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 PHY_MDM6600_WAKE_KICK_MS        600     /* time on after GPIO toggle */
  24 #define MDM6600_MODEM_IDLE_DELAY_MS     1000    /* modem after USB suspend */
  25 #define MDM6600_MODEM_WAKE_DELAY_MS     200     /* modem response after idle */
  26
  27 enum phy_mdm6600_ctrl_lines {
  28         PHY_MDM6600_ENABLE,                     /* USB PHY enable */
  29         PHY_MDM6600_POWER,                      /* Device power */
  30         PHY_MDM6600_RESET,                      /* Device reset */
  31         PHY_MDM6600_NR_CTRL_LINES,
  32 };
  33
  34 enum phy_mdm6600_bootmode_lines {
  35         PHY_MDM6600_MODE0,                      /* out USB mode0 and OOB wake */
  36         PHY_MDM6600_MODE1,                      /* out USB mode1, in OOB wake */
  37         PHY_MDM6600_NR_MODE_LINES,
  38 };
  39
  40 enum phy_mdm6600_cmd_lines {
  41         PHY_MDM6600_CMD0,
  42         PHY_MDM6600_CMD1,
  43         PHY_MDM6600_CMD2,
  44         PHY_MDM6600_NR_CMD_LINES,
  45 };
  46
  47 enum phy_mdm6600_status_lines {
  48         PHY_MDM6600_STATUS0,
  49         PHY_MDM6600_STATUS1,
  50         PHY_MDM6600_STATUS2,
  51         PHY_MDM6600_NR_STATUS_LINES,
  52 };
  53
  54 /*
  55  * MDM6600 command codes. These are based on Motorola Mapphone Linux
  56  * kernel tree.
  57  */
  58 enum phy_mdm6600_cmd {
  59         PHY_MDM6600_CMD_BP_PANIC_ACK,
  60         PHY_MDM6600_CMD_DATA_ONLY_BYPASS,       /* Reroute USB to CPCAP PHY */
  61         PHY_MDM6600_CMD_FULL_BYPASS,            /* Reroute USB to CPCAP PHY */
  62         PHY_MDM6600_CMD_NO_BYPASS,              /* Request normal USB mode */
  63         PHY_MDM6600_CMD_BP_SHUTDOWN_REQ,        /* Request device power off */
  64         PHY_MDM6600_CMD_BP_UNKNOWN_5,
  65         PHY_MDM6600_CMD_BP_UNKNOWN_6,
  66         PHY_MDM6600_CMD_UNDEFINED,
  67 };
  68
  69 /*
  70  * MDM6600 status codes. These are based on Motorola Mapphone Linux
  71  * kernel tree.
  72  */
  73 enum phy_mdm6600_status {
  74         PHY_MDM6600_STATUS_PANIC,               /* Seems to be really off */
  75         PHY_MDM6600_STATUS_PANIC_BUSY_WAIT,
  76         PHY_MDM6600_STATUS_QC_DLOAD,
  77         PHY_MDM6600_STATUS_RAM_DOWNLOADER,      /* MDM6600 USB flashing mode */
  78         PHY_MDM6600_STATUS_PHONE_CODE_AWAKE,    /* MDM6600 normal USB mode */
  79         PHY_MDM6600_STATUS_PHONE_CODE_ASLEEP,
  80         PHY_MDM6600_STATUS_SHUTDOWN_ACK,
  81         PHY_MDM6600_STATUS_UNDEFINED,
  82 };
  83
  84 static const char * const
  85 phy_mdm6600_status_name[] = {
  86         "off", "busy", "qc_dl", "ram_dl", "awake",
  87         "asleep", "shutdown", "undefined",
  88 };
  89
  90 struct phy_mdm6600 {
  91         struct device *dev;
  92         struct phy *generic_phy;
  93         struct phy_provider *phy_provider;
  94         struct gpio_desc *ctrl_gpios[PHY_MDM6600_NR_CTRL_LINES];
  95         struct gpio_descs *mode_gpios;
  96         struct gpio_descs *status_gpios;
  97         struct gpio_descs *cmd_gpios;
