[PATCH v4 7/8] ata: Add support for the Tegra124 SATA controller

Mikko Perttunen
2014-07-16T11:40:58Z

This adds support for the integrated AHCI-compliant Serial ATA
controller present on the NVIDIA Tegra124 system-on-chip.

Signed-off-by: Mikko Perttunen <mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
v4: init phy in power_on

drivers/ata/Kconfig | 9 ++
drivers/ata/Makefile | 1 +
drivers/ata/ahci_tegra.c | 406 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 416 insertions(+)
create mode 100644 drivers/ata/ahci_tegra.c

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index b0d5b5a..e1b9278 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -142,6 +142,15 @@ config AHCI_SUNXI

If unsure, say N.

+config AHCI_TEGRA
+ tristate "NVIDIA Tegra124 AHCI SATA support"
+ depends on ARCH_TEGRA
+ help
+ This option enables support for the NVIDIA Tegra124 SoC's
+ onboard AHCI SATA.
+
+ If unsure, say N.
+
config AHCI_XGENE
tristate "APM X-Gene 6.0Gbps AHCI SATA host controller support"
depends on PHY_XGENE
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 5a02aee..ae41107 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -15,6 +15,7 @@ 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-$(CONFIG_AHCI_SUNXI) += ahci_sunxi.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_ST) += ahci_st.o libahci.o libahci_platform.o
+obj-$(CONFIG_AHCI_TEGRA) += ahci_tegra.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_XGENE) += ahci_xgene.o libahci.o libahci_platform.o

