pata_ns87410.c

Go to the documentation of this file.

/*
 * pata_ns87410.c   - National Semiconductor 87410 PATA for new ATA layer
 *            (C) 2006 Red Hat Inc
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  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; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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_ns87410"
#define DRV_VERSION "0.4.6"

static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)
{
    struct ata_port *ap = link->ap;
    struct pci_dev *pdev = to_pci_dev(ap->host->dev);
    static const struct pci_bits ns87410_enable_bits[] = {
        { 0x43, 1, 0x08, 0x08 },
        { 0x47, 1, 0x08, 0x08 }
    };

    if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
        return -ENOENT;

    return ata_sff_prereset(link, deadline);
}

static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
    struct pci_dev *pdev = to_pci_dev(ap->host->dev);
    int port = 0x40 + 4 * ap->port_no;
    u8 idetcr, idefr;
    struct ata_timing at;

    static const u8 activebits[15] = {
        0, 1, 2, 3, 4,
        5, 5, 6, 6, 6,
        6, 7, 7, 7, 7
    };

    static const u8 recoverbits[12] = {
        0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
    };

    pci_read_config_byte(pdev, port + 3, &idefr);

    if (ata_pio_need_iordy(adev))
        idefr |= 0x04;  /* IORDY enable */
    else
        idefr &= ~0x04;

    if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
        dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode);
        return;
    }

    at.active = clamp_val(at.active, 2, 16) - 2;
    at.setup = clamp_val(at.setup, 1, 4) - 1;
    at.recover = clamp_val(at.recover, 1, 12) - 1;

    idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];

    pci_write_config_byte(pdev, port, idetcr);
    pci_write_config_byte(pdev, port + 3, idefr);
    /* We use ap->private_data as a pointer to the device currently
       loaded for timing */
    ap->private_data = adev;
}

static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)
{
    struct ata_port *ap = qc->ap;
    struct ata_device *adev = qc->dev;

    /* If modes have been configured and the channel data is not loaded
       then load it. We have to check if pio_mode is set as the core code
       does not set adev->pio_mode to XFER_PIO_0 while probing as would be
       logical */

    if (adev->pio_mode && adev != ap->private_data)
        ns87410_set_piomode(ap, adev);

    return ata_sff_qc_issue(qc);
}

static struct scsi_host_template ns87410_sht = {
    ATA_PIO_SHT(DRV_NAME),
};

static struct ata_port_operations ns87410_port_ops = {
    .inherits   = &ata_sff_port_ops,
    .qc_issue   = ns87410_qc_issue,
    .cable_detect   = ata_cable_40wire,
    .set_piomode    = ns87410_set_piomode,
    .prereset   = ns87410_pre_reset,
};

static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
    static const struct ata_port_info info = {
        .flags = ATA_FLAG_SLAVE_POSS,
        .pio_mask = ATA_PIO3,
        .port_ops = &ns87410_port_ops
    };
    const struct ata_port_info *ppi[] = { &info, NULL };
    return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0);
}

static const struct pci_device_id ns87410[] = {
    { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },

    { },
};

static struct pci_driver ns87410_pci_driver = {
    .name       = DRV_NAME,
    .id_table   = ns87410,
    .probe      = ns87410_init_one,
    .remove     = ata_pci_remove_one,
#ifdef CONFIG_PM
    .suspend    = ata_pci_device_suspend,
    .resume     = ata_pci_device_resume,
#endif
};

module_pci_driver(ns87410_pci_driver);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ns87410);
MODULE_VERSION(DRV_VERSION);