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/*
* 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
*/
#include <linux/module.h>
#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/ide.h>
#include <linux/init.h>
#include <asm/io.h>
#define DRV_NAME "ali14xx"
/* port addresses for auto-detection */
#define ALI_NUM_PORTS 4
static const int ports[ALI_NUM_PORTS] __initdata =
{ 0x074, 0x0f4, 0x034, 0x0e4 };
/* register initialization data */
typedef struct { u8 reg, data; } RegInitializer;
static const 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}
};
/* timing parameter registers for each drive */
static struct { u8 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; /* base port address */
static int regPort; /* port for register number */
static int dataPort; /* port for register data */
static u8 regOn; /* output to base port to access registers */
static u8 regOff; /* output to base port to close registers */
/*------------------------------------------------------------------------*/
/*
* Read a controller register.
*/
static inline u8 inReg(u8 reg)
{
outb_p(reg, regPort);
return inb(dataPort);
}
/*
* Write a controller register.
*/
static void outReg(u8 data, u8 reg)
{
outb_p(reg, regPort);
outb_p(data, dataPort);
}
static DEFINE_SPINLOCK(ali14xx_lock);
/*
* Set PIO mode for the specified drive.
* This function computes timing parameters
* and sets controller registers accordingly.
*/
static void ali14xx_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
int driveNum;
int time1, time2;
u8 param1, param2, param3, param4;
unsigned long flags;
int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
/* calculate timing, according to PIO mode */
time1 = ide_pio_cycle_time(drive, pio);
time2 = t->active;
param3 = param1 = (time2 * bus_speed + 999) / 1000;
param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
if (pio < 3) {
param3 += 8;
param4 += 8;
}
printk(KERN_DEBUG "%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;
spin_lock_irqsave(&ali14xx_lock, flags);
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);
spin_unlock_irqrestore(&ali14xx_lock, flags);
}
/*
* Auto-detect the IDE controller port.
*/
static int __init findPort(void)
{
int i;
u8 t;
unsigned long flags;
local_irq_save(flags);
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);
local_irq_restore(flags);
if (t != 0x50)
return 0;
return 1; /* success */
}
}
outb_p(regOff, basePort);
}
local_irq_restore(flags);
return 0;
}
/*
* Initialize controller registers with default values.
*/
static int __init initRegisters(void)
{
const RegInitializer *p;
u8 t;
unsigned long flags;
local_irq_save(flags);
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);
local_irq_restore(flags);
return t;
}
static const struct ide_port_ops ali14xx_port_ops = {
.set_pio_mode = ali14xx_set_pio_mode,
};
static const struct ide_port_info ali14xx_port_info = {
.name = DRV_NAME,
.chipset = ide_ali14xx,
.port_ops = &ali14xx_port_ops,
.host_flags = IDE_HFLAG_NO_DMA,
.pio_mask = ATA_PIO4,
};
static int __init ali14xx_probe(void)
{
printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
basePort, regOn);
/* initialize controller registers */
if (!initRegisters()) {
printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
return 1;
}
return ide_legacy_device_add(&ali14xx_port_info, 0);
}
static int probe_ali14xx;
module_param_named(probe, probe_ali14xx, bool, 0);
MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
static int __init ali14xx_init(void)
{
if (probe_ali14xx == 0)
goto out;
/* auto-detect IDE controller port */
if (findPort()) {
if (ali14xx_probe())
return -ENODEV;
return 0;
}
printk(KERN_ERR "ali14xx: not found.\n");
out:
return -ENODEV;
}
module_init(ali14xx_init);
MODULE_AUTHOR("see local file");
MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
MODULE_LICENSE("GPL");
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