drivers/usb/gadget/dwc2_udc_otg.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * drivers/usb/gadget/dwc2_udc_otg.c
   4  * Designware DWC2 on-chip full/high speed USB OTG 2.0 device controllers
   5  *
   6  * Copyright (C) 2008 for Samsung Electronics
   7  *
   8  * BSP Support for Samsung's UDC driver
   9  * available at:
  10  * git://git.kernel.org/pub/scm/linux/kernel/git/kki_ap/linux-2.6-samsung.git
  11  *
  12  * State machine bugfixes:
  13  * Marek Szyprowski <m.szyprowski@samsung.com>
  14  *
  15  * Ported to u-boot:
  16  * Marek Szyprowski <m.szyprowski@samsung.com>
  17  * Lukasz Majewski <l.majewski@samsumg.com>
  18  */
  19 #undef DEBUG
  20 #include <common.h>
  21 #include <clk.h>
  22 #include <dm.h>
  23 #include <generic-phy.h>
  24 #include <malloc.h>
  25 #include <reset.h>
  26 #include <dm/device_compat.h>
  27 #include <dm/devres.h>
  28
  29 #include <linux/errno.h>
  30 #include <linux/list.h>
  31
  32 #include <linux/usb/ch9.h>
  33 #include <linux/usb/otg.h>
  34 #include <linux/usb/gadget.h>
  35
  36 #include <phys2bus.h>
  37 #include <asm/byteorder.h>
  38 #include <asm/unaligned.h>
  39 #include <asm/io.h>
  40
  41 #include <asm/mach-types.h>
  42
  43 #include <power/regulator.h>
  44
  45 #include "dwc2_udc_otg_regs.h"
  46 #include "dwc2_udc_otg_priv.h"
  47
  48 /***********************************************************/
  49
  50 #define OTG_DMA_MODE            1
  51
  52 #define DEBUG_SETUP 0
  53 #define DEBUG_EP0 0
  54 #define DEBUG_ISR 0
  55 #define DEBUG_OUT_EP 0
  56 #define DEBUG_IN_EP 0
  57
  58 #include <usb/dwc2_udc.h>
  59
  60 #define EP0_CON         0
  61 #define EP_MASK         0xF
  62
  63 static char *state_names[] = {
  64         "WAIT_FOR_SETUP",
  65         "DATA_STATE_XMIT",
  66         "DATA_STATE_NEED_ZLP",
  67         "WAIT_FOR_OUT_STATUS",
  68         "DATA_STATE_RECV",
  69         "WAIT_FOR_COMPLETE",
  70         "WAIT_FOR_OUT_COMPLETE",
  71         "WAIT_FOR_IN_COMPLETE",
  72         "WAIT_FOR_NULL_COMPLETE",
  73 };
  74
  75 #define DRIVER_VERSION "15 March 2009"
  76
  77 struct dwc2_udc *the_controller;
  78
  79 static const char driver_name[] = "dwc2-udc";
  80 static const char ep0name[] = "ep0-control";
  81
  82 /* Max packet size*/
  83 static unsigned int ep0_fifo_size = 64;
  84 static unsigned int ep_fifo_size =  512;
  85 static unsigned int ep_fifo_size2 = 1024;
  86 static int reset_available = 1;
  87
  88 static struct usb_ctrlrequest *usb_ctrl;
  89 static dma_addr_t usb_ctrl_dma_addr;
  90
  91 /*
  92   Local declarations.
  93 */
  94 static int dwc2_ep_enable(struct usb_ep *ep,
  95                          const struct usb_endpoint_descriptor *);
  96 static int dwc2_ep_disable(struct usb_ep *ep);
  97 static struct usb_request *dwc2_alloc_request(struct usb_ep *ep,
  98                                              gfp_t gfp_flags);
  99 static void dwc2_free_request(struct usb_ep *ep, struct usb_request *);
 100
 101 static int dwc2_queue(struct usb_ep *ep, struct usb_request *, gfp_t gfp_flags);
 102 static int dwc2_dequeue(struct usb_ep *ep, struct usb_request *);
 103 static int dwc2_fifo_status(struct usb_ep *ep);
 104 static void dwc2_fifo_flush(struct usb_ep *ep);
 105 static void dwc2_ep0_read(struct dwc2_udc *dev);
 106 static void dwc2_ep0_kick(struct dwc2_udc *dev, struct dwc2_ep *ep);
 107 static void dwc2_handle_ep0(struct dwc2_udc *dev);
 108 static int dwc2_ep0_write(struct dwc2_udc *dev);
 109 static int write_fifo_ep0(struct dwc2_ep *ep, struct dwc2_request *req);
 110 static void done(struct dwc2_ep *ep, struct dwc2_request *req, int status);
 111 static void stop_activity(struct dwc2_udc *dev,
 112                           struct usb_gadget_driver *driver);
 113 static int udc_enable(struct dwc2_udc *dev);
 114 static void udc_set_address(struct dwc2_udc *dev, unsigned char address);
 115 static void reconfig_usbd(struct dwc2_udc *dev);
 116 static void set_max_pktsize(struct dwc2_udc *dev, enum usb_device_speed speed);
 117 static void nuke(struct dwc2_ep *ep, int status);
 118 static int dwc2_udc_set_halt(struct usb_ep *_ep, int value);
 119 static void dwc2_udc_set_nak(struct dwc2_ep *ep);
 120
 121 void set_udc_gadget_private_data(void *p)
 122 {
 123         debug_cond(DEBUG_SETUP != 0,
 124                    "%s: the_controller: 0x%p, p: 0x%p\n", __func__,
 125                    the_controller, p);
 126         the_controller->gadget.dev.device_data = p;
 127 }
 128
 129 void *get_udc_gadget_private_data(struct usb_gadget *gadget)
 130 {
 131         return gadget->dev.device_data;
 132 }
 133
 134 static struct usb_ep_ops dwc2_ep_ops = {
 135         .enable = dwc2_ep_enable,
 136         .disable = dwc2_ep_disable,
