drivers/usb/gadget/atmel_usba_udc.c

   1 /*
   2  * Driver for the Atmel USBA high speed USB device controller
   3  *
   4  * Copyright (C) 2005-2007 Atmel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/clk.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/io.h>
  15 #include <linux/device.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/list.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/usb/ch9.h>
  20 #include <linux/usb/gadget.h>
  21 #include <linux/delay.h>
  22
  23 #include <asm/gpio.h>
  24 #include <asm/arch/board.h>
  25
  26 #include "atmel_usba_udc.h"
  27
  28
  29 static struct usba_udc the_udc;
  30
  31 #ifdef CONFIG_USB_GADGET_DEBUG_FS
  32 #include <linux/debugfs.h>
  33 #include <linux/uaccess.h>
  34
  35 static int queue_dbg_open(struct inode *inode, struct file *file)
  36 {
  37         struct usba_ep *ep = inode->i_private;
  38         struct usba_request *req, *req_copy;
  39         struct list_head *queue_data;
  40
  41         queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
  42         if (!queue_data)
  43                 return -ENOMEM;
  44         INIT_LIST_HEAD(queue_data);
  45
  46         spin_lock_irq(&ep->udc->lock);
  47         list_for_each_entry(req, &ep->queue, queue) {
  48                 req_copy = kmalloc(sizeof(*req_copy), GFP_ATOMIC);
  49                 if (!req_copy)
  50                         goto fail;
  51                 memcpy(req_copy, req, sizeof(*req_copy));
  52                 list_add_tail(&req_copy->queue, queue_data);
  53         }
  54         spin_unlock_irq(&ep->udc->lock);
  55
  56         file->private_data = queue_data;
  57         return 0;
  58
  59 fail:
  60         spin_unlock_irq(&ep->udc->lock);
  61         list_for_each_entry_safe(req, req_copy, queue_data, queue) {
  62                 list_del(&req->queue);
  63                 kfree(req);
  64         }
  65         kfree(queue_data);
  66         return -ENOMEM;
  67 }
  68
  69 /*
  70  * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
  71  *
  72  * b: buffer address
  73  * l: buffer length
  74  * I/i: interrupt/no interrupt
  75  * Z/z: zero/no zero
  76  * S/s: short ok/short not ok
  77  * s: status
  78  * n: nr_packets
  79  * F/f: submitted/not submitted to FIFO
  80  * D/d: using/not using DMA
  81  * L/l: last transaction/not last transaction
  82  */
  83 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
  84                 size_t nbytes, loff_t *ppos)
  85 {
  86         struct list_head *queue = file->private_data;
  87         struct usba_request *req, *tmp_req;
  88         size_t len, remaining, actual = 0;
  89         char tmpbuf[38];
  90
  91         if (!access_ok(VERIFY_WRITE, buf, nbytes))
  92                 return -EFAULT;
  93
  94         mutex_lock(&file->f_dentry->d_inode->i_mutex);
  95         list_for_each_entry_safe(req, tmp_req, queue, queue) {
  96                 len = snprintf(tmpbuf, sizeof(tmpbuf),
  97                                 "%8p %08x %c%c%c %5d %c%c%c\n",
  98                                 req->req.buf, req->req.length,
  99                                 req->req.no_interrupt ? 'i' : 'I',
 100                                 req->req.zero ? 'Z' : 'z',
 101                                 req->req.short_not_ok ? 's' : 'S',
 102                                 req->req.status,
 103                                 req->submitted ? 'F' : 'f',
 104                                 req->using_dma ? 'D' : 'd',
 105                                 req->last_transaction ? 'L' : 'l');
 106                 len = min(len, sizeof(tmpbuf));
 107                 if (len > nbytes)
 108                         break;
 109
 110                 list_del(&req->queue);
 111                 kfree(req);
 112
 113                 remaining = __copy_to_user(buf, tmpbuf, len);
 114                 actual += len - remaining;
 115                 if (remaining)
 116                         break;
 117
 118                 nbytes -= len;
 119                 buf += len;
 120         }
 121         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 122
 123         return actual;
 124 }
 125
 126 static int queue_dbg_release(struct inode *inode, struct file *file)
 127 {
 128         struct list_head *queue_data = file->private_data;
 129         struct usba_request *req, *tmp_req;
 130
 131         list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
 132                 list_del(&req->queue);
 133                 kfree(req);
 134         }
 135         kfree(queue_data);
 136         return 0;
 137 }
 138
 139 static int regs_dbg_open(struct inode *inode, struct file *file)
 140 {
 141         struct usba_udc *udc;
 142         unsigned int i;
 143         u32 *data;
 144         int ret = -ENOMEM;
 145
 146         mutex_lock(&inode->i_mutex);
 147         udc = inode->i_private;
 148         data = kmalloc(inode->i_size, GFP_KERNEL);
 149         if (!data)
 150                 goto out;
 151
 152         spin_lock_irq(&udc->lock);
 153         for (i = 0; i < inode->i_size / 4; i++)
 154                 data[i] = __raw_readl(udc->regs + i * 4);
 155         spin_unlock_irq(&udc->lock);
 156
 157         file->private_data = data;
 158         ret = 0;
 159
 160 out:
 161         mutex_unlock(&inode->i_mutex);
 162
 163         return ret;
 164 }
 165
 166 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
 167                 size_t nbytes, loff_t *ppos)
 168 {
 169         struct inode *inode = file->f_dentry->d_inode;
 170         int ret;
 171
 172         mutex_lock(&inode->i_mutex);
 173         ret = simple_read_from_buffer(buf, nbytes, ppos,
 174                         file->private_data,
 175                         file->f_dentry->d_inode->i_size);
 176         mutex_unlock(&inode->i_mutex);
 177
 178         return ret;
 179 }
 180
 181 static int regs_dbg_release(struct inode *inode, struct file *file)
 182 {
 183         kfree(file->private_data);
 184         return 0;
 185 }
 186
 187 const struct file_operations queue_dbg_fops = {
 188         .owner          = THIS_MODULE,
 189         .open           = queue_dbg_open,
 190         .llseek         = no_llseek,
 191         .read           = queue_dbg_read,
 192         .release        = queue_dbg_release,
 193 };
 194
 195 const struct file_operations regs_dbg_fops = {
 196         .owner          = THIS_MODULE,
 197         .open           = regs_dbg_open,
 198         .llseek         = generic_file_llseek,
 199         .read           = regs_dbg_read,
 200         .release        = regs_dbg_release,
 201 };
 202
 203 static void usba_ep_init_debugfs(struct usba_udc *udc,
 204                 struct usba_ep *ep)
 205 {
 206         struct dentry *ep_root;
 207
 208         ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
 209         if (!ep_root)
 210                 goto err_root;
 211         ep->debugfs_dir = ep_root;
 212
 213         ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
 214                                                 ep, &queue_dbg_fops);
 215         if (!ep->debugfs_queue)
 216                 goto err_queue;
 217
 218         if (ep->can_dma) {
 219                 ep->debugfs_dma_status
 220                         = debugfs_create_u32("dma_status", 0400, ep_root,
 221                                         &ep->last_dma_status);
 222                 if (!ep->debugfs_dma_status)
 223                         goto err_dma_status;
 224         }
 225         if (ep_is_control(ep)) {
 226                 ep->debugfs_state
 227                         = debugfs_create_u32("state", 0400, ep_root,
 228                                         &ep->state);
 229                 if (!ep->debugfs_state)
 230                         goto err_state;
 231         }
 232
 233         return;
 234
 235 err_state:
 236         if (ep->can_dma)
 237                 debugfs_remove(ep->debugfs_dma_status);
 238 err_dma_status:
 239         debugfs_remove(ep->debugfs_queue);
 240 err_queue:
 241         debugfs_remove(ep_root);
 242 err_root:
 243         dev_err(&ep->udc->pdev->dev,
 244                 "failed to create debugfs directory for %s\n", ep->ep.name);
 245 }
 246
 247 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 248 {
 249         debugfs_remove(ep->debugfs_queue);
 250         debugfs_remove(ep->debugfs_dma_status);
 251         debugfs_remove(ep->debugfs_state);
 252         debugfs_remove(ep->debugfs_dir);
 253         ep->debugfs_dma_status = NULL;
 254         ep->debugfs_dir = NULL;
 255 }
 256
 257 static void usba_init_debugfs(struct usba_udc *udc)
 258 {
 259         struct dentry *root, *regs;
 260         struct resource *regs_resource;
 261
 262         root = debugfs_create_dir(udc->gadget.name, NULL);
 263         if (IS_ERR(root) || !root)
 264                 goto err_root;
 265         udc->debugfs_root = root;
 266
 267         regs = debugfs_create_file("regs", 0400, root, udc, &regs_dbg_fops);
 268         if (!regs)
 269                 goto err_regs;
 270
 271         regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
 272                                 CTRL_IOMEM_ID);
 273         regs->d_inode->i_size = regs_resource->end - regs_resource->start + 1;
