[PATCH 3/5] ata: add Broadcom AHCI SATA3 driver for STB chips

[Brian Norris <computersforpeace@gmail.com>]

Pretty straightforward driver, using the nice library-ization of the
generic ahci_platform driver.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
 drivers/ata/Kconfig        |   9 +++
 drivers/ata/Makefile       |   1 +
 drivers/ata/sata_brcmstb.c | 148 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 158 insertions(+)
 create mode 100644 drivers/ata/sata_brcmstb.c

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 5f601553b9b0..33d4b3031705 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -98,6 +98,15 @@ config SATA_AHCI_PLATFORM
 
 	  If unsure, say N.
 
+config SATA_BRCMSTB
+	tristate "Broadcom STB AHCI SATA support"
+	depends on ARCH_BRCMSTB
+	help
+	  This option enables support for the AHCI SATA3 controller found on
+	  STB SoC's.
+
+	  If unsure, say N.
+
 config AHCI_DA850
 	tristate "DaVinci DA850 AHCI SATA support"
 	depends on ARCH_DAVINCI_DA850
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index ae41107afc1f..5d1e6a96bc93 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_ATA)		+= libata.o
 obj-$(CONFIG_SATA_AHCI)		+= ahci.o libahci.o
 obj-$(CONFIG_SATA_ACARD_AHCI)	+= acard-ahci.o libahci.o
 obj-$(CONFIG_SATA_AHCI_PLATFORM) += ahci_platform.o libahci.o libahci_platform.o
+obj-$(CONFIG_SATA_BRCMSTB)	+= sata_brcmstb.o libahci.o libahci_platform.o
 obj-$(CONFIG_SATA_FSL)		+= sata_fsl.o
 obj-$(CONFIG_SATA_INIC162X)	+= sata_inic162x.o
 obj-$(CONFIG_SATA_SIL24)	+= sata_sil24.o
diff --git a/drivers/ata/sata_brcmstb.c b/drivers/ata/sata_brcmstb.c
new file mode 100644
index 000000000000..2a3aff419332
--- /dev/null
+++ b/drivers/ata/sata_brcmstb.c
@@ -0,0 +1,148 @@
+/*
+ * Broadcom SATA3 AHCI Controller Driver
+ *
+ * Copyright © 2009-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * 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/ahci_platform.h>
+#include <linux/compiler.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/libata.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+
+#include "ahci.h"
+
+#define DRV_NAME			"brcm-ahci"
+
+#define SATA_TOP_CTRL_VERSION		0x0
+#define SATA_TOP_CTRL_BUS_CTRL		0x4
+
+#ifdef __BIG_ENDIAN
+#define DATA_ENDIAN			 2 /* AHCI->DDR inbound accesses */
+#define MMIO_ENDIAN			 2 /* CPU->AHCI outbound accesses */
+#else
+#define DATA_ENDIAN			 0
+#define MMIO_ENDIAN			 0
+#endif
+
+struct brcm_ahci_priv {
+	struct device *dev;
+	struct ahci_host_priv *hpriv;
+
+	void __iomem *top_ctrl;
+};
+
+static const struct ata_port_info ahci_brcm_port_info = {
+	.flags		= AHCI_FLAG_COMMON,
+	.pio_mask	= ATA_PIO4,
+	.udma_mask	= ATA_UDMA6,
+	.port_ops	= &ahci_platform_ops,
+};
+
+static void brcm_sata3_init_config(struct brcm_ahci_priv *priv)
+{
+	/* Configure endianness */
+	writel((DATA_ENDIAN << 4) | (DATA_ENDIAN << 2) | (MMIO_ENDIAN << 0),
+		priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL);
+}
+
+static int brcm_ahci_suspend(struct device *dev)
+{
+	return ahci_platform_suspend(dev);
+}
+
+static int brcm_ahci_resume(struct device *dev)
+{
+	struct brcm_ahci_priv *priv = dev_get_drvdata(dev);
+
+	brcm_sata3_init_config(priv);
+	return ahci_platform_resume(dev);
+}
+
+static struct scsi_host_template ahci_platform_sht = {
+	AHCI_SHT(DRV_NAME),
+};
+
+static int brcm_ahci_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct brcm_ahci_priv *priv;
+	struct ahci_host_priv *hpriv;
+	struct resource *res;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+	dev_set_drvdata(dev, priv);
+	priv->dev = dev;
+
+	hpriv = ahci_platform_get_resources(pdev);
+	if (IS_ERR(hpriv))
+		return PTR_ERR(hpriv);
+
+	priv->hpriv = hpriv;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "top-ctrl");
+	priv->top_ctrl = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->top_ctrl))
+		return PTR_ERR(priv->top_ctrl);
+
+	brcm_sata3_init_config(priv);
+
+	ret = ahci_platform_enable_resources(hpriv);
+	if (ret)
+		return ret;
+
+	hpriv->plat_data = priv;
+
+	ret = ahci_platform_init_host(pdev, hpriv, &ahci_brcm_port_info,
+				      &ahci_platform_sht);
+	if (ret)
+		return ret;
+
+	dev_info(dev, "Broadcom AHCI SATA3 registered\n");
+
+	return 0;
+}
+
+static const struct of_device_id ahci_of_match[] = {
+	{.compatible = "brcm,sata3-ahci"},
+	{},
+};
+MODULE_DEVICE_TABLE(of, ahci_of_match);
+
+static SIMPLE_DEV_PM_OPS(ahci_brcm_pm_ops, brcm_ahci_suspend, brcm_ahci_resume);
+
+static struct platform_driver brcm_ahci_driver = {
+	.probe = brcm_ahci_probe,
+	.remove = ata_platform_remove_one,
+	.driver = {
+		.name = DRV_NAME,
+		.of_match_table = ahci_of_match,
+		.pm = &ahci_brcm_pm_ops,
+	},
+};
+module_platform_driver(brcm_ahci_driver);
+
+MODULE_DESCRIPTION("Broadcom SATA3 AHCI Controller Driver");
+MODULE_AUTHOR("Brian Norris");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sata-brcmstb");
-- 
1.9.1