ARM: EXYNOS4: Add support for SATA on ARMLEX4210

Adds the device definitions, platform specific initialization
and clocks for SATA on ARMLEX4210.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 263 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos4/dev-ahci.c b/arch/arm/mach-exynos4/dev-ahci.c
new file mode 100644
index 000000000000..f57a3de8e1d2
--- /dev/null
+++ b/arch/arm/mach-exynos4/dev-ahci.c
@@ -0,0 +1,263 @@
+/* linux/arch/arm/mach-exynos4/dev-ahci.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * EXYNOS4 - AHCI support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+#include <linux/ahci_platform.h>
+
+#include <plat/cpu.h>
+
+#include <mach/irqs.h>
+#include <mach/map.h>
+#include <mach/regs-pmu.h>
+
+/* PHY Control Register */
+#define SATA_CTRL0              0x0
+/* PHY Link Control Register */
+#define SATA_CTRL1              0x4
+/* PHY Status Register */
+#define SATA_PHY_STATUS         0x8
+
+#define SATA_CTRL0_RX_DATA_VALID(x)     (x << 27)
+#define SATA_CTRL0_SPEED_MODE           (1 << 26)
+#define SATA_CTRL0_M_PHY_CAL            (1 << 19)
+#define SATA_CTRL0_PHY_CMU_RST_N        (1 << 10)
+#define SATA_CTRL0_M_PHY_LN_RST_N       (1 << 9)
+#define SATA_CTRL0_PHY_POR_N            (1 << 8)
+
+#define SATA_CTRL1_RST_PMALIVE_N        (1 << 8)
+#define SATA_CTRL1_RST_RXOOB_N          (1 << 7)
+#define SATA_CTRL1_RST_RX_N             (1 << 6)
+#define SATA_CTRL1_RST_TX_N             (1 << 5)
+
+#define SATA_PHY_STATUS_CMU_OK          (1 << 18)
+#define SATA_PHY_STATUS_LANE_OK         (1 << 16)
+
+#define LANE0           0x200
+#define COM_LANE        0xA00
+
+#define HOST_PORTS_IMPL 0xC
+#define SCLK_SATA_FREQ  (67 * MHZ)
+
+static void __iomem *phy_base, *phy_ctrl;
+
+struct phy_reg {
+        u8      reg;
+        u8      val;
+};
+
+/* SATA PHY setup */
+static const struct phy_reg exynos4_sataphy_cmu[] = {
+        { 0x00, 0x06 }, { 0x02, 0x80 }, { 0x22, 0xa0 }, { 0x23, 0x42 },
+        { 0x2e, 0x04 }, { 0x2f, 0x50 }, { 0x30, 0x70 }, { 0x31, 0x02 },
+        { 0x32, 0x25 }, { 0x33, 0x40 }, { 0x34, 0x01 }, { 0x35, 0x40 },
+        { 0x61, 0x2e }, { 0x63, 0x5e }, { 0x65, 0x42 }, { 0x66, 0xd1 },
+        { 0x67, 0x20 }, { 0x68, 0x28 }, { 0x69, 0x78 }, { 0x6a, 0x04 },
+        { 0x6b, 0xc8 }, { 0x6c, 0x06 },
+};
+
+static const struct phy_reg exynos4_sataphy_lane[] = {
+        { 0x00, 0x02 }, { 0x05, 0x10 }, { 0x06, 0x84 }, { 0x07, 0x04 },
+        { 0x08, 0xe0 }, { 0x10, 0x23 }, { 0x13, 0x05 }, { 0x14, 0x30 },
+        { 0x15, 0x00 }, { 0x17, 0x70 }, { 0x18, 0xf2 }, { 0x19, 0x1e },
+        { 0x1a, 0x18 }, { 0x1b, 0x0d }, { 0x1c, 0x08 }, { 0x50, 0x60 },
+        { 0x51, 0x0f },
+};
+
+static const struct phy_reg exynos4_sataphy_comlane[] = {
+        { 0x01, 0x20 }, { 0x03, 0x40 }, { 0x04, 0x3c }, { 0x05, 0x7d },
+        { 0x06, 0x1d }, { 0x07, 0xcf }, { 0x08, 0x05 }, { 0x09, 0x63 },
+        { 0x0a, 0x29 }, { 0x0b, 0xc4 }, { 0x0c, 0x01 }, { 0x0d, 0x03 },
+        { 0x0e, 0x28 }, { 0x0f, 0x98 }, { 0x10, 0x19 }, { 0x13, 0x80 },
+        { 0x14, 0xf0 }, { 0x15, 0xd0 }, { 0x39, 0xa0 }, { 0x3a, 0xa0 },
