kernel/drivers/usb/chipidea/ci_hdrc_imx.c

   1 /*
   2  * Copyright 2012 Freescale Semiconductor, Inc.
   3  * Copyright (C) 2012 Marek Vasut <marex@denx.de>
   4  * on behalf of DENX Software Engineering GmbH
   5  *
   6  * The code contained herein is licensed under the GNU General Public
   7  * License. You may obtain a copy of the GNU General Public License
   8  * Version 2 or later at the following locations:
   9  *
  10  * http://www.opensource.org/licenses/gpl-license.html
  11  * http://www.gnu.org/copyleft/gpl.html
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/of_gpio.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/usb/chipidea.h>
  21 #include <linux/clk.h>
  22
  23 #include "ci.h"
  24 #include "ci_hdrc_imx.h"
  25
  26 struct ci_hdrc_imx_platform_flag {
  27         unsigned int flags;
  28         bool runtime_pm;
  29 };
  30
  31 static const struct ci_hdrc_imx_platform_flag imx27_usb_data = {
  32                 CI_HDRC_DISABLE_STREAMING,
  33 };
  34
  35 static const struct ci_hdrc_imx_platform_flag imx28_usb_data = {
  36         .flags = CI_HDRC_IMX28_WRITE_FIX |
  37                 CI_HDRC_TURN_VBUS_EARLY_ON |
  38                 CI_HDRC_DISABLE_STREAMING,
  39 };
  40
  41 static const struct ci_hdrc_imx_platform_flag imx6q_usb_data = {
  42         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
  43                 CI_HDRC_TURN_VBUS_EARLY_ON |
  44                 CI_HDRC_DISABLE_STREAMING,
  45 };
  46
  47 static const struct ci_hdrc_imx_platform_flag imx6sl_usb_data = {
  48         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
  49                 CI_HDRC_TURN_VBUS_EARLY_ON |
  50                 CI_HDRC_DISABLE_HOST_STREAMING,
  51 };
  52
  53 static const struct ci_hdrc_imx_platform_flag imx6sx_usb_data = {
  54         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
  55                 CI_HDRC_TURN_VBUS_EARLY_ON |
  56                 CI_HDRC_DISABLE_HOST_STREAMING,
  57 };
  58
  59 static const struct ci_hdrc_imx_platform_flag imx6ul_usb_data = {
  60         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
  61                 CI_HDRC_TURN_VBUS_EARLY_ON,
  62 };
  63
  64 static const struct ci_hdrc_imx_platform_flag imx7d_usb_data = {
  65         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM,
  66 };
  67
  68 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
  69         { .compatible = "fsl,imx28-usb", .data = &imx28_usb_data},
  70         { .compatible = "fsl,imx27-usb", .data = &imx27_usb_data},
  71         { .compatible = "fsl,imx6q-usb", .data = &imx6q_usb_data},
  72         { .compatible = "fsl,imx6sl-usb", .data = &imx6sl_usb_data},
  73         { .compatible = "fsl,imx6sx-usb", .data = &imx6sx_usb_data},
  74         { .compatible = "fsl,imx6ul-usb", .data = &imx6ul_usb_data},
  75         { .compatible = "fsl,imx7d-usb", .data = &imx7d_usb_data},
  76         { /* sentinel */ }
  77 };
  78 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids);
  79
  80 struct ci_hdrc_imx_data {
  81         struct usb_phy *phy;
  82         struct platform_device *ci_pdev;
  83         struct clk *clk;
  84         struct imx_usbmisc_data *usbmisc_data;
  85         bool supports_runtime_pm;
  86         bool in_lpm;
  87         /* SoC before i.mx6 (except imx23/imx28) needs three clks */
  88         bool need_three_clks;
  89         struct clk *clk_ipg;
  90         struct clk *clk_ahb;
  91         struct clk *clk_per;
  92         /* --------------------------------- */
  93 };
  94
  95 /* Common functions shared by usbmisc drivers */
  96
  97 static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
  98 {
  99         struct platform_device *misc_pdev;
 100         struct device_node *np = dev->of_node;
 101         struct of_phandle_args args;
 102         struct imx_usbmisc_data *data;
 103         int ret;
 104
 105         /*
 106          * In case the fsl,usbmisc property is not present this device doesn't
 107          * need usbmisc. Return NULL (which is no error here)
 108          */
 109         if (!of_get_property(np, "fsl,usbmisc", NULL))
 110                 return NULL;
 111
 112         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 113         if (!data)