  98         struct delayed_work bootup_work;
  99         struct delayed_work status_work;
 100         struct delayed_work modem_wake_work;
 101         struct completion ack;
 102         bool enabled;                           /* mdm6600 phy enabled */
 103         bool running;                           /* mdm6600 boot done */
 104         bool awake;                             /* mdm6600 respnds on n_gsm */
 105         int status;
 106 };
 107
 108 static int phy_mdm6600_init(struct phy *x)
 109 {
 110         struct phy_mdm6600 *ddata = phy_get_drvdata(x);
 111         struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
 112
 113         if (!ddata->enabled)
 114                 return -EPROBE_DEFER;
 115
 116         gpiod_set_value_cansleep(enable_gpio, 0);
 117
 118         return 0;
 119 }
 120
 121 static int phy_mdm6600_power_on(struct phy *x)
 122 {
 123         struct phy_mdm6600 *ddata = phy_get_drvdata(x);
 124         struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
 125         int error;
 126
 127         if (!ddata->enabled)
 128                 return -ENODEV;
 129
 130         error = pinctrl_pm_select_default_state(ddata->dev);
 131         if (error)
 132                 dev_warn(ddata->dev, "%s: error with default_state: %i\n",
 133                          __func__, error);
 134
 135         gpiod_set_value_cansleep(enable_gpio, 1);
 136
 137         /* Allow aggressive PM for USB, it's only needed for n_gsm port */
 138         if (pm_runtime_enabled(&x->dev))
 139                 phy_pm_runtime_put(x);
 140
 141         return 0;
 142 }
 143
 144 static int phy_mdm6600_power_off(struct phy *x)
 145 {
 146         struct phy_mdm6600 *ddata = phy_get_drvdata(x);
 147         struct gpio_desc *enable_gpio = ddata->ctrl_gpios[PHY_MDM6600_ENABLE];
 148         int error;
 149
 150         if (!ddata->enabled)
 151                 return -ENODEV;
 152
 153         /* Paired with phy_pm_runtime_put() in phy_mdm6600_power_on() */
 154         if (pm_runtime_enabled(&x->dev)) {
 155                 error = phy_pm_runtime_get(x);
 156                 if (error < 0 && error != -EINPROGRESS)
 157                         dev_warn(ddata->dev, "%s: phy_pm_runtime_get: %i\n",
 158                                  __func__, error);
 159         }
 160
 161         gpiod_set_value_cansleep(enable_gpio, 0);
 162
 163         error = pinctrl_pm_select_sleep_state(ddata->dev);
 164         if (error)
 165                 dev_warn(ddata->dev, "%s: error with sleep_state: %i\n",
 166                          __func__, error);
 167
 168         return 0;
 169 }
 170
 171 static const struct phy_ops gpio_usb_ops = {
 172         .init = phy_mdm6600_init,
 173         .power_on = phy_mdm6600_power_on,
 174         .power_off = phy_mdm6600_power_off,
 175         .owner = THIS_MODULE,
 176 };
 177
 178 /**
 179  * phy_mdm6600_cmd() - send a command request to mdm6600
 180  * @ddata: device driver data
 181  * @val: value of cmd to be set
 182  *
 183  * Configures the three command request GPIOs to the specified value.
