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 <log.h>
  25 #include <malloc.h>
  26 #include <reset.h>
  27 #include <dm/device_compat.h>
  28 #include <dm/devres.h>
  29 #include <linux/bug.h>
  30 #include <linux/delay.h>
  31
  32 #include <linux/errno.h>
  33 #include <linux/list.h>
  34
  35 #include <linux/usb/ch9.h>
  36 #include <linux/usb/otg.h>
  37 #include <linux/usb/gadget.h>
  38
  39 #include <phys2bus.h>
  40 #include <asm/byteorder.h>
  41 #include <asm/unaligned.h>
  42 #include <asm/io.h>
  43
  44 #include <asm/mach-types.h>
  45
  46 #include <power/regulator.h>
  47
  48 #include "dwc2_udc_otg_regs.h"
  49 #include "dwc2_udc_otg_priv.h"
  50
  51 /***********************************************************/
  52
  53 #define OTG_DMA_MODE            1
  54
  55 #define DEBUG_SETUP 0
  56 #define DEBUG_EP0 0
  57 #define DEBUG_ISR 0
  58 #define DEBUG_OUT_EP 0
  59 #define DEBUG_IN_EP 0
  60
  61 #include <usb/dwc2_udc.h>
  62
  63 #define EP0_CON         0
  64 #define EP_MASK         0xF
  65
  66 static char *state_names[] = {
  67         "WAIT_FOR_SETUP",
  68         "DATA_STATE_XMIT",
  69         "DATA_STATE_NEED_ZLP",
  70         "WAIT_FOR_OUT_STATUS",
  71         "DATA_STATE_RECV",
  72         "WAIT_FOR_COMPLETE",
  73         "WAIT_FOR_OUT_COMPLETE",
  74         "WAIT_FOR_IN_COMPLETE",
  75         "WAIT_FOR_NULL_COMPLETE",
  76 };
  77
  78 #define DRIVER_VERSION "15 March 2009"
  79
  80 struct dwc2_udc *the_controller;
  81
  82 static const char driver_name[] = "dwc2-udc";
  83 static const char ep0name[] = "ep0-control";
  84
  85 /* Max packet size*/
  86 static unsigned int ep0_fifo_size = 64;
  87 static unsigned int ep_fifo_size =  512;
  88 static unsigned int ep_fifo_size2 = 1024;
  89 static int reset_available = 1;
  90
  91 static struct usb_ctrlrequest *usb_ctrl;
  92 static dma_addr_t usb_ctrl_dma_addr;
  93
  94 /*
  95   Local declarations.
  96 */
  97 static int dwc2_ep_enable(struct usb_ep *ep,
  98                          const struct usb_endpoint_descriptor *);
  99 static int dwc2_ep_disable(struct usb_ep *ep);
 100 static struct usb_request *dwc2_alloc_request(struct usb_ep *ep,
 101                                              gfp_t gfp_flags);
 102 static void dwc2_free_request(struct usb_ep *ep, struct usb_request *);
 103
 104 static int dwc2_queue(struct usb_ep *ep, struct usb_request *, gfp_t gfp_flags);
 105 static int dwc2_dequeue(struct usb_ep *ep, struct usb_request *);
 106 static int dwc2_fifo_status(struct usb_ep *ep);
 107 static void dwc2_fifo_flush(struct usb_ep *ep);
 108 static void dwc2_ep0_read(struct dwc2_udc *dev);
 109 static void dwc2_ep0_kick(struct dwc2_udc *dev, struct dwc2_ep *ep);
 110 static void dwc2_handle_ep0(struct dwc2_udc *dev);
 111 static int dwc2_ep0_write(struct dwc2_udc *dev);
 112 static int write_fifo_ep0(struct dwc2_ep *ep, struct dwc2_request *req);
 113 static void done(struct dwc2_ep *ep, struct dwc2_request *req, int status);
 114 static void stop_activity(struct dwc2_udc *dev,
 115                           struct usb_gadget_driver *driver);
 116 static int udc_enable(struct dwc2_udc *dev);
 117 static void udc_set_address(struct dwc2_udc *dev, unsigned char address);
 118 static void reconfig_usbd(struct dwc2_udc *dev);
 119 static void set_max_pktsize(struct dwc2_udc *dev, enum usb_device_speed speed);
 120 static void nuke(struct dwc2_ep *ep, int status);
 121 static int dwc2_udc_set_halt(struct usb_ep *_ep, int value);
 122 static void dwc2_udc_set_nak(struct dwc2_ep *ep);
 123
 124 void set_udc_gadget_private_data(void *p)
 125 {
 126         debug_cond(DEBUG_SETUP != 0,
 127                    "%s: the_controller: 0x%p, p: 0x%p\n", __func__,
 128                    the_controller, p);
 129         the_controller->gadget.dev.device_data = p;
 130 }
 131
 132 void *get_udc_gadget_private_data(struct usb_gadget *gadget)
 133 {
 134         return gadget->dev.device_data;
 135 }
 136
 137 static struct usb_ep_ops dwc2_ep_ops = {
 138         .enable = dwc2_ep_enable,
 139         .disable = dwc2_ep_disable,
 140
 141         .alloc_request = dwc2_alloc_request,
 142         .free_request = dwc2_free_request,
 143
 144         .queue = dwc2_queue,
 145         .dequeue = dwc2_dequeue,
 146
 147         .set_halt = dwc2_udc_set_halt,
 148         .fifo_status = dwc2_fifo_status,