 274         udc->debugfs_regs = regs;
 275
 276         usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
 277
 278         return;
 279
 280 err_regs:
 281         debugfs_remove(root);
 282 err_root:
 283         udc->debugfs_root = NULL;
 284         dev_err(&udc->pdev->dev, "debugfs is not available\n");
 285 }
 286
 287 static void usba_cleanup_debugfs(struct usba_udc *udc)
 288 {
 289         usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
 290         debugfs_remove(udc->debugfs_regs);
 291         debugfs_remove(udc->debugfs_root);
 292         udc->debugfs_regs = NULL;
 293         udc->debugfs_root = NULL;
 294 }
 295 #else
 296 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
 297                                          struct usba_ep *ep)
 298 {
 299
 300 }
 301
 302 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 303 {
 304
 305 }
 306
 307 static inline void usba_init_debugfs(struct usba_udc *udc)
 308 {
 309
 310 }
 311
 312 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
 313 {
 314
 315 }
 316 #endif
 317
 318 static int vbus_is_present(struct usba_udc *udc)
 319 {
 320         if (udc->vbus_pin != -1)
 321                 return gpio_get_value(udc->vbus_pin);
 322
 323         /* No Vbus detection: Assume always present */
 324         return 1;
 325 }
 326
 327 static void copy_to_fifo(void __iomem *fifo, const void *buf, int len)
 328 {
 329         unsigned long tmp;
 330
 331         DBG(DBG_FIFO, "copy to FIFO (len %d):\n", len);
 332         for (; len > 0; len -= 4, buf += 4, fifo += 4) {
 333                 tmp = *(unsigned long *)buf;
 334                 if (len >= 4) {
 335                         DBG(DBG_FIFO, "  -> %08lx\n", tmp);
 336                         __raw_writel(tmp, fifo);
 337                 } else {
 338                         do {
 339                                 DBG(DBG_FIFO, "  -> %02lx\n", tmp >> 24);
 340                                 __raw_writeb(tmp >> 24, fifo);
 341                                 fifo++;
 342                                 tmp <<= 8;
 343                         } while (--len);
 344                         break;
 345                 }
 346         }
 347 }
 348
 349 static void copy_from_fifo(void *buf, void __iomem *fifo, int len)
 350 {
 351         union {
 352                 unsigned long *w;
 353                 unsigned char *b;
 354         } p;
 355         unsigned long tmp;
 356
 357         DBG(DBG_FIFO, "copy from FIFO (len %d):\n", len);
 358         for (p.w = buf; len > 0; len -= 4, p.w++, fifo += 4) {
 359                 if (len >= 4) {
 360                         tmp = __raw_readl(fifo);
 361                         *p.w = tmp;
 362                         DBG(DBG_FIFO, "  -> %08lx\n", tmp);
 363                 } else {
 364                         do {
 365                                 tmp = __raw_readb(fifo);
 366                                 *p.b = tmp;
 367                                 DBG(DBG_FIFO, " -> %02lx\n", tmp);
 368                                 fifo++, p.b++;
 369                         } while (--len);
 370                 }
 371         }
 372 }
 373
 374 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 375 {
 376         unsigned int transaction_len;
 377
 378         transaction_len = req->req.length - req->req.actual;
 379         req->last_transaction = 1;
 380         if (transaction_len > ep->ep.maxpacket) {
 381                 transaction_len = ep->ep.maxpacket;
 382                 req->last_transaction = 0;
 383         } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
 384                 req->last_transaction = 0;
 385
 386         DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
 387                 ep->ep.name, req, transaction_len,
 388                 req->last_transaction ? ", done" : "");
 389
 390         copy_to_fifo(ep->fifo, req->req.buf + req->req.actual, transaction_len);
 391         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 392         req->req.actual += transaction_len;
 393 }
 394
 395 static void submit_request(struct usba_ep *ep, struct usba_request *req)
 396 {
 397         DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
 398                 ep->ep.name, req, req->req.length);
 399
 400         req->req.actual = 0;
 401         req->submitted = 1;
 402
 403         if (req->using_dma) {
 404                 if (req->req.length == 0) {
 405                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 406                         return;
 407                 }
 408
 409                 if (req->req.zero)
 410                         usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
 411                 else
 412                         usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
 413
 414                 usba_dma_writel(ep, ADDRESS, req->req.dma);
 415                 usba_dma_writel(ep, CONTROL, req->ctrl);
 416         } else {
 417                 next_fifo_transaction(ep, req);
 418                 if (req->last_transaction) {
 419                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
 420                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 421                 } else {
 422                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
 423                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 424                 }
 425         }
 426 }
 427
 428 static void submit_next_request(struct usba_ep *ep)
 429 {
 430         struct usba_request *req;
 431
 432         if (list_empty(&ep->queue)) {
 433                 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
 434                 return;
 435         }
 436
 437         req = list_entry(ep->queue.next, struct usba_request, queue);
 438         if (!req->submitted)
 439                 submit_request(ep, req);
 440 }
 441
 442 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
 443 {
 444         ep->state = STATUS_STAGE_IN;
 445         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 446         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 447 }
 448
 449 static void receive_data(struct usba_ep *ep)
 450 {
 451         struct usba_udc *udc = ep->udc;
 452         struct usba_request *req;
 453         unsigned long status;
 454         unsigned int bytecount, nr_busy;
 455         int is_complete = 0;
 456
 457         status = usba_ep_readl(ep, STA);
 458         nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 459
 460         DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
 461
 462         while (nr_busy > 0) {
 463                 if (list_empty(&ep->queue)) {
 464                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 465                         break;
 466                 }
 467                 req = list_entry(ep->queue.next,
 468                                  struct usba_request, queue);
 469
 470                 bytecount = USBA_BFEXT(BYTE_COUNT, status);
 471
 472                 if (status & (1 << 31))
 473                         is_complete = 1;
 474                 if (req->req.actual + bytecount >= req->req.length) {
 475                         is_complete = 1;
 476                         bytecount = req->req.length - req->req.actual;
 477                 }
 478
 479                 copy_from_fifo(req->req.buf + req->req.actual,
 480                                 ep->fifo, bytecount);
 481                 req->req.actual += bytecount;
 482
 483                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
 484
 485                 if (is_complete) {
 486                         DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
 487                         req->req.status = 0;
 488                         list_del_init(&req->queue);
 489                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 490                         spin_unlock(&udc->lock);
 491                         req->req.complete(&ep->ep, &req->req);
 492                         spin_lock(&udc->lock);
 493                 }
 494
 495                 status = usba_ep_readl(ep, STA);
 496                 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 497
 498                 if (is_complete && ep_is_control(ep)) {
 499                         send_status(udc, ep);
 500                         break;
 501                 }
 502         }
 503 }
 504
 505 static void
 506 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
 507 {
 508         struct usba_udc *udc = ep->udc;
 509
 510         WARN_ON(!list_empty(&req->queue));
 511
 512         if (req->req.status == -EINPROGRESS)
 513                 req->req.status = status;
 514
 515         if (req->mapped) {
 516                 dma_unmap_single(
 517                         &udc->pdev->dev, req->req.dma, req->req.length,
 518                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 519                 req->req.dma = DMA_ADDR_INVALID;
 520                 req->mapped = 0;
 521         }
 522
 523         DBG(DBG_GADGET | DBG_REQ,
 524                 "%s: req %p complete: status %d, actual %u\n",
 525                 ep->ep.name, req, req->req.status, req->req.actual);
 526
 527         spin_unlock(&udc->lock);
