drivers/phy/ti/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/mfd/syscon.h>
  33 #include <linux/regmap.h>
  34 #include <linux/of_platform.h>
  35
  36 #define USB2PHY_DISCON_BYP_LATCH (1 << 31)
  37 #define USB2PHY_ANA_CONFIG1 0x4c
  38
  39 #define AM654_USB2_OTG_PD               BIT(8)
  40 #define AM654_USB2_VBUS_DET_EN          BIT(5)
  41 #define AM654_USB2_VBUSVALID_DET_EN     BIT(4)
  42
  43 /**
  44  * omap_usb2_set_comparator - links the comparator present in the sytem with
  45  *      this phy
  46  * @comparator - the companion phy(comparator) for this phy
  47  *
  48  * The phy companion driver should call this API passing the phy_companion
  49  * filled with set_vbus and start_srp to be used by usb phy.
  50  *
  51  * For use by phy companion driver
  52  */
  53 int omap_usb2_set_comparator(struct phy_companion *comparator)
  54 {
  55         struct omap_usb *phy;
  56         struct usb_phy  *x = usb_get_phy(USB_PHY_TYPE_USB2);
  57
  58         if (IS_ERR(x))
  59                 return -ENODEV;
  60
  61         phy = phy_to_omapusb(x);
  62         phy->comparator = comparator;
  63         return 0;
  64 }
  65 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
  66
  67 static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
  68 {
  69         struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
  70
  71         if (!phy->comparator)
  72                 return -ENODEV;
  73
  74         return phy->comparator->set_vbus(phy->comparator, enabled);
  75 }
  76
  77 static int omap_usb_start_srp(struct usb_otg *otg)
  78 {
  79         struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
  80
  81         if (!phy->comparator)
  82                 return -ENODEV;
  83
  84         return phy->comparator->start_srp(phy->comparator);
  85 }
  86
  87 static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
  88 {
  89         otg->host = host;
  90         if (!host)
  91                 otg->state = OTG_STATE_UNDEFINED;
  92
  93         return 0;
  94 }
  95
  96 static int omap_usb_set_peripheral(struct usb_otg *otg,
  97                 struct usb_gadget *gadget)
  98 {
  99         otg->gadget = gadget;
 100         if (!gadget)
 101                 otg->state = OTG_STATE_UNDEFINED;
 102
 103         return 0;
 104 }
 105
 106 static int omap_usb_phy_power(struct omap_usb *phy, int on)
 107 {
 108         u32 val;
 109         int ret;
 110
 111         if (!phy->syscon_phy_power) {
 112                 omap_control_phy_power(phy->control_dev, on);
 113                 return 0;
 114         }
 115
 116         if (on)
 117                 val = phy->power_on;
 118         else
 119                 val = phy->power_off;
 120
 121         ret = regmap_update_bits(phy->syscon_phy_power, phy->power_reg,
 122                                  phy->mask, val);
 123         return ret;
 124 }
 125
 126 static int omap_usb_power_off(struct phy *x)
 127 {
 128         struct omap_usb *phy = phy_get_drvdata(x);
 129
 130         return omap_usb_phy_power(phy, false);
 131 }
 132
 133 static int omap_usb_power_on(struct phy *x)
 134 {
 135         struct omap_usb *phy = phy_get_drvdata(x);
 136
 137         return omap_usb_phy_power(phy, true);
 138 }
 139
 140 static int omap_usb2_disable_clocks(struct omap_usb *phy)
 141 {
 142         clk_disable_unprepare(phy->wkupclk);
 143         if (!IS_ERR(phy->optclk))
 144                 clk_disable_unprepare(phy->optclk);
 145
 146         return 0;
 147 }
 148
 149 static int omap_usb2_enable_clocks(struct omap_usb *phy)
 150 {
 151         int ret;
 152
 153         ret = clk_prepare_enable(phy->wkupclk);
 154         if (ret < 0) {
 155                 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
 156                 goto err0;
 157         }
 158
 159         if (!IS_ERR(phy->optclk)) {
 160                 ret = clk_prepare_enable(phy->optclk);
 161                 if (ret < 0) {
 162                         dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
 163                         goto err1;
 164                 }
 165         }
 166
 167         return 0;
 168
 169 err1:
 170         clk_disable(phy->wkupclk);
 171
 172 err0:
 173         return ret;
 174 }
 175
 176 static int omap_usb_init(struct phy *x)
 177 {
 178         struct omap_usb *phy = phy_get_drvdata(x);
 179         u32 val;
 180
 181         omap_usb2_enable_clocks(phy);
 182
 183         if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 184                 /*
 185                  *
 186                  * Reduce the sensitivity of internal PHY by enabling the
 187                  * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
 188                  * resolves issues with certain devices which can otherwise
 189                  * be prone to false disconnects.
