drivers/phy/motorola/phy-mapphone-mdm6600.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Motorola Mapphone MDM6600 modem GPIO controlled USB PHY driver
   4  * Copyright (C) 2018 Tony Lindgren <tony@atomide.com>
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/err.h>
   9 #include <linux/io.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/slab.h>
  15
  16 #include <linux/gpio/consumer.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/phy/phy.h>
  19 #include <linux/pinctrl/consumer.h>
  20
  21 #define PHY_MDM6600_PHY_DELAY_MS        4000    /* PHY enable 2.2s to 3.5s */
  22 #define PHY_MDM6600_ENABLED_DELAY_MS    8000    /* 8s more total for MDM6600 */
  23 #define MDM6600_MODEM_IDLE_DELAY_MS     1000    /* modem after USB suspend */
  24 #define MDM6600_MODEM_WAKE_DELAY_MS     200     /* modem response after idle */
  25
  26 enum phy_mdm6600_ctrl_lines {
  27         PHY_MDM6600_ENABLE,                     /* USB PHY enable */
  28         PHY_MDM6600_POWER,                      /* Device power */
  29         PHY_MDM6600_RESET,                      /* Device reset */
  30         PHY_MDM6600_NR_CTRL_LINES,
  31 };
  32
  33 enum phy_mdm6600_bootmode_lines {
  34         PHY_MDM6600_MODE0,                      /* out USB mode0 and OOB wake */
  35         PHY_MDM6600_MODE1,                      /* out USB mode1, in OOB wake */
  36         PHY_MDM6600_NR_MODE_LINES,
  37 };
  38
  39 enum phy_mdm6600_cmd_lines {
  40         PHY_MDM6600_CMD0,
  41         PHY_MDM6600_CMD1,
  42         PHY_MDM6600_CMD2,
  43         PHY_MDM6600_NR_CMD_LINES,
  44 };
  45
  46 enum phy_mdm6600_status_lines {
  47         PHY_MDM6600_STATUS0,
  48         PHY_MDM6600_STATUS1,
  49         PHY_MDM6600_STATUS2,
  50         PHY_MDM6600_NR_STATUS_LINES,
  51 };
  52
  53 /*
  54  * MDM6600 command codes. These are based on Motorola Mapphone Linux
  55  * kernel tree.
  56  */
  57 enum phy_mdm6600_cmd {
  58         PHY_MDM6600_CMD_BP_PANIC_ACK,
  59         PHY_MDM6600_CMD_DATA_ONLY_BYPASS,       /* Reroute USB to CPCAP PHY */
  60         PHY_MDM6600_CMD_FULL_BYPASS,            /* Reroute USB to CPCAP PHY */
  61         PHY_MDM6600_CMD_NO_BYPASS,              /* Request normal USB mode */
  62         PHY_MDM6600_CMD_BP_SHUTDOWN_REQ,        /* Request device power off */
  63         PHY_MDM6600_CMD_BP_UNKNOWN_5,
  64         PHY_MDM6600_CMD_BP_UNKNOWN_6,
  65         PHY_MDM6600_CMD_UNDEFINED,
  66 };
  67
  68 /*
  69  * MDM6600 status codes. These are based on Motorola Mapphone Linux
  70  * kernel tree.
