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->desc = desc;
 659         ep->stopped = 0;
 660         ep->desc = desc;
 661         ep->pio_irqs = 0;
 662         ep->ep.maxpacket = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
 663
 664         /* Reset halt state */
 665         dwc2_udc_set_nak(ep);
 666         dwc2_udc_set_halt(_ep, 0);
 667
 668         spin_lock_irqsave(&ep->dev->lock, flags);
 669         dwc2_udc_ep_activate(ep);
 670         spin_unlock_irqrestore(&ep->dev->lock, flags);
 671
 672         debug("%s: enabled %s, stopped = %d, maxpacket = %d\n",
 673               __func__, _ep->name, ep->stopped, ep->ep.maxpacket);
 674         return 0;
 675 }
 676
 677 /*
 678  * Disable EP
 679  */
 680 static int dwc2_ep_disable(struct usb_ep *_ep)
 681 {
 682         struct dwc2_ep *ep;
 683         unsigned long flags = 0;
 684
 685         debug("%s: %p\n", __func__, _ep);
 686
 687         ep = container_of(_ep, struct dwc2_ep, ep);
 688         if (!_ep || !ep->desc) {
 689                 debug("%s: %s not enabled\n", __func__,
 690                       _ep ? ep->ep.name : NULL);
 691                 return -EINVAL;
 692         }
 693
 694         spin_lock_irqsave(&ep->dev->lock, flags);
 695
 696         /* Nuke all pending requests */
 697         nuke(ep, -ESHUTDOWN);
 698
 699         _ep->desc = NULL;
 700         ep->desc = 0;
 701         ep->stopped = 1;
 702
 703         spin_unlock_irqrestore(&ep->dev->lock, flags);
 704
 705         debug("%s: disabled %s\n", __func__, _ep->name);
 706         return 0;
 707 }
 708
 709 static struct usb_request *dwc2_alloc_request(struct usb_ep *ep,
 710                                              gfp_t gfp_flags)
 711 {
 712         struct dwc2_request *req;
 713
 714         debug("%s: %s %p\n", __func__, ep->name, ep);
 715
 716         req = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*req));
 717         if (!req)
 718                 return 0;
 719
 720         memset(req, 0, sizeof *req);
 721         INIT_LIST_HEAD(&req->queue);
 722
 723         return &req->req;
 724 }
 725
 726 static void dwc2_free_request(struct usb_ep *ep, struct usb_request *_req)
 727 {
 728         struct dwc2_request *req;
 729
 730         debug("%s: %p\n", __func__, ep);
 731
 732         req = container_of(_req, struct dwc2_request, req);
 733         WARN_ON(!list_empty(&req->queue));
 734         kfree(req);
 735 }
 736
 737 /* dequeue JUST ONE request */
 738 static int dwc2_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 739 {
 740         struct dwc2_ep *ep;
 741         struct dwc2_request *req;
 742         unsigned long flags = 0;
 743
 744         debug("%s: %p\n", __func__, _ep);
 745
 746         ep = container_of(_ep, struct dwc2_ep, ep);
 747         if (!_ep || ep->ep.name == ep0name)
 748                 return -EINVAL;
 749
 750         spin_lock_irqsave(&ep->dev->lock, flags);
 751
 752         /* make sure it's actually queued on this endpoint */
 753         list_for_each_entry(req, &ep->queue, queue) {
 754                 if (&req->req == _req)
 755                         break;
 756         }
 757         if (&req->req != _req) {
 758                 spin_unlock_irqrestore(&ep->dev->lock, flags);
 759                 return -EINVAL;
 760         }
 761
 762         done(ep, req, -ECONNRESET);
 763
 764         spin_unlock_irqrestore(&ep->dev->lock, flags);
 765         return 0;
 766 }
 767
 768 /*
 769  * Return bytes in EP FIFO
 770  */
 771 static int dwc2_fifo_status(struct usb_ep *_ep)
 772 {
 773         int count = 0;
 774         struct dwc2_ep *ep;
 775
