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/slab.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/list.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/usb/ch9.h>
  21 #include <linux/usb/gadget.h>
  22 #include <linux/usb/atmel_usba_udc.h>
  23 #include <linux/delay.h>
  24
  25 #include <asm/gpio.h>
  26 #include <mach/board.h>
  27
  28 #include "atmel_usba_udc.h"
  29
  30
  31 static struct usba_udc the_udc;
  32 static struct usba_ep *usba_ep;
  33
  34 #ifdef CONFIG_USB_GADGET_DEBUG_FS
  35 #include <linux/debugfs.h>
  36 #include <linux/uaccess.h>
  37
  38 static int queue_dbg_open(struct inode *inode, struct file *file)
  39 {
  40         struct usba_ep *ep = inode->i_private;
  41         struct usba_request *req, *req_copy;
  42         struct list_head *queue_data;
  43
  44         queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
  45         if (!queue_data)
  46                 return -ENOMEM;
  47         INIT_LIST_HEAD(queue_data);
  48
  49         spin_lock_irq(&ep->udc->lock);
  50         list_for_each_entry(req, &ep->queue, queue) {
  51                 req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
  52                 if (!req_copy)
  53                         goto fail;
  54                 list_add_tail(&req_copy->queue, queue_data);
  55         }
  56         spin_unlock_irq(&ep->udc->lock);
  57
  58         file->private_data = queue_data;
  59         return 0;
  60
  61 fail:
  62         spin_unlock_irq(&ep->udc->lock);
  63         list_for_each_entry_safe(req, req_copy, queue_data, queue) {
  64                 list_del(&req->queue);
  65                 kfree(req);
  66         }
  67         kfree(queue_data);
  68         return -ENOMEM;
  69 }
  70
  71 /*
  72  * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
  73  *
  74  * b: buffer address
  75  * l: buffer length
  76  * I/i: interrupt/no interrupt
  77  * Z/z: zero/no zero
  78  * S/s: short ok/short not ok
  79  * s: status
  80  * n: nr_packets
  81  * F/f: submitted/not submitted to FIFO
  82  * D/d: using/not using DMA
  83  * L/l: last transaction/not last transaction
  84  */
  85 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
  86                 size_t nbytes, loff_t *ppos)
  87 {
  88         struct list_head *queue = file->private_data;
  89         struct usba_request *req, *tmp_req;
  90         size_t len, remaining, actual = 0;
  91         char tmpbuf[38];
  92
  93         if (!access_ok(VERIFY_WRITE, buf, nbytes))
  94                 return -EFAULT;
  95
  96         mutex_lock(&file->f_dentry->d_inode->i_mutex);
  97         list_for_each_entry_safe(req, tmp_req, queue, queue) {
  98                 len = snprintf(tmpbuf, sizeof(tmpbuf),
  99                                 "%8p %08x %c%c%c %5d %c%c%c\n",
 100                                 req->req.buf, req->req.length,
 101                                 req->req.no_interrupt ? 'i' : 'I',
 102                                 req->req.zero ? 'Z' : 'z',
 103                                 req->req.short_not_ok ? 's' : 'S',
 104                                 req->req.status,
 105                                 req->submitted ? 'F' : 'f',
 106                                 req->using_dma ? 'D' : 'd',
 107                                 req->last_transaction ? 'L' : 'l');
 108                 len = min(len, sizeof(tmpbuf));
 109                 if (len > nbytes)
 110                         break;
 111
 112                 list_del(&req->queue);
 113                 kfree(req);
 114
 115                 remaining = __copy_to_user(buf, tmpbuf, len);
 116                 actual += len - remaining;
 117                 if (remaining)
 118                         break;
 119
 120                 nbytes -= len;
 121                 buf += len;
 122         }
 123         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 124
 125         return actual;
 126 }
 127
 128 static int queue_dbg_release(struct inode *inode, struct file *file)
 129 {
 130         struct list_head *queue_data = file->private_data;
 131         struct usba_request *req, *tmp_req;
 132
 133         list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
 134                 list_del(&req->queue);
 135                 kfree(req);
 136         }
 137         kfree(queue_data);
 138         return 0;
 139 }
 140
 141 static int regs_dbg_open(struct inode *inode, struct file *file)
 142 {
 143         struct usba_udc *udc;
 144         unsigned int i;
 145         u32 *data;
 146         int ret = -ENOMEM;
 147
 148         mutex_lock(&inode->i_mutex);
 149         udc = inode->i_private;
 150         data = kmalloc(inode->i_size, GFP_KERNEL);
 151         if (!data)
 152                 goto out;
 153
 154         spin_lock_irq(&udc->lock);
 155         for (i = 0; i < inode->i_size / 4; i++)
 156                 data[i] = __raw_readl(udc->regs + i * 4);
 157         spin_unlock_irq(&udc->lock);
 158
 159         file->private_data = data;
 160         ret = 0;
 161
 162 out:
 163         mutex_unlock(&inode->i_mutex);
 164
 165         return ret;
 166 }
 167
 168 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
 169                 size_t nbytes, loff_t *ppos)
 170 {
 171         struct inode *inode = file->f_dentry->d_inode;
 172         int ret;
 173
 174         mutex_lock(&inode->i_mutex);
 175         ret = simple_read_from_buffer(buf, nbytes, ppos,
 176                         file->private_data,
 177                         file->f_dentry->d_inode->i_size);
 178         mutex_unlock(&inode->i_mutex);
 179
 180         return ret;
 181 }
 182
 183 static int regs_dbg_release(struct inode *inode, struct file *file)
 184 {
 185         kfree(file->private_data);
 186         return 0;
 187 }
 188
 189 const struct file_operations queue_dbg_fops = {
 190         .owner          = THIS_MODULE,
 191         .open           = queue_dbg_open,
 192         .llseek         = no_llseek,
 193         .read           = queue_dbg_read,
 194         .release        = queue_dbg_release,
 195 };
 196
 197 const struct file_operations regs_dbg_fops = {
 198         .owner          = THIS_MODULE,
 199         .open           = regs_dbg_open,
 200         .llseek         = generic_file_llseek,
 201         .read           = regs_dbg_read,
 202         .release        = regs_dbg_release,
 203 };
 204
 205 static void usba_ep_init_debugfs(struct usba_udc *udc,
 206                 struct usba_ep *ep)
 207 {
 208         struct dentry *ep_root;
 209
 210         ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
 211         if (!ep_root)
 212                 goto err_root;
 213         ep->debugfs_dir = ep_root;
 214
 215         ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
 216                                                 ep, &queue_dbg_fops);
 217         if (!ep->debugfs_queue)
 218                 goto err_queue;
 219
 220         if (ep->can_dma) {
 221                 ep->debugfs_dma_status
 222                         = debugfs_create_u32("dma_status", 0400, ep_root,
 223                                         &ep->last_dma_status);
 224                 if (!ep->debugfs_dma_status)
 225                         goto err_dma_status;
 226         }
 227         if (ep_is_control(ep)) {
 228                 ep->debugfs_state
 229                         = debugfs_create_u32("state", 0400, ep_root,
 230                                         &ep->state);
 231                 if (!ep->debugfs_state)
 232                         goto err_state;
 233         }
 234
 235         return;
 236
 237 err_state:
 238         if (ep->can_dma)
 239                 debugfs_remove(ep->debugfs_dma_status);
 240 err_dma_status:
 241         debugfs_remove(ep->debugfs_queue);
 242 err_queue:
 243         debugfs_remove(ep_root);
 244 err_root:
 245         dev_err(&ep->udc->pdev->dev,
 246                 "failed to create debugfs directory for %s\n", ep->ep.name);
 247 }
 248
 249 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 250 {
 251         debugfs_remove(ep->debugfs_queue);
 252         debugfs_remove(ep->debugfs_dma_status);
 253         debugfs_remove(ep->debugfs_state);
 254         debugfs_remove(ep->debugfs_dir);
 255         ep->debugfs_dma_status = NULL;
 256         ep->debugfs_dir = NULL;
 257 }
 258
 259 static void usba_init_debugfs(struct usba_udc *udc)
 260 {
 261         struct dentry *root, *regs;
 262         struct resource *regs_resource;
 263
 264         root = debugfs_create_dir(udc->gadget.name, NULL);
 265         if (IS_ERR(root) || !root)
 266                 goto err_root;
 267         udc->debugfs_root = root;
 268
 269         regs = debugfs_create_file("regs", 0400, root, udc, &regs_dbg_fops);
 270         if (!regs)
 271                 goto err_regs;
 272
 273         regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
 274                                 CTRL_IOMEM_ID);
 275         regs->d_inode->i_size = resource_size(regs_resource);
 276         udc->debugfs_regs = regs;
 277
 278         usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
 279
 280         return;
 281
 282 err_regs:
 283         debugfs_remove(root);
 284 err_root:
 285         udc->debugfs_root = NULL;
 286         dev_err(&udc->pdev->dev, "debugfs is not available\n");
 287 }
 288
 289 static void usba_cleanup_debugfs(struct usba_udc *udc)
 290 {
 291         usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
 292         debugfs_remove(udc->debugfs_regs);
 293         debugfs_remove(udc->debugfs_root);
 294         udc->debugfs_regs = NULL;
 295         udc->debugfs_root = NULL;
 296 }
 297 #else
 298 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
 299                                          struct usba_ep *ep)
