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;
 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         ddata->status = values[0] & ((1 << PHY_MDM6600_NR_STATUS_LINES) - 1);
 216
 217         dev_info(dev, "modem status: %i %s\n",
 218                  ddata->status,
 219                  phy_mdm6600_status_name[ddata->status]);
 220         complete(&ddata->ack);
 221 }
 222
 223 static irqreturn_t phy_mdm6600_irq_thread(int irq, void *data)
 224 {
 225         struct phy_mdm6600 *ddata = data;
 226
 227         schedule_delayed_work(&ddata->status_work, msecs_to_jiffies(10));
 228
 229         return IRQ_HANDLED;
 230 }
 231
 232 /**
 233  * phy_mdm6600_wakeirq_thread - handle mode1 line OOB wake after booting
 234  * @irq: interrupt
 235  * @data: interrupt handler data
 236  *
 237  * GPIO mode1 is used initially as output to configure the USB boot
 238  * mode for mdm6600. After booting it is used as input for OOB wake
 239  * signal from mdm6600 to the SoC. Just use it for debug info only
 240  * for now.
 241  */
 242 static irqreturn_t phy_mdm6600_wakeirq_thread(int irq, void *data)
 243 {
 244         struct phy_mdm6600 *ddata = data;
 245         struct gpio_desc *mode_gpio1;
 246
 247         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 248         dev_dbg(ddata->dev, "OOB wake on mode_gpio1: %i\n",
 249                 gpiod_get_value(mode_gpio1));
 250
 251         return IRQ_HANDLED;
 252 }
 253
 254 /**
 255  * phy_mdm6600_init_irq() - initialize mdm6600 status IRQ lines
 256  * @ddata: device driver data
 257  */
 258 static void phy_mdm6600_init_irq(struct phy_mdm6600 *ddata)
 259 {
 260         struct device *dev = ddata->dev;
 261         int i, error, irq;
 262
 263         for (i = PHY_MDM6600_STATUS0;
 264              i <= PHY_MDM6600_STATUS2; i++) {
 265                 struct gpio_desc *gpio = ddata->status_gpios->desc[i];
 266
 267                 irq = gpiod_to_irq(gpio);
 268                 if (irq <= 0)
 269                         continue;
 270
 271                 error = devm_request_threaded_irq(dev, irq, NULL,
 272                                         phy_mdm6600_irq_thread,
 273                                         IRQF_TRIGGER_RISING |
 274                                         IRQF_TRIGGER_FALLING |
 275                                         IRQF_ONESHOT,
 276                                         "mdm6600",
 277                                         ddata);
 278                 if (error)
 279                         dev_warn(dev, "no modem status irq%i: %i\n",
 280                                  irq, error);
 281         }
 282 }
 283
 284 struct phy_mdm6600_map {
 285         const char *name;
 286         int direction;
 287 };
 288
 289 static const struct phy_mdm6600_map
 290 phy_mdm6600_ctrl_gpio_map[PHY_MDM6600_NR_CTRL_LINES] = {
 291         { "enable", GPIOD_OUT_LOW, },           /* low = phy disabled */
 292         { "power", GPIOD_OUT_LOW, },            /* low = off */
 293         { "reset", GPIOD_OUT_HIGH, },           /* high = reset */
 294 };
 295
 296 /**
 297  * phy_mdm6600_init_lines() - initialize mdm6600 GPIO lines
 298  * @ddata: device driver data
 299  */
 300 static int phy_mdm6600_init_lines(struct phy_mdm6600 *ddata)
 301 {
 302         struct device *dev = ddata->dev;
 303         int i;
 304
 305         /* MDM6600 control lines */
 306         for (i = 0; i < ARRAY_SIZE(phy_mdm6600_ctrl_gpio_map); i++) {
 307                 const struct phy_mdm6600_map *map =
 308                         &phy_mdm6600_ctrl_gpio_map[i];
 309                 struct gpio_desc **gpio = &ddata->ctrl_gpios[i];
 310
 311                 *gpio = devm_gpiod_get(dev, map->name, map->direction);
 312                 if (IS_ERR(*gpio)) {
 313                         dev_info(dev, "gpio %s error %li\n",
 314                                  map->name, PTR_ERR(*gpio));
 315                         return PTR_ERR(*gpio);
 316                 }
 317         }
 318
 319         /* MDM6600 USB start-up mode output lines */
 320         ddata->mode_gpios = devm_gpiod_get_array(dev, "motorola,mode",
 321                                                  GPIOD_OUT_LOW);
 322         if (IS_ERR(ddata->mode_gpios))
 323                 return PTR_ERR(ddata->mode_gpios);
 324
 325         if (ddata->mode_gpios->ndescs != PHY_MDM6600_NR_MODE_LINES)
 326                 return -EINVAL;
 327
 328         /* MDM6600 status input lines */
 329         ddata->status_gpios = devm_gpiod_get_array(dev, "motorola,status",
 330                                                    GPIOD_IN);
 331         if (IS_ERR(ddata->status_gpios))
 332                 return PTR_ERR(ddata->status_gpios);
