release/src-rt-6.x.4708/linux/linux-2.6.36/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_hwif_t *hwif, ide_drive_t *drive)
  17 {
  18         unsigned long scr_port  = hwif->config_data + (drive->dn ? 0x02 : 0x00);
  19         u16 mode, scr           = inw(scr_port);
  20         const u8 speed          = drive->dma_mode;
  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_hwif_t *hwif, ide_drive_t *drive)
  45 {
  46         drive->dma_mode = drive->pio_mode;
  47         tc86c001_set_mode(hwif, drive);
  48 }
  49
  50 static int tc86c001_timer_expiry(ide_drive_t *drive)
  51 {
  52         ide_hwif_t *hwif        = drive->hwif;
  53         ide_expiry_t *expiry    = ide_get_hwifdata(hwif);
  54         u8 dma_stat             = inb(hwif->dma_base + ATA_DMA_STATUS);
  55
  56         /* Restore a higher level driver's expiry handler first. */
  57         hwif->expiry = expiry;
  58
  59         if ((dma_stat & 5) == 1) {      /* DMA active and no interrupt */
  60                 unsigned long sc_base   = hwif->config_data;
  61                 unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
  62                 u8 dma_cmd              = inb(hwif->dma_base + ATA_DMA_CMD);
  63
  64                 printk(KERN_WARNING "%s: DMA interrupt possibly stuck, "
  65                        "attempting recovery...\n", drive->name);
  66
  67                 /* Stop DMA */
  68                 outb(dma_cmd & ~0x01, hwif->dma_base + ATA_DMA_CMD);
  69
  70                 /* Setup the dummy DMA transfer */
  71                 outw(0, sc_base + 0x0a);        /* Sector Count */
  72                 outw(0, twcr_port);     /* Transfer Word Count 1 or 2 */
  73
  74                 /* Start the dummy DMA transfer */
  75
  76                 /* clear R_OR_WCTR for write */
  77                 outb(0x00, hwif->dma_base + ATA_DMA_CMD);
  78                 /* set START_STOPBM */
  79                 outb(0x01, hwif->dma_base + ATA_DMA_CMD);
  80
  81                 /*
  82                  * If an interrupt was pending, it should come thru shortly.
  83                  * If not, a higher level driver's expiry handler should
  84                  * eventually cause some kind of recovery from the DMA stall.
  85                  */
  86                 return WAIT_MIN_SLEEP;
  87         }
  88
  89         /* Chain to the restored expiry handler if DMA wasn't active. */
  90         if (likely(expiry != NULL))
  91                 return expiry(drive);
  92
  93         /* If there was no handler, "emulate" that for ide_timer_expiry()... */
  94         return -1;
  95 }
  96
  97 static void tc86c001_dma_start(ide_drive_t *drive)
  98 {
  99         ide_hwif_t *hwif        = drive->hwif;
 100         unsigned long sc_base   = hwif->config_data;
 101         unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
 102         unsigned long nsectors  = blk_rq_sectors(hwif->rq);
 103
 104         /*
 105          * We have to manually load the sector count and size into
 106          * the appropriate system control registers for DMA to work
 107          * with LBA48 and ATAPI devices...
