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tc86c001.c

/*
 * drivers/ide/pci/tc86c001.c Version 1.01      Sep 5, 2007
 *
 * Copyright (C) 2002 Toshiba Corporation
 * Copyright (C) 2005-2006 MontaVista Software, Inc. <source@mvista.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/types.h>
#include <linux/pci.h>
#include <linux/ide.h>

static void tc86c001_set_mode(ide_drive_t *drive, const u8 speed)
{
      ide_hwif_t *hwif  = HWIF(drive);
      unsigned long scr_port  = hwif->config_data + (drive->dn ? 0x02 : 0x00);
      u16 mode, scr           = inw(scr_port);

      switch (speed) {
            case XFER_UDMA_4: mode = 0x00c0; break;
            case XFER_UDMA_3: mode = 0x00b0; break;
            case XFER_UDMA_2: mode = 0x00a0; break;
            case XFER_UDMA_1: mode = 0x0090; break;
            case XFER_UDMA_0: mode = 0x0080; break;
            case XFER_MW_DMA_2:     mode = 0x0070; break;
            case XFER_MW_DMA_1:     mode = 0x0060; break;
            case XFER_MW_DMA_0:     mode = 0x0050; break;
            case XFER_PIO_4:  mode = 0x0400; break;
            case XFER_PIO_3:  mode = 0x0300; break;
            case XFER_PIO_2:  mode = 0x0200; break;
            case XFER_PIO_1:  mode = 0x0100; break;
            case XFER_PIO_0:
            default:          mode = 0x0000; break;
      }

      scr &= (speed < XFER_MW_DMA_0) ? 0xf8ff : 0xff0f;
      scr |= mode;
      outw(scr, scr_port);
}

static void tc86c001_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
      tc86c001_set_mode(drive, XFER_PIO_0 + pio);
}

/*
 * HACKITY HACK
 *
 * This is a workaround for the limitation 5 of the TC86C001 IDE controller:
 * if a DMA transfer terminates prematurely, the controller leaves the device's
 * interrupt request (INTRQ) pending and does not generate a PCI interrupt (or
 * set the interrupt bit in the DMA status register), thus no PCI interrupt
 * will occur until a DMA transfer has been successfully completed.
 *
 * We work around this by initiating dummy, zero-length DMA transfer on
 * a DMA timeout expiration. I found no better way to do this with the current
 * IDE core than to temporarily replace a higher level driver's timer expiry
 * handler with our own backing up to that handler in case our recovery fails.
 */
static int tc86c001_timer_expiry(ide_drive_t *drive)
{
      ide_hwif_t *hwif  = HWIF(drive);
      ide_expiry_t *expiry    = ide_get_hwifdata(hwif);
      ide_hwgroup_t *hwgroup  = HWGROUP(drive);
      u8 dma_stat       = inb(hwif->dma_status);

      /* Restore a higher level driver's expiry handler first. */
      hwgroup->expiry   = expiry;

      if ((dma_stat & 5) == 1) {    /* DMA active and no interrupt */
            unsigned long sc_base   = hwif->config_data;
            unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
            u8 dma_cmd        = inb(hwif->dma_command);

            printk(KERN_WARNING "%s: DMA interrupt possibly stuck, "
                   "attempting recovery...\n", drive->name);

            /* Stop DMA */
            outb(dma_cmd & ~0x01, hwif->dma_command);

            /* Setup the dummy DMA transfer */
            outw(0, sc_base + 0x0a);      /* Sector Count */
            outw(0, twcr_port);     /* Transfer Word Count 1 or 2 */

            /* Start the dummy DMA transfer */
            outb(0x00, hwif->dma_command); /* clear R_OR_WCTR for write */
            outb(0x01, hwif->dma_command); /* set START_STOPBM */

            /*
             * If an interrupt was pending, it should come thru shortly.
             * If not, a higher level driver's expiry handler should
             * eventually cause some kind of recovery from the DMA stall.
             */
            return WAIT_MIN_SLEEP;
      }

      /* Chain to the restored expiry handler if DMA wasn't active. */
      if (likely(expiry != NULL))
            return expiry(drive);

      /* If there was no handler, "emulate" that for ide_timer_expiry()... */
      return -1;
}

static void tc86c001_dma_start(ide_drive_t *drive)
{
      ide_hwif_t *hwif  = HWIF(drive);
      ide_hwgroup_t *hwgroup  = HWGROUP(drive);
      unsigned long sc_base   = hwif->config_data;
      unsigned long twcr_port = sc_base + (drive->dn ? 0x06 : 0x04);
      unsigned long nsectors  = hwgroup->rq->nr_sectors;