# SFF w/ custom DMA
diff --git a/drivers/ata/ahci_tegra.c b/drivers/ata/ahci_tegra.c
new file mode 100644
index 0000000..0f59ae4
--- /dev/null
+++ b/drivers/ata/ahci_tegra.c
@@ -0,0 +1,406 @@
+/*
+ * drivers/ata/ahci_tegra.c
+ *
+ * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Author:
+ * Mikko Perttunen <mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/reset.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/tegra-powergate.h>
+#include <linux/regulator/consumer.h>
+#include "ahci.h"
+
+#define SATA_CONFIGURATION_0 0x180
+#define SATA_CONFIGURATION_EN_FPCI BIT(0)
+
+#define SCFG_OFFSET 0x1000
+
+#define T_SATA0_CFG_1 0x04
+#define T_SATA0_CFG_1_IO_SPACE BIT(0)
+#define T_SATA0_CFG_1_MEMORY_SPACE BIT(1)
+#define T_SATA0_CFG_1_BUS_MASTER BIT(2)
+#define T_SATA0_CFG_1_SERR BIT(8)
+
+#define T_SATA0_CFG_9 0x24
+#define T_SATA0_CFG_9_BASE_ADDRESS_SHIFT 13
+
+#define SATA_FPCI_BAR5 0x94
+#define SATA_FPCI_BAR5_START_SHIFT 4
+
+#define SATA_INTR_MASK 0x188
+#define SATA_INTR_MASK_IP_INT_MASK BIT(16)
+
+#define T_SATA0_AHCI_HBA_CAP_BKDR 0x300
+
+#define T_SATA0_BKDOOR_CC 0x4a4
+
+#define T_SATA0_CFG_SATA 0x54c
+#define T_SATA0_CFG_SATA_BACKDOOR_PROG_IF_EN BIT(12)
+
+#define T_SATA0_CFG_MISC 0x550
+
+#define T_SATA0_INDEX 0x680
+
+#define T_SATA0_CHX_PHY_CTRL1_GEN1 0x690
+#define T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_MASK 0xff
+#define T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_SHIFT 0
+#define T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_MASK (0xff << 8)
+#define T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_SHIFT 8
+
+#define T_SATA0_CHX_PHY_CTRL1_GEN2 0x694
+#define T_SATA0_CHX_PHY_CTRL1_GEN2_TX_AMP_MASK 0xff
+#define T_SATA0_CHX_PHY_CTRL1_GEN2_TX_AMP_SHIFT 0
+#define T_SATA0_CHX_PHY_CTRL1_GEN2_TX_PEAK_MASK (0xff << 12)
+#define T_SATA0_CHX_PHY_CTRL1_GEN2_TX_PEAK_SHIFT 12
+
+#define T_SATA0_CHX_PHY_CTRL2 0x69c
+#define T_SATA0_CHX_PHY_CTRL2_CDR_CNTL_GEN1 0x23
+
+#define T_SATA0_CHX_PHY_CTRL11 0x6d0
+#define T_SATA0_CHX_PHY_CTRL11_GEN2_RX_EQ (0x2800 << 16)
+
+#define FUSE_SATA_CALIB 0x124
+#define FUSE_SATA_CALIB_MASK 0x3
+
+enum sata_clks {
+ AHCI_CLK_SATA = 0,
+ AHCI_CLK_SATA_OOB = 1,
+ AHCI_CLK_CML1 = 2,
+ AHCI_CLK_PLL_E = 3
+};
+
+struct sata_pad_calibration {
+ u8 gen1_tx_amp;
+ u8 gen1_tx_peak;
+ u8 gen2_tx_amp;
+ u8 gen2_tx_peak;
+};
+
+static const struct sata_pad_calibration tegra124_pad_calibration[] = {
+ {0x18, 0x04, 0x18, 0x0a},
+ {0x0e, 0x04, 0x14, 0x0a},
+ {0x0e, 0x07, 0x1a, 0x0e},
+ {0x14, 0x0e, 0x1a, 0x0e},
+};
+
+struct tegra_ahci_priv {
+ struct platform_device *pdev;
+ void __iomem *sata_regs;
+ struct reset_control *sata_rst;
+ struct reset_control *sata_oob_rst;
+ struct reset_control *sata_cold_rst;
+ struct regulator_bulk_data supplies[5];
+};
+
+static int tegra_ahci_power_on(struct ahci_host_priv *hpriv)
+{
+ struct tegra_ahci_priv *tegra = hpriv->plat_data;
+ int ret;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(tegra->supplies),
+ tegra->supplies);
+ if (ret)
+ return ret;
+
+ ret = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_SATA,
+ hpriv->clks[AHCI_CLK_SATA],
+ tegra->sata_rst);
+ if (ret)
+ goto disable_regulators;
+
+ reset_control_assert(tegra->sata_oob_rst);
+ reset_control_assert(tegra->sata_cold_rst);
+
+ ret = clk_prepare_enable(hpriv->clks[AHCI_CLK_SATA_OOB]);
+ if (ret)
+ goto disable_power;
+
+ ret = clk_prepare_enable(hpriv->clks[AHCI_CLK_CML1]);
+ if (ret)
+ goto disable_oob;
+
+ ret = clk_prepare_enable(hpriv->clks[AHCI_CLK_PLL_E]);
+ if (ret)
+ goto disable_cml1;
+
+ reset_control_deassert(tegra->sata_cold_rst);
+ reset_control_deassert(tegra->sata_oob_rst);
+
+ ret = phy_init(hpriv->phy);
+ if (ret)
+ goto disable_plle;
+
