drivers/ide/tc86c001.c

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