  71  */
  72 enum phy_mdm6600_status {
  73         PHY_MDM6600_STATUS_PANIC,               /* Seems to be really off */
  74         PHY_MDM6600_STATUS_PANIC_BUSY_WAIT,
  75         PHY_MDM6600_STATUS_QC_DLOAD,
  76         PHY_MDM6600_STATUS_RAM_DOWNLOADER,      /* MDM6600 USB flashing mode */
  77         PHY_MDM6600_STATUS_PHONE_CODE_AWAKE,    /* MDM6600 normal USB mode */
  78         PHY_MDM6600_STATUS_PHONE_CODE_ASLEEP,
  79         PHY_MDM6600_STATUS_SHUTDOWN_ACK,
  80         PHY_MDM6600_STATUS_UNDEFINED,
  81 };
  82
  83 static const char * const
  84 phy_mdm6600_status_name[] = {
  85         "off", "busy", "qc_dl", "ram_dl", "awake",
  86         "asleep", "shutdown", "undefined",
  87 };
  88
  89 struct phy_mdm6600 {
  90         struct device *dev;
  91         struct phy *generic_phy;
  92         struct phy_provider *phy_provider;
  93         struct gpio_desc *ctrl_gpios[PHY_MDM6600_NR_CTRL_LINES];
  94         struct gpio_descs *mode_gpios;
  95         struct gpio_descs *status_gpios;
  96         struct gpio_descs *cmd_gpios;
  97         struct delayed_work bootup_work;
  98         struct delayed_work status_work;
  99         struct delayed_work modem_wake_work;
 100         struct completion ack;
 101         bool enabled;                           /* mdm6600 phy enabled */
 102         bool running;                           /* mdm6600 boot done */
 103         bool awake;                             /* mdm6600 respnds on n_gsm */
 104         int status;
 105 };
 106
 107 static int phy_mdm6600_init(struct phy *x)
 108 {
 109         struct phy_mdm6600 *ddata = phy_get_drvdata(x);
 110         struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
 111
 112         if (!ddata->enabled)
 113                 return -EPROBE_DEFER;
 114
 115         gpiod_set_value_cansleep(enable_gpio, 0);
 116
 117         return 0;
 118 }
 119
 120 static int phy_mdm6600_power_on(struct phy *x)
 121 {
 122         struct phy_mdm6600 *ddata = phy_get_drvdata(x);
 123         struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
 124         int error;
 125
 126         if (!ddata->enabled)
 127                 return -ENODEV;
 128
 129         error = pinctrl_pm_select_default_state(ddata->dev);
 130         if (error)
 131                 dev_warn(ddata->dev, "%s: error with default_state: %i\n",
 132                          __func__, error);
 133
 134         gpiod_set_value_cansleep(enable_gpio, 1);
 135
 136         /* Allow aggressive PM for USB, it's only needed for n_gsm port */
 137         if (pm_runtime_enabled(&x->dev))
 138                 phy_pm_runtime_put(x);
 139
 140         return 0;
 141 }
 142
 143 static int phy_mdm6600_power_off(struct phy *x)
 144 {
 145         struct phy_mdm6600 *ddata = phy_get_drvdata(x);
 146         struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
 147         int error;
 148
 149         if (!ddata->enabled)
 150                 return -ENODEV;
 151
 152         /* Paired with phy_pm_runtime_put() in phy_mdm6600_power_on() */
 153         if (pm_runtime_enabled(&x->dev)) {
 154                 error = phy_pm_runtime_get(x);
 155                 if (error < 0 && error != -EINPROGRESS)
 156                         dev_warn(ddata->dev, "%s: phy_pm_runtime_get: %i\n",
 157                                  __func__, error);
 158         }
 159
 160         gpiod_set_value_cansleep(enable_gpio, 0);
 161
 162         error = pinctrl_pm_select_sleep_state(ddata->dev);
 163         if (error)
 164                 dev_warn(ddata->dev, "%s: error with sleep_state: %i\n",
 165                          __func__, error);
 166
 167         return 0;
 168 }
 169
 170 static const struct phy_ops gpio_usb_ops = {
 171         .init = phy_mdm6600_init,
 172         .power_on = phy_mdm6600_power_on,
 173         .power_off = phy_mdm6600_power_off,
 174         .owner = THIS_MODULE,
 175 };
 176
 177 /**
 178  * phy_mdm6600_cmd() - send a command request to mdm6600
 179  * @ddata: device driver data
 180  *
 181  * Configures the three command request GPIOs to the specified value.
