drivers/phy/phy-sun9i-usb.c

   1 /*
   2  * Allwinner sun9i USB phy driver
   3  *
   4  * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org>
   5  *
   6  * Based on phy-sun4i-usb.c from
   7  * Hans de Goede <hdegoede@redhat.com>
   8  *
   9  * and code from
  10  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  */
  22
  23 #include <linux/clk.h>
  24 #include <linux/err.h>
  25 #include <linux/io.h>
  26 #include <linux/module.h>
  27 #include <linux/phy/phy.h>
  28 #include <linux/usb/of.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/reset.h>
  31
  32 #define SUNXI_AHB_INCR16_BURST_EN       BIT(11)
  33 #define SUNXI_AHB_INCR8_BURST_EN        BIT(10)
  34 #define SUNXI_AHB_INCR4_BURST_EN        BIT(9)
  35 #define SUNXI_AHB_INCRX_ALIGN_EN        BIT(8)
  36 #define SUNXI_ULPI_BYPASS_EN            BIT(0)
  37
  38 /* usb1 HSIC specific bits */
  39 #define SUNXI_EHCI_HS_FORCE             BIT(20)
  40 #define SUNXI_HSIC_CONNECT_DET          BIT(17)
  41 #define SUNXI_HSIC_CONNECT_INT          BIT(16)
  42 #define SUNXI_HSIC                      BIT(1)
  43
  44 struct sun9i_usb_phy {
  45         struct phy *phy;
  46         void __iomem *pmu;
  47         struct reset_control *reset;
  48         struct clk *clk;
  49         struct clk *hsic_clk;
  50         enum usb_phy_interface type;
  51 };
  52
  53 static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable)
  54 {
  55         u32 bits, reg_value;
  56
  57         bits = SUNXI_AHB_INCR16_BURST_EN | SUNXI_AHB_INCR8_BURST_EN |
  58                 SUNXI_AHB_INCR4_BURST_EN | SUNXI_AHB_INCRX_ALIGN_EN |
  59                 SUNXI_ULPI_BYPASS_EN;
  60
  61         if (phy->type == USBPHY_INTERFACE_MODE_HSIC)
  62                 bits |= SUNXI_HSIC | SUNXI_EHCI_HS_FORCE |
  63                         SUNXI_HSIC_CONNECT_DET | SUNXI_HSIC_CONNECT_INT;
  64
  65         reg_value = readl(phy->pmu);
  66
  67         if (enable)
  68                 reg_value |= bits;
  69         else
  70                 reg_value &= ~bits;
  71
  72         writel(reg_value, phy->pmu);
  73 }
  74
  75 static int sun9i_usb_phy_init(struct phy *_phy)
  76 {
  77         struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
  78         int ret;
  79
  80         ret = clk_prepare_enable(phy->clk);
  81         if (ret)
  82                 goto err_clk;
  83
  84         ret = clk_prepare_enable(phy->hsic_clk);
  85         if (ret)
  86                 goto err_hsic_clk;
  87
  88         ret = reset_control_deassert(phy->reset);
  89         if (ret)
  90                 goto err_reset;
  91
  92         sun9i_usb_phy_passby(phy, 1);
  93         return 0;
  94
  95 err_reset:
  96         clk_disable_unprepare(phy->hsic_clk);
  97
  98 err_hsic_clk:
  99         clk_disable_unprepare(phy->clk);
 100
 101 err_clk:
 102         return ret;
 103 }
 104
 105 static int sun9i_usb_phy_exit(struct phy *_phy)
 106 {
 107         struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
 108
 109         sun9i_usb_phy_passby(phy, 0);
 110         reset_control_assert(phy->reset);
 111         clk_disable_unprepare(phy->hsic_clk);
 112         clk_disable_unprepare(phy->clk);
 113
 114         return 0;
 115 }
 116
 117 static const struct phy_ops sun9i_usb_phy_ops = {
 118         .init           = sun9i_usb_phy_init,
 119         .exit           = sun9i_usb_phy_exit,
 120         .owner          = THIS_MODULE,
 121 };
 122
 123 static int sun9i_usb_phy_probe(struct platform_device *pdev)
 124 {
 125         struct sun9i_usb_phy *phy;
 126         struct device *dev = &pdev->dev;
 127         struct device_node *np = dev->of_node;
 128         struct phy_provider *phy_provider;
 129         struct resource *res;
 130
 131         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 132         if (!phy)
 133                 return -ENOMEM;
 134
 135         phy->type = of_usb_get_phy_mode(np);
 136         if (phy->type == USBPHY_INTERFACE_MODE_HSIC) {
 137                 phy->clk = devm_clk_get(dev, "hsic_480M");
 138                 if (IS_ERR(phy->clk)) {
 139                         dev_err(dev, "failed to get hsic_480M clock\n");
 140                         return PTR_ERR(phy->clk);
 141                 }
 142
 143                 phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
 144                 if (IS_ERR(phy->clk)) {
 145                         dev_err(dev, "failed to get hsic_12M clock\n");
 146                         return PTR_ERR(phy->clk);
 147                 }
 148
 149                 phy->reset = devm_reset_control_get(dev, "hsic");
 150                 if (IS_ERR(phy->reset)) {
 151                         dev_err(dev, "failed to get reset control\n");
 152                         return PTR_ERR(phy->reset);
 153                 }
 154         } else {
 155                 phy->clk = devm_clk_get(dev, "phy");
 156                 if (IS_ERR(phy->clk)) {
 157                         dev_err(dev, "failed to get phy clock\n");
 158                         return PTR_ERR(phy->clk);
 159                 }
 160
 161                 phy->reset = devm_reset_control_get(dev, "phy");
 162                 if (IS_ERR(phy->reset)) {
 163                         dev_err(dev, "failed to get reset control\n");
 164                         return PTR_ERR(phy->reset);
 165                 }
 166         }
 167
 168         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 169         phy->pmu = devm_ioremap_resource(dev, res);
 170         if (IS_ERR(phy->pmu))
 171                 return PTR_ERR(phy->pmu);
 172
 173         phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops);
 174         if (IS_ERR(phy->phy)) {
 175                 dev_err(dev, "failed to create PHY\n");
 176                 return PTR_ERR(phy->phy);
 177         }
 178
 179         phy_set_drvdata(phy->phy, phy);
 180         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 181
 182         return PTR_ERR_OR_ZERO(phy_provider);
 183 }
 184
 185 static const struct of_device_id sun9i_usb_phy_of_match[] = {
 186         { .compatible = "allwinner,sun9i-a80-usb-phy" },
 187         { },
 188 };
 189 MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);
 190
 191 static struct platform_driver sun9i_usb_phy_driver = {
 192         .probe  = sun9i_usb_phy_probe,
 193         .driver = {
 194                 .of_match_table = sun9i_usb_phy_of_match,
 195                 .name  = "sun9i-usb-phy",
 196         }
 197 };
 198 module_platform_driver(sun9i_usb_phy_driver);
 199
 200 MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");
 201 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
 202 MODULE_LICENSE("GPL");