 108          */
 109         outw(nsectors, sc_base + 0x0a); /* Sector Count */
 110         outw(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */
 111
 112         /* Install our timeout expiry hook, saving the current handler... */
 113         ide_set_hwifdata(hwif, hwif->expiry);
 114         hwif->expiry = &tc86c001_timer_expiry;
 115
 116         ide_dma_start(drive);
 117 }
 118
 119 static u8 tc86c001_cable_detect(ide_hwif_t *hwif)
 120 {
 121         struct pci_dev *dev = to_pci_dev(hwif->dev);
 122         unsigned long sc_base = pci_resource_start(dev, 5);
 123         u16 scr1 = inw(sc_base + 0x00);
 124
 125         /*
 126          * System Control  1 Register bit 13 (PDIAGN):
 127          * 0=80-pin cable, 1=40-pin cable
 128          */
 129         return (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 130 }
 131
 132 static void __devinit init_hwif_tc86c001(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         /* System Control 1 Register bit 15 (Soft Reset) set */
 139         outw(scr1 |  0x8000, sc_base + 0x00);
 140
 141         /* System Control 1 Register bit 14 (FIFO Reset) set */
 142         outw(scr1 |  0x4000, sc_base + 0x00);
 143
 144         /* System Control 1 Register: reset clear */
 145         outw(scr1 & ~0xc000, sc_base + 0x00);
 146
 147         /* Store the system control register base for convenience... */
 148         hwif->config_data = sc_base;
 149
 150         if (!hwif->dma_base)
 151                 return;
 152
 153         /*
 154          * Sector Count Control Register bits 0 and 1 set:
 155          * software sets Sector Count Register for master and slave device
 156          */
 157         outw(0x0003, sc_base + 0x0c);
 158
 159         /* Sector Count Register limit */
 160         hwif->rqsize     = 0xffff;
 161 }
 162
 163 static const struct ide_port_ops tc86c001_port_ops = {
 164         .set_pio_mode           = tc86c001_set_pio_mode,
 165         .set_dma_mode           = tc86c001_set_mode,
 166         .cable_detect           = tc86c001_cable_detect,
 167 };
 168
 169 static const struct ide_dma_ops tc86c001_dma_ops = {
 170         .dma_host_set           = ide_dma_host_set,
 171         .dma_setup              = ide_dma_setup,
 172         .dma_start              = tc86c001_dma_start,
 173         .dma_end                = ide_dma_end,
 174         .dma_test_irq           = ide_dma_test_irq,
 175         .dma_lost_irq           = ide_dma_lost_irq,
 176         .dma_timer_expiry       = ide_dma_sff_timer_expiry,
 177         .dma_sff_read_status    = ide_dma_sff_read_status,
 178 };
 179
 180 static const struct ide_port_info tc86c001_chipset __devinitdata = {
 181         .name           = DRV_NAME,
 182         .init_hwif      = init_hwif_tc86c001,
 183         .port_ops       = &tc86c001_port_ops,
 184         .dma_ops        = &tc86c001_dma_ops,
 185         .host_flags     = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD,
 186         .pio_mask       = ATA_PIO4,
 187         .mwdma_mask     = ATA_MWDMA2,
 188         .udma_mask      = ATA_UDMA4,
 189 };
 190
 191 static int __devinit tc86c001_init_one(struct pci_dev *dev,
 192                                        const struct pci_device_id *id)
 193 {
 194         int rc;
 195
 196         rc = pci_enable_device(dev);
 197         if (rc)
 198                 goto out;
 199
 200         rc = pci_request_region(dev, 5, DRV_NAME);
 201         if (rc) {
 202                 printk(KERN_ERR DRV_NAME ": system control regs already in use");
 203                 goto out_disable;
 204         }
 205
 206         rc = ide_pci_init_one(dev, &tc86c001_chipset, NULL);
 207         if (rc)
 208                 goto out_release;
 209
 210         goto out;
 211
 212 out_release:
 213         pci_release_region(dev, 5);
 214 out_disable:
 215         pci_disable_device(dev);
 216 out:
 217         return rc;
 218 }
 219
 220 static void __devexit tc86c001_remove(struct pci_dev *dev)
 221 {
 222         ide_pci_remove(dev);
 223         pci_release_region(dev, 5);
 224         pci_disable_device(dev);
 225 }
 226
 227 static const struct pci_device_id tc86c001_pci_tbl[] = {
 228         { PCI_VDEVICE(TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE), 0 },
 229         { 0, }
 230 };
 231 MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl);
 232
 233 static struct pci_driver tc86c001_pci_driver = {
 234         .name           = "TC86C001",
 235         .id_table       = tc86c001_pci_tbl,
 236         .probe          = tc86c001_init_one,
 237         .remove         = __devexit_p(tc86c001_remove),
 238 };
 239
 240 static int __init tc86c001_ide_init(void)
 241 {
 242         return ide_pci_register_driver(&tc86c001_pci_driver);
 243 }
 244
 245 static void __exit tc86c001_ide_exit(void)
 246 {
 247         pci_unregister_driver(&tc86c001_pci_driver);
 248 }
 249
 250 module_init(tc86c001_ide_init);
 251 module_exit(tc86c001_ide_exit);
 252
 253 MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
 254 MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE");
 255 MODULE_LICENSE("GPL");