linux-imx

/*

 * libata-acpi.c

 * Provides ACPI support for PATA/SATA.

 *

 * Copyright (C) 2006 Intel Corp.

 * Copyright (C) 2006 Randy Dunlap

 */

​

#include <linux/module.h>

#include <linux/ata.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/acpi.h>

#include <linux/libata.h>

#include <linux/pci.h>

#include <linux/slab.h>

#include <linux/pm_runtime.h>

#include <scsi/scsi_device.h>

#include "libata.h"

​

unsigned int ata_acpi_gtf_filter = ATA_ACPI_FILTER_DEFAULT;

module_param_named(acpi_gtf_filter, ata_acpi_gtf_filter, int, 0644);

MODULE_PARM_DESC(acpi_gtf_filter, "filter mask for ACPI _GTF commands, set to filter out (0x1=set xfermode, 0x2=lock/freeze lock, 0x4=DIPM, 0x8=FPDMA non-zero offset, 0x10=FPDMA DMA Setup FIS auto-activate)");

​

#define NO_PORT_MULT        0xffff

#define SATA_ADR(root, pmp) (((root) << 16) | (pmp))

​

#define REGS_PER_GTF        7

struct ata_acpi_gtf {

    u8  tf[REGS_PER_GTF];   /* regs. 0x1f1 - 0x1f7 */

} __packed;

​

static void ata_acpi_clear_gtf(struct ata_device *dev)

{

    kfree(dev->gtf_cache);

    dev->gtf_cache = NULL;

}

​

struct ata_acpi_hotplug_context {

    struct acpi_hotplug_context hp;

    union {

        struct ata_port *ap;

        struct ata_device *dev;

    } data;

};

​

#define ata_hotplug_data(context) (container_of((context), struct ata_acpi_hotplug_context, hp)->data)

​

/**

 * ata_dev_acpi_handle - provide the acpi_handle for an ata_device

 * @dev: the acpi_handle returned will correspond to this device

 *

 * Returns the acpi_handle for the ACPI namespace object corresponding to

 * the ata_device passed into the function, or NULL if no such object exists

 * or ACPI is disabled for this device due to consecutive errors.

 */

acpi_handle ata_dev_acpi_handle(struct ata_device *dev)

{

    return dev->flags & ATA_DFLAG_ACPI_DISABLED ?

            NULL : ACPI_HANDLE(&dev->tdev);

}