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 imx23_usb_data = {
  32         .flags = CI_HDRC_TURN_VBUS_EARLY_ON |
  33                 CI_HDRC_DISABLE_STREAMING,
  34 };
  35
  36 static const struct ci_hdrc_imx_platform_flag imx27_usb_data = {
  37                 CI_HDRC_DISABLE_STREAMING,
  38 };
  39
  40 static const struct ci_hdrc_imx_platform_flag imx28_usb_data = {
  41         .flags = CI_HDRC_IMX28_WRITE_FIX |
  42                 CI_HDRC_TURN_VBUS_EARLY_ON |
  43                 CI_HDRC_DISABLE_STREAMING,
  44 };
  45
  46 static const struct ci_hdrc_imx_platform_flag imx6q_usb_data = {
  47         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
  48                 CI_HDRC_TURN_VBUS_EARLY_ON |
  49                 CI_HDRC_DISABLE_STREAMING,
  50 };
  51
  52 static const struct ci_hdrc_imx_platform_flag imx6sl_usb_data = {
  53         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
  54                 CI_HDRC_TURN_VBUS_EARLY_ON |
  55                 CI_HDRC_DISABLE_HOST_STREAMING,
  56 };
  57
  58 static const struct ci_hdrc_imx_platform_flag imx6sx_usb_data = {
  59         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
  60                 CI_HDRC_TURN_VBUS_EARLY_ON |
  61                 CI_HDRC_DISABLE_HOST_STREAMING,
  62 };
  63
  64 static const struct ci_hdrc_imx_platform_flag imx6ul_usb_data = {
  65         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
  66                 CI_HDRC_TURN_VBUS_EARLY_ON,
  67 };
  68
  69 static const struct ci_hdrc_imx_platform_flag imx7d_usb_data = {
  70         .flags = CI_HDRC_SUPPORTS_RUNTIME_PM,
  71 };
  72
  73 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
  74         { .compatible = "fsl,imx23-usb", .data = &imx23_usb_data},
  75         { .compatible = "fsl,imx28-usb", .data = &imx28_usb_data},
  76         { .compatible = "fsl,imx27-usb", .data = &imx27_usb_data},
  77         { .compatible = "fsl,imx6q-usb", .data = &imx6q_usb_data},
  78         { .compatible = "fsl,imx6sl-usb", .data = &imx6sl_usb_data},
  79         { .compatible = "fsl,imx6sx-usb", .data = &imx6sx_usb_data},
  80         { .compatible = "fsl,imx6ul-usb", .data = &imx6ul_usb_data},
  81         { .compatible = "fsl,imx7d-usb", .data = &imx7d_usb_data},
  82         { /* sentinel */ }
  83 };
  84 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids);
  85
  86 struct ci_hdrc_imx_data {
  87         struct usb_phy *phy;
  88         struct platform_device *ci_pdev;
  89         struct clk *clk;
  90         struct imx_usbmisc_data *usbmisc_data;
  91         bool supports_runtime_pm;
  92         bool in_lpm;
  93         /* SoC before i.mx6 (except imx23/imx28) needs three clks */
  94         bool need_three_clks;
  95         struct clk *clk_ipg;
  96         struct clk *clk_ahb;
  97         struct clk *clk_per;
  98         /* --------------------------------- */
  99 };
 100
 101 /* Common functions shared by usbmisc drivers */
 102
 103 static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
 104 {
 105         struct platform_device *misc_pdev;
 106         struct device_node *np = dev->of_node;
 107         struct of_phandle_args args;
 108         struct imx_usbmisc_data *data;
 109         int ret;
 110
 111         /*
 112          * In case the fsl,usbmisc property is not present this device doesn't
 113          * need usbmisc. Return NULL (which is no error here)
 114          */
 115         if (!of_get_property(np, "fsl,usbmisc", NULL))
 116                 return NULL;
 117
 118         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 119         if (!data)
 120                 return ERR_PTR(-ENOMEM);
 121
 122         ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells",
 123                                         0, &args);
 124         if (ret) {
 125                 dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n",
 126                         ret);
 127                 return ERR_PTR(ret);
 128         }
 129
 130         data->index = args.args[0];
 131
 132         misc_pdev = of_find_device_by_node(args.np);