 149         .fifo_flush = dwc2_fifo_flush,
 150 };
 151
 152 #define create_proc_files() do {} while (0)
 153 #define remove_proc_files() do {} while (0)
 154
 155 /***********************************************************/
 156
 157 struct dwc2_usbotg_reg *reg;
 158
 159 bool dfu_usb_get_reset(void)
 160 {
 161         return !!(readl(&reg->gintsts) & INT_RESET);
 162 }
 163
 164 __weak void otg_phy_init(struct dwc2_udc *dev) {}
 165 __weak void otg_phy_off(struct dwc2_udc *dev) {}
 166
 167 /***********************************************************/
 168
 169 #include "dwc2_udc_otg_xfer_dma.c"
 170
 171 /*
 172  *      udc_disable - disable USB device controller
 173  */
 174 static void udc_disable(struct dwc2_udc *dev)
 175 {
 176         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 177
 178         udc_set_address(dev, 0);
 179
 180         dev->ep0state = WAIT_FOR_SETUP;
 181         dev->gadget.speed = USB_SPEED_UNKNOWN;
 182         dev->usb_address = 0;
 183
 184         otg_phy_off(dev);
 185 }
 186
 187 /*
 188  *      udc_reinit - initialize software state
 189  */
 190 static void udc_reinit(struct dwc2_udc *dev)
 191 {
 192         unsigned int i;
 193
 194         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 195
 196         /* device/ep0 records init */
 197         INIT_LIST_HEAD(&dev->gadget.ep_list);
 198         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
 199         dev->ep0state = WAIT_FOR_SETUP;
 200
 201         /* basic endpoint records init */
 202         for (i = 0; i < DWC2_MAX_ENDPOINTS; i++) {
 203                 struct dwc2_ep *ep = &dev->ep[i];
 204
 205                 if (i != 0)
 206                         list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
 207
 208                 ep->desc = 0;
 209                 ep->stopped = 0;
 210                 INIT_LIST_HEAD(&ep->queue);
 211                 ep->pio_irqs = 0;
 212         }
 213
 214         /* the rest was statically initialized, and is read-only */
 215 }
 216
 217 #define BYTES2MAXP(x)   (x / 8)
 218 #define MAXP2BYTES(x)   (x * 8)
 219
 220 /* until it's enabled, this UDC should be completely invisible
 221  * to any USB host.
 222  */
 223 static int udc_enable(struct dwc2_udc *dev)
 224 {
 225         debug_cond(DEBUG_SETUP != 0, "%s: %p\n", __func__, dev);
 226
 227         otg_phy_init(dev);
 228         reconfig_usbd(dev);
 229
 230         debug_cond(DEBUG_SETUP != 0,
 231                    "DWC2 USB 2.0 OTG Controller Core Initialized : 0x%x\n",
 232                     readl(&reg->gintmsk));
 233
 234         dev->gadget.speed = USB_SPEED_UNKNOWN;
 235
 236         return 0;
 237 }
 238
 239 #if !CONFIG_IS_ENABLED(DM_USB_GADGET)
 240 /*
 241   Register entry point for the peripheral controller driver.
 242 */
 243 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 244 {
 245         struct dwc2_udc *dev = the_controller;
 246         int retval = 0;
 247         unsigned long flags = 0;
 248
 249         debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");
 250
 251         if (!driver || driver->speed < USB_SPEED_FULL
 252             || !driver->bind || !driver->disconnect || !driver->setup)
 253                 return -EINVAL;
 254         if (!dev)
 255                 return -ENODEV;
 256         if (dev->driver)
 257                 return -EBUSY;
 258
 259         spin_lock_irqsave(&dev->lock, flags);
 260         /* first hook up the driver ... */
 261         dev->driver = driver;
 262         spin_unlock_irqrestore(&dev->lock, flags);
 263
 264         if (retval) { /* TODO */
 265                 printf("target device_add failed, error %d\n", retval);
 266                 return retval;
 267         }
 268
 269         retval = driver->bind(&dev->gadget);
 270         if (retval) {
 271                 debug_cond(DEBUG_SETUP != 0,
 272                            "%s: bind to driver --> error %d\n",
 273                             dev->gadget.name, retval);
 274                 dev->driver = 0;
 275                 return retval;
 276         }
 277
 278         enable_irq(IRQ_OTG);
 279
 280         debug_cond(DEBUG_SETUP != 0,
 281                    "Registered gadget driver %s\n", dev->gadget.name);
 282         udc_enable(dev);
 283
 284         return 0;
 285 }
 286
 287 /*
 288  * Unregister entry point for the peripheral controller driver.