 776         ep = container_of(_ep, struct dwc2_ep, ep);
 777         if (!_ep) {
 778                 debug("%s: bad ep\n", __func__);
 779                 return -ENODEV;
 780         }
 781
 782         debug("%s: %d\n", __func__, ep_index(ep));
 783
 784         /* LPD can't report unclaimed bytes from IN fifos */
 785         if (ep_is_in(ep))
 786                 return -EOPNOTSUPP;
 787
 788         return count;
 789 }
 790
 791 /*
 792  * Flush EP FIFO
 793  */
 794 static void dwc2_fifo_flush(struct usb_ep *_ep)
 795 {
 796         struct dwc2_ep *ep;
 797
 798         ep = container_of(_ep, struct dwc2_ep, ep);
 799         if (unlikely(!_ep || (!ep->desc && ep->ep.name != ep0name))) {
 800                 debug("%s: bad ep\n", __func__);
 801                 return;
 802         }
 803
 804         debug("%s: %d\n", __func__, ep_index(ep));
 805 }
 806
 807 static const struct usb_gadget_ops dwc2_udc_ops = {
 808         /* current versions must always be self-powered */
 809 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 810         .udc_start              = dwc2_gadget_start,
 811         .udc_stop               = dwc2_gadget_stop,
 812 #endif
 813 };
 814
 815 static struct dwc2_udc memory = {
 816         .usb_address = 0,
 817         .gadget = {
 818                 .ops = &dwc2_udc_ops,
 819                 .ep0 = &memory.ep[0].ep,
 820                 .name = driver_name,
 821         },
 822
 823         /* control endpoint */
 824         .ep[0] = {
 825                 .ep = {
 826                         .name = ep0name,
 827                         .ops = &dwc2_ep_ops,
 828                         .maxpacket = EP0_FIFO_SIZE,
 829                 },
 830                 .dev = &memory,
 831
 832                 .bEndpointAddress = 0,
 833                 .bmAttributes = 0,
 834
 835                 .ep_type = ep_control,
 836         },
 837
 838         /* first group of endpoints */
 839         .ep[1] = {
 840                 .ep = {
 841                         .name = "ep1in-bulk",
 842                         .ops = &dwc2_ep_ops,
 843                         .maxpacket = EP_FIFO_SIZE,
 844                 },
 845                 .dev = &memory,
 846
 847                 .bEndpointAddress = USB_DIR_IN | 1,
 848                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 849
 850                 .ep_type = ep_bulk_out,
 851                 .fifo_num = 1,
 852         },
 853
 854         .ep[2] = {
 855                 .ep = {
 856                         .name = "ep2out-bulk",
 857                         .ops = &dwc2_ep_ops,
 858                         .maxpacket = EP_FIFO_SIZE,
 859                 },
 860                 .dev = &memory,
 861
 862                 .bEndpointAddress = USB_DIR_OUT | 2,
 863                 .bmAttributes = USB_ENDPOINT_XFER_BULK,
 864
 865                 .ep_type = ep_bulk_in,
 866                 .fifo_num = 2,
 867         },
 868
 869         .ep[3] = {
 870                 .ep = {
 871                         .name = "ep3in-int",
 872                         .ops = &dwc2_ep_ops,
 873                         .maxpacket = EP_FIFO_SIZE,
 874                 },
 875                 .dev = &memory,
 876
 877                 .bEndpointAddress = USB_DIR_IN | 3,
 878                 .bmAttributes = USB_ENDPOINT_XFER_INT,
 879
 880                 .ep_type = ep_interrupt,
 881                 .fifo_num = 3,
 882         },
 883 };
 884
 885 /*
 886  *      probe - binds to the platform device
 887  */
 888
 889 int dwc2_udc_probe(struct dwc2_plat_otg_data *pdata)
 890 {
 891         struct dwc2_udc *dev = &memory;
 892         int retval = 0;
