- isa_check_signature(bases[current_base].address + signatures[sig].offset,
- signatures[sig].string,
- strlen(signatures[sig].string)))
- {
- base = bases[current_base].address;
- break;
- }
- }
- if (!base)
- break;
- instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
- if (instance == NULL)
- break;
- instance->base = base;
- NCR5380_init(instance, 0);
- if (overrides[current_override].irq != IRQ_AUTO)
- instance->irq = overrides[current_override].irq;
- else
- instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
- if (instance->irq != IRQ_NONE)
- if (request_irq(instance->irq, do_t128_intr, SA_INTERRUPT, "t128", NULL))
- {
- printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabledn", instance->host_no, instance->irq);
- instance->irq = IRQ_NONE;
- }
- if (instance->irq == IRQ_NONE) {
- printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,n", instance->host_no);
- printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.n", instance->host_no);
- }
- printk(KERN_INFO "scsi%d : at 0x%08lx", instance->host_no,instance->base);
- if (instance->irq == IRQ_NONE)
- printk(" interrupts disabled");
- else
- printk(" irq %d", instance->irq);
- printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
- NCR5380_print_options(instance);
- printk("n");
- ++current_override;
- ++count;
- }
- return count;
- }
- /**
- * t128_biosparam - disk geometry
- * @disk: device
- * @dev: device major/minor
- * @ip: array to return results
- *
- * Generates a BIOS / DOS compatible H-C-S mapping for
- * the specified device / size.
- *
- * Most SCSI boards use this mapping, I could be incorrect. Some one
- * using hard disks on a trantor should verify that this mapping
- * corresponds to that used by the BIOS / ASPI driver by running the
- * linux fdisk program and matching the H_C_S coordinates to those
- * that DOS uses.
- */
- int t128_biosparam(Disk * disk, kdev_t dev, int *ip)
- {
- int size = disk->capacity;
- ip[0] = 64;
- ip[1] = 32;
- ip[2] = size >> 11;
- return 0;
- }
- /**
- * NCR5380_pread - pseudo DMA read
- * @instance: controller
- * @dst: buffer to write to
- * @len: expect/max length
- *
- * Fast 5380 pseudo-dma read function, transfers len bytes to
- * dst from the controller.
- */
- static inline int NCR5380_pread(struct Scsi_Host *instance,
- unsigned char *dst, int len)
- {
- unsigned long reg = instance->base + T_DATA_REG_OFFSET;
- unsigned char *d = dst;
- int i = len;
- while (!(isa_readb(instance->base + T_STATUS_REG_OFFSET) & T_ST_RDY))
- barrier();
- for (; i; --i) {
- *d++ = isa_readb(reg);
- }
- if (isa_readb(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
- unsigned char tmp;
- unsigned long foo;
- foo = instance->base + T_CONTROL_REG_OFFSET;
- tmp = isa_readb(foo);
- isa_writeb(tmp | T_CR_CT, foo);
- isa_writeb(tmp, foo);
- printk(KERN_ERR "scsi%d : watchdog timer fired in t128 NCR5380_pread.n", instance->host_no);
- return -1;
- } else
- return 0;
- }
- /**
- * NCR5380_pwrite - pseudo DMA write
- * @instance: controller
- * @dst: buffer to write to
- * @len: expect/max length
- *
- * Fast 5380 pseudo-dma write function, transfers len bytes from
- * dst to the controller.
- */
- static inline int NCR5380_pwrite(struct Scsi_Host *instance,
- unsigned char *src, int len)
- {
- unsigned long reg = instance->base + T_DATA_REG_OFFSET;
- unsigned char *s = src;
- int i = len;
- while (!(isa_readb(instance->base + T_STATUS_REG_OFFSET) & T_ST_RDY))
- barrier();
- for (; i; --i) {
- isa_writeb(*s++, reg);
- }
- if (isa_readb(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
- unsigned char tmp;
- unsigned long foo;
- foo = instance->base + T_CONTROL_REG_OFFSET;
- tmp = isa_readb(foo);
- isa_writeb(tmp | T_CR_CT, foo);
- isa_writeb(tmp, foo);
- printk(KERN_ERR "scsi%d : watchdog timer fired in t128 NCR5380_pwrite()n", instance->host_no);
- return -1;
- } else
- return 0;
- }
- MODULE_LICENSE("GPL");
- #include "NCR5380.c"
- /* Eventually this will go into an include file, but this will be later */
- static Scsi_Host_Template driver_template = TRANTOR_T128;
- #include "scsi_module.c"