drivers/staging/greybus/arche-platform.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Arche Platform driver to enable Unipro link.
   4  *
   5  * Copyright 2014-2015 Google Inc.
   6  * Copyright 2014-2015 Linaro Ltd.
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/delay.h>
  11 #include <linux/gpio.h>
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/of_gpio.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/pinctrl/consumer.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/irq.h>
  21 #include <linux/suspend.h>
  22 #include <linux/time.h>
  23 #include "arche_platform.h"
  24 #include "greybus.h"
  25
  26 #if IS_ENABLED(CONFIG_USB_HSIC_USB3613)
  27 #include <linux/usb/usb3613.h>
  28 #else
  29 static inline int usb3613_hub_mode_ctrl(bool unused)
  30 {
  31         return 0;
  32 }
  33 #endif
  34
  35 #define WD_COLDBOOT_PULSE_WIDTH_MS      30
  36
  37 enum svc_wakedetect_state {
  38         WD_STATE_IDLE,                  /* Default state = pulled high/low */
  39         WD_STATE_BOOT_INIT,             /* WD = falling edge (low) */
  40         WD_STATE_COLDBOOT_TRIG,         /* WD = rising edge (high), > 30msec */
  41         WD_STATE_STANDBYBOOT_TRIG,      /* As of now not used ?? */
  42         WD_STATE_COLDBOOT_START,        /* Cold boot process started */
  43         WD_STATE_STANDBYBOOT_START,     /* Not used */
  44 };
  45
  46 struct arche_platform_drvdata {
  47         /* Control GPIO signals to and from AP <=> SVC */
  48         int svc_reset_gpio;
  49         bool is_reset_act_hi;
  50         int svc_sysboot_gpio;
  51         int wake_detect_gpio; /* bi-dir,maps to WAKE_MOD & WAKE_FRAME signals */
  52
  53         enum arche_platform_state state;
  54
  55         int svc_refclk_req;
  56         struct clk *svc_ref_clk;
  57
  58         struct pinctrl *pinctrl;
  59         struct pinctrl_state *pin_default;
  60
  61         int num_apbs;
  62
  63         enum svc_wakedetect_state wake_detect_state;
  64         int wake_detect_irq;
  65         spinlock_t wake_lock;                   /* Protect wake_detect_state */
  66         struct mutex platform_state_mutex;      /* Protect state */
  67         unsigned long wake_detect_start;
  68         struct notifier_block pm_notifier;
  69
  70         struct device *dev;
  71 };
  72
  73 /* Requires calling context to hold arche_pdata->platform_state_mutex */
  74 static void arche_platform_set_state(struct arche_platform_drvdata *arche_pdata,
  75                                      enum arche_platform_state state)
  76 {
  77         arche_pdata->state = state;
  78 }
  79
  80 /* Requires arche_pdata->wake_lock is held by calling context */
  81 static void arche_platform_set_wake_detect_state(
  82                                 struct arche_platform_drvdata *arche_pdata,
  83                                 enum svc_wakedetect_state state)
  84 {
  85         arche_pdata->wake_detect_state = state;
  86 }
  87
  88 static inline void svc_reset_onoff(unsigned int gpio, bool onoff)
  89 {
  90         gpio_set_value(gpio, onoff);
  91 }
  92
  93 static int apb_cold_boot(struct device *dev, void *data)
  94 {
  95         int ret;
  96
  97         ret = apb_ctrl_coldboot(dev);
  98         if (ret)
  99                 dev_warn(dev, "failed to coldboot\n");
 100
 101         /*Child nodes are independent, so do not exit coldboot operation */
 102         return 0;
 103 }
 104
 105 static int apb_poweroff(struct device *dev, void *data)
 106 {
 107         apb_ctrl_poweroff(dev);
 108
 109         /* Enable HUB3613 into HUB mode. */
 110         if (usb3613_hub_mode_ctrl(false))
 111                 dev_warn(dev, "failed to control hub device\n");
 112
 113         return 0;
 114 }
 115
 116 static void arche_platform_wd_irq_en(struct arche_platform_drvdata *arche_pdata)
 117 {
 118         /* Enable interrupt here, to read event back from SVC */
 119         gpio_direction_input(arche_pdata->wake_detect_gpio);
 120         enable_irq(arche_pdata->wake_detect_irq);
 121 }
 122
 123 static irqreturn_t arche_platform_wd_irq_thread(int irq, void *devid)
