/*
* Copyright (C) 1995-1996 Linus Torvalds & author (see below)
*/
/*
* Principal Author/Maintainer: PODIEN@hml2.atlas.de (Wolfram Podien)
*
* This file provides support for the advanced features
* of the UMC 8672 IDE interface.
*
* Version 0.01 Initial version, hacked out of ide.c,
* and #include'd rather than compiled separately.
* This will get cleaned up in a subsequent release.
*
* Version 0.02 now configs/compiles separate from ide.c -ml
* Version 0.03 enhanced auto-tune, fix display bug
* Version 0.05 replace sti() with restore_flags() -ml
* add detection of possible race condition -ml
*/
/*
* VLB Controller Support from
* Wolfram Podien
* Rohoefe 3
* D28832 Achim
* Germany
*
* To enable UMC8672 support there must a lilo line like
* append="ide0=umc8672"...
* To set the speed according to the abilities of the hardware there must be a
* line like
* #define UMC_DRIVE0 11
* in the beginning of the driver, which sets the speed of drive 0 to 11 (there
* are some lines present). 0 - 11 are allowed speed values. These values are
* the results from the DOS speed test program supplied from UMC. 11 is the
* highest speed (about PIO mode 3)
*/
#define REALLY_SLOW_IO /* some systems can safely undef this */
#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 "umc8672"
/*
* Default speeds. These can be changed with "auto-tune" and/or hdparm.
*/
#define UMC_DRIVE0 1 /* DOS measured drive speeds */
#define UMC_DRIVE1 1 /* 0 to 11 allowed */
#define UMC_DRIVE2 1 /* 11 = Fastest Speed */
#define UMC_DRIVE3 1 /* In case of crash reduce speed */
static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
static const u8 pio_to_umc [5] = {0, 3, 7, 10, 11}; /* rough guesses */
/* 0 1 2 3 4 5 6 7 8 9 10 11 */
static const u8 speedtab [3][12] = {
{0x0f, 0x0b, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
{0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
{0xff, 0xcb, 0xc0, 0x58, 0x36, 0x33, 0x23, 0x22, 0x21, 0x11, 0x10, 0x0}
};
static void out_umc(char port, char wert)
{
outb_p(port, 0x108);
outb_p(wert, 0x109);
}
static inline u8 in_umc(char port)
{
outb_p(port, 0x108);
return inb_p(0x109);
}
static void umc_set_speeds(u8 speeds[])
{
int i, tmp;
outb_p(0x5A, 0x108); /* enable umc */
out_umc(0xd7, (speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));
out_umc(0xd6, (speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));
tmp = 0;
for (i = 3; i >= 0; i--)
tmp = (tmp << 2) | speedtab[1][speeds[i]];
out_umc(0xdc, tmp);
for (i = 0; i < 4; i++) {
out_umc(0xd0 + i, speedtab[2][speeds[i]]);
out_umc(0xd8 + i, speedtab[2][speeds[i]]);
}
outb_p(0xa5, 0x108); /* disable umc */
printk("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
speeds[0], speeds[1], speeds[2], speeds[3]);
}
static void umc_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
ide_hwif_t *hwif = drive->hwif;
unsigned long flags;
printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
drive->name, pio, pio_to_umc[pio]);
spin_lock_irqsave(&ide_lock, flags);
if (hwif->mate && hwif->mate->hwgroup->handler) {
printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
} else {
current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
umc_set_speeds(current_speeds);
}
spin_unlock_irqrestore(&ide_lock, flags);
}
static const struct ide_port_ops umc8672_port_ops = {
.set_pio_mode = umc_set_pio_mode,
};
static const struct ide_port_info umc8672_port_info __initdata = {
.name = DRV_NAME,
.chipset = ide_umc8672,
.port_ops = &umc8672_port_ops,
.host_flags = IDE_HFLAG_NO_DMA,
.pio_mask = ATA_PIO4,
};
static int __init umc8672_probe(void)
{
unsigned long flags;
if (!request_region(0x108, 2, "umc8672")) {
printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n");
return 1;
}
local_irq_save(flags);
outb_p(0x5A, 0x108); /* enable umc */
if (in_umc (0xd5) != 0xa0) {
local_irq_restore(flags);
printk(KERN_ERR "umc8672: not found\n");
release_region(0x108, 2);
return 1;
}
outb_p(0xa5, 0x108); /* disable umc */
umc_set_speeds(current_speeds);
local_irq_restore(flags);
return ide_legacy_device_add(&umc8672_port_info, 0);
}
static int probe_umc8672;
module_param_named(probe, probe_umc8672, bool, 0);
MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
static int __init umc8672_init(void)
{
if (probe_umc8672 == 0)
goto out;
if (umc8672_probe() == 0)
return 0;;
out:
return -ENODEV;;
}
module_init(umc8672_init);
MODULE_AUTHOR("Wolfram Podien");
MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
MODULE_LICENSE("GPL");
