drivers/usb/dwc3/dwc3-imx8mp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * dwc3-imx8mp.c - NXP imx8mp Specific Glue layer
   4  *
   5  * Copyright (c) 2020 NXP.
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/io.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/of_platform.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17
  18 #include "core.h"
  19
  20 /* USB wakeup registers */
  21 #define USB_WAKEUP_CTRL                 0x00
  22
  23 /* Global wakeup interrupt enable, also used to clear interrupt */
  24 #define USB_WAKEUP_EN                   BIT(31)
  25 /* Wakeup from connect or disconnect, only for superspeed */
  26 #define USB_WAKEUP_SS_CONN              BIT(5)
  27 /* 0 select vbus_valid, 1 select sessvld */
  28 #define USB_WAKEUP_VBUS_SRC_SESS_VAL    BIT(4)
  29 /* Enable signal for wake up from u3 state */
  30 #define USB_WAKEUP_U3_EN                BIT(3)
  31 /* Enable signal for wake up from id change */
  32 #define USB_WAKEUP_ID_EN                BIT(2)
  33 /* Enable signal for wake up from vbus change */
  34 #define USB_WAKEUP_VBUS_EN              BIT(1)
  35 /* Enable signal for wake up from dp/dm change */
  36 #define USB_WAKEUP_DPDM_EN              BIT(0)
  37
  38 #define USB_WAKEUP_EN_MASK              GENMASK(5, 0)
  39
  40 /* USB glue registers */
  41 #define USB_CTRL0               0x00
  42 #define USB_CTRL1               0x04
  43
  44 #define USB_CTRL0_PORTPWR_EN    BIT(12) /* 1 - PPC enabled (default) */
  45 #define USB_CTRL0_USB3_FIXED    BIT(22) /* 1 - USB3 permanent attached */
  46 #define USB_CTRL0_USB2_FIXED    BIT(23) /* 1 - USB2 permanent attached */
  47
  48 #define USB_CTRL1_OC_POLARITY   BIT(16) /* 0 - HIGH / 1 - LOW */
  49 #define USB_CTRL1_PWR_POLARITY  BIT(17) /* 0 - HIGH / 1 - LOW */
  50
  51 struct dwc3_imx8mp {
  52         struct device                   *dev;
  53         struct platform_device          *dwc3;
  54         void __iomem                    *hsio_blk_base;
  55         void __iomem                    *glue_base;
  56         struct clk                      *hsio_clk;
  57         struct clk                      *suspend_clk;
  58         int                             irq;
  59         bool                            pm_suspended;
  60         bool                            wakeup_pending;
  61 };
  62
  63 static void imx8mp_configure_glue(struct dwc3_imx8mp *dwc3_imx)
  64 {
  65         struct device *dev = dwc3_imx->dev;
  66         u32 value;
  67
  68         if (!dwc3_imx->glue_base)
  69                 return;
  70
  71         value = readl(dwc3_imx->glue_base + USB_CTRL0);
  72
  73         if (device_property_read_bool(dev, "fsl,permanently-attached"))
  74                 value |= (USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);
  75         else
  76                 value &= ~(USB_CTRL0_USB2_FIXED | USB_CTRL0_USB3_FIXED);
  77
  78         if (device_property_read_bool(dev, "fsl,disable-port-power-control"))
  79                 value &= ~(USB_CTRL0_PORTPWR_EN);
  80         else
  81                 value |= USB_CTRL0_PORTPWR_EN;
  82
  83         writel(value, dwc3_imx->glue_base + USB_CTRL0);
  84
  85         value = readl(dwc3_imx->glue_base + USB_CTRL1);
  86         if (device_property_read_bool(dev, "fsl,over-current-active-low"))
  87                 value |= USB_CTRL1_OC_POLARITY;
  88         else
  89                 value &= ~USB_CTRL1_OC_POLARITY;
  90
  91         if (device_property_read_bool(dev, "fsl,power-active-low"))
  92                 value |= USB_CTRL1_PWR_POLARITY;
  93         else
  94                 value &= ~USB_CTRL1_PWR_POLARITY;
  95
  96         writel(value, dwc3_imx->glue_base + USB_CTRL1);
  97 }
  98
  99 static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx)
 100 {
 101         struct dwc3     *dwc3 = platform_get_drvdata(dwc3_imx->dwc3);
 102         u32             val;
 103
 104         if (!dwc3)
 105                 return;
 106
 107         val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
 108
 109         if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci)
