it8213.c

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/*
 * ITE 8213 IDE driver
 *
 * Copyright (C) 2006 Jack Lee
 * Copyright (C) 2006 Alan Cox
 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/init.h>

#define DRV_NAME "it8213"

static void it8213_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
    struct pci_dev *dev = to_pci_dev(hwif->dev);
    int is_slave        = drive->dn & 1;
    int master_port     = 0x40;
    int slave_port      = 0x44;
    unsigned long flags;
    u16 master_data;
    u8 slave_data;
    static DEFINE_SPINLOCK(tune_lock);
    int control = 0;
    const u8 pio = drive->pio_mode - XFER_PIO_0;

    static const u8 timings[][2] = {
                    { 0, 0 },
                    { 0, 0 },
                    { 1, 0 },
                    { 2, 1 },
                    { 2, 3 }, };

    spin_lock_irqsave(&tune_lock, flags);
    pci_read_config_word(dev, master_port, &master_data);

    if (pio > 1)
        control |= 1;   /* Programmable timing on */
    if (drive->media != ide_disk)
        control |= 4;   /* ATAPI */
    if (ide_pio_need_iordy(drive, pio))
        control |= 2;   /* IORDY */
    if (is_slave) {
        master_data |=  0x4000;
        master_data &= ~0x0070;
        if (pio > 1)
            master_data = master_data | (control << 4);
        pci_read_config_byte(dev, slave_port, &slave_data);
        slave_data = slave_data & 0xf0;
        slave_data = slave_data | (timings[pio][0] << 2) | timings[pio][1];
    } else {
        master_data &= ~0x3307;
        if (pio > 1)
            master_data = master_data | control;
        master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
    }
    pci_write_config_word(dev, master_port, master_data);
    if (is_slave)
        pci_write_config_byte(dev, slave_port, slave_data);
    spin_unlock_irqrestore(&tune_lock, flags);
}

static void it8213_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
{
    struct pci_dev *dev = to_pci_dev(hwif->dev);
    u8 maslave      = 0x40;
    int a_speed     = 3 << (drive->dn * 4);
    int u_flag      = 1 << drive->dn;
    int v_flag      = 0x01 << drive->dn;
    int w_flag      = 0x10 << drive->dn;
    int u_speed     = 0;
    u16         reg4042, reg4a;
    u8          reg48, reg54, reg55;
    const u8 speed      = drive->dma_mode;

    pci_read_config_word(dev, maslave, &reg4042);
    pci_read_config_byte(dev, 0x48, &reg48);
    pci_read_config_word(dev, 0x4a, &reg4a);
    pci_read_config_byte(dev, 0x54, &reg54);
    pci_read_config_byte(dev, 0x55, &reg55);

    if (speed >= XFER_UDMA_0) {
        u8 udma = speed - XFER_UDMA_0;

        u_speed = min_t(u8, 2 - (udma & 1), udma) << (drive->dn * 4);

        if (!(reg48 & u_flag))
            pci_write_config_byte(dev, 0x48, reg48 | u_flag);
        if (speed >= XFER_UDMA_5)
            pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
        else
            pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);

        if ((reg4a & a_speed) != u_speed)
            pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
        if (speed > XFER_UDMA_2) {
            if (!(reg54 & v_flag))
                pci_write_config_byte(dev, 0x54, reg54 | v_flag);
        } else
            pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
    } else {
        const u8 mwdma_to_pio[] = { 0, 3, 4 };

        if (reg48 & u_flag)
            pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
        if (reg4a & a_speed)
            pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
        if (reg54 & v_flag)
            pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
        if (reg55 & w_flag)
            pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);

        if (speed >= XFER_MW_DMA_0)
            drive->pio_mode =
                mwdma_to_pio[speed - XFER_MW_DMA_0] + XFER_PIO_0;
        else
            drive->pio_mode = XFER_PIO_2; /* for SWDMA2 */

        it8213_set_pio_mode(hwif, drive);
    }
}

static u8 it8213_cable_detect(ide_hwif_t *hwif)
{
    struct pci_dev *dev = to_pci_dev(hwif->dev);
    u8 reg42h = 0;

    pci_read_config_byte(dev, 0x42, &reg42h);

    return (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
}

static const struct ide_port_ops it8213_port_ops = {
    .set_pio_mode       = it8213_set_pio_mode,
    .set_dma_mode       = it8213_set_dma_mode,
    .cable_detect       = it8213_cable_detect,
};

static const struct ide_port_info it8213_chipset __devinitconst = {
    .name       = DRV_NAME,
    .enablebits = { {0x41, 0x80, 0x80} },
    .port_ops   = &it8213_port_ops,
    .host_flags = IDE_HFLAG_SINGLE,
    .pio_mask   = ATA_PIO4,
    .swdma_mask = ATA_SWDMA2_ONLY,
    .mwdma_mask = ATA_MWDMA12_ONLY,
    .udma_mask  = ATA_UDMA6,
};

static int __devinit it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
    return ide_pci_init_one(dev, &it8213_chipset, NULL);
}

static const struct pci_device_id it8213_pci_tbl[] = {
    { PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), 0 },
    { 0, },
};

MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);

static struct pci_driver it8213_pci_driver = {
    .name       = "ITE8213_IDE",
    .id_table   = it8213_pci_tbl,
    .probe      = it8213_init_one,
    .remove     = ide_pci_remove,
    .suspend    = ide_pci_suspend,
    .resume     = ide_pci_resume,
};

static int __init it8213_ide_init(void)
{
    return ide_pci_register_driver(&it8213_pci_driver);
}

static void __exit it8213_ide_exit(void)
{
    pci_unregister_driver(&it8213_pci_driver);
}

module_init(it8213_ide_init);
module_exit(it8213_ide_exit);

MODULE_AUTHOR("Jack Lee, Alan Cox");
MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
MODULE_LICENSE("GPL");