 124 {
 125         struct arche_platform_drvdata *arche_pdata = devid;
 126         unsigned long flags;
 127
 128         spin_lock_irqsave(&arche_pdata->wake_lock, flags);
 129         if (arche_pdata->wake_detect_state != WD_STATE_COLDBOOT_TRIG) {
 130                 /* Something is wrong */
 131                 spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
 132                 return IRQ_HANDLED;
 133         }
 134
 135         arche_platform_set_wake_detect_state(arche_pdata,
 136                                              WD_STATE_COLDBOOT_START);
 137         spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
 138
 139         /* It should complete power cycle, so first make sure it is poweroff */
 140         device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
 141
 142         /* Bring APB out of reset: cold boot sequence */
 143         device_for_each_child(arche_pdata->dev, NULL, apb_cold_boot);
 144
 145         /* Enable HUB3613 into HUB mode. */
 146         if (usb3613_hub_mode_ctrl(true))
 147                 dev_warn(arche_pdata->dev, "failed to control hub device\n");
 148
 149         spin_lock_irqsave(&arche_pdata->wake_lock, flags);
 150         arche_platform_set_wake_detect_state(arche_pdata, WD_STATE_IDLE);
 151         spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
 152
 153         return IRQ_HANDLED;
 154 }
 155
 156 static irqreturn_t arche_platform_wd_irq(int irq, void *devid)
 157 {
 158         struct arche_platform_drvdata *arche_pdata = devid;
 159         unsigned long flags;
 160
 161         spin_lock_irqsave(&arche_pdata->wake_lock, flags);
 162
 163         if (gpio_get_value(arche_pdata->wake_detect_gpio)) {
 164                 /* wake/detect rising */
 165
 166                 /*
 167                  * If wake/detect line goes high after low, within less than
 168                  * 30msec, then standby boot sequence is initiated, which is not
 169                  * supported/implemented as of now. So ignore it.
 170                  */
 171                 if (arche_pdata->wake_detect_state == WD_STATE_BOOT_INIT) {
 172                         if (time_before(jiffies,
 173                                         arche_pdata->wake_detect_start +
 174                                         msecs_to_jiffies(WD_COLDBOOT_PULSE_WIDTH_MS))) {
 175                                 arche_platform_set_wake_detect_state(arche_pdata,
 176                                                                      WD_STATE_IDLE);
 177                         } else {
 178                                 /*
 179                                  * Check we are not in middle of irq thread
 180                                  * already
 181                                  */
 182                                 if (arche_pdata->wake_detect_state !=
 183                                                 WD_STATE_COLDBOOT_START) {
 184                                         arche_platform_set_wake_detect_state(arche_pdata,
 185                                                                              WD_STATE_COLDBOOT_TRIG);
 186                                         spin_unlock_irqrestore(
 187                                                 &arche_pdata->wake_lock,
 188                                                 flags);
 189                                         return IRQ_WAKE_THREAD;
 190                                 }
 191                         }
 192                 }
 193         } else {
 194                 /* wake/detect falling */
 195                 if (arche_pdata->wake_detect_state == WD_STATE_IDLE) {
 196                         arche_pdata->wake_detect_start = jiffies;
 197                         /*
 198                          * In the beginning, when wake/detect goes low
 199                          * (first time), we assume it is meant for coldboot
 200                          * and set the flag. If wake/detect line stays low
 201                          * beyond 30msec, then it is coldboot else fallback
 202                          * to standby boot.