 133         of_node_put(args.np);
 134
 135         if (!misc_pdev || !platform_get_drvdata(misc_pdev))
 136                 return ERR_PTR(-EPROBE_DEFER);
 137
 138         data->dev = &misc_pdev->dev;
 139
 140         if (of_find_property(np, "disable-over-current", NULL))
 141                 data->disable_oc = 1;
 142
 143         if (of_find_property(np, "external-vbus-divider", NULL))
 144                 data->evdo = 1;
 145
 146         return data;
 147 }
 148
 149 /* End of common functions shared by usbmisc drivers*/
 150 static int imx_get_clks(struct device *dev)
 151 {
 152         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 153         int ret = 0;
 154
 155         data->clk_ipg = devm_clk_get(dev, "ipg");
 156         if (IS_ERR(data->clk_ipg)) {
 157                 /* If the platform only needs one clocks */
 158                 data->clk = devm_clk_get(dev, NULL);
 159                 if (IS_ERR(data->clk)) {
 160                         ret = PTR_ERR(data->clk);
 161                         dev_err(dev,
 162                                 "Failed to get clks, err=%ld,%ld\n",
 163                                 PTR_ERR(data->clk), PTR_ERR(data->clk_ipg));
 164                         return ret;
 165                 }
 166                 return ret;
 167         }
 168
 169         data->clk_ahb = devm_clk_get(dev, "ahb");
 170         if (IS_ERR(data->clk_ahb)) {
 171                 ret = PTR_ERR(data->clk_ahb);
 172                 dev_err(dev,
 173                         "Failed to get ahb clock, err=%d\n", ret);
 174                 return ret;
 175         }
 176
 177         data->clk_per = devm_clk_get(dev, "per");
 178         if (IS_ERR(data->clk_per)) {
 179                 ret = PTR_ERR(data->clk_per);
 180                 dev_err(dev,
 181                         "Failed to get per clock, err=%d\n", ret);
 182                 return ret;
 183         }
 184
 185         data->need_three_clks = true;
 186         return ret;
 187 }
 188
 189 static int imx_prepare_enable_clks(struct device *dev)
 190 {
 191         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 192         int ret = 0;
 193
 194         if (data->need_three_clks) {
 195                 ret = clk_prepare_enable(data->clk_ipg);
 196                 if (ret) {
 197                         dev_err(dev,
 198                                 "Failed to prepare/enable ipg clk, err=%d\n",
 199                                 ret);
 200                         return ret;
 201                 }
 202
 203                 ret = clk_prepare_enable(data->clk_ahb);
 204                 if (ret) {
 205                         dev_err(dev,
 206                                 "Failed to prepare/enable ahb clk, err=%d\n",
 207                                 ret);
 208                         clk_disable_unprepare(data->clk_ipg);
 209                         return ret;
 210                 }
 211
 212                 ret = clk_prepare_enable(data->clk_per);
 213                 if (ret) {
 214                         dev_err(dev,
 215                                 "Failed to prepare/enable per clk, err=%d\n",
 216                                 ret);
 217                         clk_disable_unprepare(data->clk_ahb);
 218                         clk_disable_unprepare(data->clk_ipg);
 219                         return ret;
 220                 }
 221         } else {
 222                 ret = clk_prepare_enable(data->clk);
 223                 if (ret) {
 224                         dev_err(dev,
 225                                 "Failed to prepare/enable clk, err=%d\n",
 226                                 ret);
 227                         return ret;
 228                 }
 229         }
 230
 231         return ret;
 232 }
 233
 234 static void imx_disable_unprepare_clks(struct device *dev)
 235 {
 236         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 237
 238         if (data->need_three_clks) {
 239                 clk_disable_unprepare(data->clk_per);
 240                 clk_disable_unprepare(data->clk_ahb);
