root/drivers/ide/opti621.c

DEFINITIONS

1. write_reg
2. read_reg
3. opti621_set_pio_mode
4. opti621_init_one
5. opti621_ide_init
6. opti621_ide_exit

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
   4  */
   5 
   6 /*
   7  * Authors:
   8  * Jaromir Koutek <miri@punknet.cz>,
   9  * Jan Harkes <jaharkes@cwi.nl>,
  10  * Mark Lord <mlord@pobox.com>
  11  * Some parts of code are from ali14xx.c and from rz1000.c.
  12  */
  13 
  14 #include <linux/types.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/pci.h>
  18 #include <linux/ide.h>
  19 
  20 #include <asm/io.h>
  21 
  22 #define DRV_NAME "opti621"
  23 
  24 #define READ_REG 0      /* index of Read cycle timing register */
  25 #define WRITE_REG 1     /* index of Write cycle timing register */
  26 #define CNTRL_REG 3     /* index of Control register */
  27 #define STRAP_REG 5     /* index of Strap register */
  28 #define MISC_REG 6      /* index of Miscellaneous register */
  29 
  30 static int reg_base;
  31 
  32 static DEFINE_SPINLOCK(opti621_lock);
  33 
  34 /* Write value to register reg, base of register
  35  * is at reg_base (0x1f0 primary, 0x170 secondary,
  36  * if not changed by PCI configuration).
  37  * This is from setupvic.exe program.
  38  */
  39 static void write_reg(u8 value, int reg)
  40 {
  41         inw(reg_base + 1);
  42         inw(reg_base + 1);
  43         outb(3, reg_base + 2);
  44         outb(value, reg_base + reg);
  45         outb(0x83, reg_base + 2);
  46 }
  47 
  48 /* Read value from register reg, base of register
  49  * is at reg_base (0x1f0 primary, 0x170 secondary,
  50  * if not changed by PCI configuration).
  51  * This is from setupvic.exe program.
  52  */
  53 static u8 read_reg(int reg)
  54 {
  55         u8 ret = 0;
  56 
  57         inw(reg_base + 1);
  58         inw(reg_base + 1);
  59         outb(3, reg_base + 2);
  60         ret = inb(reg_base + reg);
  61         outb(0x83, reg_base + 2);
  62 
  63         return ret;
  64 }
  65 
  66 static void opti621_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  67 {
  68         ide_drive_t *pair = ide_get_pair_dev(drive);
  69         unsigned long flags;
  70         unsigned long mode = drive->pio_mode, pair_mode;
  71         const u8 pio = mode - XFER_PIO_0;
  72         u8 tim, misc, addr_pio = pio, clk;
  73 
  74         /* DRDY is default 2 (by OPTi Databook) */
  75         static const u8 addr_timings[2][5] = {
  76                 { 0x20, 0x10, 0x00, 0x00, 0x00 },       /* 33 MHz */
  77                 { 0x10, 0x10, 0x00, 0x00, 0x00 },       /* 25 MHz */
  78         };
  79         static const u8 data_rec_timings[2][5] = {
  80                 { 0x5b, 0x45, 0x32, 0x21, 0x20 },       /* 33 MHz */
  81                 { 0x48, 0x34, 0x21, 0x10, 0x10 }        /* 25 MHz */
  82         };
  83 
  84         ide_set_drivedata(drive, (void *)mode);
  85 
  86         if (pair) {
  87                 pair_mode = (unsigned long)ide_get_drivedata(pair);
  88                 if (pair_mode && pair_mode < mode)
  89                         addr_pio = pair_mode - XFER_PIO_0;
  90         }
  91 
  92         spin_lock_irqsave(&opti621_lock, flags);
  93 
  94         reg_base = hwif->io_ports.data_addr;
  95 
  96         /* allow Register-B */
  97         outb(0xc0, reg_base + CNTRL_REG);
  98         /* hmm, setupvic.exe does this ;-) */
  99         outb(0xff, reg_base + 5);
 100         /* if reads 0xff, adapter not exist? */
 101         (void)inb(reg_base + CNTRL_REG);
 102         /* if reads 0xc0, no interface exist? */
 103         read_reg(CNTRL_REG);
 104 
 105         /* check CLK speed */
 106         clk = read_reg(STRAP_REG) & 1;
 107 
 108         printk(KERN_INFO "%s: CLK = %d MHz\n", hwif->name, clk ? 25 : 33);
 109 
 110         tim  = data_rec_timings[clk][pio];
 111         misc = addr_timings[clk][addr_pio];
 112 
 113         /* select Index-0/1 for Register-A/B */
 114         write_reg(drive->dn & 1, MISC_REG);
 115         /* set read cycle timings */
 116         write_reg(tim, READ_REG);
 117         /* set write cycle timings */
 118         write_reg(tim, WRITE_REG);
 119 
 120         /* use Register-A for drive 0 */
 121         /* use Register-B for drive 1 */
 122         write_reg(0x85, CNTRL_REG);
 123 
 124         /* set address setup, DRDY timings,   */
 125         /*  and read prefetch for both drives */
 126         write_reg(misc, MISC_REG);
 127 
 128         spin_unlock_irqrestore(&opti621_lock, flags);
 129 }
 130 
 131 static const struct ide_port_ops opti621_port_ops = {
 132         .set_pio_mode           = opti621_set_pio_mode,
 133 };
 134 
 135 static const struct ide_port_info opti621_chipset = {
 136         .name           = DRV_NAME,
 137         .enablebits     = { {0x45, 0x80, 0x00}, {0x40, 0x08, 0x00} },
 138         .port_ops       = &opti621_port_ops,
 139         .host_flags     = IDE_HFLAG_NO_DMA,
 140         .pio_mask       = ATA_PIO4,
 141 };
 142 
 143 static int opti621_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 144 {
 145         return ide_pci_init_one(dev, &opti621_chipset, NULL);
 146 }
 147 
 148 static const struct pci_device_id opti621_pci_tbl[] = {
 149         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
 150         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 0 },
 151         { 0, },
 152 };
 153 MODULE_DEVICE_TABLE(pci, opti621_pci_tbl);
 154 
 155 static struct pci_driver opti621_pci_driver = {
 156         .name           = "Opti621_IDE",
 157         .id_table       = opti621_pci_tbl,
 158         .probe          = opti621_init_one,
 159         .remove         = ide_pci_remove,
 160         .suspend        = ide_pci_suspend,
 161         .resume         = ide_pci_resume,
 162 };
 163 
 164 static int __init opti621_ide_init(void)
 165 {
 166         return ide_pci_register_driver(&opti621_pci_driver);
 167 }
 168 
 169 static void __exit opti621_ide_exit(void)
 170 {
 171         pci_unregister_driver(&opti621_pci_driver);
 172 }
 173 
 174 module_init(opti621_ide_init);
 175 module_exit(opti621_ide_exit);
 176 
 177 MODULE_AUTHOR("Jaromir Koutek, Jan Harkes, Mark Lord");
 178 MODULE_DESCRIPTION("PCI driver module for Opti621 IDE");
 179 MODULE_LICENSE("GPL");