 528         req->req.complete(&ep->ep, &req->req);
 529         spin_lock(&udc->lock);
 530 }
 531
 532 static void
 533 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
 534 {
 535         struct usba_request *req, *tmp_req;
 536
 537         list_for_each_entry_safe(req, tmp_req, list, queue) {
 538                 list_del_init(&req->queue);
 539                 request_complete(ep, req, status);
 540         }
 541 }
 542
 543 static int
 544 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 545 {
 546         struct usba_ep *ep = to_usba_ep(_ep);
 547         struct usba_udc *udc = ep->udc;
 548         unsigned long flags, ept_cfg, maxpacket;
 549         unsigned int nr_trans;
 550
 551         DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
 552
 553         maxpacket = le16_to_cpu(desc->wMaxPacketSize) & 0x7ff;
 554
 555         if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
 556                         || ep->index == 0
 557                         || desc->bDescriptorType != USB_DT_ENDPOINT
 558                         || maxpacket == 0
 559                         || maxpacket > ep->fifo_size) {
 560                 DBG(DBG_ERR, "ep_enable: Invalid argument");
 561                 return -EINVAL;
 562         }
 563
 564         ep->is_isoc = 0;
 565         ep->is_in = 0;
 566
 567         if (maxpacket <= 8)
 568                 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
 569         else
 570                 /* LSB is bit 1, not 0 */
 571                 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
 572
 573         DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
 574                         ep->ep.name, ept_cfg, maxpacket);
 575
 576         if ((desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
 577                 ep->is_in = 1;
 578                 ept_cfg |= USBA_EPT_DIR_IN;
 579         }
 580
 581         switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 582         case USB_ENDPOINT_XFER_CONTROL:
 583                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 584                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
 585                 break;
 586         case USB_ENDPOINT_XFER_ISOC:
 587                 if (!ep->can_isoc) {
 588                         DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
 589                                         ep->ep.name);
 590                         return -EINVAL;
 591                 }
 592
 593                 /*
 594                  * Bits 11:12 specify number of _additional_
 595                  * transactions per microframe.
 596                  */
 597                 nr_trans = ((le16_to_cpu(desc->wMaxPacketSize) >> 11) & 3) + 1;
 598                 if (nr_trans > 3)
 599                         return -EINVAL;
 600
 601                 ep->is_isoc = 1;
 602                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 603
 604                 /*
 605                  * Do triple-buffering on high-bandwidth iso endpoints.
 606                  */
 607                 if (nr_trans > 1 && ep->nr_banks == 3)
 608                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
 609                 else
 610                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 611                 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 612                 break;
 613         case USB_ENDPOINT_XFER_BULK:
 614                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 615                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 616                 break;
 617         case USB_ENDPOINT_XFER_INT:
 618                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 619                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 620                 break;
 621         }
 622
 623         spin_lock_irqsave(&ep->udc->lock, flags);
 624
 625         if (ep->desc) {
 626                 spin_unlock_irqrestore(&ep->udc->lock, flags);
 627                 DBG(DBG_ERR, "ep%d already enabled\n", ep->index);
 628                 return -EBUSY;
 629         }
 630
 631         ep->desc = desc;
 632         ep->ep.maxpacket = maxpacket;
 633
 634         usba_ep_writel(ep, CFG, ept_cfg);
 635         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 636
 637         if (ep->can_dma) {
 638                 u32 ctrl;
 639
 640                 usba_writel(udc, INT_ENB,
 641                                 (usba_readl(udc, INT_ENB)
 642                                         | USBA_BF(EPT_INT, 1 << ep->index)
 643                                         | USBA_BF(DMA_INT, 1 << ep->index)));
 644                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 645                 usba_ep_writel(ep, CTL_ENB, ctrl);
 646         } else {
 647                 usba_writel(udc, INT_ENB,
 648                                 (usba_readl(udc, INT_ENB)
 649                                         | USBA_BF(EPT_INT, 1 << ep->index)));
 650         }
 651
 652         spin_unlock_irqrestore(&udc->lock, flags);
 653
 654         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 655                         (unsigned long)usba_ep_readl(ep, CFG));
 656         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 657                         (unsigned long)usba_readl(udc, INT_ENB));
 658
 659         return 0;
 660 }
 661
 662 static int usba_ep_disable(struct usb_ep *_ep)
 663 {
 664         struct usba_ep *ep = to_usba_ep(_ep);
 665         struct usba_udc *udc = ep->udc;
 666         LIST_HEAD(req_list);
 667         unsigned long flags;
 668
 669         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 670
 671         spin_lock_irqsave(&udc->lock, flags);
 672
 673         if (!ep->desc) {
 674                 spin_unlock_irqrestore(&udc->lock, flags);
 675                 DBG(DBG_ERR, "ep_disable: %s not enabled\n", ep->ep.name);
 676                 return -EINVAL;
 677         }
 678         ep->desc = NULL;
 679
 680         list_splice_init(&ep->queue, &req_list);
 681         if (ep->can_dma) {
 682                 usba_dma_writel(ep, CONTROL, 0);
 683                 usba_dma_writel(ep, ADDRESS, 0);
 684                 usba_dma_readl(ep, STATUS);
 685         }
 686         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 687         usba_writel(udc, INT_ENB,
 688                         usba_readl(udc, INT_ENB)
 689                         & ~USBA_BF(EPT_INT, 1 << ep->index));
 690
 691         request_complete_list(ep, &req_list, -ESHUTDOWN);
 692
 693         spin_unlock_irqrestore(&udc->lock, flags);
 694
 695         return 0;
 696 }
 697
 698 static struct usb_request *
 699 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 700 {
 701         struct usba_request *req;
 702
 703         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 704
 705         req = kzalloc(sizeof(*req), gfp_flags);
 706         if (!req)
 707                 return NULL;
 708
 709         INIT_LIST_HEAD(&req->queue);
 710         req->req.dma = DMA_ADDR_INVALID;
 711
 712         return &req->req;
 713 }
 714
 715 static void
 716 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 717 {
 718         struct usba_request *req = to_usba_req(_req);
 719
 720         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 721
 722         kfree(req);
 723 }
 724
 725 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 726                 struct usba_request *req, gfp_t gfp_flags)
 727 {
 728         unsigned long flags;
 729         int ret;
 730
 731         DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
 732                 ep->ep.name, req->req.length, req->req.dma,
 733                 req->req.zero ? 'Z' : 'z',
 734                 req->req.short_not_ok ? 'S' : 's',
 735                 req->req.no_interrupt ? 'I' : 'i');
 736
 737         if (req->req.length > 0x10000) {
 738                 /* Lengths from 0 to 65536 (inclusive) are supported */
 739                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 740                 return -EINVAL;
 741         }
 742
 743         req->using_dma = 1;
 744
 745         if (req->req.dma == DMA_ADDR_INVALID) {
 746                 req->req.dma = dma_map_single(
 747                         &udc->pdev->dev, req->req.buf, req->req.length,
 748                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 749                 req->mapped = 1;
 750         } else {
 751                 dma_sync_single_for_device(
 752                         &udc->pdev->dev, req->req.dma, req->req.length,
 753                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 754                 req->mapped = 0;
 755         }
 756
 757         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 758                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 759                         | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 760
 761         if (ep->is_in)
 762                 req->ctrl |= USBA_DMA_END_BUF_EN;
 763
 764         /*
 765          * Add this request to the queue and submit for DMA if
 766          * possible. Check if we're still alive first -- we may have
 767          * received a reset since last time we checked.