 241                 clk_disable_unprepare(data->clk_ipg);
 242         } else {
 243                 clk_disable_unprepare(data->clk);
 244         }
 245 }
 246
 247 static int ci_hdrc_imx_probe(struct platform_device *pdev)
 248 {
 249         struct ci_hdrc_imx_data *data;
 250         struct ci_hdrc_platform_data pdata = {
 251                 .name           = dev_name(&pdev->dev),
 252                 .capoffset      = DEF_CAPOFFSET,
 253         };
 254         int ret;
 255         const struct of_device_id *of_id;
 256         const struct ci_hdrc_imx_platform_flag *imx_platform_flag;
 257
 258         of_id = of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev);
 259         if (!of_id)
 260                 return -ENODEV;
 261
 262         imx_platform_flag = of_id->data;
 263
 264         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 265         if (!data)
 266                 return -ENOMEM;
 267
 268         platform_set_drvdata(pdev, data);
 269         data->usbmisc_data = usbmisc_get_init_data(&pdev->dev);
 270         if (IS_ERR(data->usbmisc_data))
 271                 return PTR_ERR(data->usbmisc_data);
 272
 273         ret = imx_get_clks(&pdev->dev);
 274         if (ret)
 275                 return ret;
 276
 277         ret = imx_prepare_enable_clks(&pdev->dev);
 278         if (ret)
 279                 return ret;
 280
 281         data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 282         if (IS_ERR(data->phy)) {
 283                 ret = PTR_ERR(data->phy);
 284                 /* Return -EINVAL if no usbphy is available */
 285                 if (ret == -ENODEV)
 286                         ret = -EINVAL;
 287                 goto err_clk;
 288         }
 289
 290         pdata.usb_phy = data->phy;
 291         pdata.flags |= imx_platform_flag->flags;
 292         if (pdata.flags & CI_HDRC_SUPPORTS_RUNTIME_PM)
 293                 data->supports_runtime_pm = true;
 294
 295         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 296         if (ret)
 297                 goto err_clk;
 298
 299         ret = imx_usbmisc_init(data->usbmisc_data);
 300         if (ret) {
 301                 dev_err(&pdev->dev, "usbmisc init failed, ret=%d\n", ret);
 302                 goto err_clk;
 303         }
 304
 305         data->ci_pdev = ci_hdrc_add_device(&pdev->dev,
 306                                 pdev->resource, pdev->num_resources,
 307                                 &pdata);
 308         if (IS_ERR(data->ci_pdev)) {
 309                 ret = PTR_ERR(data->ci_pdev);
 310                 if (ret != -EPROBE_DEFER)
 311                         dev_err(&pdev->dev,
 312                                 "ci_hdrc_add_device failed, err=%d\n", ret);
 313                 goto err_clk;
 314         }
 315
 316         ret = imx_usbmisc_init_post(data->usbmisc_data);
 317         if (ret) {
 318                 dev_err(&pdev->dev, "usbmisc post failed, ret=%d\n", ret);
 319                 goto disable_device;
 320         }
 321
 322         if (data->supports_runtime_pm) {
 323                 pm_runtime_set_active(&pdev->dev);
 324                 pm_runtime_enable(&pdev->dev);
 325         }
 326
 327         device_set_wakeup_capable(&pdev->dev, true);
 328
 329         return 0;
 330
 331 disable_device:
 332         ci_hdrc_remove_device(data->ci_pdev);
 333 err_clk:
 334         imx_disable_unprepare_clks(&pdev->dev);
 335         return ret;
 336 }
 337
 338 static int ci_hdrc_imx_remove(struct platform_device *pdev)
 339 {
 340         struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev);
 341
 342         if (data->supports_runtime_pm) {
 343                 pm_runtime_get_sync(&pdev->dev);
 344                 pm_runtime_disable(&pdev->dev);
 345                 pm_runtime_put_noidle(&pdev->dev);
 346         }
 347         ci_hdrc_remove_device(data->ci_pdev);
 348         imx_disable_unprepare_clks(&pdev->dev);
 349
 350         return 0;
 351 }
 352
 353 static void ci_hdrc_imx_shutdown(struct platform_device *pdev)
 354 {
 355         ci_hdrc_imx_remove(pdev);
