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->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->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         struct usb_phy  *phy = otg->phy;
  84
  85         otg->host = host;
  86         if (!host)
  87                 phy->state = OTG_STATE_UNDEFINED;
  88
  89         return 0;
  90 }
  91
  92 static int omap_usb_set_peripheral(struct usb_otg *otg,
  93                 struct usb_gadget *gadget)
  94 {
  95         struct usb_phy  *phy = otg->phy;
  96
  97         otg->gadget = gadget;
  98         if (!gadget)
  99                 phy->state = OTG_STATE_UNDEFINED;
 100
 101         return 0;
 102 }
 103
 104 static int omap_usb_power_off(struct phy *x)
 105 {
 106         struct omap_usb *phy = phy_get_drvdata(x);
 107
 108         omap_control_phy_power(phy->control_dev, 0);
 109
 110         return 0;
 111 }
 112
 113 static int omap_usb_power_on(struct phy *x)
 114 {
 115         struct omap_usb *phy = phy_get_drvdata(x);
 116
 117         omap_control_phy_power(phy->control_dev, 1);
 118
 119         return 0;
 120 }
 121
 122 static int omap_usb_init(struct phy *x)
 123 {
 124         struct omap_usb *phy = phy_get_drvdata(x);
 125         u32 val;
 126
 127         if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 128                 /*
 129                  *
 130                  * Reduce the sensitivity of internal PHY by enabling the
 131                  * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
 132                  * resolves issues with certain devices which can otherwise
 133                  * be prone to false disconnects.
 134                  *
 135                  */
 136                 val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
 137                 val |= USB2PHY_DISCON_BYP_LATCH;
 138                 omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
 139         }
 140
 141         return 0;
 142 }
 143
 144 static struct phy_ops ops = {
 145         .init           = omap_usb_init,
 146         .power_on       = omap_usb_power_on,
 147         .power_off      = omap_usb_power_off,
 148         .owner          = THIS_MODULE,
 149 };
 150
 151 #ifdef CONFIG_OF
 152 static const struct usb_phy_data omap_usb2_data = {
 153         .label = "omap_usb2",
 154         .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
 155 };
 156
 157 static const struct usb_phy_data omap5_usb2_data = {
 158         .label = "omap5_usb2",
 159         .flags = 0,
 160 };
 161
 162 static const struct usb_phy_data dra7x_usb2_data = {
 163         .label = "dra7x_usb2",
 164         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 165 };
 166
 167 static const struct usb_phy_data am437x_usb2_data = {
 168         .label = "am437x_usb2",
 169         .flags =  0,
 170 };
 171
 172 static const struct of_device_id omap_usb2_id_table[] = {
 173         {
 174                 .compatible = "ti,omap-usb2",
 175                 .data = &omap_usb2_data,
 176         },
 177         {
 178                 .compatible = "ti,omap5-usb2",
 179                 .data = &omap5_usb2_data,
 180         },
 181         {
 182                 .compatible = "ti,dra7x-usb2",
 183                 .data = &dra7x_usb2_data,
 184         },
 185         {
 186                 .compatible = "ti,am437x-usb2",
 187                 .data = &am437x_usb2_data,
 188         },
 189         {},
 190 };
 191 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
 192 #endif
 193
 194 static int omap_usb2_probe(struct platform_device *pdev)
 195 {
 196         struct omap_usb *phy;
 197         struct phy *generic_phy;
 198         struct resource *res;
 199         struct phy_provider *phy_provider;
 200         struct usb_otg *otg;
 201         struct device_node *node = pdev->dev.of_node;
 202         struct device_node *control_node;
 203         struct platform_device *control_pdev;
 204         const struct of_device_id *of_id;
 205         struct usb_phy_data *phy_data;
 206
 207         of_id = of_match_device(of_match_ptr(omap_usb2_id_table), &pdev->dev);
 208
 209         if (!of_id)
 210                 return -EINVAL;
 211
 212         phy_data = (struct usb_phy_data *)of_id->data;
 213
 214         phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 215         if (!phy)
 216                 return -ENOMEM;
 217
 218         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 219         if (!otg)
 220                 return -ENOMEM;
 221
 222         phy->dev                = &pdev->dev;
 223
 224         phy->phy.dev            = phy->dev;
 225         phy->phy.label          = phy_data->label;
 226         phy->phy.otg            = otg;
 227         phy->phy.type           = USB_PHY_TYPE_USB2;
 228
 229         if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 230                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 231                 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
 232                 if (IS_ERR(phy->phy_base))
 233                         return PTR_ERR(phy->phy_base);
 234                 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
 235         }
 236
 237         control_node = of_parse_phandle(node, "ctrl-module", 0);
 238         if (!control_node) {
 239                 dev_err(&pdev->dev, "Failed to get control device phandle\n");
 240                 return -EINVAL;