 768          */
 769         ret = -ESHUTDOWN;
 770         spin_lock_irqsave(&udc->lock, flags);
 771         if (ep->desc) {
 772                 if (list_empty(&ep->queue))
 773                         submit_request(ep, req);
 774
 775                 list_add_tail(&req->queue, &ep->queue);
 776                 ret = 0;
 777         }
 778         spin_unlock_irqrestore(&udc->lock, flags);
 779
 780         return ret;
 781 }
 782
 783 static int
 784 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 785 {
 786         struct usba_request *req = to_usba_req(_req);
 787         struct usba_ep *ep = to_usba_ep(_ep);
 788         struct usba_udc *udc = ep->udc;
 789         unsigned long flags;
 790         int ret;
 791
 792         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 793                         ep->ep.name, req, _req->length);
 794
 795         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN || !ep->desc)
 796                 return -ESHUTDOWN;
 797
 798         req->submitted = 0;
 799         req->using_dma = 0;
 800         req->last_transaction = 0;
 801
 802         _req->status = -EINPROGRESS;
 803         _req->actual = 0;
 804
 805         if (ep->can_dma)
 806                 return queue_dma(udc, ep, req, gfp_flags);
 807
 808         /* May have received a reset since last time we checked */
 809         ret = -ESHUTDOWN;
 810         spin_lock_irqsave(&udc->lock, flags);
 811         if (ep->desc) {
 812                 list_add_tail(&req->queue, &ep->queue);
 813
 814                 if (ep->is_in || (ep_is_control(ep)
 815                                 && (ep->state == DATA_STAGE_IN
 816                                         || ep->state == STATUS_STAGE_IN)))
 817                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 818                 else
 819                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 820                 ret = 0;
 821         }
 822         spin_unlock_irqrestore(&udc->lock, flags);
 823
 824         return ret;
 825 }
 826
 827 static void
 828 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 829 {
 830         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 831 }
 832
 833 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 834 {
 835         unsigned int timeout;
 836         u32 status;
 837
 838         /*
 839          * Stop the DMA controller. When writing both CH_EN
 840          * and LINK to 0, the other bits are not affected.
 841          */
 842         usba_dma_writel(ep, CONTROL, 0);
 843
 844         /* Wait for the FIFO to empty */
 845         for (timeout = 40; timeout; --timeout) {
 846                 status = usba_dma_readl(ep, STATUS);
 847                 if (!(status & USBA_DMA_CH_EN))
 848                         break;
 849                 udelay(1);
 850         }
 851
 852         if (pstatus)
 853                 *pstatus = status;
 854
 855         if (timeout == 0) {
 856                 dev_err(&ep->udc->pdev->dev,
 857                         "%s: timed out waiting for DMA FIFO to empty\n",
 858                         ep->ep.name);
 859                 return -ETIMEDOUT;
 860         }
 861
 862         return 0;
 863 }
 864
 865 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 866 {
 867         struct usba_ep *ep = to_usba_ep(_ep);
 868         struct usba_udc *udc = ep->udc;
 869         struct usba_request *req = to_usba_req(_req);
 870         unsigned long flags;
 871         u32 status;
 872
 873         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 874                         ep->ep.name, req);
 875
 876         spin_lock_irqsave(&udc->lock, flags);
 877
 878         if (req->using_dma) {
 879                 /*
 880                  * If this request is currently being transferred,
 881                  * stop the DMA controller and reset the FIFO.
 882                  */
 883                 if (ep->queue.next == &req->queue) {
 884                         status = usba_dma_readl(ep, STATUS);
 885                         if (status & USBA_DMA_CH_EN)
 886                                 stop_dma(ep, &status);
 887
 888 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 889                         ep->last_dma_status = status;
 890 #endif
 891
 892                         usba_writel(udc, EPT_RST, 1 << ep->index);
 893
 894                         usba_update_req(ep, req, status);
 895                 }
 896         }
 897
 898         /*
 899          * Errors should stop the queue from advancing until the
 900          * completion function returns.
 901          */
 902         list_del_init(&req->queue);
 903
 904         request_complete(ep, req, -ECONNRESET);
 905
 906         /* Process the next request if any */
 907         submit_next_request(ep);
 908         spin_unlock_irqrestore(&udc->lock, flags);
 909
 910         return 0;
 911 }
 912
 913 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 914 {
 915         struct usba_ep *ep = to_usba_ep(_ep);
 916         struct usba_udc *udc = ep->udc;
 917         unsigned long flags;
 918         int ret = 0;
 919
 920         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 921                         value ? "set" : "clear");
 922
 923         if (!ep->desc) {
 924                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 925                                 ep->ep.name);
 926                 return -ENODEV;
 927         }
 928         if (ep->is_isoc) {
 929                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 930                                 ep->ep.name);
 931                 return -ENOTTY;
 932         }
 933
 934         spin_lock_irqsave(&udc->lock, flags);
 935
 936         /*
 937          * We can't halt IN endpoints while there are still data to be
 938          * transferred
 939          */
 940         if (!list_empty(&ep->queue)
 941                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 942                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 943                 ret = -EAGAIN;
 944         } else {
 945                 if (value)
 946                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 947                 else
 948                         usba_ep_writel(ep, CLR_STA,
 949                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 950                 usba_ep_readl(ep, STA);
 951         }
 952
 953         spin_unlock_irqrestore(&udc->lock, flags);
 954
 955         return ret;
 956 }
 957
 958 static int usba_ep_fifo_status(struct usb_ep *_ep)
 959 {
 960         struct usba_ep *ep = to_usba_ep(_ep);
 961
 962         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 963 }
 964
 965 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 966 {
 967         struct usba_ep *ep = to_usba_ep(_ep);
 968         struct usba_udc *udc = ep->udc;
 969
 970         usba_writel(udc, EPT_RST, 1 << ep->index);
 971 }
 972
 973 static const struct usb_ep_ops usba_ep_ops = {
 974         .enable         = usba_ep_enable,
 975         .disable        = usba_ep_disable,
 976         .alloc_request  = usba_ep_alloc_request,
 977         .free_request   = usba_ep_free_request,
 978         .queue          = usba_ep_queue,
 979         .dequeue        = usba_ep_dequeue,
 980         .set_halt       = usba_ep_set_halt,
 981         .fifo_status    = usba_ep_fifo_status,
 982         .fifo_flush     = usba_ep_fifo_flush,
 983 };
 984
 985 static int usba_udc_get_frame(struct usb_gadget *gadget)
 986 {
 987         struct usba_udc *udc = to_usba_udc(gadget);
 988
 989         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 990 }
 991
 992 static int usba_udc_wakeup(struct usb_gadget *gadget)
 993 {
 994         struct usba_udc *udc = to_usba_udc(gadget);
 995         unsigned long flags;
 996         u32 ctrl;
 997         int ret = -EINVAL;
 998
 999         spin_lock_irqsave(&udc->lock, flags);
1000         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1001                 ctrl = usba_readl(udc, CTRL);
1002                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
1003                 ret = 0;
1004         }
1005         spin_unlock_irqrestore(&udc->lock, flags);
1006
1007         return ret;
1008 }
1009
1010 static int
1011 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
1012 {
1013         struct usba_udc *udc = to_usba_udc(gadget);
1014         unsigned long flags;
1015
1016         spin_lock_irqsave(&udc->lock, flags);
1017         if (is_selfpowered)
1018                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1019         else
1020                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1021         spin_unlock_irqrestore(&udc->lock, flags);
1022
1023         return 0;
1024 }
1025
1026 static const struct usb_gadget_ops usba_udc_ops = {
1027         .get_frame              = usba_udc_get_frame,
1028         .wakeup                 = usba_udc_wakeup,
1029         .set_selfpowered        = usba_udc_set_selfpowered,
1030 };
1031
1032 #define EP(nam, idx, maxpkt, maxbk, dma, isoc)                  \
1033 {                                                               \
1034         .ep     = {                                             \
1035                 .ops            = &usba_ep_ops,                 \
1036                 .name           = nam,                          \
1037                 .maxpacket      = maxpkt,                       \
1038         },                                                      \
1039         .udc            = &the_udc,                             \
1040         .queue          = LIST_HEAD_INIT(usba_ep[idx].queue),   \
1041         .fifo_size      = maxpkt,                               \
1042         .nr_banks       = maxbk,                                \
1043         .index          = idx,                                  \
1044         .can_dma        = dma,                                  \
1045         .can_isoc       = isoc,                                 \
1046 }
1047
1048 static struct usba_ep usba_ep[] = {
1049         EP("ep0", 0, 64, 1, 0, 0),
1050         EP("ep1in-bulk", 1, 512, 2, 1, 1),
1051         EP("ep2out-bulk", 2, 512, 2, 1, 1),
1052         EP("ep3in-int", 3, 64, 3, 1, 0),
1053         EP("ep4out-int", 4, 64, 3, 1, 0),
1054         EP("ep5in-iso", 5, 1024, 3, 1, 1),
1055         EP("ep6out-iso", 6, 1024, 3, 1, 1),
1056 };
1057 #undef EP
1058
1059 static struct usb_endpoint_descriptor usba_ep0_desc = {