 893
 894         debug("%s: %p\n", __func__, pdata);
 895
 896         dev->pdata = pdata;
 897
 898         reg = (struct dwc2_usbotg_reg *)pdata->regs_otg;
 899
 900         dev->gadget.is_dualspeed = 1;   /* Hack only*/
 901         dev->gadget.is_otg = 0;
 902         dev->gadget.is_a_peripheral = 0;
 903         dev->gadget.b_hnp_enable = 0;
 904         dev->gadget.a_hnp_support = 0;
 905         dev->gadget.a_alt_hnp_support = 0;
 906
 907         the_controller = dev;
 908
 909         usb_ctrl = memalign(CONFIG_SYS_CACHELINE_SIZE,
 910                             ROUND(sizeof(struct usb_ctrlrequest),
 911                                   CONFIG_SYS_CACHELINE_SIZE));
 912         if (!usb_ctrl) {
 913                 pr_err("No memory available for UDC!\n");
 914                 return -ENOMEM;
 915         }
 916
 917         usb_ctrl_dma_addr = (dma_addr_t) usb_ctrl;
 918
 919         udc_reinit(dev);
 920
 921         return retval;
 922 }
 923
 924 int dwc2_udc_handle_interrupt(void)
 925 {
 926         u32 intr_status = readl(&reg->gintsts);
 927         u32 gintmsk = readl(&reg->gintmsk);
 928
 929         if (intr_status & gintmsk)
 930                 return dwc2_udc_irq(1, (void *)the_controller);
 931
 932         return 0;
 933 }
 934
 935 #if !CONFIG_IS_ENABLED(DM_USB_GADGET)
 936
 937 int usb_gadget_handle_interrupts(int index)
 938 {
 939         return dwc2_udc_handle_interrupt();
 940 }
 941
 942 #else /* CONFIG_IS_ENABLED(DM_USB_GADGET) */
 943
 944 struct dwc2_priv_data {
 945         struct clk_bulk         clks;
 946         struct reset_ctl_bulk   resets;
 947         struct phy_bulk phys;
 948         struct udevice *usb33d_supply;
 949 };
 950
 951 int dm_usb_gadget_handle_interrupts(struct udevice *dev)
 952 {
 953         return dwc2_udc_handle_interrupt();
 954 }
 955
 956 static int dwc2_phy_setup(struct udevice *dev, struct phy_bulk *phys)
 957 {
 958         int ret;
 959
 960         ret = generic_phy_get_bulk(dev, phys);
 961         if (ret)
 962                 return ret;
 963
 964         ret = generic_phy_init_bulk(phys);
 965         if (ret)
 966                 return ret;
 967
 968         ret = generic_phy_power_on_bulk(phys);
 969         if (ret)
 970                 generic_phy_exit_bulk(phys);
 971
 972         return ret;
 973 }
 974
 975 static void dwc2_phy_shutdown(struct udevice *dev, struct phy_bulk *phys)
 976 {
 977         generic_phy_power_off_bulk(phys);
 978         generic_phy_exit_bulk(phys);
 979 }
 980
 981 static int dwc2_udc_otg_of_to_plat(struct udevice *dev)
 982 {
 983         struct dwc2_plat_otg_data *plat = dev_get_plat(dev);
 984         ulong drvdata;
 985         void (*set_params)(struct dwc2_plat_otg_data *data);
 986         int ret;
 987
 988         if (usb_get_dr_mode(dev_ofnode(dev)) != USB_DR_MODE_PERIPHERAL &&
 989             usb_get_dr_mode(dev_ofnode(dev)) != USB_DR_MODE_OTG) {
 990                 dev_dbg(dev, "Invalid mode\n");
 991                 return -ENODEV;
 992         }
 993
 994         plat->regs_otg = dev_read_addr(dev);
 995
 996         plat->rx_fifo_sz = dev_read_u32_default(dev, "g-rx-fifo-size", 0);
 997         plat->np_tx_fifo_sz = dev_read_u32_default(dev, "g-np-tx-fifo-size", 0);
 998
 999         plat->tx_fifo_sz_nb =
1000                 dev_read_size(dev, "g-tx-fifo-size") / sizeof(u32);
1001         if (plat->tx_fifo_sz_nb > DWC2_MAX_HW_ENDPOINTS)
1002                 plat->tx_fifo_sz_nb = DWC2_MAX_HW_ENDPOINTS;
1003         if (plat->tx_fifo_sz_nb) {
1004                 ret = dev_read_u32_array(dev, "g-tx-fifo-size",
1005                                          plat->tx_fifo_sz_array,
