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190 lines
4.3 KiB
190 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Amlogic AXG PCIE PHY driver |
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* |
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* Copyright (C) 2020 Remi Pommarel <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/phy/phy.h> |
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#include <linux/regmap.h> |
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#include <linux/reset.h> |
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#include <linux/platform_device.h> |
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#include <linux/bitfield.h> |
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#include <dt-bindings/phy/phy.h> |
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#define MESON_PCIE_REG0 0x00 |
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#define MESON_PCIE_COMMON_CLK BIT(4) |
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#define MESON_PCIE_PORT_SEL GENMASK(3, 2) |
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#define MESON_PCIE_CLK BIT(1) |
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#define MESON_PCIE_POWERDOWN BIT(0) |
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#define MESON_PCIE_TWO_X1 FIELD_PREP(MESON_PCIE_PORT_SEL, 0x3) |
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#define MESON_PCIE_COMMON_REF_CLK FIELD_PREP(MESON_PCIE_COMMON_CLK, 0x1) |
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#define MESON_PCIE_PHY_INIT (MESON_PCIE_TWO_X1 | \ |
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MESON_PCIE_COMMON_REF_CLK) |
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#define MESON_PCIE_RESET_DELAY 500 |
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struct phy_axg_pcie_priv { |
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struct phy *phy; |
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struct phy *analog; |
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struct regmap *regmap; |
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struct reset_control *reset; |
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}; |
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static const struct regmap_config phy_axg_pcie_regmap_conf = { |
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.reg_bits = 8, |
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.val_bits = 32, |
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.reg_stride = 4, |
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.max_register = MESON_PCIE_REG0, |
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}; |
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static int phy_axg_pcie_power_on(struct phy *phy) |
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{ |
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struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy); |
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int ret; |
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ret = phy_power_on(priv->analog); |
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if (ret != 0) |
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return ret; |
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regmap_update_bits(priv->regmap, MESON_PCIE_REG0, |
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MESON_PCIE_POWERDOWN, 0); |
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return 0; |
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} |
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static int phy_axg_pcie_power_off(struct phy *phy) |
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{ |
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struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy); |
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int ret; |
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ret = phy_power_off(priv->analog); |
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if (ret != 0) |
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return ret; |
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regmap_update_bits(priv->regmap, MESON_PCIE_REG0, |
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MESON_PCIE_POWERDOWN, 1); |
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return 0; |
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} |
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static int phy_axg_pcie_init(struct phy *phy) |
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{ |
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struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy); |
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int ret; |
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ret = phy_init(priv->analog); |
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if (ret != 0) |
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return ret; |
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regmap_write(priv->regmap, MESON_PCIE_REG0, MESON_PCIE_PHY_INIT); |
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return reset_control_reset(priv->reset); |
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} |
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static int phy_axg_pcie_exit(struct phy *phy) |
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{ |
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struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy); |
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int ret; |
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ret = phy_exit(priv->analog); |
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if (ret != 0) |
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return ret; |
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return reset_control_reset(priv->reset); |
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} |
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static int phy_axg_pcie_reset(struct phy *phy) |
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{ |
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struct phy_axg_pcie_priv *priv = phy_get_drvdata(phy); |
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int ret = 0; |
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ret = phy_reset(priv->analog); |
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if (ret != 0) |
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goto out; |
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ret = reset_control_assert(priv->reset); |
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if (ret != 0) |
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goto out; |
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udelay(MESON_PCIE_RESET_DELAY); |
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ret = reset_control_deassert(priv->reset); |
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if (ret != 0) |
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goto out; |
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udelay(MESON_PCIE_RESET_DELAY); |
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out: |
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return ret; |
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} |
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static const struct phy_ops phy_axg_pcie_ops = { |
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.init = phy_axg_pcie_init, |
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.exit = phy_axg_pcie_exit, |
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.power_on = phy_axg_pcie_power_on, |
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.power_off = phy_axg_pcie_power_off, |
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.reset = phy_axg_pcie_reset, |
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.owner = THIS_MODULE, |
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}; |
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static int phy_axg_pcie_probe(struct platform_device *pdev) |
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{ |
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struct phy_provider *pphy; |
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struct device *dev = &pdev->dev; |
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struct phy_axg_pcie_priv *priv; |
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struct device_node *np = dev->of_node; |
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void __iomem *base; |
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int ret; |
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priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->phy = devm_phy_create(dev, np, &phy_axg_pcie_ops); |
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if (IS_ERR(priv->phy)) { |
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ret = PTR_ERR(priv->phy); |
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if (ret != -EPROBE_DEFER) |
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dev_err(dev, "failed to create PHY\n"); |
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return ret; |
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} |
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base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(base)) |
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return PTR_ERR(base); |
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priv->regmap = devm_regmap_init_mmio(dev, base, |
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&phy_axg_pcie_regmap_conf); |
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if (IS_ERR(priv->regmap)) |
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return PTR_ERR(priv->regmap); |
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priv->reset = devm_reset_control_array_get_exclusive(dev); |
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if (IS_ERR(priv->reset)) |
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return PTR_ERR(priv->reset); |
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priv->analog = devm_phy_get(dev, "analog"); |
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if (IS_ERR(priv->analog)) |
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return PTR_ERR(priv->analog); |
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phy_set_drvdata(priv->phy, priv); |
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dev_set_drvdata(dev, priv); |
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pphy = devm_of_phy_provider_register(dev, of_phy_simple_xlate); |
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return PTR_ERR_OR_ZERO(pphy); |
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} |
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static const struct of_device_id phy_axg_pcie_of_match[] = { |
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{ |
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.compatible = "amlogic,axg-pcie-phy", |
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}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, phy_axg_pcie_of_match); |
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static struct platform_driver phy_axg_pcie_driver = { |
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.probe = phy_axg_pcie_probe, |
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.driver = { |
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.name = "phy-axg-pcie", |
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.of_match_table = phy_axg_pcie_of_match, |
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}, |
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}; |
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module_platform_driver(phy_axg_pcie_driver); |
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MODULE_AUTHOR("Remi Pommarel <[email protected]>"); |
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MODULE_DESCRIPTION("Amlogic AXG PCIE PHY driver"); |
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MODULE_LICENSE("GPL v2");
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