 184  */
 185 static void phy_mdm6600_cmd(struct phy_mdm6600 *ddata, int val)
 186 {
 187         DECLARE_BITMAP(values, PHY_MDM6600_NR_CMD_LINES);
 188
 189         values[0] = val;
 190
 191         gpiod_set_array_value_cansleep(PHY_MDM6600_NR_CMD_LINES,
 192                                        ddata->cmd_gpios->desc,
 193                                        ddata->cmd_gpios->info, values);
 194 }
 195
 196 /**
 197  * phy_mdm6600_status() - read mdm6600 status lines
 198  * @work: work structure
 199  */
 200 static void phy_mdm6600_status(struct work_struct *work)
 201 {
 202         struct phy_mdm6600 *ddata;
 203         struct device *dev;
 204         DECLARE_BITMAP(values, PHY_MDM6600_NR_STATUS_LINES);
 205         int error;
 206
 207         ddata = container_of(work, struct phy_mdm6600, status_work.work);
 208         dev = ddata->dev;
 209
 210         error = gpiod_get_array_value_cansleep(PHY_MDM6600_NR_STATUS_LINES,
 211                                                ddata->status_gpios->desc,
 212                                                ddata->status_gpios->info,
 213                                                values);
 214         if (error)
 215                 return;
 216
 217         ddata->status = values[0] & ((1 << PHY_MDM6600_NR_STATUS_LINES) - 1);
 218
 219         dev_info(dev, "modem status: %i %s\n",
 220                  ddata->status,
 221                  phy_mdm6600_status_name[ddata->status]);
 222         complete(&ddata->ack);
 223 }
 224
 225 static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data)
 226 {
 227         struct phy_mdm6600 *ddata = data;
 228
 229         schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10));
 230
 231         return IRQ_HANDLED;
 232 }
 233
 234 /**
 235  * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting
 236  * @irq: interrupt
 237  * @data: interrupt handler data
 238  *
 239  * GPIO mode1 is used initially as output to configure the USB boot
 240  * mode for mdm6600. After booting it is used as input for OOB wake
 241  * signal from mdm6600 to the SoC. Just use it for debug info only
 242  * for now.
 243  */
 244 static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
 245 {
 246         struct phy_mdm6600 *ddata = data;
 247         struct gpio_desc *mode_gpio1;
 248         int error, wakeup;
 249
 250         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 251         wakeup = gpiod_get_value(mode_gpio1);
 252         if (!wakeup)
 253                 return IRQ_NONE;
 254
 255         dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n", wakeup);
 256         error = pm_runtime_get_sync(ddata->dev);
 257         if (error < 0) {
 258                 pm_runtime_put_noidle(ddata->dev);
 259
 260                 return IRQ_NONE;
 261         }
 262
 263         /* Just wake-up and kick the autosuspend timer */
 264         pm_runtime_mark_last_busy(ddata->dev);
 265         pm_runtime_put_autosuspend(ddata->dev);
 266
 267         return IRQ_HANDLED;
 268 }
 269
 270 /**
 271  * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines
 272  * @ddata: device driver data
 273  */
 274 static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata)
 275 {
 276         struct device *dev = ddata->dev;
 277         int i, error, irq;
 278
 279         for (i = PHY_MDM6600_STATUS0;
 280              i <= PHY_MDM6600_STATUS2; i++) {
 281                 struct gpio_desc *gpio = ddata->status_gpios->desc[i];
 282
 283                 irq = gpiod_to_irq(gpio);
 284                 if (irq <= 0)
 285                         continue;
 286
 287                 error = devm_request_threaded_irq(dev, irq, NULL,
 288                                         phy_mdm6600_irq_thread,
 289                                         IRQF_TRIGGER_RISING |
 290                                         IRQF_TRIGGER_FALLING |
 291                                         IRQF_ONESHOT,
 292                                         "mdm6600",
 293                                         ddata);
 294                 if (error)
 295                         dev_warn(dev, "no modem status irq%i: %i\n",
 296                                  irq, error);
 297         }
 298 }
 299
 300 struct phy_mdm6600_map {
 301         const char *name;
 302         int direction;
 303 };
 304
 305 static const struct phy_mdm6600_map
 306 phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = {
 307         { "enable", GPIOD_OUT_LOW, },           /* low = phy disabled */
 308         { "power", GPIOD_OUT_LOW, },            /* low = off */
 309         { "reset", GPIOD_OUT_HIGH, },           /* high = reset */
 310 };
 311
 312 /**
 313  * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines
 314  * @ddata: device driver data
 315  */
 316 static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata)
 317 {
 318         struct device *dev = ddata->dev;
 319         int i;
 320
 321         /* MDM6600 control lines */
 322         for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) {
 323                 const struct phy_mdm6600_map *map =
 324                         &phy_mdm6600_ctrl_gpio_map[i];
 325                 struct gpio_desc **gpio = &ddata->ctrl_gpios[i];
 326
