drivers/phy/allwinner/phy-sun9i-usb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Allwinner sun9i USB phy driver
   4  *
   5  * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org>
   6  *
   7  * Based on phy-sun4i-usb.c from
   8  * Hans de Goede <hdegoede@redhat.com>
   9  *
  10  * and code from
  11  * 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
  35 struct 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
  44 static 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         else
  61                 reg_value &= ~bits;
  62
  63         writel(reg_value, phy->pmu);
  64 }
  65
  66 static 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
  86 err_reset:
  87         clk_disable_unprepare(phy->hsic_clk);
  88
  89 err_hsic_clk:
  90         clk_disable_unprepare(phy->clk);
  91
  92 err_clk:
  93         return ret;
  94 }
  95
  96 static 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
 108 static 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
 114 static 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         struct resource *res;
 121
 122         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 123         if (!phy)
 124                 return -ENOMEM;
 125
 126         phy->type = of_usb_get_phy_mode(np);
 127         if (phy->type == USBPHY_INTERFACE_MODE_HSIC) {
 128                 phy->clk = devm_clk_get(dev, "hsic_480M");
 129                 if (IS_ERR(phy->clk)) {
 130                         dev_err(dev, "failed to get hsic_480M clock\n");
 131                         return PTR_ERR(phy->clk);
 132                 }
 133
 134                 phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
 135                 if (IS_ERR(phy->hsic_clk)) {
 136                         dev_err(dev, "failed to get hsic_12M clock\n");
 137                         return PTR_ERR(phy->hsic_clk);
 138                 }
 139
 140                 phy->reset = devm_reset_control_get(dev, "hsic");
 141                 if (IS_ERR(phy->reset)) {
 142                         dev_err(dev, "failed to get reset control\n");
 143                         return PTR_ERR(phy->reset);
 144                 }
 145         } else {
 146                 phy->clk = devm_clk_get(dev, "phy");
 147                 if (IS_ERR(phy->clk)) {
 148                         dev_err(dev, "failed to get phy clock\n");
 149                         return PTR_ERR(phy->clk);
 150                 }
 151
 152                 phy->reset = devm_reset_control_get(dev, "phy");
 153                 if (IS_ERR(phy->reset)) {
 154                         dev_err(dev, "failed to get reset control\n");
 155                         return PTR_ERR(phy->reset);
 156                 }
 157         }
 158
 159         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 160         phy->pmu = devm_ioremap_resource(dev, res);
 161         if (IS_ERR(phy->pmu))
 162                 return PTR_ERR(phy->pmu);
 163
 164         phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops);
 165         if (IS_ERR(phy->phy)) {
 166                 dev_err(dev, "failed to create PHY\n");
 167                 return PTR_ERR(phy->phy);
 168         }
 169
 170         phy_set_drvdata(phy->phy, phy);
 171         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 172
 173         return PTR_ERR_OR_ZERO(phy_provider);
 174 }
 175
 176 static const struct of_device_id sun9i_usb_phy_of_match[] = {
 177         { .compatible = "allwinner,sun9i-a80-usb-phy" },
 178         { },
 179 };
 180 MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);
 181
 182 static struct platform_driver sun9i_usb_phy_driver = {
 183         .probe  = sun9i_usb_phy_probe,
 184         .driver = {
 185                 .of_match_table = sun9i_usb_phy_of_match,
 186                 .name  = "sun9i-usb-phy",
 187         }
 188 };
 189 module_platform_driver(sun9i_usb_phy_driver);
 190
 191 MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");
 192 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
 193 MODULE_LICENSE("GPL");