 300 {
 301
 302 }
 303
 304 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 305 {
 306
 307 }
 308
 309 static inline void usba_init_debugfs(struct usba_udc *udc)
 310 {
 311
 312 }
 313
 314 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
 315 {
 316
 317 }
 318 #endif
 319
 320 static int vbus_is_present(struct usba_udc *udc)
 321 {
 322         if (gpio_is_valid(udc->vbus_pin))
 323                 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
 324
 325         /* No Vbus detection: Assume always present */
 326         return 1;
 327 }
 328
 329 #if defined(CONFIG_ARCH_AT91SAM9RL)
 330
 331 #include <mach/at91_pmc.h>
 332
 333 static void toggle_bias(int is_on)
 334 {
 335         unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
 336
 337         if (is_on)
 338                 at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
 339         else
 340                 at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
 341 }
 342
 343 #else
 344
 345 static void toggle_bias(int is_on)
 346 {
 347 }
 348
 349 #endif /* CONFIG_ARCH_AT91SAM9RL */
 350
 351 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 352 {
 353         unsigned int transaction_len;
 354
 355         transaction_len = req->req.length - req->req.actual;
 356         req->last_transaction = 1;
 357         if (transaction_len > ep->ep.maxpacket) {
 358                 transaction_len = ep->ep.maxpacket;
 359                 req->last_transaction = 0;
 360         } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
 361                 req->last_transaction = 0;
 362
 363         DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
 364                 ep->ep.name, req, transaction_len,
 365                 req->last_transaction ? ", done" : "");
 366
 367         memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
 368         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 369         req->req.actual += transaction_len;
 370 }
 371
 372 static void submit_request(struct usba_ep *ep, struct usba_request *req)
 373 {
 374         DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
 375                 ep->ep.name, req, req->req.length);
 376
 377         req->req.actual = 0;
 378         req->submitted = 1;
 379
 380         if (req->using_dma) {
 381                 if (req->req.length == 0) {
 382                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 383                         return;
 384                 }
 385
 386                 if (req->req.zero)
 387                         usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
 388                 else
 389                         usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
 390
 391                 usba_dma_writel(ep, ADDRESS, req->req.dma);
 392                 usba_dma_writel(ep, CONTROL, req->ctrl);
 393         } else {
 394                 next_fifo_transaction(ep, req);
 395                 if (req->last_transaction) {
 396                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
 397                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 398                 } else {
 399                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
 400                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 401                 }
 402         }
 403 }
 404
 405 static void submit_next_request(struct usba_ep *ep)
 406 {
 407         struct usba_request *req;
 408
 409         if (list_empty(&ep->queue)) {
 410                 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
 411                 return;
 412         }
 413
 414         req = list_entry(ep->queue.next, struct usba_request, queue);
 415         if (!req->submitted)
 416                 submit_request(ep, req);
 417 }
 418
 419 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
 420 {
 421         ep->state = STATUS_STAGE_IN;
 422         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 423         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 424 }
 425
 426 static void receive_data(struct usba_ep *ep)
 427 {
 428         struct usba_udc *udc = ep->udc;
 429         struct usba_request *req;
 430         unsigned long status;
 431         unsigned int bytecount, nr_busy;
 432         int is_complete = 0;
 433
 434         status = usba_ep_readl(ep, STA);
 435         nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 436
 437         DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
 438
 439         while (nr_busy > 0) {
 440                 if (list_empty(&ep->queue)) {
 441                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 442                         break;
 443                 }
 444                 req = list_entry(ep->queue.next,
 445                                  struct usba_request, queue);
 446
 447                 bytecount = USBA_BFEXT(BYTE_COUNT, status);
 448
 449                 if (status & (1 << 31))
 450                         is_complete = 1;
 451                 if (req->req.actual + bytecount >= req->req.length) {
 452                         is_complete = 1;
 453                         bytecount = req->req.length - req->req.actual;
 454                 }
 455
 456                 memcpy_fromio(req->req.buf + req->req.actual,
 457                                 ep->fifo, bytecount);
 458                 req->req.actual += bytecount;
 459
 460                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
 461
 462                 if (is_complete) {
 463                         DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
 464                         req->req.status = 0;
 465                         list_del_init(&req->queue);
 466                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 467                         spin_unlock(&udc->lock);
 468                         req->req.complete(&ep->ep, &req->req);
 469                         spin_lock(&udc->lock);
 470                 }
 471
 472                 status = usba_ep_readl(ep, STA);
 473                 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 474
 475                 if (is_complete && ep_is_control(ep)) {
 476                         send_status(udc, ep);
 477                         break;
 478                 }
 479         }
 480 }
 481
 482 static void
 483 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
 484 {
 485         struct usba_udc *udc = ep->udc;
 486
 487         WARN_ON(!list_empty(&req->queue));
 488
 489         if (req->req.status == -EINPROGRESS)
 490                 req->req.status = status;
 491
 492         if (req->mapped) {
 493                 dma_unmap_single(
 494                         &udc->pdev->dev, req->req.dma, req->req.length,
 495                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 496                 req->req.dma = DMA_ADDR_INVALID;
 497                 req->mapped = 0;
 498         }
 499
 500         DBG(DBG_GADGET | DBG_REQ,
 501                 "%s: req %p complete: status %d, actual %u\n",
 502                 ep->ep.name, req, req->req.status, req->req.actual);
 503
 504         spin_unlock(&udc->lock);
 505         req->req.complete(&ep->ep, &req->req);
 506         spin_lock(&udc->lock);
 507 }
 508
 509 static void
 510 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
 511 {
 512         struct usba_request *req, *tmp_req;
 513
 514         list_for_each_entry_safe(req, tmp_req, list, queue) {
 515                 list_del_init(&req->queue);
 516                 request_complete(ep, req, status);
 517         }
 518 }
 519
 520 static int
 521 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 522 {
 523         struct usba_ep *ep = to_usba_ep(_ep);
 524         struct usba_udc *udc = ep->udc;
 525         unsigned long flags, ept_cfg, maxpacket;
 526         unsigned int nr_trans;
 527
 528         DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
 529
 530         maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
 531
 532         if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
 533                         || ep->index == 0
 534                         || desc->bDescriptorType != USB_DT_ENDPOINT
 535                         || maxpacket == 0
 536                         || maxpacket > ep->fifo_size) {
 537                 DBG(DBG_ERR, "ep_enable: Invalid argument");
 538                 return -EINVAL;
 539         }
 540
 541         ep->is_isoc = 0;
 542         ep->is_in = 0;
 543
 544         if (maxpacket <= 8)
 545                 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
 546         else
 547                 /* LSB is bit 1, not 0 */
 548                 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
 549
 550         DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
 551                         ep->ep.name, ept_cfg, maxpacket);
 552
 553         if (usb_endpoint_dir_in(desc)) {
 554                 ep->is_in = 1;
 555                 ept_cfg |= USBA_EPT_DIR_IN;
 556         }
 557
 558         switch (usb_endpoint_type(desc)) {
 559         case USB_ENDPOINT_XFER_CONTROL:
 560                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 561                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
 562                 break;
 563         case USB_ENDPOINT_XFER_ISOC:
 564                 if (!ep->can_isoc) {
 565                         DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
 566                                         ep->ep.name);
 567                         return -EINVAL;
 568                 }
 569
 570                 /*
 571                  * Bits 11:12 specify number of _additional_
 572                  * transactions per microframe.
