drivers/phy/phy-rockchip-usb.c

   1 /*
   2  * Rockchip usb PHY driver
   3  *
   4  * Copyright (C) 2014 Yunzhi Li <lyz@rock-chips.com>
   5  * Copyright (C) 2014 ROCKCHIP, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/io.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/mutex.h>
  22 #include <linux/of.h>
  23 #include <linux/of_address.h>
  24 #include <linux/of_platform.h>
  25 #include <linux/phy/phy.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/regulator/consumer.h>
  28 #include <linux/reset.h>
  29 #include <linux/regmap.h>
  30 #include <linux/mfd/syscon.h>
  31
  32 /*
  33  * The higher 16-bit of this register is used for write protection
  34  * only if BIT(13 + 16) set to 1 the BIT(13) can be written.
  35  */
  36 #define SIDDQ_WRITE_ENA BIT(29)
  37 #define SIDDQ_ON                BIT(13)
  38 #define SIDDQ_OFF               (0 << 13)
  39
  40 struct rockchip_usb_phy {
  41         unsigned int    reg_offset;
  42         struct regmap   *reg_base;
  43         struct clk      *clk;
  44         struct phy      *phy;
  45         int (*rk_usb_phy_power)(struct rockchip_usb_phy *phy, bool on);
  46 };
  47
  48 static int rk32_usb_phy_power(struct rockchip_usb_phy *phy,
  49                               bool on)
  50 {
  51         /* Power down usb phy analog blocks by set siddq 1 */
  52         bool siddq = !on;
  53
  54         return regmap_write(phy->reg_base, phy->reg_offset,
  55                             SIDDQ_WRITE_ENA | (siddq ? SIDDQ_ON : SIDDQ_OFF));
  56 }
  57
  58 static int rk33_usb_phy_power(struct rockchip_usb_phy *phy,
  59                               bool on)
  60 {
  61         if (on)
  62                 return regmap_write(phy->reg_base, phy->reg_offset, 0xffff0000);
  63         else
  64                 return regmap_write(phy->reg_base, phy->reg_offset, 0xffff01d5);
  65 }
  66
  67 static int rockchip_usb_phy_power_off(struct phy *_phy)
  68 {
  69         struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
  70         int ret = 0;
  71
  72         ret = phy->rk_usb_phy_power(phy, 0);
  73         if (ret)
  74                 return ret;
  75
  76         clk_disable_unprepare(phy->clk);
  77         if (ret)
  78                 return ret;
  79
  80         return 0;
  81 }
  82
  83 static int rockchip_usb_phy_power_on(struct phy *_phy)
  84 {
  85         struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
  86         int ret = 0;
  87
  88         ret = clk_prepare_enable(phy->clk);
  89         if (ret)
  90                 return ret;
  91
  92         /* Power up usb phy analog blocks by set siddq 0 */
  93         ret = phy->rk_usb_phy_power(phy, 1);
  94         if (ret)
  95                 return ret;
  96
  97         return 0;
  98 }
  99
 100 static struct phy_ops ops = {
 101         .power_on       = rockchip_usb_phy_power_on,
 102         .power_off      = rockchip_usb_phy_power_off,
 103         .owner          = THIS_MODULE,
 104 };
 105
 106 static const struct of_device_id rockchip_usb_phy_dt_ids[] = {
 107         {
 108                 .compatible = "rockchip,rk3288-usb-phy",
 109                 .data = (void *)rk32_usb_phy_power
 110         },
 111         {
 112                 .compatible = "rockchip,rk3368-usb-phy",
 113                 .data = (void *)rk33_usb_phy_power
 114         },
 115         {}
 116 };
 117
 118 static int rockchip_usb_phy_probe(struct platform_device *pdev)
 119 {
 120         struct device *dev = &pdev->dev;
 121         struct rockchip_usb_phy *rk_phy;
 122         struct phy_provider *phy_provider;
 123         struct device_node *child;
 124         struct regmap *grf;
 125         const struct of_device_id *match;
 126         unsigned int reg_offset;
 127         int (*rk_usb_phy_power)(struct rockchip_usb_phy *phy, bool siddq);
 128
 129         grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
 130         if (IS_ERR(grf)) {
 131                 dev_err(&pdev->dev, "Missing rockchip,grf property\n");
 132                 return PTR_ERR(grf);
 133         }
 134
 135         match = of_match_device(rockchip_usb_phy_dt_ids, &pdev->dev);
 136         if (match && match->data)
 137                 rk_usb_phy_power = match->data;
 138         else
 139                 return PTR_ERR(match);
 140
 141         for_each_available_child_of_node(dev->of_node, child) {
 142                 rk_phy = devm_kzalloc(dev, sizeof(*rk_phy), GFP_KERNEL);
 143                 if (!rk_phy)
 144                         return -ENOMEM;
 145
 146                 if (of_property_read_u32(child, "reg", &reg_offset)) {
 147                         dev_err(dev, "missing reg property in node %s\n",
 148                                 child->name);
 149                         return -EINVAL;
 150                 }
 151
 152                 rk_phy->rk_usb_phy_power = rk_usb_phy_power;
 153                 rk_phy->reg_offset = reg_offset;
 154                 rk_phy->reg_base = grf;
 155
 156                 rk_phy->clk = of_clk_get_by_name(child, "phyclk");
 157                 if (IS_ERR(rk_phy->clk))
 158                         rk_phy->clk = NULL;
 159
 160                 rk_phy->phy = devm_phy_create(dev, child, &ops);
 161                 if (IS_ERR(rk_phy->phy)) {
 162                         dev_err(dev, "failed to create PHY\n");
 163                         return PTR_ERR(rk_phy->phy);
 164                 }
 165                 phy_set_drvdata(rk_phy->phy, rk_phy);
 166         }
 167
 168         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 169         if (IS_ERR(phy_provider))
 170                 return (long)phy_provider;
 171         else
 172                 return 0;
 173 }
 174
 175 MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids);
 176
 177 static struct platform_driver rockchip_usb_driver = {
 178         .probe          = rockchip_usb_phy_probe,
 179         .driver         = {
 180                 .name   = "rockchip-usb-phy",
 181                 .owner  = THIS_MODULE,
 182                 .of_match_table = rockchip_usb_phy_dt_ids,
 183         },
 184 };
 185
 186 module_platform_driver(rockchip_usb_driver);
 187
 188 MODULE_AUTHOR("Yunzhi Li <lyz@rock-chips.com>");
 189 MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver");
 190 MODULE_LICENSE("GPL v2");