linux/drivers/ide/tc86c001.c
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   1/*
   2 * Copyright (C) 2002 Toshiba Corporation
   3 * Copyright (C) 2005-2006 MontaVista Software, Inc. <source@mvista.com>
   4 *
   5 * This file is licensed under the terms of the GNU General Public
   6 * License version 2.  This program is licensed "as is" without any
   7 * warranty of any kind, whether express or implied.
   8 */
   9
  10#include <linux/types.h>
  11#include <linux/pci.h>
  12#include <linux/ide.h>
  13#include <linux/module.h>
  14
  15#define DRV_NAME "tc86c001"
  16
  17static void tc86c001_set_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  18{
  19        unsigned long scr_port  = hwif->config_data + (drive->dn ? 0x02 : 0x00);
  20        u16 mode, scr           = inw(scr_port);
  21        const u8 speed          = drive->dma_mode;
  22
  23        switch (speed) {
  24        case XFER_UDMA_4:       mode = 0x00c0; break;
  25        case XFER_UDMA_3:       mode = 0x00b0; break;
  26        case XFER_UDMA_2:       mode = 0x00a0; break;
  27        case XFER_UDMA_1:       mode = 0x0090; break;
  28        case XFER_UDMA_0:       mode = 0x0080; break;
  29        case XFER_MW_DMA_2:     mode = 0x0070; break;
  30        case XFER_MW_DMA_1:     mode = 0x0060; break;
  31        case XFER_MW_DMA_0:     mode = 0x0050; break;
  32        case XFER_PIO_4:        mode = 0x0400; break;
  33        case XFER_PIO_3:        mode = 0x0300; break;
  34        case XFER_PIO_2:        mode = 0x0200; break;
  35        case XFER_PIO_1:        mode = 0x0100; break;
  36        case XFER_PIO_0:
  37        default:                mode = 0x0000; break;
  38        }
  39
  40        scr &= (speed < XFER_MW_DMA_0) ? 0xf8ff : 0xff0f;
  41        scr |= mode;
  42        outw(scr, scr_port);
  43}
  44
  45static void tc86c001_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  46{
  47        drive->dma_mode = drive->pio_mode;
  48        tc86c001_set_mode(hwif, drive);
  49}
  50
  51/*
  52 * HACKITY HACK
  53 *
  54 * This is a workaround for the limitation 5 of the TC86C001 IDE controller:
  55 * if a DMA transfer terminates prematurely, the controller leaves the device's
  56 * interrupt request (INTRQ) pending and does not generate a PCI interrupt (or
  57 * set the interrupt bit in the DMA status register), thus no PCI interrupt
  58 * will occur until a DMA transfer has been successfully completed.
  59 *
  60 * We work around this by initiating dummy, zero-length DMA transfer on
  61 * a DMA timeout expiration. I found no better way to do this with the current
  62 * IDE core than to temporarily replace a higher level driver's timer expiry
  63 * handler with our own backing up to that handler in case our recovery fails.
  64 */
  65static int tc86c001_timer_expiry(ide_drive_t *drive)
  66{
  67        ide_hwif_t *hwif        = drive->hwif;
  68        ide_expiry_t *expiry    = ide_get_hwifdata(hwif);
  69        u8 dma_stat             = inb(hwif->dma_base + ATA_DMA_STATUS);
  70
  71        /* Restore a higher level driver's expiry handler first. */
  72        hwif->expiry = expiry;
  73
  74        if ((dma_stat & 5) == 1) {      /* DMA active and no interrupt */
  75                unsigned long sc_base   = hwif->config_data;
  76                unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
  77                u8 dma_cmd              = inb(hwif->dma_base + ATA_DMA_CMD);
  78
  79                printk(KERN_WARNING "%s: DMA interrupt possibly stuck, "
  80                       "attempting recovery...\n", drive->name);
  81
  82                /* Stop DMA */
  83                outb(dma_cmd & ~0x01, hwif->dma_base + ATA_DMA_CMD);
  84
  85                /* Setup the dummy DMA transfer */
  86                outw(0, sc_base + 0x0a);        /* Sector Count */
  87                outw(0, twcr_port);     /* Transfer Word Count 1 or 2 */
  88
  89                /* Start the dummy DMA transfer */
  90
  91                /* clear R_OR_WCTR for write */
  92                outb(0x00, hwif->dma_base + ATA_DMA_CMD);
  93                /* set START_STOPBM */
  94                outb(0x01, hwif->dma_base + ATA_DMA_CMD);
  95
  96                /*
  97                 * If an interrupt was pending, it should come thru shortly.
  98                 * If not, a higher level driver's expiry handler should
  99                 * eventually cause some kind of recovery from the DMA stall.
 100                 */
 101                return WAIT_MIN_SLEEP;
 102        }
 103
 104        /* Chain to the restored expiry handler if DMA wasn't active. */
 105        if (likely(expiry != NULL))
 106                return expiry(drive);
 107
 108        /* If there was no handler, "emulate" that for ide_timer_expiry()... */
 109        return -1;
 110}
 111
 112static void tc86c001_dma_start(ide_drive_t *drive)
 113{
 114        ide_hwif_t *hwif        = drive->hwif;
 115        unsigned long sc_base   = hwif->config_data;
 116        unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
 117        unsigned long nsectors  = blk_rq_sectors(hwif->rq);
 118
 119        /*
 120         * We have to manually load the sector count and size into
 121         * the appropriate system control registers for DMA to work
 122         * with LBA48 and ATAPI devices...