1060         .bLength = USB_DT_ENDPOINT_SIZE,
1061         .bDescriptorType = USB_DT_ENDPOINT,
1062         .bEndpointAddress = 0,
1063         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1064         .wMaxPacketSize = __constant_cpu_to_le16(64),
1065         /* FIXME: I have no idea what to put here */
1066         .bInterval = 1,
1067 };
1068
1069 static void nop_release(struct device *dev)
1070 {
1071
1072 }
1073
1074 static struct usba_udc the_udc = {
1075         .gadget = {
1076                 .ops            = &usba_udc_ops,
1077                 .ep0            = &usba_ep[0].ep,
1078                 .ep_list        = LIST_HEAD_INIT(the_udc.gadget.ep_list),
1079                 .is_dualspeed   = 1,
1080                 .name           = "atmel_usba_udc",
1081                 .dev    = {
1082                         .bus_id         = "gadget",
1083                         .release        = nop_release,
1084                 },
1085         },
1086
1087         .lock   = SPIN_LOCK_UNLOCKED,
1088 };
1089
1090 /*
1091  * Called with interrupts disabled and udc->lock held.
1092  */
1093 static void reset_all_endpoints(struct usba_udc *udc)
1094 {
1095         struct usba_ep *ep;
1096         struct usba_request *req, *tmp_req;
1097
1098         usba_writel(udc, EPT_RST, ~0UL);
1099
1100         ep = to_usba_ep(udc->gadget.ep0);
1101         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1102                 list_del_init(&req->queue);
1103                 request_complete(ep, req, -ECONNRESET);
1104         }
1105
1106         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1107                 if (ep->desc) {
1108                         spin_unlock(&udc->lock);
1109                         usba_ep_disable(&ep->ep);
1110                         spin_lock(&udc->lock);
1111                 }
1112         }
1113 }
1114
1115 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1116 {
1117         struct usba_ep *ep;
1118
1119         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1120                 return to_usba_ep(udc->gadget.ep0);
1121
1122         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1123                 u8 bEndpointAddress;
1124
1125                 if (!ep->desc)
1126                         continue;
1127                 bEndpointAddress = ep->desc->bEndpointAddress;
1128                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1129                         continue;
1130                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1131                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1132                         return ep;
1133         }
1134
1135         return NULL;
1136 }
1137
1138 /* Called with interrupts disabled and udc->lock held */
1139 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1140 {
1141         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1142         ep->state = WAIT_FOR_SETUP;
1143 }
1144
1145 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1146 {
1147         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1148                 return 1;
1149         return 0;
1150 }
1151
1152 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1153 {
1154         u32 regval;
1155
1156         DBG(DBG_BUS, "setting address %u...\n", addr);
1157         regval = usba_readl(udc, CTRL);
1158         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1159         usba_writel(udc, CTRL, regval);
1160 }
1161
1162 static int do_test_mode(struct usba_udc *udc)
1163 {
1164         static const char test_packet_buffer[] = {
1165                 /* JKJKJKJK * 9 */
1166                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1167                 /* JJKKJJKK * 8 */
1168                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1169                 /* JJKKJJKK * 8 */
1170                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1171                 /* JJJJJJJKKKKKKK * 8 */
1172                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1173                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1174                 /* JJJJJJJK * 8 */
1175                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1176                 /* {JKKKKKKK * 10}, JK */
1177                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1178         };
1179         struct usba_ep *ep;
1180         struct device *dev = &udc->pdev->dev;
1181         int test_mode;
1182
1183         test_mode = udc->test_mode;
1184
1185         /* Start from a clean slate */
1186         reset_all_endpoints(udc);
1187
1188         switch (test_mode) {
1189         case 0x0100:
1190                 /* Test_J */
1191                 usba_writel(udc, TST, USBA_TST_J_MODE);
1192                 dev_info(dev, "Entering Test_J mode...\n");
1193                 break;
1194         case 0x0200:
1195                 /* Test_K */
1196                 usba_writel(udc, TST, USBA_TST_K_MODE);
1197                 dev_info(dev, "Entering Test_K mode...\n");
1198                 break;
1199         case 0x0300:
1200                 /*
1201                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1202                  * for Bulk IN transfers
1203                  */
1204                 ep = &usba_ep[0];
1205                 usba_writel(udc, TST,
1206                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1207                 usba_ep_writel(ep, CFG,
1208                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1209                                 | USBA_EPT_DIR_IN
1210                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1211                                 | USBA_BF(BK_NUMBER, 1));
1212                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1213                         set_protocol_stall(udc, ep);
1214                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1215                 } else {
1216                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1217                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1218                 }
1219                 break;
1220         case 0x0400:
1221                 /* Test_Packet */
1222                 ep = &usba_ep[0];
1223                 usba_ep_writel(ep, CFG,
1224                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1225                                 | USBA_EPT_DIR_IN
1226                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1227                                 | USBA_BF(BK_NUMBER, 1));
1228                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1229                         set_protocol_stall(udc, ep);
1230                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1231                 } else {
1232                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1233                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1234                         copy_to_fifo(ep->fifo, test_packet_buffer,
1235                                         sizeof(test_packet_buffer));
1236                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1237                         dev_info(dev, "Entering Test_Packet mode...\n");
1238                 }
1239                 break;
1240         default:
1241                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1242                 return -EINVAL;
1243         }
1244
1245         return 0;
1246 }
1247
1248 /* Avoid overly long expressions */
1249 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1250 {
1251         if (crq->wValue == __constant_cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1252                 return true;
1253         return false;
1254 }
1255
1256 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1257 {
1258         if (crq->wValue == __constant_cpu_to_le16(USB_DEVICE_TEST_MODE))
1259                 return true;
1260         return false;
1261 }
1262
1263 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1264 {
1265         if (crq->wValue == __constant_cpu_to_le16(USB_ENDPOINT_HALT))
1266                 return true;
1267         return false;
1268 }
1269
1270 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1271                 struct usb_ctrlrequest *crq)
1272 {
1273         int retval = 0;;
1274
1275         switch (crq->bRequest) {
1276         case USB_REQ_GET_STATUS: {
1277                 u16 status;
1278
1279                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1280                         status = cpu_to_le16(udc->devstatus);
1281                 } else if (crq->bRequestType
1282                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1283                         status = __constant_cpu_to_le16(0);
1284                 } else if (crq->bRequestType
1285                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1286                         struct usba_ep *target;
1287
1288                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1289                         if (!target)
1290                                 goto stall;
1291
1292                         status = 0;
1293                         if (is_stalled(udc, target))
1294                                 status |= __constant_cpu_to_le16(1);
1295                 } else
1296                         goto delegate;
1297
1298                 /* Write directly to the FIFO. No queueing is done. */
1299                 if (crq->wLength != __constant_cpu_to_le16(sizeof(status)))
1300                         goto stall;
1301                 ep->state = DATA_STAGE_IN;
1302                 __raw_writew(status, ep->fifo);
1303                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1304                 break;
1305         }
1306
1307         case USB_REQ_CLEAR_FEATURE: {
1308                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1309                         if (feature_is_dev_remote_wakeup(crq))
1310                                 udc->devstatus
1311                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1312                         else
1313                                 /* Can't CLEAR_FEATURE TEST_MODE */
1314                                 goto stall;
1315                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1316                         struct usba_ep *target;
1317
1318                         if (crq->wLength != __constant_cpu_to_le16(0)