 203                          */
 204                         arche_platform_set_wake_detect_state(arche_pdata,
 205                                                              WD_STATE_BOOT_INIT);
 206                 }
 207         }
 208
 209         spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
 210
 211         return IRQ_HANDLED;
 212 }
 213
 214 /*
 215  * Requires arche_pdata->platform_state_mutex to be held
 216  */
 217 static int
 218 arche_platform_coldboot_seq(struct arche_platform_drvdata *arche_pdata)
 219 {
 220         int ret;
 221
 222         if (arche_pdata->state == ARCHE_PLATFORM_STATE_ACTIVE)
 223                 return 0;
 224
 225         dev_info(arche_pdata->dev, "Booting from cold boot state\n");
 226
 227         svc_reset_onoff(arche_pdata->svc_reset_gpio,
 228                         arche_pdata->is_reset_act_hi);
 229
 230         gpio_set_value(arche_pdata->svc_sysboot_gpio, 0);
 231         usleep_range(100, 200);
 232
 233         ret = clk_prepare_enable(arche_pdata->svc_ref_clk);
 234         if (ret) {
 235                 dev_err(arche_pdata->dev, "failed to enable svc_ref_clk: %d\n",
 236                         ret);
 237                 return ret;
 238         }
 239
 240         /* bring SVC out of reset */
 241         svc_reset_onoff(arche_pdata->svc_reset_gpio,
 242                         !arche_pdata->is_reset_act_hi);
 243
 244         arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_ACTIVE);
 245
 246         return 0;
 247 }
 248
 249 /*
 250  * Requires arche_pdata->platform_state_mutex to be held
 251  */
 252 static int
 253 arche_platform_fw_flashing_seq(struct arche_platform_drvdata *arche_pdata)
 254 {
 255         int ret;
 256
 257         if (arche_pdata->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
 258                 return 0;
 259
 260         dev_info(arche_pdata->dev, "Switching to FW flashing state\n");
 261
 262         svc_reset_onoff(arche_pdata->svc_reset_gpio,
 263                         arche_pdata->is_reset_act_hi);
 264
 265         gpio_set_value(arche_pdata->svc_sysboot_gpio, 1);
 266
 267         usleep_range(100, 200);
 268
 269         ret = clk_prepare_enable(arche_pdata->svc_ref_clk);
 270         if (ret) {
 271                 dev_err(arche_pdata->dev, "failed to enable svc_ref_clk: %d\n",
 272                         ret);
 273                 return ret;
 274         }
 275
 276         svc_reset_onoff(arche_pdata->svc_reset_gpio,
 277                         !arche_pdata->is_reset_act_hi);
 278
 279         arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_FW_FLASHING);
 280
 281         return 0;
 282 }
 283
 284 /*
 285  * Requires arche_pdata->platform_state_mutex to be held
 286  */
 287 static void
 288 arche_platform_poweroff_seq(struct arche_platform_drvdata *arche_pdata)
 289 {
 290         unsigned long flags;
 291
 292         if (arche_pdata->state == ARCHE_PLATFORM_STATE_OFF)
 293                 return;
 294
 295         /* If in fw_flashing mode, then no need to repeate things again */
 296         if (arche_pdata->state != ARCHE_PLATFORM_STATE_FW_FLASHING) {
 297                 disable_irq(arche_pdata->wake_detect_irq);
 298
 299                 spin_lock_irqsave(&arche_pdata->wake_lock, flags);
 300                 arche_platform_set_wake_detect_state(arche_pdata,
 301                                                      WD_STATE_IDLE);
 302                 spin_unlock_irqrestore(&arche_pdata->wake_lock, flags);
 303         }
 304
 305         clk_disable_unprepare(arche_pdata->svc_ref_clk);
 306
 307         /* As part of exit, put APB back in reset state */
 308         svc_reset_onoff(arche_pdata->svc_reset_gpio,
 309                         arche_pdata->is_reset_act_hi);
 310
 311         arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_OFF);
 312 }
 313
 314 static ssize_t state_store(struct device *dev,
 315                            struct device_attribute *attr,
 316                            const char *buf, size_t count)
 317 {
 318         struct arche_platform_drvdata *arche_pdata = dev_get_drvdata(dev);
 319         int ret = 0;
 320
 321         mutex_lock(&arche_pdata->platform_state_mutex);
 322
 323         if (sysfs_streq(buf, "off")) {
 324                 if (arche_pdata->state == ARCHE_PLATFORM_STATE_OFF)
