diff options
Diffstat (limited to 'drivers/ide/legacy/dtc2278.c')
| -rw-r--r-- | drivers/ide/legacy/dtc2278.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/drivers/ide/legacy/dtc2278.c b/drivers/ide/legacy/dtc2278.c new file mode 100644 index 000000000000..20eb5b872ca9 --- /dev/null +++ b/drivers/ide/legacy/dtc2278.c @@ -0,0 +1,165 @@ +/* + * linux/drivers/ide/legacy/dtc2278.c Version 0.02 Feb 10, 1996 + * + * Copyright (C) 1996 Linus Torvalds & author (see below) + */ + +#undef REALLY_SLOW_IO /* most 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> + +/* + * Changing this #undef to #define may solve start up problems in some systems. + */ +#undef ALWAYS_SET_DTC2278_PIO_MODE + +/* + * From: andy@cercle.cts.com (Dyan Wile) + * + * Below is a patch for DTC-2278 - alike software-programmable controllers + * The code enables the secondary IDE controller and the PIO4 (3?) timings on + * the primary (EIDE). You may probably have to enable the 32-bit support to + * get the full speed. You better get the disk interrupts disabled ( hdparm -u0 + * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my + * filesystem corrupted with -u1, but under heavy disk load only :-) + * + * This card is now forced to use the "serialize" feature, + * and irq-unmasking is disallowed. If io_32bit is enabled, + * it must be done for BOTH drives on each interface. + * + * This code was written for the DTC2278E, but might work with any of these: + * + * DTC2278S has only a single IDE interface. + * DTC2278D has two IDE interfaces and is otherwise identical to the S version. + * DTC2278E also has serial ports and a printer port + * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu> + * + * There may be a fourth controller type. The S and D versions use the + * Winbond chip, and I think the E version does also. + * + */ + +static void sub22 (char b, char c) +{ + int i; + + for(i = 0; i < 3; ++i) { + inb(0x3f6); + outb_p(b,0xb0); + inb(0x3f6); + outb_p(c,0xb4); + inb(0x3f6); + if(inb(0xb4) == c) { + outb_p(7,0xb0); + inb(0x3f6); + return; /* success */ + } + } +} + +static void tune_dtc2278 (ide_drive_t *drive, u8 pio) +{ + unsigned long flags; + + pio = ide_get_best_pio_mode(drive, pio, 4, NULL); + + if (pio >= 3) { + spin_lock_irqsave(&ide_lock, flags); + /* + * This enables PIO mode4 (3?) on the first interface + */ + sub22(1,0xc3); + sub22(0,0xa0); + spin_unlock_irqrestore(&ide_lock, flags); + } else { + /* we don't know how to set it back again.. */ + } + + /* + * 32bit I/O has to be enabled for *both* drives at the same time. + */ + drive->io_32bit = 1; + HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1; +} + +static int __init probe_dtc2278(void) +{ + unsigned long flags; + ide_hwif_t *hwif, *mate; + + hwif = &ide_hwifs[0]; + mate = &ide_hwifs[1]; + + if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown) + return 1; + + local_irq_save(flags); + /* + * This enables the second interface + */ + outb_p(4,0xb0); + inb(0x3f6); + outb_p(0x20,0xb4); + inb(0x3f6); +#ifdef ALWAYS_SET_DTC2278_PIO_MODE + /* + * This enables PIO mode4 (3?) on the first interface + * and may solve start-up problems for some people. + */ + sub22(1,0xc3); + sub22(0,0xa0); +#endif + local_irq_restore(flags); + + hwif->serialized = 1; + hwif->chipset = ide_dtc2278; + hwif->tuneproc = &tune_dtc2278; + hwif->drives[0].no_unmask = 1; + hwif->drives[1].no_unmask = 1; + hwif->mate = mate; + + mate->serialized = 1; + mate->chipset = ide_dtc2278; + mate->drives[0].no_unmask = 1; + mate->drives[1].no_unmask = 1; + 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 dtc2278_init(void) +{ + if (probe_dtc2278()) { + printk(KERN_ERR "dtc2278: ide interfaces already in use!\n"); + return -EBUSY; + } + return 0; +} + +#ifdef MODULE +module_init(dtc2278_init); +#endif + +MODULE_AUTHOR("See Local File"); +MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets"); +MODULE_LICENSE("GPL"); |