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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * omap-usb2.c - USB PHY, talking to USB controller on TI SoCs.
   4  *
   5  * Copyright (C) 2012-2020 Texas Instruments Incorporated - http://www.ti.com
   6  * Author: Kishon Vijay Abraham I <kishon@ti.com>
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/delay.h>
  11 #include <linux/err.h>
  12 #include <linux/io.h>
  13 #include <linux/mfd/syscon.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/phy/omap_control_phy.h>
  18 #include <linux/phy/omap_usb.h>
  19 #include <linux/phy/phy.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/property.h>
  23 #include <linux/regmap.h>
  24 #include <linux/slab.h>
  25 #include <linux/sys_soc.h>
  26 #include <linux/usb/phy_companion.h>
  27
  28 #define USB2PHY_ANA_CONFIG1             0x4c
  29 #define USB2PHY_DISCON_BYP_LATCH        BIT(31)
  30
  31 #define USB2PHY_CHRG_DET                        0x14
  32 #define USB2PHY_CHRG_DET_USE_CHG_DET_REG        BIT(29)
  33 #define USB2PHY_CHRG_DET_DIS_CHG_DET            BIT(28)
  34
  35 /* SoC Specific USB2_OTG register definitions */
  36 #define AM654_USB2_OTG_PD               BIT(8)
  37 #define AM654_USB2_VBUS_DET_EN          BIT(5)
  38 #define AM654_USB2_VBUSVALID_DET_EN     BIT(4)
  39
  40 #define OMAP_DEV_PHY_PD         BIT(0)
  41 #define OMAP_USB2_PHY_PD        BIT(28)
  42
  43 #define AM437X_USB2_PHY_PD              BIT(0)
  44 #define AM437X_USB2_OTG_PD              BIT(1)
  45 #define AM437X_USB2_OTGVDET_EN          BIT(19)
  46 #define AM437X_USB2_OTGSESSEND_EN       BIT(20)
  47
  48 /* Driver Flags */
  49 #define OMAP_USB2_HAS_START_SRP                 BIT(0)
  50 #define OMAP_USB2_HAS_SET_VBUS                  BIT(1)
  51 #define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT    BIT(2)
  52 #define OMAP_USB2_DISABLE_CHRG_DET              BIT(3)
  53
  54 struct omap_usb {
  55         struct usb_phy          phy;
  56         struct phy_companion    *comparator;
  57         void __iomem            *pll_ctrl_base;
  58         void __iomem            *phy_base;
  59         struct device           *dev;
  60         struct device           *control_dev;
  61         struct clk              *wkupclk;
  62         struct clk              *optclk;
  63         u8                      flags;
  64         struct regmap           *syscon_phy_power; /* ctrl. reg. acces */
  65         unsigned int            power_reg; /* power reg. index within syscon */
  66         u32                     mask;
  67         u32                     power_on;
  68         u32                     power_off;
  69 };
  70
  71 #define phy_to_omapusb(x)       container_of((x), struct omap_usb, phy)
  72
  73 struct usb_phy_data {
  74         const char *label;
  75         u8 flags;
  76         u32 mask;
  77         u32 power_on;
  78         u32 power_off;
  79 };
  80
  81 static inline u32 omap_usb_readl(void __iomem *addr, unsigned int offset)
  82 {
  83         return __raw_readl(addr + offset);
  84 }
  85
  86 static inline void omap_usb_writel(void __iomem *addr, unsigned int offset,
  87                                    u32 data)
  88 {
  89         __raw_writel(data, addr + offset);
  90 }
  91
  92 /**
  93  * omap_usb2_set_comparator() - links the comparator present in the system with this phy
  94  *
  95  * @comparator:  the companion phy(comparator) for this phy
  96  *
  97  * The phy companion driver should call this API passing the phy_companion
  98  * filled with set_vbus and start_srp to be used by usb phy.
