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         u32 max_hw_ep;
 460
 461         debug("Reseting OTG controller\n");
 462
 463         dflt_gusbcfg =
 464                 0<<15           /* PHY Low Power Clock sel*/
 465                 |1<<14          /* Non-Periodic TxFIFO Rewind Enable*/
 466                 |0x5<<10        /* Turnaround time*/
 467                 |0<<9 | 0<<8    /* [0:HNP disable,1:HNP enable][ 0:SRP disable*/
 468                                 /* 1:SRP enable] H1= 1,1*/
 469                 |0<<7           /* Ulpi DDR sel*/
 470                 |0<<6           /* 0: high speed utmi+, 1: full speed serial*/
 471                 |0<<4           /* 0: utmi+, 1:ulpi*/
 472 #ifdef CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8
 473                 |0<<3           /* phy i/f  0:8bit, 1:16bit*/
 474 #else
 475                 |1<<3           /* phy i/f  0:8bit, 1:16bit*/
 476 #endif
 477                 |0x7<<0;        /* HS/FS Timeout**/
 478
 479         if (dev->pdata->usb_gusbcfg)
 480                 dflt_gusbcfg = dev->pdata->usb_gusbcfg;
 481
 482         writel(dflt_gusbcfg, &reg->gusbcfg);
 483
 484         /* 3. Put the OTG device core in the disconnected state.*/
 485         uTemp = readl(&reg->dctl);
 486         uTemp |= SOFT_DISCONNECT;
 487         writel(uTemp, &reg->dctl);
 488
 489         udelay(20);
 490
 491         /* 4. Make the OTG device core exit from the disconnected state.*/
 492         uTemp = readl(&reg->dctl);
 493         uTemp = uTemp & ~SOFT_DISCONNECT;
 494         writel(uTemp, &reg->dctl);
 495
 496         /* 5. Configure OTG Core to initial settings of device mode.*/
 497         /* [][1: full speed(30Mhz) 0:high speed]*/
 498         writel(EP_MISS_CNT(1) | DEV_SPEED_HIGH_SPEED_20, &reg->dcfg);
 499
 500         mdelay(1);
 501
 502         /* 6. Unmask the core interrupts*/
 503         writel(GINTMSK_INIT, &reg->gintmsk);
 504
 505         /* 7. Set NAK bit of EP0, EP1, EP2*/
 506         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[EP0_CON].doepctl);
 507         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[EP0_CON].diepctl);
 508
 509         for (i = 1; i < DWC2_MAX_ENDPOINTS; i++) {
 510                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[i].doepctl);
 511                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[i].diepctl);
 512         }
 513
 514         /* 8. Unmask EPO interrupts*/
 515         writel(((1 << EP0_CON) << DAINT_OUT_BIT)
 516                | (1 << EP0_CON), &reg->daintmsk);
 517
 518         /* 9. Unmask device OUT EP common interrupts*/
 519         writel(DOEPMSK_INIT, &reg->doepmsk);
 520
 521         /* 10. Unmask device IN EP common interrupts*/
 522         writel(DIEPMSK_INIT, &reg->diepmsk);
 523
 524         rx_fifo_sz = RX_FIFO_SIZE;
 525         np_tx_fifo_sz = NPTX_FIFO_SIZE;
 526         tx_fifo_sz = PTX_FIFO_SIZE;
 527
 528         if (dev->pdata->rx_fifo_sz)
 529                 rx_fifo_sz = dev->pdata->rx_fifo_sz;
 530         if (dev->pdata->np_tx_fifo_sz)
 531                 np_tx_fifo_sz = dev->pdata->np_tx_fifo_sz;
 532         if (dev->pdata->tx_fifo_sz)
 533                 tx_fifo_sz = dev->pdata->tx_fifo_sz;
 534
 535         /* 11. Set Rx FIFO Size (in 32-bit words) */
 536         writel(rx_fifo_sz, &reg->grxfsiz);
 537
 538         /* 12. Set Non Periodic Tx FIFO Size */
 539         writel((np_tx_fifo_sz << 16) | rx_fifo_sz,
 540                &reg->gnptxfsiz);
 541
 542         /* retrieve the number of IN Endpoints (excluding ep0) */
 543         max_hw_ep = (readl(&reg->ghwcfg4) & GHWCFG4_NUM_IN_EPS_MASK) >>
 544                     GHWCFG4_NUM_IN_EPS_SHIFT;
 545
 546         for (i = 0; i < max_hw_ep; i++)
 547                 writel((rx_fifo_sz + np_tx_fifo_sz + (tx_fifo_sz * i)) |
 548                         tx_fifo_sz << 16, &reg->dieptxf[i]);
 549
 550         /* Flush the RX FIFO */
 551         writel(RX_FIFO_FLUSH, &reg->grstctl);
 552         while (readl(&reg->grstctl) & RX_FIFO_FLUSH)
