kernel/drivers/phy/phy-omap-usb2.c

   1 /*
   2  * omap-usb2.c - USB PHY, talking to musb controller in OMAP.
   3  *
   4  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/slab.h>
  22 #include <linux/of.h>
  23 #include <linux/io.h>
  24 #include <linux/phy/omap_usb.h>
  25 #include <linux/usb/phy_companion.h>
  26 #include <linux/clk.h>
  27 #include <linux/err.h>
  28 #include <linux/pm_runtime.h>
  29 #include <linux/delay.h>
  30 #include <linux/phy/omap_control_phy.h>
  31 #include <linux/phy/phy.h>
  32 #include <linux/of_platform.h>
  33
  34 #define USB2PHY_DISCON_BYP_LATCH (1 << 31)
  35 #define USB2PHY_ANA_CONFIG1 0x4c
  36
  37 /**
  38  * omap_usb2_set_comparator - links the comparator present in the sytem with
  39  *      this phy
  40  * @comparator - the companion phy(comparator) for this phy
  41  *
  42  * The phy companion driver should call this API passing the phy_companion
  43  * filled with set_vbus and start_srp to be used by usb phy.
  44  *
  45  * For use by phy companion driver
  46  */
  47 int omap_usb2_set_comparator(struct phy_companion *comparator)
  48 {
  49         struct omap_usb *phy;
  50         struct usb_phy  *x = usb_get_phy(USB_PHY_TYPE_USB2);
  51
  52         if (IS_ERR(x))
  53                 return -ENODEV;
  54
  55         phy = phy_to_omapusb(x);
  56         phy->comparator = comparator;
  57         return 0;
  58 }
  59 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
  60
  61 static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
  62 {
  63         struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
  64
  65         if (!phy->comparator)
  66                 return -ENODEV;
  67
  68         return phy->comparator->set_vbus(phy->comparator, enabled);
  69 }
  70
  71 static int omap_usb_start_srp(struct usb_otg *otg)
  72 {
  73         struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
  74
  75         if (!phy->comparator)
  76                 return -ENODEV;
  77
  78         return phy->comparator->start_srp(phy->comparator);
  79 }
  80
  81 static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
  82 {
  83         otg->host = host;
  84         if (!host)
  85                 otg->state = OTG_STATE_UNDEFINED;
  86
  87         return 0;
  88 }
  89
  90 static int omap_usb_set_peripheral(struct usb_otg *otg,
  91                 struct usb_gadget *gadget)
  92 {
  93         otg->gadget = gadget;
  94         if (!gadget)
  95                 otg->state = OTG_STATE_UNDEFINED;
  96
  97         return 0;
  98 }
  99
 100 static int omap_usb_power_off(struct phy *x)
 101 {
 102         struct omap_usb *phy = phy_get_drvdata(x);
 103
 104         omap_control_phy_power(phy->control_dev, 0);
 105
 106         return 0;
 107 }
 108
 109 static int omap_usb_power_on(struct phy *x)
 110 {
 111         struct omap_usb *phy = phy_get_drvdata(x);
 112
 113         omap_control_phy_power(phy->control_dev, 1);
 114
 115         return 0;
 116 }
 117
 118 static int omap_usb_init(struct phy *x)
 119 {
 120         struct omap_usb *phy = phy_get_drvdata(x);
 121         u32 val;
 122
 123         if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 124                 /*
 125                  *
 126                  * Reduce the sensitivity of internal PHY by enabling the
 127                  * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
 128                  * resolves issues with certain devices which can otherwise
 129                  * be prone to false disconnects.
