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