diff options
Diffstat (limited to 'drivers/ide/umc8672.c')
| -rw-r--r-- | drivers/ide/umc8672.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/ide/umc8672.c b/drivers/ide/umc8672.c new file mode 100644 index 00000000..47adcd09 --- /dev/null +++ b/drivers/ide/umc8672.c @@ -0,0 +1,183 @@ +/* + * 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_hwif_t *hwif, ide_drive_t *drive) +{ + ide_hwif_t *mate = hwif->mate; + unsigned long uninitialized_var(flags); + const u8 pio = drive->pio_mode - XFER_PIO_0; + + printk("%s: setting umc8672 to PIO mode%d (speed %d)\n", + drive->name, pio, pio_to_umc[pio]); + if (mate) + spin_lock_irqsave(&mate->lock, flags); + if (mate && mate->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); + } + if (mate) + spin_unlock_irqrestore(&mate->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"); |