1319                                         || !feature_is_ep_halt(crq))
1320                                 goto stall;
1321                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1322                         if (!target)
1323                                 goto stall;
1324
1325                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1326                         if (target->index != 0)
1327                                 usba_ep_writel(target, CLR_STA,
1328                                                 USBA_TOGGLE_CLR);
1329                 } else {
1330                         goto delegate;
1331                 }
1332
1333                 send_status(udc, ep);
1334                 break;
1335         }
1336
1337         case USB_REQ_SET_FEATURE: {
1338                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1339                         if (feature_is_dev_test_mode(crq)) {
1340                                 send_status(udc, ep);
1341                                 ep->state = STATUS_STAGE_TEST;
1342                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1343                                 return 0;
1344                         } else if (feature_is_dev_remote_wakeup(crq)) {
1345                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1346                         } else {
1347                                 goto stall;
1348                         }
1349                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1350                         struct usba_ep *target;
1351
1352                         if (crq->wLength != __constant_cpu_to_le16(0)
1353                                         || !feature_is_ep_halt(crq))
1354                                 goto stall;
1355
1356                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1357                         if (!target)
1358                                 goto stall;
1359
1360                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1361                 } else
1362                         goto delegate;
1363
1364                 send_status(udc, ep);
1365                 break;
1366         }
1367
1368         case USB_REQ_SET_ADDRESS:
1369                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1370                         goto delegate;
1371
1372                 set_address(udc, le16_to_cpu(crq->wValue));
1373                 send_status(udc, ep);
1374                 ep->state = STATUS_STAGE_ADDR;
1375                 break;
1376
1377         default:
1378 delegate:
1379                 spin_unlock(&udc->lock);
1380                 retval = udc->driver->setup(&udc->gadget, crq);
1381                 spin_lock(&udc->lock);
1382         }
1383
1384         return retval;
1385
1386 stall:
1387         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1388                 "halting endpoint...\n",
1389                 ep->ep.name, crq->bRequestType, crq->bRequest,
1390                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1391                 le16_to_cpu(crq->wLength));
1392         set_protocol_stall(udc, ep);
1393         return -1;
1394 }
1395
1396 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1397 {
1398         struct usba_request *req;
1399         u32 epstatus;
1400         u32 epctrl;
1401
1402 restart:
1403         epstatus = usba_ep_readl(ep, STA);
1404         epctrl = usba_ep_readl(ep, CTL);
1405
1406         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1407                         ep->ep.name, ep->state, epstatus, epctrl);
1408
1409         req = NULL;
1410         if (!list_empty(&ep->queue))
1411                 req = list_entry(ep->queue.next,
1412                                  struct usba_request, queue);
1413
1414         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1415                 if (req->submitted)
1416                         next_fifo_transaction(ep, req);
1417                 else
1418                         submit_request(ep, req);
1419
1420                 if (req->last_transaction) {
1421                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1422                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1423                 }
1424                 goto restart;
1425         }
1426         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1427                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1428
1429                 switch (ep->state) {
1430                 case DATA_STAGE_IN:
1431                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1432                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1433                         ep->state = STATUS_STAGE_OUT;
1434                         break;
1435                 case STATUS_STAGE_ADDR:
1436                         /* Activate our new address */
1437                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1438                                                 | USBA_FADDR_EN));
1439                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1440                         ep->state = WAIT_FOR_SETUP;
1441                         break;
1442                 case STATUS_STAGE_IN:
1443                         if (req) {
1444                                 list_del_init(&req->queue);
1445                                 request_complete(ep, req, 0);
1446                                 submit_next_request(ep);
1447                         }
1448                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1449                         ep->state = WAIT_FOR_SETUP;
1450                         break;
1451                 case STATUS_STAGE_TEST:
1452                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1453                         ep->state = WAIT_FOR_SETUP;
1454                         if (do_test_mode(udc))
1455                                 set_protocol_stall(udc, ep);
1456                         break;
1457                 default:
1458                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1459                                 "halting endpoint...\n",
1460                                 ep->ep.name, ep->state);
1461                         set_protocol_stall(udc, ep);
1462                         break;
1463                 }
1464
1465                 goto restart;
1466         }
1467         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1468                 switch (ep->state) {
1469                 case STATUS_STAGE_OUT:
1470                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1471                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1472
1473                         if (req) {
1474                                 list_del_init(&req->queue);
1475                                 request_complete(ep, req, 0);
1476                         }
1477                         ep->state = WAIT_FOR_SETUP;
1478                         break;
1479
1480                 case DATA_STAGE_OUT:
1481                         receive_data(ep);
1482                         break;
1483
1484                 default:
1485                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1486                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1487                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1488                                 "halting endpoint...\n",
1489                                 ep->ep.name, ep->state);
1490                         set_protocol_stall(udc, ep);
1491                         break;
1492                 }
1493
1494                 goto restart;
1495         }
1496         if (epstatus & USBA_RX_SETUP) {
1497                 union {
1498                         struct usb_ctrlrequest crq;
1499                         unsigned long data[2];
1500                 } crq;
1501                 unsigned int pkt_len;
1502                 int ret;
1503
1504                 if (ep->state != WAIT_FOR_SETUP) {
1505                         /*
1506                          * Didn't expect a SETUP packet at this
1507                          * point. Clean up any pending requests (which
1508                          * may be successful).
1509                          */
1510                         int status = -EPROTO;
1511
1512                         /*
1513                          * RXRDY and TXCOMP are dropped when SETUP
1514                          * packets arrive.  Just pretend we received
1515                          * the status packet.
1516                          */
1517                         if (ep->state == STATUS_STAGE_OUT
1518                                         || ep->state == STATUS_STAGE_IN) {
1519                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1520                                 status = 0;
1521                         }
1522
1523                         if (req) {
1524                                 list_del_init(&req->queue);
1525                                 request_complete(ep, req, status);
1526                         }
1527                 }
1528
1529                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1530                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1531                 if (pkt_len != sizeof(crq)) {
1532                         pr_warning("udc: Invalid packet length %u "
1533                                 "(expected %lu)\n", pkt_len, sizeof(crq));
1534                         set_protocol_stall(udc, ep);
1535                         return;
1536                 }
1537
1538                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1539                 copy_from_fifo(crq.data, ep->fifo, sizeof(crq));
1540
1541                 /* Free up one bank in the FIFO so that we can
1542                  * generate or receive a reply right away. */
1543                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1544
1545                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1546                         ep->state, crq.crq.bRequestType,
1547                         crq.crq.bRequest); */
1548
1549                 if (crq.crq.bRequestType & USB_DIR_IN) {
1550                         /*
1551                          * The USB 2.0 spec states that "if wLength is
1552                          * zero, there is no data transfer phase."
1553                          * However, testusb #14 seems to actually
1554                          * expect a data phase even if wLength = 0...
