247 строки
5.8 KiB
C
247 строки
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2012-2014,2017 The Linux Foundation. All rights reserved.
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* Copyright (c) 2018-2020, Linaro Limited
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <linux/reset.h>
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#include <linux/slab.h>
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#define PHY_CTRL0 0x6C
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#define PHY_CTRL1 0x70
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#define PHY_CTRL2 0x74
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#define PHY_CTRL4 0x7C
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/* PHY_CTRL bits */
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#define REF_PHY_EN BIT(0)
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#define LANE0_PWR_ON BIT(2)
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#define SWI_PCS_CLK_SEL BIT(4)
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#define TST_PWR_DOWN BIT(4)
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#define PHY_RESET BIT(7)
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#define NUM_BULK_CLKS 3
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#define NUM_BULK_REGS 2
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struct ssphy_priv {
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void __iomem *base;
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struct device *dev;
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struct reset_control *reset_com;
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struct reset_control *reset_phy;
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struct regulator_bulk_data regs[NUM_BULK_REGS];
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struct clk_bulk_data clks[NUM_BULK_CLKS];
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enum phy_mode mode;
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};
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static inline void qcom_ssphy_updatel(void __iomem *addr, u32 mask, u32 val)
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{
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writel((readl(addr) & ~mask) | val, addr);
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}
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static int qcom_ssphy_do_reset(struct ssphy_priv *priv)
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{
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int ret;
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if (!priv->reset_com) {
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qcom_ssphy_updatel(priv->base + PHY_CTRL1, PHY_RESET,
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PHY_RESET);
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usleep_range(10, 20);
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qcom_ssphy_updatel(priv->base + PHY_CTRL1, PHY_RESET, 0);
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} else {
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ret = reset_control_assert(priv->reset_com);
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if (ret) {
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dev_err(priv->dev, "Failed to assert reset com\n");
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return ret;
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}
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ret = reset_control_assert(priv->reset_phy);
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if (ret) {
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dev_err(priv->dev, "Failed to assert reset phy\n");
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return ret;
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}
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usleep_range(10, 20);
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ret = reset_control_deassert(priv->reset_com);
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if (ret) {
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dev_err(priv->dev, "Failed to deassert reset com\n");
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return ret;
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}
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ret = reset_control_deassert(priv->reset_phy);
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if (ret) {
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dev_err(priv->dev, "Failed to deassert reset phy\n");
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return ret;
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}
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}
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return 0;
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}
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static int qcom_ssphy_power_on(struct phy *phy)
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{
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struct ssphy_priv *priv = phy_get_drvdata(phy);
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int ret;
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ret = regulator_bulk_enable(NUM_BULK_REGS, priv->regs);
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if (ret)
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return ret;
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ret = clk_bulk_prepare_enable(NUM_BULK_CLKS, priv->clks);
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if (ret)
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goto err_disable_regulator;
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ret = qcom_ssphy_do_reset(priv);
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if (ret)
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goto err_disable_clock;
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writeb(SWI_PCS_CLK_SEL, priv->base + PHY_CTRL0);
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qcom_ssphy_updatel(priv->base + PHY_CTRL4, LANE0_PWR_ON, LANE0_PWR_ON);
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qcom_ssphy_updatel(priv->base + PHY_CTRL2, REF_PHY_EN, REF_PHY_EN);
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qcom_ssphy_updatel(priv->base + PHY_CTRL4, TST_PWR_DOWN, 0);
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return 0;
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err_disable_clock:
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clk_bulk_disable_unprepare(NUM_BULK_CLKS, priv->clks);
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err_disable_regulator:
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regulator_bulk_disable(NUM_BULK_REGS, priv->regs);
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return ret;
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}
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static int qcom_ssphy_power_off(struct phy *phy)
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{
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struct ssphy_priv *priv = phy_get_drvdata(phy);
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qcom_ssphy_updatel(priv->base + PHY_CTRL4, LANE0_PWR_ON, 0);
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qcom_ssphy_updatel(priv->base + PHY_CTRL2, REF_PHY_EN, 0);
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qcom_ssphy_updatel(priv->base + PHY_CTRL4, TST_PWR_DOWN, TST_PWR_DOWN);
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clk_bulk_disable_unprepare(NUM_BULK_CLKS, priv->clks);
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regulator_bulk_disable(NUM_BULK_REGS, priv->regs);
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return 0;
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}
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static int qcom_ssphy_init_clock(struct ssphy_priv *priv)
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{
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priv->clks[0].id = "ref";
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priv->clks[1].id = "ahb";
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priv->clks[2].id = "pipe";
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return devm_clk_bulk_get(priv->dev, NUM_BULK_CLKS, priv->clks);
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}
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static int qcom_ssphy_init_regulator(struct ssphy_priv *priv)
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{
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int ret;
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priv->regs[0].supply = "vdd";
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priv->regs[1].supply = "vdda1p8";
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ret = devm_regulator_bulk_get(priv->dev, NUM_BULK_REGS, priv->regs);
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if (ret) {
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if (ret != -EPROBE_DEFER)
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dev_err(priv->dev, "Failed to get regulators\n");
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return ret;
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}
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return ret;
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}
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static int qcom_ssphy_init_reset(struct ssphy_priv *priv)
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{
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priv->reset_com = devm_reset_control_get_optional_exclusive(priv->dev, "com");
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if (IS_ERR(priv->reset_com)) {
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dev_err(priv->dev, "Failed to get reset control com\n");
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return PTR_ERR(priv->reset_com);
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}
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if (priv->reset_com) {
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/* if reset_com is present, reset_phy is no longer optional */
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priv->reset_phy = devm_reset_control_get_exclusive(priv->dev, "phy");
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if (IS_ERR(priv->reset_phy)) {
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dev_err(priv->dev, "Failed to get reset control phy\n");
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return PTR_ERR(priv->reset_phy);
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}
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}
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return 0;
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}
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static const struct phy_ops qcom_ssphy_ops = {
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.power_off = qcom_ssphy_power_off,
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.power_on = qcom_ssphy_power_on,
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.owner = THIS_MODULE,
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};
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static int qcom_ssphy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct phy_provider *provider;
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struct ssphy_priv *priv;
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struct phy *phy;
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int ret;
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priv = devm_kzalloc(dev, sizeof(struct ssphy_priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->dev = dev;
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priv->mode = PHY_MODE_INVALID;
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priv->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(priv->base))
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return PTR_ERR(priv->base);
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ret = qcom_ssphy_init_clock(priv);
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if (ret)
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return ret;
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ret = qcom_ssphy_init_reset(priv);
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if (ret)
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return ret;
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ret = qcom_ssphy_init_regulator(priv);
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if (ret)
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return ret;
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phy = devm_phy_create(dev, dev->of_node, &qcom_ssphy_ops);
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if (IS_ERR(phy)) {
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dev_err(dev, "Failed to create the SS phy\n");
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return PTR_ERR(phy);
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}
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phy_set_drvdata(phy, priv);
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provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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return PTR_ERR_OR_ZERO(provider);
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}
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static const struct of_device_id qcom_ssphy_match[] = {
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{ .compatible = "qcom,usb-ss-28nm-phy", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, qcom_ssphy_match);
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static struct platform_driver qcom_ssphy_driver = {
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.probe = qcom_ssphy_probe,
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.driver = {
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.name = "qcom-usb-ssphy",
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.of_match_table = qcom_ssphy_match,
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},
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};
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module_platform_driver(qcom_ssphy_driver);
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MODULE_DESCRIPTION("Qualcomm SuperSpeed USB PHY driver");
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MODULE_LICENSE("GPL v2");
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