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_sys_read(AT91_CKGR_UCKR);
 336
 337         if (is_on)
 338                 at91_sys_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
 339         else
 340                 at91_sys_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
 663         list_splice_init(&ep->queue, &req_list);
 664         if (ep->can_dma) {
 665                 usba_dma_writel(ep, CONTROL, 0);
 666                 usba_dma_writel(ep, ADDRESS, 0);
 667                 usba_dma_readl(ep, STATUS);
 668         }
 669         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 670         usba_writel(udc, INT_ENB,
 671                         usba_readl(udc, INT_ENB)
 672                         & ~USBA_BF(EPT_INT, 1 << ep->index));
 673
 674         request_complete_list(ep, &req_list, -ESHUTDOWN);
 675
 676         spin_unlock_irqrestore(&udc->lock, flags);
 677
 678         return 0;
 679 }
 680
 681 static struct usb_request *
 682 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 683 {
 684         struct usba_request *req;
 685
 686         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 687
 688         req = kzalloc(sizeof(*req), gfp_flags);
 689         if (!req)
 690                 return NULL;
 691
 692         INIT_LIST_HEAD(&req->queue);
 693         req->req.dma = DMA_ADDR_INVALID;
 694
 695         return &req->req;
 696 }
 697
 698 static void
 699 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 700 {
 701         struct usba_request *req = to_usba_req(_req);
 702
 703         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 704
 705         kfree(req);
 706 }
 707
 708 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 709                 struct usba_request *req, gfp_t gfp_flags)
 710 {
 711         unsigned long flags;
 712         int ret;
 713
 714         DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
 715                 ep->ep.name, req->req.length, req->req.dma,
 716                 req->req.zero ? 'Z' : 'z',
 717                 req->req.short_not_ok ? 'S' : 's',
 718                 req->req.no_interrupt ? 'I' : 'i');
 719
 720         if (req->req.length > 0x10000) {
 721                 /* Lengths from 0 to 65536 (inclusive) are supported */
 722                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 723                 return -EINVAL;
 724         }
 725
 726         req->using_dma = 1;
 727
 728         if (req->req.dma == DMA_ADDR_INVALID) {
 729                 req->req.dma = dma_map_single(
 730                         &udc->pdev->dev, req->req.buf, req->req.length,
 731                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 732                 req->mapped = 1;
 733         } else {
 734                 dma_sync_single_for_device(
 735                         &udc->pdev->dev, req->req.dma, req->req.length,
 736                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 737                 req->mapped = 0;
 738         }
 739
 740         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 741                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 742                         | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 743
 744         if (ep->is_in)
 745                 req->ctrl |= USBA_DMA_END_BUF_EN;
 746
 747         /*
 748          * Add this request to the queue and submit for DMA if
 749          * possible. Check if we're still alive first -- we may have
 750          * received a reset since last time we checked.
 751          */
 752         ret = -ESHUTDOWN;
 753         spin_lock_irqsave(&udc->lock, flags);
 754         if (ep->desc) {
 755                 if (list_empty(&ep->queue))
 756                         submit_request(ep, req);
 757
 758                 list_add_tail(&req->queue, &ep->queue);
 759                 ret = 0;
 760         }
 761         spin_unlock_irqrestore(&udc->lock, flags);
 762
 763         return ret;
 764 }
 765
 766 static int
 767 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 768 {
 769         struct usba_request *req = to_usba_req(_req);
 770         struct usba_ep *ep = to_usba_ep(_ep);
 771         struct usba_udc *udc = ep->udc;
 772         unsigned long flags;
 773         int ret;
 774
 775         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 776                         ep->ep.name, req, _req->length);
 777
 778         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN || !ep->desc)
 779                 return -ESHUTDOWN;
 780
 781         req->submitted = 0;
 782         req->using_dma = 0;
 783         req->last_transaction = 0;
 784
 785         _req->status = -EINPROGRESS;
 786         _req->actual = 0;
 787
 788         if (ep->can_dma)
 789                 return queue_dma(udc, ep, req, gfp_flags);
 790
 791         /* May have received a reset since last time we checked */
 792         ret = -ESHUTDOWN;
 793         spin_lock_irqsave(&udc->lock, flags);
 794         if (ep->desc) {
 795                 list_add_tail(&req->queue, &ep->queue);
 796
 797                 if ((!ep_is_control(ep) && ep->is_in) ||
 798                         (ep_is_control(ep)
 799                                 && (ep->state == DATA_STAGE_IN
 800                                         || ep->state == STATUS_STAGE_IN)))
 801                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 802                 else
 803                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 804                 ret = 0;
 805         }
 806         spin_unlock_irqrestore(&udc->lock, flags);
 807
 808         return ret;
 809 }
 810
 811 static void
 812 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 813 {
 814         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 815 }
 816
 817 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 818 {
 819         unsigned int timeout;
 820         u32 status;
 821
 822         /*
 823          * Stop the DMA controller. When writing both CH_EN
 824          * and LINK to 0, the other bits are not affected.