 289  */
 290 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 291 {
 292         struct dwc2_udc *dev = the_controller;
 293         unsigned long flags = 0;
 294
 295         if (!dev)
 296                 return -ENODEV;
 297         if (!driver || driver != dev->driver)
 298                 return -EINVAL;
 299
 300         spin_lock_irqsave(&dev->lock, flags);
 301         dev->driver = 0;
 302         stop_activity(dev, driver);
 303         spin_unlock_irqrestore(&dev->lock, flags);
 304
 305         driver->unbind(&dev->gadget);
 306
 307         disable_irq(IRQ_OTG);
 308
 309         udc_disable(dev);
 310         return 0;
 311 }
 312 #else /* !CONFIG_IS_ENABLED(DM_USB_GADGET) */
 313
 314 static int dwc2_gadget_start(struct usb_gadget *g,
 315                              struct usb_gadget_driver *driver)
 316 {
 317         struct dwc2_udc *dev = the_controller;
 318
 319         debug_cond(DEBUG_SETUP != 0, "%s: %s\n", __func__, "no name");
 320
 321         if (!driver || driver->speed < USB_SPEED_FULL ||
 322             !driver->bind || !driver->disconnect || !driver->setup)
 323                 return -EINVAL;
 324
 325         if (!dev)
 326                 return -ENODEV;
 327
 328         if (dev->driver)
 329                 return -EBUSY;
 330
 331         /* first hook up the driver ... */
 332         dev->driver = driver;
 333
 334         debug_cond(DEBUG_SETUP != 0,
 335                    "Registered gadget driver %s\n", dev->gadget.name);
 336         return udc_enable(dev);
 337 }
 338
 339 static int dwc2_gadget_stop(struct usb_gadget *g)
 340 {
 341         struct dwc2_udc *dev = the_controller;
 342
 343         if (!dev)
 344                 return -ENODEV;
 345
 346         if (!dev->driver)
 347                 return -EINVAL;
 348
 349         dev->driver = 0;
 350         stop_activity(dev, dev->driver);
 351
 352         udc_disable(dev);
 353
 354         return 0;
 355 }
 356
 357 #endif /* !CONFIG_IS_ENABLED(DM_USB_GADGET) */
 358
 359 /*
 360  *      done - retire a request; caller blocked irqs
 361  */
 362 static void done(struct dwc2_ep *ep, struct dwc2_request *req, int status)
 363 {
 364         unsigned int stopped = ep->stopped;
 365
 366         debug("%s: %s %p, req = %p, stopped = %d\n",
 367               __func__, ep->ep.name, ep, &req->req, stopped);
 368
 369         list_del_init(&req->queue);
 370
 371         if (likely(req->req.status == -EINPROGRESS))
 372                 req->req.status = status;
 373         else
 374                 status = req->req.status;
 375
 376         if (status && status != -ESHUTDOWN) {
 377                 debug("complete %s req %p stat %d len %u/%u\n",
 378                       ep->ep.name, &req->req, status,
 379                       req->req.actual, req->req.length);
 380         }
 381
 382         /* don't modify queue heads during completion callback */
 383         ep->stopped = 1;
 384
 385 #ifdef DEBUG
 386         printf("calling complete callback\n");
 387         {
 388                 int i, len = req->req.length;
 389
 390                 printf("pkt[%d] = ", req->req.length);
 391                 if (len > 64)
 392                         len = 64;
 393                 for (i = 0; i < len; i++) {
 394                         printf("%02x", ((u8 *)req->req.buf)[i]);
 395                         if ((i & 7) == 7)
 396                                 printf(" ");
 397                 }
 398                 printf("\n");
 399         }
 400 #endif
 401         spin_unlock(&ep->dev->lock);
 402         req->req.complete(&ep->ep, &req->req);
 403         spin_lock(&ep->dev->lock);
 404
 405         debug("callback completed\n");
 406
 407         ep->stopped = stopped;
 408 }
 409
 410 /*
 411  *      nuke - dequeue ALL requests
 412  */
 413 static void nuke(struct dwc2_ep *ep, int status)
 414 {
 415         struct dwc2_request *req;
 416
 417         debug("%s: %s %p\n", __func__, ep->ep.name, ep);
 418
 419         /* called with irqs blocked */
 420         while (!list_empty(&ep->queue)) {
 421                 req = list_entry(ep->queue.next, struct dwc2_request, queue);
 422                 done(ep, req, status);
 423         }
 424 }
 425
 426 static void stop_activity(struct dwc2_udc *dev,
 427                           struct usb_gadget_driver *driver)
 428 {
 429         int i;
 430
 431         /* don't disconnect drivers more than once */
 432         if (dev->gadget.speed == USB_SPEED_UNKNOWN)
 433                 driver = 0;
 434         dev->gadget.speed = USB_SPEED_UNKNOWN;
 435
 436         /* prevent new request submissions, kill any outstanding requests  */
 437         for (i = 0; i < DWC2_MAX_ENDPOINTS; i++) {
 438                 struct dwc2_ep *ep = &dev->ep[i];
 439                 ep->stopped = 1;
 440                 nuke(ep, -ESHUTDOWN);
 441         }
 442
 443         /* report disconnect; the driver is already quiesced */
 444         if (driver) {
 445                 spin_unlock(&dev->lock);
 446                 driver->disconnect(&dev->gadget);
 447                 spin_lock(&dev->lock);
 448         }
 449
 450         /* re-init driver-visible data structures */
 451         udc_reinit(dev);
 452 }
 453
 454 static void reconfig_usbd(struct dwc2_udc *dev)
