linux-kernel - [PATCH 1/4] ata: ahci_platform: Add ACPI support for AMD Seattle SATA controller

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Date:	Mon, 15 Sep 2014 19:47:23 -0500
From:	<suravee.suthikulpanit@....com>
To:	<catalin.marinas@....com>, <will.deacon@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-apci@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>, <astone@...hat.com>,
	<hanjun.guo@...aro.org>, <rjw@...ysocki.net>,
	<marc.zyngier@....com>, <mark.rutland@....com>,
	<Sudeep.Holla@....com>, <olof@...om.net>,
	<grant.likely@...aro.org>, <graeme.gregory@...aro.org>,
	<arnd@...db.de>, <jason@...edaemon.net>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: [PATCH 1/4] ata: ahci_platform: Add ACPI support for AMD Seattle SATA controller

From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>

This patch adds ACPI match table in ahci_platform. The table includes
the acpi_device_id to match AMD Seattle SATA controller with following
asl structure in DSDT:

    Device (SATA0)
    {
      Name(_HID, "AMDI0600")	// Seattle AHSATA
      Name (_CCA, 1)		// Cache-coherent controller
      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.
---
 drivers/ata/Kconfig         |  2 +-
 drivers/ata/ahci_platform.c | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index e1b9278..f2e6c9e 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -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.
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index f61ddb9..3499bab 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -20,6 +20,9 @@
 #include <linux/platform_device.h>
 #include <linux/libata.h>
 #include <linux/ahci_platform.h>
+#ifdef CONFIG_ATA_ACPI
+#include <linux/acpi.h>
+#endif
 #include "ahci.h"
 
 static const struct ata_port_info ahci_port_info = {
@@ -87,6 +90,13 @@ static const struct of_device_id ahci_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, ahci_of_match);
 
+#ifdef CONFIG_ATA_ACPI
+static const struct acpi_device_id ahci_acpi_match[] = {
+	{ "AMDI0600", 0 }, /* AMD Seattle AHCI */
+	{ },
+};
+#endif
+
 static struct platform_driver ahci_driver = {
 	.probe = ahci_probe,
 	.remove = ata_platform_remove_one,
@@ -94,6 +104,9 @@ static struct platform_driver ahci_driver = {
 		.name = "ahci",
 		.owner = THIS_MODULE,
 		.of_match_table = ahci_of_match,
+#ifdef CONFIG_ATA_ACPI
+		.acpi_match_table = ACPI_PTR(ahci_acpi_match),
+#endif
 		.pm = &ahci_pm_ops,
 	},
 };
-- 
1.9.3

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