 114                 return ERR_PTR(-ENOMEM);
 115
 116         ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
 117                                         0, &args);
 118         if (ret) {
 119                 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
 120                         ret);
 121                 return ERR_PTR(ret);
 122         }
 123
 124         data->index = args.args[0];
 125
 126         misc_pdev = of_find_device_by_node(args.np);
 127         of_node_put(args.np);
 128
 129         if (!misc_pdev || !platform_get_drvdata(misc_pdev))
 130                 return ERR_PTR(-EPROBE_DEFER);
 131
 132         data->dev = &misc_pdev->dev;
 133
 134         if (of_find_property(np, "disable-over-current", NULL))
 135                 data->disable_oc = 1;
 136
 137         if (of_find_property(np, "external-vbus-divider", NULL))
 138                 data->evdo = 1;
 139
 140         return data;
 141 }
 142
 143 /* End of common functions shared by usbmisc drivers*/
 144 static int imx_get_clks(struct device *dev)
 145 {
 146         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 147         int ret = 0;
 148
 149         data->clk_ipg = devm_clk_get(dev, "ipg");
 150         if (IS_ERR(data->clk_ipg)) {
 151                 /* If the platform only needs one clocks */
 152                 data->clk = devm_clk_get(dev, NULL);
 153                 if (IS_ERR(data->clk)) {
 154                         ret = PTR_ERR(data->clk);
 155                         dev_err(dev,
 156                                 "Failed to get clks, err=%ld,%ld\n",
 157                                 PTR_ERR(data->clk), PTR_ERR(data->clk_ipg));
 158                         return ret;
 159                 }
 160                 return ret;
 161         }
 162
 163         data->clk_ahb = devm_clk_get(dev, "ahb");
 164         if (IS_ERR(data->clk_ahb)) {
 165                 ret = PTR_ERR(data->clk_ahb);
 166                 dev_err(dev,
 167                         "Failed to get ahb clock, err=%d\n", ret);
 168                 return ret;
 169         }
 170
 171         data->clk_per = devm_clk_get(dev, "per");
 172         if (IS_ERR(data->clk_per)) {
 173                 ret = PTR_ERR(data->clk_per);
 174                 dev_err(dev,
 175                         "Failed to get per clock, err=%d\n", ret);
 176                 return ret;
 177         }
 178
 179         data->need_three_clks = true;
 180         return ret;
 181 }
 182
 183 static int imx_prepare_enable_clks(struct device *dev)
 184 {
 185         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 186         int ret = 0;
 187
 188         if (data->need_three_clks) {
 189                 ret = clk_prepare_enable(data->clk_ipg);
 190                 if (ret) {
 191                         dev_err(dev,
 192                                 "Failed to prepare/enable ipg clk, err=%d\n",
 193                                 ret);
 194                         return ret;
 195                 }
 196
 197                 ret = clk_prepare_enable(data->clk_ahb);
 198                 if (ret) {
 199                         dev_err(dev,
 200                                 "Failed to prepare/enable ahb clk, err=%d\n",
 201                                 ret);
 202                         clk_disable_unprepare(data->clk_ipg);
 203                         return ret;
 204                 }
 205
 206                 ret = clk_prepare_enable(data->clk_per);
 207                 if (ret) {
 208                         dev_err(dev,
 209                                 "Failed to prepare/enable per clk, err=%d\n",
 210                                 ret);
 211                         clk_disable_unprepare(data->clk_ahb);
 212                         clk_disable_unprepare(data->clk_ipg);
 213                         return ret;
 214                 }
 215         } else {
 216                 ret = clk_prepare_enable(data->clk);
 217                 if (ret) {
 218                         dev_err(dev,
 219                                 "Failed to prepare/enable clk, err=%d\n",
 220                                 ret);
 221                         return ret;