 137
 138         .alloc_request = dwc2_alloc_request,
 139         .free_request = dwc2_free_request,
 140
 141         .queue = dwc2_queue,
 142         .dequeue = dwc2_dequeue,
 143
 144         .set_halt = dwc2_udc_set_halt,
 145         .fifo_status = dwc2_fifo_status,
 146         .fifo_flush = dwc2_fifo_flush,
 147 };
 148
 149 #define create_proc_files() do {} while (0)
 150 #define remove_proc_files() do {} while (0)
 151
 152 /***********************************************************/
 153
 154 struct dwc2_usbotg_reg *reg;
 155
 156 bool dfu_usb_get_reset(void)
 157 {
 158         return !!(readl(&reg->gintsts) & INT_RESET);
 159 }
 160
 161 __weak void otg_phy_init(struct dwc2_udc *dev) {}
 162 __weak void otg_phy_off(struct dwc2_udc *dev) {}
 163
 164 /***********************************************************/
 165
 166 #include "dwc2_udc_otg_xfer_dma.c"
 167
 168 /*
 169  *      udc_disable - disable USB device controller
 170  */
 171 static void udc_disable(struct dwc2_udc *dev)
 172 {
 173         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 174
 175         udc_set_address(dev, 0);
 176
 177         dev->ep0state = WAIT_FOR_SETUP;
 178         dev->gadget.speed = USB_SPEED_UNKNOWN;
 179         dev->usb_address = 0;
 180
 181         otg_phy_off(dev);
 182 }
 183
 184 /*
 185  *      udc_reinit - initialize software state
 186  */
 187 static void udc_reinit(struct dwc2_udc *dev)
 188 {
 189         unsigned int i;
 190
 191         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 192
 193         /* device/ep0 records init */
 194         INIT_LIST_HEAD(&dev->gadget.ep_list);
 195         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
 196         dev->ep0state = WAIT_FOR_SETUP;
 197
 198         /* basic endpoint records init */
 199         for (i = 0; i < DWC2_MAX_ENDPOINTS; i++) {
 200                 struct dwc2_ep *ep = &dev->ep[i];
 201
 202                 if (i != 0)
 203                         list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
 204
 205                 ep->desc = 0;
 206                 ep->stopped = 0;
 207                 INIT_LIST_HEAD(&ep->queue);
 208                 ep->pio_irqs = 0;
 209         }
 210
 211         /* the rest was statically initialized, and is read-only */
 212 }
 213
 214 #define BYTES2MAXP(x)   (x / 8)
 215 #define MAXP2BYTES(x)   (x * 8)
 216
 217 /* until it's enabled, this UDC should be completely invisible
 218  * to any USB host.
 219  */
 220 static int udc_enable(struct dwc2_udc *dev)
 221 {
 222         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 223
 224         otg_phy_init(dev);
 225         reconfig_usbd(dev);
 226
 227         debug_cond(DEBUG_SETUP != 0,
 228                    "DWC2 USB 2.0 OTG Controller Core Initialized : 0x%x\n",
 229                     readl(&reg->gintmsk));
 230
 231         dev->gadget.speed = USB_SPEED_UNKNOWN;
 232
 233         return 0;
 234 }
 235
 236 #if !CONFIG_IS_ENABLED(DM_USB_GADGET)
 237 /*
 238   Register entry point for the peripheral controller driver.
 239 */
 240 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 241 {
 242         struct dwc2_udc *dev = the_controller;
 243         int retval = 0;
 244         unsigned long flags = 0;
 245
 246         debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");
 247
 248         if (!driver
 249             || (driver->speed != USB_SPEED_FULL
 250                 && driver->speed != USB_SPEED_HIGH)
 251             || !driver->bind || !driver->disconnect || !driver->setup)
 252                 return -EINVAL;
 253         if (!dev)
 254                 return -ENODEV;
 255         if (dev->driver)
 256                 return -EBUSY;
 257
 258         spin_lock_irqsave(&dev->lock, flags);
 259         /* first hook up the driver ... */
 260         dev->driver = driver;
 261         spin_unlock_irqrestore(&dev->lock, flags);
 262
 263         if (retval) { /* TODO */
 264                 printf("target device_add failed, error %d\n", retval);
 265                 return retval;
 266         }
 267
 268         retval = driver->bind(&dev->gadget);
 269         if (retval) {
 270                 debug_cond(DEBUG_SETUP != 0,
 271                            "%s: bind to driver --> error %d\n",
 272                             dev->gadget.name, retval);
 273                 dev->driver = 0;
 274                 return retval;
 275         }
 276
 277         enable_irq(IRQ_OTG);
 278
 279         debug_cond(DEBUG_SETUP != 0,
 280                    "Registered gadget driver %s\n", dev->gadget.name);
 281         udc_enable(dev);
 282
 283         return 0;
 284 }
 285
 286 /*
 287  * Unregister entry point for the peripheral controller driver.