 333
 334         if (ddata->status_gpios->ndescs != PHY_MDM6600_NR_STATUS_LINES)
 335                 return -EINVAL;
 336
 337         /* MDM6600 cmd output lines */
 338         ddata->cmd_gpios = devm_gpiod_get_array(dev, "motorola,cmd",
 339                                                 GPIOD_OUT_LOW);
 340         if (IS_ERR(ddata->cmd_gpios))
 341                 return PTR_ERR(ddata->cmd_gpios);
 342
 343         if (ddata->cmd_gpios->ndescs != PHY_MDM6600_NR_CMD_LINES)
 344                 return -EINVAL;
 345
 346         return 0;
 347 }
 348
 349 /**
 350  * phy_mdm6600_device_power_on() - power on mdm6600 device
 351  * @ddata: device driver data
 352  *
 353  * To get the integrated USB phy in MDM6600 takes some hoops. We must ensure
 354  * the shared USB bootmode GPIOs are configured, then request modem start-up,
 355  * reset and power-up.. And then we need to recycle the shared USB bootmode
 356  * GPIOs as they are also used for Out of Band (OOB) wake for the USB and
 357  * TS 27.010 serial mux.
 358  */
 359 static int phy_mdm6600_device_power_on(struct phy_mdm6600 *ddata)
 360 {
 361         struct gpio_desc *mode_gpio0, *mode_gpio1, *reset_gpio, *power_gpio;
 362         int error = 0, wakeirq;
 363
 364         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 365         mode_gpio1 = ddata->mode_gpios->desc[PHY_MDM6600_MODE1];
 366         reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 367         power_gpio = ddata->ctrl_gpios[PHY_MDM6600_POWER];
 368
 369         /*
 370          * Shared GPIOs must be low for normal USB mode. After booting
 371          * they are used for OOB wake signaling. These can be also used
 372          * to configure USB flashing mode later on based on a module
 373          * parameter.
 374          */
 375         gpiod_set_value_cansleep(mode_gpio0, 0);
 376         gpiod_set_value_cansleep(mode_gpio1, 0);
 377
 378         /* Request start-up mode */
 379         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_NO_BYPASS);
 380
 381         /* Request a reset first */
 382         gpiod_set_value_cansleep(reset_gpio, 0);
 383         msleep(100);
 384
 385         /* Toggle power GPIO to request mdm6600 to start */
 386         gpiod_set_value_cansleep(power_gpio, 1);
 387         msleep(100);
 388         gpiod_set_value_cansleep(power_gpio, 0);
 389
 390         /*
 391          * Looks like the USB PHY needs between 2.2 to 4 seconds.
 392          * If we try to use it before that, we will get L3 errors
 393          * from omap-usb-host trying to access the PHY. See also
 394          * phy_mdm6600_init() for -EPROBE_DEFER.
 395          */
 396         msleep(PHY_MDM6600_PHY_DELAY_MS);
 397         ddata->enabled = true;
 398
 399         /* Booting up the rest of MDM6600 will take total about 8 seconds */
 400         dev_info(ddata->dev, "Waiting for power up request to complete..\n");
 401         if (wait_for_completion_timeout(&ddata->ack,
 402                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS))) {
 403                 if (ddata->status > PHY_MDM6600_STATUS_PANIC &&
 404                     ddata->status < PHY_MDM6600_STATUS_SHUTDOWN_ACK)
 405                         dev_info(ddata->dev, "Powered up OK\n");
 406         } else {
 407                 ddata->enabled = false;
 408                 error = -ETIMEDOUT;
 409                 dev_err(ddata->dev, "Timed out powering up\n");
 410         }
 411
 412         /* Reconfigure mode1 GPIO as input for OOB wake */
 413         gpiod_direction_input(mode_gpio1);
 414
 415         wakeirq = gpiod_to_irq(mode_gpio1);
 416         if (wakeirq <= 0)
 417                 return wakeirq;
 418
 419         error = devm_request_threaded_irq(ddata->dev, wakeirq, NULL,
 420                                           phy_mdm6600_wakeirq_thread,
 421                                           IRQF_TRIGGER_RISING |
 422                                           IRQF_TRIGGER_FALLING |
 423                                           IRQF_ONESHOT,
 424                                           "mdm6600-wake",
 425                                           ddata);
 426         if (error)
 427                 dev_warn(ddata->dev, "no modem wakeirq irq%i: %i\n",
 428                          wakeirq, error);
 429
 430         ddata->running = true;
 431
 432         return error;
 433 }
 434
 435 /**
 436  * phy_mdm6600_device_power_off() - power off mdm6600 device
 437  * @ddata: device driver data
 438  */
 439 static void phy_mdm6600_device_power_off(struct phy_mdm6600 *ddata)
 440 {
 441         struct gpio_desc *reset_gpio =
 442                 ddata->ctrl_gpios[PHY_MDM6600_RESET];
