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/*
* linux/drivers/ide/qd65xx.c Version 0.06 Aug 3, 2000
*
* Copyright (C) 1996-2000 Linus Torvalds & author (see below)
*/
/*
* Version 0.03 Cleaned auto-tune, added probe
* Version 0.04 Added second channel tuning
* Version 0.05 Enhanced tuning ; added qd6500 support
* Version 0.06 added dos driver's list
*
* QDI QD6500/QD6580 EIDE controller fast support
*
* Please set local bus speed using kernel parameter idebus
* for example, "idebus=33" stands for 33Mhz VLbus
* To activate controller support, use "ide0=qd65xx"
* To enable tuning, use "ide0=autotune"
* To enable second channel tuning (qd6580 only), use "ide1=autotune"
*/
/*
* Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
* Samuel Thibault <samuel.thibault@fnac.net>
*/
#undef REALLY_SLOW_IO /* most systems can safely undef this */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <asm/io.h>
#include "ide_modes.h"
#include "qd65xx.h"
/*
* I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
* or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
* -- qd6500 is a single IDE interface
* -- qd6580 is a dual IDE interface
*
* More research on qd6580 being done by willmore@cig.mot.com (David)
* More Information given by Petr Soucek (petr@ryston.cz)
* http://www.ryston.cz/petr/vlb
*/
/*
* base: Timer1
*
*
* base+0x01: Config (R/O)
*
* bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
* bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
* bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
* bit 3: qd6500: 1 = disabled, 0 = enabled
* qd6580: 1
* upper nibble:
* qd6500: 1100
* qd6580: either 1010 or 0101
*
* base+0x02: Timer2 (qd6580 only)
*
*
* base+0x03: Control (qd6580 only)
*
* bits 0-3 must always be set 1
* bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
* bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
* 0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
* channel 1 for hdc & hdd
* bit 1 : 1 = only disks on primary port
* 0 = disks & ATAPI devices on primary port
* bit 2-4 : always 0
* bit 5 : status, but of what ?
* bit 6 : always set 1 by dos driver
* bit 7 : set 1 for non-ATAPI devices on primary port
* (maybe read-ahead and post-write buffer ?)
*/
static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */
static void qd_write_reg (byte content, byte reg)
{
unsigned long flags;
save_flags(flags); /* all CPUs */
cli(); /* all CPUs */
outb(content,reg);
restore_flags(flags); /* all CPUs */
}
byte __init qd_read_reg (byte reg)
{
unsigned long flags;
byte read;
save_flags(flags); /* all CPUs */
cli(); /* all CPUs */
read = inb(reg);
restore_flags(flags); /* all CPUs */
return read;
}
/*
* qd_select:
*
* This routine is invoked from ide.c to prepare for access to a given drive.
*/
static void qd_select (ide_drive_t *drive)
{
byte index = (( (QD_TIMREG(drive)) & 0x80 ) >> 7) |
(QD_TIMREG(drive) & 0x02);
if (timings[index] != QD_TIMING(drive))
qd_write_reg(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
}
/*
* qd6500_compute_timing
*
* computes the timing value where
* lower nibble represents active time, in count of VLB clocks
* upper nibble represents recovery time, in count of VLB clocks
*/
static byte qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
{
byte active_cycle,recovery_cycle;
if (system_bus_clock()<=33) {
active_cycle = 9 - IDE_IN(active_time * system_bus_clock() / 1000 + 1, 2, 9);
recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 0, 15);
} else {
active_cycle = 8 - IDE_IN(active_time * system_bus_clock() / 1000 + 1, 1, 8);
recovery_cycle = 18 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 3, 18);
}
return((recovery_cycle<<4) | 0x08 | active_cycle);
}
/*
* qd6580_compute_timing
*
* idem for qd6580
*/
static byte qd6580_compute_timing (int active_time, int recovery_time)
{
byte active_cycle = 17-IDE_IN(active_time * system_bus_clock() / 1000 + 1, 2, 17);
byte recovery_cycle = 15-IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 2, 15);
return((recovery_cycle<<4) | active_cycle);
}
/*
* qd_find_disk_type
*
* tries to find timing from dos driver's table
*/
static int qd_find_disk_type (ide_drive_t *drive,
int *active_time, int *recovery_time)
{
struct qd65xx_timing_s *p;
char model[40];
if (!*drive->id->model) return 0;
strncpy(model,drive->id->model,40);
ide_fixstring(model,40,1); /* byte-swap */
for (p = qd65xx_timing ; p->offset != -1 ; p++) {
if (!strncmp(p->model, model+p->offset,4)) {
printk(KERN_DEBUG "%s: listed !\n",drive->name);
*active_time = p->active;
*recovery_time = p->recovery;
return 1;
}
}
return 0;
}
/*
* qd_timing_ok:
*
* check whether timings don't conflict
*/
static int qd_timing_ok (ide_drive_t drives[])
{
return (IDE_IMPLY(drives[0].present && drives[1].present,
IDE_IMPLY(QD_TIMREG(drives) == QD_TIMREG(drives+1),
QD_TIMING(drives) == QD_TIMING(drives+1))));
/* if same timing register, must be same timing */
}
/*
* qd_set_timing:
*
* records the timing, and enables selectproc as needed
*/
static void qd_set_timing (ide_drive_t *drive, byte timing)
{
ide_hwif_t *hwif = HWIF(drive);
drive->drive_data &= 0xff00;
drive->drive_data |= timing;
if (qd_timing_ok(hwif->drives)) {
qd_select(drive); /* selects once */
hwif->selectproc = NULL;
} else
hwif->selectproc = &qd_select;
printk(KERN_DEBUG "%s: %#x\n",drive->name,timing);
}
/*
* qd6500_tune_drive
*/
static void qd6500_tune_drive (ide_drive_t *drive, byte pio)
{
int active_time = 175;
int recovery_time = 415; /* worst case values from the dos driver */
if (drive->id && !qd_find_disk_type(drive,&active_time,&recovery_time)
&& drive->id->tPIO && (drive->id->field_valid & 0x02)
&& drive->id->eide_pio >= 240) {
printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
drive->id->tPIO);
active_time = 110;
recovery_time = drive->id->eide_pio - 120;
}
qd_set_timing(drive,qd6500_compute_timing(HWIF(drive),active_time,recovery_time));
}
/*
* qd6580_tune_drive
*/
static void qd6580_tune_drive (ide_drive_t *drive, byte pio)
{
ide_pio_data_t d;
int base = HWIF(drive)->select_data;
int active_time = 175;
int recovery_time = 415; /* worst case values from the dos driver */
if (drive->id && !qd_find_disk_type(drive,&active_time,&recovery_time)) {
pio = ide_get_best_pio_mode(drive, pio, 255, &d);
pio = IDE_MIN(pio,4);
switch (pio) {
case 0: break;
case 3:
if (d.cycle_time >= 110) {
active_time = 86;
recovery_time = d.cycle_time-102;
} else
printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
break;
case 4:
if (d.cycle_time >= 69) {
active_time = 70;
recovery_time = d.cycle_time-61;
} else
printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
break;
default:
if (d.cycle_time >= 180) {
active_time = 110;
recovery_time = d.cycle_time - 120;
} else {
active_time = ide_pio_timings[pio].active_time;
recovery_time = d.cycle_time
-active_time;
}
}
printk(KERN_INFO "%s: PIO mode%d\n",drive->name,pio);
}
if (!HWIF(drive)->channel && drive->media != ide_disk) {
qd_write_reg(0x5f,QD_CONTROL_PORT);
printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO and post-write buffer on %s.\n",drive->name,HWIF(drive)->name);
}
qd_set_timing(drive,qd6580_compute_timing(active_time,recovery_time));
}
/*
* qd_testreg
*
* tests if the given port is a register
*/
static int __init qd_testreg(int port)
{
byte savereg;
byte readreg;
unsigned long flags;
save_flags(flags); /* all CPUs */
cli(); /* all CPUs */
savereg = inb_p(port);
outb_p(QD_TESTVAL,port); /* safe value */
readreg = inb_p(port);
outb(savereg,port);
restore_flags(flags); /* all CPUs */
if (savereg == QD_TESTVAL) {
printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
printk(KERN_ERR "Assuming qd65xx is not present.\n");
return 1;
}
return (readreg != QD_TESTVAL);
}
/*
* probe:
*
* looks at the specified baseport, and if qd found, registers & initialises it
* return 1 if another qd may be probed
*/
int __init probe (int base)
{
byte config;
byte index;
config = qd_read_reg(QD_CONFIG_PORT);
if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) ) return 1;
index = ! (config & QD_CONFIG_IDE_BASEPORT);
if ((config & 0xf0) == QD_CONFIG_QD6500) {
ide_hwif_t *hwif = &ide_hwifs[index];
if (qd_testreg(base)) return 1; /* bad register */
/* qd6500 found */
printk(KERN_NOTICE "%s: qd6500 at %#x\n",
ide_hwifs[index].name, base);
printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
config, QD_ID3);
if (config & QD_CONFIG_DISABLED) {
printk(KERN_WARNING "qd6500 is disabled !\n");
return 1;
}
hwif->chipset = ide_qd65xx;
hwif->select_data = base;
hwif->config_data = config;
hwif->drives[0].drive_data =
hwif->drives[1].drive_data = QD6500_DEF_DATA;
hwif->drives[0].io_32bit =
hwif->drives[1].io_32bit = 1;
hwif->tuneproc = &qd6500_tune_drive;
return 1;
}
if (((config & 0xf0) == QD_CONFIG_QD6580_A) || ((config & 0xf0) == QD_CONFIG_QD6580_B)) {
byte control;
if (qd_testreg(base) || qd_testreg(base+0x02)) return 1;
/* bad registers */
/* qd6580 found */
control = qd_read_reg(QD_CONTROL_PORT);
printk(KERN_NOTICE "qd6580 at %#x\n", base);
printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
config, control, QD_ID3);
if (control & QD_CONTR_SEC_DISABLED) {
ide_hwif_t *hwif = &ide_hwifs[index];
/* secondary disabled */
printk(KERN_INFO "%s: qd6580: single IDE board\n",
ide_hwifs[index].name);
hwif->chipset = ide_qd65xx;
hwif->select_data = base;
hwif->config_data = config | (control <<8);
hwif->drives[0].drive_data =
hwif->drives[1].drive_data = QD6580_DEF_DATA;
hwif->drives[0].io_32bit =
hwif->drives[1].io_32bit = 1;
hwif->tuneproc = &qd6580_tune_drive;
qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);
return 1;
} else {
int i,j;
/* secondary enabled */
printk(KERN_INFO "%s&%s: qd6580: dual IDE board\n",
ide_hwifs[0].name,ide_hwifs[1].name);
for (i=0;i<2;i++) {
ide_hwifs[i].chipset = ide_qd65xx;
ide_hwifs[i].mate = &ide_hwifs[i^1];
ide_hwifs[i].channel = i;
ide_hwifs[i].select_data = base;
ide_hwifs[i].config_data = config | (control <<8);
ide_hwifs[i].tuneproc = &qd6580_tune_drive;
for (j=0;j<2;j++) {
ide_hwifs[i].drives[j].drive_data = QD6580_DEF_DATA;
ide_hwifs[i].drives[j].io_32bit = 1;
}
}
qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);
return 0; /* no other qd65xx possible */
}
}
/* no qd65xx found */
return 1;
}
/*
* init_qd65xx:
*
* called at the very beginning of initialization ; should just probe and link
*/
void __init init_qd65xx (void)
{
if (probe(0x30)) probe(0xb0);
}
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