 553                 debug("%s: waiting for DWC2_UDC_OTG_GRSTCTL\n", __func__);
 554
 555         /* Flush all the Tx FIFO's */
 556         writel(TX_FIFO_FLUSH_ALL, &reg->grstctl);
 557         writel(TX_FIFO_FLUSH_ALL | TX_FIFO_FLUSH, &reg->grstctl);
 558         while (readl(&reg->grstctl) & TX_FIFO_FLUSH)
 559                 debug("%s: waiting for DWC2_UDC_OTG_GRSTCTL\n", __func__);
 560
 561         /* 13. Clear NAK bit of EP0, EP1, EP2*/
 562         /* For Slave mode*/
 563         /* EP0: Control OUT */
 564         writel(DEPCTL_EPDIS | DEPCTL_CNAK,
 565                &reg->out_endp[EP0_CON].doepctl);
 566
 567         /* 14. Initialize OTG Link Core.*/
 568         writel(GAHBCFG_INIT, &reg->gahbcfg);
 569 }
 570
 571 static void set_max_pktsize(struct dwc2_udc *dev, enum usb_device_speed speed)
 572 {
 573         unsigned int ep_ctrl;
 574         int i;
 575
 576         if (speed == USB_SPEED_HIGH) {
 577                 ep0_fifo_size = 64;
 578                 ep_fifo_size = 512;
 579                 ep_fifo_size2 = 1024;
 580                 dev->gadget.speed = USB_SPEED_HIGH;
 581         } else {
 582                 ep0_fifo_size = 64;
 583                 ep_fifo_size = 64;
 584                 ep_fifo_size2 = 64;
 585                 dev->gadget.speed = USB_SPEED_FULL;
 586         }
 587
 588         dev->ep[0].ep.maxpacket = ep0_fifo_size;
 589         for (i = 1; i < DWC2_MAX_ENDPOINTS; i++)
 590                 dev->ep[i].ep.maxpacket = ep_fifo_size;
 591
 592         /* EP0 - Control IN (64 bytes)*/
 593         ep_ctrl = readl(&reg->in_endp[EP0_CON].diepctl);
 594         writel(ep_ctrl|(0<<0), &reg->in_endp[EP0_CON].diepctl);
 595
 596         /* EP0 - Control OUT (64 bytes)*/
 597         ep_ctrl = readl(&reg->out_endp[EP0_CON].doepctl);
 598         writel(ep_ctrl|(0<<0), &reg->out_endp[EP0_CON].doepctl);
 599 }
 600
 601 static int dwc2_ep_enable(struct usb_ep *_ep,
 602                          const struct usb_endpoint_descriptor *desc)
 603 {
 604         struct dwc2_ep *ep;
 605         struct dwc2_udc *dev;
 606         unsigned long flags = 0;
 607
 608         debug("%s: %p\n", __func__, _ep);
 609
 610         ep = container_of(_ep, struct dwc2_ep, ep);
 611         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 612             || desc->bDescriptorType != USB_DT_ENDPOINT
 613             || ep->bEndpointAddress != desc->bEndpointAddress
 614             || ep_maxpacket(ep) <
 615             le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
 616
 617                 debug("%s: bad ep or descriptor\n", __func__);
 618                 return -EINVAL;
 619         }
 620
 621         /* xfer types must match, except that interrupt ~= bulk */
 622         if (ep->bmAttributes != desc->bmAttributes
 623             && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 624             && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 625
 626                 debug("%s: %s type mismatch\n", __func__, _ep->name);
 627                 return -EINVAL;
 628         }
 629
 630         /* hardware _could_ do smaller, but driver doesn't */
 631         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK &&
 632              le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) >
 633              ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) {
 634
 635                 debug("%s: bad %s maxpacket\n", __func__, _ep->name);
 636                 return -ERANGE;
 637         }
 638
 639         dev = ep->dev;
 640         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 641
 642                 debug("%s: bogus device state\n", __func__);
 643                 return -ESHUTDOWN;
 644         }
 645
 646         ep->stopped = 0;
 647         ep->desc = desc;
 648         ep->pio_irqs = 0;
 649         ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 650
 651         /* Reset halt state */
 652         dwc2_udc_set_nak(ep);
 653         dwc2_udc_set_halt(_ep, 0);
 654
 655         spin_lock_irqsave(&ep->dev->lock, flags);
