git.oblomov.eu Git - linux-2.6/blob - 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 next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 328 {
 329         unsigned int transaction_len;
 330
 331         transaction_len = req->req.length - req->req.actual;
 332         req->last_transaction = 1;
 333         if (transaction_len > ep->ep.maxpacket) {
 334                 transaction_len = ep->ep.maxpacket;
 335                 req->last_transaction = 0;
 336         } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
 337                 req->last_transaction = 0;
 338
 339         DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
 340                 ep->ep.name, req, transaction_len,
 341                 req->last_transaction ? ", done" : "");
 342
 343         memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
 344         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 345         req->req.actual += transaction_len;
 346 }
 347
 348 static void submit_request(struct usba_ep *ep, struct usba_request *req)
 349 {
 350         DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
 351                 ep->ep.name, req, req->req.length);
 352
 353         req->req.actual = 0;
 354         req->submitted = 1;
 355
 356         if (req->using_dma) {
 357                 if (req->req.length == 0) {
 358                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 359                         return;
 360                 }
 361
 362                 if (req->req.zero)
 363                         usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
 364                 else
 365                         usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
 366
 367                 usba_dma_writel(ep, ADDRESS, req->req.dma);
 368                 usba_dma_writel(ep, CONTROL, req->ctrl);
 369         } else {
 370                 next_fifo_transaction(ep, req);
 371                 if (req->last_transaction) {
 372                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
 373                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 374                 } else {
 375                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
 376                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 377                 }
 378         }
 379 }
 380
 381 static void submit_next_request(struct usba_ep *ep)
 382 {
 383         struct usba_request *req;
 384
 385         if (list_empty(&ep->queue)) {
 386                 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
 387                 return;
 388         }
 389
 390         req = list_entry(ep->queue.next, struct usba_request, queue);
 391         if (!req->submitted)
 392                 submit_request(ep, req);
 393 }
 394
 395 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
 396 {
 397         ep->state = STATUS_STAGE_IN;
 398         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 399         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 400 }
 401
 402 static void receive_data(struct usba_ep *ep)
 403 {
 404         struct usba_udc *udc = ep->udc;
 405         struct usba_request *req;
 406         unsigned long status;
 407         unsigned int bytecount, nr_busy;
 408         int is_complete = 0;
 409
 410         status = usba_ep_readl(ep, STA);
 411         nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 412
 413         DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
 414
 415         while (nr_busy > 0) {
 416                 if (list_empty(&ep->queue)) {
 417                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 418                         break;
 419                 }
 420                 req = list_entry(ep->queue.next,
 421                                  struct usba_request, queue);
 422
 423                 bytecount = USBA_BFEXT(BYTE_COUNT, status);
 424
 425                 if (status & (1 << 31))
 426                         is_complete = 1;
 427                 if (req->req.actual + bytecount >= req->req.length) {
 428                         is_complete = 1;
 429                         bytecount = req->req.length - req->req.actual;
 430                 }
 431
 432                 memcpy_fromio(req->req.buf + req->req.actual,
 433                                 ep->fifo, bytecount);
 434                 req->req.actual += bytecount;
 435
 436                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
 437
 438                 if (is_complete) {
 439                         DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
 440                         req->req.status = 0;
 441                         list_del_init(&req->queue);
 442                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 443                         spin_unlock(&udc->lock);
 444                         req->req.complete(&ep->ep, &req->req);
 445                         spin_lock(&udc->lock);
 446                 }
 447
 448                 status = usba_ep_readl(ep, STA);
 449                 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 450
 451                 if (is_complete && ep_is_control(ep)) {
 452                         send_status(udc, ep);
 453                         break;
 454                 }
 455         }
 456 }
 457
 458 static void
 459 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
 460 {
 461         struct usba_udc *udc = ep->udc;
 462
 463         WARN_ON(!list_empty(&req->queue));
 464
 465         if (req->req.status == -EINPROGRESS)
 466                 req->req.status = status;
 467
 468         if (req->mapped) {
 469                 dma_unmap_single(
 470                         &udc->pdev->dev, req->req.dma, req->req.length,
 471                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 472                 req->req.dma = DMA_ADDR_INVALID;
 473                 req->mapped = 0;
 474         }
 475
 476         DBG(DBG_GADGET | DBG_REQ,
 477                 "%s: req %p complete: status %d, actual %u\n",
 478                 ep->ep.name, req, req->req.status, req->req.actual);
 479
 480         spin_unlock(&udc->lock);
 481         req->req.complete(&ep->ep, &req->req);
 482         spin_lock(&udc->lock);
 483 }
 484
 485 static void
 486 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
 487 {
 488         struct usba_request *req, *tmp_req;
 489
 490         list_for_each_entry_safe(req, tmp_req, list, queue) {
 491                 list_del_init(&req->queue);
 492                 request_complete(ep, req, status);
 493         }
 494 }
 495
 496 static int
 497 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 498 {
 499         struct usba_ep *ep = to_usba_ep(_ep);
 500         struct usba_udc *udc = ep->udc;
 501         unsigned long flags, ept_cfg, maxpacket;
 502         unsigned int nr_trans;
 503
 504         DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
 505
 506         maxpacket = le16_to_cpu(desc->wMaxPacketSize) & 0x7ff;
 507
 508         if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
 509                         || ep->index == 0
 510                         || desc->bDescriptorType != USB_DT_ENDPOINT
 511                         || maxpacket == 0
 512                         || maxpacket > ep->fifo_size) {
 513                 DBG(DBG_ERR, "ep_enable: Invalid argument");
 514                 return -EINVAL;
 515         }
 516
 517         ep->is_isoc = 0;
 518         ep->is_in = 0;
 519
 520         if (maxpacket <= 8)
 521                 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
 522         else
 523                 /* LSB is bit 1, not 0 */
 524                 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
 525
 526         DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
 527                         ep->ep.name, ept_cfg, maxpacket);
 528
 529         if ((desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
 530                 ep->is_in = 1;
 531                 ept_cfg |= USBA_EPT_DIR_IN;
 532         }
 533
 534         switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 535         case USB_ENDPOINT_XFER_CONTROL:
 536                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 537                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
 538                 break;
 539         case USB_ENDPOINT_XFER_ISOC:
 540                 if (!ep->can_isoc) {
 541                         DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
 542                                         ep->ep.name);
 543                         return -EINVAL;
 544                 }
 545
 546                 /*
 547                  * Bits 11:12 specify number of _additional_
 548                  * transactions per microframe.