1555                          */
1556                         ep->state = DATA_STAGE_IN;
1557                 } else {
1558                         if (crq.crq.wLength != __constant_cpu_to_le16(0))
1559                                 ep->state = DATA_STAGE_OUT;
1560                         else
1561                                 ep->state = STATUS_STAGE_IN;
1562                 }
1563
1564                 ret = -1;
1565                 if (ep->index == 0)
1566                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1567                 else {
1568                         spin_unlock(&udc->lock);
1569                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1570                         spin_lock(&udc->lock);
1571                 }
1572
1573                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1574                         crq.crq.bRequestType, crq.crq.bRequest,
1575                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1576
1577                 if (ret < 0) {
1578                         /* Let the host know that we failed */
1579                         set_protocol_stall(udc, ep);
1580                 }
1581         }
1582 }
1583
1584 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1585 {
1586         struct usba_request *req;
1587         u32 epstatus;
1588         u32 epctrl;
1589
1590         epstatus = usba_ep_readl(ep, STA);
1591         epctrl = usba_ep_readl(ep, CTL);
1592
1593         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1594
1595         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1596                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1597
1598                 if (list_empty(&ep->queue)) {
1599                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1600                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1601                         return;
1602                 }
1603
1604                 req = list_entry(ep->queue.next, struct usba_request, queue);
1605
1606                 if (req->using_dma) {
1607                         /* Send a zero-length packet */
1608                         usba_ep_writel(ep, SET_STA,
1609                                         USBA_TX_PK_RDY);
1610                         usba_ep_writel(ep, CTL_DIS,
1611                                         USBA_TX_PK_RDY);
1612                         list_del_init(&req->queue);
1613                         submit_next_request(ep);
1614                         request_complete(ep, req, 0);
1615                 } else {
1616                         if (req->submitted)
1617                                 next_fifo_transaction(ep, req);
1618                         else
1619                                 submit_request(ep, req);
1620
1621                         if (req->last_transaction) {
1622                                 list_del_init(&req->queue);
1623                                 submit_next_request(ep);
1624                                 request_complete(ep, req, 0);
1625                         }
1626                 }
1627
1628                 epstatus = usba_ep_readl(ep, STA);
1629                 epctrl = usba_ep_readl(ep, CTL);
1630         }
1631         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1632                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1633                 receive_data(ep);
1634                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1635         }
1636 }
1637
1638 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1639 {
1640         struct usba_request *req;
1641         u32 status, control, pending;
1642
1643         status = usba_dma_readl(ep, STATUS);
1644         control = usba_dma_readl(ep, CONTROL);
1645 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1646         ep->last_dma_status = status;
1647 #endif
1648         pending = status & control;
1649         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1650
1651         if (status & USBA_DMA_CH_EN) {
1652                 dev_err(&udc->pdev->dev,
1653                         "DMA_CH_EN is set after transfer is finished!\n");
1654                 dev_err(&udc->pdev->dev,
1655                         "status=%#08x, pending=%#08x, control=%#08x\n",
1656                         status, pending, control);
1657
1658                 /*
1659                  * try to pretend nothing happened. We might have to
1660                  * do something here...
1661                  */
1662         }
1663
1664         if (list_empty(&ep->queue))
1665                 /* Might happen if a reset comes along at the right moment */
1666                 return;
1667
1668         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1669                 req = list_entry(ep->queue.next, struct usba_request, queue);
1670                 usba_update_req(ep, req, status);
1671
1672                 list_del_init(&req->queue);
1673                 submit_next_request(ep);
1674                 request_complete(ep, req, 0);
1675         }
1676 }
1677
1678 static irqreturn_t usba_udc_irq(int irq, void *devid)
1679 {
1680         struct usba_udc *udc = devid;
1681         u32 status;
1682         u32 dma_status;
1683         u32 ep_status;
1684
1685         spin_lock(&udc->lock);
1686
1687         status = usba_readl(udc, INT_STA);
1688         DBG(DBG_INT, "irq, status=%#08x\n", status);
1689
1690         if (status & USBA_DET_SUSPEND) {
1691                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1692                 DBG(DBG_BUS, "Suspend detected\n");
1693                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1694                                 && udc->driver && udc->driver->suspend) {
1695                         spin_unlock(&udc->lock);
1696                         udc->driver->suspend(&udc->gadget);
1697                         spin_lock(&udc->lock);
1698                 }
1699         }
1700
1701         if (status & USBA_WAKE_UP) {
1702                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1703                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1704         }
1705
1706         if (status & USBA_END_OF_RESUME) {
1707                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1708                 DBG(DBG_BUS, "Resume detected\n");
1709                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1710                                 && udc->driver && udc->driver->resume) {
1711                         spin_unlock(&udc->lock);
1712                         udc->driver->resume(&udc->gadget);
1713                         spin_lock(&udc->lock);
1714                 }
1715         }
1716
1717         dma_status = USBA_BFEXT(DMA_INT, status);
1718         if (dma_status) {
1719                 int i;
1720
1721                 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1722                         if (dma_status & (1 << i))
1723                                 usba_dma_irq(udc, &usba_ep[i]);
1724         }
1725
1726         ep_status = USBA_BFEXT(EPT_INT, status);
1727         if (ep_status) {
1728                 int i;
1729
1730                 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1731                         if (ep_status & (1 << i)) {
1732                                 if (ep_is_control(&usba_ep[i]))
1733                                         usba_control_irq(udc, &usba_ep[i]);
1734                                 else
1735                                         usba_ep_irq(udc, &usba_ep[i]);
1736                         }
1737         }
1738
1739         if (status & USBA_END_OF_RESET) {
1740                 struct usba_ep *ep0;
1741
1742                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1743                 reset_all_endpoints(udc);
1744
1745                 if (status & USBA_HIGH_SPEED) {
1746                         DBG(DBG_BUS, "High-speed bus reset detected\n");
1747                         udc->gadget.speed = USB_SPEED_HIGH;
1748                 } else {
1749                         DBG(DBG_BUS, "Full-speed bus reset detected\n");
1750                         udc->gadget.speed = USB_SPEED_FULL;
1751                 }
1752
1753                 ep0 = &usba_ep[0];
1754                 ep0->desc = &usba_ep0_desc;
1755                 ep0->state = WAIT_FOR_SETUP;
1756                 usba_ep_writel(ep0, CFG,
1757                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1758                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1759                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1760                 usba_ep_writel(ep0, CTL_ENB,
1761                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1762                 usba_writel(udc, INT_ENB,
1763                                 (usba_readl(udc, INT_ENB)
1764                                 | USBA_BF(EPT_INT, 1)
1765                                 | USBA_DET_SUSPEND
1766                                 | USBA_END_OF_RESUME));
1767
1768                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1769                         dev_warn(&udc->pdev->dev,
1770                                  "WARNING: EP0 configuration is invalid!\n");
1771         }
1772
1773         spin_unlock(&udc->lock);
1774
1775         return IRQ_HANDLED;
1776 }
1777
1778 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1779 {
1780         struct usba_udc *udc = devid;
1781         int vbus;
1782
1783         /* debounce */
1784         udelay(10);
1785
1786         spin_lock(&udc->lock);
1787
1788         /* May happen if Vbus pin toggles during probe() */
1789         if (!udc->driver)
1790                 goto out;
1791
1792         vbus = gpio_get_value(udc->vbus_pin);
1793         if (vbus != udc->vbus_prev) {
1794                 if (vbus) {
1795                         usba_writel(udc, CTRL, USBA_EN_USBA);