 182  */
 183 static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
 184 {
 185         DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);
 186
 187         values[0] = val;
 188
 189         gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
 190                                        ddata->cmd_gpios->desc,
 191                                        ddata->cmd_gpios->info, values);
 192 }
 193
 194 /**
 195  * phy_mdm6600_status() - read mdm6600 status lines
 196  * @ddata: device driver data
 197  */
 198 static void phy_mdm6600_status(struct work_struct *work)
 199 {
 200         struct phy_mdm6600 *ddata;
 201         struct device *dev;
 202         DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
 203         int error, i, val = 0;
 204
 205         ddata = container_of(work, struct phy_mdm6600, status_work.work);
 206         dev = ddata->dev;
 207
 208         error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
 209                                                ddata->status_gpios->desc,
 210                                                ddata->status_gpios->info,
 211                                                values);
 212         if (error)
 213                 return;
 214
 215         for (i = 0; i < PHY_MDM6600_NR_STATUS_LINES; i++) {
 216                 val |= test_bit(i, values) << i;
 217                 dev_dbg(ddata->dev, "XXX %s: i: %i values[i]: %i val: %i\n",
 218                         __func__, i, test_bit(i, values), val);
 219         }
 220         ddata->status = values[0];
 221
 222         dev_info(dev, "modem status: %i %s\n",
 223                  ddata->status,
 224                  phy_mdm6600_status_name[ddata->status & 7]);
 225         complete(&ddata->ack);
 226 }
 227
 228 static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data)
 229 {
 230         struct phy_mdm6600 *ddata = data;
 231
 232         schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10));
 233
 234         return IRQ_HANDLED;
 235 }
 236
 237 /**
 238  * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting
 239  * @irq: interrupt
 240  * @data: interrupt handler data
 241  *
 242  * GPIO mode1 is used initially as output to configure the USB boot
 243  * mode for mdm6600. After booting it is used as input for OOB wake
 244  * signal from mdm6600 to the SoC. Just use it for debug info only
 245  * for now.
 246  */
 247 static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
 248 {
 249         struct phy_mdm6600 *ddata = data;
 250         struct gpio_desc *mode_gpio1;
 251
 252         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 253         dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n",
 254                 gpiod_get_value(mode_gpio1));
 255
 256         return IRQ_HANDLED;
 257 }
 258
 259 /**
 260  * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines
 261  * @ddata: device driver data
 262  */
 263 static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata)
 264 {
 265         struct device *dev = ddata->dev;
 266         int i, error, irq;
 267
 268         for (i = PHY_MDM6600_STATUS0;
 269              i <= PHY_MDM6600_STATUS2; i++) {
 270                 struct gpio_desc *gpio = ddata->status_gpios->desc[i];
 271
 272                 irq = gpiod_to_irq(gpio);
 273                 if (irq <= 0)
 274                         continue;
 275
 276                 error = devm_request_threaded_irq(dev, irq, NULL,
 277                                         phy_mdm6600_irq_thread,
 278                                         IRQF_TRIGGER_RISING |
 279                                         IRQF_TRIGGER_FALLING |
 280                                         IRQF_ONESHOT,
 281                                         "mdm6600",
 282                                         ddata);
 283                 if (error)
 284                         dev_warn(dev, "no modem status irq%i: %i\n",
 285                                  irq, error);
 286         }
 287 }
 288
 289 struct phy_mdm6600_map {
 290         const char *name;
 291         int direction;
 292 };
 293
 294 static const struct phy_mdm6600_map
 295 phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = {
 296         { "enable", GPIOD_OUT_LOW, },           /* low = phy disabled */
 297         { "power", GPIOD_OUT_LOW, },            /* low = off */
 298         { "reset", GPIOD_OUT_HIGH, },           /* high = reset */
 299 };
 300
 301 /**
 302  * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines
 303  * @ddata: device driver data
 304  */
 305 static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata)
 306 {
 307         struct device *dev = ddata->dev;
 308         int i;
 309
 310         /* MDM6600 control lines */
 311         for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) {
 312                 const struct phy_mdm6600_map *map =
 313                         &phy_mdm6600_ctrl_gpio_map[i];
 314                 struct gpio_desc **gpio = &ddata->ctrl_gpios[i];
 315
 316                 *gpio = devm_gpiod_get(dev, map->name, map->direction);
 317                 if (IS_ERR(*gpio)) {
