drivers/phy/ti/phy-da8xx-usb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * phy-da8xx-usb - TI DaVinci DA8xx USB PHY driver
   4  *
   5  * Copyright (C) 2016 David Lechner <david@lechnology.com>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/io.h>
  10 #include <linux/of.h>
  11 #include <linux/mfd/da8xx-cfgchip.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/module.h>
  14 #include <linux/phy/phy.h>
  15 #include <linux/platform_data/phy-da8xx-usb.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/regmap.h>
  19
  20 #define PHY_INIT_BITS   (CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN)
  21
  22 struct da8xx_usb_phy {
  23         struct device           *dev;
  24         struct phy_provider     *phy_provider;
  25         struct phy              *usb11_phy;
  26         struct phy              *usb20_phy;
  27         struct clk              *usb11_clk;
  28         struct clk              *usb20_clk;
  29         struct regmap           *regmap;
  30 };
  31
  32 static int da8xx_usb11_phy_power_on(struct phy *phy)
  33 {
  34         struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
  35         int ret;
  36
  37         ret = clk_prepare_enable(d_phy->usb11_clk);
  38         if (ret)
  39                 return ret;
  40
  41         regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM,
  42                           CFGCHIP2_USB1SUSPENDM);
  43
  44         /*
  45          * USB1.1 can used USB2.0 output clock as reference clock so this is here to prevent USB2.0
  46          * from shutting PHY's power when USB1.1 might use it
  47          */
  48         pm_runtime_get_sync(d_phy->dev);
  49
  50         return 0;
  51 }
  52
  53 static int da8xx_usb11_phy_power_off(struct phy *phy)
  54 {
  55         struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
  56
  57         regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 0);
  58
  59         clk_disable_unprepare(d_phy->usb11_clk);
  60         pm_runtime_put_sync(d_phy->dev);
  61
  62         return 0;
  63 }
  64
  65 static const struct phy_ops da8xx_usb11_phy_ops = {
  66         .power_on       = da8xx_usb11_phy_power_on,
  67         .power_off      = da8xx_usb11_phy_power_off,
  68         .owner          = THIS_MODULE,
  69 };
  70
  71 static int da8xx_usb20_phy_power_on(struct phy *phy)
  72 {
  73         struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
  74         int ret;
  75
  76         ret = clk_prepare_enable(d_phy->usb20_clk);
  77         if (ret)
  78                 return ret;
  79
  80         regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 0);
  81
  82         return 0;
  83 }
  84
  85 static int da8xx_usb20_phy_power_off(struct phy *phy)
  86 {
  87         struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
  88
  89         regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN,
  90                           CFGCHIP2_OTGPWRDN);
  91
  92         clk_disable_unprepare(d_phy->usb20_clk);
  93
  94         return 0;
  95 }
  96
  97 static int da8xx_usb20_phy_set_mode(struct phy *phy,
  98                                     enum phy_mode mode, int submode)
  99 {
 100         struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
 101         u32 val;
 102
 103         switch (mode) {
 104         case PHY_MODE_USB_HOST:         /* Force VBUS valid, ID = 0 */
 105                 val = CFGCHIP2_OTGMODE_FORCE_HOST;
 106                 break;
 107         case PHY_MODE_USB_DEVICE:       /* Force VBUS valid, ID = 1 */
 108                 val = CFGCHIP2_OTGMODE_FORCE_DEVICE;
 109                 break;
 110         case PHY_MODE_USB_OTG:  /* Don't override the VBUS/ID comparators */
 111                 val = CFGCHIP2_OTGMODE_NO_OVERRIDE;
 112                 break;
 113         default:
 114                 return -EINVAL;
 115         }
 116
 117         regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGMODE_MASK,
 118                           val);
 119
 120         return 0;
 121 }
 122
 123 static const struct phy_ops da8xx_usb20_phy_ops = {
 124         .power_on       = da8xx_usb20_phy_power_on,
 125         .power_off      = da8xx_usb20_phy_power_off,
 126         .set_mode       = da8xx_usb20_phy_set_mode,
 127         .owner          = THIS_MODULE,
 128 };
 129
 130 static int __maybe_unused da8xx_runtime_suspend(struct device *dev)
 131 {
 132         struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev);
 133
 134         dev_dbg(dev, "Suspending ...\n");
 135
 136         regmap_set_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN);
 137
 138         return 0;
 139 }
 140
 141 static int __maybe_unused da8xx_runtime_resume(struct device *dev)
 142 {
 143         u32 mask = CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN | CFGCHIP2_PHY_PLLON;
 144         struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev);
 145         u32 pll_status;
 146
 147         regmap_update_bits(d_phy->regmap, CFGCHIP(2), mask, CFGCHIP2_PHY_PLLON);
 148
 149         dev_dbg(dev, "Resuming ...\n");
 150
 151         return regmap_read_poll_timeout(d_phy->regmap, CFGCHIP(2), pll_status,
 152                                         pll_status & CFGCHIP2_PHYCLKGD, 1000, 500000);
 153 }
 154
 155 static const struct dev_pm_ops da8xx_usb_phy_pm_ops = {