 325                         goto exit;
 326
 327                 /*  If SVC goes down, bring down APB's as well */
 328                 device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
 329
 330                 arche_platform_poweroff_seq(arche_pdata);
 331
 332         } else if (sysfs_streq(buf, "active")) {
 333                 if (arche_pdata->state == ARCHE_PLATFORM_STATE_ACTIVE)
 334                         goto exit;
 335
 336                 /* First we want to make sure we power off everything
 337                  * and then activate back again
 338                  */
 339                 device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
 340                 arche_platform_poweroff_seq(arche_pdata);
 341
 342                 arche_platform_wd_irq_en(arche_pdata);
 343                 ret = arche_platform_coldboot_seq(arche_pdata);
 344                 if (ret)
 345                         goto exit;
 346
 347         } else if (sysfs_streq(buf, "standby")) {
 348                 if (arche_pdata->state == ARCHE_PLATFORM_STATE_STANDBY)
 349                         goto exit;
 350
 351                 dev_warn(arche_pdata->dev, "standby state not supported\n");
 352         } else if (sysfs_streq(buf, "fw_flashing")) {
 353                 if (arche_pdata->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
 354                         goto exit;
 355
 356                 /*
 357                  * Here we only control SVC.
 358                  *
 359                  * In case of FW_FLASHING mode we do not want to control
 360                  * APBs, as in case of V2, SPI bus is shared between both
 361                  * the APBs. So let user chose which APB he wants to flash.
 362                  */
 363                 arche_platform_poweroff_seq(arche_pdata);
 364
 365                 ret = arche_platform_fw_flashing_seq(arche_pdata);
 366                 if (ret)
 367                         goto exit;
 368         } else {
 369                 dev_err(arche_pdata->dev, "unknown state\n");
 370                 ret = -EINVAL;
 371         }
 372
 373 exit:
 374         mutex_unlock(&arche_pdata->platform_state_mutex);
 375         return ret ? ret : count;
 376 }
 377
 378 static ssize_t state_show(struct device *dev,
 379                           struct device_attribute *attr, char *buf)
 380 {
 381         struct arche_platform_drvdata *arche_pdata = dev_get_drvdata(dev);
 382
 383         switch (arche_pdata->state) {
 384         case ARCHE_PLATFORM_STATE_OFF:
 385                 return sprintf(buf, "off\n");
 386         case ARCHE_PLATFORM_STATE_ACTIVE:
 387                 return sprintf(buf, "active\n");
 388         case ARCHE_PLATFORM_STATE_STANDBY:
 389                 return sprintf(buf, "standby\n");
 390         case ARCHE_PLATFORM_STATE_FW_FLASHING:
 391                 return sprintf(buf, "fw_flashing\n");
 392         default:
 393                 return sprintf(buf, "unknown state\n");
 394         }
 395 }
 396
 397 static DEVICE_ATTR_RW(state);
 398
 399 static int arche_platform_pm_notifier(struct notifier_block *notifier,
 400                                       unsigned long pm_event, void *unused)
 401 {
 402         struct arche_platform_drvdata *arche_pdata =
 403                 container_of(notifier, struct arche_platform_drvdata,
 404                              pm_notifier);
 405         int ret = NOTIFY_DONE;
 406
 407         mutex_lock(&arche_pdata->platform_state_mutex);
 408         switch (pm_event) {
 409         case PM_SUSPEND_PREPARE:
 410                 if (arche_pdata->state != ARCHE_PLATFORM_STATE_ACTIVE) {
 411                         ret = NOTIFY_STOP;
 412                         break;
 413                 }
 414                 device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);
 415                 arche_platform_poweroff_seq(arche_pdata);
 416                 break;
 417         case PM_POST_SUSPEND:
 418                 if (arche_pdata->state != ARCHE_PLATFORM_STATE_OFF)
 419                         break;
 420
 421                 arche_platform_wd_irq_en(arche_pdata);
 422                 arche_platform_coldboot_seq(arche_pdata);
 423                 break;
 424         default:
 425                 break;
 426         }
 427         mutex_unlock(&arche_pdata->platform_state_mutex);
 428
 429         return ret;
