drivers/ide/pci/tc86c001.c

   1 /*
   2  * drivers/ide/pci/tc86c001.c   Version 1.01    Sep 5, 2007
   3  *
   4  * Copyright (C) 2002 Toshiba Corporation
   5  * Copyright (C) 2005-2006 MontaVista Software, Inc. <source@mvista.com>
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2.  This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <linux/types.h>
  13 #include <linux/pci.h>
  14 #include <linux/ide.h>
  15
  16 static void tc86c001_set_mode(ide_drive_t *drive, const u8 speed)
  17 {
  18         ide_hwif_t *hwif        = HWIF(drive);
  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        = HWIF(drive);
  66         ide_expiry_t *expiry    = ide_get_hwifdata(hwif);
  67         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
  68         u8 dma_stat             = inb(hwif->dma_status);
  69
  70         /* Restore a higher level driver's expiry handler first. */
  71         hwgroup->expiry = expiry;
  72
  73         if ((dma_stat & 5) == 1) {      /* DMA active and no interrupt */
  74                 unsigned long sc_base   = hwif->config_data;
  75                 unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
  76                 u8 dma_cmd              = inb(hwif->dma_command);
  77
  78                 printk(KERN_WARNING "%s: DMA interrupt possibly stuck, "
  79                        "attempting recovery...\n", drive->name);
  80
  81                 /* Stop DMA */
  82                 outb(dma_cmd & ~0x01, hwif->dma_command);
  83
  84                 /* Setup the dummy DMA transfer */
  85                 outw(0, sc_base + 0x0a);        /* Sector Count */
  86                 outw(0, twcr_port);     /* Transfer Word Count 1 or 2 */
  87
  88                 /* Start the dummy DMA transfer */
  89                 outb(0x00, hwif->dma_command); /* clear R_OR_WCTR for write */
  90                 outb(0x01, hwif->dma_command); /* set START_STOPBM */
  91
  92                 /*
  93                  * If an interrupt was pending, it should come thru shortly.
  94                  * If not, a higher level driver's expiry handler should
  95                  * eventually cause some kind of recovery from the DMA stall.
  96                  */
  97                 return WAIT_MIN_SLEEP;
  98         }
  99
 100         /* Chain to the restored expiry handler if DMA wasn't active. */
 101         if (likely(expiry != NULL))
 102                 return expiry(drive);
 103
 104         /* If there was no handler, "emulate" that for ide_timer_expiry()... */
 105         return -1;
 106 }
 107
 108 static void tc86c001_dma_start(ide_drive_t *drive)
 109 {
 110         ide_hwif_t *hwif        = HWIF(drive);
 111         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 112         unsigned long sc_base   = hwif->config_data;
 113         unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
 114         unsigned long nsectors  = hwgroup->rq->nr_sectors;
 115
 116         /*
 117          * We have to manually load the sector count and size into
 118          * the appropriate system control registers for DMA to work
 119          * with LBA48 and ATAPI devices...
