pata_cypress.c

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/*
 * pata_cypress.c   - Cypress PATA for new ATA layer
 *            (C) 2006 Red Hat Inc
 *            Alan Cox
 *
 * Based heavily on
 * linux/drivers/ide/pci/cy82c693.c     Version 0.40    Sep. 10, 2002
 *
 */

#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_cypress"
#define DRV_VERSION "0.1.5"

/* here are the offset definitions for the registers */

enum {
    CY82_IDE_CMDREG     = 0x04,
    CY82_IDE_ADDRSETUP  = 0x48,
    CY82_IDE_MASTER_IOR = 0x4C,
    CY82_IDE_MASTER_IOW = 0x4D,
    CY82_IDE_SLAVE_IOR  = 0x4E,
    CY82_IDE_SLAVE_IOW  = 0x4F,
    CY82_IDE_MASTER_8BIT    = 0x50,
    CY82_IDE_SLAVE_8BIT = 0x51,

    CY82_INDEX_PORT     = 0x22,
    CY82_DATA_PORT      = 0x23,

    CY82_INDEX_CTRLREG1 = 0x01,
    CY82_INDEX_CHANNEL0 = 0x30,
    CY82_INDEX_CHANNEL1 = 0x31,
    CY82_INDEX_TIMEOUT  = 0x32
};

static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
    struct pci_dev *pdev = to_pci_dev(ap->host->dev);
    struct ata_timing t;
    const unsigned long T = 1000000 / 33;
    short time_16, time_8;
    u32 addr;

    if (ata_timing_compute(adev, adev->pio_mode, &t, T, 1) < 0) {
        printk(KERN_ERR DRV_NAME ": mome computation failed.\n");
        return;
    }

    time_16 = clamp_val(t.recover - 1, 0, 15) |
          (clamp_val(t.active - 1, 0, 15) << 4);
    time_8 = clamp_val(t.act8b - 1, 0, 15) |
         (clamp_val(t.rec8b - 1, 0, 15) << 4);

    if (adev->devno == 0) {
        pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

        addr &= ~0x0F;  /* Mask bits */
        addr |= clamp_val(t.setup - 1, 0, 15);

        pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
        pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
        pci_write_config_byte(pdev, CY82_IDE_MASTER_IOW, time_16);
        pci_write_config_byte(pdev, CY82_IDE_MASTER_8BIT, time_8);
    } else {
        pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);

        addr &= ~0xF0;  /* Mask bits */
        addr |= (clamp_val(t.setup - 1, 0, 15) << 4);

        pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
        pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);
        pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOW, time_16);
        pci_write_config_byte(pdev, CY82_IDE_SLAVE_8BIT, time_8);
    }
}

static void cy82c693_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
    int reg = CY82_INDEX_CHANNEL0 + ap->port_no;

    /* Be afraid, be very afraid. Magic registers  in low I/O space */
    outb(reg, 0x22);
    outb(adev->dma_mode - XFER_MW_DMA_0, 0x23);

    /* 0x50 gives the best behaviour on the Alpha's using this chip */
    outb(CY82_INDEX_TIMEOUT, 0x22);
    outb(0x50, 0x23);
}

static struct scsi_host_template cy82c693_sht = {
    ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations cy82c693_port_ops = {
    .inherits   = &ata_bmdma_port_ops,
    .cable_detect   = ata_cable_40wire,
    .set_piomode    = cy82c693_set_piomode,
    .set_dmamode    = cy82c693_set_dmamode,
};

static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
    static const struct ata_port_info info = {
        .flags = ATA_FLAG_SLAVE_POSS,
        .pio_mask = ATA_PIO4,
        .mwdma_mask = ATA_MWDMA2,
        .port_ops = &cy82c693_port_ops
    };
    const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };

    /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2.
       For the moment we don't handle the secondary. FIXME */

    if (PCI_FUNC(pdev->devfn) != 1)
        return -ENODEV;

    return ata_pci_bmdma_init_one(pdev, ppi, &cy82c693_sht, NULL, 0);
}

static const struct pci_device_id cy82c693[] = {
    { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), },

    { },
};

static struct pci_driver cy82c693_pci_driver = {
    .name       = DRV_NAME,
    .id_table   = cy82c693,
    .probe      = cy82c693_init_one,
    .remove     = ata_pci_remove_one,
#ifdef CONFIG_PM
    .suspend    = ata_pci_device_suspend,
    .resume     = ata_pci_device_resume,
#endif
};

module_pci_driver(cy82c693_pci_driver);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for the CY82C693 PATA controller");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cy82c693);
MODULE_VERSION(DRV_VERSION);