 110                 val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN |
 111                        USB_WAKEUP_U3_EN | USB_WAKEUP_DPDM_EN;
 112         else if (dwc3->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
 113                 val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN |
 114                        USB_WAKEUP_VBUS_SRC_SESS_VAL;
 115
 116         writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
 117 }
 118
 119 static void dwc3_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc3_imx)
 120 {
 121         u32 val;
 122
 123         val = readl(dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
 124         val &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK);
 125         writel(val, dwc3_imx->hsio_blk_base + USB_WAKEUP_CTRL);
 126 }
 127
 128 static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx)
 129 {
 130         struct dwc3_imx8mp      *dwc3_imx = _dwc3_imx;
 131         struct dwc3             *dwc = platform_get_drvdata(dwc3_imx->dwc3);
 132
 133         if (!dwc3_imx->pm_suspended)
 134                 return IRQ_HANDLED;
 135
 136         disable_irq_nosync(dwc3_imx->irq);
 137         dwc3_imx->wakeup_pending = true;
 138
 139         if ((dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc->xhci)
 140                 pm_runtime_resume(&dwc->xhci->dev);
 141         else if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE)
 142                 pm_runtime_get(dwc->dev);
 143
 144         return IRQ_HANDLED;
 145 }
 146
 147 static int dwc3_imx8mp_probe(struct platform_device *pdev)
 148 {
 149         struct device           *dev = &pdev->dev;
 150         struct device_node      *dwc3_np, *node = dev->of_node;
 151         struct dwc3_imx8mp      *dwc3_imx;
 152         struct resource         *res;
 153         int                     err, irq;
 154
 155         if (!node) {
 156                 dev_err(dev, "device node not found\n");
 157                 return -EINVAL;
 158         }
 159
 160         dwc3_imx = devm_kzalloc(dev, sizeof(*dwc3_imx), GFP_KERNEL);
 161         if (!dwc3_imx)
 162                 return -ENOMEM;
 163
 164         platform_set_drvdata(pdev, dwc3_imx);
 165
 166         dwc3_imx->dev = dev;
 167
 168         dwc3_imx->hsio_blk_base = devm_platform_ioremap_resource(pdev, 0);
 169         if (IS_ERR(dwc3_imx->hsio_blk_base))
 170                 return PTR_ERR(dwc3_imx->hsio_blk_base);
 171
 172         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 173         if (!res) {
 174                 dev_warn(dev, "Base address for glue layer missing. Continuing without, some features are missing though.");
 175         } else {
 176                 dwc3_imx->glue_base = devm_ioremap_resource(dev, res);
 177                 if (IS_ERR(dwc3_imx->glue_base))
 178                         return PTR_ERR(dwc3_imx->glue_base);
 179         }
 180
 181         dwc3_imx->hsio_clk = devm_clk_get(dev, "hsio");
 182         if (IS_ERR(dwc3_imx->hsio_clk)) {
 183                 err = PTR_ERR(dwc3_imx->hsio_clk);
 184                 dev_err(dev, "Failed to get hsio clk, err=%d\n", err);
 185                 return err;
 186         }
 187
 188         err = clk_prepare_enable(dwc3_imx->hsio_clk);
 189         if (err) {
 190                 dev_err(dev, "Failed to enable hsio clk, err=%d\n", err);
 191                 return err;
 192         }
 193
 194         dwc3_imx->suspend_clk = devm_clk_get(dev, "suspend");
 195         if (IS_ERR(dwc3_imx->suspend_clk)) {
 196                 err = PTR_ERR(dwc3_imx->suspend_clk);
 197                 dev_err(dev, "Failed to get suspend clk, err=%d\n", err);
 198                 goto disable_hsio_clk;
 199         }
 200
 201         err = clk_prepare_enable(dwc3_imx->suspend_clk);
 202         if (err) {
 203                 dev_err(dev, "Failed to enable suspend clk, err=%d\n", err);
 204                 goto disable_hsio_clk;
 205         }
 206
 207         irq = platform_get_irq(pdev, 0);
 208         if (irq < 0) {
 209                 err = irq;
