[PATCH 8/9] ata: Add support for the Tegra124 SATA controller

[Mikko Perttunen]

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@xxxxxxxxxx>
---
 drivers/ata/Kconfig      |   9 ++
 drivers/ata/Makefile     |   1 +
 drivers/ata/ahci_tegra.c | 386 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 396 insertions(+)
 create mode 100644 drivers/ata/ahci_tegra.c

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 7671dba..e65d400 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -141,6 +141,15 @@ 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..a10aac0
--- /dev/null
+++ b/drivers/ata/ahci_tegra.c
@@ -0,0 +1,386 @@
+/*
+ * drivers/ata/ahci_tegra.c
+ *
+ * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Author:
+ *	Mikko Perttunen <mperttunen@xxxxxxxxxx>
+ *
+ * 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 <linux/tegra-soc.h>
+#include "ahci.h"
+
+#define SATA_CONFIGURATION_0				0x180
+#define		SATA_CONFIGURATION_EN_FPCI		(1<<0)
+
+#define SCFG_OFFSET					0x1000
+
+#define T_SATA0_CFG_1					0x04
+#define		T_SATA0_CFG_1_IO_SPACE			(1<<0)
+#define		T_SATA0_CFG_1_MEMORY_SPACE		(1<<1)
+#define		T_SATA0_CFG_1_BUS_MASTER		(1<<2)
+#define		T_SATA0_CFG_1_SERR			(1<<8)
+
+#define T_SATA0_CFG_9					0x24
+
+#define SATA_FPCI_BAR5					0x94
+
+#define SATA_INTR_MASK					0x188
+#define		SATA_INTR_MASK_IP_INT_MASK		(1<<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	(1<<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)
+
+struct sata_pad_calibration {
+	u8 gen1_tx_amp, gen1_tx_peak, gen2_tx_amp, 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[3];
+};
+
+static inline void sata_writel(struct tegra_ahci_priv *tegra, u32 value,
+				 unsigned long offset)
+{
+	writel(value, tegra->sata_regs + offset);
+}
+
+static inline u32 sata_readl(struct tegra_ahci_priv *tegra,
+				unsigned long offset)
+{
+	return readl(tegra->sata_regs + offset);
+}
+
+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;
+
+	reset_control_assert(tegra->sata_rst);
+	reset_control_assert(tegra->sata_oob_rst);
+	reset_control_assert(tegra->sata_cold_rst);
+
+	ret = tegra_powergate_power_on(TEGRA_POWERGATE_SATA);
+	if (ret)
+		goto reset_deassert;
+
+	/* Enable clocks */
+	ret = ahci_platform_enable_resources(hpriv);
+	if (ret)
+		goto power_off;
+
+	udelay(10);
+
+	ret = tegra_powergate_remove_clamping(TEGRA_POWERGATE_SATA);
+	if (ret)
+		goto disable_resources;
+
+	udelay(10);
+
+	reset_control_deassert(tegra->sata_cold_rst);
+	reset_control_deassert(tegra->sata_oob_rst);
+	reset_control_deassert(tegra->sata_rst);
+
+	return 0;
+
+disable_resources:
+	ahci_platform_disable_resources(hpriv);
+
+power_off:
+	tegra_powergate_power_off(TEGRA_POWERGATE_SATA);
+
+reset_deassert:
+	reset_control_deassert(tegra->sata_cold_rst);
+	reset_control_deassert(tegra->sata_oob_rst);
+	reset_control_deassert(tegra->sata_rst);
+
+	return ret;
+}
+
+static void tegra_ahci_power_off(struct ahci_host_priv *hpriv)
+{
+	struct tegra_ahci_priv *tegra = hpriv->plat_data;
+
+	reset_control_assert(tegra->sata_rst);
+	reset_control_assert(tegra->sata_oob_rst);
+	reset_control_assert(tegra->sata_cold_rst);
+
+	ahci_platform_disable_resources(hpriv);
+
+	tegra_powergate_power_off(TEGRA_POWERGATE_SATA);
+
+	reset_control_deassert(tegra->sata_cold_rst);
+	reset_control_deassert(tegra->sata_oob_rst);
+	reset_control_deassert(tegra->sata_rst);
+
+	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 = sata_readl(tegra, SATA_CONFIGURATION_0);
+	val |= SATA_CONFIGURATION_EN_FPCI;
+	sata_writel(tegra, val, SATA_CONFIGURATION_0);
+