 573                  */
 574                 nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
 575                 if (nr_trans > 3)
 576                         return -EINVAL;
 577
 578                 ep->is_isoc = 1;
 579                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 580
 581                 /*
 582                  * Do triple-buffering on high-bandwidth iso endpoints.
 583                  */
 584                 if (nr_trans > 1 && ep->nr_banks == 3)
 585                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
 586                 else
 587                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 588                 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 589                 break;
 590         case USB_ENDPOINT_XFER_BULK:
 591                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 592                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 593                 break;
 594         case USB_ENDPOINT_XFER_INT:
 595                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 596                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 597                 break;
 598         }
 599
 600         spin_lock_irqsave(&ep->udc->lock, flags);
 601
 602         if (ep->desc) {
 603                 spin_unlock_irqrestore(&ep->udc->lock, flags);
 604                 DBG(DBG_ERR, "ep%d already enabled\n", ep->index);
 605                 return -EBUSY;
 606         }
 607
 608         ep->desc = desc;
 609         ep->ep.maxpacket = maxpacket;
 610
 611         usba_ep_writel(ep, CFG, ept_cfg);
 612         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 613
 614         if (ep->can_dma) {
 615                 u32 ctrl;
 616
 617                 usba_writel(udc, INT_ENB,
 618                                 (usba_readl(udc, INT_ENB)
 619                                         | USBA_BF(EPT_INT, 1 << ep->index)
 620                                         | USBA_BF(DMA_INT, 1 << ep->index)));
 621                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 622                 usba_ep_writel(ep, CTL_ENB, ctrl);
 623         } else {
 624                 usba_writel(udc, INT_ENB,
 625                                 (usba_readl(udc, INT_ENB)
 626                                         | USBA_BF(EPT_INT, 1 << ep->index)));
 627         }
 628
 629         spin_unlock_irqrestore(&udc->lock, flags);
 630
 631         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 632                         (unsigned long)usba_ep_readl(ep, CFG));
 633         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 634                         (unsigned long)usba_readl(udc, INT_ENB));
 635
 636         return 0;
 637 }
 638
 639 static int usba_ep_disable(struct usb_ep *_ep)
 640 {
 641         struct usba_ep *ep = to_usba_ep(_ep);
 642         struct usba_udc *udc = ep->udc;
 643         LIST_HEAD(req_list);
 644         unsigned long flags;
 645
 646         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 647
 648         spin_lock_irqsave(&udc->lock, flags);
 649
 650         if (!ep->desc) {
 651                 spin_unlock_irqrestore(&udc->lock, flags);
 652                 /* REVISIT because this driver disables endpoints in
 653                  * reset_all_endpoints() before calling disconnect(),
 654                  * most gadget drivers would trigger this non-error ...
 655                  */
 656                 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
 657                         DBG(DBG_ERR, "ep_disable: %s not enabled\n",
 658                                         ep->ep.name);
 659                 return -EINVAL;
 660         }
 661         ep->desc = NULL;
 662         ep->ep.desc = NULL;
 663
 664         list_splice_init(&ep->queue, &req_list);
 665         if (ep->can_dma) {
 666                 usba_dma_writel(ep, CONTROL, 0);
 667                 usba_dma_writel(ep, ADDRESS, 0);
 668                 usba_dma_readl(ep, STATUS);
 669         }
 670         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 671         usba_writel(udc, INT_ENB,
 672                         usba_readl(udc, INT_ENB)
 673                         & ~USBA_BF(EPT_INT, 1 << ep->index));
 674
 675         request_complete_list(ep, &req_list, -ESHUTDOWN);
 676
 677         spin_unlock_irqrestore(&udc->lock, flags);
 678
 679         return 0;
 680 }
 681
 682 static struct usb_request *
 683 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 684 {
 685         struct usba_request *req;
 686
 687         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 688
 689         req = kzalloc(sizeof(*req), gfp_flags);
 690         if (!req)
 691                 return NULL;
 692
 693         INIT_LIST_HEAD(&req->queue);
 694         req->req.dma = DMA_ADDR_INVALID;
 695
 696         return &req->req;
 697 }
 698
 699 static void
 700 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 701 {
 702         struct usba_request *req = to_usba_req(_req);
 703
 704         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 705
 706         kfree(req);
 707 }
 708
 709 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 710                 struct usba_request *req, gfp_t gfp_flags)
 711 {
 712         unsigned long flags;
 713         int ret;
 714
 715         DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
 716                 ep->ep.name, req->req.length, req->req.dma,
 717                 req->req.zero ? 'Z' : 'z',
 718                 req->req.short_not_ok ? 'S' : 's',
 719                 req->req.no_interrupt ? 'I' : 'i');
 720
 721         if (req->req.length > 0x10000) {
 722                 /* Lengths from 0 to 65536 (inclusive) are supported */
 723                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 724                 return -EINVAL;
 725         }
 726
 727         req->using_dma = 1;
 728
 729         if (req->req.dma == DMA_ADDR_INVALID) {
 730                 req->req.dma = dma_map_single(
 731                         &udc->pdev->dev, req->req.buf, req->req.length,
 732                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 733                 req->mapped = 1;
 734         } else {
 735                 dma_sync_single_for_device(
 736                         &udc->pdev->dev, req->req.dma, req->req.length,
 737                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 738                 req->mapped = 0;
 739         }
 740
 741         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 742                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 743                         | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 744
 745         if (ep->is_in)
 746                 req->ctrl |= USBA_DMA_END_BUF_EN;
 747
 748         /*
 749          * Add this request to the queue and submit for DMA if
 750          * possible. Check if we're still alive first -- we may have
 751          * received a reset since last time we checked.
 752          */
 753         ret = -ESHUTDOWN;
 754         spin_lock_irqsave(&udc->lock, flags);
 755         if (ep->desc) {
 756                 if (list_empty(&ep->queue))
 757                         submit_request(ep, req);
 758
 759                 list_add_tail(&req->queue, &ep->queue);
 760                 ret = 0;
 761         }
 762         spin_unlock_irqrestore(&udc->lock, flags);
 763
 764         return ret;
 765 }
 766
 767 static int
 768 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 769 {
 770         struct usba_request *req = to_usba_req(_req);
 771         struct usba_ep *ep = to_usba_ep(_ep);
 772         struct usba_udc *udc = ep->udc;
 773         unsigned long flags;
 774         int ret;
 775
 776         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 777                         ep->ep.name, req, _req->length);
 778
 779         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN || !ep->desc)
 780                 return -ESHUTDOWN;
 781
 782         req->submitted = 0;
 783         req->using_dma = 0;
 784         req->last_transaction = 0;
 785
 786         _req->status = -EINPROGRESS;
 787         _req->actual = 0;
 788
 789         if (ep->can_dma)
 790                 return queue_dma(udc, ep, req, gfp_flags);
 791
 792         /* May have received a reset since last time we checked */
 793         ret = -ESHUTDOWN;
 794         spin_lock_irqsave(&udc->lock, flags);
 795         if (ep->desc) {
 796                 list_add_tail(&req->queue, &ep->queue);
 797
 798                 if ((!ep_is_control(ep) && ep->is_in) ||
 799                         (ep_is_control(ep)
 800                                 && (ep->state == DATA_STAGE_IN
 801                                         || ep->state == STATUS_STAGE_IN)))
 802                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 803                 else
 804                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 805                 ret = 0;
 806         }
 807         spin_unlock_irqrestore(&udc->lock, flags);
 808
 809         return ret;
 810 }
 811
 812 static void
 813 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 814 {
 815         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 816 }
 817
 818 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 819 {
 820         unsigned int timeout;
 821         u32 status;
 822
 823         /*
 824          * Stop the DMA controller. When writing both CH_EN
 825          * and LINK to 0, the other bits are not affected.
