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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Allwinner sun50i(H6) USB 3.0 phy driver
- *
- * Copyright (C) 2017 Icenowy Zheng <[email protected]>
- *
- * Based on phy-sun9i-usb.c, which is:
- *
- * Copyright (C) 2014-2015 Chen-Yu Tsai <[email protected]>
- *
- * Based on code from Allwinner BSP, which is:
- *
- * Copyright (c) 2010-2015 Allwinner Technology Co., Ltd.
- */
- #include <linux/clk.h>
- #include <linux/err.h>
- #include <linux/io.h>
- #include <linux/module.h>
- #include <linux/phy/phy.h>
- #include <linux/platform_device.h>
- #include <linux/reset.h>
- /* Interface Status and Control Registers */
- #define SUNXI_ISCR 0x00
- #define SUNXI_PIPE_CLOCK_CONTROL 0x14
- #define SUNXI_PHY_TUNE_LOW 0x18
- #define SUNXI_PHY_TUNE_HIGH 0x1c
- #define SUNXI_PHY_EXTERNAL_CONTROL 0x20
- /* USB2.0 Interface Status and Control Register */
- #define SUNXI_ISCR_FORCE_VBUS (3 << 12)
- /* PIPE Clock Control Register */
- #define SUNXI_PCC_PIPE_CLK_OPEN (1 << 6)
- /* PHY External Control Register */
- #define SUNXI_PEC_EXTERN_VBUS (3 << 1)
- #define SUNXI_PEC_SSC_EN (1 << 24)
- #define SUNXI_PEC_REF_SSP_EN (1 << 26)
- /* PHY Tune High Register */
- #define SUNXI_TX_DEEMPH_3P5DB(n) ((n) << 19)
- #define SUNXI_TX_DEEMPH_3P5DB_MASK GENMASK(24, 19)
- #define SUNXI_TX_DEEMPH_6DB(n) ((n) << 13)
- #define SUNXI_TX_DEEMPH_6GB_MASK GENMASK(18, 13)
- #define SUNXI_TX_SWING_FULL(n) ((n) << 6)
- #define SUNXI_TX_SWING_FULL_MASK GENMASK(12, 6)
- #define SUNXI_LOS_BIAS(n) ((n) << 3)
- #define SUNXI_LOS_BIAS_MASK GENMASK(5, 3)
- #define SUNXI_TXVBOOSTLVL(n) ((n) << 0)
- #define SUNXI_TXVBOOSTLVL_MASK GENMASK(2, 0)
- struct sun50i_usb3_phy {
- struct phy *phy;
- void __iomem *regs;
- struct reset_control *reset;
- struct clk *clk;
- };
- static void sun50i_usb3_phy_open(struct sun50i_usb3_phy *phy)
- {
- u32 val;
- val = readl(phy->regs + SUNXI_PHY_EXTERNAL_CONTROL);
- val |= SUNXI_PEC_EXTERN_VBUS;
- val |= SUNXI_PEC_SSC_EN | SUNXI_PEC_REF_SSP_EN;
- writel(val, phy->regs + SUNXI_PHY_EXTERNAL_CONTROL);
- val = readl(phy->regs + SUNXI_PIPE_CLOCK_CONTROL);
- val |= SUNXI_PCC_PIPE_CLK_OPEN;
- writel(val, phy->regs + SUNXI_PIPE_CLOCK_CONTROL);
- val = readl(phy->regs + SUNXI_ISCR);
- val |= SUNXI_ISCR_FORCE_VBUS;
- writel(val, phy->regs + SUNXI_ISCR);
- /*
- * All the magic numbers written to the PHY_TUNE_{LOW_HIGH}
- * registers are directly taken from the BSP USB3 driver from
- * Allwiner.
- */
- writel(0x0047fc87, phy->regs + SUNXI_PHY_TUNE_LOW);
- val = readl(phy->regs + SUNXI_PHY_TUNE_HIGH);
- val &= ~(SUNXI_TXVBOOSTLVL_MASK | SUNXI_LOS_BIAS_MASK |
- SUNXI_TX_SWING_FULL_MASK | SUNXI_TX_DEEMPH_6GB_MASK |
- SUNXI_TX_DEEMPH_3P5DB_MASK);
- val |= SUNXI_TXVBOOSTLVL(0x7);
- val |= SUNXI_LOS_BIAS(0x7);
- val |= SUNXI_TX_SWING_FULL(0x55);
- val |= SUNXI_TX_DEEMPH_6DB(0x20);
- val |= SUNXI_TX_DEEMPH_3P5DB(0x15);
- writel(val, phy->regs + SUNXI_PHY_TUNE_HIGH);
- }
- static int sun50i_usb3_phy_init(struct phy *_phy)
- {
- struct sun50i_usb3_phy *phy = phy_get_drvdata(_phy);
- int ret;
- ret = clk_prepare_enable(phy->clk);
- if (ret)
- return ret;
- ret = reset_control_deassert(phy->reset);
- if (ret) {
- clk_disable_unprepare(phy->clk);
- return ret;
- }
- sun50i_usb3_phy_open(phy);
- return 0;
- }
- static int sun50i_usb3_phy_exit(struct phy *_phy)
- {
- struct sun50i_usb3_phy *phy = phy_get_drvdata(_phy);
- reset_control_assert(phy->reset);
- clk_disable_unprepare(phy->clk);
- return 0;
- }
- static const struct phy_ops sun50i_usb3_phy_ops = {
- .init = sun50i_usb3_phy_init,
- .exit = sun50i_usb3_phy_exit,
- .owner = THIS_MODULE,
- };
- static int sun50i_usb3_phy_probe(struct platform_device *pdev)
- {
- struct sun50i_usb3_phy *phy;
- struct device *dev = &pdev->dev;
- struct phy_provider *phy_provider;
- phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
- if (!phy)
- return -ENOMEM;
- phy->clk = devm_clk_get(dev, NULL);
- if (IS_ERR(phy->clk)) {
- if (PTR_ERR(phy->clk) != -EPROBE_DEFER)
- dev_err(dev, "failed to get phy clock\n");
- return PTR_ERR(phy->clk);
- }
- phy->reset = devm_reset_control_get(dev, NULL);
- if (IS_ERR(phy->reset)) {
- dev_err(dev, "failed to get reset control\n");
- return PTR_ERR(phy->reset);
- }
- phy->regs = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(phy->regs))
- return PTR_ERR(phy->regs);
- phy->phy = devm_phy_create(dev, NULL, &sun50i_usb3_phy_ops);
- if (IS_ERR(phy->phy)) {
- dev_err(dev, "failed to create PHY\n");
- return PTR_ERR(phy->phy);
- }
- phy_set_drvdata(phy->phy, phy);
- phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
- return PTR_ERR_OR_ZERO(phy_provider);
- }
- static const struct of_device_id sun50i_usb3_phy_of_match[] = {
- { .compatible = "allwinner,sun50i-h6-usb3-phy" },
- { },
- };
- MODULE_DEVICE_TABLE(of, sun50i_usb3_phy_of_match);
- static struct platform_driver sun50i_usb3_phy_driver = {
- .probe = sun50i_usb3_phy_probe,
- .driver = {
- .of_match_table = sun50i_usb3_phy_of_match,
- .name = "sun50i-usb3-phy",
- }
- };
- module_platform_driver(sun50i_usb3_phy_driver);
- MODULE_DESCRIPTION("Allwinner H6 USB 3.0 phy driver");
- MODULE_AUTHOR("Icenowy Zheng <[email protected]>");
- MODULE_LICENSE("GPL");
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