  99  *
 100  * For use by phy companion driver
 101  */
 102 int omap_usb2_set_comparator(struct phy_companion *comparator)
 103 {
 104         struct omap_usb *phy;
 105         struct usb_phy  *x = usb_get_phy(USB_PHY_TYPE_USB2);
 106
 107         if (IS_ERR(x))
 108                 return -ENODEV;
 109
 110         phy = phy_to_omapusb(x);
 111         phy->comparator = comparator;
 112         return 0;
 113 }
 114 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
 115
 116 static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
 117 {
 118         struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
 119
 120         if (!phy->comparator || !phy->comparator->set_vbus)
 121                 return -ENODEV;
 122
 123         return phy->comparator->set_vbus(phy->comparator, enabled);
 124 }
 125
 126 static int omap_usb_start_srp(struct usb_otg *otg)
 127 {
 128         struct omap_usb *phy = phy_to_omapusb(otg->usb_phy);
 129
 130         if (!phy->comparator || !phy->comparator->start_srp)
 131                 return -ENODEV;
 132
 133         return phy->comparator->start_srp(phy->comparator);
 134 }
 135
 136 static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
 137 {
 138         otg->host = host;
 139         if (!host)
 140                 otg->state = OTG_STATE_UNDEFINED;
 141
 142         return 0;
 143 }
 144
 145 static int omap_usb_set_peripheral(struct usb_otg *otg,
 146                                    struct usb_gadget *gadget)
 147 {
 148         otg->gadget = gadget;
 149         if (!gadget)
 150                 otg->state = OTG_STATE_UNDEFINED;
 151
 152         return 0;
 153 }
 154
 155 static int omap_usb_phy_power(struct omap_usb *phy, int on)
 156 {
 157         u32 val;
 158         int ret;
 159
 160         if (!phy->syscon_phy_power) {
 161                 omap_control_phy_power(phy->control_dev, on);
 162                 return 0;
 163         }
 164
 165         if (on)
 166                 val = phy->power_on;
 167         else
 168                 val = phy->power_off;
 169
 170         ret = regmap_update_bits(phy->syscon_phy_power, phy->power_reg,
 171                                  phy->mask, val);
 172         return ret;
 173 }
 174
 175 static int omap_usb_power_off(struct phy *x)
 176 {
 177         struct omap_usb *phy = phy_get_drvdata(x);
 178
 179         return omap_usb_phy_power(phy, false);
 180 }
 181
 182 static int omap_usb_power_on(struct phy *x)
 183 {
 184         struct omap_usb *phy = phy_get_drvdata(x);
 185
 186         return omap_usb_phy_power(phy, true);
 187 }
 188
 189 static int omap_usb2_disable_clocks(struct omap_usb *phy)
 190 {
 191         clk_disable_unprepare(phy->wkupclk);
 192         if (!IS_ERR(phy->optclk))
 193                 clk_disable_unprepare(phy->optclk);
 194
 195         return 0;
 196 }
 197
 198 static int omap_usb2_enable_clocks(struct omap_usb *phy)
 199 {
 200         int ret;
 201
 202         ret = clk_prepare_enable(phy->wkupclk);
 203         if (ret < 0) {
 204                 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
 205                 goto err0;
 206         }
 207
 208         if (!IS_ERR(phy->optclk)) {
 209                 ret = clk_prepare_enable(phy->optclk);
 210                 if (ret < 0) {
 211                         dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
 212                         goto err1;
 213                 }
 214         }
 215
 216         return 0;
 217
 218 err1:
 219         clk_disable_unprepare(phy->wkupclk);
 220
 221 err0:
 222         return ret;
 223 }
 224
 225 static int omap_usb_init(struct phy *x)
 226 {
 227         struct omap_usb *phy = phy_get_drvdata(x);
 228         u32 val;
 229
 230         omap_usb2_enable_clocks(phy);
 231
 232         if (phy->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 233                 /*
 234                  *
 235                  * Reduce the sensitivity of internal PHY by enabling the
 236                  * DISCON_BYP_LATCH of the USB2PHY_ANA_CONFIG1 register. This
 237                  * resolves issues with certain devices which can otherwise
 238                  * be prone to false disconnects.