 826          */
 827         usba_dma_writel(ep, CONTROL, 0);
 828
 829         /* Wait for the FIFO to empty */
 830         for (timeout = 40; timeout; --timeout) {
 831                 status = usba_dma_readl(ep, STATUS);
 832                 if (!(status & USBA_DMA_CH_EN))
 833                         break;
 834                 udelay(1);
 835         }
 836
 837         if (pstatus)
 838                 *pstatus = status;
 839
 840         if (timeout == 0) {
 841                 dev_err(&ep->udc->pdev->dev,
 842                         "%s: timed out waiting for DMA FIFO to empty\n",
 843                         ep->ep.name);
 844                 return -ETIMEDOUT;
 845         }
 846
 847         return 0;
 848 }
 849
 850 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 851 {
 852         struct usba_ep *ep = to_usba_ep(_ep);
 853         struct usba_udc *udc = ep->udc;
 854         struct usba_request *req = to_usba_req(_req);
 855         unsigned long flags;
 856         u32 status;
 857
 858         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 859                         ep->ep.name, req);
 860
 861         spin_lock_irqsave(&udc->lock, flags);
 862
 863         if (req->using_dma) {
 864                 /*
 865                  * If this request is currently being transferred,
 866                  * stop the DMA controller and reset the FIFO.
 867                  */
 868                 if (ep->queue.next == &req->queue) {
 869                         status = usba_dma_readl(ep, STATUS);
 870                         if (status & USBA_DMA_CH_EN)
 871                                 stop_dma(ep, &status);
 872
 873 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 874                         ep->last_dma_status = status;
 875 #endif
 876
 877                         usba_writel(udc, EPT_RST, 1 << ep->index);
 878
 879                         usba_update_req(ep, req, status);
 880                 }
 881         }
 882
 883         /*
 884          * Errors should stop the queue from advancing until the
 885          * completion function returns.
 886          */
 887         list_del_init(&req->queue);
 888
 889         request_complete(ep, req, -ECONNRESET);
 890
 891         /* Process the next request if any */
 892         submit_next_request(ep);
 893         spin_unlock_irqrestore(&udc->lock, flags);
 894
 895         return 0;
 896 }
 897
 898 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 899 {
 900         struct usba_ep *ep = to_usba_ep(_ep);
 901         struct usba_udc *udc = ep->udc;
 902         unsigned long flags;
 903         int ret = 0;
 904
 905         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 906                         value ? "set" : "clear");
 907
 908         if (!ep->desc) {
 909                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 910                                 ep->ep.name);
 911                 return -ENODEV;
 912         }
 913         if (ep->is_isoc) {
 914                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 915                                 ep->ep.name);
 916                 return -ENOTTY;
 917         }
 918
 919         spin_lock_irqsave(&udc->lock, flags);
 920
 921         /*
 922          * We can't halt IN endpoints while there are still data to be
 923          * transferred
 924          */
 925         if (!list_empty(&ep->queue)
 926                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 927                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 928                 ret = -EAGAIN;
 929         } else {
 930                 if (value)
 931                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 932                 else
 933                         usba_ep_writel(ep, CLR_STA,
 934                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 935                 usba_ep_readl(ep, STA);
 936         }
 937
 938         spin_unlock_irqrestore(&udc->lock, flags);
 939
 940         return ret;
 941 }
 942
 943 static int usba_ep_fifo_status(struct usb_ep *_ep)
 944 {
 945         struct usba_ep *ep = to_usba_ep(_ep);
 946
 947         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 948 }
 949
 950 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 951 {
 952         struct usba_ep *ep = to_usba_ep(_ep);
 953         struct usba_udc *udc = ep->udc;
 954
 955         usba_writel(udc, EPT_RST, 1 << ep->index);
 956 }
 957
 958 static const struct usb_ep_ops usba_ep_ops = {
 959         .enable         = usba_ep_enable,
 960         .disable        = usba_ep_disable,
 961         .alloc_request  = usba_ep_alloc_request,
 962         .free_request   = usba_ep_free_request,
 963         .queue          = usba_ep_queue,
 964         .dequeue        = usba_ep_dequeue,
 965         .set_halt       = usba_ep_set_halt,
 966         .fifo_status    = usba_ep_fifo_status,
 967         .fifo_flush     = usba_ep_fifo_flush,
 968 };
 969
 970 static int usba_udc_get_frame(struct usb_gadget *gadget)
 971 {
 972         struct usba_udc *udc = to_usba_udc(gadget);
 973
 974         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 975 }
 976
 977 static int usba_udc_wakeup(struct usb_gadget *gadget)
 978 {
 979         struct usba_udc *udc = to_usba_udc(gadget);
 980         unsigned long flags;
 981         u32 ctrl;
 982         int ret = -EINVAL;
 983
 984         spin_lock_irqsave(&udc->lock, flags);
 985         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 986                 ctrl = usba_readl(udc, CTRL);
 987                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 988                 ret = 0;
 989         }
 990         spin_unlock_irqrestore(&udc->lock, flags);
 991
 992         return ret;
 993 }
 994
 995 static int
 996 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 997 {
 998         struct usba_udc *udc = to_usba_udc(gadget);
 999         unsigned long flags;
1000
1001         spin_lock_irqsave(&udc->lock, flags);
1002         if (is_selfpowered)
1003                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1004         else
1005                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1006         spin_unlock_irqrestore(&udc->lock, flags);
1007
1008         return 0;
1009 }
1010
1011 static int atmel_usba_start(struct usb_gadget_driver *driver,
1012                 int (*bind)(struct usb_gadget *));
1013 static int atmel_usba_stop(struct usb_gadget_driver *driver);
1014
1015 static const struct usb_gadget_ops usba_udc_ops = {
1016         .get_frame              = usba_udc_get_frame,
1017         .wakeup                 = usba_udc_wakeup,
1018         .set_selfpowered        = usba_udc_set_selfpowered,
1019         .start                  = atmel_usba_start,
1020         .stop                   = atmel_usba_stop,
1021 };
1022
1023 static struct usb_endpoint_descriptor usba_ep0_desc = {
1024         .bLength = USB_DT_ENDPOINT_SIZE,
1025         .bDescriptorType = USB_DT_ENDPOINT,
1026         .bEndpointAddress = 0,
1027         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1028         .wMaxPacketSize = cpu_to_le16(64),
1029         /* FIXME: I have no idea what to put here */
1030         .bInterval = 1,
1031 };
1032
1033 static void nop_release(struct device *dev)
1034 {
1035
1036 }
1037
1038 static struct usba_udc the_udc = {
1039         .gadget = {
1040                 .ops            = &usba_udc_ops,
1041                 .ep_list        = LIST_HEAD_INIT(the_udc.gadget.ep_list),
1042                 .max_speed      = USB_SPEED_HIGH,
1043                 .name           = "atmel_usba_udc",
1044                 .dev    = {
1045                         .init_name      = "gadget",
1046                         .release        = nop_release,
1047                 },
1048         },
1049 };
1050
1051 /*
1052  * Called with interrupts disabled and udc->lock held.
1053  */
1054 static void reset_all_endpoints(struct usba_udc *udc)
1055 {
1056         struct usba_ep *ep;
1057         struct usba_request *req, *tmp_req;
1058
1059         usba_writel(udc, EPT_RST, ~0UL);
1060
1061         ep = to_usba_ep(udc->gadget.ep0);
1062         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1063                 list_del_init(&req->queue);
1064                 request_complete(ep, req, -ECONNRESET);
1065         }
1066
1067         /* NOTE:  normally, the next call to the gadget driver is in
1068          * charge of disabling endpoints... usually disconnect().