 549                  */
 550                 nr_trans = ((le16_to_cpu(desc->wMaxPacketSize) >> 11) & 3) + 1;
 551                 if (nr_trans > 3)
 552                         return -EINVAL;
 553
 554                 ep->is_isoc = 1;
 555                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 556
 557                 /*
 558                  * Do triple-buffering on high-bandwidth iso endpoints.
 559                  */
 560                 if (nr_trans > 1 && ep->nr_banks == 3)
 561                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
 562                 else
 563                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 564                 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 565                 break;
 566         case USB_ENDPOINT_XFER_BULK:
 567                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 568                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 569                 break;
 570         case USB_ENDPOINT_XFER_INT:
 571                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 572                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 573                 break;
 574         }
 575
 576         spin_lock_irqsave(&ep->udc->lock, flags);
 577
 578         if (ep->desc) {
 579                 spin_unlock_irqrestore(&ep->udc->lock, flags);
 580                 DBG(DBG_ERR, "ep%d already enabled\n", ep->index);
 581                 return -EBUSY;
 582         }
 583
 584         ep->desc = desc;
 585         ep->ep.maxpacket = maxpacket;
 586
 587         usba_ep_writel(ep, CFG, ept_cfg);
 588         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 589
 590         if (ep->can_dma) {
 591                 u32 ctrl;
 592
 593                 usba_writel(udc, INT_ENB,
 594                                 (usba_readl(udc, INT_ENB)
 595                                         | USBA_BF(EPT_INT, 1 << ep->index)
 596                                         | USBA_BF(DMA_INT, 1 << ep->index)));
 597                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 598                 usba_ep_writel(ep, CTL_ENB, ctrl);
 599         } else {
 600                 usba_writel(udc, INT_ENB,
 601                                 (usba_readl(udc, INT_ENB)
 602                                         | USBA_BF(EPT_INT, 1 << ep->index)));
 603         }
 604
 605         spin_unlock_irqrestore(&udc->lock, flags);
 606
 607         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 608                         (unsigned long)usba_ep_readl(ep, CFG));
 609         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 610                         (unsigned long)usba_readl(udc, INT_ENB));
 611
 612         return 0;
 613 }
 614
 615 static int usba_ep_disable(struct usb_ep *_ep)
 616 {
 617         struct usba_ep *ep = to_usba_ep(_ep);
 618         struct usba_udc *udc = ep->udc;
 619         LIST_HEAD(req_list);
 620         unsigned long flags;
 621
 622         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 623
 624         spin_lock_irqsave(&udc->lock, flags);
 625
 626         if (!ep->desc) {
 627                 spin_unlock_irqrestore(&udc->lock, flags);
 628                 DBG(DBG_ERR, "ep_disable: %s not enabled\n", ep->ep.name);
 629                 return -EINVAL;
 630         }
 631         ep->desc = NULL;
 632
 633         list_splice_init(&ep->queue, &req_list);
 634         if (ep->can_dma) {
 635                 usba_dma_writel(ep, CONTROL, 0);
 636                 usba_dma_writel(ep, ADDRESS, 0);
 637                 usba_dma_readl(ep, STATUS);
 638         }
 639         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 640         usba_writel(udc, INT_ENB,
 641                         usba_readl(udc, INT_ENB)
 642                         & ~USBA_BF(EPT_INT, 1 << ep->index));
 643
 644         request_complete_list(ep, &req_list, -ESHUTDOWN);
 645
 646         spin_unlock_irqrestore(&udc->lock, flags);
 647
 648         return 0;
 649 }
 650
 651 static struct usb_request *
 652 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 653 {
 654         struct usba_request *req;
 655
 656         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 657
 658         req = kzalloc(sizeof(*req), gfp_flags);
 659         if (!req)
 660                 return NULL;
 661
 662         INIT_LIST_HEAD(&req->queue);
 663         req->req.dma = DMA_ADDR_INVALID;
 664
 665         return &req->req;
 666 }
 667
 668 static void
 669 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 670 {
 671         struct usba_request *req = to_usba_req(_req);
 672
 673         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 674
 675         kfree(req);
 676 }
 677
 678 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 679                 struct usba_request *req, gfp_t gfp_flags)
 680 {
 681         unsigned long flags;
 682         int ret;
 683
 684         DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
 685                 ep->ep.name, req->req.length, req->req.dma,
 686                 req->req.zero ? 'Z' : 'z',
 687                 req->req.short_not_ok ? 'S' : 's',
 688                 req->req.no_interrupt ? 'I' : 'i');
 689
 690         if (req->req.length > 0x10000) {
 691                 /* Lengths from 0 to 65536 (inclusive) are supported */
 692                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 693                 return -EINVAL;
 694         }
 695
 696         req->using_dma = 1;
 697
 698         if (req->req.dma == DMA_ADDR_INVALID) {
 699                 req->req.dma = dma_map_single(
 700                         &udc->pdev->dev, req->req.buf, req->req.length,
 701                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 702                 req->mapped = 1;
 703         } else {
 704                 dma_sync_single_for_device(
 705                         &udc->pdev->dev, req->req.dma, req->req.length,
 706                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 707                 req->mapped = 0;
 708         }
 709
 710         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 711                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 712                         | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 713
 714         if (ep->is_in)
 715                 req->ctrl |= USBA_DMA_END_BUF_EN;
 716
 717         /*
 718          * Add this request to the queue and submit for DMA if
 719          * possible. Check if we're still alive first -- we may have
 720          * received a reset since last time we checked.
