185 lines
5.0 KiB
C
185 lines
5.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 1995-1996 Linus Torvalds & author (see below)
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*/
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/*
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* Principal Author/Maintainer: PODIEN@hml2.atlas.de (Wolfram Podien)
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*
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* This file provides support for the advanced features
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* of the UMC 8672 IDE interface.
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*
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* Version 0.01 Initial version, hacked out of ide.c,
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* and #include'd rather than compiled separately.
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* This will get cleaned up in a subsequent release.
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*
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* Version 0.02 now configs/compiles separate from ide.c -ml
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* Version 0.03 enhanced auto-tune, fix display bug
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* Version 0.05 replace sti() with restore_flags() -ml
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* add detection of possible race condition -ml
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*/
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/*
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* VLB Controller Support from
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* Wolfram Podien
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* Rohoefe 3
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* D28832 Achim
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* Germany
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*
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* To enable UMC8672 support there must a lilo line like
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* append="ide0=umc8672"...
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* To set the speed according to the abilities of the hardware there must be a
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* line like
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* #define UMC_DRIVE0 11
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* in the beginning of the driver, which sets the speed of drive 0 to 11 (there
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* are some lines present). 0 - 11 are allowed speed values. These values are
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* the results from the DOS speed test program supplied from UMC. 11 is the
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* highest speed (about PIO mode 3)
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*/
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#define REALLY_SLOW_IO /* some systems can safely undef this */
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/blkdev.h>
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#include <linux/ide.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#define DRV_NAME "umc8672"
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/*
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* Default speeds. These can be changed with "auto-tune" and/or hdparm.
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*/
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#define UMC_DRIVE0 1 /* DOS measured drive speeds */
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#define UMC_DRIVE1 1 /* 0 to 11 allowed */
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#define UMC_DRIVE2 1 /* 11 = Fastest Speed */
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#define UMC_DRIVE3 1 /* In case of crash reduce speed */
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static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
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static const u8 pio_to_umc [5] = {0, 3, 7, 10, 11}; /* rough guesses */
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/* 0 1 2 3 4 5 6 7 8 9 10 11 */
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static const u8 speedtab [3][12] = {
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{0x0f, 0x0b, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
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{0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
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{0xff, 0xcb, 0xc0, 0x58, 0x36, 0x33, 0x23, 0x22, 0x21, 0x11, 0x10, 0x0}
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};
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static void out_umc(char port, char wert)
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{
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outb_p(port, 0x108);
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outb_p(wert, 0x109);
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}
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static inline u8 in_umc(char port)
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{
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outb_p(port, 0x108);
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return inb_p(0x109);
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}
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static void umc_set_speeds(u8 speeds[])
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{
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int i, tmp;
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outb_p(0x5A, 0x108); /* enable umc */
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out_umc(0xd7, (speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));
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out_umc(0xd6, (speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));
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tmp = 0;
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for (i = 3; i >= 0; i--)
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tmp = (tmp << 2) | speedtab[1][speeds[i]];
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out_umc(0xdc, tmp);
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for (i = 0; i < 4; i++) {
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out_umc(0xd0 + i, speedtab[2][speeds[i]]);
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out_umc(0xd8 + i, speedtab[2][speeds[i]]);
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}
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outb_p(0xa5, 0x108); /* disable umc */
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printk("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
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speeds[0], speeds[1], speeds[2], speeds[3]);
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}
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static void umc_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
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{
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ide_hwif_t *mate = hwif->mate;
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unsigned long flags;
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const u8 pio = drive->pio_mode - XFER_PIO_0;
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printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
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drive->name, pio, pio_to_umc[pio]);
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if (mate)
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spin_lock_irqsave(&mate->lock, flags);
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if (mate && mate->handler) {
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printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
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} else {
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current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
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umc_set_speeds(current_speeds);
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}
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if (mate)
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spin_unlock_irqrestore(&mate->lock, flags);
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}
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static const struct ide_port_ops umc8672_port_ops = {
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.set_pio_mode = umc_set_pio_mode,
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};
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static const struct ide_port_info umc8672_port_info __initconst = {
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.name = DRV_NAME,
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.chipset = ide_umc8672,
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.port_ops = &umc8672_port_ops,
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.host_flags = IDE_HFLAG_NO_DMA,
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.pio_mask = ATA_PIO4,
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};
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static int __init umc8672_probe(void)
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{
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unsigned long flags;
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if (!request_region(0x108, 2, "umc8672")) {
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printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n");
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return 1;
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}
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local_irq_save(flags);
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outb_p(0x5A, 0x108); /* enable umc */
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if (in_umc (0xd5) != 0xa0) {
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local_irq_restore(flags);
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printk(KERN_ERR "umc8672: not found\n");
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release_region(0x108, 2);
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return 1;
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}
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outb_p(0xa5, 0x108); /* disable umc */
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umc_set_speeds(current_speeds);
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local_irq_restore(flags);
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return ide_legacy_device_add(&umc8672_port_info, 0);
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}
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static bool probe_umc8672;
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module_param_named(probe, probe_umc8672, bool, 0);
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MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
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static int __init umc8672_init(void)
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{
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if (probe_umc8672 == 0)
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goto out;
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if (umc8672_probe() == 0)
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return 0;
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out:
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return -ENODEV;
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}
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module_init(umc8672_init);
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MODULE_AUTHOR("Wolfram Podien");
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MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
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MODULE_LICENSE("GPL");
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