 825          */
 826         usba_dma_writel(ep, CONTROL, 0);
 827
 828         /* Wait for the FIFO to empty */
 829         for (timeout = 40; timeout; --timeout) {
 830                 status = usba_dma_readl(ep, STATUS);
 831                 if (!(status & USBA_DMA_CH_EN))
 832                         break;
 833                 udelay(1);
 834         }
 835
 836         if (pstatus)
 837                 *pstatus = status;
 838
 839         if (timeout == 0) {
 840                 dev_err(&ep->udc->pdev->dev,
 841                         "%s: timed out waiting for DMA FIFO to empty\n",
 842                         ep->ep.name);
 843                 return -ETIMEDOUT;
 844         }
 845
 846         return 0;
 847 }
 848
 849 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 850 {
 851         struct usba_ep *ep = to_usba_ep(_ep);
 852         struct usba_udc *udc = ep->udc;
 853         struct usba_request *req = to_usba_req(_req);
 854         unsigned long flags;
 855         u32 status;
 856
 857         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 858                         ep->ep.name, req);
 859
 860         spin_lock_irqsave(&udc->lock, flags);
 861
 862         if (req->using_dma) {
 863                 /*
 864                  * If this request is currently being transferred,
 865                  * stop the DMA controller and reset the FIFO.
 866                  */
 867                 if (ep->queue.next == &req->queue) {
 868                         status = usba_dma_readl(ep, STATUS);
 869                         if (status & USBA_DMA_CH_EN)
 870                                 stop_dma(ep, &status);
 871
 872 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 873                         ep->last_dma_status = status;
 874 #endif
 875
 876                         usba_writel(udc, EPT_RST, 1 << ep->index);
 877
 878                         usba_update_req(ep, req, status);
 879                 }
 880         }
 881
 882         /*
 883          * Errors should stop the queue from advancing until the
 884          * completion function returns.
 885          */
 886         list_del_init(&req->queue);
 887
 888         request_complete(ep, req, -ECONNRESET);
 889
 890         /* Process the next request if any */
 891         submit_next_request(ep);
 892         spin_unlock_irqrestore(&udc->lock, flags);
 893
 894         return 0;
 895 }
 896
 897 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 898 {
 899         struct usba_ep *ep = to_usba_ep(_ep);
 900         struct usba_udc *udc = ep->udc;
 901         unsigned long flags;
 902         int ret = 0;
 903
 904         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 905                         value ? "set" : "clear");
 906
 907         if (!ep->desc) {
 908                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 909                                 ep->ep.name);
 910                 return -ENODEV;
 911         }
 912         if (ep->is_isoc) {
 913                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 914                                 ep->ep.name);
 915                 return -ENOTTY;
 916         }
 917
 918         spin_lock_irqsave(&udc->lock, flags);
 919
 920         /*
 921          * We can't halt IN endpoints while there are still data to be
 922          * transferred
 923          */
 924         if (!list_empty(&ep->queue)
 925                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 926                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 927                 ret = -EAGAIN;
 928         } else {
 929                 if (value)
 930                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 931                 else
 932                         usba_ep_writel(ep, CLR_STA,
 933                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 934                 usba_ep_readl(ep, STA);
 935         }
 936
 937         spin_unlock_irqrestore(&udc->lock, flags);
 938
 939         return ret;
 940 }
 941
 942 static int usba_ep_fifo_status(struct usb_ep *_ep)
 943 {
 944         struct usba_ep *ep = to_usba_ep(_ep);
 945
 946         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 947 }
 948
 949 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 950 {
 951         struct usba_ep *ep = to_usba_ep(_ep);
 952         struct usba_udc *udc = ep->udc;
 953
 954         usba_writel(udc, EPT_RST, 1 << ep->index);
 955 }
 956
 957 static const struct usb_ep_ops usba_ep_ops = {
 958         .enable         = usba_ep_enable,
 959         .disable        = usba_ep_disable,
 960         .alloc_request  = usba_ep_alloc_request,
 961         .free_request   = usba_ep_free_request,
 962         .queue          = usba_ep_queue,
 963         .dequeue        = usba_ep_dequeue,
 964         .set_halt       = usba_ep_set_halt,
 965         .fifo_status    = usba_ep_fifo_status,
 966         .fifo_flush     = usba_ep_fifo_flush,
 967 };
 968
 969 static int usba_udc_get_frame(struct usb_gadget *gadget)
 970 {
 971         struct usba_udc *udc = to_usba_udc(gadget);
 972
 973         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 974 }
 975
 976 static int usba_udc_wakeup(struct usb_gadget *gadget)
 977 {
 978         struct usba_udc *udc = to_usba_udc(gadget);
 979         unsigned long flags;
 980         u32 ctrl;
 981         int ret = -EINVAL;
 982
 983         spin_lock_irqsave(&udc->lock, flags);
 984         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 985                 ctrl = usba_readl(udc, CTRL);
 986                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 987                 ret = 0;
 988         }
 989         spin_unlock_irqrestore(&udc->lock, flags);
 990
 991         return ret;
 992 }
 993
 994 static int
 995 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 996 {
 997         struct usba_udc *udc = to_usba_udc(gadget);
 998         unsigned long flags;
 999
1000         spin_lock_irqsave(&udc->lock, flags);
1001         if (is_selfpowered)
1002                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1003         else
1004                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1005         spin_unlock_irqrestore(&udc->lock, flags);
1006
1007         return 0;
1008 }
1009
1010 static int atmel_usba_start(struct usb_gadget_driver *driver,
1011                 int (*bind)(struct usb_gadget *));
1012 static int atmel_usba_stop(struct usb_gadget_driver *driver);
1013
1014 static const struct usb_gadget_ops usba_udc_ops = {
1015         .get_frame              = usba_udc_get_frame,
1016         .wakeup                 = usba_udc_wakeup,
1017         .set_selfpowered        = usba_udc_set_selfpowered,
1018         .start                  = atmel_usba_start,
1019         .stop                   = atmel_usba_stop,
1020 };
1021
1022 static struct usb_endpoint_descriptor usba_ep0_desc = {
1023         .bLength = USB_DT_ENDPOINT_SIZE,
1024         .bDescriptorType = USB_DT_ENDPOINT,
1025         .bEndpointAddress = 0,
1026         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1027         .wMaxPacketSize = cpu_to_le16(64),
1028         /* FIXME: I have no idea what to put here */
1029         .bInterval = 1,
1030 };
1031
1032 static void nop_release(struct device *dev)
1033 {
1034
1035 }
1036
1037 static struct usba_udc the_udc = {
1038         .gadget = {
1039                 .ops            = &usba_udc_ops,
1040                 .ep_list        = LIST_HEAD_INIT(the_udc.gadget.ep_list),
1041                 .is_dualspeed   = 1,
1042                 .name           = "atmel_usba_udc",
1043                 .dev    = {
1044                         .init_name      = "gadget",
1045                         .release        = nop_release,
1046                 },
1047         },
1048 };
1049
1050 /*
1051  * Called with interrupts disabled and udc->lock held.
