phy/allwinner/phy-sun9i-usb.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Allwinner sun9i USB phy driver
0004  *
0005  * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org>
0006  *
0007  * Based on phy-sun4i-usb.c from
0008  * Hans de Goede <hdegoede@redhat.com>
0009  *
0010  * and code from
0011  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
0012  */
0013
0014 #include <linux/clk.h>
0015 #include <linux/err.h>
0016 #include <linux/io.h>
0017 #include <linux/module.h>
0018 #include <linux/phy/phy.h>
0019 #include <linux/usb/of.h>
0020 #include <linux/platform_device.h>
0021 #include <linux/reset.h>
0022
0023 #define SUNXI_AHB_INCR16_BURST_EN   BIT(11)
0024 #define SUNXI_AHB_INCR8_BURST_EN    BIT(10)
0025 #define SUNXI_AHB_INCR4_BURST_EN    BIT(9)
0026 #define SUNXI_AHB_INCRX_ALIGN_EN    BIT(8)
0027 #define SUNXI_ULPI_BYPASS_EN        BIT(0)
0028
0029 /* usb1 HSIC specific bits */
0030 #define SUNXI_EHCI_HS_FORCE     BIT(20)
0031 #define SUNXI_HSIC_CONNECT_DET      BIT(17)
0032 #define SUNXI_HSIC_CONNECT_INT      BIT(16)
0033 #define SUNXI_HSIC          BIT(1)
0034
0035 struct sun9i_usb_phy {
0036     struct phy *phy;
0037     void __iomem *pmu;
0038     struct reset_control *reset;
0039     struct clk *clk;
0040     struct clk *hsic_clk;
0041     enum usb_phy_interface type;
0042 };
0043
0044 static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable)
0045 {
0046     u32 bits, reg_value;
0047
0048     bits = SUNXI_AHB_INCR16_BURST_EN | SUNXI_AHB_INCR8_BURST_EN |
0049         SUNXI_AHB_INCR4_BURST_EN | SUNXI_AHB_INCRX_ALIGN_EN |
0050         SUNXI_ULPI_BYPASS_EN;
0051
0052     if (phy->type == USBPHY_INTERFACE_MODE_HSIC)
0053         bits |= SUNXI_HSIC | SUNXI_EHCI_HS_FORCE |
0054             SUNXI_HSIC_CONNECT_DET | SUNXI_HSIC_CONNECT_INT;
0055
0056     reg_value = readl(phy->pmu);
0057
0058     if (enable)
0059         reg_value |= bits;
0060     else
0061         reg_value &= ~bits;
0062
0063     writel(reg_value, phy->pmu);
0064 }
0065
0066 static int sun9i_usb_phy_init(struct phy *_phy)
0067 {
0068     struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
0069     int ret;
0070
0071     ret = clk_prepare_enable(phy->clk);
0072     if (ret)
0073         goto err_clk;
0074
0075     ret = clk_prepare_enable(phy->hsic_clk);
0076     if (ret)
0077         goto err_hsic_clk;
0078
0079     ret = reset_control_deassert(phy->reset);
0080     if (ret)
0081         goto err_reset;
0082
0083     sun9i_usb_phy_passby(phy, 1);
0084     return 0;
0085
0086 err_reset:
0087     clk_disable_unprepare(phy->hsic_clk);
0088
0089 err_hsic_clk:
0090     clk_disable_unprepare(phy->clk);
0091
0092 err_clk:
0093     return ret;
0094 }
0095
0096 static int sun9i_usb_phy_exit(struct phy *_phy)
0097 {
0098     struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
0099
0100     sun9i_usb_phy_passby(phy, 0);
0101     reset_control_assert(phy->reset);
0102     clk_disable_unprepare(phy->hsic_clk);
0103     clk_disable_unprepare(phy->clk);
0104
0105     return 0;
0106 }
0107
0108 static const struct phy_ops sun9i_usb_phy_ops = {
0109     .init       = sun9i_usb_phy_init,
0110     .exit       = sun9i_usb_phy_exit,
0111     .owner      = THIS_MODULE,
0112 };
0113
0114 static int sun9i_usb_phy_probe(struct platform_device *pdev)
0115 {
0116     struct sun9i_usb_phy *phy;
0117     struct device *dev = &pdev->dev;
0118     struct device_node *np = dev->of_node;
0119     struct phy_provider *phy_provider;
0120
0121     phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
0122     if (!phy)
0123         return -ENOMEM;
0124
0125     phy->type = of_usb_get_phy_mode(np);
0126     if (phy->type == USBPHY_INTERFACE_MODE_HSIC) {
0127         phy->clk = devm_clk_get(dev, "hsic_480M");
0128         if (IS_ERR(phy->clk)) {
0129             dev_err(dev, "failed to get hsic_480M clock\n");
0130             return PTR_ERR(phy->clk);
0131         }
0132
0133         phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
0134         if (IS_ERR(phy->hsic_clk)) {
0135             dev_err(dev, "failed to get hsic_12M clock\n");
0136             return PTR_ERR(phy->hsic_clk);
0137         }
0138
0139         phy->reset = devm_reset_control_get(dev, "hsic");
0140         if (IS_ERR(phy->reset)) {
0141             dev_err(dev, "failed to get reset control\n");
0142             return PTR_ERR(phy->reset);
0143         }
0144     } else {
0145         phy->clk = devm_clk_get(dev, "phy");
0146         if (IS_ERR(phy->clk)) {
0147             dev_err(dev, "failed to get phy clock\n");
0148             return PTR_ERR(phy->clk);
0149         }
0150
0151         phy->reset = devm_reset_control_get(dev, "phy");
0152         if (IS_ERR(phy->reset)) {
0153             dev_err(dev, "failed to get reset control\n");
0154             return PTR_ERR(phy->reset);
0155         }
0156     }
0157
0158     phy->pmu = devm_platform_ioremap_resource(pdev, 0);
0159     if (IS_ERR(phy->pmu))
0160         return PTR_ERR(phy->pmu);
0161
0162     phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops);
0163     if (IS_ERR(phy->phy)) {
0164         dev_err(dev, "failed to create PHY\n");
0165         return PTR_ERR(phy->phy);
0166     }
0167
0168     phy_set_drvdata(phy->phy, phy);
0169     phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
0170
0171     return PTR_ERR_OR_ZERO(phy_provider);
0172 }
0173
0174 static const struct of_device_id sun9i_usb_phy_of_match[] = {
0175     { .compatible = "allwinner,sun9i-a80-usb-phy" },
0176     { },
0177 };
0178 MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);
0179
0180 static struct platform_driver sun9i_usb_phy_driver = {
0181     .probe  = sun9i_usb_phy_probe,
0182     .driver = {
0183         .of_match_table = sun9i_usb_phy_of_match,
0184         .name  = "sun9i-usb-phy",
0185     }
0186 };
0187 module_platform_driver(sun9i_usb_phy_driver);
0188
0189 MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");
0190 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
0191 MODULE_LICENSE("GPL");