| /* |
| * linux/drivers/ide/legacy/dtc2278.c Version 0.02 Feb 10, 1996 |
| * |
| * Copyright (C) 1996 Linus Torvalds & author (see below) |
| */ |
| |
| #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/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 DEFINE_SPINLOCK(dtc2278_lock); |
| |
| static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio) |
| { |
| unsigned long flags; |
| |
| if (pio >= 3) { |
| spin_lock_irqsave(&dtc2278_lock, flags); |
| /* |
| * This enables PIO mode4 (3?) on the first interface |
| */ |
| sub22(1,0xc3); |
| sub22(0,0xa0); |
| spin_unlock_irqrestore(&dtc2278_lock, flags); |
| } else { |
| /* we don't know how to set it back again.. */ |
| /* Actually we do - there is a data sheet available for the |
| Winbond but does anyone actually care */ |
| } |
| |
| /* |
| * 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 dtc2278_probe(void) |
| { |
| unsigned long flags; |
| ide_hwif_t *hwif, *mate; |
| static u8 idx[4] = { 0, 1, 0xff, 0xff }; |
| |
| 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->pio_mask = ATA_PIO4; |
| hwif->set_pio_mode = &dtc2278_set_pio_mode; |
| hwif->drives[0].no_unmask = 1; |
| hwif->drives[1].no_unmask = 1; |
| hwif->mate = mate; |
| |
| mate->serialized = 1; |
| mate->chipset = ide_dtc2278; |
| mate->pio_mask = ATA_PIO4; |
| mate->drives[0].no_unmask = 1; |
| mate->drives[1].no_unmask = 1; |
| mate->mate = hwif; |
| mate->channel = 1; |
| |
| ide_device_add(idx); |
| |
| return 0; |
| } |
| |
| int probe_dtc2278 = 0; |
| |
| module_param_named(probe, probe_dtc2278, bool, 0); |
| MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets"); |
| |
| static int __init dtc2278_init(void) |
| { |
| if (probe_dtc2278 == 0) |
| return -ENODEV; |
| |
| if (dtc2278_probe()) { |
| printk(KERN_ERR "dtc2278: ide interfaces already in use!\n"); |
| return -EBUSY; |
| } |
| return 0; |
| } |
| |
| module_init(dtc2278_init); |
| |
| MODULE_AUTHOR("See Local File"); |
| MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets"); |
| MODULE_LICENSE("GPL"); |