1052  */
1053 static void reset_all_endpoints(struct usba_udc *udc)
1054 {
1055         struct usba_ep *ep;
1056         struct usba_request *req, *tmp_req;
1057
1058         usba_writel(udc, EPT_RST, ~0UL);
1059
1060         ep = to_usba_ep(udc->gadget.ep0);
1061         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1062                 list_del_init(&req->queue);
1063                 request_complete(ep, req, -ECONNRESET);
1064         }
1065
1066         /* NOTE:  normally, the next call to the gadget driver is in
1067          * charge of disabling endpoints... usually disconnect().
1068          * The exception would be entering a high speed test mode.
1069          *
1070          * FIXME remove this code ... and retest thoroughly.
1071          */
1072         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1073                 if (ep->desc) {
1074                         spin_unlock(&udc->lock);
1075                         usba_ep_disable(&ep->ep);
1076                         spin_lock(&udc->lock);
1077                 }
1078         }
1079 }
1080
1081 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1082 {
1083         struct usba_ep *ep;
1084
1085         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1086                 return to_usba_ep(udc->gadget.ep0);
1087
1088         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1089                 u8 bEndpointAddress;
1090
1091                 if (!ep->desc)
1092                         continue;
1093                 bEndpointAddress = ep->desc->bEndpointAddress;
1094                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1095                         continue;
1096                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1097                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1098                         return ep;
1099         }
1100
1101         return NULL;
1102 }
1103
1104 /* Called with interrupts disabled and udc->lock held */
1105 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1106 {
1107         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1108         ep->state = WAIT_FOR_SETUP;
1109 }
1110
1111 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1112 {
1113         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1114                 return 1;
1115         return 0;
1116 }
1117
1118 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1119 {
1120         u32 regval;
1121
1122         DBG(DBG_BUS, "setting address %u...\n", addr);
1123         regval = usba_readl(udc, CTRL);
1124         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1125         usba_writel(udc, CTRL, regval);
1126 }
1127
1128 static int do_test_mode(struct usba_udc *udc)
1129 {
1130         static const char test_packet_buffer[] = {
1131                 /* JKJKJKJK * 9 */
1132                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1133                 /* JJKKJJKK * 8 */
1134                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1135                 /* JJKKJJKK * 8 */
1136                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1137                 /* JJJJJJJKKKKKKK * 8 */
1138                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1139                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1140                 /* JJJJJJJK * 8 */
1141                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1142                 /* {JKKKKKKK * 10}, JK */
1143                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1144         };
1145         struct usba_ep *ep;
1146         struct device *dev = &udc->pdev->dev;
1147         int test_mode;
1148
1149         test_mode = udc->test_mode;
1150
1151         /* Start from a clean slate */
1152         reset_all_endpoints(udc);
1153
1154         switch (test_mode) {
1155         case 0x0100:
1156                 /* Test_J */
1157                 usba_writel(udc, TST, USBA_TST_J_MODE);
1158                 dev_info(dev, "Entering Test_J mode...\n");
1159                 break;
1160         case 0x0200:
1161                 /* Test_K */
1162                 usba_writel(udc, TST, USBA_TST_K_MODE);
1163                 dev_info(dev, "Entering Test_K mode...\n");
1164                 break;
1165         case 0x0300:
1166                 /*
1167                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1168                  * for Bulk IN transfers
1169                  */
1170                 ep = &usba_ep[0];
1171                 usba_writel(udc, TST,
1172                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1173                 usba_ep_writel(ep, CFG,
1174                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1175                                 | USBA_EPT_DIR_IN
1176                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1177                                 | USBA_BF(BK_NUMBER, 1));
1178                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1179                         set_protocol_stall(udc, ep);
1180                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1181                 } else {
1182                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1183                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1184                 }
1185                 break;
1186         case 0x0400:
1187                 /* Test_Packet */
1188                 ep = &usba_ep[0];
1189                 usba_ep_writel(ep, CFG,
1190                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1191                                 | USBA_EPT_DIR_IN
1192                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1193                                 | USBA_BF(BK_NUMBER, 1));
1194                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1195                         set_protocol_stall(udc, ep);
1196                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1197                 } else {
1198                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1199                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1200                         memcpy_toio(ep->fifo, test_packet_buffer,
1201                                         sizeof(test_packet_buffer));
1202                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1203                         dev_info(dev, "Entering Test_Packet mode...\n");
1204                 }
1205                 break;
1206         default:
1207                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1208                 return -EINVAL;
1209         }
1210
1211         return 0;
1212 }
1213
1214 /* Avoid overly long expressions */
1215 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1216 {
1217         if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1218                 return true;
1219         return false;
1220 }
1221
1222 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1223 {
1224         if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1225                 return true;
1226         return false;
1227 }
1228
1229 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1230 {
1231         if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1232                 return true;
1233         return false;
1234 }
1235
1236 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1237                 struct usb_ctrlrequest *crq)
1238 {
1239         int retval = 0;
1240
1241         switch (crq->bRequest) {
1242         case USB_REQ_GET_STATUS: {
1243                 u16 status;
1244
1245                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1246                         status = cpu_to_le16(udc->devstatus);
1247                 } else if (crq->bRequestType
1248                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1249                         status = cpu_to_le16(0);
1250                 } else if (crq->bRequestType
1251                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1252                         struct usba_ep *target;
1253
1254                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1255                         if (!target)
1256                                 goto stall;
1257
1258                         status = 0;
1259                         if (is_stalled(udc, target))
1260                                 status |= cpu_to_le16(1);
1261                 } else
1262                         goto delegate;
1263
1264                 /* Write directly to the FIFO. No queueing is done. */
1265                 if (crq->wLength != cpu_to_le16(sizeof(status)))
1266                         goto stall;
1267                 ep->state = DATA_STAGE_IN;
1268                 __raw_writew(status, ep->fifo);
1269                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1270                 break;