 455 {
 456         /* 2. Soft-reset OTG Core and then unreset again. */
 457         int i;
 458         unsigned int uTemp = writel(CORE_SOFT_RESET, &reg->grstctl);
 459         uint32_t dflt_gusbcfg;
 460         uint32_t rx_fifo_sz, tx_fifo_sz, np_tx_fifo_sz;
 461         u32 max_hw_ep;
 462         int pdata_hw_ep;
 463
 464         debug("Reseting OTG controller\n");
 465
 466         dflt_gusbcfg =
 467                 0<<15           /* PHY Low Power Clock sel*/
 468                 |1<<14          /* Non-Periodic TxFIFO Rewind Enable*/
 469                 |0x5<<10        /* Turnaround time*/
 470                 |0<<9 | 0<<8    /* [0:HNP disable,1:HNP enable][ 0:SRP disable*/
 471                                 /* 1:SRP enable] H1= 1,1*/
 472                 |0<<7           /* Ulpi DDR sel*/
 473                 |0<<6           /* 0: high speed utmi+, 1: full speed serial*/
 474                 |0<<4           /* 0: utmi+, 1:ulpi*/
 475 #ifdef CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8
 476                 |0<<3           /* phy i/f  0:8bit, 1:16bit*/
 477 #else
 478                 |1<<3           /* phy i/f  0:8bit, 1:16bit*/
 479 #endif
 480                 |0x7<<0;        /* HS/FS Timeout**/
 481
 482         if (dev->pdata->usb_gusbcfg)
 483                 dflt_gusbcfg = dev->pdata->usb_gusbcfg;
 484
 485         writel(dflt_gusbcfg, &reg->gusbcfg);
 486
 487         /* 3. Put the OTG device core in the disconnected state.*/
 488         uTemp = readl(&reg->dctl);
 489         uTemp |= SOFT_DISCONNECT;
 490         writel(uTemp, &reg->dctl);
 491
 492         udelay(20);
 493
 494         /* 4. Make the OTG device core exit from the disconnected state.*/
 495         uTemp = readl(&reg->dctl);
 496         uTemp = uTemp & ~SOFT_DISCONNECT;
 497         writel(uTemp, &reg->dctl);
 498
 499         /* 5. Configure OTG Core to initial settings of device mode.*/
 500         /* [][1: full speed(30Mhz) 0:high speed]*/
 501         writel(EP_MISS_CNT(1) | DEV_SPEED_HIGH_SPEED_20, &reg->dcfg);
 502
 503         mdelay(1);
 504
 505         /* 6. Unmask the core interrupts*/
 506         writel(GINTMSK_INIT, &reg->gintmsk);
 507
 508         /* 7. Set NAK bit of EP0, EP1, EP2*/
 509         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[EP0_CON].doepctl);
 510         writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[EP0_CON].diepctl);
 511
 512         for (i = 1; i < DWC2_MAX_ENDPOINTS; i++) {
 513                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->out_endp[i].doepctl);
 514                 writel(DEPCTL_EPDIS|DEPCTL_SNAK, &reg->in_endp[i].diepctl);
 515         }
 516
 517         /* 8. Unmask EPO interrupts*/
 518         writel(((1 << EP0_CON) << DAINT_OUT_BIT)
 519                | (1 << EP0_CON), &reg->daintmsk);
 520
 521         /* 9. Unmask device OUT EP common interrupts*/
 522         writel(DOEPMSK_INIT, &reg->doepmsk);
 523
 524         /* 10. Unmask device IN EP common interrupts*/
 525         writel(DIEPMSK_INIT, &reg->diepmsk);
 526
 527         rx_fifo_sz = RX_FIFO_SIZE;
 528         np_tx_fifo_sz = NPTX_FIFO_SIZE;
 529         tx_fifo_sz = PTX_FIFO_SIZE;
 530
 531         if (dev->pdata->rx_fifo_sz)
 532                 rx_fifo_sz = dev->pdata->rx_fifo_sz;
 533         if (dev->pdata->np_tx_fifo_sz)
 534                 np_tx_fifo_sz = dev->pdata->np_tx_fifo_sz;
 535         if (dev->pdata->tx_fifo_sz)
 536                 tx_fifo_sz = dev->pdata->tx_fifo_sz;
 537
 538         /* 11. Set Rx FIFO Size (in 32-bit words) */
 539         writel(rx_fifo_sz, &reg->grxfsiz);
 540
 541         /* 12. Set Non Periodic Tx FIFO Size */
 542         writel((np_tx_fifo_sz << 16) | rx_fifo_sz,
 543                &reg->gnptxfsiz);
 544
 545         /* retrieve the number of IN Endpoints (excluding ep0) */
 546         max_hw_ep = (readl(&reg->ghwcfg4) & GHWCFG4_NUM_IN_EPS_MASK) >>
 547                     GHWCFG4_NUM_IN_EPS_SHIFT;
 548         pdata_hw_ep = dev->pdata->tx_fifo_sz_nb;
 549
 550         /* tx_fifo_sz_nb should equal to number of IN Endpoint */
 551         if (pdata_hw_ep && max_hw_ep != pdata_hw_ep)
 552                 pr_warn("Got %d hw endpoint but %d tx-fifo-size in array !!\n",
 553                         max_hw_ep, pdata_hw_ep);
 554
 555         for (i = 0; i < max_hw_ep; i++) {
 556                 if (pdata_hw_ep)
 557                         tx_fifo_sz = dev->pdata->tx_fifo_sz_array[i];
 558
 559                 writel((rx_fifo_sz + np_tx_fifo_sz + (tx_fifo_sz * i)) |
 560                         tx_fifo_sz << 16, &reg->dieptxf[i]);
 561         }
 562         /* Flush the RX FIFO */
 563         writel(RX_FIFO_FLUSH, &reg->grstctl);
 564         while (readl(&reg->grstctl) & RX_FIFO_FLUSH)
 565                 debug("%s: waiting for DWC2_UDC_OTG_GRSTCTL\n", __func__);
 566
 567         /* Flush all the Tx FIFO's */
 568         writel(TX_FIFO_FLUSH_ALL, &reg->grstctl);
 569         writel(TX_FIFO_FLUSH_ALL | TX_FIFO_FLUSH, &reg->grstctl);
 570         while (readl(&reg->grstctl) & TX_FIFO_FLUSH)
 571                 debug("%s: waiting for DWC2_UDC_OTG_GRSTCTL\n", __func__);
 572
 573         /* 13. Clear NAK bit of EP0, EP1, EP2*/
 574         /* For Slave mode*/
 575         /* EP0: Control OUT */
