1/* 2 * Copyright (C) 1996 Linus Torvalds & author (see below) 3 */ 4 5#include <linux/module.h> 6#include <linux/types.h> 7#include <linux/kernel.h> 8#include <linux/delay.h> 9#include <linux/timer.h> 10#include <linux/mm.h> 11#include <linux/ioport.h> 12#include <linux/blkdev.h> 13#include <linux/ide.h> 14#include <linux/init.h> 15 16#include <asm/io.h> 17 18#define DRV_NAME "dtc2278" 19 20/* 21 * Changing this #undef to #define may solve start up problems in some systems. 22 */ 23#undef ALWAYS_SET_DTC2278_PIO_MODE 24 25/* 26 * From: andy@cercle.cts.com (Dyan Wile) 27 * 28 * Below is a patch for DTC-2278 - alike software-programmable controllers 29 * The code enables the secondary IDE controller and the PIO4 (3?) timings on 30 * the primary (EIDE). You may probably have to enable the 32-bit support to 31 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0 32 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my 33 * filesystem corrupted with -u1, but under heavy disk load only :-) 34 * 35 * This card is now forced to use the "serialize" feature, 36 * and irq-unmasking is disallowed. If io_32bit is enabled, 37 * it must be done for BOTH drives on each interface. 38 * 39 * This code was written for the DTC2278E, but might work with any of these: 40 * 41 * DTC2278S has only a single IDE interface. 42 * DTC2278D has two IDE interfaces and is otherwise identical to the S version. 43 * DTC2278E also has serial ports and a printer port 44 * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu> 45 * 46 * There may be a fourth controller type. The S and D versions use the 47 * Winbond chip, and I think the E version does also. 48 * 49 */ 50 51static void sub22 (char b, char c) 52{ 53 int i; 54 55 for(i = 0; i < 3; ++i) { 56 inb(0x3f6); 57 outb_p(b,0xb0); 58 inb(0x3f6); 59 outb_p(c,0xb4); 60 inb(0x3f6); 61 if(inb(0xb4) == c) { 62 outb_p(7,0xb0); 63 inb(0x3f6); 64 return; /* success */ 65 } 66 } 67} 68 69static DEFINE_SPINLOCK(dtc2278_lock); 70 71static void dtc2278_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive) 72{ 73 unsigned long flags; 74 75 if (drive->pio_mode >= XFER_PIO_3) { 76 spin_lock_irqsave(&dtc2278_lock, flags); 77 /* 78 * This enables PIO mode4 (3?) on the first interface 79 */ 80 sub22(1,0xc3); 81 sub22(0,0xa0); 82 spin_unlock_irqrestore(&dtc2278_lock, flags); 83 } else { 84 /* we don't know how to set it back again.. */ 85 /* Actually we do - there is a data sheet available for the 86 Winbond but does anyone actually care */ 87 } 88} 89 90static const struct ide_port_ops dtc2278_port_ops = { 91 .set_pio_mode = dtc2278_set_pio_mode, 92}; 93 94static const struct ide_port_info dtc2278_port_info __initdata = { 95 .name = DRV_NAME, 96 .chipset = ide_dtc2278, 97 .port_ops = &dtc2278_port_ops, 98 .host_flags = IDE_HFLAG_SERIALIZE | 99 IDE_HFLAG_NO_UNMASK_IRQS | 100 IDE_HFLAG_IO_32BIT | 101 /* disallow ->io_32bit changes */ 102 IDE_HFLAG_NO_IO_32BIT | 103 IDE_HFLAG_NO_DMA | 104 IDE_HFLAG_DTC2278, 105 .pio_mask = ATA_PIO4, 106}; 107 108static int __init dtc2278_probe(void) 109{ 110 unsigned long flags; 111 112 local_irq_save(flags); 113 /* 114 * This enables the second interface 115 */ 116 outb_p(4,0xb0); 117 inb(0x3f6); 118 outb_p(0x20,0xb4); 119 inb(0x3f6); 120#ifdef ALWAYS_SET_DTC2278_PIO_MODE 121 /* 122 * This enables PIO mode4 (3?) on the first interface 123 * and may solve start-up problems for some people. 124 */ 125 sub22(1,0xc3); 126 sub22(0,0xa0); 127#endif 128 local_irq_restore(flags); 129 130 return ide_legacy_device_add(&dtc2278_port_info, 0); 131} 132 133static int probe_dtc2278; 134 135module_param_named(probe, probe_dtc2278, bool, 0); 136MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets"); 137 138static int __init dtc2278_init(void) 139{ 140 if (probe_dtc2278 == 0) 141 return -ENODEV; 142 143 if (dtc2278_probe()) { 144 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n"); 145 return -EBUSY; 146 } 147 return 0; 148} 149 150module_init(dtc2278_init); 151 152MODULE_AUTHOR("See Local File"); 153MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets"); 154MODULE_LICENSE("GPL"); 155