Commit 2051e924 authored Jul 07, 2015 by Suthikulpanit, Suravee Committed by Rafael J. Wysocki Jul 07, 2015

ata: ahci_platform: Add ACPI _CLS matching



This patch adds ACPI supports for AHCI platform driver, which uses _CLS
method to match the device.

The following is an example of ASL structure in DSDT for a SATA controller,
which contains _CLS package to be matched by the ahci_platform driver:

  Device (AHC0) // AHCI Controller
  {
    Name(_HID, "AMDI0600")
    Name (_CCA, 1)
    Name (_CLS, Package (3)
    {
      0x01, // Base Class: Mass Storage
      0x06, // Sub-Class: serial ATA
      0x01, // Interface: AHCI
    })
    Name (_CRS, ResourceTemplate ()
    {
      Memory32Fixed (ReadWrite, 0xE0300000, 0x00010000)
      Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive,,,) { 387 }
    })
  }

Also, since ATA driver should not require PCI support for ATA_ACPI,
this patch removes dependency in the driver/ata/Kconfig.

Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 26095a01

drivers/ata/Kconfig

+1 −1

Original line number	Diff line number	Diff line
		@@ -48,7 +48,7 @@ config ATA_VERBOSE_ERROR

		config ATA_ACPI
		bool "ATA ACPI Support"
		depends on ACPI && PCI
		depends on ACPI
		default y
		help
		This option adds support for ATA-related ACPI objects.

drivers/ata/ahci_platform.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,8 @@
		#include <linux/platform_device.h>
		#include <linux/libata.h>
		#include <linux/ahci_platform.h>
		#include <linux/acpi.h>
		#include <linux/pci_ids.h>
		#include "ahci.h"

		#define DRV_NAME "ahci"
		@@ -79,12 +81,19 @@ static const struct of_device_id ahci_of_match[] = {
		};
		MODULE_DEVICE_TABLE(of, ahci_of_match);

		static const struct acpi_device_id ahci_acpi_match[] = {
		{ ACPI_DEVICE_CLASS(PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff) },
		{},
		};
		MODULE_DEVICE_TABLE(acpi, ahci_acpi_match);

		static struct platform_driver ahci_driver = {
		.probe = ahci_probe,
		.remove = ata_platform_remove_one,
		.driver = {
		.name = DRV_NAME,
		.of_match_table = ahci_of_match,
		.acpi_match_table = ahci_acpi_match,
		.pm = &ahci_pm_ops,
		},
		};

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