1069          * The exception would be entering a high speed test mode.
1070          *
1071          * FIXME remove this code ... and retest thoroughly.
1072          */
1073         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1074                 if (ep->desc) {
1075                         spin_unlock(&udc->lock);
1076                         usba_ep_disable(&ep->ep);
1077                         spin_lock(&udc->lock);
1078                 }
1079         }
1080 }
1081
1082 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1083 {
1084         struct usba_ep *ep;
1085
1086         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1087                 return to_usba_ep(udc->gadget.ep0);
1088
1089         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1090                 u8 bEndpointAddress;
1091
1092                 if (!ep->desc)
1093                         continue;
1094                 bEndpointAddress = ep->desc->bEndpointAddress;
1095                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1096                         continue;
1097                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1098                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1099                         return ep;
1100         }
1101
1102         return NULL;
1103 }
1104
1105 /* Called with interrupts disabled and udc->lock held */
1106 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1107 {
1108         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1109         ep->state = WAIT_FOR_SETUP;
1110 }
1111
1112 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1113 {
1114         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1115                 return 1;
1116         return 0;
1117 }
1118
1119 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1120 {
1121         u32 regval;
1122
1123         DBG(DBG_BUS, "setting address %u...\n", addr);
1124         regval = usba_readl(udc, CTRL);
1125         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1126         usba_writel(udc, CTRL, regval);
1127 }
1128
1129 static int do_test_mode(struct usba_udc *udc)
1130 {
1131         static const char test_packet_buffer[] = {
1132                 /* JKJKJKJK * 9 */
1133                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1134                 /* JJKKJJKK * 8 */
1135                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1136                 /* JJKKJJKK * 8 */
1137                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1138                 /* JJJJJJJKKKKKKK * 8 */
1139                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1140                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1141                 /* JJJJJJJK * 8 */
1142                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1143                 /* {JKKKKKKK * 10}, JK */
1144                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1145         };
1146         struct usba_ep *ep;
1147         struct device *dev = &udc->pdev->dev;
1148         int test_mode;
1149
1150         test_mode = udc->test_mode;
1151
1152         /* Start from a clean slate */
1153         reset_all_endpoints(udc);
1154
1155         switch (test_mode) {
1156         case 0x0100:
1157                 /* Test_J */
1158                 usba_writel(udc, TST, USBA_TST_J_MODE);
1159                 dev_info(dev, "Entering Test_J mode...\n");
1160                 break;
1161         case 0x0200:
1162                 /* Test_K */
1163                 usba_writel(udc, TST, USBA_TST_K_MODE);
1164                 dev_info(dev, "Entering Test_K mode...\n");
1165                 break;
1166         case 0x0300:
1167                 /*
1168                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1169                  * for Bulk IN transfers
1170                  */
1171                 ep = &usba_ep[0];
1172                 usba_writel(udc, TST,
1173                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1174                 usba_ep_writel(ep, CFG,
1175                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1176                                 | USBA_EPT_DIR_IN
1177                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1178                                 | USBA_BF(BK_NUMBER, 1));
1179                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1180                         set_protocol_stall(udc, ep);
1181                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1182                 } else {
1183                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1184                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1185                 }
1186                 break;
1187         case 0x0400:
1188                 /* Test_Packet */
1189                 ep = &usba_ep[0];
1190                 usba_ep_writel(ep, CFG,
1191                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1192                                 | USBA_EPT_DIR_IN
1193                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1194                                 | USBA_BF(BK_NUMBER, 1));
1195                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1196                         set_protocol_stall(udc, ep);
1197                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1198                 } else {
1199                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1200                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1201                         memcpy_toio(ep->fifo, test_packet_buffer,
1202                                         sizeof(test_packet_buffer));
1203                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1204                         dev_info(dev, "Entering Test_Packet mode...\n");
1205                 }
1206                 break;
1207         default:
1208                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1209                 return -EINVAL;
1210         }
1211
1212         return 0;
1213 }
1214
1215 /* Avoid overly long expressions */
1216 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1217 {
1218         if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1219                 return true;
1220         return false;
1221 }
1222
1223 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1224 {
1225         if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1226                 return true;
1227         return false;
1228 }
1229
1230 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1231 {
1232         if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1233                 return true;
1234         return false;
1235 }
1236
1237 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1238                 struct usb_ctrlrequest *crq)
1239 {
1240         int retval = 0;
1241
1242         switch (crq->bRequest) {
1243         case USB_REQ_GET_STATUS: {
1244                 u16 status;
1245
1246                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1247                         status = cpu_to_le16(udc->devstatus);
1248                 } else if (crq->bRequestType
1249                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1250                         status = cpu_to_le16(0);
1251                 } else if (crq->bRequestType
1252                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1253                         struct usba_ep *target;
1254
1255                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1256                         if (!target)
1257                                 goto stall;
1258
1259                         status = 0;
1260                         if (is_stalled(udc, target))
1261                                 status |= cpu_to_le16(1);
1262                 } else
1263                         goto delegate;
1264
1265                 /* Write directly to the FIFO. No queueing is done. */
1266                 if (crq->wLength != cpu_to_le16(sizeof(status)))
1267                         goto stall;
1268                 ep->state = DATA_STAGE_IN;
1269                 __raw_writew(status, ep->fifo);
1270                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1271                 break;
1272         }
1273
1274         case USB_REQ_CLEAR_FEATURE: {
1275                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1276                         if (feature_is_dev_remote_wakeup(crq))
1277                                 udc->devstatus
1278                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1279                         else
1280                                 /* Can't CLEAR_FEATURE TEST_MODE */
1281                                 goto stall;
1282                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1283                         struct usba_ep *target;
1284
1285                         if (crq->wLength != cpu_to_le16(0)
1286                                         || !feature_is_ep_halt(crq))
1287                                 goto stall;
1288                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1289                         if (!target)
1290                                 goto stall;
1291
1292                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1293                         if (target->index != 0)
1294                                 usba_ep_writel(target, CLR_STA,
1295                                                 USBA_TOGGLE_CLR);
1296                 } else {
1297                         goto delegate;
1298                 }
1299
1300                 send_status(udc, ep);
1301                 break;
1302         }
1303
1304         case USB_REQ_SET_FEATURE: {
1305                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1306                         if (feature_is_dev_test_mode(crq)) {
1307                                 send_status(udc, ep);
1308                                 ep->state = STATUS_STAGE_TEST;
1309                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1310                                 return 0;
1311                         } else if (feature_is_dev_remote_wakeup(crq)) {
1312                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1313                         } else {
1314                                 goto stall;
1315                         }
1316                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1317                         struct usba_ep *target;
1318
1319                         if (crq->wLength != cpu_to_le16(0)
1320                                         || !feature_is_ep_halt(crq))
1321                                 goto stall;
1322
1323                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1324                         if (!target)
1325                                 goto stall;
1326
1327                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1328                 } else
1329                         goto delegate;
1330
1331                 send_status(udc, ep);
1332                 break;
1333         }
1334
1335         case USB_REQ_SET_ADDRESS:
1336                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1337                         goto delegate;
1338
1339                 set_address(udc, le16_to_cpu(crq->wValue));
1340                 send_status(udc, ep);
1341                 ep->state = STATUS_STAGE_ADDR;
1342                 break;
1343
1344         default:
1345 delegate:
1346                 spin_unlock(&udc->lock);
1347                 retval = udc->driver->setup(&udc->gadget, crq);
1348                 spin_lock(&udc->lock);
1349         }
1350
1351         return retval;
1352
1353 stall:
1354         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1355                 "halting endpoint...\n",
1356                 ep->ep.name, crq->bRequestType, crq->bRequest,
