From c5ea64dcf7b5d45e402e78b9f291d521669b7b80 Mon Sep 17 00:00:00 2001
From: Kumar Gala <galak@codeaurora.org>
Date: Fri, 30 May 2014 15:35:40 -0500
Subject: [PATCH 142/182] ata: Add Qualcomm ARM SoC AHCI SATA host controller
 driver

Add support for the Qualcomm AHCI SATA controller that exists on several
SoC and specifically the IPQ806x family of chips.  The IPQ806x SATA support
requires the associated IPQ806x SATA PHY Driver to be enabled as well.

Signed-off-by: Kumar Gala <galak@codeaurora.org>
---
 drivers/ata/Kconfig     |   10 ++++++
 drivers/ata/Makefile    |    1 +
 drivers/ata/ahci_qcom.c |   86 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 97 insertions(+)
 create mode 100644 drivers/ata/ahci_qcom.c

--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -106,6 +106,16 @@ config AHCI_IMX
 
 	  If unsure, say N.
 
+config AHCI_QCOM
+	tristate "Qualcomm AHCI SATA support"
+	depends on ARCH_QCOM
+	help
+	  This option enables support for AHCI SATA controller
+	  integrated into Qualcomm ARM SoC chipsets. For more
+	  information please refer to http://www.qualcomm.com/chipsets.
+
+	  If unsure, say N.
+
 config SATA_FSL
 	tristate "Freescale 3.0Gbps SATA support"
 	depends on FSL_SOC
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_SATA_SIL24)	+= sata_sil24.o
 obj-$(CONFIG_SATA_DWC)		+= sata_dwc_460ex.o
 obj-$(CONFIG_SATA_HIGHBANK)	+= sata_highbank.o libahci.o
 obj-$(CONFIG_AHCI_IMX)		+= ahci_imx.o libahci.o libahci_platform.o
+obj-$(CONFIG_AHCI_QCOM)		+= ahci_qcom.o libahci.o libahci_platform.o
 
 # SFF w/ custom DMA
 obj-$(CONFIG_PDC_ADMA)		+= pdc_adma.o
--- /dev/null
+++ b/drivers/ata/ahci_qcom.c
@@ -0,0 +1,86 @@
+/*
+ * Qualcomm ARM SoC AHCI SATA platform driver
+ *
+ * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
+ *
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/libata.h>
+#include <linux/ahci_platform.h>
+#include "ahci.h"
+
+static const struct ata_port_info qcom_ahci_port_info = {
+	.flags		= AHCI_FLAG_COMMON,
+	.pio_mask	= ATA_PIO4,
+	.udma_mask	= ATA_UDMA6,
+	.port_ops	= &ahci_platform_ops,
+};
+
+static int qcom_ahci_probe(struct platform_device *pdev)
+{
+	struct ahci_host_priv *hpriv;
+	struct clk *rxoob_clk;
+	int rc;
+
+	hpriv = ahci_platform_get_resources(pdev);
+	if (IS_ERR(hpriv))
+		return PTR_ERR(hpriv);
+
+	/* Try and set the rxoob clk to 100Mhz */
+	rxoob_clk = of_clk_get_by_name(pdev->dev.of_node, "rxoob");
+	if (IS_ERR(rxoob_clk))
+		return PTR_ERR(rxoob_clk);
+
+	rc = clk_set_rate(rxoob_clk, 100000000);
+	if (rc)
+		return rc;
+
+	rc = ahci_platform_enable_resources(hpriv);
+	if (rc)
+		return rc;
+
+	rc = ahci_platform_init_host(pdev, hpriv, &qcom_ahci_port_info, 0, 0);
+	if (rc)
+		goto disable_resources;
+
+	return 0;
+disable_resources:
+	ahci_platform_disable_resources(hpriv);
+	return rc;
+}
+
+static const struct of_device_id qcom_ahci_of_match[] = {
+	{ .compatible = "qcom,msm-ahci", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, qcom_ahci_of_match);
+
+static struct platform_driver qcom_ahci_driver = {
+	.probe = qcom_ahci_probe,
+	.remove = ata_platform_remove_one,
+	.driver = {
+		.name = "qcom_ahci_qcom",
+		.owner = THIS_MODULE,
+		.of_match_table = qcom_ahci_of_match,
+	},
+};
+module_platform_driver(qcom_ahci_driver);
+
+MODULE_DESCRIPTION("Qualcomm AHCI SATA platform driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("ahci:qcom");