 721          */
 722         ret = -ESHUTDOWN;
 723         spin_lock_irqsave(&udc->lock, flags);
 724         if (ep->desc) {
 725                 if (list_empty(&ep->queue))
 726                         submit_request(ep, req);
 727
 728                 list_add_tail(&req->queue, &ep->queue);
 729                 ret = 0;
 730         }
 731         spin_unlock_irqrestore(&udc->lock, flags);
 732
 733         return ret;
 734 }
 735
 736 static int
 737 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 738 {
 739         struct usba_request *req = to_usba_req(_req);
 740         struct usba_ep *ep = to_usba_ep(_ep);
 741         struct usba_udc *udc = ep->udc;
 742         unsigned long flags;
 743         int ret;
 744
 745         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 746                         ep->ep.name, req, _req->length);
 747
 748         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN || !ep->desc)
 749                 return -ESHUTDOWN;
 750
 751         req->submitted = 0;
 752         req->using_dma = 0;
 753         req->last_transaction = 0;
 754
 755         _req->status = -EINPROGRESS;
 756         _req->actual = 0;
 757
 758         if (ep->can_dma)
 759                 return queue_dma(udc, ep, req, gfp_flags);
 760
 761         /* May have received a reset since last time we checked */
 762         ret = -ESHUTDOWN;
 763         spin_lock_irqsave(&udc->lock, flags);
 764         if (ep->desc) {
 765                 list_add_tail(&req->queue, &ep->queue);
 766
 767                 if (ep->is_in || (ep_is_control(ep)
 768                                 && (ep->state == DATA_STAGE_IN
 769                                         || ep->state == STATUS_STAGE_IN)))
 770                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 771                 else
 772                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 773                 ret = 0;
 774         }
 775         spin_unlock_irqrestore(&udc->lock, flags);
 776
 777         return ret;
 778 }
 779
 780 static void
 781 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 782 {
 783         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 784 }
 785
 786 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 787 {
 788         unsigned int timeout;
 789         u32 status;
 790
 791         /*
 792          * Stop the DMA controller. When writing both CH_EN
 793          * and LINK to 0, the other bits are not affected.
 794          */
 795         usba_dma_writel(ep, CONTROL, 0);
 796
 797         /* Wait for the FIFO to empty */
 798         for (timeout = 40; timeout; --timeout) {
 799                 status = usba_dma_readl(ep, STATUS);
 800                 if (!(status & USBA_DMA_CH_EN))
 801                         break;
 802                 udelay(1);
 803         }
 804
 805         if (pstatus)
 806                 *pstatus = status;
 807
 808         if (timeout == 0) {
 809                 dev_err(&ep->udc->pdev->dev,
 810                         "%s: timed out waiting for DMA FIFO to empty\n",
 811                         ep->ep.name);
 812                 return -ETIMEDOUT;
 813         }
 814
 815         return 0;
 816 }
 817
 818 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 819 {
 820         struct usba_ep *ep = to_usba_ep(_ep);
 821         struct usba_udc *udc = ep->udc;
 822         struct usba_request *req = to_usba_req(_req);
 823         unsigned long flags;
 824         u32 status;
 825
 826         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 827                         ep->ep.name, req);
 828
 829         spin_lock_irqsave(&udc->lock, flags);
 830
 831         if (req->using_dma) {
 832                 /*
 833                  * If this request is currently being transferred,
 834                  * stop the DMA controller and reset the FIFO.
 835                  */
 836                 if (ep->queue.next == &req->queue) {
 837                         status = usba_dma_readl(ep, STATUS);
 838                         if (status & USBA_DMA_CH_EN)
 839                                 stop_dma(ep, &status);
 840
 841 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 842                         ep->last_dma_status = status;
 843 #endif
 844
 845                         usba_writel(udc, EPT_RST, 1 << ep->index);
 846
 847                         usba_update_req(ep, req, status);
 848                 }
 849         }
 850
 851         /*
 852          * Errors should stop the queue from advancing until the
 853          * completion function returns.
 854          */
 855         list_del_init(&req->queue);
 856
 857         request_complete(ep, req, -ECONNRESET);
 858
 859         /* Process the next request if any */
 860         submit_next_request(ep);
 861         spin_unlock_irqrestore(&udc->lock, flags);
 862
 863         return 0;
 864 }
 865
 866 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 867 {
 868         struct usba_ep *ep = to_usba_ep(_ep);
 869         struct usba_udc *udc = ep->udc;
 870         unsigned long flags;
 871         int ret = 0;
 872
 873         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 874                         value ? "set" : "clear");
 875
 876         if (!ep->desc) {
 877                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 878                                 ep->ep.name);
 879                 return -ENODEV;
 880         }
 881         if (ep->is_isoc) {
 882                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 883                                 ep->ep.name);
 884                 return -ENOTTY;
 885         }
 886
 887         spin_lock_irqsave(&udc->lock, flags);
 888
 889         /*
 890          * We can't halt IN endpoints while there are still data to be
 891          * transferred
 892          */
 893         if (!list_empty(&ep->queue)
 894                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 895                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 896                 ret = -EAGAIN;
 897         } else {
 898                 if (value)
 899                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 900                 else
 901                         usba_ep_writel(ep, CLR_STA,
 902                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 903                 usba_ep_readl(ep, STA);
 904         }
 905
 906         spin_unlock_irqrestore(&udc->lock, flags);
 907
 908         return ret;
 909 }
 910
 911 static int usba_ep_fifo_status(struct usb_ep *_ep)
 912 {
 913         struct usba_ep *ep = to_usba_ep(_ep);
 914
 915         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 916 }
 917
 918 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 919 {
 920         struct usba_ep *ep = to_usba_ep(_ep);
 921         struct usba_udc *udc = ep->udc;
 922
 923         usba_writel(udc, EPT_RST, 1 << ep->index);
 924 }
 925
 926 static const struct usb_ep_ops usba_ep_ops = {
 927         .enable         = usba_ep_enable,
 928         .disable        = usba_ep_disable,
 929         .alloc_request  = usba_ep_alloc_request,
 930         .free_request   = usba_ep_free_request,
 931         .queue          = usba_ep_queue,
 932         .dequeue        = usba_ep_dequeue,
 933         .set_halt       = usba_ep_set_halt,
 934         .fifo_status    = usba_ep_fifo_status,
 935         .fifo_flush     = usba_ep_fifo_flush,
 936 };
 937
 938 static int usba_udc_get_frame(struct usb_gadget *gadget)
 939 {
 940         struct usba_udc *udc = to_usba_udc(gadget);
 941
 942         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 943 }
 944
 945 static int usba_udc_wakeup(struct usb_gadget *gadget)
 946 {
 947         struct usba_udc *udc = to_usba_udc(gadget);
 948         unsigned long flags;
 949         u32 ctrl;
 950         int ret = -EINVAL;
 951
 952         spin_lock_irqsave(&udc->lock, flags);
 953         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 954                 ctrl = usba_readl(udc, CTRL);
 955                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 956                 ret = 0;
 957         }
 958         spin_unlock_irqrestore(&udc->lock, flags);
 959
 960         return ret;
 961 }
 962
 963 static int
 964 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 965 {
 966         struct usba_udc *udc = to_usba_udc(gadget);
 967         unsigned long flags;
 968
 969         spin_lock_irqsave(&udc->lock, flags);
 970         if (is_selfpowered)
 971                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
 972         else
 973                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 974         spin_unlock_irqrestore(&udc->lock, flags);
 975
 976         return 0;
 977 }
 978
 979 static const struct usb_gadget_ops usba_udc_ops = {
 980         .get_frame              = usba_udc_get_frame,
 981         .wakeup                 = usba_udc_wakeup,
 982         .set_selfpowered        = usba_udc_set_selfpowered,
 983 };
 984
 985 #define EP(nam, idx, maxpkt, maxbk, dma, isoc)                  \
 986 {                                                               \
 987         .ep     = {                                             \
 988                 .ops            = &usba_ep_ops,                 \
 989                 .name           = nam,                          \
 990                 .maxpacket      = maxpkt,                       \
 991         },                                                      \
 992         .udc            = &the_udc,                             \
 993         .queue          = LIST_HEAD_INIT(usba_ep[idx].queue),   \
 994         .fifo_size      = maxpkt,                               \
