pata_opti.c

Go to the documentation of this file.

/*
 * pata_opti.c  - ATI PATA for new ATA layer
 *            (C) 2005 Red Hat Inc
 *
 * Based on
 *  linux/drivers/ide/pci/opti621.c     Version 0.7 Sept 10, 2002
 *
 *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
 *
 * Authors:
 * Jaromir Koutek <[email protected]>,
 * Jan Harkes <[email protected]>,
 * Mark Lord <[email protected]>
 * Some parts of code are from ali14xx.c and from rz1000.c.
 *
 * Also consulted the FreeBSD prototype driver by Kevin Day to try
 * and resolve some confusions. Further documentation can be found in
 * Ralf Brown's interrupt list
 *
 * If you have other variants of the Opti range (Viper/Vendetta) please
 * try this driver with those PCI idents and report back. For the later
 * chips see the pata_optidma driver
 *
 */

#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_opti"
#define DRV_VERSION "0.2.9"

enum {
    READ_REG    = 0,    /* index of Read cycle timing register */
    WRITE_REG   = 1,    /* index of Write cycle timing register */
    CNTRL_REG   = 3,    /* index of Control register */
    STRAP_REG   = 5,    /* index of Strap register */
    MISC_REG    = 6 /* index of Miscellaneous register */
};

static int opti_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 opti_enable_bits[] = {
        { 0x45, 1, 0x80, 0x00 },
        { 0x40, 1, 0x08, 0x00 }
    };

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

    return ata_sff_prereset(link, deadline);
}

static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
{
    void __iomem *regio = ap->ioaddr.cmd_addr;

    /* These 3 unlock the control register access */
    ioread16(regio + 1);
    ioread16(regio + 1);
    iowrite8(3, regio + 2);

    /* Do the I/O */
    iowrite8(val, regio + reg);

    /* Relock */
    iowrite8(0x83, regio + 2);
}

static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
    struct ata_device *pair = ata_dev_pair(adev);
    int clock;
    int pio = adev->pio_mode - XFER_PIO_0;
    void __iomem *regio = ap->ioaddr.cmd_addr;
    u8 addr;

    /* Address table precomputed with prefetch off and a DCLK of 2 */
    static const u8 addr_timing[2][5] = {
        { 0x30, 0x20, 0x20, 0x10, 0x10 },
        { 0x20, 0x20, 0x10, 0x10, 0x10 }
    };
    static const u8 data_rec_timing[2][5] = {
        { 0x6B, 0x56, 0x42, 0x32, 0x31 },
        { 0x58, 0x44, 0x32, 0x22, 0x21 }
    };

    iowrite8(0xff, regio + 5);
    clock = ioread16(regio + 5) & 1;

    /*
     *  As with many controllers the address setup time is shared
     *  and must suit both devices if present.
     */

    addr = addr_timing[clock][pio];
    if (pair) {
        /* Hardware constraint */
        u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
        if (pair_addr > addr)
            addr = pair_addr;
    }

    /* Commence primary programming sequence */
    opti_write_reg(ap, adev->devno, MISC_REG);
    opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
    opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
    opti_write_reg(ap, addr, MISC_REG);

    /* Programming sequence complete, override strapping */
    opti_write_reg(ap, 0x85, CNTRL_REG);
}

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

static struct ata_port_operations opti_port_ops = {
    .inherits   = &ata_sff_port_ops,
    .cable_detect   = ata_cable_40wire,
    .set_piomode    = opti_set_piomode,
    .prereset   = opti_pre_reset,
};

static int opti_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_PIO4,
        .port_ops = &opti_port_ops
    };
    const struct ata_port_info *ppi[] = { &info, NULL };

    ata_print_version_once(&dev->dev, DRV_VERSION);

    return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL, 0);
}

static const struct pci_device_id opti[] = {
    { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
    { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },

    { },
};

static struct pci_driver opti_pci_driver = {
    .name       = DRV_NAME,
    .id_table   = opti,
    .probe      = opti_init_one,
    .remove     = ata_pci_remove_one,
#ifdef CONFIG_PM
    .suspend    = ata_pci_device_suspend,
    .resume     = ata_pci_device_resume,
#endif
};

module_pci_driver(opti_pci_driver);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, opti);
MODULE_VERSION(DRV_VERSION);