 576         writel(DEPCTL_EPDIS | DEPCTL_CNAK,
 577                &reg->out_endp[EP0_CON].doepctl);
 578
 579         /* 14. Initialize OTG Link Core.*/
 580         writel(GAHBCFG_INIT, &reg->gahbcfg);
 581 }
 582
 583 static void set_max_pktsize(struct dwc2_udc *dev, enum usb_device_speed speed)
 584 {
 585         unsigned int ep_ctrl;
 586         int i;
 587
 588         if (speed == USB_SPEED_HIGH) {
 589                 ep0_fifo_size = 64;
 590                 ep_fifo_size = 512;
 591                 ep_fifo_size2 = 1024;
 592                 dev->gadget.speed = USB_SPEED_HIGH;
 593         } else {
 594                 ep0_fifo_size = 64;
 595                 ep_fifo_size = 64;
 596                 ep_fifo_size2 = 64;
 597                 dev->gadget.speed = USB_SPEED_FULL;
 598         }
 599
 600         dev->ep[0].ep.maxpacket = ep0_fifo_size;
 601         for (i = 1; i < DWC2_MAX_ENDPOINTS; i++)
 602                 dev->ep[i].ep.maxpacket = ep_fifo_size;
 603
 604         /* EP0 - Control IN (64 bytes)*/
 605         ep_ctrl = readl(&reg->in_endp[EP0_CON].diepctl);
 606         writel(ep_ctrl|(0<<0), &reg->in_endp[EP0_CON].diepctl);
 607
 608         /* EP0 - Control OUT (64 bytes)*/
 609         ep_ctrl = readl(&reg->out_endp[EP0_CON].doepctl);
 610         writel(ep_ctrl|(0<<0), &reg->out_endp[EP0_CON].doepctl);
 611 }
 612
 613 static int dwc2_ep_enable(struct usb_ep *_ep,
 614                          const struct usb_endpoint_descriptor *desc)
 615 {
 616         struct dwc2_ep *ep;
 617         struct dwc2_udc *dev;
 618         unsigned long flags = 0;
 619
 620         debug("%s: %p\n", __func__, _ep);
 621
 622         ep = container_of(_ep, struct dwc2_ep, ep);
 623         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 624             || desc->bDescriptorType != USB_DT_ENDPOINT
 625             || ep->bEndpointAddress != desc->bEndpointAddress
 626             || ep_maxpacket(ep) <
 627             le16_to_cpu(get_unaligned(&desc->wMaxPacketSize))) {
 628
 629                 debug("%s: bad ep or descriptor\n", __func__);
 630                 return -EINVAL;
 631         }
 632
 633         /* xfer types must match, except that interrupt ~= bulk */
 634         if (ep->bmAttributes != desc->bmAttributes
 635             && ep->bmAttributes != USB_ENDPOINT_XFER_BULK
 636             && desc->bmAttributes != USB_ENDPOINT_XFER_INT) {
 637
 638                 debug("%s: %s type mismatch\n", __func__, _ep->name);
 639                 return -EINVAL;
 640         }
 641
 642         /* hardware _could_ do smaller, but driver doesn't */
 643         if ((desc->bmAttributes == USB_ENDPOINT_XFER_BULK &&
 644              le16_to_cpu(get_unaligned(&desc->wMaxPacketSize)) >
 645              ep_maxpacket(ep)) || !get_unaligned(&desc->wMaxPacketSize)) {
 646
 647                 debug("%s: bad %s maxpacket\n", __func__, _ep->name);
 648                 return -ERANGE;
 649         }
 650
 651         dev = ep->dev;
 652         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
 653
 654                 debug("%s: bogus device state\n", __func__);
 655                 return -ESHUTDOWN;
 656         }
 657
 658         ep->stopped = 0;
 659         ep->desc = desc;
 660         ep->pio_irqs = 0;
 661         ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 662
 663         /* Reset halt state */
 664         dwc2_udc_set_nak(ep);
 665         dwc2_udc_set_halt(_ep, 0);
 666
 667         spin_lock_irqsave(&ep->dev->lock, flags);
 668         dwc2_udc_ep_activate(ep);
 669         spin_unlock_irqrestore(&ep->dev->lock, flags);
 670
 671         debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
 672               __func__, _ep->name, ep->stopped, ep->ep.maxpacket);
 673         return 0;
 674 }
 675
 676 /*
 677  * Disable EP
 678  */
 679 static int dwc2_ep_disable(struct usb_ep *_ep)
 680 {
 681         struct dwc2_ep *ep;
 682         unsigned long flags = 0;
 683
 684         debug("%s: %p\n", __func__, _ep);
 685
 686         ep = container_of(_ep, struct dwc2_ep, ep);
 687         if (!_ep || !ep->desc) {
 688                 debug("%s: %s not enabled\n", __func__,
 689                       _ep ? ep->ep.name : NULL);
 690                 return -EINVAL;
 691         }
 692
 693         spin_lock_irqsave(&ep->dev->lock, flags);
 694
 695         /* Nuke all pending requests */
 696         nuke(ep, -ESHUTDOWN);
 697
 698         ep->desc = 0;
 699         ep->stopped = 1;
 700
 701         spin_unlock_irqrestore(&ep->dev->lock, flags);
 702
 703         debug("%s: disabled %s\n", __func__, _ep->name);
 704         return 0;
 705 }
 706
 707 static struct usb_request *dwc2_alloc_request(struct usb_ep *ep,
 708                                              gfp_t gfp_flags)
 709 {
 710         struct dwc2_request *req;
 711
 712         debug("%s: %s %p\n", __func__, ep->name, ep);
 713
 714         req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
 715         if (!req)
 716                 return 0;
 717
 718         memset(req, 0, sizeof *req);
 719         INIT_LIST_HEAD(&req->queue);
 720
 721         return &req->req;
 722 }
 723
 724 static void dwc2_free_request(struct usb_ep *ep, struct usb_request *_req)
 725 {