 995         .nr_banks       = maxbk,                                \
 996         .index          = idx,                                  \
 997         .can_dma        = dma,                                  \
 998         .can_isoc       = isoc,                                 \
 999 }
1000
1001 static struct usba_ep usba_ep[] = {
1002         EP("ep0",     0,   64, 1, 0, 0),
1003         EP("ep1",     1,  512, 2, 1, 1),
1004         EP("ep2",     2,  512, 2, 1, 1),
1005         EP("ep3-int", 3,   64, 3, 1, 0),
1006         EP("ep4-int", 4,   64, 3, 1, 0),
1007         EP("ep5",     5, 1024, 3, 1, 1),
1008         EP("ep6",     6, 1024, 3, 1, 1),
1009 };
1010 #undef EP
1011
1012 static struct usb_endpoint_descriptor usba_ep0_desc = {
1013         .bLength = USB_DT_ENDPOINT_SIZE,
1014         .bDescriptorType = USB_DT_ENDPOINT,
1015         .bEndpointAddress = 0,
1016         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1017         .wMaxPacketSize = __constant_cpu_to_le16(64),
1018         /* FIXME: I have no idea what to put here */
1019         .bInterval = 1,
1020 };
1021
1022 static void nop_release(struct device *dev)
1023 {
1024
1025 }
1026
1027 static struct usba_udc the_udc = {
1028         .gadget = {
1029                 .ops            = &usba_udc_ops,
1030                 .ep0            = &usba_ep[0].ep,
1031                 .ep_list        = LIST_HEAD_INIT(the_udc.gadget.ep_list),
1032                 .is_dualspeed   = 1,
1033                 .name           = "atmel_usba_udc",
1034                 .dev    = {
1035                         .bus_id         = "gadget",
1036                         .release        = nop_release,
1037                 },
1038         },
1039
1040         .lock   = SPIN_LOCK_UNLOCKED,
1041 };
1042
1043 /*
1044  * Called with interrupts disabled and udc->lock held.
1045  */
1046 static void reset_all_endpoints(struct usba_udc *udc)
1047 {
1048         struct usba_ep *ep;
1049         struct usba_request *req, *tmp_req;
1050
1051         usba_writel(udc, EPT_RST, ~0UL);
1052
1053         ep = to_usba_ep(udc->gadget.ep0);
1054         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1055                 list_del_init(&req->queue);
1056                 request_complete(ep, req, -ECONNRESET);
1057         }
1058
1059         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1060                 if (ep->desc) {
1061                         spin_unlock(&udc->lock);
1062                         usba_ep_disable(&ep->ep);
1063                         spin_lock(&udc->lock);
1064                 }
1065         }
1066 }
1067
1068 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1069 {
1070         struct usba_ep *ep;
1071
1072         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1073                 return to_usba_ep(udc->gadget.ep0);
1074
1075         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1076                 u8 bEndpointAddress;
1077
1078                 if (!ep->desc)
1079                         continue;
1080                 bEndpointAddress = ep->desc->bEndpointAddress;
1081                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1082                         continue;
1083                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1084                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1085                         return ep;
1086         }
1087
1088         return NULL;
1089 }
1090
1091 /* Called with interrupts disabled and udc->lock held */
1092 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1093 {
1094         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1095         ep->state = WAIT_FOR_SETUP;
1096 }
1097
1098 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1099 {
1100         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1101                 return 1;
1102         return 0;
1103 }
1104
1105 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1106 {
1107         u32 regval;
1108
1109         DBG(DBG_BUS, "setting address %u...\n", addr);
1110         regval = usba_readl(udc, CTRL);
1111         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1112         usba_writel(udc, CTRL, regval);
1113 }
1114
1115 static int do_test_mode(struct usba_udc *udc)
1116 {
1117         static const char test_packet_buffer[] = {
1118                 /* JKJKJKJK * 9 */
1119                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1120                 /* JJKKJJKK * 8 */
1121                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1122                 /* JJKKJJKK * 8 */
1123                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1124                 /* JJJJJJJKKKKKKK * 8 */
1125                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1126                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1127                 /* JJJJJJJK * 8 */
1128                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1129                 /* {JKKKKKKK * 10}, JK */
1130                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1131         };
1132         struct usba_ep *ep;
1133         struct device *dev = &udc->pdev->dev;
1134         int test_mode;
1135
1136         test_mode = udc->test_mode;
1137
1138         /* Start from a clean slate */
1139         reset_all_endpoints(udc);
1140
1141         switch (test_mode) {
1142         case 0x0100:
1143                 /* Test_J */
1144                 usba_writel(udc, TST, USBA_TST_J_MODE);
1145                 dev_info(dev, "Entering Test_J mode...\n");
1146                 break;
1147         case 0x0200:
1148                 /* Test_K */
1149                 usba_writel(udc, TST, USBA_TST_K_MODE);
1150                 dev_info(dev, "Entering Test_K mode...\n");
1151                 break;
1152         case 0x0300:
1153                 /*
1154                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1155                  * for Bulk IN transfers
1156                  */
1157                 ep = &usba_ep[0];
1158                 usba_writel(udc, TST,
1159                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1160                 usba_ep_writel(ep, CFG,
1161                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1162                                 | USBA_EPT_DIR_IN
1163                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1164                                 | USBA_BF(BK_NUMBER, 1));
1165                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1166                         set_protocol_stall(udc, ep);
1167                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1168                 } else {
1169                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1170                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1171                 }
1172                 break;
1173         case 0x0400:
1174                 /* Test_Packet */
1175                 ep = &usba_ep[0];
1176                 usba_ep_writel(ep, CFG,
1177                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1178                                 | USBA_EPT_DIR_IN
1179                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1180                                 | USBA_BF(BK_NUMBER, 1));
1181                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1182                         set_protocol_stall(udc, ep);
1183                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1184                 } else {
1185                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1186                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1187                         memcpy_toio(ep->fifo, test_packet_buffer,
1188                                         sizeof(test_packet_buffer));
1189                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1190                         dev_info(dev, "Entering Test_Packet mode...\n");
1191                 }
1192                 break;
1193         default:
1194                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1195                 return -EINVAL;
1196         }
1197
1198         return 0;
1199 }
1200
1201 /* Avoid overly long expressions */
1202 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1203 {
1204         if (crq->wValue == __constant_cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1205                 return true;
1206         return false;
1207 }
1208
1209 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1210 {
1211         if (crq->wValue == __constant_cpu_to_le16(USB_DEVICE_TEST_MODE))
1212                 return true;
1213         return false;
1214 }
1215
1216 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1217 {
1218         if (crq->wValue == __constant_cpu_to_le16(USB_ENDPOINT_HALT))
1219                 return true;
1220         return false;
1221 }
1222
1223 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1224                 struct usb_ctrlrequest *crq)
1225 {
1226         int retval = 0;;
1227
1228         switch (crq->bRequest) {
1229         case USB_REQ_GET_STATUS: {
1230                 u16 status;
1231
1232                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1233                         status = cpu_to_le16(udc->devstatus);
1234                 } else if (crq->bRequestType
1235                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1236                         status = __constant_cpu_to_le16(0);
1237                 } else if (crq->bRequestType
1238                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1239                         struct usba_ep *target;
1240
1241                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1242                         if (!target)
1243                                 goto stall;
1244
1245                         status = 0;
1246                         if (is_stalled(udc, target))
1247                                 status |= __constant_cpu_to_le16(1);
1248                 } else
1249                         goto delegate;
1250
1251                 /* Write directly to the FIFO. No queueing is done. */
1252                 if (crq->wLength != __constant_cpu_to_le16(sizeof(status)))
1253                         goto stall;
1254                 ep->state = DATA_STAGE_IN;
1255                 __raw_writew(status, ep->fifo);
1256                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1257                 break;
1258         }
1259
1260         case USB_REQ_CLEAR_FEATURE: {
1261                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1262                         if (feature_is_dev_remote_wakeup(crq))
1263                                 udc->devstatus
1264                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1265                         else
1266                                 /* Can't CLEAR_FEATURE TEST_MODE */
1267                                 goto stall;
1268                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1269                         struct usba_ep *target;
1270
1271                         if (crq->wLength != __constant_cpu_to_le16(0)
1272                                         || !feature_is_ep_halt(crq))
1273                                 goto stall;
1274                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1275                         if (!target)
1276                                 goto stall;
1277
1278                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1279                         if (target->index != 0)
1280                                 usba_ep_writel(target, CLR_STA,
1281                                                 USBA_TOGGLE_CLR);
1282                 } else {
1283                         goto delegate;
1284                 }
1285
1286                 send_status(udc, ep);
1287                 break;
1288         }
1289
1290         case USB_REQ_SET_FEATURE: {
1291                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1292                         if (feature_is_dev_test_mode(crq)) {
1293                                 send_status(udc, ep);
1294                                 ep->state = STATUS_STAGE_TEST;
1295                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1296                                 return 0;
1297                         } else if (feature_is_dev_remote_wakeup(crq)) {
1298                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1299                         } else {
1300                                 goto stall;
1301                         }
1302                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1303                         struct usba_ep *target;
1304
1305                         if (crq->wLength != __constant_cpu_to_le16(0)
1306                                         || !feature_is_ep_halt(crq))
1307                                 goto stall;
1308
1309                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1310                         if (!target)
1311                                 goto stall;
1312
1313                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1314                 } else
1315                         goto delegate;
1316
1317                 send_status(udc, ep);
1318                 break;
1319         }
1320
1321         case USB_REQ_SET_ADDRESS:
1322                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1323                         goto delegate;
1324
1325                 set_address(udc, le16_to_cpu(crq->wValue));
1326                 send_status(udc, ep);
1327                 ep->state = STATUS_STAGE_ADDR;
1328                 break;
1329
1330         default:
1331 delegate:
1332                 spin_unlock(&udc->lock);
1333                 retval = udc->driver->setup(&udc->gadget, crq);
1334                 spin_lock(&udc->lock);
1335         }
1336
1337         return retval;
1338
1339 stall:
1340         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1341                 "halting endpoint...\n",
1342                 ep->ep.name, crq->bRequestType, crq->bRequest,
1343                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1344                 le16_to_cpu(crq->wLength));
1345         set_protocol_stall(udc, ep);
1346         return -1;
1347 }
1348
1349 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1350 {
1351         struct usba_request *req;
1352         u32 epstatus;
1353         u32 epctrl;
1354
1355 restart:
1356         epstatus = usba_ep_readl(ep, STA);
1357         epctrl = usba_ep_readl(ep, CTL);
1358
1359         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1360                         ep->ep.name, ep->state, epstatus, epctrl);
1361
1362         req = NULL;
1363         if (!list_empty(&ep->queue))
1364                 req = list_entry(ep->queue.next,
1365                                  struct usba_request, queue);
1366
1367         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1368                 if (req->submitted)
1369                         next_fifo_transaction(ep, req);
1370                 else
1371                         submit_request(ep, req);
1372
1373                 if (req->last_transaction) {
1374                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1375                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1376                 }
1377                 goto restart;
1378         }
1379         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1380                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1381
1382                 switch (ep->state) {
1383                 case DATA_STAGE_IN:
1384                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1385                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1386                         ep->state = STATUS_STAGE_OUT;
1387                         break;
1388                 case STATUS_STAGE_ADDR:
1389                         /* Activate our new address */
1390                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1391                                                 | USBA_FADDR_EN));
1392                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1393                         ep->state = WAIT_FOR_SETUP;
1394                         break;
1395                 case STATUS_STAGE_IN:
1396                         if (req) {
1397                                 list_del_init(&req->queue);
1398                                 request_complete(ep, req, 0);
1399                                 submit_next_request(ep);
1400                         }
1401                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1402                         ep->state = WAIT_FOR_SETUP;
1403                         break;
1404                 case STATUS_STAGE_TEST:
1405                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1406                         ep->state = WAIT_FOR_SETUP;
1407                         if (do_test_mode(udc))
1408                                 set_protocol_stall(udc, ep);
1409                         break;
1410                 default:
1411                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1412                                 "halting endpoint...\n",
1413                                 ep->ep.name, ep->state);
1414                         set_protocol_stall(udc, ep);
1415                         break;
1416                 }
1417
1418                 goto restart;
1419         }
1420         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1421                 switch (ep->state) {
1422                 case STATUS_STAGE_OUT:
1423                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1424                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1425
1426                         if (req) {
1427                                 list_del_init(&req->queue);
1428                                 request_complete(ep, req, 0);
1429                         }
1430                         ep->state = WAIT_FOR_SETUP;
1431                         break;
1432
1433                 case DATA_STAGE_OUT:
1434                         receive_data(ep);
1435                         break;
1436
1437                 default:
1438                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1439                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1440                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1441                                 "halting endpoint...\n",
1442                                 ep->ep.name, ep->state);
1443                         set_protocol_stall(udc, ep);
1444                         break;
1445                 }
1446
1447                 goto restart;
1448         }
1449         if (epstatus & USBA_RX_SETUP) {
1450                 union {
1451                         struct usb_ctrlrequest crq;
1452                         unsigned long data[2];
1453                 } crq;
1454                 unsigned int pkt_len;
1455                 int ret;
1456
1457                 if (ep->state != WAIT_FOR_SETUP) {
1458                         /*
1459                          * Didn't expect a SETUP packet at this
1460                          * point. Clean up any pending requests (which
1461                          * may be successful).
