| /* |
| * Copyright (C) 1996 Linus Torvalds & author (see below) |
| */ |
| |
| #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> |
| |
| #include "ide_modes.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, byte pio) |
| { |
| unsigned long flags; |
| |
| pio = ide_get_best_pio_mode(drive, pio, 4, NULL); |
| |
| if (pio >= 3) { |
| save_flags(flags); /* all CPUs */ |
| cli(); /* all CPUs */ |
| /* |
| * This enables PIO mode4 (3?) on the first interface |
| */ |
| sub22(1,0xc3); |
| sub22(0,0xa0); |
| restore_flags(flags); /* all CPUs */ |
| } 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; |
| } |
| |
| void __init init_dtc2278 (void) |
| { |
| unsigned long flags; |
| |
| __save_flags(flags); /* local CPU only */ |
| __cli(); /* local CPU only */ |
| /* |
| * 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 |
| __restore_flags(flags); /* local CPU only */ |
| |
| ide_hwifs[0].serialized = 1; |
| ide_hwifs[1].serialized = 1; |
| ide_hwifs[0].chipset = ide_dtc2278; |
| ide_hwifs[1].chipset = ide_dtc2278; |
| ide_hwifs[0].tuneproc = &tune_dtc2278; |
| ide_hwifs[0].drives[0].no_unmask = 1; |
| ide_hwifs[0].drives[1].no_unmask = 1; |
| ide_hwifs[1].drives[0].no_unmask = 1; |
| ide_hwifs[1].drives[1].no_unmask = 1; |
| ide_hwifs[0].mate = &ide_hwifs[1]; |
| ide_hwifs[1].mate = &ide_hwifs[0]; |
| ide_hwifs[1].channel = 1; |
| } |