 239                  *
 240                  */
 241                 val = omap_usb_readl(phy->phy_base, USB2PHY_ANA_CONFIG1);
 242                 val |= USB2PHY_DISCON_BYP_LATCH;
 243                 omap_usb_writel(phy->phy_base, USB2PHY_ANA_CONFIG1, val);
 244         }
 245
 246         if (phy->flags & OMAP_USB2_DISABLE_CHRG_DET) {
 247                 val = omap_usb_readl(phy->phy_base, USB2PHY_CHRG_DET);
 248                 val |= USB2PHY_CHRG_DET_USE_CHG_DET_REG |
 249                        USB2PHY_CHRG_DET_DIS_CHG_DET;
 250                 omap_usb_writel(phy->phy_base, USB2PHY_CHRG_DET, val);
 251         }
 252
 253         return 0;
 254 }
 255
 256 static int omap_usb_exit(struct phy *x)
 257 {
 258         struct omap_usb *phy = phy_get_drvdata(x);
 259
 260         return omap_usb2_disable_clocks(phy);
 261 }
 262
 263 static const struct phy_ops ops = {
 264         .init           = omap_usb_init,
 265         .exit           = omap_usb_exit,
 266         .power_on       = omap_usb_power_on,
 267         .power_off      = omap_usb_power_off,
 268         .owner          = THIS_MODULE,
 269 };
 270
 271 static const struct usb_phy_data omap_usb2_data = {
 272         .label = "omap_usb2",
 273         .flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
 274         .mask = OMAP_DEV_PHY_PD,
 275         .power_off = OMAP_DEV_PHY_PD,
 276 };
 277
 278 static const struct usb_phy_data omap5_usb2_data = {
 279         .label = "omap5_usb2",
 280         .flags = 0,
 281         .mask = OMAP_DEV_PHY_PD,
 282         .power_off = OMAP_DEV_PHY_PD,
 283 };
 284
 285 static const struct usb_phy_data dra7x_usb2_data = {
 286         .label = "dra7x_usb2",
 287         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 288         .mask = OMAP_DEV_PHY_PD,
 289         .power_off = OMAP_DEV_PHY_PD,
 290 };
 291
 292 static const struct usb_phy_data dra7x_usb2_phy2_data = {
 293         .label = "dra7x_usb2_phy2",
 294         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 295         .mask = OMAP_USB2_PHY_PD,
 296         .power_off = OMAP_USB2_PHY_PD,
 297 };
 298
 299 static const struct usb_phy_data am437x_usb2_data = {
 300         .label = "am437x_usb2",
 301         .flags =  0,
 302         .mask = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD |
 303                 AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
 304         .power_on = AM437X_USB2_OTGVDET_EN | AM437X_USB2_OTGSESSEND_EN,
 305         .power_off = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD,
 306 };
 307
 308 static const struct usb_phy_data am654_usb2_data = {
 309         .label = "am654_usb2",
 310         .flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
 311         .mask = AM654_USB2_OTG_PD | AM654_USB2_VBUS_DET_EN |
 312                 AM654_USB2_VBUSVALID_DET_EN,
 313         .power_on = AM654_USB2_VBUS_DET_EN | AM654_USB2_VBUSVALID_DET_EN,
 314         .power_off = AM654_USB2_OTG_PD,
 315 };
 316
 317 static const struct of_device_id omap_usb2_id_table[] = {
 318         {
 319                 .compatible = "ti,omap-usb2",
 320                 .data = &omap_usb2_data,
 321         },
 322         {
 323                 .compatible = "ti,omap5-usb2",
 324                 .data = &omap5_usb2_data,
 325         },
 326         {
 327                 .compatible = "ti,dra7x-usb2",
 328                 .data = &dra7x_usb2_data,
 329         },
 330         {
 331                 .compatible = "ti,dra7x-usb2-phy2",
 332                 .data = &dra7x_usb2_phy2_data,
 333         },
 334         {
 335                 .compatible = "ti,am437x-usb2",
 336                 .data = &am437x_usb2_data,
 337         },
 338         {
 339                 .compatible = "ti,am654-usb2",
 340                 .data = &am654_usb2_data,
 341         },
 342         {},
 343 };
 344 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
 345
 346 static void omap_usb2_init_errata(struct omap_usb *phy)
 347 {
 348         static const struct soc_device_attribute am65x_sr10_soc_devices[] = {
 349                 { .family = "AM65X", .revision = "SR1.0" },
 350                 { /* sentinel */ }
 351         };
 352
 353         /*
 354          * Errata i2075: USB2PHY: USB2PHY Charger Detect is Enabled by
 355          * Default Without VBUS Presence.