+	/* Pad calibration */
+
+	ret = tegra_fuse_readl(0x224, &val);
+	if (ret) {
+		dev_err(&tegra->pdev->dev,
+			"failed to read sata calibration fuse: %d\n", ret);
+		return ret;
+	}
+
+	calib = tegra124_pad_calibration[val];
+
+	sata_writel(tegra, (1 << 0), SCFG_OFFSET + T_SATA0_INDEX);
+
+	val = sata_readl(tegra, 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;
+	sata_writel(tegra, val, SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL1_GEN1);
+
+	val = sata_readl(tegra, 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;
+	sata_writel(tegra, val, SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL1_GEN2);
+
+	sata_writel(tegra, T_SATA0_CHX_PHY_CTRL11_GEN2_RX_EQ,
+		    SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL11);
+	sata_writel(tegra, T_SATA0_CHX_PHY_CTRL2_CDR_CNTL_GEN1,
+		    SCFG_OFFSET + T_SATA0_CHX_PHY_CTRL2);
+
+	sata_writel(tegra, 0, SCFG_OFFSET + T_SATA0_INDEX);
+
+	/* Program controller device ID */
+
+	val = sata_readl(tegra, SCFG_OFFSET + T_SATA0_CFG_SATA);
+	val |= T_SATA0_CFG_SATA_BACKDOOR_PROG_IF_EN;
+	sata_writel(tegra, val, SCFG_OFFSET + T_SATA0_CFG_SATA);
+
+	sata_writel(tegra, 0x01060100, SCFG_OFFSET + T_SATA0_BKDOOR_CC);
+
+	val = sata_readl(tegra, SCFG_OFFSET + T_SATA0_CFG_SATA);
+	val &= ~T_SATA0_CFG_SATA_BACKDOOR_PROG_IF_EN;
+	sata_writel(tegra, val, SCFG_OFFSET + T_SATA0_CFG_SATA);
+
+	/* Enable IO & memory access, bus master mode */
+
+	val = sata_readl(tegra, 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;
+	sata_writel(tegra, val, SCFG_OFFSET + T_SATA0_CFG_1);
+
+	/* Program SATA MMIO */
+
+	sata_writel(tegra, 0x10000 << 4, SATA_FPCI_BAR5);
+	sata_writel(tegra, 0x08000 << 13, SCFG_OFFSET + T_SATA0_CFG_9);
+
+	/* Unmask SATA interrupts */
+
+	val = sata_readl(tegra, SATA_INTR_MASK);
+	val |= SATA_INTR_MASK_IP_INT_MASK;
+	sata_writel(tegra, val, 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_platform_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)
+{
+	const struct of_device_id *match;
+	struct ahci_host_priv *hpriv;
+	struct tegra_ahci_priv *tegra;
+	int ret;
+
+	match = of_match_device(tegra_ahci_of_match, &pdev->dev);
+	if (!match)
+		return -EINVAL;
+
+	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;
+
+	tegra->sata_regs = devm_ioremap_resource(&pdev->dev,
+		platform_get_resource(pdev, IORESOURCE_MEM, 1));
+	if (IS_ERR(tegra->sata_regs)) {
+		dev_err(&pdev->dev, "Failed to get SATA IO memory");
+		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");
+		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");
+		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");
+		return PTR_ERR(tegra->sata_cold_rst);
+	}
+
+	tegra->supplies[0].supply = "avdd";
+	tegra->supplies[1].supply = "hvdd";
+	tegra->supplies[2].supply = "vddio";
+
+	ret = devm_regulator_bulk_get(&pdev->dev, ARRAY_SIZE(tegra->supplies),
+					tegra->supplies);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to get regulators");
+		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) {
+		tegra_ahci_controller_deinit(hpriv);
+		return ret;
+	}
+
+	return 0;
+};
+
+static struct platform_driver tegra_ahci_driver = {
+	.probe = tegra_ahci_probe,
+	.remove = ata_platform_remove_one,
+	.driver = {
+		.name = "tegra-ahci",
+		.owner = THIS_MODULE,
+		.of_match_table = tegra_ahci_of_match,
+	},
+};
+module_platform_driver(tegra_ahci_driver);
+
+MODULE_AUTHOR("Mikko Perttunen <mperttunen@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Tegra124 AHCI SATA driver");
+MODULE_LICENSE("GPL v2");
-- 
1.8.1.5

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