 130                  *
 131                  */
 132                 val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
 133                 val |= USB2PHY_DISCON_BYP_LATCH;
 134                 omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
 135         }
 136
 137         return 0;
 138 }
 139
 140 static struct phy_ops ops = {
 141         .init           = omap_usb_init,
 142         .power_on       = omap_usb_power_on,
 143         .power_off      = omap_usb_power_off,
 144         .owner          = THIS_MODULE,
 145 };
 146
 147 static const struct usb_phy_data omap_usb2_data = {
 148         .label = "omap_usb2",
 149         .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
 150 };
 151
 152 static const struct usb_phy_data omap5_usb2_data = {
 153         .label = "omap5_usb2",
 154         .flags = 0,
 155 };
 156
 157 static const struct usb_phy_data dra7x_usb2_data = {
 158         .label = "dra7x_usb2",
 159         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 160 };
 161
 162 static const struct usb_phy_data am437x_usb2_data = {
 163         .label = "am437x_usb2",
 164         .flags =  0,
 165 };
 166
 167 static const struct of_device_id omap_usb2_id_table[] = {
 168         {
 169                 .compatible = "ti,omap-usb2",
 170                 .data = &omap_usb2_data,
 171         },
 172         {
 173                 .compatible = "ti,omap5-usb2",
 174                 .data = &omap5_usb2_data,
 175         },
 176         {
 177                 .compatible = "ti,dra7x-usb2",
 178                 .data = &dra7x_usb2_data,
 179         },
 180         {
 181                 .compatible = "ti,am437x-usb2",
 182                 .data = &am437x_usb2_data,
 183         },
 184         {},
 185 };
 186 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
 187
 188 static int omap_usb2_probe(struct platform_device *pdev)
 189 {
 190         struct omap_usb *phy;
 191         struct phy *generic_phy;
 192         struct resource *res;
 193         struct phy_provider *phy_provider;
 194         struct usb_otg *otg;
 195         struct device_node *node = pdev->dev.of_node;
 196         struct device_node *control_node;
 197         struct platform_device *control_pdev;
 198         const struct of_device_id *of_id;
 199         struct usb_phy_data *phy_data;
 200
 201         of_id = of_match_device(omap_usb2_id_table, &pdev->dev);
 202
 203         if (!of_id)
 204                 return -EINVAL;
 205
 206         phy_data = (struct usb_phy_data *)of_id->data;
 207
 208         phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 209         if (!phy)
 210                 return -ENOMEM;
 211
 212         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 213         if (!otg)
 214                 return -ENOMEM;
 215
 216         phy->dev                = &pdev->dev;
 217
 218         phy->phy.dev            = phy->dev;
 219         phy->phy.label          = phy_data->label;
 220         phy->phy.otg            = otg;
 221         phy->phy.type           = USB_PHY_TYPE_USB2;
 222
 223         if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 224                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 225                 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
 226                 if (IS_ERR(phy->phy_base))
 227                         return PTR_ERR(phy->phy_base);
 228                 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
 229         }
 230
 231         control_node = of_parse_phandle(node, "ctrl-module", 0);
 232         if (!control_node) {
 233                 dev_err(&pdev->dev, "Failed to get control device phandle\n");
 234                 return -EINVAL;
 235         }
 236
 237         control_pdev = of_find_device_by_node(control_node);
 238         if (!control_pdev) {
 239                 dev_err(&pdev->dev, "Failed to get control device\n");
 240                 return -EINVAL;
 241         }
 242
 243         phy->control_dev = &control_pdev->dev;
 244         omap_control_phy_power(phy->control_dev, 0);
 245
 246         otg->set_host           = omap_usb_set_host;
 247         otg->set_peripheral     = omap_usb_set_peripheral;
 248         if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
 249                 otg->set_vbus           = omap_usb_set_vbus;
 250         if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
 251                 otg->start_srp          = omap_usb_start_srp;
 252         otg->usb_phy            = &phy->phy;
 253
 254         platform_set_drvdata(pdev, phy);
 255         pm_runtime_enable(phy->dev);