 356          *
 357          * AM654x SR1.0 has a silicon bug due to which D+ is pulled high after
 358          * POR, which could cause enumeration failure with some USB hubs.
 359          * Disabling the USB2_PHY Charger Detect function will put D+
 360          * into the normal state.
 361          */
 362         if (soc_device_match(am65x_sr10_soc_devices))
 363                 phy->flags |= OMAP_USB2_DISABLE_CHRG_DET;
 364 }
 365
 366 static int omap_usb2_probe(struct platform_device *pdev)
 367 {
 368         struct omap_usb *phy;
 369         struct phy *generic_phy;
 370         struct phy_provider *phy_provider;
 371         struct usb_otg *otg;
 372         struct device_node *node = pdev->dev.of_node;
 373         struct device_node *control_node;
 374         struct platform_device *control_pdev;
 375         const struct usb_phy_data *phy_data;
 376
 377         phy_data = device_get_match_data(&pdev->dev);
 378         if (!phy_data)
 379                 return -EINVAL;
 380
 381         phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 382         if (!phy)
 383                 return -ENOMEM;
 384
 385         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 386         if (!otg)
 387                 return -ENOMEM;
 388
 389         phy->dev                = &pdev->dev;
 390
 391         phy->phy.dev            = phy->dev;
 392         phy->phy.label          = phy_data->label;
 393         phy->phy.otg            = otg;
 394         phy->phy.type           = USB_PHY_TYPE_USB2;
 395         phy->mask               = phy_data->mask;
 396         phy->power_on           = phy_data->power_on;
 397         phy->power_off          = phy_data->power_off;
 398         phy->flags              = phy_data->flags;
 399
 400         omap_usb2_init_errata(phy);
 401
 402         phy->phy_base = devm_platform_ioremap_resource(pdev, 0);
 403         if (IS_ERR(phy->phy_base))
 404                 return PTR_ERR(phy->phy_base);
 405
 406         phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
 407                                                                 "syscon-phy-power");
 408         if (IS_ERR(phy->syscon_phy_power)) {
 409                 dev_dbg(&pdev->dev,
 410                         "can't get syscon-phy-power, using control device\n");
 411                 phy->syscon_phy_power = NULL;
 412
 413                 control_node = of_parse_phandle(node, "ctrl-module", 0);
 414                 if (!control_node) {
 415                         dev_err(&pdev->dev,
 416                                 "Failed to get control device phandle\n");
 417                         return -EINVAL;
 418                 }
 419
 420                 control_pdev = of_find_device_by_node(control_node);
 421                 if (!control_pdev) {
 422                         dev_err(&pdev->dev, "Failed to get control device\n");
 423                         return -EINVAL;
 424                 }
 425                 phy->control_dev = &control_pdev->dev;
 426         } else {
 427                 if (of_property_read_u32_index(node,
 428                                                "syscon-phy-power", 1,
 429                                                &phy->power_reg)) {
 430                         dev_err(&pdev->dev,
 431                                 "couldn't get power reg. offset\n");
 432                         return -EINVAL;
 433                 }
 434         }
 435
 436         phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
 437         if (IS_ERR(phy->wkupclk)) {