1796                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1797                 } else {
1798                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1799                         reset_all_endpoints(udc);
1800                         usba_writel(udc, CTRL, 0);
1801                         spin_unlock(&udc->lock);
1802                         udc->driver->disconnect(&udc->gadget);
1803                         spin_lock(&udc->lock);
1804                 }
1805                 udc->vbus_prev = vbus;
1806         }
1807
1808 out:
1809         spin_unlock(&udc->lock);
1810
1811         return IRQ_HANDLED;
1812 }
1813
1814 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1815 {
1816         struct usba_udc *udc = &the_udc;
1817         unsigned long flags;
1818         int ret;
1819
1820         if (!udc->pdev)
1821                 return -ENODEV;
1822
1823         spin_lock_irqsave(&udc->lock, flags);
1824         if (udc->driver) {
1825                 spin_unlock_irqrestore(&udc->lock, flags);
1826                 return -EBUSY;
1827         }
1828
1829         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1830         udc->driver = driver;
1831         udc->gadget.dev.driver = &driver->driver;
1832         spin_unlock_irqrestore(&udc->lock, flags);
1833
1834         clk_enable(udc->pclk);
1835         clk_enable(udc->hclk);
1836
1837         ret = driver->bind(&udc->gadget);
1838         if (ret) {
1839                 DBG(DBG_ERR, "Could not bind to driver %s: error %d\n",
1840                         driver->driver.name, ret);
1841                 goto err_driver_bind;
1842         }
1843
1844         DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1845
1846         udc->vbus_prev = 0;
1847         if (udc->vbus_pin != -1)
1848                 enable_irq(gpio_to_irq(udc->vbus_pin));
1849
1850         /* If Vbus is present, enable the controller and wait for reset */
1851         spin_lock_irqsave(&udc->lock, flags);
1852         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1853                 usba_writel(udc, CTRL, USBA_EN_USBA);
1854                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1855         }
1856         spin_unlock_irqrestore(&udc->lock, flags);
1857
1858         return 0;
1859
1860 err_driver_bind:
1861         udc->driver = NULL;
1862         udc->gadget.dev.driver = NULL;
1863         return ret;
1864 }
1865 EXPORT_SYMBOL(usb_gadget_register_driver);
1866
1867 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1868 {
1869         struct usba_udc *udc = &the_udc;
1870         unsigned long flags;
1871
1872         if (!udc->pdev)
1873                 return -ENODEV;
1874         if (driver != udc->driver)
1875                 return -EINVAL;
1876
1877         if (udc->vbus_pin != -1)
1878                 disable_irq(gpio_to_irq(udc->vbus_pin));
1879
1880         spin_lock_irqsave(&udc->lock, flags);
1881         udc->gadget.speed = USB_SPEED_UNKNOWN;
1882         reset_all_endpoints(udc);
1883         spin_unlock_irqrestore(&udc->lock, flags);
1884
1885         /* This will also disable the DP pullup */
1886         usba_writel(udc, CTRL, 0);
1887
1888         driver->unbind(&udc->gadget);
1889         udc->gadget.dev.driver = NULL;
1890         udc->driver = NULL;
1891
1892         clk_disable(udc->hclk);
1893         clk_disable(udc->pclk);
1894
1895         DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1896
1897         return 0;
1898 }
1899 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1900
1901 static int __init usba_udc_probe(struct platform_device *pdev)
1902 {
1903         struct usba_platform_data *pdata = pdev->dev.platform_data;
1904         struct resource *regs, *fifo;
1905         struct clk *pclk, *hclk;
1906         struct usba_udc *udc = &the_udc;
1907         int irq, ret, i;
1908
1909         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1910         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1911         if (!regs || !fifo)
1912                 return -ENXIO;
1913
1914         irq = platform_get_irq(pdev, 0);
1915         if (irq < 0)
1916                 return irq;
1917
1918         pclk = clk_get(&pdev->dev, "pclk");
1919         if (IS_ERR(pclk))
1920                 return PTR_ERR(pclk);
1921         hclk = clk_get(&pdev->dev, "hclk");
1922         if (IS_ERR(hclk)) {
1923                 ret = PTR_ERR(hclk);
1924                 goto err_get_hclk;
1925         }
1926
1927         udc->pdev = pdev;
1928         udc->pclk = pclk;
1929         udc->hclk = hclk;
1930         udc->vbus_pin = -1;
1931
1932         ret = -ENOMEM;
1933         udc->regs = ioremap(regs->start, regs->end - regs->start + 1);
1934         if (!udc->regs) {
1935                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1936                 goto err_map_regs;
1937         }
1938         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1939                  (unsigned long)regs->start, udc->regs);
1940         udc->fifo = ioremap(fifo->start, fifo->end - fifo->start + 1);
1941         if (!udc->fifo) {
1942                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1943                 goto err_map_fifo;
1944         }
1945         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1946                  (unsigned long)fifo->start, udc->fifo);
1947
1948         device_initialize(&udc->gadget.dev);
1949         udc->gadget.dev.parent = &pdev->dev;
1950         udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1951
1952         platform_set_drvdata(pdev, udc);
1953
1954         /* Make sure we start from a clean slate */
1955         clk_enable(pclk);
1956         usba_writel(udc, CTRL, 0);
1957         clk_disable(pclk);
1958
1959         INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1960         usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1961         usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1962         usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1963         for (i = 1; i < ARRAY_SIZE(usba_ep); i++) {
1964                 struct usba_ep *ep = &usba_ep[i];
1965
1966                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1967                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1968                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1969
1970                 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1971         }
1972
1973         ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
1974         if (ret) {
1975                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
1976                         irq, ret);
1977                 goto err_request_irq;
1978         }
1979         udc->irq = irq;
1980
1981         ret = device_add(&udc->gadget.dev);
1982         if (ret) {
1983                 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
1984                 goto err_device_add;
1985         }
1986
1987         if (pdata && pdata->vbus_pin != GPIO_PIN_NONE) {
1988                 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
1989                         udc->vbus_pin = pdata->vbus_pin;
1990
1991                         ret = request_irq(gpio_to_irq(udc->vbus_pin),
1992                                         usba_vbus_irq, 0,
1993                                         "atmel_usba_udc", udc);
1994                         if (ret) {
1995                                 gpio_free(udc->vbus_pin);
1996                                 udc->vbus_pin = -1;
1997                                 dev_warn(&udc->pdev->dev,
1998                                          "failed to request vbus irq; "
1999                                          "assuming always on\n");
2000                         } else {
2001                                 disable_irq(gpio_to_irq(udc->vbus_pin));
2002                         }
2003                 }
2004         }
2005
2006         usba_init_debugfs(udc);
2007         for (i = 1; i < ARRAY_SIZE(usba_ep); i++)
2008                 usba_ep_init_debugfs(udc, &usba_ep[i]);
2009
2010         return 0;
2011
2012 err_device_add:
2013         free_irq(irq, udc);
2014 err_request_irq:
2015         iounmap(udc->fifo);
2016 err_map_fifo:
2017         iounmap(udc->regs);
2018 err_map_regs:
2019         clk_put(hclk);
2020 err_get_hclk:
2021         clk_put(pclk);
2022
2023         platform_set_drvdata(pdev, NULL);
2024
2025         return ret;
2026 }
2027
2028 static int __exit usba_udc_remove(struct platform_device *pdev)
2029 {
2030         struct usba_udc *udc;
2031         int i;
2032
2033         udc = platform_get_drvdata(pdev);
2034
2035         for (i = 1; i < ARRAY_SIZE(usba_ep); i++)
2036                 usba_ep_cleanup_debugfs(&usba_ep[i]);
2037         usba_cleanup_debugfs(udc);
2038
2039         if (udc->vbus_pin != -1)
2040                 gpio_free(udc->vbus_pin);
2041
2042         free_irq(udc->irq, udc);
2043         iounmap(udc->fifo);
2044         iounmap(udc->regs);
2045         clk_put(udc->hclk);
2046         clk_put(udc->pclk);
2047
2048         device_unregister(&udc->gadget.dev);
2049
2050         return 0;
2051 }
2052
2053 static struct platform_driver udc_driver = {
2054         .remove         = __exit_p(usba_udc_remove),
2055         .driver         = {
2056                 .name           = "atmel_usba_udc",
2057         },
2058 };
2059
2060 static int __init udc_init(void)
2061 {
2062         return platform_driver_probe(&udc_driver, usba_udc_probe);
2063 }
2064 module_init(udc_init);
2065
2066 static void __exit udc_exit(void)
2067 {
2068         platform_driver_unregister(&udc_driver);
2069 }
2070 module_exit(udc_exit);
2071
2072 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2073 MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
2074 MODULE_LICENSE("GPL");