 430 }
 431
 432 static int arche_platform_probe(struct platform_device *pdev)
 433 {
 434         struct arche_platform_drvdata *arche_pdata;
 435         struct device *dev = &pdev->dev;
 436         struct device_node *np = dev->of_node;
 437         int ret;
 438
 439         arche_pdata = devm_kzalloc(&pdev->dev, sizeof(*arche_pdata),
 440                                    GFP_KERNEL);
 441         if (!arche_pdata)
 442                 return -ENOMEM;
 443
 444         /* setup svc reset gpio */
 445         arche_pdata->is_reset_act_hi = of_property_read_bool(np,
 446                                                              "svc,reset-active-high");
 447         arche_pdata->svc_reset_gpio = of_get_named_gpio(np,
 448                                                         "svc,reset-gpio",
 449                                                         0);
 450         if (!gpio_is_valid(arche_pdata->svc_reset_gpio)) {
 451                 dev_err(dev, "failed to get reset-gpio\n");
 452                 return arche_pdata->svc_reset_gpio;
 453         }
 454         ret = devm_gpio_request(dev, arche_pdata->svc_reset_gpio, "svc-reset");
 455         if (ret) {
 456                 dev_err(dev, "failed to request svc-reset gpio:%d\n", ret);
 457                 return ret;
 458         }
 459         ret = gpio_direction_output(arche_pdata->svc_reset_gpio,
 460                                     arche_pdata->is_reset_act_hi);
 461         if (ret) {
 462                 dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
 463                 return ret;
 464         }
 465         arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_OFF);
 466
 467         arche_pdata->svc_sysboot_gpio = of_get_named_gpio(np,
 468                                                           "svc,sysboot-gpio",
 469                                                           0);
 470         if (!gpio_is_valid(arche_pdata->svc_sysboot_gpio)) {
 471                 dev_err(dev, "failed to get sysboot gpio\n");
 472                 return arche_pdata->svc_sysboot_gpio;
 473         }
 474         ret = devm_gpio_request(dev, arche_pdata->svc_sysboot_gpio, "sysboot0");
 475         if (ret) {
 476                 dev_err(dev, "failed to request sysboot0 gpio:%d\n", ret);
 477                 return ret;
 478         }
 479         ret = gpio_direction_output(arche_pdata->svc_sysboot_gpio, 0);
 480         if (ret) {
 481                 dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
 482                 return ret;
 483         }
 484
 485         /* setup the clock request gpio first */
 486         arche_pdata->svc_refclk_req = of_get_named_gpio(np,
 487                                                         "svc,refclk-req-gpio",
 488                                                         0);
 489         if (!gpio_is_valid(arche_pdata->svc_refclk_req)) {
 490                 dev_err(dev, "failed to get svc clock-req gpio\n");
 491                 return arche_pdata->svc_refclk_req;
 492         }
 493         ret = devm_gpio_request(dev, arche_pdata->svc_refclk_req,
 494                                 "svc-clk-req");
 495         if (ret) {
 496                 dev_err(dev, "failed to request svc-clk-req gpio: %d\n", ret);
 497                 return ret;
 498         }
 499         ret = gpio_direction_input(arche_pdata->svc_refclk_req);
 500         if (ret) {
 501                 dev_err(dev, "failed to set svc-clk-req gpio dir :%d\n", ret);
 502                 return ret;
 503         }
 504
 505         /* setup refclk2 to follow the pin */
 506         arche_pdata->svc_ref_clk = devm_clk_get(dev, "svc_ref_clk");
 507         if (IS_ERR(arche_pdata->svc_ref_clk)) {
 508                 ret = PTR_ERR(arche_pdata->svc_ref_clk);
 509                 dev_err(dev, "failed to get svc_ref_clk: %d\n", ret);
 510                 return ret;
 511         }
 512
 513         platform_set_drvdata(pdev, arche_pdata);
 514
 515         arche_pdata->num_apbs = of_get_child_count(np);
 516         dev_dbg(dev, "Number of APB's available - %d\n", arche_pdata->num_apbs);
 517
 518         arche_pdata->wake_detect_gpio = of_get_named_gpio(np,
 519                                                           "svc,wake-detect-gpio",
 520                                                           0);