 656         dwc2_udc_ep_activate(ep);
 657         spin_unlock_irqrestore(&ep->dev->lock, flags);
 658
 659         debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
 660               __func__, _ep->name, ep->stopped, ep->ep.maxpacket);
 661         return 0;
 662 }
 663
 664 /*
 665  * Disable EP
 666  */
 667 static int dwc2_ep_disable(struct usb_ep *_ep)
 668 {
 669         struct dwc2_ep *ep;
 670         unsigned long flags = 0;
 671
 672         debug("%s: %p\n", __func__, _ep);
 673
 674         ep = container_of(_ep, struct dwc2_ep, ep);
 675         if (!_ep || !ep->desc) {
 676                 debug("%s: %s not enabled\n", __func__,
 677                       _ep ? ep->ep.name : NULL);
 678                 return -EINVAL;
 679         }
 680
 681         spin_lock_irqsave(&ep->dev->lock, flags);
 682
 683         /* Nuke all pending requests */
 684         nuke(ep, -ESHUTDOWN);
 685
 686         ep->desc = 0;
 687         ep->stopped = 1;
 688
 689         spin_unlock_irqrestore(&ep->dev->lock, flags);
 690
 691         debug("%s: disabled %s\n", __func__, _ep->name);
 692         return 0;
 693 }
 694
 695 static struct usb_request *dwc2_alloc_request(struct usb_ep *ep,
 696                                              gfp_t gfp_flags)
 697 {
 698         struct dwc2_request *req;
 699
 700         debug("%s: %s %p\n", __func__, ep->name, ep);
 701
 702         req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
 703         if (!req)
 704                 return 0;
 705
 706         memset(req, 0, sizeof *req);
 707         INIT_LIST_HEAD(&req->queue);
 708
 709         return &req->req;
 710 }
 711
 712 static void dwc2_free_request(struct usb_ep *ep, struct usb_request *_req)
 713 {
 714         struct dwc2_request *req;
 715
 716         debug("%s: %p\n", __func__, ep);
 717
 718         req = container_of(_req, struct dwc2_request, req);
 719         WARN_ON(!list_empty(&req->queue));
 720         kfree(req);
 721 }
 722
 723 /* dequeue JUST ONE request */
 724 static int dwc2_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 725 {
 726         struct dwc2_ep *ep;
 727         struct dwc2_request *req;
 728         unsigned long flags = 0;
 729
 730         debug("%s: %p\n", __func__, _ep);
 731
 732         ep = container_of(_ep, struct dwc2_ep, ep);
 733         if (!_ep || ep->ep.name == ep0name)
 734                 return -EINVAL;
 735
 736         spin_lock_irqsave(&ep->dev->lock, flags);
 737
 738         /* make sure it's actually queued on this endpoint */
 739         list_for_each_entry(req, &ep->queue, queue) {
 740                 if (&req->req == _req)
 741                         break;
 742         }
 743         if (&req->req != _req) {
 744                 spin_unlock_irqrestore(&ep->dev->lock, flags);
 745                 return -EINVAL;
 746         }
 747
 748         done(ep, req, -ECONNRESET);
 749
 750         spin_unlock_irqrestore(&ep->dev->lock, flags);
 751         return 0;
 752 }
 753
 754 /*
 755  * Return bytes in EP FIFO
 756  */
 757 static int dwc2_fifo_status(struct usb_ep *_ep)
 758 {
 759         int count = 0;
 760         struct dwc2_ep *ep;
 761
 762         ep = container_of(_ep, struct dwc2_ep, ep);
 763         if (!_ep) {
 764                 debug("%s: bad ep\n", __func__);
 765                 return -ENODEV;
 766         }
 767
 768         debug("%s: %d\n", __func__, ep_index(ep));
 769
 770         /* LPD can't report unclaimed bytes from IN fifos */
 771         if (ep_is_in(ep))
 772                 return -EOPNOTSUPP;
 773
 774         return count;
 775 }
 776
 777 /*
 778  * Flush EP FIFO
 779  */
 780 static void dwc2_fifo_flush(struct usb_ep *_ep)
 781 {
 782         struct dwc2_ep *ep;
 783
 784         ep = container_of(_ep, struct dwc2_ep, ep);
 785         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 786                 debug("%s: bad ep\n", __func__);
 787                 return;
 788         }
 789
 790         debug("%s: %d\n", __func__, ep_index(ep));
 791 }
 792
