diff options
Diffstat (limited to 'drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c')
| -rw-r--r-- | drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c | 188 |
1 files changed, 188 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 000000000000..1431cbf885e1 --- /dev/null +++ b/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Amlogic AXG MIPI + PCIE analog PHY driver + * + * Copyright (C) 2019 Remi Pommarel <repk@triplefau.lt> + */ +#include <linux/module.h> +#include <linux/phy/phy.h> +#include <linux/regmap.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_DECODE_TO_RTERM GENMASK(15, 12) +#define HHI_MIPI_CNTL0_OUTPUT_EN BIT(3) + +#define HHI_MIPI_CNTL1 0x01 +#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 0x02 +#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(n) BIT(15 - (n)) +#define HHI_MIPI_CNTL2_CH0_LP_CTL GENMASK(10, 1) + +struct phy_axg_mipi_pcie_analog_priv { + struct phy *phy; + unsigned int mode; + struct regmap *regmap; +}; + +static const struct regmap_config phy_axg_mipi_pcie_analog_regmap_conf = { + .reg_bits = 8, + .val_bits = 32, + .reg_stride = 4, + .max_register = HHI_MIPI_CNTL2, +}; + +static int phy_axg_mipi_pcie_analog_power_on(struct phy *phy) +{ + struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy); + + /* MIPI not supported yet */ + if (priv->mode != PHY_TYPE_PCIE) + return -EINVAL; + + 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); + 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); + + /* MIPI not supported yet */ + if (priv->mode != PHY_TYPE_PCIE) + return -EINVAL; + + 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); + return 0; +} + +static int phy_axg_mipi_pcie_analog_init(struct phy *phy) +{ + return 0; +} + +static int phy_axg_mipi_pcie_analog_exit(struct phy *phy) +{ + return 0; +} + +static const struct phy_ops phy_axg_mipi_pcie_analog_ops = { + .init = phy_axg_mipi_pcie_analog_init, + .exit = phy_axg_mipi_pcie_analog_exit, + .power_on = phy_axg_mipi_pcie_analog_power_on, + .power_off = phy_axg_mipi_pcie_analog_power_off, + .owner = THIS_MODULE, +}; + +static struct phy *phy_axg_mipi_pcie_analog_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct phy_axg_mipi_pcie_analog_priv *priv = dev_get_drvdata(dev); + unsigned int mode; + + if (args->args_count != 1) { + dev_err(dev, "invalid number of arguments\n"); + return ERR_PTR(-EINVAL); + } + + mode = args->args[0]; + + /* MIPI mode is not supported yet */ + if (mode != PHY_TYPE_PCIE) { + dev_err(dev, "invalid phy mode select argument\n"); + return ERR_PTR(-EINVAL); + } + + priv->mode = mode; + return priv->phy; +} + +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; + struct regmap *map; + struct resource *res; + void __iomem *base; + int ret; + + priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) { + dev_err(dev, "failed to get regmap base\n"); + return PTR_ERR(base); + } + + map = devm_regmap_init_mmio(dev, base, + &phy_axg_mipi_pcie_analog_regmap_conf); + 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, + phy_axg_mipi_pcie_analog_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"); |