 156         SET_RUNTIME_PM_OPS(da8xx_runtime_suspend, da8xx_runtime_resume, NULL)
 157 };
 158
 159 static struct phy *da8xx_usb_phy_of_xlate(struct device *dev,
 160                                          const struct of_phandle_args *args)
 161 {
 162         struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev);
 163
 164         if (!d_phy)
 165                 return ERR_PTR(-ENODEV);
 166
 167         switch (args->args[0]) {
 168         case 0:
 169                 return d_phy->usb20_phy;
 170         case 1:
 171                 return d_phy->usb11_phy;
 172         default:
 173                 return ERR_PTR(-EINVAL);
 174         }
 175 }
 176
 177 static int da8xx_usb_phy_probe(struct platform_device *pdev)
 178 {
 179         struct device           *dev = &pdev->dev;
 180         struct da8xx_usb_phy_platform_data *pdata = dev->platform_data;
 181         struct device_node      *node = dev->of_node;
 182         struct da8xx_usb_phy    *d_phy;
 183
 184         d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL);
 185         if (!d_phy)
 186                 return -ENOMEM;
 187
 188         d_phy->dev = dev;
 189
 190         if (pdata)
 191                 d_phy->regmap = pdata->cfgchip;
 192         else
 193                 d_phy->regmap = syscon_regmap_lookup_by_compatible(
 194                                                         "ti,da830-cfgchip");
 195         if (IS_ERR(d_phy->regmap)) {
 196                 dev_err(dev, "Failed to get syscon\n");
 197                 return PTR_ERR(d_phy->regmap);
 198         }
 199
 200         d_phy->usb11_clk = devm_clk_get(dev, "usb1_clk48");
 201         if (IS_ERR(d_phy->usb11_clk)) {
 202                 dev_err(dev, "Failed to get usb1_clk48\n");
 203                 return PTR_ERR(d_phy->usb11_clk);
 204         }
 205
 206         d_phy->usb20_clk = devm_clk_get(dev, "usb0_clk48");
 207         if (IS_ERR(d_phy->usb20_clk)) {
 208                 dev_err(dev, "Failed to get usb0_clk48\n");
 209                 return PTR_ERR(d_phy->usb20_clk);
 210         }
 211
 212         d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops);
 213         if (IS_ERR(d_phy->usb11_phy)) {
 214                 dev_err(dev, "Failed to create usb11 phy\n");
 215                 return PTR_ERR(d_phy->usb11_phy);
 216         }
 217
 218         d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops);
 219         if (IS_ERR(d_phy->usb20_phy)) {
 220                 dev_err(dev, "Failed to create usb20 phy\n");
 221                 return PTR_ERR(d_phy->usb20_phy);
 222         }
 223
 224         platform_set_drvdata(pdev, d_phy);
 225         phy_set_drvdata(d_phy->usb11_phy, d_phy);
 226         phy_set_drvdata(d_phy->usb20_phy, d_phy);
 227
 228         if (node) {
 229                 d_phy->phy_provider = devm_of_phy_provider_register(dev,
 230                                                         da8xx_usb_phy_of_xlate);
 231                 if (IS_ERR(d_phy->phy_provider)) {
 232                         dev_err(dev, "Failed to create phy provider\n");
 233                         return PTR_ERR(d_phy->phy_provider);
 234                 }
 235         } else {
 236                 int ret;
 237
 238                 ret = phy_create_lookup(d_phy->usb11_phy, "usb-phy",
 239                                         "ohci-da8xx");
 240                 if (ret)
 241                         dev_warn(dev, "Failed to create usb11 phy lookup\n");
 242                 ret = phy_create_lookup(d_phy->usb20_phy, "usb-phy",
 243                                         "musb-da8xx");
 244                 if (ret)
 245                         dev_warn(dev, "Failed to create usb20 phy lookup\n");
 246         }
 247
 248         regmap_write_bits(d_phy->regmap, CFGCHIP(2),
 249                           PHY_INIT_BITS, PHY_INIT_BITS);
 250
 251         pm_runtime_set_active(dev);
 252         devm_pm_runtime_enable(dev);
 253         /*
 254          * Prevent runtime pm from being ON by default. Users can enable
 255          * it using power/control in sysfs.
 256          */
 257         pm_runtime_forbid(dev);
 258
 259         return 0;
 260 }
 261
 262 static void da8xx_usb_phy_remove(struct platform_device *pdev)
 263 {
 264         struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev);
 265
 266         if (!pdev->dev.of_node) {
 267                 phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx");
 268                 phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci-da8xx");
 269         }
 270 }
 271
 272 static const struct of_device_id da8xx_usb_phy_ids[] = {
 273         { .compatible = "ti,da830-usb-phy" },
 274         { }
 275 };
 276 MODULE_DEVICE_TABLE(of, da8xx_usb_phy_ids);
 277
 278 static struct platform_driver da8xx_usb_phy_driver = {
 279         .probe  = da8xx_usb_phy_probe,
 280         .remove = da8xx_usb_phy_remove,
 281         .driver = {
 282                 .name   = "da8xx-usb-phy",
 283                 .pm     = &da8xx_usb_phy_pm_ops,
 284                 .of_match_table = da8xx_usb_phy_ids,
 285         },
 286 };
 287
 288 module_platform_driver(da8xx_usb_phy_driver);
 289
 290 MODULE_ALIAS("platform:da8xx-usb-phy");
 291 MODULE_AUTHOR("David Lechner <david@lechnology.com>");
 292 MODULE_DESCRIPTION("TI DA8xx USB PHY driver");
 293 MODULE_LICENSE("GPL v2");