 327                 *gpio = devm_gpiod_get(dev, map->name, map->direction);
 328                 if (IS_ERR(*gpio)) {
 329                         dev_info(dev, "gpio %s error %li\n",
 330                                  map->name, PTR_ERR(*gpio));
 331                         return PTR_ERR(*gpio);
 332                 }
 333         }
 334
 335         /* MDM6600 USB start-up mode output lines */
 336         ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode",
 337                                                  GPIOD_OUT_LOW);
 338         if (IS_ERR(ddata->mode_gpios))
 339                 return PTR_ERR(ddata->mode_gpios);
 340
 341         if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES)
 342                 return -EINVAL;
 343
 344         /* MDM6600 status input lines */
 345         ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status",
 346                                                    GPIOD_IN);
 347         if (IS_ERR(ddata->status_gpios))
 348                 return PTR_ERR(ddata->status_gpios);
 349
 350         if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES)
 351                 return -EINVAL;
 352
 353         /* MDM6600 cmd output lines */
 354         ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd",
 355                                                 GPIOD_OUT_LOW);
 356         if (IS_ERR(ddata->cmd_gpios))
 357                 return PTR_ERR(ddata->cmd_gpios);
 358
 359         if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES)
 360                 return -EINVAL;
 361
 362         return 0;
 363 }
 364
 365 /**
 366  * phy_mdm6600_device_power_on() - power on mdm6600 device
 367  * @ddata: device driver data
 368  *
 369  * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure
 370  * the shared USB bootmode GPIOs are configured, then request modem start-up,
 371  * reset and power-up.. And then we need to recycle the shared USB bootmode
 372  * GPIOs as they are also used for Out of Band (OOB) wake for the USB and
 373  * TS 27.010 serial mux.
 374  */
 375 static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata)
 376 {
 377         struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio;
 378         int error = 0, wakeirq;
 379
 380         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 381         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 382         reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 383         power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER];
 384
 385         /*
 386          * Shared GPIOs must be low for normal USB mode. After booting
 387          * they are used for OOB wake signaling. These can be also used
 388          * to configure USB flashing mode later on based on a module
 389          * parameter.
 390          */
 391         gpiod_set_value_cansleep(mode_gpio0, 0);
 392         gpiod_set_value_cansleep(mode_gpio1, 0);
 393
 394         /* Request start-up mode */
 395         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS);
 396
 397         /* Request a reset first */
 398         gpiod_set_value_cansleep(reset_gpio, 0);
 399         msleep(100);
 400
 401         /* Toggle power GPIO to request mdm6600 to start */
 402         gpiod_set_value_cansleep(power_gpio, 1);
 403         msleep(100);
 404         gpiod_set_value_cansleep(power_gpio, 0);
 405
 406         /*
 407          * Looks like the USB PHY needs between 2.2 to 4 seconds.
 408          * If we try to use it before that, we will get L3 errors
 409          * from omap-usb-host trying to access the PHY. See also
 410          * phy_mdm6600_init() for -EPROBE_DEFER.
 411          */
 412         msleep(PHY_MDM6600_PHY_DELAY_MS);
 413         ddata->enabled = true;
 414
 415         /* Booting up the rest of MDM6600 will take total about 8 seconds */
 416         dev_info(ddata->dev, "Waiting for power up request to complete..\n");
 417         if (wait_for_completion_timeout(&ddata->ack,
 418                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) {
 419                 if (ddata->status > PHY_MDM6600_STATUS_PANIC &&
 420                     ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK)
 421                         dev_info(ddata->dev, "Powered up OK\n");
 422         } else {
 423                 ddata->enabled = false;
 424                 error = -ETIMEDOUT;
 425                 dev_err(ddata->dev, "Timed out powering up\n");
 426         }
 427
 428         /* Reconfigure mode1 GPIO as input for OOB wake */
 429         gpiod_direction_input(mode_gpio1);
 430
 431         wakeirq = gpiod_to_irq(mode_gpio1);
 432         if (wakeirq <= 0)
 433                 return wakeirq;
 434
 435         error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL,
 436                                           phy_mdm6600_wakeirq_thread,
 437                                           IRQF_TRIGGER_RISING |
 438                                           IRQF_TRIGGER_FALLING |
 439                                           IRQF_ONESHOT,
 440                                           "mdm6600-wake",
 441                                           ddata);
 442         if (error)
 443                 dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n",
 444                          wakeirq, error);