 443
 444         ddata->enabled = false;
 445         phy_mdm6600_cmd(ddata, PHY_MDM6600_CMD_BP_SHUTDOWN_REQ);
 446         msleep(100);
 447
 448         gpiod_set_value_cansleep(reset_gpio, 1);
 449
 450         dev_info(ddata->dev, "Waiting for power down request to complete.. ");
 451         if (wait_for_completion_timeout(&ddata->ack,
 452                                         msecs_to_jiffies(5000))) {
 453                 if (ddata->status == PHY_MDM6600_STATUS_PANIC)
 454                         dev_info(ddata->dev, "Powered down OK\n");
 455         } else {
 456                 dev_err(ddata->dev, "Timed out powering down\n");
 457         }
 458 }
 459
 460 static void phy_mdm6600_deferred_power_on(struct work_struct *work)
 461 {
 462         struct phy_mdm6600 *ddata;
 463         int error;
 464
 465         ddata = container_of(work, struct phy_mdm6600, bootup_work.work);
 466
 467         error = phy_mdm6600_device_power_on(ddata);
 468         if (error)
 469                 dev_err(ddata->dev, "Device not functional\n");
 470 }
 471
 472 /*
 473  * USB suspend puts mdm6600 into low power mode. For any n_gsm using apps,
 474  * we need to keep the modem awake by kicking it's mode0 GPIO. This will
 475  * keep the modem awake for about 1.2 seconds. When no n_gsm apps are using
 476  * the modem, runtime PM auto mode can be enabled so modem can enter low
 477  * power mode.
 478  */
 479 static void phy_mdm6600_wake_modem(struct phy_mdm6600 *ddata)
 480 {
 481         struct gpio_desc *mode_gpio0;
 482
 483         mode_gpio0 = ddata->mode_gpios->desc[PHY_MDM6600_MODE0];
 484         gpiod_set_value_cansleep(mode_gpio0, 1);
 485         usleep_range(5, 15);
 486         gpiod_set_value_cansleep(mode_gpio0, 0);
 487         if (ddata->awake)
 488                 usleep_range(5, 15);
 489         else
 490                 msleep(MDM6600_MODEM_WAKE_DELAY_MS);
 491 }
 492
 493 static void phy_mdm6600_modem_wake(struct work_struct *work)
 494 {
 495         struct phy_mdm6600 *ddata;
 496
 497         ddata = container_of(work, struct phy_mdm6600, modem_wake_work.work);
 498         phy_mdm6600_wake_modem(ddata);
 499         schedule_delayed_work(&ddata->modem_wake_work,
 500                               msecs_to_jiffies(MDM6600_MODEM_IDLE_DELAY_MS));
 501 }
 502
 503 static int __maybe_unused phy_mdm6600_runtime_suspend(struct device *dev)
 504 {
 505         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 506
 507         cancel_delayed_work_sync(&ddata->modem_wake_work);
 508         ddata->awake = false;
 509
 510         return 0;
 511 }
 512
 513 static int __maybe_unused phy_mdm6600_runtime_resume(struct device *dev)
 514 {
 515         struct phy_mdm6600 *ddata = dev_get_drvdata(dev);
 516
 517         phy_mdm6600_modem_wake(&ddata->modem_wake_work.work);
 518         ddata->awake = true;
 519
 520         return 0;
 521 }
 522
 523 static const struct dev_pm_ops phy_mdm6600_pm_ops = {
 524         SET_RUNTIME_PM_OPS(phy_mdm6600_runtime_suspend,
 525                            phy_mdm6600_runtime_resume, NULL)
 526 };
 527
 528 static const struct of_device_id phy_mdm6600_id_table[] = {
 529         { .compatible = "motorola,mapphone-mdm6600", },
 530         {},
 531 };
 532 MODULE_DEVICE_TABLE(of, phy_mdm6600_id_table);
 533
 534 static int phy_mdm6600_probe(struct platform_device *pdev)
 535 {
 536         struct phy_mdm6600 *ddata;
 537         int error;
 538
 539         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 540         if (!ddata)
 541                 return -ENOMEM;
 542
 543         INIT_DELAYED_WORK(&ddata->bootup_work,
 544                           phy_mdm6600_deferred_power_on);
 545         INIT_DELAYED_WORK(&ddata->status_work, phy_mdm6600_status);
 546         INIT_DELAYED_WORK(&ddata->modem_wake_work, phy_mdm6600_modem_wake);
 547         init_completion(&ddata->ack);
 548
 549         ddata->dev = &pdev->dev;
 550         platform_set_drvdata(pdev, ddata);
 551
 552         /* Active state selected in phy_mdm6600_power_on() */
 553         error = pinctrl_pm_select_sleep_state(ddata->dev);
 554         if (error)
 555                 dev_warn(ddata->dev, "%s: error with sleep_state: %i\n",
 556                          __func__, error);
 557
 558         error = phy_mdm6600_init_lines(ddata);
 559         if (error)
 560                 return error;
 561
 562         phy_mdm6600_init_irq(ddata);
 563         schedule_delayed_work(&ddata->bootup_work, 0);
 564
 565         /*
 566          * See phy_mdm6600_device_power_on(). We should be able
 567          * to remove this eventually when ohci-platform can deal
 568          * with -EPROBE_DEFER.