+        { 0x3b, 0xa0 }, { 0x3c, 0xa0 }, { 0x3d, 0xa0 }, { 0x3e, 0xa0 },
+        { 0x3f, 0xa0 }, { 0x40, 0x42 }, { 0x42, 0x80 }, { 0x43, 0x58 },
+        { 0x45, 0x44 }, { 0x46, 0x5c }, { 0x47, 0x86 }, { 0x48, 0x8d },
+        { 0x49, 0xd0 }, { 0x4a, 0x09 }, { 0x4b, 0x90 }, { 0x4c, 0x07 },
+        { 0x4d, 0x40 }, { 0x51, 0x20 }, { 0x52, 0x32 }, { 0x7f, 0xd8 },
+        { 0x80, 0x1a }, { 0x81, 0xff }, { 0x82, 0x11 }, { 0x83, 0x00 },
+        { 0x87, 0xf0 }, { 0x87, 0xff }, { 0x87, 0xff }, { 0x87, 0xff },
+        { 0x87, 0xff }, { 0x8c, 0x1c }, { 0x8d, 0xc2 }, { 0x8e, 0xc3 },
+        { 0x8f, 0x3f }, { 0x90, 0x0a }, { 0x96, 0xf8 },
+};
+
+static int wait_for_phy_ready(void __iomem *reg, unsigned long bit)
+{
+        unsigned long timeout;
+
+        /* wait for maximum of 3 sec */
+        timeout = jiffies + msecs_to_jiffies(3000);
+        while (!(__raw_readl(reg) & bit)) {
+                if (time_after(jiffies, timeout))
+                        return -1;
+                cpu_relax();
+        }
+        return 0;
+}
+
+static int ahci_phy_init(void __iomem *mmio)
+{
+        int i, ctrl0;
+
+        for (i = 0; i < ARRAY_SIZE(exynos4_sataphy_cmu); i++)
+                __raw_writeb(exynos4_sataphy_cmu[i].val,
+                phy_base + (exynos4_sataphy_cmu[i].reg * 4));
+
+        for (i = 0; i < ARRAY_SIZE(exynos4_sataphy_lane); i++)
+                __raw_writeb(exynos4_sataphy_lane[i].val,
+                phy_base + (LANE0 + exynos4_sataphy_lane[i].reg) * 4);
+
+        for (i = 0; i < ARRAY_SIZE(exynos4_sataphy_comlane); i++)
+                __raw_writeb(exynos4_sataphy_comlane[i].val,
+                phy_base + (COM_LANE + exynos4_sataphy_comlane[i].reg) * 4);
+
+        __raw_writeb(0x07, phy_base);
+
+        ctrl0 = __raw_readl(phy_ctrl + SATA_CTRL0);
+        ctrl0 |= SATA_CTRL0_PHY_CMU_RST_N;
+        __raw_writel(ctrl0, phy_ctrl + SATA_CTRL0);
+
+        if (wait_for_phy_ready(phy_ctrl + SATA_PHY_STATUS,
+                                SATA_PHY_STATUS_CMU_OK) < 0) {
+                printk(KERN_ERR "PHY CMU not ready\n");
+                return -EBUSY;
+        }
+
+        __raw_writeb(0x03, phy_base + (COM_LANE * 4));
+
+        ctrl0 = __raw_readl(phy_ctrl + SATA_CTRL0);
+        ctrl0 |= SATA_CTRL0_M_PHY_LN_RST_N;
+        __raw_writel(ctrl0, phy_ctrl + SATA_CTRL0);
+
+        if (wait_for_phy_ready(phy_ctrl + SATA_PHY_STATUS,
+                                SATA_PHY_STATUS_LANE_OK) < 0) {
+                printk(KERN_ERR "PHY LANE not ready\n");
+                return -EBUSY;
+        }
+
+        ctrl0 = __raw_readl(phy_ctrl + SATA_CTRL0);
+        ctrl0 |= SATA_CTRL0_M_PHY_CAL;
+        __raw_writel(ctrl0, phy_ctrl + SATA_CTRL0);
+
+        return 0;
+}
+
+static int exynos4_ahci_init(struct device *dev, void __iomem *mmio)
+{
+        struct clk *clk_sata, *clk_sataphy, *clk_sclk_sata;
+        int val, ret;
+
+        phy_base = ioremap(EXYNOS4_PA_SATAPHY, SZ_64K);
+        if (!phy_base) {
+                dev_err(dev, "failed to allocate memory for SATA PHY\n");
+                return -ENOMEM;