1271         }
1272
1273         case USB_REQ_CLEAR_FEATURE: {
1274                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1275                         if (feature_is_dev_remote_wakeup(crq))
1276                                 udc->devstatus
1277                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1278                         else
1279                                 /* Can't CLEAR_FEATURE TEST_MODE */
1280                                 goto stall;
1281                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1282                         struct usba_ep *target;
1283
1284                         if (crq->wLength != cpu_to_le16(0)
1285                                         || !feature_is_ep_halt(crq))
1286                                 goto stall;
1287                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1288                         if (!target)
1289                                 goto stall;
1290
1291                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1292                         if (target->index != 0)
1293                                 usba_ep_writel(target, CLR_STA,
1294                                                 USBA_TOGGLE_CLR);
1295                 } else {
1296                         goto delegate;
1297                 }
1298
1299                 send_status(udc, ep);
1300                 break;
1301         }
1302
1303         case USB_REQ_SET_FEATURE: {
1304                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1305                         if (feature_is_dev_test_mode(crq)) {
1306                                 send_status(udc, ep);
1307                                 ep->state = STATUS_STAGE_TEST;
1308                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1309                                 return 0;
1310                         } else if (feature_is_dev_remote_wakeup(crq)) {
1311                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1312                         } else {
1313                                 goto stall;
1314                         }
1315                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1316                         struct usba_ep *target;
1317
1318                         if (crq->wLength != cpu_to_le16(0)
1319                                         || !feature_is_ep_halt(crq))
1320                                 goto stall;
1321
1322                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1323                         if (!target)
1324                                 goto stall;
1325
1326                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1327                 } else
1328                         goto delegate;
1329
1330                 send_status(udc, ep);
1331                 break;
1332         }
1333
1334         case USB_REQ_SET_ADDRESS:
1335                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1336                         goto delegate;
1337
1338                 set_address(udc, le16_to_cpu(crq->wValue));
1339                 send_status(udc, ep);
1340                 ep->state = STATUS_STAGE_ADDR;
1341                 break;
1342
1343         default:
1344 delegate:
1345                 spin_unlock(&udc->lock);
1346                 retval = udc->driver->setup(&udc->gadget, crq);
1347                 spin_lock(&udc->lock);
1348         }
1349
1350         return retval;
1351
1352 stall:
1353         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1354                 "halting endpoint...\n",
1355                 ep->ep.name, crq->bRequestType, crq->bRequest,
1356                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1357                 le16_to_cpu(crq->wLength));
1358         set_protocol_stall(udc, ep);
1359         return -1;
1360 }
1361
1362 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1363 {
1364         struct usba_request *req;
1365         u32 epstatus;
1366         u32 epctrl;
1367
1368 restart:
1369         epstatus = usba_ep_readl(ep, STA);
1370         epctrl = usba_ep_readl(ep, CTL);
1371
1372         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1373                         ep->ep.name, ep->state, epstatus, epctrl);
1374
1375         req = NULL;
1376         if (!list_empty(&ep->queue))
1377                 req = list_entry(ep->queue.next,
1378                                  struct usba_request, queue);
1379
1380         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1381                 if (req->submitted)
1382                         next_fifo_transaction(ep, req);
1383                 else
1384                         submit_request(ep, req);
1385
1386                 if (req->last_transaction) {
1387                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1388                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1389                 }
1390                 goto restart;
1391         }
1392         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1393                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1394
1395                 switch (ep->state) {
1396                 case DATA_STAGE_IN:
1397                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1398                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1399                         ep->state = STATUS_STAGE_OUT;
1400                         break;
1401                 case STATUS_STAGE_ADDR:
1402                         /* Activate our new address */
1403                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1404                                                 | USBA_FADDR_EN));
1405                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1406                         ep->state = WAIT_FOR_SETUP;
1407                         break;
1408                 case STATUS_STAGE_IN:
1409                         if (req) {
1410                                 list_del_init(&req->queue);
1411                                 request_complete(ep, req, 0);
1412                                 submit_next_request(ep);
1413                         }
1414                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1415                         ep->state = WAIT_FOR_SETUP;
1416                         break;
1417                 case STATUS_STAGE_TEST:
1418                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1419                         ep->state = WAIT_FOR_SETUP;
1420                         if (do_test_mode(udc))
1421                                 set_protocol_stall(udc, ep);
1422                         break;
1423                 default:
1424                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1425                                 "halting endpoint...\n",
1426                                 ep->ep.name, ep->state);
1427                         set_protocol_stall(udc, ep);
1428                         break;
1429                 }
1430
1431                 goto restart;
1432         }
1433         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1434                 switch (ep->state) {
1435                 case STATUS_STAGE_OUT:
1436                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1437                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1438
1439                         if (req) {
1440                                 list_del_init(&req->queue);
1441                                 request_complete(ep, req, 0);
1442                         }
1443                         ep->state = WAIT_FOR_SETUP;
1444                         break;
1445
1446                 case DATA_STAGE_OUT:
1447                         receive_data(ep);
1448                         break;
1449
1450                 default:
1451                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1452                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1453                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1454                                 "halting endpoint...\n",
1455                                 ep->ep.name, ep->state);
1456                         set_protocol_stall(udc, ep);
1457                         break;
1458                 }
1459
1460                 goto restart;
1461         }
1462         if (epstatus & USBA_RX_SETUP) {
1463                 union {
1464                         struct usb_ctrlrequest crq;
1465                         unsigned long data[2];
1466                 } crq;
1467                 unsigned int pkt_len;
1468                 int ret;
1469
1470                 if (ep->state != WAIT_FOR_SETUP) {
1471                         /*
1472                          * Didn't expect a SETUP packet at this
1473                          * point. Clean up any pending requests (which
1474                          * may be successful).