 569          */
 570         msleep(PHY_MDM6600_PHY_DELAY_MS + 500);
 571
 572         /*
 573          * Enable PM runtime only after PHY has been powered up properly.
 574          * It is currently only needed after USB suspends mdm6600 and n_gsm
 575          * needs to access the device. We don't want to do this earlier as
 576          * gpio mode0 pin doubles as mdm6600 wake-up gpio.
 577          */
 578         pm_runtime_use_autosuspend(ddata->dev);
 579         pm_runtime_set_autosuspend_delay(ddata->dev,
 580                                          MDM6600_MODEM_IDLE_DELAY_MS);
 581         pm_runtime_enable(ddata->dev);
 582         error = pm_runtime_get_sync(ddata->dev);
 583         if (error < 0) {
 584                 dev_warn(ddata->dev, "failed to wake modem: %i\n", error);
 585                 pm_runtime_put_noidle(ddata->dev);
 586                 goto cleanup;
 587         }
 588
 589         ddata->generic_phy = devm_phy_create(ddata->dev, NULL, &gpio_usb_ops);
 590         if (IS_ERR(ddata->generic_phy)) {
 591                 error = PTR_ERR(ddata->generic_phy);
 592                 goto idle;
 593         }
 594
 595         phy_set_drvdata(ddata->generic_phy, ddata);
 596
 597         ddata->phy_provider =
 598                 devm_of_phy_provider_register(ddata->dev,
 599                                               of_phy_simple_xlate);
 600         if (IS_ERR(ddata->phy_provider))
 601                 error = PTR_ERR(ddata->phy_provider);
 602
 603 idle:
 604         pm_runtime_mark_last_busy(ddata->dev);
 605         pm_runtime_put_autosuspend(ddata->dev);
 606
 607 cleanup:
 608         if (error < 0)
 609                 phy_mdm6600_device_power_off(ddata);
 610
 611         return error;
 612 }
 613
 614 static int phy_mdm6600_remove(struct platform_device *pdev)
 615 {
 616         struct phy_mdm6600 *ddata = platform_get_drvdata(pdev);
 617         struct gpio_desc *reset_gpio = ddata->ctrl_gpios[PHY_MDM6600_RESET];
 618
 619         pm_runtime_dont_use_autosuspend(ddata->dev);
 620         pm_runtime_put_sync(ddata->dev);
 621         pm_runtime_disable(ddata->dev);
 622
 623         if (!ddata->running)
 624                 wait_for_completion_timeout(&ddata->ack,
 625                         msecs_to_jiffies(PHY_MDM6600_ENABLED_DELAY_MS));
 626
 627         gpiod_set_value_cansleep(reset_gpio, 1);
 628         phy_mdm6600_device_power_off(ddata);
 629
 630         cancel_delayed_work_sync(&ddata->modem_wake_work);
 631         cancel_delayed_work_sync(&ddata->bootup_work);
 632         cancel_delayed_work_sync(&ddata->status_work);
 633
 634         return 0;
 635 }
 636
 637 static struct platform_driver phy_mdm6600_driver = {
 638         .probe = phy_mdm6600_probe,
 639         .remove = phy_mdm6600_remove,
 640         .driver = {
 641                 .name = "phy-mapphone-mdm6600",
 642                 .pm = &phy_mdm6600_pm_ops,
 643                 .of_match_table = of_match_ptr(phy_mdm6600_id_table),
 644         },
 645 };
 646
 647 module_platform_driver(phy_mdm6600_driver);
 648
 649 MODULE_ALIAS("platform:gpio_usb");
 650 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 651 MODULE_DESCRIPTION("mdm6600 gpio usb phy driver");
 652 MODULE_LICENSE("GPL v2");