 726         struct dwc2_request *req;
 727
 728         debug("%s: %p\n", __func__, ep);
 729
 730         req = container_of(_req, struct dwc2_request, req);
 731         WARN_ON(!list_empty(&req->queue));
 732         kfree(req);
 733 }
 734
 735 /* dequeue JUST ONE request */
 736 static int dwc2_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 737 {
 738         struct dwc2_ep *ep;
 739         struct dwc2_request *req;
 740         unsigned long flags = 0;
 741
 742         debug("%s: %p\n", __func__, _ep);
 743
 744         ep = container_of(_ep, struct dwc2_ep, ep);
 745         if (!_ep || ep->ep.name == ep0name)
 746                 return -EINVAL;
 747
 748         spin_lock_irqsave(&ep->dev->lock, flags);
 749
 750         /* make sure it's actually queued on this endpoint */
 751         list_for_each_entry(req, &ep->queue, queue) {
 752                 if (&req->req == _req)
 753                         break;
 754         }
 755         if (&req->req != _req) {
 756                 spin_unlock_irqrestore(&ep->dev->lock, flags);
 757                 return -EINVAL;
 758         }
 759
 760         done(ep, req, -ECONNRESET);
 761
 762         spin_unlock_irqrestore(&ep->dev->lock, flags);
 763         return 0;
 764 }
 765
 766 /*
 767  * Return bytes in EP FIFO
 768  */
 769 static int dwc2_fifo_status(struct usb_ep *_ep)
 770 {
 771         int count = 0;
 772         struct dwc2_ep *ep;
 773
 774         ep = container_of(_ep, struct dwc2_ep, ep);
 775         if (!_ep) {
 776                 debug("%s: bad ep\n", __func__);
 777                 return -ENODEV;
 778         }
 779
 780         debug("%s: %d\n", __func__, ep_index(ep));
 781
 782         /* LPD can't report unclaimed bytes from IN fifos */
 783         if (ep_is_in(ep))
 784                 return -EOPNOTSUPP;
 785
 786         return count;
 787 }
 788
 789 /*
 790  * Flush EP FIFO
 791  */
 792 static void dwc2_fifo_flush(struct usb_ep *_ep)
 793 {
 794         struct dwc2_ep *ep;
 795
 796         ep = container_of(_ep, struct dwc2_ep, ep);
 797         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 798                 debug("%s: bad ep\n", __func__);
 799                 return;
 800         }
 801
 802         debug("%s: %d\n", __func__, ep_index(ep));
 803 }
 804
 805 static const struct usb_gadget_ops dwc2_udc_ops = {
 806         /* current versions must always be self-powered */
 807 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 808         .udc_start              = dwc2_gadget_start,
 809         .udc_stop               = dwc2_gadget_stop,
 810 #endif
 811 };
 812
 813 static struct dwc2_udc memory = {
 814         .usb_address = 0,
 815         .gadget = {
 816                 .ops = &dwc2_udc_ops,
 817                 .ep0 = &memory.ep[0].ep,
 818                 .name = driver_name,
 819         },
 820
 821         /* control endpoint */
 822         .ep[0] = {
 823                 .ep = {
 824                         .name = ep0name,
 825                         .ops = &dwc2_ep_ops,
 826                         .maxpacket = EP0_FIFO_SIZE,
 827                 },
 828                 .dev = &memory,
 829
 830                 .bEndpointAddress = 0,
 831                 .bmAttributes = 0,
 832
 833                 .ep_type = ep_control,
 834         },
 835
 836         /* first group of endpoints */
 837         .ep[1] = {
 838                 .ep = {
 839                         .name = "ep1in-bulk",
 840                         .ops = &dwc2_ep_ops,
 841                         .maxpacket = EP_FIFO_SIZE,
 842                 },
 843                 .dev = &memory,
 844
 845                 .bEndpointAddress = USB_DIR_IN | 1,
 846                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 847
 848                 .ep_type = ep_bulk_out,
 849                 .fifo_num = 1,
 850         },
 851
 852         .ep[2] = {
 853                 .ep = {
 854                         .name = "ep2out-bulk",
 855                         .ops = &dwc2_ep_ops,
 856                         .maxpacket = EP_FIFO_SIZE,
 857                 },
 858                 .dev = &memory,
 859
 860                 .bEndpointAddress = USB_DIR_OUT | 2,
 861                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 862
 863                 .ep_type = ep_bulk_in,
 864                 .fifo_num = 2,
 865         },
 866
 867         .ep[3] = {
 868                 .ep = {
 869                         .name = "ep3in-int",
 870                         .ops = &dwc2_ep_ops,
 871                         .maxpacket = EP_FIFO_SIZE,
 872                 },
 873                 .dev = &memory,
 874
 875                 .bEndpointAddress = USB_DIR_IN | 3,
 876                 .bmAttributes = USB_ENDPOINT_XFER_INT,
 877
 878                 .ep_type = ep_interrupt,
 879                 .fifo_num = 3,
 880         },
 881 };
 882
 883 /*
 884  *      probe - binds to the platform device
 885  */
 886
 887 int dwc2_udc_probe(struct dwc2_plat_otg_data *pdata)
 888 {
 889         struct dwc2_udc *dev = &memory;
 890         int retval = 0;
 891
 892         debug("%s: %p\n", __func__, pdata);
 893
 894         dev->pdata = pdata;
 895
 896         reg = (struct dwc2_usbotg_reg *)pdata->regs_otg;
 897