1475                          */
1476                         int status = -EPROTO;
1477
1478                         /*
1479                          * RXRDY and TXCOMP are dropped when SETUP
1480                          * packets arrive.  Just pretend we received
1481                          * the status packet.
1482                          */
1483                         if (ep->state == STATUS_STAGE_OUT
1484                                         || ep->state == STATUS_STAGE_IN) {
1485                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1486                                 status = 0;
1487                         }
1488
1489                         if (req) {
1490                                 list_del_init(&req->queue);
1491                                 request_complete(ep, req, status);
1492                         }
1493                 }
1494
1495                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1496                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1497                 if (pkt_len != sizeof(crq)) {
1498                         pr_warning("udc: Invalid packet length %u "
1499                                 "(expected %zu)\n", pkt_len, sizeof(crq));
1500                         set_protocol_stall(udc, ep);
1501                         return;
1502                 }
1503
1504                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1505                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1506
1507                 /* Free up one bank in the FIFO so that we can
1508                  * generate or receive a reply right away. */
1509                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1510
1511                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1512                         ep->state, crq.crq.bRequestType,
1513                         crq.crq.bRequest); */
1514
1515                 if (crq.crq.bRequestType & USB_DIR_IN) {
1516                         /*
1517                          * The USB 2.0 spec states that "if wLength is
1518                          * zero, there is no data transfer phase."
1519                          * However, testusb #14 seems to actually
1520                          * expect a data phase even if wLength = 0...
1521                          */
1522                         ep->state = DATA_STAGE_IN;
1523                 } else {
1524                         if (crq.crq.wLength != cpu_to_le16(0))
1525                                 ep->state = DATA_STAGE_OUT;
1526                         else
1527                                 ep->state = STATUS_STAGE_IN;
1528                 }
1529
1530                 ret = -1;
1531                 if (ep->index == 0)
1532                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1533                 else {
1534                         spin_unlock(&udc->lock);
1535                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1536                         spin_lock(&udc->lock);
1537                 }
1538
1539                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1540                         crq.crq.bRequestType, crq.crq.bRequest,
1541                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1542
1543                 if (ret < 0) {
1544                         /* Let the host know that we failed */
1545                         set_protocol_stall(udc, ep);
1546                 }
1547         }
1548 }
1549
1550 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1551 {
1552         struct usba_request *req;
1553         u32 epstatus;
1554         u32 epctrl;
1555
1556         epstatus = usba_ep_readl(ep, STA);
1557         epctrl = usba_ep_readl(ep, CTL);
1558
1559         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1560
1561         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1562                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1563
1564                 if (list_empty(&ep->queue)) {
1565                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1566                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1567                         return;
1568                 }
1569
1570                 req = list_entry(ep->queue.next, struct usba_request, queue);
1571
1572                 if (req->using_dma) {
1573                         /* Send a zero-length packet */
1574                         usba_ep_writel(ep, SET_STA,
1575                                         USBA_TX_PK_RDY);
1576                         usba_ep_writel(ep, CTL_DIS,
1577                                         USBA_TX_PK_RDY);
1578                         list_del_init(&req->queue);
1579                         submit_next_request(ep);
1580                         request_complete(ep, req, 0);
1581                 } else {
1582                         if (req->submitted)
1583                                 next_fifo_transaction(ep, req);
1584                         else
1585                                 submit_request(ep, req);
1586
1587                         if (req->last_transaction) {
1588                                 list_del_init(&req->queue);
1589                                 submit_next_request(ep);
1590                                 request_complete(ep, req, 0);
1591                         }
1592                 }
1593
1594                 epstatus = usba_ep_readl(ep, STA);
1595                 epctrl = usba_ep_readl(ep, CTL);
1596         }
1597         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1598                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1599                 receive_data(ep);
1600                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1601         }
1602 }
1603
1604 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1605 {
1606         struct usba_request *req;
1607         u32 status, control, pending;
1608
1609         status = usba_dma_readl(ep, STATUS);
1610         control = usba_dma_readl(ep, CONTROL);
1611 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1612         ep->last_dma_status = status;
1613 #endif
1614         pending = status & control;
1615         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1616
1617         if (status & USBA_DMA_CH_EN) {
1618                 dev_err(&udc->pdev->dev,
1619                         "DMA_CH_EN is set after transfer is finished!\n");
1620                 dev_err(&udc->pdev->dev,
1621                         "status=%#08x, pending=%#08x, control=%#08x\n",
1622                         status, pending, control);
1623
1624                 /*
1625                  * try to pretend nothing happened. We might have to
1626                  * do something here...
