drivers/ata/pata_opti.c

   1 /*
   2  * pata_opti.c  - ATI PATA for new ATA layer
   3  *                        (C) 2005 Red Hat Inc
   4  *                        Alan Cox <alan@redhat.com>
   5  *
   6  * Based on
   7  *  linux/drivers/ide/pci/opti621.c             Version 0.7     Sept 10, 2002
   8  *
   9  *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
  10  *
  11  * Authors:
  12  * Jaromir Koutek <miri@punknet.cz>,
  13  * Jan Harkes <jaharkes@cwi.nl>,
  14  * Mark Lord <mlord@pobox.com>
  15  * Some parts of code are from ali14xx.c and from rz1000.c.
  16  *
  17  * Also consulted the FreeBSD prototype driver by Kevin Day to try
  18  * and resolve some confusions. Further documentation can be found in
  19  * Ralf Brown's interrupt list
  20  *
  21  * If you have other variants of the Opti range (Viper/Vendetta) please
  22  * try this driver with those PCI idents and report back. For the later
  23  * chips see the pata_optidma driver
  24  *
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/pci.h>
  30 #include <linux/init.h>
  31 #include <linux/blkdev.h>
  32 #include <linux/delay.h>
  33 #include <scsi/scsi_host.h>
  34 #include <linux/libata.h>
  35
  36 #define DRV_NAME "pata_opti"
  37 #define DRV_VERSION "0.2.9"
  38
  39 enum {
  40         READ_REG        = 0,    /* index of Read cycle timing register */
  41         WRITE_REG       = 1,    /* index of Write cycle timing register */
  42         CNTRL_REG       = 3,    /* index of Control register */
  43         STRAP_REG       = 5,    /* index of Strap register */
  44         MISC_REG        = 6     /* index of Miscellaneous register */
  45 };
  46
  47 /**
  48  *      opti_pre_reset          -       probe begin
  49  *      @link: ATA link
  50  *      @deadline: deadline jiffies for the operation
  51  *
  52  *      Set up cable type and use generic probe init
  53  */
  54
  55 static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
  56 {
  57         struct ata_port *ap = link->ap;
  58         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  59         static const struct pci_bits opti_enable_bits[] = {
  60                 { 0x45, 1, 0x80, 0x00 },
  61                 { 0x40, 1, 0x08, 0x00 }
  62         };
  63
  64         if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
  65                 return -ENOENT;
  66
  67         return ata_sff_prereset(link, deadline);
  68 }
  69
  70 /**
  71  *      opti_write_reg          -       control register setup
  72  *      @ap: ATA port
  73  *      @value: value
  74  *      @reg: control register number
  75  *
  76  *      The Opti uses magic 'trapdoor' register accesses to do configuration
  77  *      rather than using PCI space as other controllers do. The double inw
  78  *      on the error register activates configuration mode. We can then write
  79  *      the control register
  80  */
  81
  82 static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
  83 {
  84         void __iomem *regio = ap->ioaddr.cmd_addr;
  85
  86         /* These 3 unlock the control register access */
  87         ioread16(regio + 1);
  88         ioread16(regio + 1);
  89         iowrite8(3, regio + 2);
  90
  91         /* Do the I/O */
  92         iowrite8(val, regio + reg);
  93
  94         /* Relock */
  95         iowrite8(0x83, regio + 2);
  96 }
  97
  98 /**
  99  *      opti_set_piomode        -       set initial PIO mode data
 100  *      @ap: ATA interface
 101  *      @adev: ATA device
 102  *
 103  *      Called to do the PIO mode setup. Timing numbers are taken from
 104  *      the FreeBSD driver then pre computed to keep the code clean. There
 105  *      are two tables depending on the hardware clock speed.
 106  */
 107
 108 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
 109 {
 110         struct ata_device *pair = ata_dev_pair(adev);
 111         int clock;
 112         int pio = adev->pio_mode - XFER_PIO_0;
 113         void __iomem *regio = ap->ioaddr.cmd_addr;
 114         u8 addr;
 115
 116         /* Address table precomputed with prefetch off and a DCLK of 2 */
 117         static const u8 addr_timing[2][5] = {
 118                 { 0x30, 0x20, 0x20, 0x10, 0x10 },
 119                 { 0x20, 0x20, 0x10, 0x10, 0x10 }
 120         };
 121         static const u8 data_rec_timing[2][5] = {
 122                 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
 123                 { 0x58, 0x44, 0x32, 0x22, 0x21 }
 124         };
 125
 126         iowrite8(0xff, regio + 5);
 127         clock = ioread16(regio + 5) & 1;
 128
 129         /*
 130          *      As with many controllers the address setup time is shared
 131          *      and must suit both devices if present.
 132          */
 133
 134         addr = addr_timing[clock][pio];
 135         if (pair) {
 136                 /* Hardware constraint */
 137                 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
 138                 if (pair_addr > addr)
 139                         addr = pair_addr;
 140         }
 141
 142         /* Commence primary programming sequence */
 143         opti_write_reg(ap, adev->devno, MISC_REG);
 144         opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
 145         opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
 146         opti_write_reg(ap, addr, MISC_REG);
 147
 148         /* Programming sequence complete, override strapping */
 149         opti_write_reg(ap, 0x85, CNTRL_REG);
 150 }
 151
 152 static struct scsi_host_template opti_sht = {
 153         ATA_PIO_SHT(DRV_NAME),
 154 };
 155
 156 static struct ata_port_operations opti_port_ops = {
 157         .inherits       = &ata_sff_port_ops,
 158         .cable_detect   = ata_cable_40wire,
 159         .set_piomode    = opti_set_piomode,
 160         .prereset       = opti_pre_reset,
 161 };
 162
 163 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 164 {
 165         static const struct ata_port_info info = {
 166                 .flags = ATA_FLAG_SLAVE_POSS,
 167                 .pio_mask = 0x1f,
 168                 .port_ops = &opti_port_ops
 169         };
 170         const struct ata_port_info *ppi[] = { &info, NULL };
 171         static int printed_version;
 172
 173         if (!printed_version++)
 174                 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
 175
 176         return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL);
 177 }
 178
 179 static const struct pci_device_id opti[] = {
 180         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
 181         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
 182
 183         { },
 184 };
 185
 186 static struct pci_driver opti_pci_driver = {
 187         .name           = DRV_NAME,
 188         .id_table       = opti,
 189         .probe          = opti_init_one,
 190         .remove         = ata_pci_remove_one,
 191 #ifdef CONFIG_PM
 192         .suspend        = ata_pci_device_suspend,
 193         .resume         = ata_pci_device_resume,
 194 #endif
 195 };
 196
 197 static int __init opti_init(void)
 198 {
 199         return pci_register_driver(&opti_pci_driver);
 200 }
 201
 202 static void __exit opti_exit(void)
 203 {
 204         pci_unregister_driver(&opti_pci_driver);
 205 }
 206
 207
 208 MODULE_AUTHOR("Alan Cox");
 209 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
 210 MODULE_LICENSE("GPL");
 211 MODULE_DEVICE_TABLE(pci, opti);
 212 MODULE_VERSION(DRV_VERSION);
 213
 214 module_init(opti_init);
 215 module_exit(opti_exit);