 241         }
 242
 243         control_pdev = of_find_device_by_node(control_node);
 244         if (!control_pdev) {
 245                 dev_err(&pdev->dev, "Failed to get control device\n");
 246                 return -EINVAL;
 247         }
 248
 249         phy->control_dev = &control_pdev->dev;
 250         omap_control_phy_power(phy->control_dev, 0);
 251
 252         otg->set_host           = omap_usb_set_host;
 253         otg->set_peripheral     = omap_usb_set_peripheral;
 254         if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
 255                 otg->set_vbus           = omap_usb_set_vbus;
 256         if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
 257                 otg->start_srp          = omap_usb_start_srp;
 258         otg->phy                = &phy->phy;
 259
 260         platform_set_drvdata(pdev, phy);
 261
 262         generic_phy = devm_phy_create(phy->dev, NULL, &ops, NULL);
 263         if (IS_ERR(generic_phy))
 264                 return PTR_ERR(generic_phy);
 265
 266         phy_set_drvdata(generic_phy, phy);
 267
 268         pm_runtime_enable(phy->dev);
 269         phy_provider = devm_of_phy_provider_register(phy->dev,
 270                         of_phy_simple_xlate);
 271         if (IS_ERR(phy_provider)) {
 272                 pm_runtime_disable(phy->dev);
 273                 return PTR_ERR(phy_provider);
 274         }
 275
 276         phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 277         if (IS_ERR(phy->wkupclk)) {
 278                 dev_warn(&pdev->dev, "unable to get wkupclk, trying old name\n");
 279                 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
 280                 if (IS_ERR(phy->wkupclk)) {
 281                         dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
 282                         return PTR_ERR(phy->wkupclk);
 283                 } else {
 284                         dev_warn(&pdev->dev,
 285                                  "found usb_phy_cm_clk32k, please fix DTS\n");
 286                 }
 287         }
 288         clk_prepare(phy->wkupclk);
 289
 290         phy->optclk = devm_clk_get(phy->dev, "refclk");
 291         if (IS_ERR(phy->optclk)) {
 292                 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
 293                 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
 294                 if (IS_ERR(phy->optclk)) {
 295                         dev_dbg(&pdev->dev,
 296                                 "unable to get usb_otg_ss_refclk960m\n");
 297                 } else {
 298                         dev_warn(&pdev->dev,
 299                                  "found usb_otg_ss_refclk960m, please fix DTS\n");
 300                 }
 301         } else {
 302                 clk_prepare(phy->optclk);
 303         }
 304
 305         usb_add_phy_dev(&phy->phy);
 306
 307         return 0;
 308 }
 309
 310 static int omap_usb2_remove(struct platform_device *pdev)
 311 {
 312         struct omap_usb *phy = platform_get_drvdata(pdev);
 313
 314         clk_unprepare(phy->wkupclk);
 315         if (!IS_ERR(phy->optclk))
 316                 clk_unprepare(phy->optclk);
 317         usb_remove_phy(&phy->phy);
 318         pm_runtime_disable(phy->dev);
 319
 320         return 0;
 321 }
 322
 323 #ifdef CONFIG_PM_RUNTIME
 324
 325 static int omap_usb2_runtime_suspend(struct device *dev)
 326 {
 327         struct platform_device  *pdev = to_platform_device(dev);
 328         struct omap_usb *phy = platform_get_drvdata(pdev);
 329
 330         clk_disable(phy->wkupclk);
 331         if (!IS_ERR(phy->optclk))
 332                 clk_disable(phy->optclk);
 333
 334         return 0;
 335 }
 336
 337 static int omap_usb2_runtime_resume(struct device *dev)
 338 {
 339         struct platform_device  *pdev = to_platform_device(dev);
 340         struct omap_usb *phy = platform_get_drvdata(pdev);
 341         int ret;
 342
 343         ret = clk_enable(phy->wkupclk);
 344         if (ret < 0) {
 345                 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
 346                 goto err0;
 347         }
 348
 349         if (!IS_ERR(phy->optclk)) {
 350                 ret = clk_enable(phy->optclk);
 351                 if (ret < 0) {
 352                         dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
 353                         goto err1;
 354                 }
 355         }
 356
 357         return 0;
 358
 359 err1:
 360         clk_disable(phy->wkupclk);
 361
 362 err0:
 363         return ret;
 364 }
 365
 366 static const struct dev_pm_ops omap_usb2_pm_ops = {
 367         SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
 368                 NULL)
 369 };
 370
 371 #define DEV_PM_OPS     (&omap_usb2_pm_ops)
 372 #else
 373 #define DEV_PM_OPS     NULL
 374 #endif
 375
 376 static struct platform_driver omap_usb2_driver = {
 377         .probe          = omap_usb2_probe,
 378         .remove         = omap_usb2_remove,
 379         .driver         = {
 380                 .name   = "omap-usb2",
 381                 .pm     = DEV_PM_OPS,
 382                 .of_match_table = of_match_ptr(omap_usb2_id_table),
 383         },
 384 };
 385
 386 module_platform_driver(omap_usb2_driver);
 387
 388 MODULE_ALIAS("platform: omap_usb2");
 389 MODULE_AUTHOR("Texas Instruments Inc.");
 390 MODULE_DESCRIPTION("OMAP USB2 phy driver");
 391 MODULE_LICENSE("GPL v2");