192 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Allwinner sun9i USB phy driver4 *5 * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org>6 *7 * Based on phy-sun4i-usb.c from8 * Hans de Goede <hdegoede@redhat.com>9 *10 * and code from11 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>12 */13 14#include <linux/clk.h>15#include <linux/err.h>16#include <linux/io.h>17#include <linux/module.h>18#include <linux/phy/phy.h>19#include <linux/usb/of.h>20#include <linux/platform_device.h>21#include <linux/reset.h>22 23#define SUNXI_AHB_INCR16_BURST_EN BIT(11)24#define SUNXI_AHB_INCR8_BURST_EN BIT(10)25#define SUNXI_AHB_INCR4_BURST_EN BIT(9)26#define SUNXI_AHB_INCRX_ALIGN_EN BIT(8)27#define SUNXI_ULPI_BYPASS_EN BIT(0)28 29/* usb1 HSIC specific bits */30#define SUNXI_EHCI_HS_FORCE BIT(20)31#define SUNXI_HSIC_CONNECT_DET BIT(17)32#define SUNXI_HSIC_CONNECT_INT BIT(16)33#define SUNXI_HSIC BIT(1)34 35struct sun9i_usb_phy {36 struct phy *phy;37 void __iomem *pmu;38 struct reset_control *reset;39 struct clk *clk;40 struct clk *hsic_clk;41 enum usb_phy_interface type;42};43 44static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable)45{46 u32 bits, reg_value;47 48 bits = SUNXI_AHB_INCR16_BURST_EN | SUNXI_AHB_INCR8_BURST_EN |49 SUNXI_AHB_INCR4_BURST_EN | SUNXI_AHB_INCRX_ALIGN_EN |50 SUNXI_ULPI_BYPASS_EN;51 52 if (phy->type == USBPHY_INTERFACE_MODE_HSIC)53 bits |= SUNXI_HSIC | SUNXI_EHCI_HS_FORCE |54 SUNXI_HSIC_CONNECT_DET | SUNXI_HSIC_CONNECT_INT;55 56 reg_value = readl(phy->pmu);57 58 if (enable)59 reg_value |= bits;60 else61 reg_value &= ~bits;62 63 writel(reg_value, phy->pmu);64}65 66static int sun9i_usb_phy_init(struct phy *_phy)67{68 struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);69 int ret;70 71 ret = clk_prepare_enable(phy->clk);72 if (ret)73 goto err_clk;74 75 ret = clk_prepare_enable(phy->hsic_clk);76 if (ret)77 goto err_hsic_clk;78 79 ret = reset_control_deassert(phy->reset);80 if (ret)81 goto err_reset;82 83 sun9i_usb_phy_passby(phy, 1);84 return 0;85 86err_reset:87 clk_disable_unprepare(phy->hsic_clk);88 89err_hsic_clk:90 clk_disable_unprepare(phy->clk);91 92err_clk:93 return ret;94}95 96static int sun9i_usb_phy_exit(struct phy *_phy)97{98 struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);99 100 sun9i_usb_phy_passby(phy, 0);101 reset_control_assert(phy->reset);102 clk_disable_unprepare(phy->hsic_clk);103 clk_disable_unprepare(phy->clk);104 105 return 0;106}107 108static const struct phy_ops sun9i_usb_phy_ops = {109 .init = sun9i_usb_phy_init,110 .exit = sun9i_usb_phy_exit,111 .owner = THIS_MODULE,112};113 114static int sun9i_usb_phy_probe(struct platform_device *pdev)115{116 struct sun9i_usb_phy *phy;117 struct device *dev = &pdev->dev;118 struct device_node *np = dev->of_node;119 struct phy_provider *phy_provider;120 121 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);122 if (!phy)123 return -ENOMEM;124 125 phy->type = of_usb_get_phy_mode(np);126 if (phy->type == USBPHY_INTERFACE_MODE_HSIC) {127 phy->clk = devm_clk_get(dev, "hsic_480M");128 if (IS_ERR(phy->clk)) {129 dev_err(dev, "failed to get hsic_480M clock\n");130 return PTR_ERR(phy->clk);131 }132 133 phy->hsic_clk = devm_clk_get(dev, "hsic_12M");134 if (IS_ERR(phy->hsic_clk)) {135 dev_err(dev, "failed to get hsic_12M clock\n");136 return PTR_ERR(phy->hsic_clk);137 }138 139 phy->reset = devm_reset_control_get(dev, "hsic");140 if (IS_ERR(phy->reset)) {141 dev_err(dev, "failed to get reset control\n");142 return PTR_ERR(phy->reset);143 }144 } else {145 phy->clk = devm_clk_get(dev, "phy");146 if (IS_ERR(phy->clk)) {147 dev_err(dev, "failed to get phy clock\n");148 return PTR_ERR(phy->clk);149 }150 151 phy->reset = devm_reset_control_get(dev, "phy");152 if (IS_ERR(phy->reset)) {153 dev_err(dev, "failed to get reset control\n");154 return PTR_ERR(phy->reset);155 }156 }157 158 phy->pmu = devm_platform_ioremap_resource(pdev, 0);159 if (IS_ERR(phy->pmu))160 return PTR_ERR(phy->pmu);161 162 phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops);163 if (IS_ERR(phy->phy)) {164 dev_err(dev, "failed to create PHY\n");165 return PTR_ERR(phy->phy);166 }167 168 phy_set_drvdata(phy->phy, phy);169 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);170 171 return PTR_ERR_OR_ZERO(phy_provider);172}173 174static const struct of_device_id sun9i_usb_phy_of_match[] = {175 { .compatible = "allwinner,sun9i-a80-usb-phy" },176 { },177};178MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);179 180static struct platform_driver sun9i_usb_phy_driver = {181 .probe = sun9i_usb_phy_probe,182 .driver = {183 .of_match_table = sun9i_usb_phy_of_match,184 .name = "sun9i-usb-phy",185 }186};187module_platform_driver(sun9i_usb_phy_driver);188 189MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");190MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");191MODULE_LICENSE("GPL");192