 438                 if (PTR_ERR(phy->wkupclk) == -EPROBE_DEFER)
 439                         return -EPROBE_DEFER;
 440
 441                 dev_warn(&pdev->dev, "unable to get wkupclk %ld, trying old name\n",
 442                          PTR_ERR(phy->wkupclk));
 443                 phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
 444
 445                 if (IS_ERR(phy->wkupclk))
 446                         return dev_err_probe(&pdev->dev, PTR_ERR(phy->wkupclk),
 447                                              "unable to get usb_phy_cm_clk32k\n");
 448
 449                 dev_warn(&pdev->dev,
 450                          "found usb_phy_cm_clk32k, please fix DTS\n");
 451         }
 452
 453         phy->optclk = devm_clk_get(phy->dev, "refclk");
 454         if (IS_ERR(phy->optclk)) {
 455                 if (PTR_ERR(phy->optclk) == -EPROBE_DEFER)
 456                         return -EPROBE_DEFER;
 457
 458                 dev_dbg(&pdev->dev, "unable to get refclk, trying old name\n");
 459                 phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
 460
 461                 if (IS_ERR(phy->optclk)) {
 462                         if (PTR_ERR(phy->optclk) != -EPROBE_DEFER) {
 463                                 dev_dbg(&pdev->dev,
 464                                         "unable to get usb_otg_ss_refclk960m\n");
 465                         }
 466                 } else {
 467                         dev_warn(&pdev->dev,
 468                                  "found usb_otg_ss_refclk960m, please fix DTS\n");
 469                 }
 470         }
 471
 472         otg->set_host = omap_usb_set_host;
 473         otg->set_peripheral = omap_usb_set_peripheral;
 474         if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
 475                 otg->set_vbus = omap_usb_set_vbus;
 476         if (phy_data->flags & OMAP_USB2_HAS_START_SRP)
 477                 otg->start_srp = omap_usb_start_srp;
 478         otg->usb_phy = &phy->phy;
 479
 480         platform_set_drvdata(pdev, phy);
 481         pm_runtime_enable(phy->dev);
 482
 483         generic_phy = devm_phy_create(phy->dev, NULL, &ops);
 484         if (IS_ERR(generic_phy)) {
 485                 pm_runtime_disable(phy->dev);
 486                 return PTR_ERR(generic_phy);
 487         }
 488
 489         phy_set_drvdata(generic_phy, phy);
 490         omap_usb_power_off(generic_phy);
 491
 492         phy_provider = devm_of_phy_provider_register(phy->dev,
 493                                                      of_phy_simple_xlate);
 494         if (IS_ERR(phy_provider)) {
 495                 pm_runtime_disable(phy->dev);
 496                 return PTR_ERR(phy_provider);
 497         }
 498
 499         usb_add_phy_dev(&phy->phy);
 500
 501         return 0;
 502 }
 503
 504 static void omap_usb2_remove(struct platform_device *pdev)
 505 {
 506         struct omap_usb *phy = platform_get_drvdata(pdev);
 507
 508         usb_remove_phy(&phy->phy);
 509         pm_runtime_disable(phy->dev);
 510 }
 511
 512 static struct platform_driver omap_usb2_driver = {
 513         .probe          = omap_usb2_probe,
 514         .remove         = omap_usb2_remove,
 515         .driver         = {
 516                 .name   = "omap-usb2",
 517                 .of_match_table = omap_usb2_id_table,
 518         },
 519 };
 520
 521 module_platform_driver(omap_usb2_driver);
 522
 523 MODULE_ALIAS("platform:omap_usb2");
 524 MODULE_AUTHOR("Texas Instruments Inc.");
 525 MODULE_DESCRIPTION("OMAP USB2 phy driver");
 526 MODULE_LICENSE("GPL v2");