 210                 goto disable_clks;
 211         }
 212         dwc3_imx->irq = irq;
 213
 214         imx8mp_configure_glue(dwc3_imx);
 215
 216         pm_runtime_set_active(dev);
 217         pm_runtime_enable(dev);
 218         err = pm_runtime_get_sync(dev);
 219         if (err < 0)
 220                 goto disable_rpm;
 221
 222         dwc3_np = of_get_compatible_child(node, "snps,dwc3");
 223         if (!dwc3_np) {
 224                 err = -ENODEV;
 225                 dev_err(dev, "failed to find dwc3 core child\n");
 226                 goto disable_rpm;
 227         }
 228
 229         err = of_platform_populate(node, NULL, NULL, dev);
 230         if (err) {
 231                 dev_err(&pdev->dev, "failed to create dwc3 core\n");
 232                 goto err_node_put;
 233         }
 234
 235         dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np);
 236         if (!dwc3_imx->dwc3) {
 237                 dev_err(dev, "failed to get dwc3 platform device\n");
 238                 err = -ENODEV;
 239                 goto depopulate;
 240         }
 241         of_node_put(dwc3_np);
 242
 243         err = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt,
 244                                         IRQF_ONESHOT, dev_name(dev), dwc3_imx);
 245         if (err) {
 246                 dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, err);
 247                 goto depopulate;
 248         }
 249
 250         device_set_wakeup_capable(dev, true);
 251         pm_runtime_put(dev);
 252
 253         return 0;
 254
 255 depopulate:
 256         of_platform_depopulate(dev);
 257 err_node_put:
 258         of_node_put(dwc3_np);
 259 disable_rpm:
 260         pm_runtime_disable(dev);
 261         pm_runtime_put_noidle(dev);
 262 disable_clks:
 263         clk_disable_unprepare(dwc3_imx->suspend_clk);
 264 disable_hsio_clk:
 265         clk_disable_unprepare(dwc3_imx->hsio_clk);
 266
 267         return err;
 268 }
 269
 270 static void dwc3_imx8mp_remove(struct platform_device *pdev)
 271 {
 272         struct dwc3_imx8mp *dwc3_imx = platform_get_drvdata(pdev);
 273         struct device *dev = &pdev->dev;
 274
 275         pm_runtime_get_sync(dev);
 276         of_platform_depopulate(dev);
 277
 278         clk_disable_unprepare(dwc3_imx->suspend_clk);
 279         clk_disable_unprepare(dwc3_imx->hsio_clk);
 280
 281         pm_runtime_disable(dev);
 282         pm_runtime_put_noidle(dev);
 283 }
 284
 285 static int __maybe_unused dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx,
 286                                               pm_message_t msg)
 287 {
 288         if (dwc3_imx->pm_suspended)
 289                 return 0;
 290
 291         /* Wakeup enable */
 292         if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev))
 293                 dwc3_imx8mp_wakeup_enable(dwc3_imx);
 294
 295         dwc3_imx->pm_suspended = true;
 296
 297         return 0;
 298 }
 299
 300 static int __maybe_unused dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx,
 301                                              pm_message_t msg)
 302 {
 303         struct dwc3     *dwc = platform_get_drvdata(dwc3_imx->dwc3);
 304         int ret = 0;
 305
 306         if (!dwc3_imx->pm_suspended)
 307                 return 0;
 308
 309         /* Wakeup disable */
 310         dwc3_imx8mp_wakeup_disable(dwc3_imx);
 311         dwc3_imx->pm_suspended = false;
 312
 313         /* Upon power loss any previous configuration is lost, restore it */
 314         imx8mp_configure_glue(dwc3_imx);
 315
 316         if (dwc3_imx->wakeup_pending) {
 317                 dwc3_imx->wakeup_pending = false;
 318                 if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) {
 319                         pm_runtime_mark_last_busy(dwc->dev);
 320                         pm_runtime_put_autosuspend(dwc->dev);
 321                 } else {
 322                         /*
 323                          * Add wait for xhci switch from suspend
 324                          * clock to normal clock to detect connection.
