diff options
Diffstat (limited to 'drivers/ide/legacy/umc8672.c')
| -rw-r--r-- | drivers/ide/legacy/umc8672.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/ide/legacy/umc8672.c b/drivers/ide/legacy/umc8672.c new file mode 100644 index 000000000000..cdbdb2ff9f15 --- /dev/null +++ b/drivers/ide/legacy/umc8672.c @@ -0,0 +1,183 @@ +/* + * linux/drivers/ide/legacy/umc8672.c Version 0.05 Jul 31, 1996 + * + * 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/config.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/hdreg.h> +#include <linux/ide.h> +#include <linux/init.h> + +#include <asm/io.h> + +/* + * 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] = { + {0xf, 0xb, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 }, + {0x3, 0x2, 0x2, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 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 tune_umc (ide_drive_t *drive, u8 pio) +{ + unsigned long flags; + ide_hwgroup_t *hwgroup = ide_hwifs[HWIF(drive)->index^1].hwgroup; + + pio = ide_get_best_pio_mode(drive, pio, 4, NULL); + 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 (hwgroup && hwgroup->handler != NULL) { + 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 int __init umc8672_probe(void) +{ + unsigned long flags; + ide_hwif_t *hwif, *mate; + + 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); + + hwif = &ide_hwifs[0]; + mate = &ide_hwifs[1]; + + hwif->chipset = ide_umc8672; + hwif->tuneproc = &tune_umc; + hwif->mate = mate; + + mate->chipset = ide_umc8672; + mate->tuneproc = &tune_umc; + mate->mate = hwif; + mate->channel = 1; + + probe_hwif_init(hwif); + probe_hwif_init(mate); + + create_proc_ide_interfaces(); + + return 0; +} + +/* Can be called directly from ide.c. */ +int __init umc8672_init(void) +{ + if (umc8672_probe()) + return -ENODEV; + return 0; +} + +#ifdef MODULE +module_init(umc8672_init); +#endif + +MODULE_AUTHOR("Wolfram Podien"); +MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset"); +MODULE_LICENSE("GPL"); |