 222                 }
 223         }
 224
 225         return ret;
 226 }
 227
 228 static void imx_disable_unprepare_clks(struct device *dev)
 229 {
 230         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 231
 232         if (data->need_three_clks) {
 233                 clk_disable_unprepare(data->clk_per);
 234                 clk_disable_unprepare(data->clk_ahb);
 235                 clk_disable_unprepare(data->clk_ipg);
 236         } else {
 237                 clk_disable_unprepare(data->clk);
 238         }
 239 }
 240
 241 static int ci_hdrc_imx_probe(struct platform_device *pdev)
 242 {
 243         struct ci_hdrc_imx_data *data;
 244         struct ci_hdrc_platform_data pdata = {
 245                 .name           = dev_name(&pdev->dev),
 246                 .capoffset      = DEF_CAPOFFSET,
 247                 .flags          = CI_HDRC_SET_NON_ZERO_TTHA,
 248         };
 249         int ret;
 250         const struct of_device_id *of_id;
 251         const struct ci_hdrc_imx_platform_flag *imx_platform_flag;
 252
 253         of_id = of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev);
 254         if (!of_id)
 255                 return -ENODEV;
 256
 257         imx_platform_flag = of_id->data;
 258
 259         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 260         if (!data)
 261                 return -ENOMEM;
 262
 263         platform_set_drvdata(pdev, data);
 264         data->usbmisc_data = usbmisc_get_init_data(&pdev->dev);
 265         if (IS_ERR(data->usbmisc_data))
 266                 return PTR_ERR(data->usbmisc_data);
 267
 268         ret = imx_get_clks(&pdev->dev);
 269         if (ret)
 270                 return ret;
 271
 272         ret = imx_prepare_enable_clks(&pdev->dev);
 273         if (ret)
 274                 return ret;
 275
 276         data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 277         if (IS_ERR(data->phy)) {
 278                 ret = PTR_ERR(data->phy);
 279                 /* Return -EINVAL if no usbphy is available */
 280                 if (ret == -ENODEV)
 281                         ret = -EINVAL;
 282                 goto err_clk;
 283         }
 284
 285         pdata.usb_phy = data->phy;
 286         pdata.flags |= imx_platform_flag->flags;
 287         if (pdata.flags & CI_HDRC_SUPPORTS_RUNTIME_PM)
 288                 data->supports_runtime_pm = true;
 289
 290         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 291         if (ret)
 292                 goto err_clk;
 293
 294         ret = imx_usbmisc_init(data->usbmisc_data);
 295         if (ret) {
 296                 dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n", ret);
 297                 goto err_clk;
 298         }
 299
 300         data->ci_pdev = ci_hdrc_add_device(&pdev->dev,
 301                                 pdev->resource, pdev->num_resources,
 302                                 &pdata);
 303         if (IS_ERR(data->ci_pdev)) {
 304                 ret = PTR_ERR(data->ci_pdev);
 305                 dev_err(&pdev->dev,
 306                         "Can't register ci_hdrc platform device, err=%d\n",
 307                         ret);
 308                 goto err_clk;
 309         }
 310
 311         ret = imx_usbmisc_init_post(data->usbmisc_data);
 312         if (ret) {
 313                 dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n", ret);
 314                 goto disable_device;
 315         }
 316
 317         if (data->supports_runtime_pm) {
 318                 pm_runtime_set_active(&pdev->dev);
 319                 pm_runtime_enable(&pdev->dev);
 320         }
 321
 322         device_set_wakeup_capable(&pdev->dev, true);
 323
 324         return 0;
 325
 326 disable_device:
 327         ci_hdrc_remove_device(data->ci_pdev);
 328 err_clk:
 329         imx_disable_unprepare_clks(&pdev->dev);
 330         return ret;
 331 }
 332
 333 static int ci_hdrc_imx_remove(struct platform_device *pdev)
 334 {
 335         struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev);
 336
 337         if (data->supports_runtime_pm) {
 338                 pm_runtime_get_sync(&pdev->dev);
 339                 pm_runtime_disable(&pdev->dev);
