drivers/ide/opti621.c

   1 /*
   2  *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
   3  */
   4
   5 /*
   6  * Authors:
   7  * Jaromir Koutek <miri@punknet.cz>,
   8  * Jan Harkes <jaharkes@cwi.nl>,
   9  * Mark Lord <mlord@pobox.com>
  10  * Some parts of code are from ali14xx.c and from rz1000.c.
  11  */
  12
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/pci.h>
  17 #include <linux/ide.h>
  18
  19 #include <asm/io.h>
  20
  21 #define DRV_NAME "opti621"
  22
  23 #define READ_REG 0      /* index of Read cycle timing register */
  24 #define WRITE_REG 1     /* index of Write cycle timing register */
  25 #define CNTRL_REG 3     /* index of Control register */
  26 #define STRAP_REG 5     /* index of Strap register */
  27 #define MISC_REG 6      /* index of Miscellaneous register */
  28
  29 static int reg_base;
  30
  31 static DEFINE_SPINLOCK(opti621_lock);
  32
  33 /* Write value to register reg, base of register
  34  * is at reg_base (0x1f0 primary, 0x170 secondary,
  35  * if not changed by PCI configuration).
  36  * This is from setupvic.exe program.
  37  */
  38 static void write_reg(u8 value, int reg)
  39 {
  40         inw(reg_base + 1);
  41         inw(reg_base + 1);
  42         outb(3, reg_base + 2);
  43         outb(value, reg_base + reg);
  44         outb(0x83, reg_base + 2);
  45 }
  46
  47 /* Read value from register reg, base of register
  48  * is at reg_base (0x1f0 primary, 0x170 secondary,
  49  * if not changed by PCI configuration).
  50  * This is from setupvic.exe program.
  51  */
  52 static u8 read_reg(int reg)
  53 {
  54         u8 ret = 0;
  55
  56         inw(reg_base + 1);
  57         inw(reg_base + 1);
  58         outb(3, reg_base + 2);
  59         ret = inb(reg_base + reg);
  60         outb(0x83, reg_base + 2);
  61
  62         return ret;
  63 }
  64
  65 static void opti621_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  66 {
  67         ide_drive_t *pair = ide_get_pair_dev(drive);
  68         unsigned long flags;
  69         unsigned long mode = drive->pio_mode, pair_mode;
  70         const u8 pio = mode - XFER_PIO_0;
  71         u8 tim, misc, addr_pio = pio, clk;
  72
  73         /* DRDY is default 2 (by OPTi Databook) */
  74         static const u8 addr_timings[2][5] = {
  75                 { 0x20, 0x10, 0x00, 0x00, 0x00 },       /* 33 MHz */
  76                 { 0x10, 0x10, 0x00, 0x00, 0x00 },       /* 25 MHz */
  77         };
  78         static const u8 data_rec_timings[2][5] = {
  79                 { 0x5b, 0x45, 0x32, 0x21, 0x20 },       /* 33 MHz */
  80                 { 0x48, 0x34, 0x21, 0x10, 0x10 }        /* 25 MHz */
  81         };
  82
  83         ide_set_drivedata(drive, (void *)mode);
  84
  85         if (pair) {
  86                 pair_mode = (unsigned long)ide_get_drivedata(pair);
  87                 if (pair_mode && pair_mode < mode)
  88                         addr_pio = pair_mode - XFER_PIO_0;
  89         }
  90
  91         spin_lock_irqsave(&opti621_lock, flags);
  92
  93         reg_base = hwif->io_ports.data_addr;
  94
  95         /* allow Register-B */
  96         outb(0xc0, reg_base + CNTRL_REG);
  97         /* hmm, setupvic.exe does this ;-) */
  98         outb(0xff, reg_base + 5);
  99         /* if reads 0xff, adapter not exist? */
 100         (void)inb(reg_base + CNTRL_REG);
 101         /* if reads 0xc0, no interface exist? */
 102         read_reg(CNTRL_REG);
 103
 104         /* check CLK speed */
 105         clk = read_reg(STRAP_REG) & 1;
 106
 107         printk(KERN_INFO "%s: CLK = %d MHz\n", hwif->name, clk ? 25 : 33);
 108
 109         tim  = data_rec_timings[clk][pio];
 110         misc = addr_timings[clk][addr_pio];
 111
 112         /* select Index-0/1 for Register-A/B */
 113         write_reg(drive->dn & 1, MISC_REG);
 114         /* set read cycle timings */
 115         write_reg(tim, READ_REG);
 116         /* set write cycle timings */
 117         write_reg(tim, WRITE_REG);
 118
 119         /* use Register-A for drive 0 */
 120         /* use Register-B for drive 1 */
 121         write_reg(0x85, CNTRL_REG);
 122
 123         /* set address setup, DRDY timings,   */
 124         /*  and read prefetch for both drives */
 125         write_reg(misc, MISC_REG);
 126
 127         spin_unlock_irqrestore(&opti621_lock, flags);
 128 }
 129
 130 static const struct ide_port_ops opti621_port_ops = {
 131         .set_pio_mode           = opti621_set_pio_mode,
 132 };
 133
 134 static const struct ide_port_info opti621_chipset = {
 135         .name           = DRV_NAME,
 136         .enablebits     = { {0x45, 0x80, 0x00}, {0x40, 0x08, 0x00} },
 137         .port_ops       = &opti621_port_ops,
 138         .host_flags     = IDE_HFLAG_NO_DMA,
 139         .pio_mask       = ATA_PIO4,
 140 };
 141
 142 static int opti621_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 143 {
 144         return ide_pci_init_one(dev, &opti621_chipset, NULL);
 145 }
 146
 147 static const struct pci_device_id opti621_pci_tbl[] = {
 148         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
 149         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 0 },
 150         { 0, },
 151 };
 152 MODULE_DEVICE_TABLE(pci, opti621_pci_tbl);
 153
 154 static struct pci_driver opti621_pci_driver = {
 155         .name           = "Opti621_IDE",
 156         .id_table       = opti621_pci_tbl,
 157         .probe          = opti621_init_one,
 158         .remove         = ide_pci_remove,
 159         .suspend        = ide_pci_suspend,
 160         .resume         = ide_pci_resume,
 161 };
 162
 163 static int __init opti621_ide_init(void)
 164 {
 165         return ide_pci_register_driver(&opti621_pci_driver);
 166 }
 167
 168 static void __exit opti621_ide_exit(void)
 169 {
 170         pci_unregister_driver(&opti621_pci_driver);
 171 }
 172
 173 module_init(opti621_ide_init);
 174 module_exit(opti621_ide_exit);
 175
 176 MODULE_AUTHOR("Jaromir Koutek, Jan Harkes, Mark Lord");
 177 MODULE_DESCRIPTION("PCI driver module for Opti621 IDE");
 178 MODULE_LICENSE("GPL");