 123         */
 124        outw(nsectors, sc_base + 0x0a); /* Sector Count */
 125        outw(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */
 126
 127        /* Install our timeout expiry hook, saving the current handler... */
 128        ide_set_hwifdata(hwif, hwif->expiry);
 129        hwif->expiry = &tc86c001_timer_expiry;
 130
 131        ide_dma_start(drive);
 132}
 133
 134static u8 tc86c001_cable_detect(ide_hwif_t *hwif)
 135{
 136        struct pci_dev *dev = to_pci_dev(hwif->dev);
 137        unsigned long sc_base = pci_resource_start(dev, 5);
 138        u16 scr1 = inw(sc_base + 0x00);
 139
 140        /*
 141         * System Control  1 Register bit 13 (PDIAGN):
 142         * 0=80-pin cable, 1=40-pin cable
 143         */
 144        return (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 145}
 146
 147static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
 148{
 149        struct pci_dev *dev     = to_pci_dev(hwif->dev);
 150        unsigned long sc_base   = pci_resource_start(dev, 5);
 151        u16 scr1                = inw(sc_base + 0x00);
 152
 153        /* System Control 1 Register bit 15 (Soft Reset) set */
 154        outw(scr1 |  0x8000, sc_base + 0x00);
 155
 156        /* System Control 1 Register bit 14 (FIFO Reset) set */
 157        outw(scr1 |  0x4000, sc_base + 0x00);
 158
 159        /* System Control 1 Register: reset clear */
 160        outw(scr1 & ~0xc000, sc_base + 0x00);
 161
 162        /* Store the system control register base for convenience... */
 163        hwif->config_data = sc_base;
 164
 165        if (!hwif->dma_base)
 166                return;
 167
 168        /*
 169         * Sector Count Control Register bits 0 and 1 set:
 170         * software sets Sector Count Register for master and slave device
 171         */
 172        outw(0x0003, sc_base + 0x0c);
 173
 174        /* Sector Count Register limit */
 175        hwif->rqsize     = 0xffff;
 176}
 177
 178static const struct ide_port_ops tc86c001_port_ops = {
 179        .set_pio_mode           = tc86c001_set_pio_mode,
 180        .set_dma_mode           = tc86c001_set_mode,
 181        .cable_detect           = tc86c001_cable_detect,
 182};
 183
 184static const struct ide_dma_ops tc86c001_dma_ops = {
 185        .dma_host_set           = ide_dma_host_set,
 186        .dma_setup              = ide_dma_setup,
 187        .dma_start              = tc86c001_dma_start,
 188        .dma_end                = ide_dma_end,
 189        .dma_test_irq           = ide_dma_test_irq,
 190        .dma_lost_irq           = ide_dma_lost_irq,
 191        .dma_timer_expiry       = ide_dma_sff_timer_expiry,
 192        .dma_sff_read_status    = ide_dma_sff_read_status,
 193};
 194
 195static const struct ide_port_info tc86c001_chipset __devinitconst = {
 196        .name           = DRV_NAME,
 197        .init_hwif      = init_hwif_tc86c001,
 198        .port_ops       = &tc86c001_port_ops,
 199        .dma_ops        = &tc86c001_dma_ops,
 200        .host_flags     = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD,
 201        .pio_mask       = ATA_PIO4,
 202        .mwdma_mask     = ATA_MWDMA2,
 203        .udma_mask      = ATA_UDMA4,
 204};
 205
 206static int __devinit tc86c001_init_one(struct pci_dev *dev,
 207                                       const struct pci_device_id *id)
 208{
 209        int rc;
 210
 211        rc = pci_enable_device(dev);
 212        if (rc)
 213                goto out;
 214
 215        rc = pci_request_region(dev, 5, DRV_NAME);
 216        if (rc) {
 217                printk(KERN_ERR DRV_NAME ": system control regs already in use");
 218                goto out_disable;
 219        }
 220
 221        rc = ide_pci_init_one(dev, &tc86c001_chipset, NULL);
 222        if (rc)
 223                goto out_release;
 224
 225        goto out;
 226
 227out_release:
 228        pci_release_region(dev, 5);
 229out_disable:
 230        pci_disable_device(dev);
 231out:
 232        return rc;
 233}
 234
 235static void __devexit tc86c001_remove(struct pci_dev *dev)
 236{
 237        ide_pci_remove(dev);
 238        pci_release_region(dev, 5);
 239        pci_disable_device(dev);
 240}
 241
 242static const struct pci_device_id tc86c001_pci_tbl[] = {
 243        { PCI_VDEVICE(TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE), 0 },
 244        { 0, }
 245};
 246MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl);
 247
 248static struct pci_driver tc86c001_pci_driver = {
 249        .name           = "TC86C001",
 250        .id_table       = tc86c001_pci_tbl,
 251        .probe          = tc86c001_init_one,
 252        .remove         = __devexit_p(tc86c001_remove),
 253};
 254
 255static int __init tc86c001_ide_init(void)
 256{
 257        return ide_pci_register_driver(&tc86c001_pci_driver);
 258}
 259
 260static void __exit tc86c001_ide_exit(void)
 261{
 262        pci_unregister_driver(&tc86c001_pci_driver);
 263}
 264
 265module_init(tc86c001_ide_init);
 266module_exit(tc86c001_ide_exit);
 267
 268MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
 269MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE");
 270MODULE_LICENSE("GPL");
 271
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