linux/drivers/ide/dtc2278.c
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   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 __initconst = {
  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 bool 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
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