1462                          */
1463                         int status = -EPROTO;
1464
1465                         /*
1466                          * RXRDY and TXCOMP are dropped when SETUP
1467                          * packets arrive.  Just pretend we received
1468                          * the status packet.
1469                          */
1470                         if (ep->state == STATUS_STAGE_OUT
1471                                         || ep->state == STATUS_STAGE_IN) {
1472                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1473                                 status = 0;
1474                         }
1475
1476                         if (req) {
1477                                 list_del_init(&req->queue);
1478                                 request_complete(ep, req, status);
1479                         }
1480                 }
1481
1482                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1483                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1484                 if (pkt_len != sizeof(crq)) {
1485                         pr_warning("udc: Invalid packet length %u "
1486                                 "(expected %lu)\n", pkt_len, sizeof(crq));
1487                         set_protocol_stall(udc, ep);
1488                         return;
1489                 }
1490
1491                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1492                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1493
1494                 /* Free up one bank in the FIFO so that we can
1495                  * generate or receive a reply right away. */
1496                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1497
1498                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1499                         ep->state, crq.crq.bRequestType,
1500                         crq.crq.bRequest); */
1501
1502                 if (crq.crq.bRequestType & USB_DIR_IN) {
1503                         /*
1504                          * The USB 2.0 spec states that "if wLength is
1505                          * zero, there is no data transfer phase."
1506                          * However, testusb #14 seems to actually
1507                          * expect a data phase even if wLength = 0...
1508                          */
1509                         ep->state = DATA_STAGE_IN;
1510                 } else {
1511                         if (crq.crq.wLength != __constant_cpu_to_le16(0))
1512                                 ep->state = DATA_STAGE_OUT;
1513                         else
1514                                 ep->state = STATUS_STAGE_IN;
1515                 }
1516
1517                 ret = -1;
1518                 if (ep->index == 0)
1519                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1520                 else {
1521                         spin_unlock(&udc->lock);
1522                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1523                         spin_lock(&udc->lock);
1524                 }
1525
1526                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1527                         crq.crq.bRequestType, crq.crq.bRequest,
1528                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1529
1530                 if (ret < 0) {
1531                         /* Let the host know that we failed */
1532                         set_protocol_stall(udc, ep);
1533                 }
1534         }
1535 }
1536
1537 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1538 {
1539         struct usba_request *req;
1540         u32 epstatus;
1541         u32 epctrl;
1542
1543         epstatus = usba_ep_readl(ep, STA);
1544         epctrl = usba_ep_readl(ep, CTL);
1545
1546         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1547
1548         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1549                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1550
1551                 if (list_empty(&ep->queue)) {
1552                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1553                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1554                         return;
1555                 }
1556
1557                 req = list_entry(ep->queue.next, struct usba_request, queue);
1558
1559                 if (req->using_dma) {
1560                         /* Send a zero-length packet */
1561                         usba_ep_writel(ep, SET_STA,
1562                                         USBA_TX_PK_RDY);
1563                         usba_ep_writel(ep, CTL_DIS,
1564                                         USBA_TX_PK_RDY);
1565                         list_del_init(&req->queue);
1566                         submit_next_request(ep);
1567                         request_complete(ep, req, 0);
1568                 } else {
1569                         if (req->submitted)
1570                                 next_fifo_transaction(ep, req);
1571                         else
1572                                 submit_request(ep, req);
1573
1574                         if (req->last_transaction) {
1575                                 list_del_init(&req->queue);
1576                                 submit_next_request(ep);
1577                                 request_complete(ep, req, 0);
1578                         }
1579                 }
1580
1581                 epstatus = usba_ep_readl(ep, STA);
1582                 epctrl = usba_ep_readl(ep, CTL);
1583         }
1584         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1585                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1586                 receive_data(ep);
1587                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1588         }
1589 }
1590
1591 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1592 {
1593         struct usba_request *req;
1594         u32 status, control, pending;
1595
1596         status = usba_dma_readl(ep, STATUS);
1597         control = usba_dma_readl(ep, CONTROL);
1598 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1599         ep->last_dma_status = status;
1600 #endif
1601         pending = status & control;
1602         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1603
1604         if (status & USBA_DMA_CH_EN) {
1605                 dev_err(&udc->pdev->dev,
1606                         "DMA_CH_EN is set after transfer is finished!\n");
1607                 dev_err(&udc->pdev->dev,
1608                         "status=%#08x, pending=%#08x, control=%#08x\n",
1609                         status, pending, control);
1610
1611                 /*
1612                  * try to pretend nothing happened. We might have to
1613                  * do something here...