 325                          */
 326                         usleep_range(9000, 10000);
 327                 }
 328                 enable_irq(dwc3_imx->irq);
 329         }
 330
 331         return ret;
 332 }
 333
 334 static int __maybe_unused dwc3_imx8mp_pm_suspend(struct device *dev)
 335 {
 336         struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
 337         int ret;
 338
 339         ret = dwc3_imx8mp_suspend(dwc3_imx, PMSG_SUSPEND);
 340
 341         if (device_may_wakeup(dwc3_imx->dev))
 342                 enable_irq_wake(dwc3_imx->irq);
 343         else
 344                 clk_disable_unprepare(dwc3_imx->suspend_clk);
 345
 346         clk_disable_unprepare(dwc3_imx->hsio_clk);
 347         dev_dbg(dev, "dwc3 imx8mp pm suspend.\n");
 348
 349         return ret;
 350 }
 351
 352 static int __maybe_unused dwc3_imx8mp_pm_resume(struct device *dev)
 353 {
 354         struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
 355         int ret;
 356
 357         if (device_may_wakeup(dwc3_imx->dev)) {
 358                 disable_irq_wake(dwc3_imx->irq);
 359         } else {
 360                 ret = clk_prepare_enable(dwc3_imx->suspend_clk);
 361                 if (ret)
 362                         return ret;
 363         }
 364
 365         ret = clk_prepare_enable(dwc3_imx->hsio_clk);
 366         if (ret)
 367                 return ret;
 368
 369         ret = dwc3_imx8mp_resume(dwc3_imx, PMSG_RESUME);
 370
 371         pm_runtime_disable(dev);
 372         pm_runtime_set_active(dev);
 373         pm_runtime_enable(dev);
 374
 375         dev_dbg(dev, "dwc3 imx8mp pm resume.\n");
 376
 377         return ret;
 378 }
 379
 380 static int __maybe_unused dwc3_imx8mp_runtime_suspend(struct device *dev)
 381 {
 382         struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
 383
 384         dev_dbg(dev, "dwc3 imx8mp runtime suspend.\n");
 385
 386         return dwc3_imx8mp_suspend(dwc3_imx, PMSG_AUTO_SUSPEND);
 387 }
 388
 389 static int __maybe_unused dwc3_imx8mp_runtime_resume(struct device *dev)
 390 {
 391         struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev);
 392
 393         dev_dbg(dev, "dwc3 imx8mp runtime resume.\n");
 394
 395         return dwc3_imx8mp_resume(dwc3_imx, PMSG_AUTO_RESUME);
 396 }
 397
 398 static const struct dev_pm_ops dwc3_imx8mp_dev_pm_ops = {
 399         SET_SYSTEM_SLEEP_PM_OPS(dwc3_imx8mp_pm_suspend, dwc3_imx8mp_pm_resume)
 400         SET_RUNTIME_PM_OPS(dwc3_imx8mp_runtime_suspend,
 401                            dwc3_imx8mp_runtime_resume, NULL)
 402 };
 403
 404 static const struct of_device_id dwc3_imx8mp_of_match[] = {
 405         { .compatible = "fsl,imx8mp-dwc3", },
 406         {},
 407 };
 408 MODULE_DEVICE_TABLE(of, dwc3_imx8mp_of_match);
 409
 410 static struct platform_driver dwc3_imx8mp_driver = {
 411         .probe          = dwc3_imx8mp_probe,
 412         .remove_new     = dwc3_imx8mp_remove,
 413         .driver         = {
 414                 .name   = "imx8mp-dwc3",
 415                 .pm     = &dwc3_imx8mp_dev_pm_ops,
 416                 .of_match_table = dwc3_imx8mp_of_match,
 417         },
 418 };
 419
 420 module_platform_driver(dwc3_imx8mp_driver);
 421
 422 MODULE_ALIAS("platform:imx8mp-dwc3");
 423 MODULE_AUTHOR("[email protected]");
 424 MODULE_LICENSE("GPL v2");
 425 MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer");