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/*
* linux/drivers/block/ali14xx.c Version 0.03 Feb 09, 1996
*
* Copyright (C) 1996 Linus Torvalds & author (see below)
*/
/*
* ALI M14xx chipset EIDE controller
*
* Works for ALI M1439/1443/1445/1487/1489 chipsets.
*
* Adapted from code developed by derekn@vw.ece.cmu.edu. -ml
* Derek's notes follow:
*
* I think the code should be pretty understandable,
* but I'll be happy to (try to) answer questions.
*
* The critical part is in the setupDrive function. The initRegisters
* function doesn't seem to be necessary, but the DOS driver does it, so
* I threw it in.
*
* I've only tested this on my system, which only has one disk. I posted
* it to comp.sys.linux.hardware, so maybe some other people will try it
* out.
*
* Derek Noonburg (derekn@ece.cmu.edu)
* 95-sep-26
*
* Update 96-jul-13:
*
* I've since upgraded to two disks and a CD-ROM, with no trouble, and
* I've also heard from several others who have used it successfully.
* This driver appears to work with both the 1443/1445 and the 1487/1489
* chipsets. I've added support for PIO mode 4 for the 1487. This
* seems to work just fine on the 1443 also, although I'm not sure it's
* advertised as supporting mode 4. (I've been running a WDC AC21200 in
* mode 4 for a while now with no trouble.) -Derek
*/
#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 <asm/io.h>
#include "ide_modes.h"
/* port addresses for auto-detection */
#define ALI_NUM_PORTS 4
static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4};
/* register initialization data */
typedef struct { byte reg, data; } RegInitializer;
static RegInitializer initData[] __initdata = {
{0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
{0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
{0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
{0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
{0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
{0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
{0x35, 0x03}, {0x00, 0x00}
};
#define ALI_MAX_PIO 4
/* timing parameter registers for each drive */
static struct { byte reg1, reg2, reg3, reg4; } regTab[4] = {
{0x03, 0x26, 0x04, 0x27}, /* drive 0 */
{0x05, 0x28, 0x06, 0x29}, /* drive 1 */
{0x2b, 0x30, 0x2c, 0x31}, /* drive 2 */
{0x2d, 0x32, 0x2e, 0x33}, /* drive 3 */
};
static int basePort = 0; /* base port address */
static int regPort = 0; /* port for register number */
static int dataPort = 0; /* port for register data */
static byte regOn; /* output to base port to access registers */
static byte regOff; /* output to base port to close registers */
/*------------------------------------------------------------------------*/
/*
* Read a controller register.
*/
static inline byte inReg (byte reg)
{
outb_p(reg, regPort);
return inb(dataPort);
}
/*
* Write a controller register.
*/
static void outReg (byte data, byte reg)
{
outb_p(reg, regPort);
outb_p(data, dataPort);
}
/*
* Set PIO mode for the specified drive.
* This function computes timing parameters
* and sets controller registers accordingly.
*/
static void ali14xx_tune_drive (ide_drive_t *drive, byte pio)
{
int driveNum;
int time1, time2;
byte param1, param2, param3, param4;
unsigned long flags;
ide_pio_data_t d;
int bus_speed = ide_system_bus_speed();
pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO, &d);
/* calculate timing, according to PIO mode */
time1 = d.cycle_time;
time2 = ide_pio_timings[pio].active_time;
param3 = param1 = (time2 * bus_speed + 999) / 1000;
param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
if (pio < 3) {
param3 += 8;
param4 += 8;
}
printk("%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
drive->name, pio, time1, time2, param1, param2, param3, param4);
/* stuff timing parameters into controller registers */
driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit;
save_flags(flags); /* all CPUs */
cli(); /* all CPUs */
outb_p(regOn, basePort);
outReg(param1, regTab[driveNum].reg1);
outReg(param2, regTab[driveNum].reg2);
outReg(param3, regTab[driveNum].reg3);
outReg(param4, regTab[driveNum].reg4);
outb_p(regOff, basePort);
restore_flags(flags); /* all CPUs */
}
/*
* Auto-detect the IDE controller port.
*/
static int __init findPort (void)
{
int i;
byte t;
unsigned long flags;
__save_flags(flags); /* local CPU only */
__cli(); /* local CPU only */
for (i = 0; i < ALI_NUM_PORTS; ++i) {
basePort = ports[i];
regOff = inb(basePort);
for (regOn = 0x30; regOn <= 0x33; ++regOn) {
outb_p(regOn, basePort);
if (inb(basePort) == regOn) {
regPort = basePort + 4;
dataPort = basePort + 8;
t = inReg(0) & 0xf0;
outb_p(regOff, basePort);
__restore_flags(flags); /* local CPU only */
if (t != 0x50)
return 0;
return 1; /* success */
}
}
outb_p(regOff, basePort);
}
__restore_flags(flags); /* local CPU only */
return 0;
}
/*
* Initialize controller registers with default values.
*/
static int __init initRegisters (void) {
RegInitializer *p;
byte t;
unsigned long flags;
__save_flags(flags); /* local CPU only */
__cli(); /* local CPU only */
outb_p(regOn, basePort);
for (p = initData; p->reg != 0; ++p)
outReg(p->data, p->reg);
outb_p(0x01, regPort);
t = inb(regPort) & 0x01;
outb_p(regOff, basePort);
__restore_flags(flags); /* local CPU only */
return t;
}
void __init init_ali14xx (void)
{
/* auto-detect IDE controller port */
if (!findPort()) {
printk("\nali14xx: not found");
return;
}
printk("\nali14xx: base= 0x%03x, regOn = 0x%02x", basePort, regOn);
ide_hwifs[0].chipset = ide_ali14xx;
ide_hwifs[1].chipset = ide_ali14xx;
ide_hwifs[0].tuneproc = &ali14xx_tune_drive;
ide_hwifs[1].tuneproc = &ali14xx_tune_drive;
ide_hwifs[0].mate = &ide_hwifs[1];
ide_hwifs[1].mate = &ide_hwifs[0];
ide_hwifs[1].channel = 1;
/* initialize controller registers */
if (!initRegisters()) {
printk("\nali14xx: Chip initialization failed");
return;
}
}
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