diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c b/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c new file mode 100644 index 000000000..a3e1108b7 --- /dev/null +++ b/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c @@ -0,0 +1,255 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Amlogic AXG MIPI + PCIE analog PHY driver + * + * Copyright (C) 2019 Remi Pommarel <repk@triplefau.lt> + */ +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/module.h> +#include <linux/phy/phy.h> +#include <linux/regmap.h> +#include <linux/delay.h> +#include <linux/mfd/syscon.h> +#include <linux/platform_device.h> +#include <dt-bindings/phy/phy.h> + +#define HHI_MIPI_CNTL0 0x00 +#define HHI_MIPI_CNTL0_COMMON_BLOCK GENMASK(31, 28) +#define HHI_MIPI_CNTL0_ENABLE BIT(29) +#define HHI_MIPI_CNTL0_BANDGAP BIT(26) +#define HHI_MIPI_CNTL0_DIF_REF_CTL1 GENMASK(25, 16) +#define HHI_MIPI_CNTL0_DIF_REF_CTL0 GENMASK(15, 0) + +#define HHI_MIPI_CNTL1 0x04 +#define HHI_MIPI_CNTL1_CH0_CML_PDR_EN BIT(12) +#define HHI_MIPI_CNTL1_LP_ABILITY GENMASK(5, 4) +#define HHI_MIPI_CNTL1_LP_RESISTER BIT(3) +#define HHI_MIPI_CNTL1_INPUT_SETTING BIT(2) +#define HHI_MIPI_CNTL1_INPUT_SEL BIT(1) +#define HHI_MIPI_CNTL1_PRBS7_EN BIT(0) + +#define HHI_MIPI_CNTL2 0x08 +#define HHI_MIPI_CNTL2_CH_PU GENMASK(31, 25) +#define HHI_MIPI_CNTL2_CH_CTL GENMASK(24, 19) +#define HHI_MIPI_CNTL2_CH0_DIGDR_EN BIT(18) +#define HHI_MIPI_CNTL2_CH_DIGDR_EN BIT(17) +#define HHI_MIPI_CNTL2_LPULPS_EN BIT(16) +#define HHI_MIPI_CNTL2_CH_EN GENMASK(15, 11) +#define HHI_MIPI_CNTL2_CH0_LP_CTL GENMASK(10, 1) + +#define DSI_LANE_0 BIT(4) +#define DSI_LANE_1 BIT(3) +#define DSI_LANE_CLK BIT(2) +#define DSI_LANE_2 BIT(1) +#define DSI_LANE_3 BIT(0) + +struct phy_axg_mipi_pcie_analog_priv { + struct phy *phy; + struct regmap *regmap; + bool dsi_configured; + bool dsi_enabled; + bool powered; + struct phy_configure_opts_mipi_dphy config; +}; + +static void phy_bandgap_enable(struct phy_axg_mipi_pcie_analog_priv *priv) +{ + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, + HHI_MIPI_CNTL0_BANDGAP, HHI_MIPI_CNTL0_BANDGAP); + + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, + HHI_MIPI_CNTL0_ENABLE, HHI_MIPI_CNTL0_ENABLE); +} + +static void phy_bandgap_disable(struct phy_axg_mipi_pcie_analog_priv *priv) +{ + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, + HHI_MIPI_CNTL0_BANDGAP, 0); + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, + HHI_MIPI_CNTL0_ENABLE, 0); +} + +static void phy_dsi_analog_enable(struct phy_axg_mipi_pcie_analog_priv *priv) +{ + u32 reg; + + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, + HHI_MIPI_CNTL0_DIF_REF_CTL1, + FIELD_PREP(HHI_MIPI_CNTL0_DIF_REF_CTL1, 0x1b8)); + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, + BIT(31), BIT(31)); + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, + HHI_MIPI_CNTL0_DIF_REF_CTL0, + FIELD_PREP(HHI_MIPI_CNTL0_DIF_REF_CTL0, 0x8)); + + regmap_write(priv->regmap, HHI_MIPI_CNTL1, 0x001e); + + regmap_write(priv->regmap, HHI_MIPI_CNTL2, + (0x26e0 << 16) | (0x459 << 0)); + + reg = DSI_LANE_CLK; + switch (priv->config.lanes) { + case 4: + reg |= DSI_LANE_3; + fallthrough; + case 3: + reg |= DSI_LANE_2; + fallthrough; + case 2: + reg |= DSI_LANE_1; + fallthrough; + case 1: + reg |= DSI_LANE_0; + break; + default: + reg = 0; + } + + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL2, + HHI_MIPI_CNTL2_CH_EN, + FIELD_PREP(HHI_MIPI_CNTL2_CH_EN, reg)); + + priv->dsi_enabled = true; +} + +static void phy_dsi_analog_disable(struct