 318                         dev_info(dev, "gpio %s error %li\n",
 319                                  map->name, PTR_ERR(*gpio));
 320                         return PTR_ERR(*gpio);
 321                 }
 322         }
 323
 324         /* MDM6600 USB start-up mode output lines */
 325         ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode",
 326                                                  GPIOD_OUT_LOW);
 327         if (IS_ERR(ddata->mode_gpios))
 328                 return PTR_ERR(ddata->mode_gpios);
 329
 330         if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES)
 331                 return -EINVAL;
 332
 333         /* MDM6600 status input lines */
 334         ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status",
 335                                                    GPIOD_IN);
 336         if (IS_ERR(ddata->status_gpios))
 337                 return PTR_ERR(ddata->status_gpios);
 338
 339         if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES)
 340                 return -EINVAL;
 341
 342         /* MDM6600 cmd output lines */
 343         ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd",
 344                                                 GPIOD_OUT_LOW);
 345         if (IS_ERR(ddata->cmd_gpios))
 346                 return PTR_ERR(ddata->cmd_gpios);
 347
 348         if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES)
 349                 return -EINVAL;
 350
 351         return 0;
 352 }
 353
 354 /**
 355  * phy_mdm6600_device_power_on() - power on mdm6600 device
 356  * @ddata: device driver data
 357  *
 358  * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure
 359  * the shared USB bootmode GPIOs are configured, then request modem start-up,
 360  * reset and power-up.. And then we need to recycle the shared USB bootmode
 361  * GPIOs as they are also used for Out of Band (OOB) wake for the USB and
 362  * TS 27.010 serial mux.
 363  */
 364 static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata)
 365 {
 366         struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio;
 367         int error = 0, wakeirq;
 368
 369         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 370         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 371         reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 372         power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER];
 373
 374         /*
 375          * Shared GPIOs must be low for normal USB mode. After booting
 376          * they are used for OOB wake signaling. These can be also used
 377          * to configure USB flashing mode later on based on a module
 378          * parameter.
 379          */
 380         gpiod_set_value_cansleep(mode_gpio0, 0);
 381         gpiod_set_value_cansleep(mode_gpio1, 0);
 382
 383         /* Request start-up mode */
 384         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS);
 385
 386         /* Request a reset first */
 387         gpiod_set_value_cansleep(reset_gpio, 0);
 388         msleep(100);
 389
 390         /* Toggle power GPIO to request mdm6600 to start */
 391         gpiod_set_value_cansleep(power_gpio, 1);
 392         msleep(100);
 393         gpiod_set_value_cansleep(power_gpio, 0);
 394
 395         /*
 396          * Looks like the USB PHY needs between 2.2 to 4 seconds.
 397          * If we try to use it before that, we will get L3 errors
 398          * from omap-usb-host trying to access the PHY. See also
 399          * phy_mdm6600_init() for -EPROBE_DEFER.
 400          */
 401         msleep(PHY_MDM6600_PHY_DELAY_MS);
 402         ddata->enabled = true;
 403
 404         /* Booting up the rest of MDM6600 will take total about 8 seconds */
 405         dev_info(ddata->dev, "Waiting for power up request to complete..\n");
 406         if (wait_for_completion_timeout(&ddata->ack,
 407                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) {
 408                 if (ddata->status > PHY_MDM6600_STATUS_PANIC &&
 409                     ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK)
 410                         dev_info(ddata->dev, "Powered up OK\n");
 411         } else {
 412                 ddata->enabled = false;
 413                 error = -ETIMEDOUT;
 414                 dev_err(ddata->dev, "Timed out powering up\n");
 415         }
 416
 417         /* Reconfigure mode1 GPIO as input for OOB wake */
 418         gpiod_direction_input(mode_gpio1);
 419
 420         wakeirq = gpiod_to_irq(mode_gpio1);
 421         if (wakeirq <= 0)
 422                 return wakeirq;
 423
 424         error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL,
 425                                           phy_mdm6600_wakeirq_thread,
 426                                           IRQF_TRIGGER_RISING |
 427                                           IRQF_TRIGGER_FALLING |
 428                                           IRQF_ONESHOT,
 429                                           "mdm6600-wake",
 430                                           ddata);
 431         if (error)