 288  */
 289 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 290 {
 291         struct dwc2_udc *dev = the_controller;
 292         unsigned long flags = 0;
 293
 294         if (!dev)
 295                 return -ENODEV;
 296         if (!driver || driver != dev->driver)
 297                 return -EINVAL;
 298
 299         spin_lock_irqsave(&dev->lock, flags);
 300         dev->driver = 0;
 301         stop_activity(dev, driver);
 302         spin_unlock_irqrestore(&dev->lock, flags);
 303
 304         driver->unbind(&dev->gadget);
 305
 306         disable_irq(IRQ_OTG);
 307
 308         udc_disable(dev);
 309         return 0;
 310 }
 311 #else /* !CONFIG_IS_ENABLED(DM_USB_GADGET) */
 312
 313 static int dwc2_gadget_start(struct usb_gadget *g,
 314                              struct usb_gadget_driver *driver)
 315 {
 316         struct dwc2_udc *dev = the_controller;
 317
 318         debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");
 319
 320         if (!driver ||
 321             (driver->speed != USB_SPEED_FULL &&
 322              driver->speed != USB_SPEED_HIGH) ||
 323             !driver->bind || !driver->disconnect || !driver->setup)
 324                 return -EINVAL;
 325
 326         if (!dev)
 327                 return -ENODEV;
 328
 329         if (dev->driver)
 330                 return -EBUSY;
 331
 332         /* first hook up the driver ... */
 333         dev->driver = driver;
 334
 335         debug_cond(DEBUG_SETUP != 0,
 336                    "Registered gadget driver %s\n", dev->gadget.name);
 337         return udc_enable(dev);
 338 }
 339
 340 static int dwc2_gadget_stop(struct usb_gadget *g)
 341 {
 342         struct dwc2_udc *dev = the_controller;
 343
 344         if (!dev)
 345                 return -ENODEV;
 346
 347         if (!dev->driver)
 348                 return -EINVAL;
 349
 350         dev->driver = 0;
 351         stop_activity(dev, dev->driver);
 352
 353         udc_disable(dev);
 354
 355         return 0;
 356 }
 357
 358 #endif /* !CONFIG_IS_ENABLED(DM_USB_GADGET) */
 359
 360 /*
 361  *      done - retire a request; caller blocked irqs
 362  */
 363 static void done(struct dwc2_ep *ep, struct dwc2_request *req, int status)
 364 {
 365         unsigned int stopped = ep->stopped;
 366
 367         debug("%s: %s %p, req = %p, stopped = %d\n",
 368               __func__, ep->ep.name, ep, &req->req, stopped);
 369
 370         list_del_init(&req->queue);
 371
 372         if (likely(req->req.status == -EINPROGRESS))
 373                 req->req.status = status;
 374         else
 375                 status = req->req.status;
 376
 377         if (status && status != -ESHUTDOWN) {
 378                 debug("complete %s req %p stat %d len %u/%u\n",
 379                       ep->ep.name, &req->req, status,
 380                       req->req.actual, req->req.length);
 381         }
 382
 383         /* don't modify queue heads during completion callback */
 384         ep->stopped = 1;
 385
 386 #ifdef DEBUG
 387         printf("calling complete callback\n");
 388         {
 389                 int i, len = req->req.length;
 390
 391                 printf("pkt[%d] = ", req->req.length);
 392                 if (len > 64)
 393                         len = 64;
 394                 for (i = 0; i < len; i++) {
 395                         printf("%02x", ((u8 *)req->req.buf)[i]);
 396                         if ((i & 7) == 7)
 397                                 printf(" ");
 398                 }
 399                 printf("\n");
 400         }
 401 #endif
 402         spin_unlock(&ep->dev->lock);
 403         req->req.complete(&ep->ep, &req->req);
 404         spin_lock(&ep->dev->lock);
 405
 406         debug("callback completed\n");
 407
 408         ep->stopped = stopped;
 409 }
 410
 411 /*
 412  *      nuke - dequeue ALL requests
 413  */
 414 static void nuke(struct dwc2_ep *ep, int status)
 415 {
 416         struct dwc2_request *req;
 417
 418         debug("%s: %s %p\n", __func__, ep->ep.name, ep);
 419
 420         /* called with irqs blocked */
 421         while (!list_empty(&ep->queue)) {
 422                 req = list_entry(ep->queue.next, struct dwc2_request, queue);
 423                 done(ep, req, status);
 424         }
 425 }
 426
 427 static void stop_activity(struct dwc2_udc *dev,
 428                           struct usb_gadget_driver *driver)
 429 {
 430         int i;
 431
 432         /* don't disconnect drivers more than once */
 433         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
 434                 driver = 0;
 435         dev->gadget.speed = USB_SPEED_UNKNOWN;
 436
 437         /* prevent new request submissions, kill any outstanding requests  */
 438         for (i = 0; i < DWC2_MAX_ENDPOINTS; i++) {
 439                 struct dwc2_ep *ep = &dev->ep[i];
 440                 ep->stopped = 1;
 441                 nuke(ep, -ESHUTDOWN);
 442         }
 443
 444         /* report disconnect; the driver is already quiesced */
 445         if (driver) {
 446                 spin_unlock(&dev->lock);
 447                 driver->disconnect(&dev->gadget);
 448                 spin_lock(&dev->lock);
 449         }
 450
 451         /* re-init driver-visible data structures */
 452         udc_reinit(dev);
 453 }
 454
 455 static void reconfig_usbd(struct dwc2_udc *dev)
 456 {
 457         /* 2. Soft-reset OTG Core and then unreset again. */
 458         int i;
 459         unsigned int uTemp = writel(CORE_SOFT_RESET, &reg->grstctl);
 460         uint32_t dflt_gusbcfg;
