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/*

 * 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);