 432                 dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n",
 433                          wakeirq, error);
 434
 435         ddata->running = true;
 436
 437         return error;
 438 }
 439
 440 /**
 441  * phy_mdm6600_device_power_off() - power off mdm6600 device
 442  * @ddata: device driver data
 443  */
 444 static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata)
 445 {
 446         struct gpio_desc *reset_gpio =
 447                 ddata->ctrl_gpios[PHY_MDM6600_RESET];
 448
 449         ddata->enabled = false;
 450         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ);
 451         msleep(100);
 452
 453         gpiod_set_value_cansleep(reset_gpio, 1);
 454
 455         dev_info(ddata->dev, "Waiting for power down request to complete.. ");
 456         if (wait_for_completion_timeout(&ddata->ack,
 457                                         msecs_to_jiffies(5000))) {
 458                 if (ddata->status == PHY_MDM6600_STATUS_PANIC)
 459                         dev_info(ddata->dev, "Powered down OK\n");
 460         } else {
 461                 dev_err(ddata->dev, "Timed out powering down\n");
 462         }
 463 }
 464
 465 static void phy_mdm6600_deferred_power_on(struct work_struct *work)
 466 {
 467         struct phy_mdm6600 *ddata;
 468         int error;
 469
 470         ddata = container_of(work, struct phy_mdm6600, bootup_work.work);
 471
 472         error = phy_mdm6600_device_power_on(ddata);
 473         if (error)
 474                 dev_err(ddata->dev, "Device not functional\n");
 475 }
 476
 477 /*
 478  * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps,
 479  * we need to keep the modem awake by kicking it's mode0 GPIO. This will
 480  * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using
 481  * the modem, runtime PM auto mode can be enabled so modem can enter low
 482  * power mode.
 483  */
 484 static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata)
 485 {
 486         struct gpio_desc *mode_gpio0;
 487
 488         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 489         gpiod_set_value_cansleep(mode_gpio0, 1);
 490         usleep_range(5, 15);
 491         gpiod_set_value_cansleep(mode_gpio0, 0);
 492         if (ddata->awake)
 493                 usleep_range(5, 15);
 494         else
 495                 msleep(MDM6600_MODEM_WAKE_DELAY_MS);
 496 }
 497
 498 static void phy_mdm6600_modem_wake(struct work_struct *work)
 499 {
 500         struct phy_mdm6600 *ddata;
 501
 502         ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work);
 503         phy_mdm6600_wake_modem(ddata);
 504         schedule_delayed_work(&ddata->modem_wake_work,
 505                               msecs_to_jiffies(MDM6600_MODEM_IDLE_DELAY_MS));
 506 }
 507
 508 static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev)
 509 {
 510         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 511
 512         cancel_delayed_work_sync(&ddata->modem_wake_work);
 513         ddata->awake = false;
 514
 515         return 0;
 516 }
 517
 518 static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev)
 519 {
 520         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 521
 522         phy_mdm6600_modem_wake(&ddata->modem_wake_work.work);
 523         ddata->awake = true;
 524
 525         return 0;
 526 }
 527
 528 static const struct dev_pm_ops phy_mdm6600_pm_ops = {
 529         SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend,
 530                            phy_mdm6600_runtime_resume, NULL)
 531 };
 532
 533 static const struct of_device_id phy_mdm6600_id_table[] = {
 534         { .compatible = "motorola,mapphone-mdm6600", },
 535         {},
 536 };
 537 MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table);
 538
 539 static int phy_mdm6600_probe(struct platform_device *pdev)
 540 {
 541         struct phy_mdm6600 *ddata;
 542         int error;
 543
 544         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 545         if (!ddata)
 546                 return -ENOMEM;
 547
 548         INIT_DELAYED_WORK(&ddata->bootup_work,
 549                           phy_mdm6600_deferred_power_on);
 550         INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status);
 551         INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake);
 552         init_completion(&ddata->ack);
 553
 554         ddata->dev = &pdev->dev;
 555         platform_set_drvdata(pdev, ddata);
 556
 557         /* Active state selected in phy_mdm6600_power_on() */
 558         error = pinctrl_pm_select_sleep_state(ddata->dev);
 559         if (error)
 560                 dev_warn(ddata->dev, "%s: error with sleep_state: %i\n",
 561                          __func__, error);
 562
 563         error = phy_mdm6600_init_lines(ddata);
 564         if (error)
 565                 return error;
 566
 567         phy_mdm6600_init_irq(ddata);
 568         schedule_delayed_work(&ddata->bootup_work, 0);
 569
 570         /*
 571          * See phy_mdm6600_device_power_on(). We should be able
 572          * to remove this eventually when ohci-platform can deal
 573          * with -EPROBE_DEFER.
