drivers/ide/legacy/dtc2278.c

   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/hdreg.h>
  14 #include <linux/ide.h>
  15 #include <linux/init.h>
  16
  17 #include <asm/io.h>
  18
  19 /*
  20  * Changing this #undef to #define may solve start up problems in some systems.
  21  */
  22 #undef ALWAYS_SET_DTC2278_PIO_MODE
  23
  24 /*
  25  * From: andy@cercle.cts.com (Dyan Wile)
  26  *
  27  * Below is a patch for DTC-2278 - alike software-programmable controllers
  28  * The code enables the secondary IDE controller and the PIO4 (3?) timings on
  29  * the primary (EIDE). You may probably have to enable the 32-bit support to
  30  * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
  31  * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
  32  * filesystem  corrupted with -u1, but under heavy disk load only :-)
  33  *
  34  * This card is now forced to use the "serialize" feature,
  35  * and irq-unmasking is disallowed.  If io_32bit is enabled,
  36  * it must be done for BOTH drives on each interface.
  37  *
  38  * This code was written for the DTC2278E, but might work with any of these:
  39  *
  40  * DTC2278S has only a single IDE interface.
  41  * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
  42  * DTC2278E also has serial ports and a printer port
  43  * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
  44  *
  45  * There may be a fourth controller type. The S and D versions use the
  46  * Winbond chip, and I think the E version does also.
  47  *
  48  */
  49
  50 static void sub22 (char b, char c)
  51 {
  52         int i;
  53
  54         for(i = 0; i < 3; ++i) {
  55                 inb(0x3f6);
  56                 outb_p(b,0xb0);
  57                 inb(0x3f6);
  58                 outb_p(c,0xb4);
  59                 inb(0x3f6);
  60                 if(inb(0xb4) == c) {
  61                         outb_p(7,0xb0);
  62                         inb(0x3f6);
  63                         return; /* success */
  64                 }
  65         }
  66 }
  67
  68 static DEFINE_SPINLOCK(dtc2278_lock);
  69
  70 static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio)
  71 {
  72         unsigned long flags;
  73
  74         if (pio >= 3) {
  75                 spin_lock_irqsave(&dtc2278_lock, flags);
  76                 /*
  77                  * This enables PIO mode4 (3?) on the first interface
  78                  */
  79                 sub22(1,0xc3);
  80                 sub22(0,0xa0);
  81                 spin_unlock_irqrestore(&dtc2278_lock, flags);
  82         } else {
  83                 /* we don't know how to set it back again.. */
  84                 /* Actually we do - there is a data sheet available for the
  85                    Winbond but does anyone actually care */
  86         }
  87 }
  88
  89 static const struct ide_port_info dtc2278_port_info __initdata = {
  90         .chipset                = ide_dtc2278,
  91         .host_flags             = IDE_HFLAG_SERIALIZE |
  92                                   IDE_HFLAG_NO_UNMASK_IRQS |
  93                                   IDE_HFLAG_IO_32BIT |
  94                                   /* disallow ->io_32bit changes */
  95                                   IDE_HFLAG_NO_IO_32BIT |
  96                                   IDE_HFLAG_NO_DMA |
  97                                   IDE_HFLAG_NO_AUTOTUNE,
  98         .pio_mask               = ATA_PIO4,
  99 };
 100
 101 static int __init dtc2278_probe(void)
 102 {
 103         unsigned long flags;
 104         ide_hwif_t *hwif, *mate;
 105         static u8 idx[4] = { 0, 1, 0xff, 0xff };
 106
 107         hwif = &ide_hwifs[0];
 108         mate = &ide_hwifs[1];
 109
 110         if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
 111                 return 1;
 112
 113         local_irq_save(flags);
 114         /*
 115          * This enables the second interface
 116          */
 117         outb_p(4,0xb0);
 118         inb(0x3f6);
 119         outb_p(0x20,0xb4);
 120         inb(0x3f6);
 121 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
 122         /*
 123          * This enables PIO mode4 (3?) on the first interface
 124          * and may solve start-up problems for some people.
 125          */
 126         sub22(1,0xc3);
 127         sub22(0,0xa0);
 128 #endif
 129         local_irq_restore(flags);
 130
 131         hwif->set_pio_mode = &dtc2278_set_pio_mode;
 132
 133         ide_device_add(idx, &dtc2278_port_info);
 134
 135         return 0;
 136 }
 137
 138 int probe_dtc2278 = 0;
 139
 140 module_param_named(probe, probe_dtc2278, bool, 0);
 141 MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
 142
 143 static int __init dtc2278_init(void)
 144 {
 145         if (probe_dtc2278 == 0)
 146                 return -ENODEV;
 147
 148         if (dtc2278_probe()) {
 149                 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
 150                 return -EBUSY;
 151         }
 152         return 0;
 153 }
 154
 155 module_init(dtc2278_init);
 156
 157 MODULE_AUTHOR("See Local File");
 158 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
 159 MODULE_LICENSE("GPL");