1627                  */
1628         }
1629
1630         if (list_empty(&ep->queue))
1631                 /* Might happen if a reset comes along at the right moment */
1632                 return;
1633
1634         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1635                 req = list_entry(ep->queue.next, struct usba_request, queue);
1636                 usba_update_req(ep, req, status);
1637
1638                 list_del_init(&req->queue);
1639                 submit_next_request(ep);
1640                 request_complete(ep, req, 0);
1641         }
1642 }
1643
1644 static irqreturn_t usba_udc_irq(int irq, void *devid)
1645 {
1646         struct usba_udc *udc = devid;
1647         u32 status;
1648         u32 dma_status;
1649         u32 ep_status;
1650
1651         spin_lock(&udc->lock);
1652
1653         status = usba_readl(udc, INT_STA);
1654         DBG(DBG_INT, "irq, status=%#08x\n", status);
1655
1656         if (status & USBA_DET_SUSPEND) {
1657                 toggle_bias(0);
1658                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1659                 DBG(DBG_BUS, "Suspend detected\n");
1660                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1661                                 && udc->driver && udc->driver->suspend) {
1662                         spin_unlock(&udc->lock);
1663                         udc->driver->suspend(&udc->gadget);
1664                         spin_lock(&udc->lock);
1665                 }
1666         }
1667
1668         if (status & USBA_WAKE_UP) {
1669                 toggle_bias(1);
1670                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1671                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1672         }
1673
1674         if (status & USBA_END_OF_RESUME) {
1675                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1676                 DBG(DBG_BUS, "Resume detected\n");
1677                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1678                                 && udc->driver && udc->driver->resume) {
1679                         spin_unlock(&udc->lock);
1680                         udc->driver->resume(&udc->gadget);
1681                         spin_lock(&udc->lock);
1682                 }
1683         }
1684
1685         dma_status = USBA_BFEXT(DMA_INT, status);
1686         if (dma_status) {
1687                 int i;
1688
1689                 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1690                         if (dma_status & (1 << i))
1691                                 usba_dma_irq(udc, &usba_ep[i]);
1692         }
1693
1694         ep_status = USBA_BFEXT(EPT_INT, status);
1695         if (ep_status) {
1696                 int i;
1697
1698                 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1699                         if (ep_status & (1 << i)) {
1700                                 if (ep_is_control(&usba_ep[i]))
1701                                         usba_control_irq(udc, &usba_ep[i]);
1702                                 else
1703                                         usba_ep_irq(udc, &usba_ep[i]);
1704                         }
1705         }
1706
1707         if (status & USBA_END_OF_RESET) {
1708                 struct usba_ep *ep0;
1709
1710                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1711                 reset_all_endpoints(udc);
1712
1713                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1714                                 && udc->driver->disconnect) {
1715                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1716                         spin_unlock(&udc->lock);
1717                         udc->driver->disconnect(&udc->gadget);
1718                         spin_lock(&udc->lock);
1719                 }
1720
1721                 if (status & USBA_HIGH_SPEED)
1722                         udc->gadget.speed = USB_SPEED_HIGH;
1723                 else
1724                         udc->gadget.speed = USB_SPEED_FULL;
1725                 DBG(DBG_BUS, "%s bus reset detected\n",
1726                     usb_speed_string(udc->gadget.speed));
1727
1728                 ep0 = &usba_ep[0];
1729                 ep0->desc = &usba_ep0_desc;
1730                 ep0->state = WAIT_FOR_SETUP;
1731                 usba_ep_writel(ep0, CFG,
1732                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1733                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1734                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1735                 usba_ep_writel(ep0, CTL_ENB,
1736                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1737                 usba_writel(udc, INT_ENB,
1738                                 (usba_readl(udc, INT_ENB)
1739                                 | USBA_BF(EPT_INT, 1)
1740                                 | USBA_DET_SUSPEND
1741                                 | USBA_END_OF_RESUME));
1742
1743                 /*
1744                  * Unclear why we hit this irregularly, e.g. in usbtest,
1745                  * but it's clearly harmless...