1006                                          plat->tx_fifo_sz_nb);
1007                 if (ret)
1008                         return ret;
1009         }
1010
1011         plat->force_b_session_valid =
1012                 dev_read_bool(dev, "u-boot,force-b-session-valid");
1013
1014         plat->force_vbus_detection =
1015                 dev_read_bool(dev, "u-boot,force-vbus-detection");
1016
1017         /* force plat according compatible */
1018         drvdata = dev_get_driver_data(dev);
1019         if (drvdata) {
1020                 set_params = (void *)drvdata;
1021                 set_params(plat);
1022         }
1023
1024         return 0;
1025 }
1026
1027 static void dwc2_set_stm32mp1_hsotg_params(struct dwc2_plat_otg_data *p)
1028 {
1029         p->activate_stm_id_vb_detection = true;
1030         p->usb_gusbcfg =
1031                 0 << 15         /* PHY Low Power Clock sel*/
1032                 | 0x9 << 10     /* USB Turnaround time (0x9 for HS phy) */
1033                 | 0 << 9        /* [0:HNP disable,1:HNP enable]*/
1034                 | 0 << 8        /* [0:SRP disable 1:SRP enable]*/
1035                 | 0 << 6        /* 0: high speed utmi+, 1: full speed serial*/
1036                 | 0x7 << 0;     /* FS timeout calibration**/
1037
1038         if (p->force_b_session_valid)
1039                 p->usb_gusbcfg |= 1 << 30; /* FDMOD: Force device mode */
1040 }
1041
1042 static int dwc2_udc_otg_reset_init(struct udevice *dev,
1043                                    struct reset_ctl_bulk *resets)
1044 {
1045         int ret;
1046
1047         ret = reset_get_bulk(dev, resets);
1048         if (ret == -ENOTSUPP || ret == -ENOENT)
1049                 return 0;
1050
1051         if (ret)
1052                 return ret;
1053
1054         ret = reset_assert_bulk(resets);
1055
1056         if (!ret) {
1057                 udelay(2);
1058                 ret = reset_deassert_bulk(resets);
1059         }
1060         if (ret) {
1061                 reset_release_bulk(resets);
1062                 return ret;
1063         }
1064
1065         return 0;
1066 }
1067
1068 static int dwc2_udc_otg_clk_init(struct udevice *dev,
1069                                  struct clk_bulk *clks)
1070 {
1071         int ret;
1072
1073         ret = clk_get_bulk(dev, clks);
1074         if (ret == -ENOSYS)
1075                 return 0;
1076
1077         if (ret)
1078                 return ret;
1079
1080         ret = clk_enable_bulk(clks);
1081         if (ret) {
1082                 clk_release_bulk(clks);
1083                 return ret;
1084         }
1085
1086         return 0;
1087 }
1088
1089 static int dwc2_udc_otg_probe(struct udevice *dev)
1090 {
1091         struct dwc2_plat_otg_data *plat = dev_get_plat(dev);
1092         struct dwc2_priv_data *priv = dev_get_priv(dev);
1093         struct dwc2_usbotg_reg *usbotg_reg =
1094                 (struct dwc2_usbotg_reg *)plat->regs_otg;
1095         int ret;
1096
1097         ret = dwc2_udc_otg_clk_init(dev, &priv->clks);
1098         if (ret)
1099                 return ret;
1100
1101         ret = dwc2_udc_otg_reset_init(dev, &priv->resets);
1102         if (ret)
1103                 return ret;
1104
1105         ret = dwc2_phy_setup(dev, &priv->phys);
1106         if (ret)
1107                 return ret;
1108
1109         if (plat->activate_stm_id_vb_detection) {
1110                 if (CONFIG_IS_ENABLED(DM_REGULATOR) &&
1111                     (!plat->force_b_session_valid ||
1112                      plat->force_vbus_detection)) {
1113                         ret = device_get_supply_regulator(dev, "usb33d-supply",