1357                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1358                 le16_to_cpu(crq->wLength));
1359         set_protocol_stall(udc, ep);
1360         return -1;
1361 }
1362
1363 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1364 {
1365         struct usba_request *req;
1366         u32 epstatus;
1367         u32 epctrl;
1368
1369 restart:
1370         epstatus = usba_ep_readl(ep, STA);
1371         epctrl = usba_ep_readl(ep, CTL);
1372
1373         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1374                         ep->ep.name, ep->state, epstatus, epctrl);
1375
1376         req = NULL;
1377         if (!list_empty(&ep->queue))
1378                 req = list_entry(ep->queue.next,
1379                                  struct usba_request, queue);
1380
1381         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1382                 if (req->submitted)
1383                         next_fifo_transaction(ep, req);
1384                 else
1385                         submit_request(ep, req);
1386
1387                 if (req->last_transaction) {
1388                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1389                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1390                 }
1391                 goto restart;
1392         }
1393         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1394                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1395
1396                 switch (ep->state) {
1397                 case DATA_STAGE_IN:
1398                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1399                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1400                         ep->state = STATUS_STAGE_OUT;
1401                         break;
1402                 case STATUS_STAGE_ADDR:
1403                         /* Activate our new address */
1404                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1405                                                 | USBA_FADDR_EN));
1406                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1407                         ep->state = WAIT_FOR_SETUP;
1408                         break;
1409                 case STATUS_STAGE_IN:
1410                         if (req) {
1411                                 list_del_init(&req->queue);
1412                                 request_complete(ep, req, 0);
1413                                 submit_next_request(ep);
1414                         }
1415                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1416                         ep->state = WAIT_FOR_SETUP;
1417                         break;
1418                 case STATUS_STAGE_TEST:
1419                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1420                         ep->state = WAIT_FOR_SETUP;
1421                         if (do_test_mode(udc))
1422                                 set_protocol_stall(udc, ep);
1423                         break;
1424                 default:
1425                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1426                                 "halting endpoint...\n",
1427                                 ep->ep.name, ep->state);
1428                         set_protocol_stall(udc, ep);
1429                         break;
1430                 }
1431
1432                 goto restart;
1433         }
1434         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1435                 switch (ep->state) {
1436                 case STATUS_STAGE_OUT:
1437                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1438                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1439
1440                         if (req) {
1441                                 list_del_init(&req->queue);
1442                                 request_complete(ep, req, 0);
1443                         }
1444                         ep->state = WAIT_FOR_SETUP;
1445                         break;
1446
1447                 case DATA_STAGE_OUT:
1448                         receive_data(ep);
1449                         break;
1450
1451                 default:
1452                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1453                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1454                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1455                                 "halting endpoint...\n",
1456                                 ep->ep.name, ep->state);
1457                         set_protocol_stall(udc, ep);
1458                         break;
1459                 }
1460
1461                 goto restart;
1462         }
1463         if (epstatus & USBA_RX_SETUP) {
1464                 union {
1465                         struct usb_ctrlrequest crq;
1466                         unsigned long data[2];
1467                 } crq;
1468                 unsigned int pkt_len;
1469                 int ret;
1470
1471                 if (ep->state != WAIT_FOR_SETUP) {
1472                         /*
1473                          * Didn't expect a SETUP packet at this
1474                          * point. Clean up any pending requests (which
1475                          * may be successful).
1476                          */
1477                         int status = -EPROTO;
1478
1479                         /*
1480                          * RXRDY and TXCOMP are dropped when SETUP
1481                          * packets arrive.  Just pretend we received
1482                          * the status packet.
1483                          */
1484                         if (ep->state == STATUS_STAGE_OUT
1485                                         || ep->state == STATUS_STAGE_IN) {
1486                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1487                                 status = 0;
1488                         }
1489
1490                         if (req) {
1491                                 list_del_init(&req->queue);
1492                                 request_complete(ep, req, status);
1493                         }
1494                 }
1495
1496                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1497                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1498                 if (pkt_len != sizeof(crq)) {
1499                         pr_warning("udc: Invalid packet length %u "
1500                                 "(expected %zu)\n", pkt_len, sizeof(crq));
1501                         set_protocol_stall(udc, ep);
1502                         return;
1503                 }
1504
1505                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1506                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1507
1508                 /* Free up one bank in the FIFO so that we can
1509                  * generate or receive a reply right away. */
1510                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1511
1512                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1513                         ep->state, crq.crq.bRequestType,
1514                         crq.crq.bRequest); */
1515
1516                 if (crq.crq.bRequestType & USB_DIR_IN) {
1517                         /*
1518                          * The USB 2.0 spec states that "if wLength is
1519                          * zero, there is no data transfer phase."
1520                          * However, testusb #14 seems to actually
1521                          * expect a data phase even if wLength = 0...
1522                          */
1523                         ep->state = DATA_STAGE_IN;
1524                 } else {
1525                         if (crq.crq.wLength != cpu_to_le16(0))
1526                                 ep->state = DATA_STAGE_OUT;
1527                         else
1528                                 ep->state = STATUS_STAGE_IN;
1529                 }
1530
1531                 ret = -1;
1532                 if (ep->index == 0)
1533                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1534                 else {
1535                         spin_unlock(&udc->lock);
1536                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1537                         spin_lock(&udc->lock);
1538                 }
1539
1540                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1541                         crq.crq.bRequestType, crq.crq.bRequest,
1542                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1543
1544                 if (ret < 0) {
1545                         /* Let the host know that we failed */
1546                         set_protocol_stall(udc, ep);
1547                 }
1548         }
1549 }
1550
1551 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1552 {
1553         struct usba_request *req;
1554         u32 epstatus;
1555         u32 epctrl;
1556
1557         epstatus = usba_ep_readl(ep, STA);
1558         epctrl = usba_ep_readl(ep, CTL);
1559
1560         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1561
1562         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1563                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1564
1565                 if (list_empty(&ep->queue)) {
1566                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1567                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1568                         return;
1569                 }
1570
1571                 req = list_entry(ep->queue.next, struct usba_request, queue);
1572
1573                 if (req->using_dma) {
1574                         /* Send a zero-length packet */
1575                         usba_ep_writel(ep, SET_STA,
1576                                         USBA_TX_PK_RDY);
1577                         usba_ep_writel(ep, CTL_DIS,
1578                                         USBA_TX_PK_RDY);
1579                         list_del_init(&req->queue);
1580                         submit_next_request(ep);
1581                         request_complete(ep, req, 0);
1582                 } else {
1583                         if (req->submitted)
1584                                 next_fifo_transaction(ep, req);
1585                         else
1586                                 submit_request(ep, req);
1587
1588                         if (req->last_transaction) {
1589                                 list_del_init(&req->queue);
1590                                 submit_next_request(ep);
1591                                 request_complete(ep, req, 0);
1592                         }
1593                 }
1594
1595                 epstatus = usba_ep_readl(ep, STA);
1596                 epctrl = usba_ep_readl(ep, CTL);
1597         }
1598         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1599                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1600                 receive_data(ep);
1601                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1602         }
1603 }
1604
1605 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1606 {
1607         struct usba_request *req;
1608         u32 status, control, pending;
1609
1610         status = usba_dma_readl(ep, STATUS);
1611         control = usba_dma_readl(ep, CONTROL);
1612 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1613         ep->last_dma_status = status;
1614 #endif
1615         pending = status & control;
1616         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1617
1618         if (status & USBA_DMA_CH_EN) {
1619                 dev_err(&udc->pdev->dev,
1620                         "DMA_CH_EN is set after transfer is finished!\n");
1621                 dev_err(&udc->pdev->dev,
1622                         "status=%#08x, pending=%#08x, control=%#08x\n",
1623                         status, pending, control);
1624
1625                 /*
1626                  * try to pretend nothing happened. We might have to
1627                  * do something here...
