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 "0.2.8"
  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  *      @ap: ATA port
  50  *
  51  *      Set up cable type and use generic probe init
  52  */
  53
  54 static int opti_pre_reset(struct ata_port *ap)
  55 {
  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         ap->cbl = ATA_CBL_PATA40;
  66         return ata_std_prereset(ap);
  67 }
  68
  69 /**
  70  *      opti_probe_reset                -       probe reset
  71  *      @ap: ATA port
  72  *
  73  *      Perform the ATA probe and bus reset sequence plus specific handling
  74  *      for this hardware. The Opti needs little handling - we have no UDMA66
  75  *      capability that needs cable detection. All we must do is check the port
  76  *      is enabled.
  77  */
  78
  79 static void opti_error_handler(struct ata_port *ap)
  80 {
  81         ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
  82 }
  83
  84 /**
  85  *      opti_write_reg          -       control register setup
  86  *      @ap: ATA port
  87  *      @value: value
  88  *      @reg: control register number
  89  *
  90  *      The Opti uses magic 'trapdoor' register accesses to do configuration
  91  *      rather than using PCI space as other controllers do. The double inw
  92  *      on the error register activates configuration mode. We can then write
  93  *      the control register
  94  */
  95
  96 static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
  97 {
  98         void __iomem *regio = ap->ioaddr.cmd_addr;
  99
 100         /* These 3 unlock the control register access */
 101         ioread16(regio + 1);
 102         ioread16(regio + 1);
 103         iowrite8(3, regio + 2);
 104
 105         /* Do the I/O */
 106         iowrite8(val, regio + reg);
 107
 108         /* Relock */
 109         iowrite8(0x83, regio + 2);
 110 }
 111
 112 /**
 113  *      opti_set_piomode        -       set initial PIO mode data
 114  *      @ap: ATA interface
 115  *      @adev: ATA device
 116  *
 117  *      Called to do the PIO mode setup. Timing numbers are taken from
 118  *      the FreeBSD driver then pre computed to keep the code clean. There
 119  *      are two tables depending on the hardware clock speed.
 120  */
 121
 122 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
 123 {
 124         struct ata_device *pair = ata_dev_pair(adev);
 125         int clock;
 126         int pio = adev->pio_mode - XFER_PIO_0;
 127         void __iomem *regio = ap->ioaddr.cmd_addr;
 128         u8 addr;
 129
 130         /* Address table precomputed with prefetch off and a DCLK of 2 */
 131         static const u8 addr_timing[2][5] = {
 132                 { 0x30, 0x20, 0x20, 0x10, 0x10 },
 133                 { 0x20, 0x20, 0x10, 0x10, 0x10 }
 134         };
 135         static const u8 data_rec_timing[2][5] = {
 136                 { 0x6B, 0x56, 0x42, 0x32, 0x31 },
 137                 { 0x58, 0x44, 0x32, 0x22, 0x21 }
 138         };
 139
 140         iowrite8(0xff, regio + 5);
 141         clock = ioread16(regio + 5) & 1;
 142
 143         /*
 144          *      As with many controllers the address setup time is shared
 145          *      and must suit both devices if present.
 146          */
 147
 148         addr = addr_timing[clock][pio];
 149         if (pair) {
 150                 /* Hardware constraint */
 151                 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
 152                 if (pair_addr > addr)
 153                         addr = pair_addr;
 154         }
 155
 156         /* Commence primary programming sequence */
 157         opti_write_reg(ap, adev->devno, MISC_REG);
 158         opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
 159         opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
 160         opti_write_reg(ap, addr, MISC_REG);
 161
 162         /* Programming sequence complete, override strapping */
 163         opti_write_reg(ap, 0x85, CNTRL_REG);
 164 }
 165
 166 static struct scsi_host_template opti_sht = {
 167         .module                 = THIS_MODULE,
 168         .name                   = DRV_NAME,
 169         .ioctl                  = ata_scsi_ioctl,
 170         .queuecommand           = ata_scsi_queuecmd,
 171         .can_queue              = ATA_DEF_QUEUE,
 172         .this_id                = ATA_SHT_THIS_ID,
 173         .sg_tablesize           = LIBATA_MAX_PRD,
 174         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 175         .emulated               = ATA_SHT_EMULATED,
 176         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 177         .proc_name              = DRV_NAME,
 178         .dma_boundary           = ATA_DMA_BOUNDARY,
 179         .slave_configure        = ata_scsi_slave_config,
 180         .slave_destroy          = ata_scsi_slave_destroy,
 181         .bios_param             = ata_std_bios_param,
 182         .resume                 = ata_scsi_device_resume,
 183         .suspend                = ata_scsi_device_suspend,
 184 };
 185
 186 static struct ata_port_operations opti_port_ops = {
 187         .port_disable   = ata_port_disable,
 188         .set_piomode    = opti_set_piomode,
 189         .tf_load        = ata_tf_load,
 190         .tf_read        = ata_tf_read,
 191         .check_status   = ata_check_status,
 192         .exec_command   = ata_exec_command,
 193         .dev_select     = ata_std_dev_select,
 194
 195         .freeze         = ata_bmdma_freeze,
 196         .thaw           = ata_bmdma_thaw,
 197         .error_handler  = opti_error_handler,
 198         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 199
 200         .bmdma_setup    = ata_bmdma_setup,
 201         .bmdma_start    = ata_bmdma_start,
 202         .bmdma_stop     = ata_bmdma_stop,
 203         .bmdma_status   = ata_bmdma_status,
 204
 205         .qc_prep        = ata_qc_prep,
 206         .qc_issue       = ata_qc_issue_prot,
 207
 208         .data_xfer      = ata_data_xfer,
 209
 210         .irq_handler    = ata_interrupt,
 211         .irq_clear      = ata_bmdma_irq_clear,
 212         .irq_on         = ata_irq_on,
 213         .irq_ack        = ata_irq_ack,
 214
 215         .port_start     = ata_port_start,
 216 };
 217
 218 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 219 {
 220         static struct ata_port_info info = {
 221                 .sht = &opti_sht,
 222                 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 223                 .pio_mask = 0x1f,
 224                 .port_ops = &opti_port_ops
 225         };
 226         static struct ata_port_info *port_info[2] = { &info, &info };
 227         static int printed_version;
 228
 229         if (!printed_version++)
 230                 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
 231
 232         return ata_pci_init_one(dev, port_info, 2);
 233 }
 234
 235 static const struct pci_device_id opti[] = {
 236         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
 237         { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
 238
 239         { },
 240 };
 241
 242 static struct pci_driver opti_pci_driver = {
 243         .name           = DRV_NAME,
 244         .id_table       = opti,
 245         .probe          = opti_init_one,
 246         .remove         = ata_pci_remove_one,
 247         .suspend        = ata_pci_device_suspend,
 248         .resume         = ata_pci_device_resume,
 249 };
 250
 251 static int __init opti_init(void)
 252 {
 253         return pci_register_driver(&opti_pci_driver);
 254 }
 255
 256 static void __exit opti_exit(void)
 257 {
 258         pci_unregister_driver(&opti_pci_driver);
 259 }
 260
 261
 262 MODULE_AUTHOR("Alan Cox");
 263 MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
 264 MODULE_LICENSE("GPL");
 265 MODULE_DEVICE_TABLE(pci, opti);
 266 MODULE_VERSION(DRV_VERSION);
 267
 268 module_init(opti_init);
 269 module_exit(opti_exit);