drivers/ide/legacy/dtc2278.c

   1 /*
   2  *  linux/drivers/ide/legacy/dtc2278.c          Version 0.02    Feb 10, 1996
   3  *
   4  *  Copyright (C) 1996  Linus Torvalds & author (see below)
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/delay.h>
  11 #include <linux/timer.h>
  12 #include <linux/mm.h>
  13 #include <linux/ioport.h>
  14 #include <linux/blkdev.h>
  15 #include <linux/hdreg.h>
  16 #include <linux/ide.h>
  17 #include <linux/init.h>
  18
  19 #include <asm/io.h>
  20
  21 /*
  22  * Changing this #undef to #define may solve start up problems in some systems.
  23  */
  24 #undef ALWAYS_SET_DTC2278_PIO_MODE
  25
  26 /*
  27  * From: andy@cercle.cts.com (Dyan Wile)
  28  *
  29  * Below is a patch for DTC-2278 - alike software-programmable controllers
  30  * The code enables the secondary IDE controller and the PIO4 (3?) timings on
  31  * the primary (EIDE). You may probably have to enable the 32-bit support to
  32  * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
  33  * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
  34  * filesystem  corrupted with -u1, but under heavy disk load only :-)
  35  *
  36  * This card is now forced to use the "serialize" feature,
  37  * and irq-unmasking is disallowed.  If io_32bit is enabled,
  38  * it must be done for BOTH drives on each interface.
  39  *
  40  * This code was written for the DTC2278E, but might work with any of these:
  41  *
  42  * DTC2278S has only a single IDE interface.
  43  * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
  44  * DTC2278E also has serial ports and a printer port
  45  * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
  46  *
  47  * There may be a fourth controller type. The S and D versions use the
  48  * Winbond chip, and I think the E version does also.
  49  *
  50  */
  51
  52 static void sub22 (char b, char c)
  53 {
  54         int i;
  55
  56         for(i = 0; i < 3; ++i) {
  57                 inb(0x3f6);
  58                 outb_p(b,0xb0);
  59                 inb(0x3f6);
  60                 outb_p(c,0xb4);
  61                 inb(0x3f6);
  62                 if(inb(0xb4) == c) {
  63                         outb_p(7,0xb0);
  64                         inb(0x3f6);
  65                         return; /* success */
  66                 }
  67         }
  68 }
  69
  70 static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
  71 {
  72         unsigned long flags;
  73
  74         pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
  75
  76         if (pio >= 3) {
  77                 spin_lock_irqsave(&ide_lock, flags);
  78                 /*
  79                  * This enables PIO mode4 (3?) on the first interface
  80                  */
  81                 sub22(1,0xc3);
  82                 sub22(0,0xa0);
  83                 spin_unlock_irqrestore(&ide_lock, flags);
  84         } else {
  85                 /* we don't know how to set it back again.. */
  86         }
  87
  88         /*
  89          * 32bit I/O has to be enabled for *both* drives at the same time.
  90          */
  91         drive->io_32bit = 1;
  92         HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
  93 }
  94
  95 static int __init dtc2278_probe(void)
  96 {
  97         unsigned long flags;
  98         ide_hwif_t *hwif, *mate;
  99
 100         hwif = &ide_hwifs[0];
 101         mate = &ide_hwifs[1];
 102
 103         if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
 104                 return 1;
 105
 106         local_irq_save(flags);
 107         /*
 108          * This enables the second interface
 109          */
 110         outb_p(4,0xb0);
 111         inb(0x3f6);
 112         outb_p(0x20,0xb4);
 113         inb(0x3f6);
 114 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
 115         /*
 116          * This enables PIO mode4 (3?) on the first interface
 117          * and may solve start-up problems for some people.
 118          */
 119         sub22(1,0xc3);
 120         sub22(0,0xa0);
 121 #endif
 122         local_irq_restore(flags);
 123
 124         hwif->serialized = 1;
 125         hwif->chipset = ide_dtc2278;
 126         hwif->tuneproc = &tune_dtc2278;
 127         hwif->drives[0].no_unmask = 1;
 128         hwif->drives[1].no_unmask = 1;
 129         hwif->mate = mate;
 130
 131         mate->serialized = 1;
 132         mate->chipset = ide_dtc2278;
 133         mate->drives[0].no_unmask = 1;
 134         mate->drives[1].no_unmask = 1;
 135         mate->mate = hwif;
 136         mate->channel = 1;
 137
 138         probe_hwif_init(hwif);
 139         probe_hwif_init(mate);
 140
 141         create_proc_ide_interfaces();
 142
 143         return 0;
 144 }
 145
 146 int probe_dtc2278 = 0;
 147
 148 module_param_named(probe, probe_dtc2278, bool, 0);
 149 MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
 150
 151 /* Can be called directly from ide.c. */
 152 int __init dtc2278_init(void)
 153 {
 154         if (probe_dtc2278 == 0)
 155                 return -ENODEV;
 156
 157         if (dtc2278_probe()) {
 158                 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
 159                 return -EBUSY;
 160         }
 161         return 0;
 162 }
 163
 164 #ifdef MODULE
 165 module_init(dtc2278_init);
 166 #endif
 167
 168 MODULE_AUTHOR("See Local File");
 169 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
 170 MODULE_LICENSE("GPL");