phy_axg_mipi_pcie_analog_priv *priv) +{ + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, + HHI_MIPI_CNTL0_DIF_REF_CTL1, + FIELD_PREP(HHI_MIPI_CNTL0_DIF_REF_CTL1, 0)); + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, BIT(31), 0); + regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, + HHI_MIPI_CNTL0_DIF_REF_CTL1, 0); + + regmap_write(priv->regmap, HHI_MIPI_CNTL1, 0x6); + + regmap_write(priv->regmap, HHI_MIPI_CNTL2, 0x00200000); + + priv->dsi_enabled = false; +} + +static int phy_axg_mipi_pcie_analog_configure(struct phy *phy, + union phy_configure_opts *opts) +{ + struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy); + int ret; + + ret = phy_mipi_dphy_config_validate(&opts->mipi_dphy); + if (ret) + return ret; + + memcpy(&priv->config, opts, sizeof(priv->config)); + + priv->dsi_configured = true; + + /* If PHY was already powered on, setup the DSI analog part */ + if (priv->powered) { + /* If reconfiguring, disable & reconfigure */ + if (priv->dsi_enabled) + phy_dsi_analog_disable(priv); + + usleep_range(100, 200); + + phy_dsi_analog_enable(priv); + } + + return 0; +} + +static int phy_axg_mipi_pcie_analog_power_on(struct phy *phy) +{ + struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy); + + phy_bandgap_enable(priv); + + if (priv->dsi_configured) + phy_dsi_analog_enable(priv); + + priv->powered = true; + + return 0; +} + +static int phy_axg_mipi_pcie_analog_power_off(struct phy *phy) +{ + struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy); + + phy_bandgap_disable(priv); + + if (priv->dsi_enabled) + phy_dsi_analog_disable(priv); + + priv->powered = false; + + return 0; +} + +static const struct phy_ops phy_axg_mipi_pcie_analog_ops = { + .configure = phy_axg_mipi_pcie_analog_configure, + .power_on = phy_axg_mipi_pcie_analog_power_on, + .power_off = phy_axg_mipi_pcie_analog_power_off, + .owner = THIS_MODULE, +}; + +static int phy_axg_mipi_pcie_analog_probe(struct platform_device *pdev) +{ + struct phy_provider *phy; + struct device *dev = &pdev->dev; + struct phy_axg_mipi_pcie_analog_priv *priv; + struct device_node *np = dev->of_node, *parent_np; + struct regmap *map; + int ret; + + priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + /* Get the hhi system controller node */ + parent_np = of_get_parent(dev->of_node); + map = syscon_node_to_regmap(parent_np); + of_node_put(parent_np); + if (IS_ERR(map)) { + dev_err(dev, + "failed to get HHI regmap\n"); + return PTR_ERR(map); + } + + priv->regmap = map; + + priv->phy = devm_phy_create(dev, np, &phy_axg_mipi_pcie_analog_ops); + if (IS_ERR(priv->phy)) { + ret = PTR_ERR(priv->phy); + if (ret != -EPROBE_DEFER) + dev_err(dev, "failed to create PHY\n"); + return ret; + } + + phy_set_drvdata(priv->phy, priv); + dev_set_drvdata(dev, priv); + + phy = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy); +} + +static const struct of_device_id phy_axg_mipi_pcie_analog_of_match[] = { + { + .compatible = "amlogic,axg-mipi-pcie-analog-phy", + }, + { }, +}; +MODULE_DEVICE_TABLE(of, phy_axg_mipi_pcie_analog_of_match); + +static struct platform_driver phy_axg_mipi_pcie_analog_driver = { + .probe = phy_axg_mipi_pcie_analog_probe, + .driver = { + .name = "phy-axg-mipi-pcie-analog", + .of_match_table = phy_axg_mipi_pcie_analog_of_match, + }, +}; +module_platform_driver(phy_axg_mipi_pcie_analog_driver); + +MODULE_AUTHOR("Remi Pommarel <repk@triplefau.lt>"); +MODULE_DESCRIPTION("Amlogic AXG MIPI + PCIE analog PHY driver"); +MODULE_LICENSE("GPL v2"); |