 340                 pm_runtime_put_noidle(&pdev->dev);
 341         }
 342         ci_hdrc_remove_device(data->ci_pdev);
 343         imx_disable_unprepare_clks(&pdev->dev);
 344
 345         return 0;
 346 }
 347
 348 #ifdef CONFIG_PM
 349 static int imx_controller_suspend(struct device *dev)
 350 {
 351         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 352
 353         dev_dbg(dev, "at %s\n", __func__);
 354
 355         imx_disable_unprepare_clks(dev);
 356         data->in_lpm = true;
 357
 358         return 0;
 359 }
 360
 361 static int imx_controller_resume(struct device *dev)
 362 {
 363         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 364         int ret = 0;
 365
 366         dev_dbg(dev, "at %s\n", __func__);
 367
 368         if (!data->in_lpm) {
 369                 WARN_ON(1);
 370                 return 0;
 371         }
 372
 373         ret = imx_prepare_enable_clks(dev);
 374         if (ret)
 375                 return ret;
 376
 377         data->in_lpm = false;
 378
 379         ret = imx_usbmisc_set_wakeup(data->usbmisc_data, false);
 380         if (ret) {
 381                 dev_err(dev, "usbmisc set_wakeup failed, ret=%d\n", ret);
 382                 goto clk_disable;
 383         }
 384
 385         return 0;
 386
 387 clk_disable:
 388         imx_disable_unprepare_clks(dev);
 389         return ret;
 390 }
 391
 392 #ifdef CONFIG_PM_SLEEP
 393 static int ci_hdrc_imx_suspend(struct device *dev)
 394 {
 395         int ret;
 396
 397         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 398
 399         if (data->in_lpm)
 400                 /* The core's suspend doesn't run */
 401                 return 0;
 402
 403         if (device_may_wakeup(dev)) {
 404                 ret = imx_usbmisc_set_wakeup(data->usbmisc_data, true);
 405                 if (ret) {
 406                         dev_err(dev, "usbmisc set_wakeup failed, ret=%d\n",
 407                                         ret);
 408                         return ret;
 409                 }
 410         }
 411
 412         return imx_controller_suspend(dev);
 413 }
 414
 415 static int ci_hdrc_imx_resume(struct device *dev)
 416 {
 417         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 418         int ret;
 419
 420         ret = imx_controller_resume(dev);
 421         if (!ret && data->supports_runtime_pm) {
 422                 pm_runtime_disable(dev);
 423                 pm_runtime_set_active(dev);
 424                 pm_runtime_enable(dev);
 425         }
 426
 427         return ret;
 428 }
 429 #endif /* CONFIG_PM_SLEEP */
 430
 431 static int ci_hdrc_imx_runtime_suspend(struct device *dev)
 432 {
 433         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 434         int ret;
 435
 436         if (data->in_lpm) {
 437                 WARN_ON(1);
 438                 return 0;
 439         }
 440
 441         ret = imx_usbmisc_set_wakeup(data->usbmisc_data, true);
 442         if (ret) {
 443                 dev_err(dev, "usbmisc set_wakeup failed, ret=%d\n", ret);
 444                 return ret;
 445         }
 446
 447         return imx_controller_suspend(dev);
 448 }
 449
 450 static int ci_hdrc_imx_runtime_resume(struct device *dev)
 451 {
 452         return imx_controller_resume(dev);
 453 }
 454
 455 #endif /* CONFIG_PM */
 456
 457 static const struct dev_pm_ops ci_hdrc_imx_pm_ops = {
 458         SET_SYSTEM_SLEEP_PM_OPS(ci_hdrc_imx_suspend, ci_hdrc_imx_resume)
 459         SET_RUNTIME_PM_OPS(ci_hdrc_imx_runtime_suspend,
 460                         ci_hdrc_imx_runtime_resume, NULL)
 461 };
 462 static struct platform_driver ci_hdrc_imx_driver = {
 463         .probe = ci_hdrc_imx_probe,
 464         .remove = ci_hdrc_imx_remove,
 465         .driver = {
 466                 .name = "imx_usb",
 467                 .of_match_table = ci_hdrc_imx_dt_ids,
 468                 .pm = &ci_hdrc_imx_pm_ops,
 469          },
 470 };
 471
 472 module_platform_driver(ci_hdrc_imx_driver);
 473
 474 MODULE_ALIAS("platform:imx-usb");
 475 MODULE_LICENSE("GPL v2");
 476 MODULE_DESCRIPTION("CI HDRC i.MX USB binding");
 477 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 478 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");