 461         uint32_t rx_fifo_sz, tx_fifo_sz, np_tx_fifo_sz;
 462         u32 max_hw_ep;
 463         int pdata_hw_ep;
 464
 465         debug("Reseting OTG controller\n");
 466
 467         dflt_gusbcfg =
 468                 0<<15           /* PHY Low Power Clock sel*/
 469                 |1<<14          /* Non-Periodic TxFIFO Rewind Enable*/
 470                 |0x5<<10        /* Turnaround time*/
 471                 |0<<9 | 0<<8    /* [0:HNP disable,1:HNP enable][ 0:SRP disable*/
 472                                 /* 1:SRP enable] H1= 1,1*/
 473                 |0<<7           /* Ulpi DDR sel*/
 474                 |0<<6           /* 0: high speed utmi+, 1: full speed serial*/
 475                 |0<<4           /* 0: utmi+, 1:ulpi*/
 476 #ifdef CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8
 477                 |0<<3           /* phy i/f  0:8bit, 1:16bit*/
 478 #else
 479                 |1<<3           /* phy i/f  0:8bit, 1:16bit*/
 480 #endif
 481                 |0x7<<0;        /* HS/FS Timeout**/
 482
 483         if (dev->pdata->usb_gusbcfg)
 484                 dflt_gusbcfg = dev->pdata->usb_gusbcfg;
 485
 486         writel(dflt_gusbcfg, &reg->gusbcfg);
 487
 488         /* 3. Put the OTG device core in the disconnected state.*/
 489         uTemp = readl(&reg->dctl);
 490         uTemp |= SOFT_DISCONNECT;
 491         writel(uTemp, &reg->dctl);
 492
 493         udelay(20);
 494
 495         /* 4. Make the OTG device core exit from the disconnected state.*/
 496         uTemp = readl(&reg->dctl);
 497         uTemp = uTemp & ~SOFT_DISCONNECT;
 498         writel(uTemp, &reg->dctl);
 499
 500         /* 5. Configure OTG Core to initial settings of device mode.*/
 501         /* [][1: full speed(30Mhz) 0:high speed]*/
 502         writel(EP_MISS_CNT(1) | DEV_SPEED_HIGH_SPEED_20, &reg->dcfg);
 503
 504         mdelay(1);
 505
 506         /* 6. Unmask the core interrupts*/
 507         writel(GINTMSK_INIT, &reg->gintmsk);
 508
 509         /* 7. Set NAK bit of EP0, EP1, EP2*/
 510         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[EP0_CON].doepctl);
 511         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[EP0_CON].diepctl);
 512
 513         for (i = 1; i < DWC2_MAX_ENDPOINTS; i++) {
 514                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[i].doepctl);
 515                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[i].diepctl);
 516         }
 517
 518         /* 8. Unmask EPO interrupts*/
 519         writel(((1 << EP0_CON) << DAINT_OUT_BIT)
 520                | (1 << EP0_CON), &reg->daintmsk);
 521
 522         /* 9. Unmask device OUT EP common interrupts*/
 523         writel(DOEPMSK_INIT, &reg->doepmsk);
 524
 525         /* 10. Unmask device IN EP common interrupts*/
 526         writel(DIEPMSK_INIT, &reg->diepmsk);
 527
 528         rx_fifo_sz = RX_FIFO_SIZE;
 529         np_tx_fifo_sz = NPTX_FIFO_SIZE;
 530         tx_fifo_sz = PTX_FIFO_SIZE;
 531
 532         if (dev->pdata->rx_fifo_sz)
 533                 rx_fifo_sz = dev->pdata->rx_fifo_sz;
 534         if (dev->pdata->np_tx_fifo_sz)
 535                 np_tx_fifo_sz = dev->pdata->np_tx_fifo_sz;
 536         if (dev->pdata->tx_fifo_sz)
 537                 tx_fifo_sz = dev->pdata->tx_fifo_sz;
 538
 539         /* 11. Set Rx FIFO Size (in 32-bit words) */
 540         writel(rx_fifo_sz, &reg->grxfsiz);
 541
 542         /* 12. Set Non Periodic Tx FIFO Size */
 543         writel((np_tx_fifo_sz << 16) | rx_fifo_sz,
 544                &reg->gnptxfsiz);
 545
 546         /* retrieve the number of IN Endpoints (excluding ep0) */
 547         max_hw_ep = (readl(&reg->ghwcfg4) & GHWCFG4_NUM_IN_EPS_MASK) >>
 548                     GHWCFG4_NUM_IN_EPS_SHIFT;
 549         pdata_hw_ep = dev->pdata->tx_fifo_sz_nb;
 550
 551         /* tx_fifo_sz_nb should equal to number of IN Endpoint */
 552         if (pdata_hw_ep && max_hw_ep != pdata_hw_ep)
 553                 pr_warn("Got %d hw endpoint but %d tx-fifo-size in array !!\n",
 554                         max_hw_ep, pdata_hw_ep);
 555
 556         for (i = 0; i < max_hw_ep; i++) {
 557                 if (pdata_hw_ep)
 558                         tx_fifo_sz = dev->pdata->tx_fifo_sz_array[i];
 559
 560                 writel((rx_fifo_sz + np_tx_fifo_sz + (tx_fifo_sz * i)) |
 561                         tx_fifo_sz << 16, &reg->dieptxf[i]);
 562         }
 563         /* Flush the RX FIFO */
 564         writel(RX_FIFO_FLUSH, &reg->grstctl);
 565         while (readl(&reg->grstctl) & RX_FIFO_FLUSH)
 566                 debug("%s: waiting for DWC2_UDC_OTG_GRSTCTL\n", __func__);
 567
 568         /* Flush all the Tx FIFO's */
 569         writel(TX_FIFO_FLUSH_ALL, &reg->grstctl);
 570         writel(TX_FIFO_FLUSH_ALL | TX_FIFO_FLUSH, &reg->grstctl);
 571         while (readl(&reg->grstctl) & TX_FIFO_FLUSH)
 572                 debug("%s: waiting for DWC2_UDC_OTG_GRSTCTL\n", __func__);
 573
 574         /* 13. Clear NAK bit of EP0, EP1, EP2*/
 575         /* For Slave mode*/
 576         /* EP0: Control OUT */
 577         writel(DEPCTL_EPDIS | DEPCTL_CNAK,
 578                &reg->out_endp[EP0_CON].doepctl);
 579
 580         /* 14. Initialize OTG Link Core.*/
 581         writel(GAHBCFG_INIT, &reg->gahbcfg);
 582 }
 583
 584 static void set_max_pktsize(struct dwc2_udc *dev, enum usb_device_speed speed)
 585 {
 586         unsigned int ep_ctrl;
 587         int i;
 588
 589         if (speed == USB_SPEED_HIGH) {
 590                 ep0_fifo_size = 64;