1746                  */
1747                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1748                         dev_dbg(&udc->pdev->dev,
1749                                  "ODD: EP0 configuration is invalid!\n");
1750         }
1751
1752         spin_unlock(&udc->lock);
1753
1754         return IRQ_HANDLED;
1755 }
1756
1757 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1758 {
1759         struct usba_udc *udc = devid;
1760         int vbus;
1761
1762         /* debounce */
1763         udelay(10);
1764
1765         spin_lock(&udc->lock);
1766
1767         /* May happen if Vbus pin toggles during probe() */
1768         if (!udc->driver)
1769                 goto out;
1770
1771         vbus = vbus_is_present(udc);
1772         if (vbus != udc->vbus_prev) {
1773                 if (vbus) {
1774                         toggle_bias(1);
1775                         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1776                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1777                 } else {
1778                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1779                         reset_all_endpoints(udc);
1780                         toggle_bias(0);
1781                         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1782                         if (udc->driver->disconnect) {
1783                                 spin_unlock(&udc->lock);
1784                                 udc->driver->disconnect(&udc->gadget);
1785                                 spin_lock(&udc->lock);
1786                         }
1787                 }
1788                 udc->vbus_prev = vbus;
1789         }
1790
1791 out:
1792         spin_unlock(&udc->lock);
1793
1794         return IRQ_HANDLED;
1795 }
1796
1797 static int atmel_usba_start(struct usb_gadget_driver *driver,
1798                 int (*bind)(struct usb_gadget *))
1799 {
1800         struct usba_udc *udc = &the_udc;
1801         unsigned long flags;
1802         int ret;
1803
1804         if (!udc->pdev)
1805                 return -ENODEV;
1806
1807         spin_lock_irqsave(&udc->lock, flags);
1808         if (udc->driver) {
1809                 spin_unlock_irqrestore(&udc->lock, flags);
1810                 return -EBUSY;
1811         }
1812
1813         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1814         udc->driver = driver;
1815         udc->gadget.dev.driver = &driver->driver;
1816         spin_unlock_irqrestore(&udc->lock, flags);
1817
1818         clk_enable(udc->pclk);
1819         clk_enable(udc->hclk);
1820
1821         ret = bind(&udc->gadget);
1822         if (ret) {
1823                 DBG(DBG_ERR, "Could not bind to driver %s: error %d\n",
1824                         driver->driver.name, ret);
1825                 goto err_driver_bind;
1826         }
1827
1828         DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1829
1830         udc->vbus_prev = 0;
1831         if (gpio_is_valid(udc->vbus_pin))
1832                 enable_irq(gpio_to_irq(udc->vbus_pin));
1833
1834         /* If Vbus is present, enable the controller and wait for reset */
1835         spin_lock_irqsave(&udc->lock, flags);
1836         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1837                 toggle_bias(1);
1838                 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1839                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1840         }
1841         spin_unlock_irqrestore(&udc->lock, flags);
1842
1843         return 0;
1844
1845 err_driver_bind:
1846         udc->driver = NULL;
1847         udc->gadget.dev.driver = NULL;
1848         return ret;
1849 }
1850
1851 static int atmel_usba_stop(struct usb_gadget_driver *driver)
1852 {
1853         struct usba_udc *udc = &the_udc;
1854         unsigned long flags;
1855
1856         if (!udc->pdev)
1857                 return -ENODEV;
1858         if (driver != udc->driver || !driver->unbind)
1859                 return -EINVAL;
1860
1861         if (gpio_is_valid(udc->vbus_pin))
1862                 disable_irq(gpio_to_irq(udc->vbus_pin));
1863
1864         spin_lock_irqsave(&udc->lock, flags);
1865         udc->gadget.speed = USB_SPEED_UNKNOWN;
1866         reset_all_endpoints(udc);
1867         spin_unlock_irqrestore(&udc->lock, flags);
1868
1869         /* This will also disable the DP pullup */
1870         toggle_bias(0);
1871         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1872
1873         if (udc->driver->disconnect)
1874                 udc->driver->disconnect(&udc->gadget);
1875
1876         driver->unbind(&udc->gadget);
1877         udc->gadget.dev.driver = NULL;
1878         udc->driver = NULL;
1879
1880         clk_disable(udc->hclk);
1881         clk_disable(udc->pclk);
1882
1883         DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1884
1885         return 0;
1886 }
1887
1888 static int __init usba_udc_probe(struct platform_device *pdev)
1889 {
1890         struct usba_platform_data *pdata = pdev->dev.platform_data;
1891         struct resource *regs, *fifo;
1892         struct clk *pclk, *hclk;
1893         struct usba_udc *udc = &the_udc;
1894         int irq, ret, i;
1895
1896         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1897         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1898         if (!regs || !fifo || !pdata)
1899                 return -ENXIO;
1900
1901         irq = platform_get_irq(pdev, 0);
1902         if (irq < 0)
1903                 return irq;
1904
1905         pclk = clk_get(&pdev->dev, "pclk");
1906         if (IS_ERR(pclk))
1907                 return PTR_ERR(pclk);
1908         hclk = clk_get(&pdev->dev, "hclk");
1909         if (IS_ERR(hclk)) {
1910                 ret = PTR_ERR(hclk);
1911                 goto err_get_hclk;
1912         }
1913
1914         spin_lock_init(&udc->lock);
1915         udc->pdev = pdev;
1916         udc->pclk = pclk;
1917         udc->hclk = hclk;
1918         udc->vbus_pin = -ENODEV;
1919
1920         ret = -ENOMEM;
1921         udc->regs = ioremap(regs->start, resource_size(regs));
1922         if (!udc->regs) {
1923                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1924                 goto err_map_regs;
1925         }
1926         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1927                  (unsigned long)regs->start, udc->regs);
1928         udc->fifo = ioremap(fifo->start, resource_size(fifo));
1929         if (!udc->fifo) {
1930                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1931                 goto err_map_fifo;
1932         }
1933         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1934                  (unsigned long)fifo->start, udc->fifo);
1935
1936         device_initialize(&udc->gadget.dev);
1937         udc->gadget.dev.parent = &pdev->dev;
