Viewing file:  t128.c (9.28 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
#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,irq\n");
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 disabled\n", 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"
|