 445
 446         ddata->running = true;
 447
 448         return error;
 449 }
 450
 451 /**
 452  * phy_mdm6600_device_power_off() - power off mdm6600 device
 453  * @ddata: device driver data
 454  */
 455 static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata)
 456 {
 457         struct gpio_desc *reset_gpio =
 458                 ddata->ctrl_gpios[PHY_MDM6600_RESET];
 459
 460         ddata->enabled = false;
 461         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ);
 462         msleep(100);
 463
 464         gpiod_set_value_cansleep(reset_gpio, 1);
 465
 466         dev_info(ddata->dev, "Waiting for power down request to complete.. ");
 467         if (wait_for_completion_timeout(&ddata->ack,
 468                                         msecs_to_jiffies(5000))) {
 469                 if (ddata->status == PHY_MDM6600_STATUS_PANIC)
 470                         dev_info(ddata->dev, "Powered down OK\n");
 471         } else {
 472                 dev_err(ddata->dev, "Timed out powering down\n");
 473         }
 474 }
 475
 476 static void phy_mdm6600_deferred_power_on(struct work_struct *work)
 477 {
 478         struct phy_mdm6600 *ddata;
 479         int error;
 480
 481         ddata = container_of(work, struct phy_mdm6600, bootup_work.work);
 482
 483         error = phy_mdm6600_device_power_on(ddata);
 484         if (error)
 485                 dev_err(ddata->dev, "Device not functional\n");
 486 }
 487
 488 /*
 489  * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps,
 490  * we need to keep the modem awake by kicking it's mode0 GPIO. This will
 491  * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using
 492  * the modem, runtime PM auto mode can be enabled so modem can enter low
 493  * power mode.
 494  */
 495 static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata)
 496 {
 497         struct gpio_desc *mode_gpio0;
 498
 499         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 500         gpiod_set_value_cansleep(mode_gpio0, 1);
 501         usleep_range(5, 15);
 502         gpiod_set_value_cansleep(mode_gpio0, 0);
 503         if (ddata->awake)
 504                 usleep_range(5, 15);
 505         else
 506                 msleep(MDM6600_MODEM_WAKE_DELAY_MS);
 507 }
 508
 509 static void phy_mdm6600_modem_wake(struct work_struct *work)
 510 {
 511         struct phy_mdm6600 *ddata;
 512
 513         ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work);
 514         phy_mdm6600_wake_modem(ddata);
 515
 516         /*
 517          * The modem does not always stay awake 1.2 seconds after toggling
 518          * the wake GPIO, and sometimes it idles after about some 600 ms
 519          * making writes time out.
 520          */
 521         schedule_delayed_work(&ddata->modem_wake_work,
 522                               msecs_to_jiffies(PHY_MDM6600_WAKE_KICK_MS));
 523 }
 524
 525 static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev)
 526 {
 527         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 528
 529         cancel_delayed_work_sync(&ddata->modem_wake_work);
 530         ddata->awake = false;
 531
 532         return 0;
 533 }
 534
 535 static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev)
 536 {
 537         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 538
 539         phy_mdm6600_modem_wake(&ddata->modem_wake_work.work);
 540         ddata->awake = true;
 541
 542         return 0;
 543 }
 544
 545 static const struct dev_pm_ops phy_mdm6600_pm_ops = {
 546         SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend,
 547                            phy_mdm6600_runtime_resume, NULL)
 548 };
 549
 550 static const struct of_device_id phy_mdm6600_id_table[] = {
 551         { .compatible = "motorola,mapphone-mdm6600", },
 552         {},
 553 };
 554 MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table);
 555
 556 static int phy_mdm6600_probe(struct platform_device *pdev)
 557 {
 558         struct phy_mdm6600 *ddata;
 559         int error;
 560
 561         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 562         if (!ddata)
 563                 return -ENOMEM;
 564
 565         INIT_DELAYED_WORK(&ddata->bootup_work,
 566                           phy_mdm6600_deferred_power_on);
 567         INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status);
 568         INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake);
 569         init_completion(&ddata->ack);
 570
 571         ddata->dev = &pdev->dev;
 572         platform_set_drvdata(pdev, ddata);
 573
 574         /* Active state selected in phy_mdm6600_power_on() */
 575         error = pinctrl_pm_select_sleep_state(ddata->dev);
 576         if (error)
 577                 dev_warn(ddata->dev, "%s: error with sleep_state: %i\n",
 578                          __func__, error);
 579
 580         error = phy_mdm6600_init_lines(ddata);
 581         if (error)
 582                 return error;
 583
 584         phy_mdm6600_init_irq(ddata);
 585         schedule_delayed_work(&ddata->bootup_work, 0);
 586
 587         /*
 588          * See phy_mdm6600_device_power_on(). We should be able
 589          * to remove this eventually when ohci-platform can deal
 590          * with -EPROBE_DEFER.
