drivers/ata/pata_opti.c

   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
  37 enum {
  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
  53 static 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
  80 static 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
 106 static 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
 150 static struct scsi_host_template opti_sht = {
 151         ATA_PIO_SHT(DRV_NAME),
 152 };
 153
 154 static 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
 161 static 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
 175 static 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
 182 static 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
 193 module_pci_driver(opti_pci_driver);
 194
 195 MODULE_AUTHOR("Alan Cox");
 196 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
 197 MODULE_LICENSE("GPL");
 198 MODULE_DEVICE_TABLE(pci, opti);
 199 MODULE_VERSION(DRV_VERSION);