 591                 ep_fifo_size = 512;
 592                 ep_fifo_size2 = 1024;
 593                 dev->gadget.speed = USB_SPEED_HIGH;
 594         } else {
 595                 ep0_fifo_size = 64;
 596                 ep_fifo_size = 64;
 597                 ep_fifo_size2 = 64;
 598                 dev->gadget.speed = USB_SPEED_FULL;
 599         }
 600
 601         dev->ep[0].ep.maxpacket = ep0_fifo_size;
 602         for (i = 1; i < DWC2_MAX_ENDPOINTS; i++)
 603                 dev->ep[i].ep.maxpacket = ep_fifo_size;
 604
 605         /* EP0 - Control IN (64 bytes)*/
 606         ep_ctrl = readl(&reg->in_endp[EP0_CON].diepctl);
 607         writel(ep_ctrl|(0<<0), &reg->in_endp[EP0_CON].diepctl);
 608
 609         /* EP0 - Control OUT (64 bytes)*/
 610         ep_ctrl = readl(&reg->out_endp[EP0_CON].doepctl);
 611         writel(ep_ctrl|(0<<0), &reg->out_endp[EP0_CON].doepctl);
 612 }
 613
 614 static int dwc2_ep_enable(struct usb_ep *_ep,
 615                          const struct usb_endpoint_descriptor *desc)
 616 {
 617         struct dwc2_ep *ep;
 618         struct dwc2_udc *dev;
 619         unsigned long flags = 0;
 620
 621         debug("%s: %p\n", __func__, _ep);
 622
 623         ep = container_of(_ep, struct dwc2_ep, ep);
 624         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 625             || desc->bDescriptorType != USB_DT_ENDPOINT
 626             || ep->bEndpointAddress != desc->bEndpointAddress
 627             || ep_maxpacket(ep) <
 628             le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
 629
 630                 debug("%s: bad ep or descriptor\n", __func__);
 631                 return -EINVAL;
 632         }
 633
 634         /* xfer types must match, except that interrupt ~= bulk */
 635         if (ep->bmAttributes != desc->bmAttributes
 636             && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 637             && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 638
 639                 debug("%s: %s type mismatch\n", __func__, _ep->name);
 640                 return -EINVAL;
 641         }
 642
 643         /* hardware _could_ do smaller, but driver doesn't */
 644         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK &&
 645              le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) >
 646              ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) {
 647
 648                 debug("%s: bad %s maxpacket\n", __func__, _ep->name);
 649                 return -ERANGE;
 650         }
 651
 652         dev = ep->dev;
 653         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 654
 655                 debug("%s: bogus device state\n", __func__);
 656                 return -ESHUTDOWN;
 657         }
 658
 659         ep->stopped = 0;
 660         ep->desc = desc;
 661         ep->pio_irqs = 0;
 662         ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 663
 664         /* Reset halt state */
 665         dwc2_udc_set_nak(ep);
 666         dwc2_udc_set_halt(_ep, 0);
 667
 668         spin_lock_irqsave(&ep->dev->lock, flags);
 669         dwc2_udc_ep_activate(ep);
 670         spin_unlock_irqrestore(&ep->dev->lock, flags);
 671
 672         debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
 673               __func__, _ep->name, ep->stopped, ep->ep.maxpacket);
 674         return 0;
 675 }
 676
 677 /*
 678  * Disable EP
 679  */
 680 static int dwc2_ep_disable(struct usb_ep *_ep)
 681 {
 682         struct dwc2_ep *ep;
 683         unsigned long flags = 0;
 684
 685         debug("%s: %p\n", __func__, _ep);
 686
 687         ep = container_of(_ep, struct dwc2_ep, ep);
 688         if (!_ep || !ep->desc) {
 689                 debug("%s: %s not enabled\n", __func__,
 690                       _ep ? ep->ep.name : NULL);
 691                 return -EINVAL;
 692         }
 693
 694         spin_lock_irqsave(&ep->dev->lock, flags);
 695
 696         /* Nuke all pending requests */
 697         nuke(ep, -ESHUTDOWN);
 698
 699         ep->desc = 0;
 700         ep->stopped = 1;
 701
 702         spin_unlock_irqrestore(&ep->dev->lock, flags);
 703
 704         debug("%s: disabled %s\n", __func__, _ep->name);
 705         return 0;
 706 }
 707
 708 static struct usb_request *dwc2_alloc_request(struct usb_ep *ep,
 709                                              gfp_t gfp_flags)
 710 {
 711         struct dwc2_request *req;
 712
 713         debug("%s: %s %p\n", __func__, ep->name, ep);
 714
 715         req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
 716         if (!req)
 717                 return 0;
 718
 719         memset(req, 0, sizeof *req);
 720         INIT_LIST_HEAD(&req->queue);
 721
 722         return &req->req;
 723 }
 724
 725 static void dwc2_free_request(struct usb_ep *ep, struct usb_request *_req)
 726 {
 727         struct dwc2_request *req;
 728
 729         debug("%s: %p\n", __func__, ep);
 730
 731         req = container_of(_req, struct dwc2_request, req);
 732         WARN_ON(!list_empty(&req->queue));
 733         kfree(req);
 734 }
 735
 736 /* dequeue JUST ONE request */
 737 static int dwc2_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 738 {
 739         struct dwc2_ep *ep;
 740         struct dwc2_request *req;
 741         unsigned long flags = 0;
 742
 743         debug("%s: %p\n", __func__, _ep);
 744
 745         ep = container_of(_ep, struct dwc2_ep, ep);
 746         if (!_ep || ep->ep.name == ep0name)
 747                 return -EINVAL;
 748
 749         spin_lock_irqsave(&ep->dev->lock, flags);
 750