 898         dev->gadget.is_dualspeed = 1;   /* Hack only*/
 899         dev->gadget.is_otg = 0;
 900         dev->gadget.is_a_peripheral = 0;
 901         dev->gadget.b_hnp_enable = 0;
 902         dev->gadget.a_hnp_support = 0;
 903         dev->gadget.a_alt_hnp_support = 0;
 904
 905         the_controller = dev;
 906
 907         usb_ctrl = memalign(CONFIG_SYS_CACHELINE_SIZE,
 908                             ROUND(sizeof(struct usb_ctrlrequest),
 909                                   CONFIG_SYS_CACHELINE_SIZE));
 910         if (!usb_ctrl) {
 911                 pr_err("No memory available for UDC!\n");
 912                 return -ENOMEM;
 913         }
 914
 915         usb_ctrl_dma_addr = (dma_addr_t) usb_ctrl;
 916
 917         udc_reinit(dev);
 918
 919         return retval;
 920 }
 921
 922 int dwc2_udc_handle_interrupt(void)
 923 {
 924         u32 intr_status = readl(&reg->gintsts);
 925         u32 gintmsk = readl(&reg->gintmsk);
 926
 927         if (intr_status & gintmsk)
 928                 return dwc2_udc_irq(1, (void *)the_controller);
 929
 930         return 0;
 931 }
 932
 933 #if !CONFIG_IS_ENABLED(DM_USB_GADGET)
 934
 935 int usb_gadget_handle_interrupts(int index)
 936 {
 937         return dwc2_udc_handle_interrupt();
 938 }
 939
 940 #else /* CONFIG_IS_ENABLED(DM_USB_GADGET) */
 941
 942 struct dwc2_priv_data {
 943         struct clk_bulk         clks;
 944         struct reset_ctl_bulk   resets;
 945         struct phy_bulk phys;
 946         struct udevice *usb33d_supply;
 947 };
 948
 949 int dm_usb_gadget_handle_interrupts(struct udevice *dev)
 950 {
 951         return dwc2_udc_handle_interrupt();
 952 }
 953
 954 static int dwc2_phy_setup(struct udevice *dev, struct phy_bulk *phys)
 955 {
 956         int ret;
 957
 958         ret = generic_phy_get_bulk(dev, phys);
 959         if (ret)
 960                 return ret;
 961
 962         ret = generic_phy_init_bulk(phys);
 963         if (ret)
 964                 return ret;
 965
 966         ret = generic_phy_power_on_bulk(phys);
 967         if (ret)
 968                 generic_phy_exit_bulk(phys);
 969
 970         return ret;
 971 }
 972
 973 static void dwc2_phy_shutdown(struct udevice *dev, struct phy_bulk *phys)
 974 {
 975         generic_phy_power_off_bulk(phys);
 976         generic_phy_exit_bulk(phys);
 977 }
 978
 979 static int dwc2_udc_otg_of_to_plat(struct udevice *dev)
 980 {
 981         struct dwc2_plat_otg_data *plat = dev_get_plat(dev);
 982         ulong drvdata;
 983         void (*set_params)(struct dwc2_plat_otg_data *data);
 984         int ret;
 985
 986         if (usb_get_dr_mode(dev_ofnode(dev)) != USB_DR_MODE_PERIPHERAL &&
 987             usb_get_dr_mode(dev_ofnode(dev)) != USB_DR_MODE_OTG) {
 988                 dev_dbg(dev, "Invalid mode\n");
 989                 return -ENODEV;
 990         }
 991
 992         plat->regs_otg = dev_read_addr(dev);
 993
 994         plat->rx_fifo_sz = dev_read_u32_default(dev, "g-rx-fifo-size", 0);
 995         plat->np_tx_fifo_sz = dev_read_u32_default(dev, "g-np-tx-fifo-size", 0);
 996
 997         plat->tx_fifo_sz_nb =
 998                 dev_read_size(dev, "g-tx-fifo-size") / sizeof(u32);
 999         if (plat->tx_fifo_sz_nb > DWC2_MAX_HW_ENDPOINTS)
1000                 plat->tx_fifo_sz_nb = DWC2_MAX_HW_ENDPOINTS;
1001         if (plat->tx_fifo_sz_nb) {
1002                 ret = dev_read_u32_array(dev, "g-tx-fifo-size",
1003                                          plat->tx_fifo_sz_array,
1004                                          plat->tx_fifo_sz_nb);
1005                 if (ret)
1006                         return ret;
1007         }
1008
1009         plat->force_b_session_valid =
1010                 dev_read_bool(dev, "u-boot,force-b-session-valid");
1011
1012         plat->force_vbus_detection =
1013                 dev_read_bool(dev, "u-boot,force-vbus-detection");
1014
1015         /* force plat according compatible */
1016         drvdata = dev_get_driver_data(dev);
1017         if (drvdata) {
1018                 set_params = (void *)drvdata;
1019                 set_params(plat);
1020         }
1021
1022         return 0;
1023 }
1024
1025 static void dwc2_set_stm32mp1_hsotg_params(struct dwc2_plat_otg_data *p)
1026 {
1027         p->activate_stm_id_vb_detection = true;
1028         p->usb_gusbcfg =
1029                 0 << 15         /* PHY Low Power Clock sel*/
1030                 | 0x9 << 10     /* USB Turnaround time (0x9 for HS phy) */
1031                 | 0 << 9        /* [0:HNP disable,1:HNP enable]*/
1032                 | 0 << 8        /* [0:SRP disable 1:SRP enable]*/
1033                 | 0 << 6        /* 0: high speed utmi+, 1: full speed serial*/
1034                 | 0x7 << 0;     /* FS timeout calibration**/
1035
1036         if (p->force_b_session_valid)
1037                 p->usb_gusbcfg |= 1 << 30; /* FDMOD: Force device mode */
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 || ret == -ENOENT)
1047                 return 0;
1048
1049         if (ret)
1050                 return ret;
1051
1052         ret = reset_assert_bulk(resets);
1053
1054         if (!ret) {
1055                 udelay(2);
1056                 ret = reset_deassert_bulk(resets);
1057         }
1058         if (ret) {