1114                                                           &priv->usb33d_supply);
1115                         if (ret) {
1116                                 dev_err(dev, "can't get voltage level detector supply\n");
1117                                 return ret;
1118                         }
1119                         ret = regulator_set_enable(priv->usb33d_supply, true);
1120                         if (ret) {
1121                                 dev_err(dev, "can't enable voltage level detector supply\n");
1122                                 return ret;
1123                         }
1124                 }
1125
1126                 if (plat->force_b_session_valid &&
1127                     !plat->force_vbus_detection) {
1128                         /* Override VBUS detection: enable then value*/
1129                         setbits_le32(&usbotg_reg->gotgctl, VB_VALOEN);
1130                         setbits_le32(&usbotg_reg->gotgctl, VB_VALOVAL);
1131                 } else {
1132                         /* Enable VBUS sensing */
1133                         setbits_le32(&usbotg_reg->ggpio,
1134                                      GGPIO_STM32_OTG_GCCFG_VBDEN);
1135                 }
1136                 if (plat->force_b_session_valid) {
1137                         /* Override B session bits: enable then value */
1138                         setbits_le32(&usbotg_reg->gotgctl, A_VALOEN | B_VALOEN);
1139                         setbits_le32(&usbotg_reg->gotgctl,
1140                                      A_VALOVAL | B_VALOVAL);
1141                 } else {
1142                         /* Enable ID detection */
1143                         setbits_le32(&usbotg_reg->ggpio,
1144                                      GGPIO_STM32_OTG_GCCFG_IDEN);
1145                 }
1146         }
1147
1148         ret = dwc2_udc_probe(plat);
1149         if (ret)
1150                 return ret;
1151
1152         the_controller->driver = 0;
1153
1154         ret = usb_add_gadget_udc((struct device *)dev, &the_controller->gadget);
1155
1156         return ret;
1157 }
1158
1159 static int dwc2_udc_otg_remove(struct udevice *dev)
1160 {
1161         struct dwc2_priv_data *priv = dev_get_priv(dev);
1162
1163         usb_del_gadget_udc(&the_controller->gadget);
1164
1165         reset_release_bulk(&priv->resets);
1166
1167         clk_release_bulk(&priv->clks);
1168
1169         dwc2_phy_shutdown(dev, &priv->phys);
1170
1171         return dm_scan_fdt_dev(dev);
1172 }
1173
1174 static const struct udevice_id dwc2_udc_otg_ids[] = {
1175         { .compatible = "snps,dwc2" },
1176         { .compatible = "brcm,bcm2835-usb" },
1177         { .compatible = "st,stm32mp15-hsotg",
1178           .data = (ulong)dwc2_set_stm32mp1_hsotg_params },
1179         {},
1180 };
1181
1182 U_BOOT_DRIVER(dwc2_udc_otg) = {
1183         .name   = "dwc2-udc-otg",
1184         .id     = UCLASS_USB_GADGET_GENERIC,
1185         .of_match = dwc2_udc_otg_ids,
1186         .of_to_plat = dwc2_udc_otg_of_to_plat,
1187         .probe = dwc2_udc_otg_probe,
1188         .remove = dwc2_udc_otg_remove,
1189         .plat_auto      = sizeof(struct dwc2_plat_otg_data),
1190         .priv_auto      = sizeof(struct dwc2_priv_data),
1191 };
1192
1193 int dwc2_udc_B_session_valid(struct udevice *dev)
1194 {
1195         struct dwc2_plat_otg_data *plat = dev_get_plat(dev);
1196         struct dwc2_usbotg_reg *usbotg_reg =
1197                 (struct dwc2_usbotg_reg *)plat->regs_otg;
1198
1199         return readl(&usbotg_reg->gotgctl) & B_SESSION_VALID;
1200 }
1201 #endif /* CONFIG_IS_ENABLED(DM_USB_GADGET) */