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>

diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
index c2340ee..3d84dca 100644 (file)
--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -11,6 +11,7 @@ Required properties:
 - compatible        : compatible string, one of:
   - "allwinner,sun4i-a10-ahci"
   - "hisilicon,hisi-ahci"
+  - "cavium,octeon-7130-ahci"
   - "ibm,476gtr-ahci"
   - "marvell,armada-380-ahci"
   - "snps,dwc-ahci"

diff --git a/Documentation/devicetree/bindings/mips/cavium/sata-uctl.txt b/Documentation/devicetree/bindings/mips/cavium/sata-uctl.txt
new file mode 100644 (file)
index 0000000..3bd3c2f
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/cavium/sata-uctl.txt
@@ -0,0 +1,42 @@
+* UCTL SATA controller glue
+
+UCTL is the bridge unit between the I/O interconnect (an internal bus)
+and the SATA AHCI host controller (UAHC). It performs the following functions:
+       - provides interfaces for the applications to access the UAHC AHCI
+         registers on the CN71XX I/O space.
+       - provides a bridge for UAHC to fetch AHCI command table entries and data
+         buffers from Level 2 Cache.
+       - posts interrupts to the CIU.
+       - contains registers that:
+               - control the behavior of the UAHC
+               - control the clock/reset generation to UAHC
+               - control endian swapping for all UAHC registers and DMA accesses
+
+Properties:
+
+- compatible: "cavium,octeon-7130-sata-uctl"
+
+  Compatibility with the cn7130 SOC.
+
+- reg: The base address of the UCTL register bank.
+
+- #address-cells, #size-cells, ranges and dma-ranges must be present and hold
+       suitable values to map all child nodes.
+
+Example:
+
+       uctl@118006c000000 {
+               compatible = "cavium,octeon-7130-sata-uctl";
+               reg = <0x11800 0x6c000000 0x0 0x100>;
+               ranges; /* Direct mapping */
+               dma-ranges;
+               #address-cells = <2>;
+               #size-cells = <2>;
+
+               sata: sata@16c0000000000 {
+                       compatible = "cavium,octeon-7130-ahci";
+                       reg = <0x16c00 0x00000000 0x0 0x200>;
+                       interrupt-parent = <&cibsata>;
+                       interrupts = <2 4>; /* Bit: 2, level */
+               };
+       };

diff --git a/arch/mips/include/asm/octeon/cvmx.h b/arch/mips/include/asm/octeon/cvmx.h
index 774bb45..19e139c 100644 (file)
--- a/arch/mips/include/asm/octeon/cvmx.h
+++ b/arch/mips/include/asm/octeon/cvmx.h
@@ -275,6 +275,11 @@ static inline void cvmx_write_csr(uint64_t csr_addr, uint64_t val)
                cvmx_read64(CVMX_MIO_BOOT_BIST_STAT);
 }
 
+static inline void cvmx_writeq_csr(void __iomem *csr_addr, uint64_t val)
+{
+       cvmx_write_csr((__force uint64_t)csr_addr, val);
+}
+
 static inline void cvmx_write_io(uint64_t io_addr, uint64_t val)
 {
        cvmx_write64(io_addr, val);
@@ -287,6 +292,10 @@ static inline uint64_t cvmx_read_csr(uint64_t csr_addr)
        return val;
 }
 
+static inline uint64_t cvmx_readq_csr(void __iomem *csr_addr)
+{
+       return cvmx_read_csr((__force uint64_t) csr_addr);
+}
 
 static inline void cvmx_send_single(uint64_t data)
 {

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 861643e..9c15828 100644 (file)
--- 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 af45eff..1857952 100644 (file)
--- 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 (file)
index 0000000..ea865fe
--- /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 04975b8..4044233 100644 (file)
--- 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);