 751         /* make sure it's actually queued on this endpoint */
 752         list_for_each_entry(req, &ep->queue, queue) {
 753                 if (&req->req == _req)
 754                         break;
 755         }
 756         if (&req->req != _req) {
 757                 spin_unlock_irqrestore(&ep->dev->lock, flags);
 758                 return -EINVAL;
 759         }
 760
 761         done(ep, req, -ECONNRESET);
 762
 763         spin_unlock_irqrestore(&ep->dev->lock, flags);
 764         return 0;
 765 }
 766
 767 /*
 768  * Return bytes in EP FIFO
 769  */
 770 static int dwc2_fifo_status(struct usb_ep *_ep)
 771 {
 772         int count = 0;
 773         struct dwc2_ep *ep;
 774
 775         ep = container_of(_ep, struct dwc2_ep, ep);
 776         if (!_ep) {
 777                 debug("%s: bad ep\n", __func__);
 778                 return -ENODEV;
 779         }
 780
 781         debug("%s: %d\n", __func__, ep_index(ep));
 782
 783         /* LPD can't report unclaimed bytes from IN fifos */
 784         if (ep_is_in(ep))
 785                 return -EOPNOTSUPP;
 786
 787         return count;
 788 }
 789
 790 /*
 791  * Flush EP FIFO
 792  */
 793 static void dwc2_fifo_flush(struct usb_ep *_ep)
 794 {
 795         struct dwc2_ep *ep;
 796
 797         ep = container_of(_ep, struct dwc2_ep, ep);
 798         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 799                 debug("%s: bad ep\n", __func__);
 800                 return;
 801         }
 802
 803         debug("%s: %d\n", __func__, ep_index(ep));
 804 }
 805
 806 static const struct usb_gadget_ops dwc2_udc_ops = {
 807         /* current versions must always be self-powered */
 808 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 809         .udc_start              = dwc2_gadget_start,
 810         .udc_stop               = dwc2_gadget_stop,
 811 #endif
 812 };
 813
 814 static struct dwc2_udc memory = {
 815         .usb_address = 0,
 816         .gadget = {
 817                 .ops = &dwc2_udc_ops,
 818                 .ep0 = &memory.ep[0].ep,
 819                 .name = driver_name,
 820         },
 821
 822         /* control endpoint */
 823         .ep[0] = {
 824                 .ep = {
 825                         .name = ep0name,
 826                         .ops = &dwc2_ep_ops,
 827                         .maxpacket = EP0_FIFO_SIZE,
 828                 },
 829                 .dev = &memory,
 830
 831                 .bEndpointAddress = 0,
 832                 .bmAttributes = 0,
 833
 834                 .ep_type = ep_control,
 835         },
 836
 837         /* first group of endpoints */
 838         .ep[1] = {
 839                 .ep = {
 840                         .name = "ep1in-bulk",
 841                         .ops = &dwc2_ep_ops,
 842                         .maxpacket = EP_FIFO_SIZE,
 843                 },
 844                 .dev = &memory,
 845
 846                 .bEndpointAddress = USB_DIR_IN | 1,
 847                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 848
 849                 .ep_type = ep_bulk_out,
 850                 .fifo_num = 1,
 851         },
 852
 853         .ep[2] = {
 854                 .ep = {
 855                         .name = "ep2out-bulk",
 856                         .ops = &dwc2_ep_ops,
 857                         .maxpacket = EP_FIFO_SIZE,
 858                 },
 859                 .dev = &memory,
 860
 861                 .bEndpointAddress = USB_DIR_OUT | 2,
 862                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 863
 864                 .ep_type = ep_bulk_in,
 865                 .fifo_num = 2,
 866         },
 867
 868         .ep[3] = {
 869                 .ep = {
 870                         .name = "ep3in-int",
 871                         .ops = &dwc2_ep_ops,
 872                         .maxpacket = EP_FIFO_SIZE,
 873                 },
 874                 .dev = &memory,
 875
 876                 .bEndpointAddress = USB_DIR_IN | 3,
 877                 .bmAttributes = USB_ENDPOINT_XFER_INT,
 878
 879                 .ep_type = ep_interrupt,
 880                 .fifo_num = 3,
 881         },
 882 };
 883
 884 /*
 885  *      probe - binds to the platform device
 886  */
 887
 888 int dwc2_udc_probe(struct dwc2_plat_otg_data *pdata)
 889 {
 890         struct dwc2_udc *dev = &memory;
 891         int retval = 0;
 892
 893         debug("%s: %p\n", __func__, pdata);
 894
 895         dev->pdata = pdata;
 896
 897         reg = (struct dwc2_usbotg_reg *)pdata->regs_otg;
 898
 899         dev->gadget.is_dualspeed = 1;   /* Hack only*/
 900         dev->gadget.is_otg = 0;
 901         dev->gadget.is_a_peripheral = 0;
 902         dev->gadget.b_hnp_enable = 0;
 903         dev->gadget.a_hnp_support = 0;
 904         dev->gadget.a_alt_hnp_support = 0;
 905
 906         the_controller = dev;
 907
 908         usb_ctrl = memalign(CONFIG_SYS_CACHELINE_SIZE,
 909                             ROUND(sizeof(struct usb_ctrlrequest),
 910                                   CONFIG_SYS_CACHELINE_SIZE));
 911         if (!usb_ctrl) {
 912                 pr_err("No memory available for UDC!\n");
 913                 return -ENOMEM;
 914         }
 915
 916         usb_ctrl_dma_addr = (dma_addr_t) usb_ctrl;
 917
 918         udc_reinit(dev);
 919
 920         return retval;
 921 }
 922
 923 int dwc2_udc_handle_interrupt(void)
 924 {
 925         u32 intr_status = readl(&reg->gintsts);
 926         u32 gintmsk = readl(&reg->gintmsk);
 927
 928         if (intr_status & gintmsk)