 120          */
 121         outw(nsectors, sc_base + 0x0a); /* Sector Count */
 122         outw(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */
 123
 124         /* Install our timeout expiry hook, saving the current handler... */
 125         ide_set_hwifdata(hwif, hwgroup->expiry);
 126         hwgroup->expiry = &tc86c001_timer_expiry;
 127
 128         ide_dma_start(drive);
 129 }
 130
 131 static int tc86c001_busproc(ide_drive_t *drive, int state)
 132 {
 133         ide_hwif_t *hwif        = HWIF(drive);
 134         unsigned long sc_base   = hwif->config_data;
 135         u16 scr1;
 136
 137         /* System Control 1 Register bit 11 (ATA Hard Reset) read */
 138         scr1 = inw(sc_base + 0x00);
 139
 140         switch (state) {
 141                 case BUSSTATE_ON:
 142                         if (!(scr1 & 0x0800))
 143                                 return 0;
 144                         scr1 &= ~0x0800;
 145
 146                         hwif->drives[0].failures = hwif->drives[1].failures = 0;
 147                         break;
 148                 case BUSSTATE_OFF:
 149                         if (scr1 & 0x0800)
 150                                 return 0;
 151                         scr1 |= 0x0800;
 152
 153                         hwif->drives[0].failures = hwif->drives[0].max_failures + 1;
 154                         hwif->drives[1].failures = hwif->drives[1].max_failures + 1;
 155                         break;
 156                 default:
 157                         return -EINVAL;
 158         }
 159
 160         /* System Control 1 Register bit 11 (ATA Hard Reset) write */
 161         outw(scr1, sc_base + 0x00);
 162         return 0;
 163 }
 164
 165 static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
 166 {
 167         struct pci_dev *dev     = to_pci_dev(hwif->dev);
 168         unsigned long sc_base   = pci_resource_start(dev, 5);
 169         u16 scr1                = inw(sc_base + 0x00);
 170
 171         /* System Control 1 Register bit 15 (Soft Reset) set */
 172         outw(scr1 |  0x8000, sc_base + 0x00);
 173
 174         /* System Control 1 Register bit 14 (FIFO Reset) set */
 175         outw(scr1 |  0x4000, sc_base + 0x00);
 176
 177         /* System Control 1 Register: reset clear */
 178         outw(scr1 & ~0xc000, sc_base + 0x00);
 179
 180         /* Store the system control register base for convenience... */
 181         hwif->config_data = sc_base;
 182
 183         hwif->set_pio_mode = &tc86c001_set_pio_mode;
 184         hwif->set_dma_mode = &tc86c001_set_mode;
 185
 186         hwif->busproc   = &tc86c001_busproc;
 187
 188         if (!hwif->dma_base)
 189                 return;
 190
 191         /*
 192          * Sector Count Control Register bits 0 and 1 set:
 193          * software sets Sector Count Register for master and slave device
 194          */
 195         outw(0x0003, sc_base + 0x0c);
 196
 197         /* Sector Count Register limit */
 198         hwif->rqsize     = 0xffff;
 199
 200         hwif->dma_start         = &tc86c001_dma_start;
 201
 202         if (hwif->cbl != ATA_CBL_PATA40_SHORT) {
 203                 /*
 204                  * System Control  1 Register bit 13 (PDIAGN):
 205                  * 0=80-pin cable, 1=40-pin cable
 206                  */
 207                 scr1 = inw(sc_base + 0x00);
 208                 hwif->cbl = (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 209         }
 210 }
 211
 212 static unsigned int __devinit init_chipset_tc86c001(struct pci_dev *dev,
 213                                                         const char *name)
 214 {
 215         int err = pci_request_region(dev, 5, name);
 216
 217         if (err)
 218                 printk(KERN_ERR "%s: system control regs already in use", name);
 219         return err;
 220 }
 221
 222 static const struct ide_port_info tc86c001_chipset __devinitdata = {
 223         .name           = "TC86C001",
 224         .init_chipset   = init_chipset_tc86c001,
 225         .init_hwif      = init_hwif_tc86c001,
 226         .host_flags     = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD |
 227                           IDE_HFLAG_ABUSE_SET_DMA_MODE,
 228         .pio_mask       = ATA_PIO4,
 229         .mwdma_mask     = ATA_MWDMA2,
 230         .udma_mask      = ATA_UDMA4,
 231 };
 232
 233 static int __devinit tc86c001_init_one(struct pci_dev *dev,
 234                                        const struct pci_device_id *id)
 235 {
 236         return ide_setup_pci_device(dev, &tc86c001_chipset);
 237 }
 238
 239 static const struct pci_device_id tc86c001_pci_tbl[] = {
 240         { PCI_VDEVICE(TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE), 0 },
 241         { 0, }
 242 };
 243 MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl);
 244
 245 static struct pci_driver driver = {
 246         .name           = "TC86C001",
 247         .id_table       = tc86c001_pci_tbl,
 248         .probe          = tc86c001_init_one
 249 };
 250
 251 static int __init tc86c001_ide_init(void)
 252 {
 253         return ide_pci_register_driver(&driver);
 254 }
 255 module_init(tc86c001_ide_init);
 256
 257 MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
 258 MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE");
 259 MODULE_LICENSE("GPL");