1628                  */
1629         }
1630
1631         if (list_empty(&ep->queue))
1632                 /* Might happen if a reset comes along at the right moment */
1633                 return;
1634
1635         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1636                 req = list_entry(ep->queue.next, struct usba_request, queue);
1637                 usba_update_req(ep, req, status);
1638
1639                 list_del_init(&req->queue);
1640                 submit_next_request(ep);
1641                 request_complete(ep, req, 0);
1642         }
1643 }
1644
1645 static irqreturn_t usba_udc_irq(int irq, void *devid)
1646 {
1647         struct usba_udc *udc = devid;
1648         u32 status;
1649         u32 dma_status;
1650         u32 ep_status;
1651
1652         spin_lock(&udc->lock);
1653
1654         status = usba_readl(udc, INT_STA);
1655         DBG(DBG_INT, "irq, status=%#08x\n", status);
1656
1657         if (status & USBA_DET_SUSPEND) {
1658                 toggle_bias(0);
1659                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1660                 DBG(DBG_BUS, "Suspend detected\n");
1661                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1662                                 && udc->driver && udc->driver->suspend) {
1663                         spin_unlock(&udc->lock);
1664                         udc->driver->suspend(&udc->gadget);
1665                         spin_lock(&udc->lock);
1666                 }
1667         }
1668
1669         if (status & USBA_WAKE_UP) {
1670                 toggle_bias(1);
1671                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1672                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1673         }
1674
1675         if (status & USBA_END_OF_RESUME) {
1676                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1677                 DBG(DBG_BUS, "Resume detected\n");
1678                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1679                                 && udc->driver && udc->driver->resume) {
1680                         spin_unlock(&udc->lock);
1681                         udc->driver->resume(&udc->gadget);
1682                         spin_lock(&udc->lock);
1683                 }
1684         }
1685
1686         dma_status = USBA_BFEXT(DMA_INT, status);
1687         if (dma_status) {
1688                 int i;
1689
1690                 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1691                         if (dma_status & (1 << i))
1692                                 usba_dma_irq(udc, &usba_ep[i]);
1693         }
1694
1695         ep_status = USBA_BFEXT(EPT_INT, status);
1696         if (ep_status) {
1697                 int i;
1698
1699                 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1700                         if (ep_status & (1 << i)) {
1701                                 if (ep_is_control(&usba_ep[i]))
1702                                         usba_control_irq(udc, &usba_ep[i]);
1703                                 else
1704                                         usba_ep_irq(udc, &usba_ep[i]);
1705                         }
1706         }
1707
1708         if (status & USBA_END_OF_RESET) {
1709                 struct usba_ep *ep0;
1710
1711                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1712                 reset_all_endpoints(udc);
1713
1714                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1715                                 && udc->driver->disconnect) {
1716                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1717                         spin_unlock(&udc->lock);
1718                         udc->driver->disconnect(&udc->gadget);
1719                         spin_lock(&udc->lock);
1720                 }
1721
1722                 if (status & USBA_HIGH_SPEED)
1723                         udc->gadget.speed = USB_SPEED_HIGH;
1724                 else
1725                         udc->gadget.speed = USB_SPEED_FULL;
1726                 DBG(DBG_BUS, "%s bus reset detected\n",
1727                     usb_speed_string(udc->gadget.speed));
1728
1729                 ep0 = &usba_ep[0];
1730                 ep0->desc = &usba_ep0_desc;
1731                 ep0->state = WAIT_FOR_SETUP;
1732                 usba_ep_writel(ep0, CFG,
1733                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1734                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1735                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1736                 usba_ep_writel(ep0, CTL_ENB,
1737                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1738                 usba_writel(udc, INT_ENB,
1739                                 (usba_readl(udc, INT_ENB)
1740                                 | USBA_BF(EPT_INT, 1)
1741                                 | USBA_DET_SUSPEND
1742                                 | USBA_END_OF_RESUME));
1743
1744                 /*
1745                  * Unclear why we hit this irregularly, e.g. in usbtest,
1746                  * but it's clearly harmless...
1747                  */
1748                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1749                         dev_dbg(&udc->pdev->dev,
1750                                  "ODD: EP0 configuration is invalid!\n");
1751         }
1752
1753         spin_unlock(&udc->lock);
1754
1755         return IRQ_HANDLED;
1756 }
1757
1758 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1759 {
1760         struct usba_udc *udc = devid;
1761         int vbus;
1762
1763         /* debounce */
1764         udelay(10);
1765
1766         spin_lock(&udc->lock);
1767
1768         /* May happen if Vbus pin toggles during probe() */
1769         if (!udc->driver)
1770                 goto out;
1771
1772         vbus = vbus_is_present(udc);
1773         if (vbus != udc->vbus_prev) {
1774                 if (vbus) {
1775                         toggle_bias(1);
1776                         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1777                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1778                 } else {
1779                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1780                         reset_all_endpoints(udc);
1781                         toggle_bias(0);
1782                         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1783                         if (udc->driver->disconnect) {
1784                                 spin_unlock(&udc->lock);
1785                                 udc->driver->disconnect(&udc->gadget);
1786                                 spin_lock(&udc->lock);
1787                         }
1788                 }
1789                 udc->vbus_prev = vbus;
1790         }
1791
1792 out:
1793         spin_unlock(&udc->lock);
1794
1795         return IRQ_HANDLED;
1796 }
1797
1798 static int atmel_usba_start(struct usb_gadget_driver *driver,
1799                 int (*bind)(struct usb_gadget *))
1800 {
1801         struct usba_udc *udc = &the_udc;
1802         unsigned long flags;
1803         int ret;
1804
1805         if (!udc->pdev)
1806                 return -ENODEV;
1807
1808         spin_lock_irqsave(&udc->lock, flags);
1809         if (udc->driver) {
1810                 spin_unlock_irqrestore(&udc->lock, flags);
1811                 return -EBUSY;
1812         }
1813
1814         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1815         udc->driver = driver;
1816         udc->gadget.dev.driver = &driver->driver;
1817         spin_unlock_irqrestore(&udc->lock, flags);
1818
1819         clk_enable(udc->pclk);
1820         clk_enable(udc->hclk);
1821
1822         ret = bind(&udc->gadget);
1823         if (ret) {
1824                 DBG(DBG_ERR, "Could not bind to driver %s: error %d\n",
1825                         driver->driver.name, ret);
1826                 goto err_driver_bind;
1827         }
1828
1829         DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1830
1831         udc->vbus_prev = 0;
1832         if (gpio_is_valid(udc->vbus_pin))
1833                 enable_irq(gpio_to_irq(udc->vbus_pin));
1834
1835         /* If Vbus is present, enable the controller and wait for reset */
1836         spin_lock_irqsave(&udc->lock, flags);
1837         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1838                 toggle_bias(1);
1839                 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1840                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1841         }
1842         spin_unlock_irqrestore(&udc->lock, flags);
1843
1844         return 0;
1845
1846 err_driver_bind:
1847         udc->driver = NULL;
1848         udc->gadget.dev.driver = NULL;
1849         return ret;
1850 }
1851
1852 static int atmel_usba_stop(struct usb_gadget_driver *driver)
1853 {
1854         struct usba_udc *udc = &the_udc;
1855         unsigned long flags;
1856
1857         if (!udc->pdev)
1858                 return -ENODEV;
1859         if (driver != udc->driver || !driver->unbind)
1860                 return -EINVAL;
1861
1862         if (gpio_is_valid(udc->vbus_pin))
1863                 disable_irq(gpio_to_irq(udc->vbus_pin));
1864
1865         spin_lock_irqsave(&udc->lock, flags);
1866         udc->gadget.speed = USB_SPEED_UNKNOWN;
1867         reset_all_endpoints(udc);
