1/* 2 * linux/drivers/ide/dtc2278.c Version 0.02 Feb 10, 1996 3 * 4 * Copyright (C) 1996 Linus Torvalds & author (see below) 5 */ 6 7#undef REALLY_SLOW_IO /* most systems can safely undef this */ 8 9#include <linux/types.h> 10#include <linux/kernel.h> 11#include <linux/delay.h> 12#include <linux/timer.h> 13#include <linux/mm.h> 14#include <linux/ioport.h> 15#include <linux/blkdev.h> 16#include <linux/hdreg.h> 17#include <linux/ide.h> 18#include <linux/init.h> 19 20#include <asm/io.h> 21 22#include "ide_modes.h" 23 24/* 25 * Changing this #undef to #define may solve start up problems in some systems. 26 */ 27#undef ALWAYS_SET_DTC2278_PIO_MODE 28 29/* 30 * From: andy@cercle.cts.com (Dyan Wile) 31 * 32 * Below is a patch for DTC-2278 - alike software-programmable controllers 33 * The code enables the secondary IDE controller and the PIO4 (3?) timings on 34 * the primary (EIDE). You may probably have to enable the 32-bit support to 35 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0 36 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my 37 * filesystem corrupted with -u1, but under heavy disk load only :-) 38 * 39 * This card is now forced to use the "serialize" feature, 40 * and irq-unmasking is disallowed. If io_32bit is enabled, 41 * it must be done for BOTH drives on each interface. 42 * 43 * This code was written for the DTC2278E, but might work with any of these: 44 * 45 * DTC2278S has only a single IDE interface. 46 * DTC2278D has two IDE interfaces and is otherwise identical to the S version. 47 * DTC2278E also has serial ports and a printer port 48 * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu> 49 * 50 * There may be a fourth controller type. The S and D versions use the 51 * Winbond chip, and I think the E version does also. 52 * 53 */ 54 55static void sub22 (char b, char c) 56{ 57 int i; 58 59 for(i = 0; i < 3; ++i) { 60 inb(0x3f6); 61 outb_p(b,0xb0); 62 inb(0x3f6); 63 outb_p(c,0xb4); 64 inb(0x3f6); 65 if(inb(0xb4) == c) { 66 outb_p(7,0xb0); 67 inb(0x3f6); 68 return; /* success */ 69 } 70 } 71} 72 73static void tune_dtc2278 (ide_drive_t *drive, byte pio) 74{ 75 unsigned long flags; 76 77 pio = ide_get_best_pio_mode(drive, pio, 4, NULL); 78 79 if (pio >= 3) { 80 save_flags(flags); /* all CPUs */ 81 cli(); /* all CPUs */ 82 /* 83 * This enables PIO mode4 (3?) on the first interface 84 */ 85 sub22(1,0xc3); 86 sub22(0,0xa0); 87 restore_flags(flags); /* all CPUs */ 88 } else { 89 /* we don't know how to set it back again.. */ 90 } 91 92 /* 93 * 32bit I/O has to be enabled for *both* drives at the same time. 94 */ 95 drive->io_32bit = 1; 96 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1; 97} 98 99void __init init_dtc2278 (void) 100{ 101 unsigned long flags; 102 103 __save_flags(flags); /* local CPU only */ 104 __cli(); /* local CPU only */ 105 /* 106 * This enables the second interface 107 */ 108 outb_p(4,0xb0); 109 inb(0x3f6); 110 outb_p(0x20,0xb4); 111 inb(0x3f6); 112#ifdef ALWAYS_SET_DTC2278_PIO_MODE 113 /* 114 * This enables PIO mode4 (3?) on the first interface 115 * and may solve start-up problems for some people. 116 */ 117 sub22(1,0xc3); 118 sub22(0,0xa0); 119#endif 120 __restore_flags(flags); /* local CPU only */ 121 122 ide_hwifs[0].serialized = 1; 123 ide_hwifs[1].serialized = 1; 124 ide_hwifs[0].chipset = ide_dtc2278; 125 ide_hwifs[1].chipset = ide_dtc2278; 126 ide_hwifs[0].tuneproc = &tune_dtc2278; 127 ide_hwifs[0].drives[0].no_unmask = 1; 128 ide_hwifs[0].drives[1].no_unmask = 1; 129 ide_hwifs[1].drives[0].no_unmask = 1; 130 ide_hwifs[1].drives[1].no_unmask = 1; 131 ide_hwifs[0].mate = &ide_hwifs[1]; 132 ide_hwifs[1].mate = &ide_hwifs[0]; 133 ide_hwifs[1].channel = 1; 134} 135