      /*
       * We have to manually load the sector count and size into
       * the appropriate system control registers for DMA to work
       * with LBA48 and ATAPI devices...
       */
      outw(nsectors, sc_base + 0x0a);     /* Sector Count */
      outw(SECTOR_SIZE / 2, twcr_port); /* Transfer Word Count 1/2 */

      /* Install our timeout expiry hook, saving the current handler... */
      ide_set_hwifdata(hwif, hwgroup->expiry);
      hwgroup->expiry = &tc86c001_timer_expiry;

      ide_dma_start(drive);
}

static int tc86c001_busproc(ide_drive_t *drive, int state)
{
      ide_hwif_t *hwif  = HWIF(drive);
      unsigned long sc_base   = hwif->config_data;
      u16 scr1;

      /* System Control 1 Register bit 11 (ATA Hard Reset) read */
      scr1 = inw(sc_base + 0x00);

      switch (state) {
            case BUSSTATE_ON:
                  if (!(scr1 & 0x0800))
                        return 0;
                  scr1 &= ~0x0800;

                  hwif->drives[0].failures = hwif->drives[1].failures = 0;
                  break;
            case BUSSTATE_OFF:
                  if (scr1 & 0x0800)
                        return 0;
                  scr1 |= 0x0800;

                  hwif->drives[0].failures = hwif->drives[0].max_failures + 1;
                  hwif->drives[1].failures = hwif->drives[1].max_failures + 1;
                  break;
            default:
                  return -EINVAL;
      }

      /* System Control 1 Register bit 11 (ATA Hard Reset) write */
      outw(scr1, sc_base + 0x00);
      return 0;
}

static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
{
      unsigned long sc_base   = pci_resource_start(hwif->pci_dev, 5);
      u16 scr1          = inw(sc_base + 0x00);

      /* System Control 1 Register bit 15 (Soft Reset) set */
      outw(scr1 |  0x8000, sc_base + 0x00);

      /* System Control 1 Register bit 14 (FIFO Reset) set */
      outw(scr1 |  0x4000, sc_base + 0x00);

      /* System Control 1 Register: reset clear */
      outw(scr1 & ~0xc000, sc_base + 0x00);

      /* Store the system control register base for convenience... */
      hwif->config_data = sc_base;

      hwif->set_pio_mode = &tc86c001_set_pio_mode;
      hwif->set_dma_mode = &tc86c001_set_mode;

      hwif->busproc     = &tc86c001_busproc;

      if (!hwif->dma_base)
            return;

      /*
       * Sector Count Control Register bits 0 and 1 set:
       * software sets Sector Count Register for master and slave device
       */
      outw(0x0003, sc_base + 0x0c);

      /* Sector Count Register limit */
      hwif->rqsize       = 0xffff;

      hwif->dma_start   = &tc86c001_dma_start;

      if (hwif->cbl != ATA_CBL_PATA40_SHORT) {
            /*
             * System Control  1 Register bit 13 (PDIAGN):
             * 0=80-pin cable, 1=40-pin cable
             */
            scr1 = inw(sc_base + 0x00);
            hwif->cbl = (scr1 & 0x2000) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
      }
}

static unsigned int __devinit init_chipset_tc86c001(struct pci_dev *dev,
                                          const char *name)
{
      int err = pci_request_region(dev, 5, name);

      if (err)
            printk(KERN_ERR "%s: system control regs already in use", name);
      return err;
}

static const struct ide_port_info tc86c001_chipset __devinitdata = {
      .name       = "TC86C001",
      .init_chipset     = init_chipset_tc86c001,
      .init_hwif  = init_hwif_tc86c001,
      .host_flags = IDE_HFLAG_SINGLE | IDE_HFLAG_OFF_BOARD,
      .pio_mask   = ATA_PIO4,
      .mwdma_mask = ATA_MWDMA2,
      .udma_mask  = ATA_UDMA4,
};

static int __devinit tc86c001_init_one(struct pci_dev *dev,
                               const struct pci_device_id *id)
{
      return ide_setup_pci_device(dev, &tc86c001_chipset);
}

static const struct pci_device_id tc86c001_pci_tbl[] = {
      { PCI_VDEVICE(TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_IDE), 0 },
      { 0, }
};
MODULE_DEVICE_TABLE(pci, tc86c001_pci_tbl);

static struct pci_driver driver = {
      .name       = "TC86C001",
      .id_table   = tc86c001_pci_tbl,
      .probe            = tc86c001_init_one
};

static int __init tc86c001_ide_init(void)
{
      return ide_pci_register_driver(&driver);
}
module_init(tc86c001_ide_init);

MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
MODULE_DESCRIPTION("PCI driver module for TC86C001 IDE");
MODULE_LICENSE("GPL");

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