 793 static const struct usb_gadget_ops dwc2_udc_ops = {
 794         /* current versions must always be self-powered */
 795 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 796         .udc_start              = dwc2_gadget_start,
 797         .udc_stop               = dwc2_gadget_stop,
 798 #endif
 799 };
 800
 801 static struct dwc2_udc memory = {
 802         .usb_address = 0,
 803         .gadget = {
 804                 .ops = &dwc2_udc_ops,
 805                 .ep0 = &memory.ep[0].ep,
 806                 .name = driver_name,
 807         },
 808
 809         /* control endpoint */
 810         .ep[0] = {
 811                 .ep = {
 812                         .name = ep0name,
 813                         .ops = &dwc2_ep_ops,
 814                         .maxpacket = EP0_FIFO_SIZE,
 815                 },
 816                 .dev = &memory,
 817
 818                 .bEndpointAddress = 0,
 819                 .bmAttributes = 0,
 820
 821                 .ep_type = ep_control,
 822         },
 823
 824         /* first group of endpoints */
 825         .ep[1] = {
 826                 .ep = {
 827                         .name = "ep1in-bulk",
 828                         .ops = &dwc2_ep_ops,
 829                         .maxpacket = EP_FIFO_SIZE,
 830                 },
 831                 .dev = &memory,
 832
 833                 .bEndpointAddress = USB_DIR_IN | 1,
 834                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 835
 836                 .ep_type = ep_bulk_out,
 837                 .fifo_num = 1,
 838         },
 839
 840         .ep[2] = {
 841                 .ep = {
 842                         .name = "ep2out-bulk",
 843                         .ops = &dwc2_ep_ops,
 844                         .maxpacket = EP_FIFO_SIZE,
 845                 },
 846                 .dev = &memory,
 847
 848                 .bEndpointAddress = USB_DIR_OUT | 2,
 849                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 850
 851                 .ep_type = ep_bulk_in,
 852                 .fifo_num = 2,
 853         },
 854
 855         .ep[3] = {
 856                 .ep = {
 857                         .name = "ep3in-int",
 858                         .ops = &dwc2_ep_ops,
 859                         .maxpacket = EP_FIFO_SIZE,
 860                 },
 861                 .dev = &memory,
 862
 863                 .bEndpointAddress = USB_DIR_IN | 3,
 864                 .bmAttributes = USB_ENDPOINT_XFER_INT,
 865
 866                 .ep_type = ep_interrupt,
 867                 .fifo_num = 3,
 868         },
 869 };
 870
 871 /*
 872  *      probe - binds to the platform device
 873  */
 874
 875 int dwc2_udc_probe(struct dwc2_plat_otg_data *pdata)
 876 {
 877         struct dwc2_udc *dev = &memory;
 878         int retval = 0;
 879
 880         debug("%s: %p\n", __func__, pdata);
 881
 882         dev->pdata = pdata;
 883
 884         reg = (struct dwc2_usbotg_reg *)pdata->regs_otg;
 885
 886         dev->gadget.is_dualspeed = 1;   /* Hack only*/
 887         dev->gadget.is_otg = 0;
 888         dev->gadget.is_a_peripheral = 0;
 889         dev->gadget.b_hnp_enable = 0;
 890         dev->gadget.a_hnp_support = 0;
 891         dev->gadget.a_alt_hnp_support = 0;
 892
 893         the_controller = dev;
 894
 895         usb_ctrl = memalign(CONFIG_SYS_CACHELINE_SIZE,
 896                             ROUND(sizeof(struct usb_ctrlrequest),
 897                                   CONFIG_SYS_CACHELINE_SIZE));
 898         if (!usb_ctrl) {
 899                 pr_err("No memory available for UDC!\n");
 900                 return -ENOMEM;
 901         }
 902
 903         usb_ctrl_dma_addr = (dma_addr_t) usb_ctrl;
 904
 905         udc_reinit(dev);
 906
 907         return retval;
 908 }
 909
 910 int dwc2_udc_handle_interrupt(void)
 911 {
 912         u32 intr_status = readl(&reg->gintsts);
 913         u32 gintmsk = readl(&reg->gintmsk);
 914
 915         if (intr_status & gintmsk)
 916                 return dwc2_udc_irq(1, (void *)the_controller);
 917
 918         return 0;
