drivers/ide/dtc2278.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 1996  Linus Torvalds & author (see below)
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/types.h>
   8 #include <linux/kernel.h>
   9 #include <linux/delay.h>
  10 #include <linux/timer.h>
  11 #include <linux/mm.h>
  12 #include <linux/ioport.h>
  13 #include <linux/blkdev.h>
  14 #include <linux/ide.h>
  15 #include <linux/init.h>
  16
  17 #include <asm/io.h>
  18
  19 #define DRV_NAME "dtc2278"
  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 DEFINE_SPINLOCK(dtc2278_lock);
  71
  72 static void dtc2278_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  73 {
  74         unsigned long flags;
  75
  76         if (drive->pio_mode >= XFER_PIO_3) {
  77                 spin_lock_irqsave(&dtc2278_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(&dtc2278_lock, flags);
  84         } else {
  85                 /* we don't know how to set it back again.. */
  86                 /* Actually we do - there is a data sheet available for the
  87                    Winbond but does anyone actually care */
  88         }
  89 }
  90
  91 static const struct ide_port_ops dtc2278_port_ops = {
  92         .set_pio_mode           = dtc2278_set_pio_mode,
  93 };
  94
  95 static const struct ide_port_info dtc2278_port_info __initconst = {
  96         .name                   = DRV_NAME,
  97         .chipset                = ide_dtc2278,
  98         .port_ops               = &dtc2278_port_ops,
  99         .host_flags             = IDE_HFLAG_SERIALIZE |
 100                                   IDE_HFLAG_NO_UNMASK_IRQS |
 101                                   IDE_HFLAG_IO_32BIT |
 102                                   /* disallow ->io_32bit changes */
 103                                   IDE_HFLAG_NO_IO_32BIT |
 104                                   IDE_HFLAG_NO_DMA |
 105                                   IDE_HFLAG_DTC2278,
 106         .pio_mask               = ATA_PIO4,
 107 };
 108
 109 static int __init dtc2278_probe(void)
 110 {
 111         unsigned long flags;
 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         return ide_legacy_device_add(&dtc2278_port_info, 0);
 132 }
 133
 134 static bool probe_dtc2278;
 135
 136 module_param_named(probe, probe_dtc2278, bool, 0);
 137 MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
 138
 139 static int __init dtc2278_init(void)
 140 {
 141         if (probe_dtc2278 == 0)
 142                 return -ENODEV;
 143
 144         if (dtc2278_probe()) {
 145                 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
 146                 return -EBUSY;
 147         }
 148         return 0;
 149 }
 150
 151 module_init(dtc2278_init);
 152
 153 MODULE_AUTHOR("See Local File");
 154 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
 155 MODULE_LICENSE("GPL");