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