1938         udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1939
1940         platform_set_drvdata(pdev, udc);
1941
1942         /* Make sure we start from a clean slate */
1943         clk_enable(pclk);
1944         toggle_bias(0);
1945         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1946         clk_disable(pclk);
1947
1948         usba_ep = kzalloc(sizeof(struct usba_ep) * pdata->num_ep,
1949                           GFP_KERNEL);
1950         if (!usba_ep)
1951                 goto err_alloc_ep;
1952
1953         the_udc.gadget.ep0 = &usba_ep[0].ep;
1954
1955         INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1956         usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1957         usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1958         usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1959         usba_ep[0].ep.ops = &usba_ep_ops;
1960         usba_ep[0].ep.name = pdata->ep[0].name;
1961         usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
1962         usba_ep[0].udc = &the_udc;
1963         INIT_LIST_HEAD(&usba_ep[0].queue);
1964         usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
1965         usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
1966         usba_ep[0].index = pdata->ep[0].index;
1967         usba_ep[0].can_dma = pdata->ep[0].can_dma;
1968         usba_ep[0].can_isoc = pdata->ep[0].can_isoc;
1969
1970         for (i = 1; i < pdata->num_ep; i++) {
1971                 struct usba_ep *ep = &usba_ep[i];
1972
1973                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1974                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1975                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1976                 ep->ep.ops = &usba_ep_ops;
1977                 ep->ep.name = pdata->ep[i].name;
1978                 ep->ep.maxpacket = pdata->ep[i].fifo_size;
1979                 ep->udc = &the_udc;
1980                 INIT_LIST_HEAD(&ep->queue);
1981                 ep->fifo_size = pdata->ep[i].fifo_size;
1982                 ep->nr_banks = pdata->ep[i].nr_banks;
1983                 ep->index = pdata->ep[i].index;
1984                 ep->can_dma = pdata->ep[i].can_dma;
1985                 ep->can_isoc = pdata->ep[i].can_isoc;
1986
1987                 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1988         }
1989
1990         ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
1991         if (ret) {
1992                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
1993                         irq, ret);
1994                 goto err_request_irq;
1995         }
1996         udc->irq = irq;
1997
1998         ret = device_add(&udc->gadget.dev);
1999         if (ret) {
2000                 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
2001                 goto err_device_add;
2002         }
2003
2004         if (gpio_is_valid(pdata->vbus_pin)) {
2005                 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
2006                         udc->vbus_pin = pdata->vbus_pin;
2007                         udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
2008
2009                         ret = request_irq(gpio_to_irq(udc->vbus_pin),
2010                                         usba_vbus_irq, 0,
2011                                         "atmel_usba_udc", udc);
2012                         if (ret) {
2013                                 gpio_free(udc->vbus_pin);
2014                                 udc->vbus_pin = -ENODEV;
2015                                 dev_warn(&udc->pdev->dev,
2016                                          "failed to request vbus irq; "
2017                                          "assuming always on\n");
2018                         } else {
2019                                 disable_irq(gpio_to_irq(udc->vbus_pin));
2020                         }
2021                 } else {
2022                         /* gpio_request fail so use -EINVAL for gpio_is_valid */
2023                         udc->vbus_pin = -EINVAL;
2024                 }
2025         }
2026
2027         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2028         if (ret)
2029                 goto err_add_udc;
2030
2031         usba_init_debugfs(udc);
2032         for (i = 1; i < pdata->num_ep; i++)
2033                 usba_ep_init_debugfs(udc, &usba_ep[i]);
2034
2035         return 0;
2036
2037 err_add_udc:
2038         if (gpio_is_valid(pdata->vbus_pin)) {
2039                 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2040                 gpio_free(udc->vbus_pin);
2041         }
2042
2043         device_unregister(&udc->gadget.dev);
2044
2045 err_device_add:
2046         free_irq(irq, udc);
2047 err_request_irq:
2048         kfree(usba_ep);
2049 err_alloc_ep:
2050         iounmap(udc->fifo);
2051 err_map_fifo:
2052         iounmap(udc->regs);
2053 err_map_regs:
2054         clk_put(hclk);
2055 err_get_hclk:
2056         clk_put(pclk);
2057
2058         platform_set_drvdata(pdev, NULL);
2059
2060         return ret;
2061 }
2062
2063 static int __exit usba_udc_remove(struct platform_device *pdev)
2064 {
2065         struct usba_udc *udc;
2066         int i;
2067         struct usba_platform_data *pdata = pdev->dev.platform_data;
2068
2069         udc = platform_get_drvdata(pdev);
2070
2071         usb_del_gadget_udc(&udc->gadget);
2072
2073         for (i = 1; i < pdata->num_ep; i++)
2074                 usba_ep_cleanup_debugfs(&usba_ep[i]);
2075         usba_cleanup_debugfs(udc);
2076
2077         if (gpio_is_valid(udc->vbus_pin)) {
2078                 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2079                 gpio_free(udc->vbus_pin);
2080         }
2081
2082         free_irq(udc->irq, udc);
2083         kfree(usba_ep);
2084         iounmap(udc->fifo);
2085         iounmap(udc->regs);
2086         clk_put(udc->hclk);
2087         clk_put(udc->pclk);
2088
2089         device_unregister(&udc->gadget.dev);
2090
2091         return 0;
2092 }
2093
2094 static struct platform_driver udc_driver = {
2095         .remove         = __exit_p(usba_udc_remove),
2096         .driver         = {
2097                 .name           = "atmel_usba_udc",
2098                 .owner          = THIS_MODULE,
2099         },
2100 };
2101
2102 static int __init udc_init(void)
2103 {
2104         return platform_driver_probe(&udc_driver, usba_udc_probe);
2105 }
2106 module_init(udc_init);
2107
2108 static void __exit udc_exit(void)
2109 {
2110         platform_driver_unregister(&udc_driver);
2111 }
2112 module_exit(udc_exit);
2113
2114 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2115 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2116 MODULE_LICENSE("GPL");
2117 MODULE_ALIAS("platform:atmel_usba_udc");