 574          */
 575         msleep(PHY_MDM6600_PHY_DELAY_MS + 500);
 576
 577         /*
 578          * Enable PM runtime only after PHY has been powered up properly.
 579          * It is currently only needed after USB suspends mdm6600 and n_gsm
 580          * needs to access the device. We don't want to do this earlier as
 581          * gpio mode0 pin doubles as mdm6600 wake-up gpio.
 582          */
 583         pm_runtime_use_autosuspend(ddata->dev);
 584         pm_runtime_set_autosuspend_delay(ddata->dev,
 585                                          MDM6600_MODEM_IDLE_DELAY_MS);
 586         pm_runtime_enable(ddata->dev);
 587         error = pm_runtime_get_sync(ddata->dev);
 588         if (error < 0) {
 589                 dev_warn(ddata->dev, "failed to wake modem: %i\n", error);
 590                 pm_runtime_put_noidle(ddata->dev);
 591                 goto cleanup;
 592         }
 593
 594         ddata->generic_phy = devm_phy_create(ddata->dev, NULL, &gpio_usb_ops);
 595         if (IS_ERR(ddata->generic_phy)) {
 596                 error = PTR_ERR(ddata->generic_phy);
 597                 goto idle;
 598         }
 599
 600         phy_set_drvdata(ddata->generic_phy, ddata);
 601
 602         ddata->phy_provider =
 603                 devm_of_phy_provider_register(ddata->dev,
 604                                               of_phy_simple_xlate);
 605         if (IS_ERR(ddata->phy_provider))
 606                 error = PTR_ERR(ddata->phy_provider);
 607
 608 idle:
 609         pm_runtime_mark_last_busy(ddata->dev);
 610         pm_runtime_put_autosuspend(ddata->dev);
 611
 612 cleanup:
 613         if (error < 0)
 614                 phy_mdm6600_device_power_off(ddata);
 615
 616         return error;
 617 }
 618
 619 static int phy_mdm6600_remove(struct platform_device *pdev)
 620 {
 621         struct phy_mdm6600 *ddata = platform_get_drvdata(pdev);
 622         struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 623
 624         pm_runtime_dont_use_autosuspend(ddata->dev);
 625         pm_runtime_put_sync(ddata->dev);
 626         pm_runtime_disable(ddata->dev);
 627
 628         if (!ddata->running)
 629                 wait_for_completion_timeout(&ddata->ack,
 630                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS));
 631
 632         gpiod_set_value_cansleep(reset_gpio, 1);
 633         phy_mdm6600_device_power_off(ddata);
 634
 635         cancel_delayed_work_sync(&ddata->modem_wake_work);
 636         cancel_delayed_work_sync(&ddata->bootup_work);
 637         cancel_delayed_work_sync(&ddata->status_work);
 638
 639         return 0;
 640 }
 641
 642 static struct platform_driver phy_mdm6600_driver = {
 643         .probe = phy_mdm6600_probe,
 644         .remove = phy_mdm6600_remove,
 645         .driver = {
 646                 .name = "phy-mapphone-mdm6600",
 647                 .pm = &phy_mdm6600_pm_ops,
 648                 .of_match_table = of_match_ptr(phy_mdm6600_id_table),
 649         },
 650 };
 651
 652 module_platform_driver(phy_mdm6600_driver);
 653
 654 MODULE_ALIAS("platform:gpio_usb");
 655 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 656 MODULE_DESCRIPTION("mdm6600 gpio usb phy driver");
 657 MODULE_LICENSE("GPL v2");