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pata_triflex.c

/*
 * pata_triflex.c       - Compaq PATA for new ATA layer
 *                  (C) 2005 Red Hat Inc
 *                  Alan Cox <alan@redhat.com>
 *
 * based upon
 *
 * triflex.c
 *
 * IDE Chipset driver for the Compaq TriFlex IDE controller.
 *
 * Known to work with the Compaq Workstation 5x00 series.
 *
 * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
 * Author: Torben Mathiasen <torben.mathiasen@hp.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Loosely based on the piix & svwks drivers.
 *
 * Documentation:
 *    Not publically available.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>

#define DRV_NAME "pata_triflex"
#define DRV_VERSION "0.2.8"

/**
 *    triflex_prereset        -     probe begin
 *    @link: ATA link
 *    @deadline: deadline jiffies for the operation
 *
 *    Set up cable type and use generic probe init
 */

static int triflex_prereset(struct ata_link *link, unsigned long deadline)
{
      static const struct pci_bits triflex_enable_bits[] = {
            { 0x80, 1, 0x01, 0x01 },
            { 0x80, 1, 0x02, 0x02 }
      };

      struct ata_port *ap = link->ap;
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);

      if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
            return -ENOENT;

      return ata_std_prereset(link, deadline);
}



static void triflex_error_handler(struct ata_port *ap)
{
      ata_bmdma_drive_eh(ap, triflex_prereset, ata_std_softreset, NULL, ata_std_postreset);
}

/**
 *    triflex_load_timing           -     timing configuration
 *    @ap: ATA interface
 *    @adev: Device on the bus
 *    @speed: speed to configure
 *
 *    The Triflex has one set of timings per device per channel. This
 *    means we must do some switching. As the PIO and DMA timings don't
 *    match we have to do some reloading unlike PIIX devices where tuning
 *    tricks can avoid it.
 */

static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
{
      struct pci_dev *pdev = to_pci_dev(ap->host->dev);
      u32 timing = 0;
      u32 triflex_timing, old_triflex_timing;
      int channel_offset = ap->port_no ? 0x74: 0x70;
      unsigned int is_slave   = (adev->devno != 0);


      pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
      triflex_timing = old_triflex_timing;

      switch(speed)
      {
            case XFER_MW_DMA_2:
                  timing = 0x0103;break;
            case XFER_MW_DMA_1:
                  timing = 0x0203;break;
            case XFER_MW_DMA_0:
                  timing = 0x0808;break;
            case XFER_SW_DMA_2:
            case XFER_SW_DMA_1:
            case XFER_SW_DMA_0:
                  timing = 0x0F0F;break;
            case XFER_PIO_4:
                  timing = 0x0202;break;
            case XFER_PIO_3:
                  timing = 0x0204;break;
            case XFER_PIO_2:
                  timing = 0x0404;break;
            case XFER_PIO_1:
                  timing = 0x0508;break;
            case XFER_PIO_0:
                  timing = 0x0808;break;
            default:
                  BUG();
      }
      triflex_timing &= ~ (0xFFFF << (16 * is_slave));
      triflex_timing |= (timing << (16 * is_slave));

      if (triflex_timing != old_triflex_timing)
            pci_write_config_dword(pdev, channel_offset, triflex_timing);
}

/**
 *    triflex_set_piomode     -     set initial PIO mode data
 *    @ap: ATA interface
 *    @adev: ATA device
 *
 *    Use the timing loader to set up the PIO mode. We have to do this
 *    because DMA start/stop will only be called once DMA occurs. If there
 *    has been no DMA then the PIO timings are still needed.
 */
static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
      triflex_load_timing(ap, adev, adev->pio_mode);
}

/**
 *    triflex_dma_start -     DMA start callback
 *    @qc: Command in progress
 *
 *    Usually drivers set the DMA timing at the point the set_dmamode call
 *    is made. Triflex however requires we load new timings on the
 *    transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
 *    We load the DMA timings just before starting DMA and then restore
 *    the PIO timing when the DMA is finished.
 */

static void triflex_bmdma_start(struct ata_queued_cmd *qc)
{
      triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
      ata_bmdma_start(qc);
}

/**
 *    triflex_dma_stop  -     DMA stop callback
 *    @ap: ATA interface
 *    @adev: ATA device
 *
 *    We loaded new timings in dma_start, as a result we need to restore
 *    the PIO timings in dma_stop so that the next command issue gets the
 *    right clock values.
 */

static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
{
      ata_bmdma_stop(qc);
      triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
}

static struct scsi_host_template triflex_sht = {
      .module                 = THIS_MODULE,
      .name             = DRV_NAME,
      .ioctl                  = ata_scsi_ioctl,
      .queuecommand           = ata_scsi_queuecmd,
      .can_queue        = ATA_DEF_QUEUE,
      .this_id          = ATA_SHT_THIS_ID,
      .sg_tablesize           = LIBATA_MAX_PRD,
      .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
      .emulated         = ATA_SHT_EMULATED,
      .use_clustering         = ATA_SHT_USE_CLUSTERING,
      .proc_name        = DRV_NAME,
      .dma_boundary           = ATA_DMA_BOUNDARY,
      .slave_configure  = ata_scsi_slave_config,
      .slave_destroy          = ata_scsi_slave_destroy,
      .bios_param       = ata_std_bios_param,
};

static struct ata_port_operations triflex_port_ops = {
      .set_piomode      = triflex_set_piomode,
      .mode_filter      = ata_pci_default_filter,

      .tf_load    = ata_tf_load,
      .tf_read    = ata_tf_read,
      .check_status     = ata_check_status,
      .exec_command     = ata_exec_command,
      .dev_select       = ata_std_dev_select,

      .freeze           = ata_bmdma_freeze,
      .thaw       = ata_bmdma_thaw,
      .error_handler    = triflex_error_handler,
      .post_internal_cmd = ata_bmdma_post_internal_cmd,
      .cable_detect     = ata_cable_40wire,

      .bmdma_setup      = ata_bmdma_setup,
      .bmdma_start      = triflex_bmdma_start,
      .bmdma_stop = triflex_bmdma_stop,
      .bmdma_status     = ata_bmdma_status,

      .qc_prep    = ata_qc_prep,
      .qc_issue   = ata_qc_issue_prot,

      .data_xfer  = ata_data_xfer,

      .irq_handler      = ata_interrupt,
      .irq_clear  = ata_bmdma_irq_clear,
      .irq_on           = ata_irq_on,

      .port_start = ata_sff_port_start,
};

static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
      static const struct ata_port_info info = {
            .sht = &triflex_sht,
            .flags = ATA_FLAG_SLAVE_POSS,
            .pio_mask = 0x1f,
            .mwdma_mask = 0x07,
            .port_ops = &triflex_port_ops
      };
      const struct ata_port_info *ppi[] = { &info, NULL };
      static int printed_version;

      if (!printed_version++)
            dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");

      return ata_pci_init_one(dev, ppi);
}

static const struct pci_device_id triflex[] = {
      { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },

      { },
};

static struct pci_driver triflex_pci_driver = {
      .name             = DRV_NAME,
      .id_table   = triflex,
      .probe            = triflex_init_one,
      .remove           = ata_pci_remove_one,
#ifdef CONFIG_PM
      .suspend    = ata_pci_device_suspend,
      .resume           = ata_pci_device_resume,
#endif
};

static int __init triflex_init(void)
{
      return pci_register_driver(&triflex_pci_driver);
}

static void __exit triflex_exit(void)
{
      pci_unregister_driver(&triflex_pci_driver);
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, triflex);
MODULE_VERSION(DRV_VERSION);

module_init(triflex_init);
module_exit(triflex_exit);

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