+ ret = phy_power_on(hpriv->phy);
+ if (ret)
+ goto exit_phy;
+
+ return 0;
+
+exit_phy:
+ phy_exit(hpriv->phy);
+
+disable_plle:
+ clk_disable_unprepare(hpriv->clks[AHCI_CLK_PLL_E]);
+
+disable_cml1:
+ clk_disable_unprepare(hpriv->clks[AHCI_CLK_CML1]);
+
+disable_oob:
+ clk_disable_unprepare(hpriv->clks[AHCI_CLK_SATA_OOB]);
+
+disable_power:
+ clk_disable_unprepare(hpriv->clks[AHCI_CLK_SATA]);
+
+ tegra_powergate_power_off(TEGRA_POWERGATE_SATA);
+
+disable_regulators:
+ regulator_bulk_disable(ARRAY_SIZE(tegra->supplies), tegra->supplies);
+
+ return ret;
+}
+
+static void tegra_ahci_power_off(struct ahci_host_priv *hpriv)
+{
+ struct tegra_ahci_priv *tegra = hpriv->plat_data;
+
+ ahci_platform_disable_resources(hpriv);
+
+ reset_control_assert(tegra->sata_rst);
+ reset_control_assert(tegra->sata_oob_rst);
+ reset_control_assert(tegra->sata_cold_rst);
+
+ tegra_powergate_power_off(TEGRA_POWERGATE_SATA);
+
+ regulator_bulk_disable(ARRAY_SIZE(tegra->supplies), tegra->supplies);
+}
+
+static int tegra_ahci_controller_init(struct ahci_host_priv *hpriv)
+{
+ struct tegra_ahci_priv *tegra = hpriv->plat_data;
+ int ret;
+ unsigned int val;
+ struct sata_pad_calibration calib;
+
+ ret = tegra_ahci_power_on(hpriv);
+ if (ret) {
+ dev_err(&tegra->pdev->dev,
+ "failed to power on AHCI controller: %d\n", ret);
+ return ret;
+ }
+
+ val = readl(tegra->sata_regs + SATA_CONFIGURATION_0);
+ val |= SATA_CONFIGURATION_EN_FPCI;
+ writel(val, tegra->sata_regs + SATA_CONFIGURATION_0);
+
+ /* Pad calibration */
+
+ /* FIXME Always use calibration 0. Change this to read the calibration
+ * fuse once the fuse driver has landed. */
+ val = 0;
+
+ calib = tegra124_pad_calibration[val & FUSE_SATA_CALIB_MASK];
+
+ writel(BIT(0), tegra->sata_regs + SCFG_OFFSET + T_SATA0_INDEX);
+
+ val = readl(tegra->sata_regs +
+ SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL1_GEN1);
+ val &= ~T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_MASK;
+ val &= ~T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_MASK;
+ val |= calib.gen1_tx_amp <<
+ T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_SHIFT;
+ val |= calib.gen1_tx_peak <<
+ T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_SHIFT;
+ writel(val, tegra->sata_regs + SCFG_OFFSET +
+ T_SATA0_CHX_PHY_CTRL1_GEN1);
+
+ val = readl(tegra->sata_regs +
+ SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL1_GEN2);
+ val &= ~T_SATA0_CHX_PHY_CTRL1_GEN2_TX_AMP_MASK;
+ val &= ~T_SATA0_CHX_PHY_CTRL1_GEN2_TX_PEAK_MASK;
+ val |= calib.gen2_tx_amp <<
+ T_SATA0_CHX_PHY_CTRL1_GEN1_TX_AMP_SHIFT;
+ val |= calib.gen2_tx_peak <<
+ T_SATA0_CHX_PHY_CTRL1_GEN1_TX_PEAK_SHIFT;
+ writel(val, tegra->sata_regs + SCFG_OFFSET +
+ T_SATA0_CHX_PHY_CTRL1_GEN2);
+
+ writel(T_SATA0_CHX_PHY_CTRL11_GEN2_RX_EQ,
+ tegra->sata_regs + SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL11);
+ writel(T_SATA0_CHX_PHY_CTRL2_CDR_CNTL_GEN1,
+ tegra->sata_regs + SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL2);
+
+ writel(0, tegra->sata_regs + SCFG_OFFSET + T_SATA0_INDEX);
+
+ /* Program controller device ID */
+
+ val = readl(tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_SATA);
+ val |= T_SATA0_CFG_SATA_BACKDOOR_PROG_IF_EN;
+ writel(val, tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_SATA);
+
+ writel(0x01060100, tegra->sata_regs + SCFG_OFFSET + T_SATA0_BKDOOR_CC);
+
+ val = readl(tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_SATA);
+ val &= ~T_SATA0_CFG_SATA_BACKDOOR_PROG_IF_EN;
+ writel(val, tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_SATA);
+
+ /* Enable IO & memory access, bus master mode */
+
+ val = readl(tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_1);
+ val |= T_SATA0_CFG_1_IO_SPACE | T_SATA0_CFG_1_MEMORY_SPACE |