 190                  *
 191                  */
 192                 val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
 193                 val |= USB2PHY_DISCON_BYP_LATCH;
 194                 omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
 195         }
 196
 197         return 0;
 198 }
 199
 200 static int omap_usb_exit(struct phy *x)
 201 {
 202         struct omap_usb *phy = phy_get_drvdata(x);
 203
 204         return omap_usb2_disable_clocks(phy);
 205 }
 206
 207 static const struct phy_ops ops = {
 208         .init           = omap_usb_init,
 209         .exit           = omap_usb_exit,
 210         .power_on       = omap_usb_power_on,
 211         .power_off      = omap_usb_power_off,
 212         .owner          = THIS_MODULE,
 213 };
 214
 215 static const struct usb_phy_data omap_usb2_data = {
 216         .label = "omap_usb2",
 217         .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
 218         .mask = OMAP_DEV_PHY_PD,
 219         .power_off = OMAP_DEV_PHY_PD,
 220 };
 221
 222 static const struct usb_phy_data omap5_usb2_data = {
 223         .label = "omap5_usb2",
 224         .flags = 0,
 225         .mask = OMAP_DEV_PHY_PD,
 226         .power_off = OMAP_DEV_PHY_PD,
 227 };
 228
 229 static const struct usb_phy_data dra7x_usb2_data = {
 230         .label = "dra7x_usb2",
 231         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 232         .mask = OMAP_DEV_PHY_PD,
 233         .power_off = OMAP_DEV_PHY_PD,
 234 };
 235
 236 static const struct usb_phy_data dra7x_usb2_phy2_data = {
 237         .label = "dra7x_usb2_phy2",
 238         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 239         .mask = OMAP_USB2_PHY_PD,
 240         .power_off = OMAP_USB2_PHY_PD,
 241 };
 242
 243 static const struct usb_phy_data am437x_usb2_data = {
 244         .label = "am437x_usb2",
 245         .flags =  0,
 246         .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
 247                 AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
 248         .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
 249         .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
 250 };
 251
 252 static const struct usb_phy_data am654_usb2_data = {
 253         .label = "am654_usb2",
 254         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 255         .mask = AM654_USB2_OTG_PD | AM654_USB2_VBUS_DET_EN |
 256                 AM654_USB2_VBUSVALID_DET_EN,
 257         .power_on = AM654_USB2_VBUS_DET_EN | AM654_USB2_VBUSVALID_DET_EN,
 258         .power_off = AM654_USB2_OTG_PD,
 259 };
 260
 261 static const struct of_device_id omap_usb2_id_table[] = {
 262         {
 263                 .compatible = "ti,omap-usb2",
 264                 .data = &omap_usb2_data,
 265         },
 266         {
 267                 .compatible = "ti,omap5-usb2",
 268                 .data = &omap5_usb2_data,
 269         },
 270         {
 271                 .compatible = "ti,dra7x-usb2",
 272                 .data = &dra7x_usb2_data,
 273         },
 274         {
 275                 .compatible = "ti,dra7x-usb2-phy2",
 276                 .data = &dra7x_usb2_phy2_data,
 277         },
 278         {
 279                 .compatible = "ti,am437x-usb2",
 280                 .data = &am437x_usb2_data,
 281         },
 282         {
 283                 .compatible = "ti,am654-usb2",
 284                 .data = &am654_usb2_data,
 285         },
 286         {},
 287 };
 288 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
 289
 290 static int omap_usb2_probe(struct platform_device *pdev)
 291 {
 292         struct omap_usb *phy;
 293         struct phy *generic_phy;
 294         struct resource *res;
 295         struct phy_provider *phy_provider;
 296         struct usb_otg *otg;
 297         struct device_node *node = pdev->dev.of_node;
 298         struct device_node *control_node;
 299         struct platform_device *control_pdev;
 300         const struct of_device_id *of_id;
 301         struct usb_phy_data *phy_data;
 302
 303         of_id = of_match_device(omap_usb2_id_table, &pdev->dev);
 304
 305         if (!of_id)
 306                 return -EINVAL;
 307
 308         phy_data = (struct usb_phy_data *)of_id->data;
 309
 310         phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 311         if (!phy)
 312                 return -ENOMEM;
 313
 314         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 315         if (!otg)
 316                 return -ENOMEM;
 317
 318         phy->dev                = &pdev->dev;
 319
 320         phy->phy.dev            = phy->dev;
 321         phy->phy.label          = phy_data->label;
 322         phy->phy.otg            = otg;
 323         phy->phy.type           = USB_PHY_TYPE_USB2;
 324         phy->mask               = phy_data->mask;
 325         phy->power_on           = phy_data->power_on;
 326         phy->power_off          = phy_data->power_off;
 327
 328         if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 329                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 330                 phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
 331                 if (IS_ERR(phy->phy_base))
 332                         return PTR_ERR(phy->phy_base);
 333                 phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