 521         if (arche_pdata->wake_detect_gpio < 0) {
 522                 dev_err(dev, "failed to get wake detect gpio\n");
 523                 return arche_pdata->wake_detect_gpio;
 524         }
 525
 526         ret = devm_gpio_request(dev, arche_pdata->wake_detect_gpio,
 527                                 "wake detect");
 528         if (ret) {
 529                 dev_err(dev, "Failed requesting wake_detect gpio %d\n",
 530                         arche_pdata->wake_detect_gpio);
 531                 return ret;
 532         }
 533
 534         arche_platform_set_wake_detect_state(arche_pdata, WD_STATE_IDLE);
 535
 536         arche_pdata->dev = &pdev->dev;
 537
 538         spin_lock_init(&arche_pdata->wake_lock);
 539         mutex_init(&arche_pdata->platform_state_mutex);
 540         arche_pdata->wake_detect_irq =
 541                 gpio_to_irq(arche_pdata->wake_detect_gpio);
 542
 543         ret = devm_request_threaded_irq(dev, arche_pdata->wake_detect_irq,
 544                                         arche_platform_wd_irq,
 545                                         arche_platform_wd_irq_thread,
 546                                         IRQF_TRIGGER_FALLING |
 547                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 548                                         dev_name(dev), arche_pdata);
 549         if (ret) {
 550                 dev_err(dev, "failed to request wake detect IRQ %d\n", ret);
 551                 return ret;
 552         }
 553         disable_irq(arche_pdata->wake_detect_irq);
 554
 555         ret = device_create_file(dev, &dev_attr_state);
 556         if (ret) {
 557                 dev_err(dev, "failed to create state file in sysfs\n");
 558                 return ret;
 559         }
 560
 561         ret = of_platform_populate(np, NULL, NULL, dev);
 562         if (ret) {
 563                 dev_err(dev, "failed to populate child nodes %d\n", ret);
 564                 goto err_device_remove;
 565         }
 566
 567         arche_pdata->pm_notifier.notifier_call = arche_platform_pm_notifier;
 568         ret = register_pm_notifier(&arche_pdata->pm_notifier);
 569
 570         if (ret) {
 571                 dev_err(dev, "failed to register pm notifier %d\n", ret);
 572                 goto err_device_remove;
 573         }
 574
 575         /* Explicitly power off if requested */
 576         if (!of_property_read_bool(pdev->dev.of_node, "arche,init-off")) {
 577                 mutex_lock(&arche_pdata->platform_state_mutex);
 578                 ret = arche_platform_coldboot_seq(arche_pdata);
 579                 if (ret) {
 580                         dev_err(dev, "Failed to cold boot svc %d\n", ret);
 581                         goto err_coldboot;
 582                 }
 583                 arche_platform_wd_irq_en(arche_pdata);
 584                 mutex_unlock(&arche_pdata->platform_state_mutex);
 585         }
 586
 587         dev_info(dev, "Device registered successfully\n");
 588         return 0;
 589
 590 err_coldboot:
 591         mutex_unlock(&arche_pdata->platform_state_mutex);
 592 err_device_remove:
 593         device_remove_file(&pdev->dev, &dev_attr_state);
 594         return ret;
 595 }
 596
 597 static int arche_remove_child(struct device *dev, void *unused)
 598 {
 599         struct platform_device *pdev = to_platform_device(dev);
 600
 601         platform_device_unregister(pdev);
 602
 603         return 0;
 604 }
 605
 606 static int arche_platform_remove(struct platform_device *pdev)
 607 {
 608         struct arche_platform_drvdata *arche_pdata = platform_get_drvdata(pdev);
 609
 610         unregister_pm_notifier(&arche_pdata->pm_notifier);
 611         device_remove_file(&pdev->dev, &dev_attr_state);
 612         device_for_each_child(&pdev->dev, NULL, arche_remove_child);
 613         arche_platform_poweroff_seq(arche_pdata);
 614
 615         if (usb3613_hub_mode_ctrl(false))
 616                 dev_warn(arche_pdata->dev, "failed to control hub device\n");
 617                 /* TODO: Should we do anything more here ?? */
 618         return 0;
 619 }
 620
 621 static __maybe_unused int arche_platform_suspend(struct device *dev)
 622 {
 623         /*
 624          * If timing profile premits, we may shutdown bridge
 625          * completely
 626          *
 627          * TODO: sequence ??