 919 }
 920
 921 #if !CONFIG_IS_ENABLED(DM_USB_GADGET)
 922
 923 int usb_gadget_handle_interrupts(int index)
 924 {
 925         return dwc2_udc_handle_interrupt();
 926 }
 927
 928 #else /* CONFIG_IS_ENABLED(DM_USB_GADGET) */
 929
 930 struct dwc2_priv_data {
 931         struct clk_bulk         clks;
 932         struct reset_ctl_bulk   resets;
 933         struct phy *phys;
 934         int num_phys;
 935 };
 936
 937 int dm_usb_gadget_handle_interrupts(struct udevice *dev)
 938 {
 939         return dwc2_udc_handle_interrupt();
 940 }
 941
 942 int dwc2_phy_setup(struct udevice *dev, struct phy **array, int *num_phys)
 943 {
 944         int i, ret, count;
 945         struct phy *usb_phys;
 946
 947         /* Return if no phy declared */
 948         if (!dev_read_prop(dev, "phys", NULL))
 949                 return 0;
 950
 951         count = dev_count_phandle_with_args(dev, "phys", "#phy-cells");
 952         if (count <= 0)
 953                 return count;
 954
 955         usb_phys = devm_kcalloc(dev, count, sizeof(struct phy),
 956                                 GFP_KERNEL);
 957         if (!usb_phys)
 958                 return -ENOMEM;
 959
 960         for (i = 0; i < count; i++) {
 961                 ret = generic_phy_get_by_index(dev, i, &usb_phys[i]);
 962                 if (ret && ret != -ENOENT) {
 963                         dev_err(dev, "Failed to get USB PHY%d for %s\n",
 964                                 i, dev->name);
 965                         return ret;
 966                 }
 967         }
 968
 969         for (i = 0; i < count; i++) {
 970                 ret = generic_phy_init(&usb_phys[i]);
 971                 if (ret) {
 972                         dev_err(dev, "Can't init USB PHY%d for %s\n",
 973                                 i, dev->name);
 974                         goto phys_init_err;
 975                 }
 976         }
 977
 978         for (i = 0; i < count; i++) {
 979                 ret = generic_phy_power_on(&usb_phys[i]);
 980                 if (ret) {
 981                         dev_err(dev, "Can't power USB PHY%d for %s\n",
 982                                 i, dev->name);
 983                         goto phys_poweron_err;
 984                 }
 985         }
 986
 987         *array = usb_phys;
 988         *num_phys =  count;
 989
 990         return 0;
 991
 992 phys_poweron_err:
 993         for (i = count - 1; i >= 0; i--)
 994                 generic_phy_power_off(&usb_phys[i]);
 995
 996         for (i = 0; i < count; i++)
 997                 generic_phy_exit(&usb_phys[i]);
 998
 999         return ret;
1000
1001 phys_init_err:
1002         for (; i >= 0; i--)
1003                 generic_phy_exit(&usb_phys[i]);
1004
1005         return ret;
1006 }
1007
1008 void dwc2_phy_shutdown(struct udevice *dev, struct phy *usb_phys, int num_phys)
1009 {
1010         int i, ret;
1011
1012         for (i = 0; i < num_phys; i++) {
1013                 if (!generic_phy_valid(&usb_phys[i]))
1014                         continue;
1015
1016                 ret = generic_phy_power_off(&usb_phys[i]);
1017                 ret |= generic_phy_exit(&usb_phys[i]);
1018                 if (ret) {
1019                         dev_err(dev, "Can't shutdown USB PHY%d for %s\n",
1020                                 i, dev->name);
1021                 }
1022         }
1023 }
1024
1025 static int dwc2_udc_otg_ofdata_to_platdata(struct udevice *dev)
1026 {
1027         struct dwc2_plat_otg_data *platdata = dev_get_platdata(dev);
1028         int node = dev_of_offset(dev);
1029
1030         if (usb_get_dr_mode(node) != USB_DR_MODE_PERIPHERAL) {
1031                 dev_dbg(dev, "Invalid mode\n");
1032                 return -ENODEV;
1033         }
1034
1035         platdata->regs_otg = dev_read_addr(dev);
1036
1037         platdata->rx_fifo_sz = dev_read_u32_default(dev, "g-rx-fifo-size", 0);
1038         platdata->np_tx_fifo_sz = dev_read_u32_default(dev,
1039                                                        "g-np-tx-fifo-size", 0);