+ T_SATA0_CFG_1_BUS_MASTER | T_SATA0_CFG_1_SERR;
+ writel(val, tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_1);
+
+ /* Program SATA MMIO */
+
+ writel(0x10000 << SATA_FPCI_BAR5_START_SHIFT,
+ tegra->sata_regs + SATA_FPCI_BAR5);
+
+ writel(0x08000 << T_SATA0_CFG_9_BASE_ADDRESS_SHIFT,
+ tegra->sata_regs + SCFG_OFFSET + T_SATA0_CFG_9);
+
+ /* Unmask SATA interrupts */
+
+ val = readl(tegra->sata_regs + SATA_INTR_MASK);
+ val |= SATA_INTR_MASK_IP_INT_MASK;
+ writel(val, tegra->sata_regs + SATA_INTR_MASK);
+
+ return 0;
+}
+
+static void tegra_ahci_controller_deinit(struct ahci_host_priv *hpriv)
+{
+ tegra_ahci_power_off(hpriv);
+}
+
+static void tegra_ahci_host_stop(struct ata_host *host)
+{
+ struct ahci_host_priv *hpriv = host->private_data;
+
+ tegra_ahci_controller_deinit(hpriv);
+}
+
+static struct ata_port_operations ahci_tegra_port_ops = {
+ .inherits = &ahci_ops,
+ .host_stop = tegra_ahci_host_stop,
+};
+
+static const struct ata_port_info ahci_tegra_port_info = {
+ .flags = AHCI_FLAG_COMMON,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_tegra_port_ops,
+};
+
+static const struct of_device_id tegra_ahci_of_match[] = {
+ { .compatible = "nvidia,tegra124-ahci" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, tegra_ahci_of_match);
+
+static int tegra_ahci_probe(struct platform_device *pdev)
+{
+ struct ahci_host_priv *hpriv;
+ struct tegra_ahci_priv *tegra;
+ struct resource *res;
+ int ret;
+
+ hpriv = ahci_platform_get_resources(pdev);
+ if (IS_ERR(hpriv))
+ return PTR_ERR(hpriv);
+
+ tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
+ if (!tegra)
+ return -ENOMEM;
+
+ hpriv->plat_data = tegra;
+
+ tegra->pdev = pdev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ tegra->sata_regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(tegra->sata_regs))
+ return PTR_ERR(tegra->sata_regs);
+
+ tegra->sata_rst = devm_reset_control_get(&pdev->dev, "sata");
+ if (IS_ERR(tegra->sata_rst)) {
+ dev_err(&pdev->dev, "Failed to get sata reset\n");
+ return PTR_ERR(tegra->sata_rst);
+ }
+
+ tegra->sata_oob_rst = devm_reset_control_get(&pdev->dev, "sata-oob");
+ if (IS_ERR(tegra->sata_oob_rst)) {
+ dev_err(&pdev->dev, "Failed to get sata-oob reset\n");
+ return PTR_ERR(tegra->sata_oob_rst);
+ }
+
+ tegra->sata_cold_rst = devm_reset_control_get(&pdev->dev, "sata-cold");
+ if (IS_ERR(tegra->sata_cold_rst)) {
+ dev_err(&pdev->dev, "Failed to get sata-cold reset\n");
+ return PTR_ERR(tegra->sata_cold_rst);
+ }
+
+ if (!hpriv->clks[AHCI_CLK_PLL_E])
+ return -EPROBE_DEFER;
+
+ tegra->supplies[0].supply = "avdd";
+ tegra->supplies[1].supply = "hvdd";
+ tegra->supplies[2].supply = "vddio";
+ tegra->supplies[3].supply = "target-5v";
+ tegra->supplies[4].supply = "target-12v";
+
+ ret = devm_regulator_bulk_get(&pdev->dev, ARRAY_SIZE(tegra->supplies),
+ tegra->supplies);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to get regulators\n");
+ return ret;
+ }
+
+ ret = tegra_ahci_controller_init(hpriv);
+ if (ret)
+ return ret;
+
+ ret = ahci_platform_init_host(pdev, hpriv, &ahci_tegra_port_info,
+ 0, 0, 0);
+ if (ret)
+ goto deinit_controller;
+
+ return 0;
+
+deinit_controller:
+ tegra_ahci_controller_deinit(hpriv);
+
+ return ret;
+};
+
+static struct platform_driver tegra_ahci_driver = {
+ .probe = tegra_ahci_probe,
+ .remove = ata_platform_remove_one,
+ .driver = {
+ .name = "tegra-ahci",
+ .of_match_table = tegra_ahci_of_match,
+ },
+ /* LP0 suspend support not implemented */
+};
+module_platform_driver(tegra_ahci_driver);
+
+MODULE_AUTHOR("Mikko Perttunen <mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>");
+MODULE_DESCRIPTION("Tegra124 AHCI SATA driver");
+MODULE_LICENSE("GPL v2");
--
1.8.1.5