 591          */
 592         msleep(PHY_MDM6600_PHY_DELAY_MS + 500);
 593
 594         /*
 595          * Enable PM runtime only after PHY has been powered up properly.
 596          * It is currently only needed after USB suspends mdm6600 and n_gsm
 597          * needs to access the device. We don't want to do this earlier as
 598          * gpio mode0 pin doubles as mdm6600 wake-up gpio.
 599          */
 600         pm_runtime_use_autosuspend(ddata->dev);
 601         pm_runtime_set_autosuspend_delay(ddata->dev,
 602                                          MDM6600_MODEM_IDLE_DELAY_MS);
 603         pm_runtime_enable(ddata->dev);
 604         error = pm_runtime_get_sync(ddata->dev);
 605         if (error < 0) {
 606                 dev_warn(ddata->dev, "failed to wake modem: %i\n", error);
 607                 pm_runtime_put_noidle(ddata->dev);
 608                 goto cleanup;
 609         }
 610
 611         ddata->generic_phy = devm_phy_create(ddata->dev, NULL, &gpio_usb_ops);
 612         if (IS_ERR(ddata->generic_phy)) {
 613                 error = PTR_ERR(ddata->generic_phy);
 614                 goto idle;
 615         }
 616
 617         phy_set_drvdata(ddata->generic_phy, ddata);
 618
 619         ddata->phy_provider =
 620                 devm_of_phy_provider_register(ddata->dev,
 621                                               of_phy_simple_xlate);
 622         if (IS_ERR(ddata->phy_provider))
 623                 error = PTR_ERR(ddata->phy_provider);
 624
 625 idle:
 626         pm_runtime_mark_last_busy(ddata->dev);
 627         pm_runtime_put_autosuspend(ddata->dev);
 628
 629 cleanup:
 630         if (error < 0)
 631                 phy_mdm6600_device_power_off(ddata);
 632
 633         return error;
 634 }
 635
 636 static int phy_mdm6600_remove(struct platform_device *pdev)
 637 {
 638         struct phy_mdm6600 *ddata = platform_get_drvdata(pdev);
 639         struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 640
 641         pm_runtime_dont_use_autosuspend(ddata->dev);
 642         pm_runtime_put_sync(ddata->dev);
 643         pm_runtime_disable(ddata->dev);
 644
 645         if (!ddata->running)
 646                 wait_for_completion_timeout(&ddata->ack,
 647                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS));
 648
 649         gpiod_set_value_cansleep(reset_gpio, 1);
 650         phy_mdm6600_device_power_off(ddata);
 651
 652         cancel_delayed_work_sync(&ddata->modem_wake_work);
 653         cancel_delayed_work_sync(&ddata->bootup_work);
 654         cancel_delayed_work_sync(&ddata->status_work);
 655
 656         return 0;
 657 }
 658
 659 static struct platform_driver phy_mdm6600_driver = {
 660         .probe = phy_mdm6600_probe,
 661         .remove = phy_mdm6600_remove,
 662         .driver = {
 663                 .name = "phy-mapphone-mdm6600",
 664                 .pm = &phy_mdm6600_pm_ops,
 665                 .of_match_table = of_match_ptr(phy_mdm6600_id_table),
 666         },
 667 };
 668
 669 module_platform_driver(phy_mdm6600_driver);
 670
 671 MODULE_ALIAS("platform:gpio_usb");
 672 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 673 MODULE_DESCRIPTION("mdm6600 gpio usb phy driver");
 674 MODULE_LICENSE("GPL v2");