 929                 return dwc2_udc_irq(1, (void *)the_controller);
 930
 931         return 0;
 932 }
 933
 934 #if !CONFIG_IS_ENABLED(DM_USB_GADGET)
 935
 936 int usb_gadget_handle_interrupts(int index)
 937 {
 938         return dwc2_udc_handle_interrupt();
 939 }
 940
 941 #else /* CONFIG_IS_ENABLED(DM_USB_GADGET) */
 942
 943 struct dwc2_priv_data {
 944         struct clk_bulk         clks;
 945         struct reset_ctl_bulk   resets;
 946         struct phy *phys;
 947         int num_phys;
 948         struct udevice *usb33d_supply;
 949 };
 950
 951 int dm_usb_gadget_handle_interrupts(struct udevice *dev)
 952 {
 953         return dwc2_udc_handle_interrupt();
 954 }
 955
 956 int dwc2_phy_setup(struct udevice *dev, struct phy **array, int *num_phys)
 957 {
 958         int i, ret, count;
 959         struct phy *usb_phys;
 960
 961         /* Return if no phy declared */
 962         if (!dev_read_prop(dev, "phys", NULL))
 963                 return 0;
 964
 965         count = dev_count_phandle_with_args(dev, "phys", "#phy-cells");
 966         if (count <= 0)
 967                 return count;
 968
 969         usb_phys = devm_kcalloc(dev, count, sizeof(struct phy),
 970                                 GFP_KERNEL);
 971         if (!usb_phys)
 972                 return -ENOMEM;
 973
 974         for (i = 0; i < count; i++) {
 975                 ret = generic_phy_get_by_index(dev, i, &usb_phys[i]);
 976                 if (ret && ret != -ENOENT) {
 977                         dev_err(dev, "Failed to get USB PHY%d for %s\n",
 978                                 i, dev->name);
 979                         return ret;
 980                 }
 981         }
 982
 983         for (i = 0; i < count; i++) {
 984                 ret = generic_phy_init(&usb_phys[i]);
 985                 if (ret) {
 986                         dev_err(dev, "Can't init USB PHY%d for %s\n",
 987                                 i, dev->name);
 988                         goto phys_init_err;
 989                 }
 990         }
 991
 992         for (i = 0; i < count; i++) {
 993                 ret = generic_phy_power_on(&usb_phys[i]);
 994                 if (ret) {
 995                         dev_err(dev, "Can't power USB PHY%d for %s\n",
 996                                 i, dev->name);
 997                         goto phys_poweron_err;
 998                 }
 999         }
1000
1001         *array = usb_phys;
1002         *num_phys =  count;
1003
1004         return 0;
1005
1006 phys_poweron_err:
1007         for (i = count - 1; i >= 0; i--)
1008                 generic_phy_power_off(&usb_phys[i]);
1009
1010         for (i = 0; i < count; i++)
1011                 generic_phy_exit(&usb_phys[i]);
1012
1013         return ret;
1014
1015 phys_init_err:
1016         for (; i >= 0; i--)
1017                 generic_phy_exit(&usb_phys[i]);
1018
1019         return ret;
1020 }
1021
1022 void dwc2_phy_shutdown(struct udevice *dev, struct phy *usb_phys, int num_phys)
1023 {
1024         int i, ret;
1025
1026         for (i = 0; i < num_phys; i++) {
1027                 if (!generic_phy_valid(&usb_phys[i]))
1028                         continue;
1029
1030                 ret = generic_phy_power_off(&usb_phys[i]);
1031                 ret |= generic_phy_exit(&usb_phys[i]);
1032                 if (ret) {
1033                         dev_err(dev, "Can't shutdown USB PHY%d for %s\n",
1034                                 i, dev->name);
1035                 }
1036         }
1037 }
1038
1039 static int dwc2_udc_otg_ofdata_to_platdata(struct udevice *dev)
1040 {
1041         struct dwc2_plat_otg_data *platdata = dev_get_platdata(dev);
1042         ulong drvdata;
1043         void (*set_params)(struct dwc2_plat_otg_data *data);
1044         int ret;
1045
1046         if (usb_get_dr_mode(dev->node) != USB_DR_MODE_PERIPHERAL &&
1047             usb_get_dr_mode(dev->node) != USB_DR_MODE_OTG) {
1048                 dev_dbg(dev, "Invalid mode\n");
1049                 return -ENODEV;
1050         }
1051
1052         platdata->regs_otg = dev_read_addr(dev);
1053
1054         platdata->rx_fifo_sz = dev_read_u32_default(dev, "g-rx-fifo-size", 0);
1055         platdata->np_tx_fifo_sz = dev_read_u32_default(dev,
1056                                                        "g-np-tx-fifo-size", 0);
1057
1058         platdata->tx_fifo_sz_nb =
1059                 dev_read_size(dev, "g-tx-fifo-size") / sizeof(u32);
1060         if (platdata->tx_fifo_sz_nb > DWC2_MAX_HW_ENDPOINTS)
1061                 platdata->tx_fifo_sz_nb = DWC2_MAX_HW_ENDPOINTS;
1062         if (platdata->tx_fifo_sz_nb) {
1063                 ret = dev_read_u32_array(dev, "g-tx-fifo-size",
1064                                          platdata->tx_fifo_sz_array,
1065                                          platdata->tx_fifo_sz_nb);
1066                 if (ret)
1067                         return ret;
1068         }
1069
1070         platdata->force_b_session_valid =
1071                 dev_read_bool(dev, "u-boot,force-b-session-valid");
1072
1073         /* force platdata according compatible */
1074         drvdata = dev_get_driver_data(dev);
1075         if (drvdata) {
1076                 set_params = (void *)drvdata;
1077                 set_params(platdata);
1078         }
1079
1080         return 0;
1081 }
1082
1083 static void dwc2_set_stm32mp1_hsotg_params(struct dwc2_plat_otg_data *p)
1084 {
1085         p->activate_stm_id_vb_detection = true;
1086         p->usb_gusbcfg =
1087                 0 << 15         /* PHY Low Power Clock sel*/
