libata: support AHCI on OCTEON platform

The OCTEON SATA controller is currently found on cn71XX devices.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Vinita Gupta <vgupta@caviumnetworks.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

4 files changed, 116 insertions, 0 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 861643ea91b5..9c15828195df 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -151,6 +151,15 @@ config AHCI_MVEBU
 
 	  If unsure, say N.
 
+config AHCI_OCTEON
+	tristate "Cavium Octeon Soc Serial ATA"
+	depends on SATA_AHCI_PLATFORM && CAVIUM_OCTEON_SOC
+	default y
+	help
+	  This option enables support for Cavium Octeon SoC Serial ATA.
+
+	  If unsure, say N.
+
 config AHCI_SUNXI
 	tristate "Allwinner sunxi AHCI SATA support"
 	depends on ARCH_SUNXI
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index af45effac18c..18579521464e 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_AHCI_CEVA)		+= ahci_ceva.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_DA850)	+= ahci_da850.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_IMX)		+= ahci_imx.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_MVEBU)	+= ahci_mvebu.o libahci.o libahci_platform.o
+obj-$(CONFIG_AHCI_OCTEON)	+= ahci_octeon.o
 obj-$(CONFIG_AHCI_SUNXI)	+= ahci_sunxi.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_ST)		+= ahci_st.o libahci.o libahci_platform.o
 obj-$(CONFIG_AHCI_TEGRA)	+= ahci_tegra.o libahci.o libahci_platform.o
diff --git a/drivers/ata/ahci_octeon.c b/drivers/ata/ahci_octeon.c
new file mode 100644
index 000000000000..ea865fe953e1
--- /dev/null
+++ b/drivers/ata/ahci_octeon.c
@@ -0,0 +1,105 @@
+/*
+ * SATA glue for Cavium Octeon III SOCs.
+ *
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2010-2015 Cavium Networks
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+
+#include <asm/octeon/octeon.h>
+#include <asm/bitfield.h>
+
+#define CVMX_SATA_UCTL_SHIM_CFG		0xE8
+
+#define SATA_UCTL_ENDIAN_MODE_BIG	1
+#define SATA_UCTL_ENDIAN_MODE_LITTLE	0
+#define SATA_UCTL_ENDIAN_MODE_MASK	3
+
+#define SATA_UCTL_DMA_ENDIAN_MODE_SHIFT	8
+#define SATA_UCTL_CSR_ENDIAN_MODE_SHIFT	0
+#define SATA_UCTL_DMA_READ_CMD_SHIFT	12
+
+static int ahci_octeon_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node;
+	struct resource *res;
+	void __iomem *base;
+	u64 cfg;
+	int ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "Platform resource[0] is missing\n");
+		return -ENODEV;
+	}
+
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	cfg = cvmx_readq_csr(base + CVMX_SATA_UCTL_SHIM_CFG);
+
+	cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT);
+	cfg &= ~(SATA_UCTL_ENDIAN_MODE_MASK << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT);
+
+#ifdef __BIG_ENDIAN
+	cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
+	cfg |= SATA_UCTL_ENDIAN_MODE_BIG << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
+#else
+	cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_DMA_ENDIAN_MODE_SHIFT;
+	cfg |= SATA_UCTL_ENDIAN_MODE_LITTLE << SATA_UCTL_CSR_ENDIAN_MODE_SHIFT;
+#endif
+
+	cfg |= 1 << SATA_UCTL_DMA_READ_CMD_SHIFT;
+
+	cvmx_writeq_csr(base + CVMX_SATA_UCTL_SHIM_CFG, cfg);
+
+	if (!node) {
+		dev_err(dev, "no device node, failed to add octeon sata\n");
+		return -ENODEV;
+	}
+
+	ret = of_platform_populate(node, NULL, NULL, dev);
+	if (ret) {
+		dev_err(dev, "failed to add ahci-platform core\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ahci_octeon_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static const struct of_device_id octeon_ahci_match[] = {
+	{ .compatible = "cavium,octeon-7130-sata-uctl", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, octeon_ahci_match);
+
+static struct platform_driver ahci_octeon_driver = {
+	.probe          = ahci_octeon_probe,
+	.remove         = ahci_octeon_remove,
+	.driver         = {
+		.name   = "octeon-ahci",
+		.of_match_table = octeon_ahci_match,
+	},
+};
+
+module_platform_driver(ahci_octeon_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Cavium, Inc. <support@cavium.com>");
+MODULE_DESCRIPTION("Cavium Inc. sata config.");
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 04975b851c23..40442332bfa7 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -76,6 +76,7 @@ static const struct of_device_id ahci_of_match[] = {
 	{ .compatible = "ibm,476gtr-ahci", },
 	{ .compatible = "snps,dwc-ahci", },
 	{ .compatible = "hisilicon,hisi-ahci", },
+	{ .compatible = "cavium,octeon-7130-ahci", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, ahci_of_match);