1614                  */
1615         }
1616
1617         if (list_empty(&ep->queue))
1618                 /* Might happen if a reset comes along at the right moment */
1619                 return;
1620
1621         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1622                 req = list_entry(ep->queue.next, struct usba_request, queue);
1623                 usba_update_req(ep, req, status);
1624
1625                 list_del_init(&req->queue);
1626                 submit_next_request(ep);
1627                 request_complete(ep, req, 0);
1628         }
1629 }
1630
1631 static irqreturn_t usba_udc_irq(int irq, void *devid)
1632 {
1633         struct usba_udc *udc = devid;
1634         u32 status;
1635         u32 dma_status;
1636         u32 ep_status;
1637
1638         spin_lock(&udc->lock);
1639
1640         status = usba_readl(udc, INT_STA);
1641         DBG(DBG_INT, "irq, status=%#08x\n", status);
1642
1643         if (status & USBA_DET_SUSPEND) {
1644                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1645                 DBG(DBG_BUS, "Suspend detected\n");
1646                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1647                                 && udc->driver && udc->driver->suspend) {
1648                         spin_unlock(&udc->lock);
1649                         udc->driver->suspend(&udc->gadget);
1650                         spin_lock(&udc->lock);
1651                 }
1652         }
1653
1654         if (status & USBA_WAKE_UP) {
1655                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1656                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1657         }
1658
1659         if (status & USBA_END_OF_RESUME) {
1660                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1661                 DBG(DBG_BUS, "Resume detected\n");
1662                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1663                                 && udc->driver && udc->driver->resume) {
1664                         spin_unlock(&udc->lock);
1665                         udc->driver->resume(&udc->gadget);
1666                         spin_lock(&udc->lock);
1667                 }
1668         }
1669
1670         dma_status = USBA_BFEXT(DMA_INT, status);
1671         if (dma_status) {
1672                 int i;
1673
1674                 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1675                         if (dma_status & (1 << i))
1676                                 usba_dma_irq(udc, &usba_ep[i]);
1677         }
1678
1679         ep_status = USBA_BFEXT(EPT_INT, status);
1680         if (ep_status) {
1681                 int i;
1682
1683                 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1684                         if (ep_status & (1 << i)) {
1685                                 if (ep_is_control(&usba_ep[i]))
1686                                         usba_control_irq(udc, &usba_ep[i]);
1687                                 else
1688                                         usba_ep_irq(udc, &usba_ep[i]);
1689                         }
1690         }
1691
1692         if (status & USBA_END_OF_RESET) {
1693                 struct usba_ep *ep0;
1694
1695                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1696                 reset_all_endpoints(udc);
1697
1698                 if (status & USBA_HIGH_SPEED) {
1699                         DBG(DBG_BUS, "High-speed bus reset detected\n");
1700                         udc->gadget.speed = USB_SPEED_HIGH;
1701                 } else {
1702                         DBG(DBG_BUS, "Full-speed bus reset detected\n");
1703                         udc->gadget.speed = USB_SPEED_FULL;
1704                 }
1705
1706                 ep0 = &usba_ep[0];
1707                 ep0->desc = &usba_ep0_desc;
1708                 ep0->state = WAIT_FOR_SETUP;
1709                 usba_ep_writel(ep0, CFG,
1710                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1711                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1712                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1713                 usba_ep_writel(ep0, CTL_ENB,
1714                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1715                 usba_writel(udc, INT_ENB,
1716                                 (usba_readl(udc, INT_ENB)
1717                                 | USBA_BF(EPT_INT, 1)
1718                                 | USBA_DET_SUSPEND
1719                                 | USBA_END_OF_RESUME));
1720
1721                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1722                         dev_warn(&udc->pdev->dev,
1723                                  "WARNING: EP0 configuration is invalid!\n");
1724         }
1725
1726         spin_unlock(&udc->lock);
1727
1728         return IRQ_HANDLED;
1729 }
1730
1731 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1732 {
1733         struct usba_udc *udc = devid;
1734         int vbus;
1735
1736         /* debounce */
1737         udelay(10);
1738
1739         spin_lock(&udc->lock);
1740
1741         /* May happen if Vbus pin toggles during probe() */
1742         if (!udc->driver)
1743                 goto out;
1744
1745         vbus = gpio_get_value(udc->vbus_pin);
1746         if (vbus != udc->vbus_prev) {
1747                 if (vbus) {
1748                         usba_writel(udc, CTRL, USBA_EN_USBA);
1749                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1750                 } else {
1751                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1752                         reset_all_endpoints(udc);
1753                         usba_writel(udc, CTRL, 0);
1754                         spin_unlock(&udc->lock);
1755                         udc->driver->disconnect(&udc->gadget);
1756                         spin_lock(&udc->lock);
1757                 }
1758                 udc->vbus_prev = vbus;
1759         }
1760
1761 out:
1762         spin_unlock(&udc->lock);
1763
1764         return IRQ_HANDLED;
1765 }
1766
1767 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1768 {
1769         struct usba_udc *udc = &the_udc;
1770         unsigned long flags;
1771         int ret;
1772
1773         if (!udc->pdev)
1774                 return -ENODEV;
1775
1776         spin_lock_irqsave(&udc->lock, flags);
1777         if (udc->driver) {
1778                 spin_unlock_irqrestore(&udc->lock, flags);
1779                 return -EBUSY;
1780         }
1781
1782         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1783         udc->driver = driver;
1784         udc->gadget.dev.driver = &driver->driver;
1785         spin_unlock_irqrestore(&udc->lock, flags);
1786
1787         clk_enable(udc->pclk);
1788         clk_enable(udc->hclk);
1789
1790         ret = driver->bind(&udc->gadget);
1791         if (ret) {
1792                 DBG(DBG_ERR, "Could not bind to driver %s: error %d\n",
1793                         driver->driver.name, ret);
1794                 goto err_driver_bind;
1795         }
1796
1797         DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1798
1799         udc->vbus_prev = 0;
1800         if (udc->vbus_pin != -1)
1801                 enable_irq(gpio_to_irq(udc->vbus_pin));
1802
1803         /* If Vbus is present, enable the controller and wait for reset */
1804         spin_lock_irqsave(&udc->lock, flags);
1805         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1806                 usba_writel(udc, CTRL, USBA_EN_USBA);
1807                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1808         }
