LXR linux/drivers/ata/pata

   1/*
   2 * pata_opti.c  - ATI PATA for new ATA layer
   3 *                        (C) 2005 Red Hat Inc
   4 *
   5 * Based on
   6 *  linux/drivers/ide/pci/opti621.c             Version 0.7     Sept 10, 2002
   7 *
   8 *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
   9 *
  10 * Authors:
  11 * Jaromir Koutek <miri@punknet.cz>,
  12 * Jan Harkes <jaharkes@cwi.nl>,
  13 * Mark Lord <mlord@pobox.com>
  14 * Some parts of code are from ali14xx.c and from rz1000.c.
  15 *
  16 * Also consulted the FreeBSD prototype driver by Kevin Day to try
  17 * and resolve some confusions. Further documentation can be found in
  18 * Ralf Brown's interrupt list
  19 *
  20 * If you have other variants of the Opti range (Viper/Vendetta) please
  21 * try this driver with those PCI idents and report back. For the later
  22 * chips see the pata_optidma driver
  23 *
  24 */
  25
  26#include <linux/kernel.h>
  27#include <linux/module.h>
  28#include <linux/pci.h>
  29#include <linux/blkdev.h>
  30#include <linux/delay.h>
  31#include <scsi/scsi_host.h>
  32#include <linux/libata.h>
  33
  34#define DRV_NAME "pata_opti"
  35#define DRV_VERSION "0.2.9"
  36
  37enum {
  38        READ_REG        = 0,    /* index of Read cycle timing register */
  39        WRITE_REG       = 1,    /* index of Write cycle timing register */
  40        CNTRL_REG       = 3,    /* index of Control register */
  41        STRAP_REG       = 5,    /* index of Strap register */
  42        MISC_REG        = 6     /* index of Miscellaneous register */
  43};
  44
  45/**
  46 *      opti_pre_reset          -       probe begin
  47 *      @link: ATA link
  48 *      @deadline: deadline jiffies for the operation
  49 *
  50 *      Set up cable type and use generic probe init
  51 */
  52
  53static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
  54{
  55        struct ata_port *ap = link->ap;
  56        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  57        static const struct pci_bits opti_enable_bits[] = {
  58                { 0x45, 1, 0x80, 0x00 },
  59                { 0x40, 1, 0x08, 0x00 }
  60        };
  61
  62        if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
  63                return -ENOENT;
  64
  65        return ata_sff_prereset(link, deadline);
  66}
  67
  68/**
  69 *      opti_write_reg          -       control register setup
  70 *      @ap: ATA port
  71 *      @value: value
  72 *      @reg: control register number
  73 *
  74 *      The Opti uses magic 'trapdoor' register accesses to do configuration
  75 *      rather than using PCI space as other controllers do. The double inw
  76 *      on the error register activates configuration mode. We can then write
  77 *      the control register
  78 */
  79
  80static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
  81{
  82        void __iomem *regio = ap->ioaddr.cmd_addr;
  83
  84        /* These 3 unlock the control register access */
  85        ioread16(regio + 1);
  86        ioread16(regio + 1);
  87        iowrite8(3, regio + 2);
  88
  89        /* Do the I/O */
  90        iowrite8(val, regio + reg);
  91
  92        /* Relock */
  93        iowrite8(0x83, regio + 2);
  94}
  95
  96/**
  97 *      opti_set_piomode        -       set initial PIO mode data
  98 *      @ap: ATA interface
  99 *      @adev: ATA device
 100 *
 101 *      Called to do the PIO mode setup. Timing numbers are taken from
 102 *      the FreeBSD driver then pre computed to keep the code clean. There
 103 *      are two tables depending on the hardware clock speed.
 104 */
 105
 106static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
 107{
 108        struct ata_device *pair = ata_dev_pair(adev);
 109        int clock;
 110        int pio = adev->pio_mode - XFER_PIO_0;
 111        void __iomem *regio = ap->ioaddr.cmd_addr;
 112        u8 addr;
 113
 114        /* Address table precomputed with prefetch off and a DCLK of 2 */
 115        static const u8 addr_timing[2][5] = {
 116                { 0x30, 0x20, 0x20, 0x10, 0x10 },
 117                { 0x20, 0x20, 0x10, 0x10, 0x10 }
 118        };
 119        static const u8 data_rec_timing[2][5] = {
 120                { 0x6B, 0x56, 0x42, 0x32, 0x31 },
 121                { 0x58, 0x44, 0x32, 0x22, 0x21 }
 122        };
 123
 124        iowrite8(0xff, regio + 5);
 125        clock = ioread16(regio + 5) & 1;
 126
 127        /*
 128         *      As with many controllers the address setup time is shared
 129         *      and must suit both devices if present.
 130         */
 131
 132        addr = addr_timing[clock][pio];
 133        if (pair) {
 134                /* Hardware constraint */
 135                u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
 136                if (pair_addr > addr)
 137                        addr = pair_addr;
 138        }
 139
 140        /* Commence primary programming sequence */
 141        opti_write_reg(ap, adev->devno, MISC_REG);
 142        opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
 143        opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
 144        opti_write_reg(ap, addr, MISC_REG);
 145
 146        /* Programming sequence complete, override strapping */
 147        opti_write_reg(ap, 0x85, CNTRL_REG);
 148}
 149
 150static struct scsi_host_template opti_sht = {
 151        ATA_PIO_SHT(DRV_NAME),
 152};
 153
 154static struct ata_port_operations opti_port_ops = {
 155        .inherits       = &ata_sff_port_ops,
 156        .cable_detect   = ata_cable_40wire,
 157        .set_piomode    = opti_set_piomode,
 158        .prereset       = opti_pre_reset,
 159};
 160
 161static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 162{
 163        static const struct ata_port_info info = {
 164                .flags = ATA_FLAG_SLAVE_POSS,
 165                .pio_mask = ATA_PIO4,
 166                .port_ops = &opti_port_ops
 167        };
 168        const struct ata_port_info *ppi[] = { &info, NULL };
 169
 170        ata_print_version_once(&dev->dev, DRV_VERSION);
 171
 172        return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL, 0);
 173}
 174
 175static const struct pci_device_id opti[] = {
 176        { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
 177        { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
 178
 179        { },
 180};
 181
 182static struct pci_driver opti_pci_driver = {
 183        .name           = DRV_NAME,
 184        .id_table       = opti,
 185        .probe          = opti_init_one,
 186        .remove         = ata_pci_remove_one,
 187#ifdef CONFIG_PM_SLEEP
 188        .suspend        = ata_pci_device_suspend,
 189        .resume         = ata_pci_device_resume,
 190#endif
 191};
 192
 193module_pci_driver(opti_pci_driver);
 194
 195MODULE_AUTHOR("Alan Cox");
 196MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
 197MODULE_LICENSE("GPL");
 198MODULE_DEVICE_TABLE(pci, opti);
 199MODULE_VERSION(DRV_VERSION);
 200