 628          *
 629          * Also, need to make sure we meet precondition for unipro suspend
 630          * Precondition: Definition ???
 631          */
 632         return 0;
 633 }
 634
 635 static __maybe_unused int arche_platform_resume(struct device *dev)
 636 {
 637         /*
 638          * Atleast for ES2 we have to meet the delay requirement between
 639          * unipro switch and AP bridge init, depending on whether bridge is in
 640          * OFF state or standby state.
 641          *
 642          * Based on whether bridge is in standby or OFF state we may have to
 643          * assert multiple signals. Please refer to WDM spec, for more info.
 644          *
 645          */
 646         return 0;
 647 }
 648
 649 static void arche_platform_shutdown(struct platform_device *pdev)
 650 {
 651         struct arche_platform_drvdata *arche_pdata = platform_get_drvdata(pdev);
 652
 653         arche_platform_poweroff_seq(arche_pdata);
 654
 655         usb3613_hub_mode_ctrl(false);
 656 }
 657
 658 static SIMPLE_DEV_PM_OPS(arche_platform_pm_ops,
 659                         arche_platform_suspend,
 660                         arche_platform_resume);
 661
 662 static const struct of_device_id arche_platform_of_match[] = {
 663         /* Use PID/VID of SVC device */
 664         { .compatible = "google,arche-platform", },
 665         { },
 666 };
 667
 668 static const struct of_device_id arche_combined_id[] = {
 669         /* Use PID/VID of SVC device */
 670         { .compatible = "google,arche-platform", },
 671         { .compatible = "usbffff,2", },
 672         { },
 673 };
 674 MODULE_DEVICE_TABLE(of, arche_combined_id);
 675
 676 static struct platform_driver arche_platform_device_driver = {
 677         .probe          = arche_platform_probe,
 678         .remove         = arche_platform_remove,
 679         .shutdown       = arche_platform_shutdown,
 680         .driver         = {
 681                 .name   = "arche-platform-ctrl",
 682                 .pm     = &arche_platform_pm_ops,
 683                 .of_match_table = arche_platform_of_match,
 684         }
 685 };
 686
 687 static int __init arche_init(void)
 688 {
 689         int retval;
 690
 691         retval = platform_driver_register(&arche_platform_device_driver);
 692         if (retval)
 693                 return retval;
 694
 695         retval = arche_apb_init();
 696         if (retval)
 697                 platform_driver_unregister(&arche_platform_device_driver);
 698
 699         return retval;
 700 }
 701 module_init(arche_init);
 702
 703 static void __exit arche_exit(void)
 704 {
 705         arche_apb_exit();
 706         platform_driver_unregister(&arche_platform_device_driver);
 707 }
 708 module_exit(arche_exit);
 709
 710 MODULE_LICENSE("GPL v2");
 711 MODULE_AUTHOR("Vaibhav Hiremath <vaibhav.hiremath@linaro.org>");
 712 MODULE_DESCRIPTION("Arche Platform Driver");