linux-imx

/*

 *    pata_radisys.c - Intel PATA/SATA controllers

 *

 *  (C) 2006 Red Hat <alan@lxorguk.ukuu.org.uk>

 *

 *    Some parts based on ata_piix.c by Jeff Garzik and others.

 *

 *    A PIIX relative, this device has a single ATA channel and no

 *    slave timings, SITRE or PPE. In that sense it is a close relative

 *    of the original PIIX. It does however support UDMA 33/66 per channel

 *    although no other modes/timings. Also lacking is 32bit I/O on the ATA

 *    port.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/blkdev.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <scsi/scsi_host.h>

#include <linux/libata.h>

#include <linux/ata.h>

​

#define DRV_NAME    "pata_radisys"

#define DRV_VERSION "0.4.4"

​

/**

 *  radisys_set_piomode - Initialize host controller PATA PIO timings

 *  @ap: ATA port

 *  @adev: Device whose timings we are configuring

 *

 *  Set PIO mode for device, in host controller PCI config space.

 *

 *  LOCKING:

 *  None (inherited from caller).

 */

​

static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev)

{

    unsigned int pio    = adev->pio_mode - XFER_PIO_0;

    struct pci_dev *dev = to_pci_dev(ap->host->dev);

    u16 idetm_data;

    int control = 0;

​

    /*

     *  See Intel Document 298600-004 for the timing programing rules

     *  for PIIX/ICH. Note that the early PIIX does not have the slave

     *  timing port at 0x44. The Radisys is a relative of the PIIX

     *  but not the same so be careful.

     */

​

    static const     /* ISP  RTC */

    u8 timings[][2] = { { 0, 0 },   /* Check me */

                { 0, 0 },

                { 1, 1 },

                { 2, 2 },

                { 3, 3 }, };

​

    if (pio > 0)

        control |= 1;   /* TIME1 enable */

    if (ata_pio_need_iordy(adev))

        control |= 2;   /* IE IORDY */

​

    pci_read_config_word(dev, 0x40, &idetm_data);

​

    /* Enable IE and TIME as appropriate. Clear the other

       drive timing bits */

    idetm_data &= 0xCCCC;

    idetm_data |= (control << (4 * adev->devno));

    idetm_data |= (timings[pio][0] << 12) |

            (timings[pio][1] << 8);

    pci_write_config_word(dev, 0x40, idetm_data);

​

    /* Track which port is configured */

    ap->private_data = adev;

}

​

/**

 *  radisys_set_dmamode - Initialize host controller PATA DMA timings

 *  @ap: Port whose timings we are configuring

 *  @adev: Device to program

 *

 *  Set MWDMA mode for device, in host controller PCI config space.

 *

 *  LOCKING:

 *  None (inherited from caller).

 */

​

static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev)

{

    struct pci_dev *dev = to_pci_dev(ap->host->dev);