1059                 reset_release_bulk(resets);
1060                 return ret;
1061         }
1062
1063         return 0;
1064 }
1065
1066 static int dwc2_udc_otg_clk_init(struct udevice *dev,
1067                                  struct clk_bulk *clks)
1068 {
1069         int ret;
1070
1071         ret = clk_get_bulk(dev, clks);
1072         if (ret == -ENOSYS)
1073                 return 0;
1074
1075         if (ret)
1076                 return ret;
1077
1078         ret = clk_enable_bulk(clks);
1079         if (ret) {
1080                 clk_release_bulk(clks);
1081                 return ret;
1082         }
1083
1084         return 0;
1085 }
1086
1087 static int dwc2_udc_otg_probe(struct udevice *dev)
1088 {
1089         struct dwc2_plat_otg_data *plat = dev_get_plat(dev);
1090         struct dwc2_priv_data *priv = dev_get_priv(dev);
1091         struct dwc2_usbotg_reg *usbotg_reg =
1092                 (struct dwc2_usbotg_reg *)plat->regs_otg;
1093         int ret;
1094
1095         ret = dwc2_udc_otg_clk_init(dev, &priv->clks);
1096         if (ret)
1097                 return ret;
1098
1099         ret = dwc2_udc_otg_reset_init(dev, &priv->resets);
1100         if (ret)
1101                 return ret;
1102
1103         ret = dwc2_phy_setup(dev, &priv->phys);
1104         if (ret)
1105                 return ret;
1106
1107         if (plat->activate_stm_id_vb_detection) {
1108                 if (CONFIG_IS_ENABLED(DM_REGULATOR) &&
1109                     (!plat->force_b_session_valid ||
1110                      plat->force_vbus_detection)) {
1111                         ret = device_get_supply_regulator(dev, "usb33d-supply",
1112                                                           &priv->usb33d_supply);
1113                         if (ret) {
1114                                 dev_err(dev, "can't get voltage level detector supply\n");
1115                                 return ret;
1116                         }
1117                         ret = regulator_set_enable(priv->usb33d_supply, true);
1118                         if (ret) {
1119                                 dev_err(dev, "can't enable voltage level detector supply\n");
1120                                 return ret;
1121                         }
1122                 }
1123
1124                 if (plat->force_b_session_valid &&
1125                     !plat->force_vbus_detection) {
1126                         /* Override VBUS detection: enable then value*/
1127                         setbits_le32(&usbotg_reg->gotgctl, VB_VALOEN);
1128                         setbits_le32(&usbotg_reg->gotgctl, VB_VALOVAL);
1129                 } else {
1130                         /* Enable VBUS sensing */
1131                         setbits_le32(&usbotg_reg->ggpio,
1132                                      GGPIO_STM32_OTG_GCCFG_VBDEN);
1133                 }
1134                 if (plat->force_b_session_valid) {
1135                         /* Override B session bits: enable then value */
1136                         setbits_le32(&usbotg_reg->gotgctl, A_VALOEN | B_VALOEN);
1137                         setbits_le32(&usbotg_reg->gotgctl,
1138                                      A_VALOVAL | B_VALOVAL);
1139                 } else {
1140                         /* Enable ID detection */
1141                         setbits_le32(&usbotg_reg->ggpio,
1142                                      GGPIO_STM32_OTG_GCCFG_IDEN);
1143                 }
1144         }
1145
1146         ret = dwc2_udc_probe(plat);
1147         if (ret)
1148                 return ret;
1149
1150         the_controller->driver = 0;
1151
1152         ret = usb_add_gadget_udc((struct device *)dev, &the_controller->gadget);
1153
1154         return ret;
1155 }
1156
1157 static int dwc2_udc_otg_remove(struct udevice *dev)
1158 {
1159         struct dwc2_priv_data *priv = dev_get_priv(dev);
1160
1161         usb_del_gadget_udc(&the_controller->gadget);
1162
1163         reset_release_bulk(&priv->resets);
1164
1165         clk_release_bulk(&priv->clks);
1166
1167         dwc2_phy_shutdown(dev, &priv->phys);
1168
1169         return dm_scan_fdt_dev(dev);
1170 }
1171
1172 static const struct udevice_id dwc2_udc_otg_ids[] = {
1173         { .compatible = "snps,dwc2" },
1174         { .compatible = "brcm,bcm2835-usb" },
1175         { .compatible = "st,stm32mp15-hsotg",
1176           .data = (ulong)dwc2_set_stm32mp1_hsotg_params },
1177         {},
1178 };
1179
1180 U_BOOT_DRIVER(dwc2_udc_otg) = {
1181         .name   = "dwc2-udc-otg",
1182         .id     = UCLASS_USB_GADGET_GENERIC,
1183         .of_match = dwc2_udc_otg_ids,
1184         .of_to_plat = dwc2_udc_otg_of_to_plat,
1185         .probe = dwc2_udc_otg_probe,
1186         .remove = dwc2_udc_otg_remove,
1187         .plat_auto      = sizeof(struct dwc2_plat_otg_data),
1188         .priv_auto      = sizeof(struct dwc2_priv_data),
1189 };
1190
1191 int dwc2_udc_B_session_valid(struct udevice *dev)
1192 {
1193         struct dwc2_plat_otg_data *plat = dev_get_plat(dev);
1194         struct dwc2_usbotg_reg *usbotg_reg =
1195                 (struct dwc2_usbotg_reg *)plat->regs_otg;
1196
1197         return readl(&usbotg_reg->gotgctl) & B_SESSION_VALID;
1198 }
1199 #endif /* CONFIG_IS_ENABLED(DM_USB_GADGET) */