 356 }
 357
 358 #ifdef CONFIG_PM
 359 static int imx_controller_suspend(struct device *dev)
 360 {
 361         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 362
 363         dev_dbg(dev, "at %s\n", __func__);
 364
 365         imx_disable_unprepare_clks(dev);
 366         data->in_lpm = true;
 367
 368         return 0;
 369 }
 370
 371 static int imx_controller_resume(struct device *dev)
 372 {
 373         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 374         int ret = 0;
 375
 376         dev_dbg(dev, "at %s\n", __func__);
 377
 378         if (!data->in_lpm) {
 379                 WARN_ON(1);
 380                 return 0;
 381         }
 382
 383         ret = imx_prepare_enable_clks(dev);
 384         if (ret)
 385                 return ret;
 386
 387         data->in_lpm = false;
 388
 389         ret = imx_usbmisc_set_wakeup(data->usbmisc_data, false);
 390         if (ret) {
 391                 dev_err(dev, "usbmisc set_wakeup failed, ret=%d\n", ret);
 392                 goto clk_disable;
 393         }
 394
 395         return 0;
 396
 397 clk_disable:
 398         imx_disable_unprepare_clks(dev);
 399         return ret;
 400 }
 401
 402 #ifdef CONFIG_PM_SLEEP
 403 static int ci_hdrc_imx_suspend(struct device *dev)
 404 {
 405         int ret;
 406
 407         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 408
 409         if (data->in_lpm)
 410                 /* The core's suspend doesn't run */
 411                 return 0;
 412
 413         if (device_may_wakeup(dev)) {
 414                 ret = imx_usbmisc_set_wakeup(data->usbmisc_data, true);
 415                 if (ret) {
 416                         dev_err(dev, "usbmisc set_wakeup failed, ret=%d\n",
 417                                         ret);
 418                         return ret;
 419                 }
 420         }
 421
 422         return imx_controller_suspend(dev);
 423 }
 424
 425 static int ci_hdrc_imx_resume(struct device *dev)
 426 {
 427         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 428         int ret;
 429
 430         ret = imx_controller_resume(dev);
 431         if (!ret && data->supports_runtime_pm) {
 432                 pm_runtime_disable(dev);
 433                 pm_runtime_set_active(dev);
 434                 pm_runtime_enable(dev);
 435         }
 436
 437         return ret;
 438 }
 439 #endif /* CONFIG_PM_SLEEP */
 440
 441 static int ci_hdrc_imx_runtime_suspend(struct device *dev)
 442 {
 443         struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
 444         int ret;
 445
 446         if (data->in_lpm) {
 447                 WARN_ON(1);
 448                 return 0;
 449         }
 450
 451         ret = imx_usbmisc_set_wakeup(data->usbmisc_data, true);
 452         if (ret) {
 453                 dev_err(dev, "usbmisc set_wakeup failed, ret=%d\n", ret);
 454                 return ret;
 455         }
 456
 457         return imx_controller_suspend(dev);
 458 }
 459
 460 static int ci_hdrc_imx_runtime_resume(struct device *dev)
 461 {
 462         return imx_controller_resume(dev);
 463 }
 464
 465 #endif /* CONFIG_PM */
 466
 467 static const struct dev_pm_ops ci_hdrc_imx_pm_ops = {
 468         SET_SYSTEM_SLEEP_PM_OPS(ci_hdrc_imx_suspend, ci_hdrc_imx_resume)
 469         SET_RUNTIME_PM_OPS(ci_hdrc_imx_runtime_suspend,
 470                         ci_hdrc_imx_runtime_resume, NULL)
 471 };
 472 static struct platform_driver ci_hdrc_imx_driver = {
 473         .probe = ci_hdrc_imx_probe,
 474         .remove = ci_hdrc_imx_remove,
 475         .shutdown = ci_hdrc_imx_shutdown,
 476         .driver = {
 477                 .name = "imx_usb",
 478                 .of_match_table = ci_hdrc_imx_dt_ids,
 479                 .pm = &ci_hdrc_imx_pm_ops,
 480          },
 481 };
 482
 483 module_platform_driver(ci_hdrc_imx_driver);
 484
 485 MODULE_ALIAS("platform:imx-usb");
 486 MODULE_LICENSE("GPL v2");
 487 MODULE_DESCRIPTION("CI HDRC i.MX USB binding");
 488 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 489 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");