 334         }
 335
 336         phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
 337                                                         "syscon-phy-power");
 338         if (IS_ERR(phy->syscon_phy_power)) {
 339                 dev_dbg(&pdev->dev,
 340                         "can't get syscon-phy-power, using control device\n");
 341                 phy->syscon_phy_power = NULL;
 342
 343                 control_node = of_parse_phandle(node, "ctrl-module", 0);
 344                 if (!control_node) {
 345                         dev_err(&pdev->dev,
 346                                 "Failed to get control device phandle\n");
 347                         return -EINVAL;
 348                 }
 349
 350                 control_pdev = of_find_device_by_node(control_node);
 351                 if (!control_pdev) {
 352                         dev_err(&pdev->dev, "Failed to get control device\n");
 353                         return -EINVAL;
 354                 }
 355                 phy->control_dev = &control_pdev->dev;
 356         } else {
 357                 if (of_property_read_u32_index(node,
 358                                                "syscon-phy-power", 1,
 359                                                &phy->power_reg)) {
 360                         dev_err(&pdev->dev,
 361                                 "couldn't get power reg. offset\n");
 362                         return -EINVAL;
 363                 }
 364         }
 365
 366
 367         phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 368         if (IS_ERR(phy->wkupclk)) {
 369                 if (PTR_ERR(phy->wkupclk) == -EPROBE_DEFER)
 370                         return -EPROBE_DEFER;
 371
 372                 dev_warn(&pdev->dev, "unable to get wkupclk %ld, trying old name\n",
 373                          PTR_ERR(phy->wkupclk));
 374                 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
 375
 376                 if (IS_ERR(phy->wkupclk)) {
 377                         if (PTR_ERR(phy->wkupclk) != -EPROBE_DEFER)
 378                                 dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
 379                         return PTR_ERR(phy->wkupclk);
 380                 } else {
 381                         dev_warn(&pdev->dev,
 382                                  "found usb_phy_cm_clk32k, please fix DTS\n");
 383                 }
 384         }
 385
 386         phy->optclk = devm_clk_get(phy->dev, "refclk");
 387         if (IS_ERR(phy->optclk)) {
 388                 if (PTR_ERR(phy->optclk) == -EPROBE_DEFER)
 389                         return -EPROBE_DEFER;
 390
 391                 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
 392                 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
 393
 394                 if (IS_ERR(phy->optclk)) {
 395                         if (PTR_ERR(phy->optclk) != -EPROBE_DEFER) {
 396                                 dev_dbg(&pdev->dev,
 397                                         "unable to get usb_otg_ss_refclk960m\n");
 398                         }
 399                 } else {
 400                         dev_warn(&pdev->dev,
 401                                  "found usb_otg_ss_refclk960m, please fix DTS\n");
 402                 }
 403         }
 404
 405         otg->set_host = omap_usb_set_host;
 406         otg->set_peripheral = omap_usb_set_peripheral;
 407         if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
 408                 otg->set_vbus = omap_usb_set_vbus;
 409         if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
 410                 otg->start_srp = omap_usb_start_srp;
 411         otg->usb_phy = &phy->phy;
 412
 413         platform_set_drvdata(pdev, phy);
 414         pm_runtime_enable(phy->dev);
 415
 416         generic_phy = devm_phy_create(phy->dev, NULL, &ops);
 417         if (IS_ERR(generic_phy)) {
 418                 pm_runtime_disable(phy->dev);
 419                 return PTR_ERR(generic_phy);
 420         }
 421
 422         phy_set_drvdata(generic_phy, phy);
 423         omap_usb_power_off(generic_phy);
 424
 425         phy_provider = devm_of_phy_provider_register(phy->dev,
 426                                                      of_phy_simple_xlate);
 427         if (IS_ERR(phy_provider)) {
 428                 pm_runtime_disable(phy->dev);
 429                 return PTR_ERR(phy_provider);
 430         }
 431
 432
 433         usb_add_phy_dev(&phy->phy);
 434
 435         return 0;
 436 }
 437
 438 static int omap_usb2_remove(struct platform_device *pdev)
 439 {
 440         struct omap_usb *phy = platform_get_drvdata(pdev);
 441
 442         usb_remove_phy(&phy->phy);
 443         pm_runtime_disable(phy->dev);
 444
 445         return 0;
 446 }
 447
 448 static struct platform_driver omap_usb2_driver = {
 449         .probe          = omap_usb2_probe,
 450         .remove         = omap_usb2_remove,
 451         .driver         = {
 452                 .name   = "omap-usb2",
 453                 .of_match_table = omap_usb2_id_table,
 454         },
 455 };
 456
 457 module_platform_driver(omap_usb2_driver);
 458
 459 MODULE_ALIAS("platform:omap_usb2");
 460 MODULE_AUTHOR("Texas Instruments Inc.");
 461 MODULE_DESCRIPTION("OMAP USB2 phy driver");
 462 MODULE_LICENSE("GPL v2");