+        }
+
+        phy_ctrl = ioremap(EXYNOS4_PA_SATAPHY_CTRL, SZ_16);
+        if (!phy_ctrl) {
+                dev_err(dev, "failed to allocate memory for SATA PHY CTRL\n");
+                ret = -ENOMEM;
+                goto err1;
+        }
+
+        clk_sata = clk_get(dev, "sata");
+        if (IS_ERR(clk_sata)) {
+                dev_err(dev, "failed to get sata clock\n");
+                ret = PTR_ERR(clk_sata);
+                clk_sata = NULL;
+                goto err2;
+
+        }
+        clk_enable(clk_sata);
+
+        clk_sataphy = clk_get(dev, "sataphy");
+        if (IS_ERR(clk_sataphy)) {
+                dev_err(dev, "failed to get sataphy clock\n");
+                ret = PTR_ERR(clk_sataphy);
+                clk_sataphy = NULL;
+                goto err3;
+        }
+        clk_enable(clk_sataphy);
+
+        clk_sclk_sata = clk_get(dev, "sclk_sata");
+        if (IS_ERR(clk_sclk_sata)) {
+                dev_err(dev, "failed to get sclk_sata\n");
+                ret = PTR_ERR(clk_sclk_sata);
+                clk_sclk_sata = NULL;
+                goto err4;
+        }
+        clk_enable(clk_sclk_sata);
+        clk_set_rate(clk_sclk_sata, SCLK_SATA_FREQ);
+
+        __raw_writel(S5P_PMU_SATA_PHY_CONTROL_EN, S5P_PMU_SATA_PHY_CONTROL);
+
+        /* Enable PHY link control */
+        val = SATA_CTRL1_RST_PMALIVE_N | SATA_CTRL1_RST_RXOOB_N |
+                        SATA_CTRL1_RST_RX_N | SATA_CTRL1_RST_TX_N;
+        __raw_writel(val, phy_ctrl + SATA_CTRL1);
+
+        /* Set communication speed as 3Gbps and enable PHY power */
+        val = SATA_CTRL0_RX_DATA_VALID(3) | SATA_CTRL0_SPEED_MODE |
+                        SATA_CTRL0_PHY_POR_N;
+        __raw_writel(val, phy_ctrl + SATA_CTRL0);
+
+        /* Port0 is available */
+        __raw_writel(0x1, mmio + HOST_PORTS_IMPL);
+
+        return ahci_phy_init(mmio);
+
+err4:
+        clk_disable(clk_sataphy);
+        clk_put(clk_sataphy);
+err3:
+        clk_disable(clk_sata);
+        clk_put(clk_sata);
+err2:
+        iounmap(phy_ctrl);
+err1:
+        iounmap(phy_base);
+
+        return ret;
+}
+
+static struct ahci_platform_data exynos4_ahci_pdata = {
+        .init = exynos4_ahci_init,
+};
+
+static struct resource exynos4_ahci_resource[] = {
+        [0] = {
+                .start  = EXYNOS4_PA_SATA,
+                .end    = EXYNOS4_PA_SATA + SZ_64K - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+        [1] = {
+                .start  = IRQ_SATA,
+                .end    = IRQ_SATA,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static u64 exynos4_ahci_dmamask = DMA_BIT_MASK(32);
+
+struct platform_device exynos4_device_ahci = {
+        .name           = "ahci",
+        .id             = -1,
+        .resource       = exynos4_ahci_resource,
+        .num_resources  = ARRAY_SIZE(exynos4_ahci_resource),
+        .dev            = {
+                .platform_data          = &exynos4_ahci_pdata,
+                .dma_mask               = &exynos4_ahci_dmamask,
+                .coherent_dma_mask      = DMA_BIT_MASK(32),
+        },
+};