1809         spin_unlock_irqrestore(&udc->lock, flags);
1810
1811         return 0;
1812
1813 err_driver_bind:
1814         udc->driver = NULL;
1815         udc->gadget.dev.driver = NULL;
1816         return ret;
1817 }
1818 EXPORT_SYMBOL(usb_gadget_register_driver);
1819
1820 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1821 {
1822         struct usba_udc *udc = &the_udc;
1823         unsigned long flags;
1824
1825         if (!udc->pdev)
1826                 return -ENODEV;
1827         if (driver != udc->driver)
1828                 return -EINVAL;
1829
1830         if (udc->vbus_pin != -1)
1831                 disable_irq(gpio_to_irq(udc->vbus_pin));
1832
1833         spin_lock_irqsave(&udc->lock, flags);
1834         udc->gadget.speed = USB_SPEED_UNKNOWN;
1835         reset_all_endpoints(udc);
1836         spin_unlock_irqrestore(&udc->lock, flags);
1837
1838         /* This will also disable the DP pullup */
1839         usba_writel(udc, CTRL, 0);
1840
1841         driver->unbind(&udc->gadget);
1842         udc->gadget.dev.driver = NULL;
1843         udc->driver = NULL;
1844
1845         clk_disable(udc->hclk);
1846         clk_disable(udc->pclk);
1847
1848         DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1849
1850         return 0;
1851 }
1852 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1853
1854 static int __init usba_udc_probe(struct platform_device *pdev)
1855 {
1856         struct usba_platform_data *pdata = pdev->dev.platform_data;
1857         struct resource *regs, *fifo;
1858         struct clk *pclk, *hclk;
1859         struct usba_udc *udc = &the_udc;
1860         int irq, ret, i;
1861
1862         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1863         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1864         if (!regs || !fifo)
1865                 return -ENXIO;
1866
1867         irq = platform_get_irq(pdev, 0);
1868         if (irq < 0)
1869                 return irq;
1870
1871         pclk = clk_get(&pdev->dev, "pclk");
1872         if (IS_ERR(pclk))
1873                 return PTR_ERR(pclk);
1874         hclk = clk_get(&pdev->dev, "hclk");
1875         if (IS_ERR(hclk)) {
1876                 ret = PTR_ERR(hclk);
1877                 goto err_get_hclk;
1878         }
1879
1880         udc->pdev = pdev;
1881         udc->pclk = pclk;
1882         udc->hclk = hclk;
1883         udc->vbus_pin = -1;
1884
1885         ret = -ENOMEM;
1886         udc->regs = ioremap(regs->start, regs->end - regs->start + 1);
1887         if (!udc->regs) {
1888                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1889                 goto err_map_regs;
1890         }
1891         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1892                  (unsigned long)regs->start, udc->regs);
1893         udc->fifo = ioremap(fifo->start, fifo->end - fifo->start + 1);
1894         if (!udc->fifo) {
1895                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1896                 goto err_map_fifo;
1897         }
1898         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1899                  (unsigned long)fifo->start, udc->fifo);
1900
1901         device_initialize(&udc->gadget.dev);
1902         udc->gadget.dev.parent = &pdev->dev;
1903         udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1904
1905         platform_set_drvdata(pdev, udc);
1906
1907         /* Make sure we start from a clean slate */
1908         clk_enable(pclk);
1909         usba_writel(udc, CTRL, 0);
1910         clk_disable(pclk);
1911
1912         INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1913         usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1914         usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1915         usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1916         for (i = 1; i < ARRAY_SIZE(usba_ep); i++) {
1917                 struct usba_ep *ep = &usba_ep[i];
1918
1919                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1920                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1921                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1922
1923                 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1924         }
1925
1926         ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
1927         if (ret) {
1928                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
1929                         irq, ret);
1930                 goto err_request_irq;
1931         }
1932         udc->irq = irq;
1933
1934         ret = device_add(&udc->gadget.dev);
1935         if (ret) {
1936                 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
1937                 goto err_device_add;
1938         }
1939
1940         if (pdata && pdata->vbus_pin != GPIO_PIN_NONE) {
1941                 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
1942                         udc->vbus_pin = pdata->vbus_pin;
1943
1944                         ret = request_irq(gpio_to_irq(udc->vbus_pin),
1945                                         usba_vbus_irq, 0,
1946                                         "atmel_usba_udc", udc);
1947                         if (ret) {
1948                                 gpio_free(udc->vbus_pin);
1949                                 udc->vbus_pin = -1;
1950                                 dev_warn(&udc->pdev->dev,
1951                                          "failed to request vbus irq; "
1952                                          "assuming always on\n");
1953                         } else {
1954                                 disable_irq(gpio_to_irq(udc->vbus_pin));
1955                         }
1956                 }
1957         }
1958
1959         usba_init_debugfs(udc);
1960         for (i = 1; i < ARRAY_SIZE(usba_ep); i++)
1961                 usba_ep_init_debugfs(udc, &usba_ep[i]);
1962
1963         return 0;
1964
1965 err_device_add:
1966         free_irq(irq, udc);
1967 err_request_irq:
1968         iounmap(udc->fifo);
1969 err_map_fifo:
1970         iounmap(udc->regs);
1971 err_map_regs:
1972         clk_put(hclk);
1973 err_get_hclk:
1974         clk_put(pclk);
1975
1976         platform_set_drvdata(pdev, NULL);
1977
1978         return ret;
1979 }
1980
1981 static int __exit usba_udc_remove(struct platform_device *pdev)
1982 {
1983         struct usba_udc *udc;
1984         int i;
1985
1986         udc = platform_get_drvdata(pdev);
1987
1988         for (i = 1; i < ARRAY_SIZE(usba_ep); i++)
1989                 usba_ep_cleanup_debugfs(&usba_ep[i]);
1990         usba_cleanup_debugfs(udc);
1991
1992         if (udc->vbus_pin != -1)
1993                 gpio_free(udc->vbus_pin);
1994
1995         free_irq(udc->irq, udc);
1996         iounmap(udc->fifo);
1997         iounmap(udc->regs);
1998         clk_put(udc->hclk);
1999         clk_put(udc->pclk);
2000
2001         device_unregister(&udc->gadget.dev);
2002
2003         return 0;
2004 }
2005
2006 static struct platform_driver udc_driver = {
2007         .remove         = __exit_p(usba_udc_remove),
2008         .driver         = {
2009                 .name           = "atmel_usba_udc",
2010         },
2011 };
2012
2013 static int __init udc_init(void)
2014 {
2015         return platform_driver_probe(&udc_driver, usba_udc_probe);
2016 }
2017 module_init(udc_init);
2018
2019 static void __exit udc_exit(void)
2020 {
2021         platform_driver_unregister(&udc_driver);
2022 }
2023 module_exit(udc_exit);
2024
2025 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2026 MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
2027 MODULE_LICENSE("GPL");