1088                 | 0x9 << 10     /* USB Turnaround time (0x9 for HS phy) */
1089                 | 0 << 9        /* [0:HNP disable,1:HNP enable]*/
1090                 | 0 << 8        /* [0:SRP disable 1:SRP enable]*/
1091                 | 0 << 6        /* 0: high speed utmi+, 1: full speed serial*/
1092                 | 0x7 << 0;     /* FS timeout calibration**/
1093
1094         if (p->force_b_session_valid)
1095                 p->usb_gusbcfg |= 1 << 30; /* FDMOD: Force device mode */
1096 }
1097
1098 static int dwc2_udc_otg_reset_init(struct udevice *dev,
1099                                    struct reset_ctl_bulk *resets)
1100 {
1101         int ret;
1102
1103         ret = reset_get_bulk(dev, resets);
1104         if (ret == -ENOTSUPP)
1105                 return 0;
1106
1107         if (ret)
1108                 return ret;
1109
1110         ret = reset_assert_bulk(resets);
1111
1112         if (!ret) {
1113                 udelay(2);
1114                 ret = reset_deassert_bulk(resets);
1115         }
1116         if (ret) {
1117                 reset_release_bulk(resets);
1118                 return ret;
1119         }
1120
1121         return 0;
1122 }
1123
1124 static int dwc2_udc_otg_clk_init(struct udevice *dev,
1125                                  struct clk_bulk *clks)
1126 {
1127         int ret;
1128
1129         ret = clk_get_bulk(dev, clks);
1130         if (ret == -ENOSYS)
1131                 return 0;
1132
1133         if (ret)
1134                 return ret;
1135
1136         ret = clk_enable_bulk(clks);
1137         if (ret) {
1138                 clk_release_bulk(clks);
1139                 return ret;
1140         }
1141
1142         return 0;
1143 }
1144
1145 static int dwc2_udc_otg_probe(struct udevice *dev)
1146 {
1147         struct dwc2_plat_otg_data *platdata = dev_get_platdata(dev);
1148         struct dwc2_priv_data *priv = dev_get_priv(dev);
1149         struct dwc2_usbotg_reg *usbotg_reg =
1150                 (struct dwc2_usbotg_reg *)platdata->regs_otg;
1151         int ret;
1152
1153         ret = dwc2_udc_otg_clk_init(dev, &priv->clks);
1154         if (ret)
1155                 return ret;
1156
1157         ret = dwc2_udc_otg_reset_init(dev, &priv->resets);
1158         if (ret)
1159                 return ret;
1160
1161         ret = dwc2_phy_setup(dev, &priv->phys, &priv->num_phys);
1162         if (ret)
1163                 return ret;
1164
1165         if (CONFIG_IS_ENABLED(DM_REGULATOR) &&
1166             platdata->activate_stm_id_vb_detection &&
1167             !platdata->force_b_session_valid) {
1168                 ret = device_get_supply_regulator(dev, "usb33d-supply",
1169                                                   &priv->usb33d_supply);
1170                 if (ret) {
1171                         dev_err(dev, "can't get voltage level detector supply\n");
1172                         return ret;
1173                 }
1174                 ret = regulator_set_enable(priv->usb33d_supply, true);
1175                 if (ret) {
1176                         dev_err(dev, "can't enable voltage level detector supply\n");
1177                         return ret;
1178                 }
1179                 /* Enable vbus sensing */
1180                 setbits_le32(&usbotg_reg->ggpio,
1181                              GGPIO_STM32_OTG_GCCFG_VBDEN |
1182                              GGPIO_STM32_OTG_GCCFG_IDEN);
1183         }
1184
1185         if (platdata->force_b_session_valid)
1186                 /* Override B session bits : value and enable */
1187                 setbits_le32(&usbotg_reg->gotgctl,
1188                              A_VALOEN | A_VALOVAL | B_VALOEN | B_VALOVAL);
1189
1190         ret = dwc2_udc_probe(platdata);
1191         if (ret)
1192                 return ret;
1193
1194         the_controller->driver = 0;
1195
1196         ret = usb_add_gadget_udc((struct device *)dev, &the_controller->gadget);
1197
1198         return ret;
1199 }
1200
1201 static int dwc2_udc_otg_remove(struct udevice *dev)
1202 {
1203         struct dwc2_priv_data *priv = dev_get_priv(dev);
1204
1205         usb_del_gadget_udc(&the_controller->gadget);
1206
1207         reset_release_bulk(&priv->resets);
1208
1209         clk_release_bulk(&priv->clks);
1210
1211         dwc2_phy_shutdown(dev, priv->phys, priv->num_phys);
1212
1213         return dm_scan_fdt_dev(dev);
1214 }
1215
1216 static const struct udevice_id dwc2_udc_otg_ids[] = {
1217         { .compatible = "snps,dwc2" },
1218         { .compatible = "brcm,bcm2835-usb" },
1219         { .compatible = "st,stm32mp1-hsotg",
1220           .data = (ulong)dwc2_set_stm32mp1_hsotg_params },
1221         {},
1222 };
1223
1224 U_BOOT_DRIVER(dwc2_udc_otg) = {
1225         .name   = "dwc2-udc-otg",
1226         .id     = UCLASS_USB_GADGET_GENERIC,
1227         .of_match = dwc2_udc_otg_ids,
1228         .ofdata_to_platdata = dwc2_udc_otg_ofdata_to_platdata,
1229         .probe = dwc2_udc_otg_probe,
1230         .remove = dwc2_udc_otg_remove,
1231         .platdata_auto_alloc_size = sizeof(struct dwc2_plat_otg_data),
1232         .priv_auto_alloc_size = sizeof(struct dwc2_priv_data),
1233 };
1234
1235 int dwc2_udc_B_session_valid(struct udevice *dev)
1236 {
1237         struct dwc2_plat_otg_data *platdata = dev_get_platdata(dev);
1238         struct dwc2_usbotg_reg *usbotg_reg =
1239                 (struct dwc2_usbotg_reg *)platdata->regs_otg;
1240
1241         return readl(&usbotg_reg->gotgctl) & B_SESSION_VALID;
1242 }
1243 #endif /* CONFIG_IS_ENABLED(DM_USB_GADGET) */