diff options
Diffstat (limited to 'drivers/ata/ahci_tegra.c')
| -rw-r--r-- | drivers/ata/ahci_tegra.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/drivers/ata/ahci_tegra.c b/drivers/ata/ahci_tegra.c new file mode 100644 index 000000000000..fc3df47fca35 --- /dev/null +++ b/drivers/ata/ahci_tegra.c @@ -0,0 +1,376 @@ +/* + * drivers/ata/ahci_tegra.c + * + * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved. + * + * Author: + * Mikko Perttunen <mperttunen@nvidia.com> + * + * 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 + +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; + /* Needs special handling, cannot use ahci_platform */ + struct clk *sata_clk; + 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, + tegra->sata_clk, + tegra->sata_rst); + if (ret) + goto disable_regulators; + + reset_control_assert(tegra->sata_oob_rst); + reset_control_assert(tegra->sata_cold_rst); + + ret = ahci_platform_enable_resources(hpriv); + if (ret) + goto disable_power; + + reset_control_deassert(tegra->sata_cold_rst); + reset_control_deassert(tegra->sata_oob_rst); + + return 0; + +disable_power: + clk_disable_unprepare(tegra->sata_clk); + + 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); + + clk_disable_unprepare(tegra->sata_clk); + 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); + } + + tegra->sata_clk = devm_clk_get(&pdev->dev, "sata"); + if (IS_ERR(tegra->sata_clk)) { + dev_err(&pdev->dev, "Failed to get sata clock\n"); + return PTR_ERR(tegra->sata_clk); + } + + 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); + 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@nvidia.com>"); +MODULE_DESCRIPTION("Tegra124 AHCI SATA driver"); +MODULE_LICENSE("GPL v2"); |