1868         spin_unlock_irqrestore(&udc->lock, flags);
1869
1870         /* This will also disable the DP pullup */
1871         toggle_bias(0);
1872         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1873
1874         if (udc->driver->disconnect)
1875                 udc->driver->disconnect(&udc->gadget);
1876
1877         driver->unbind(&udc->gadget);
1878         udc->gadget.dev.driver = NULL;
1879         udc->driver = NULL;
1880
1881         clk_disable(udc->hclk);
1882         clk_disable(udc->pclk);
1883
1884         DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1885
1886         return 0;
1887 }
1888
1889 static int __init usba_udc_probe(struct platform_device *pdev)
1890 {
1891         struct usba_platform_data *pdata = pdev->dev.platform_data;
1892         struct resource *regs, *fifo;
1893         struct clk *pclk, *hclk;
1894         struct usba_udc *udc = &the_udc;
1895         int irq, ret, i;
1896
1897         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1898         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1899         if (!regs || !fifo || !pdata)
1900                 return -ENXIO;
1901
1902         irq = platform_get_irq(pdev, 0);
1903         if (irq < 0)
1904                 return irq;
1905
1906         pclk = clk_get(&pdev->dev, "pclk");
1907         if (IS_ERR(pclk))
1908                 return PTR_ERR(pclk);
1909         hclk = clk_get(&pdev->dev, "hclk");
1910         if (IS_ERR(hclk)) {
1911                 ret = PTR_ERR(hclk);
1912                 goto err_get_hclk;
1913         }
1914
1915         spin_lock_init(&udc->lock);
1916         udc->pdev = pdev;
1917         udc->pclk = pclk;
1918         udc->hclk = hclk;
1919         udc->vbus_pin = -ENODEV;
1920
1921         ret = -ENOMEM;
1922         udc->regs = ioremap(regs->start, resource_size(regs));
1923         if (!udc->regs) {
1924                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1925                 goto err_map_regs;
1926         }
1927         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1928                  (unsigned long)regs->start, udc->regs);
1929         udc->fifo = ioremap(fifo->start, resource_size(fifo));
1930         if (!udc->fifo) {
1931                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1932                 goto err_map_fifo;
1933         }
1934         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1935                  (unsigned long)fifo->start, udc->fifo);
1936
1937         device_initialize(&udc->gadget.dev);
1938         udc->gadget.dev.parent = &pdev->dev;
1939         udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1940
1941         platform_set_drvdata(pdev, udc);
1942
1943         /* Make sure we start from a clean slate */
1944         clk_enable(pclk);
1945         toggle_bias(0);
1946         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1947         clk_disable(pclk);
1948
1949         usba_ep = kzalloc(sizeof(struct usba_ep) * pdata->num_ep,
1950                           GFP_KERNEL);
1951         if (!usba_ep)
1952                 goto err_alloc_ep;
1953
1954         the_udc.gadget.ep0 = &usba_ep[0].ep;
1955
1956         INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1957         usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1958         usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1959         usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1960         usba_ep[0].ep.ops = &usba_ep_ops;
1961         usba_ep[0].ep.name = pdata->ep[0].name;
1962         usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
1963         usba_ep[0].udc = &the_udc;
1964         INIT_LIST_HEAD(&usba_ep[0].queue);
1965         usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
1966         usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
1967         usba_ep[0].index = pdata->ep[0].index;
1968         usba_ep[0].can_dma = pdata->ep[0].can_dma;
1969         usba_ep[0].can_isoc = pdata->ep[0].can_isoc;
1970
1971         for (i = 1; i < pdata->num_ep; i++) {
1972                 struct usba_ep *ep = &usba_ep[i];
1973
1974                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1975                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1976                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1977                 ep->ep.ops = &usba_ep_ops;
1978                 ep->ep.name = pdata->ep[i].name;
1979                 ep->ep.maxpacket = pdata->ep[i].fifo_size;
1980                 ep->udc = &the_udc;
1981                 INIT_LIST_HEAD(&ep->queue);
1982                 ep->fifo_size = pdata->ep[i].fifo_size;
1983                 ep->nr_banks = pdata->ep[i].nr_banks;
1984                 ep->index = pdata->ep[i].index;
1985                 ep->can_dma = pdata->ep[i].can_dma;
1986                 ep->can_isoc = pdata->ep[i].can_isoc;
1987
1988                 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1989         }
1990
1991         ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
1992         if (ret) {
1993                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
1994                         irq, ret);
1995                 goto err_request_irq;
1996         }
1997         udc->irq = irq;
1998
1999         ret = device_add(&udc->gadget.dev);
2000         if (ret) {
2001                 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
2002                 goto err_device_add;
2003         }
2004
2005         if (gpio_is_valid(pdata->vbus_pin)) {
2006                 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
2007                         udc->vbus_pin = pdata->vbus_pin;
2008                         udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
2009
2010                         ret = request_irq(gpio_to_irq(udc->vbus_pin),
2011                                         usba_vbus_irq, 0,
2012                                         "atmel_usba_udc", udc);
2013                         if (ret) {
2014                                 gpio_free(udc->vbus_pin);
2015                                 udc->vbus_pin = -ENODEV;
2016                                 dev_warn(&udc->pdev->dev,
2017                                          "failed to request vbus irq; "
2018                                          "assuming always on\n");
2019                         } else {
2020                                 disable_irq(gpio_to_irq(udc->vbus_pin));
2021                         }
2022                 } else {
2023                         /* gpio_request fail so use -EINVAL for gpio_is_valid */
2024                         udc->vbus_pin = -EINVAL;
2025                 }
2026         }
2027
2028         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2029         if (ret)
2030                 goto err_add_udc;
2031
2032         usba_init_debugfs(udc);
2033         for (i = 1; i < pdata->num_ep; i++)
2034                 usba_ep_init_debugfs(udc, &usba_ep[i]);
2035
2036         return 0;
2037
2038 err_add_udc:
2039         if (gpio_is_valid(pdata->vbus_pin)) {
2040                 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2041                 gpio_free(udc->vbus_pin);
2042         }
2043
2044         device_unregister(&udc->gadget.dev);
2045
2046 err_device_add:
2047         free_irq(irq, udc);
2048 err_request_irq:
2049         kfree(usba_ep);
2050 err_alloc_ep:
2051         iounmap(udc->fifo);
2052 err_map_fifo:
2053         iounmap(udc->regs);
2054 err_map_regs:
2055         clk_put(hclk);
2056 err_get_hclk:
2057         clk_put(pclk);
2058
2059         platform_set_drvdata(pdev, NULL);
2060
2061         return ret;
2062 }
2063
2064 static int __exit usba_udc_remove(struct platform_device *pdev)
2065 {
2066         struct usba_udc *udc;
2067         int i;
2068         struct usba_platform_data *pdata = pdev->dev.platform_data;
2069
2070         udc = platform_get_drvdata(pdev);
2071
2072         usb_del_gadget_udc(&udc->gadget);
2073
2074         for (i = 1; i < pdata->num_ep; i++)
2075                 usba_ep_cleanup_debugfs(&usba_ep[i]);
2076         usba_cleanup_debugfs(udc);
2077
2078         if (gpio_is_valid(udc->vbus_pin)) {
2079                 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2080                 gpio_free(udc->vbus_pin);
2081         }
2082
2083         free_irq(udc->irq, udc);
2084         kfree(usba_ep);
2085         iounmap(udc->fifo);
2086         iounmap(udc->regs);
2087         clk_put(udc->hclk);
2088         clk_put(udc->pclk);
2089
2090         device_unregister(&udc->gadget.dev);
2091
2092         return 0;
2093 }
2094
2095 static struct platform_driver udc_driver = {
2096         .remove         = __exit_p(usba_udc_remove),
2097         .driver         = {
2098                 .name           = "atmel_usba_udc",
2099                 .owner          = THIS_MODULE,
2100         },
2101 };
2102
2103 static int __init udc_init(void)
2104 {
2105         return platform_driver_probe(&udc_driver, usba_udc_probe);
2106 }
2107 module_init(udc_init);
2108
2109 static void __exit udc_exit(void)
2110 {
2111         platform_driver_unregister(&udc_driver);
2112 }
2113 module_exit(udc_exit);
2114
2115 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2116 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2117 MODULE_LICENSE("GPL");
2118 MODULE_ALIAS("platform:atmel_usba_udc");