1040         platdata->tx_fifo_sz = dev_read_u32_default(dev, "g-tx-fifo-size", 0);
1041
1042         platdata->force_b_session_valid =
1043                 dev_read_bool(dev, "force-b-session-valid");
1044
1045         return 0;
1046 }
1047
1048 static int dwc2_udc_otg_reset_init(struct udevice *dev,
1049                                    struct reset_ctl_bulk *resets)
1050 {
1051         int ret;
1052
1053         ret = reset_get_bulk(dev, resets);
1054         if (ret == -ENOTSUPP)
1055                 return 0;
1056
1057         if (ret)
1058                 return ret;
1059
1060         ret = reset_assert_bulk(resets);
1061
1062         if (!ret) {
1063                 udelay(2);
1064                 ret = reset_deassert_bulk(resets);
1065         }
1066         if (ret) {
1067                 reset_release_bulk(resets);
1068                 return ret;
1069         }
1070
1071         return 0;
1072 }
1073
1074 static int dwc2_udc_otg_clk_init(struct udevice *dev,
1075                                  struct clk_bulk *clks)
1076 {
1077         int ret;
1078
1079         ret = clk_get_bulk(dev, clks);
1080         if (ret == -ENOSYS)
1081                 return 0;
1082
1083         if (ret)
1084                 return ret;
1085
1086         ret = clk_enable_bulk(clks);
1087         if (ret) {
1088                 clk_release_bulk(clks);
1089                 return ret;
1090         }
1091
1092         return 0;
1093 }
1094
1095 static int dwc2_udc_otg_probe(struct udevice *dev)
1096 {
1097         struct dwc2_plat_otg_data *platdata = dev_get_platdata(dev);
1098         struct dwc2_priv_data *priv = dev_get_priv(dev);
1099         struct dwc2_usbotg_reg *usbotg_reg =
1100                 (struct dwc2_usbotg_reg *)platdata->regs_otg;
1101         int ret;
1102
1103         ret = dwc2_udc_otg_clk_init(dev, &priv->clks);
1104         if (ret)
1105                 return ret;
1106
1107         ret = dwc2_udc_otg_reset_init(dev, &priv->resets);
1108         if (ret)
1109                 return ret;
1110
1111         ret = dwc2_phy_setup(dev, &priv->phys, &priv->num_phys);
1112         if (ret)
1113                 return ret;
1114
1115         if (platdata->force_b_session_valid)
1116                 /* Override B session bits : value and enable */
1117                 setbits_le32(&usbotg_reg->gotgctl,  B_VALOEN | B_VALOVAL);
1118
1119         ret = dwc2_udc_probe(platdata);
1120         if (ret)
1121                 return ret;
1122
1123         the_controller->driver = 0;
1124
1125         ret = usb_add_gadget_udc((struct device *)dev, &the_controller->gadget);
1126
1127         return ret;
1128 }
1129
1130 static int dwc2_udc_otg_remove(struct udevice *dev)
1131 {
1132         struct dwc2_priv_data *priv = dev_get_priv(dev);
1133
1134         usb_del_gadget_udc(&the_controller->gadget);
1135
1136         reset_release_bulk(&priv->resets);
1137
1138         clk_release_bulk(&priv->clks);
1139
1140         dwc2_phy_shutdown(dev, priv->phys, priv->num_phys);
1141
1142         return dm_scan_fdt_dev(dev);
1143 }
1144
1145 static const struct udevice_id dwc2_udc_otg_ids[] = {
1146         { .compatible = "snps,dwc2" },
1147 };
1148
1149 U_BOOT_DRIVER(dwc2_udc_otg) = {
1150         .name   = "dwc2-udc-otg",
1151         .id     = UCLASS_USB_GADGET_GENERIC,
1152         .of_match = dwc2_udc_otg_ids,
1153         .ofdata_to_platdata = dwc2_udc_otg_ofdata_to_platdata,
1154         .probe = dwc2_udc_otg_probe,
1155         .remove = dwc2_udc_otg_remove,
1156         .platdata_auto_alloc_size = sizeof(struct dwc2_plat_otg_data),
1157         .priv_auto_alloc_size = sizeof(struct dwc2_priv_data),
1158 };
1159
1160 int dwc2_udc_B_session_valid(struct udevice *dev)
1161 {
1162         struct dwc2_plat_otg_data *platdata = dev_get_platdata(dev);
1163         struct dwc2_usbotg_reg *usbotg_reg =
1164                 (struct dwc2_usbotg_reg *)platdata->regs_otg;
1165
1166         return readl(&usbotg_reg->gotgctl) & B_SESSION_VALID;
1167 }
1168 #endif /* CONFIG_IS_ENABLED(DM_USB_GADGET) */