 256
 257         generic_phy = devm_phy_create(phy->dev, NULL, &ops);
 258         if (IS_ERR(generic_phy)) {
 259                 pm_runtime_disable(phy->dev);
 260                 return PTR_ERR(generic_phy);
 261         }
 262
 263         phy_set_drvdata(generic_phy, phy);
 264
 265         phy_provider = devm_of_phy_provider_register(phy->dev,
 266                         of_phy_simple_xlate);
 267         if (IS_ERR(phy_provider)) {
 268                 pm_runtime_disable(phy->dev);
 269                 return PTR_ERR(phy_provider);
 270         }
 271
 272         phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 273         if (IS_ERR(phy->wkupclk)) {
 274                 dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
 275                 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
 276                 if (IS_ERR(phy->wkupclk)) {
 277                         dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
 278                         pm_runtime_disable(phy->dev);
 279                         return PTR_ERR(phy->wkupclk);
 280                 } else {
 281                         dev_warn(&pdev->dev,
 282                                  "found usb_phy_cm_clk32k, please fix DTS\n");
 283                 }
 284         }
 285         clk_prepare(phy->wkupclk);
 286
 287         phy->optclk = devm_clk_get(phy->dev, "refclk");
 288         if (IS_ERR(phy->optclk)) {
 289                 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
 290                 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
 291                 if (IS_ERR(phy->optclk)) {
 292                         dev_dbg(&pdev->dev,
 293                                 "unable to get usb_otg_ss_refclk960m\n");
 294                 } else {
 295                         dev_warn(&pdev->dev,
 296                                  "found usb_otg_ss_refclk960m, please fix DTS\n");
 297                 }
 298         }
 299
 300         if (!IS_ERR(phy->optclk))
 301                 clk_prepare(phy->optclk);
 302
 303         usb_add_phy_dev(&phy->phy);
 304
 305         return 0;
 306 }
 307
 308 static int omap_usb2_remove(struct platform_device *pdev)
 309 {
 310         struct omap_usb *phy = platform_get_drvdata(pdev);
 311
 312         clk_unprepare(phy->wkupclk);
 313         if (!IS_ERR(phy->optclk))
 314                 clk_unprepare(phy->optclk);
 315         usb_remove_phy(&phy->phy);
 316         pm_runtime_disable(phy->dev);
 317
 318         return 0;
 319 }
 320
 321 #ifdef CONFIG_PM
 322
 323 static int omap_usb2_runtime_suspend(struct device *dev)
 324 {
 325         struct platform_device  *pdev = to_platform_device(dev);
 326         struct omap_usb *phy = platform_get_drvdata(pdev);
 327
 328         clk_disable(phy->wkupclk);
 329         if (!IS_ERR(phy->optclk))
 330                 clk_disable(phy->optclk);
 331
 332         return 0;
 333 }
 334
 335 static int omap_usb2_runtime_resume(struct device *dev)
 336 {
 337         struct platform_device  *pdev = to_platform_device(dev);
 338         struct omap_usb *phy = platform_get_drvdata(pdev);
 339         int ret;
 340
 341         ret = clk_enable(phy->wkupclk);
 342         if (ret < 0) {
 343                 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
 344                 goto err0;
 345         }
 346
 347         if (!IS_ERR(phy->optclk)) {
 348                 ret = clk_enable(phy->optclk);
 349                 if (ret < 0) {
 350                         dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
 351                         goto err1;
 352                 }
 353         }
 354
 355         return 0;
 356
 357 err1:
 358         clk_disable(phy->wkupclk);
 359
 360 err0:
 361         return ret;
 362 }
 363
 364 static const struct dev_pm_ops omap_usb2_pm_ops = {
 365         SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
 366                 NULL)
 367 };
 368
 369 #define DEV_PM_OPS     (&omap_usb2_pm_ops)
 370 #else
 371 #define DEV_PM_OPS     NULL
 372 #endif
 373
 374 static struct platform_driver omap_usb2_driver = {
 375         .probe          = omap_usb2_probe,
 376         .remove         = omap_usb2_remove,
 377         .driver         = {
 378                 .name   = "omap-usb2",
 379                 .pm     = DEV_PM_OPS,
 380                 .of_match_table = omap_usb2_id_table,
 381         },
 382 };
 383
 384 module_platform_driver(omap_usb2_driver);
 385
 386 MODULE_ALIAS("platform:omap_usb2");
 387 MODULE_AUTHOR("Texas Instruments Inc.");
 388 MODULE_DESCRIPTION("OMAP USB2 phy driver");
 389 MODULE_LICENSE("GPL v2");