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 #include <linux/platform_data/atmel.h>
  25
  26 #include <asm/gpio.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         ep->ep.desc = desc;
 603         ep->ep.maxpacket = maxpacket;
 604
 605         usba_ep_writel(ep, CFG, ept_cfg);
 606         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 607
 608         if (ep->can_dma) {
 609                 u32 ctrl;
 610
 611                 usba_writel(udc, INT_ENB,
 612                                 (usba_readl(udc, INT_ENB)
 613                                         | USBA_BF(EPT_INT, 1 << ep->index)
 614                                         | USBA_BF(DMA_INT, 1 << ep->index)));
 615                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 616                 usba_ep_writel(ep, CTL_ENB, ctrl);
 617         } else {
 618                 usba_writel(udc, INT_ENB,
 619                                 (usba_readl(udc, INT_ENB)
 620                                         | USBA_BF(EPT_INT, 1 << ep->index)));
 621         }
 622
 623         spin_unlock_irqrestore(&udc->lock, flags);
 624
 625         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 626                         (unsigned long)usba_ep_readl(ep, CFG));
 627         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 628                         (unsigned long)usba_readl(udc, INT_ENB));
 629
 630         return 0;
 631 }
 632
 633 static int usba_ep_disable(struct usb_ep *_ep)
 634 {
 635         struct usba_ep *ep = to_usba_ep(_ep);
 636         struct usba_udc *udc = ep->udc;
 637         LIST_HEAD(req_list);
 638         unsigned long flags;
 639
 640         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 641
 642         spin_lock_irqsave(&udc->lock, flags);
 643
 644         if (!ep->ep.desc) {
 645                 spin_unlock_irqrestore(&udc->lock, flags);
 646                 /* REVISIT because this driver disables endpoints in
 647                  * reset_all_endpoints() before calling disconnect(),
 648                  * most gadget drivers would trigger this non-error ...
 649                  */
 650                 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
 651                         DBG(DBG_ERR, "ep_disable: %s not enabled\n",
 652                                         ep->ep.name);
 653                 return -EINVAL;
 654         }
 655         ep->ep.desc = NULL;
 656
 657         list_splice_init(&ep->queue, &req_list);
 658         if (ep->can_dma) {
 659                 usba_dma_writel(ep, CONTROL, 0);
 660                 usba_dma_writel(ep, ADDRESS, 0);
 661                 usba_dma_readl(ep, STATUS);
 662         }
 663         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 664         usba_writel(udc, INT_ENB,
 665                         usba_readl(udc, INT_ENB)
 666                         & ~USBA_BF(EPT_INT, 1 << ep->index));
 667
 668         request_complete_list(ep, &req_list, -ESHUTDOWN);
 669
 670         spin_unlock_irqrestore(&udc->lock, flags);
 671
 672         return 0;
 673 }
 674
 675 static struct usb_request *
 676 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 677 {
 678         struct usba_request *req;
 679
 680         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 681
 682         req = kzalloc(sizeof(*req), gfp_flags);
 683         if (!req)
 684                 return NULL;
 685
 686         INIT_LIST_HEAD(&req->queue);
 687         req->req.dma = DMA_ADDR_INVALID;
 688
 689         return &req->req;
 690 }
 691
 692 static void
 693 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 694 {
 695         struct usba_request *req = to_usba_req(_req);
 696
 697         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 698
 699         kfree(req);
 700 }
 701
 702 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 703                 struct usba_request *req, gfp_t gfp_flags)
 704 {
 705         unsigned long flags;
 706         int ret;
 707
 708         DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
 709                 ep->ep.name, req->req.length, req->req.dma,
 710                 req->req.zero ? 'Z' : 'z',
 711                 req->req.short_not_ok ? 'S' : 's',
 712                 req->req.no_interrupt ? 'I' : 'i');
 713
 714         if (req->req.length > 0x10000) {
 715                 /* Lengths from 0 to 65536 (inclusive) are supported */
 716                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 717                 return -EINVAL;
 718         }
 719
 720         req->using_dma = 1;
 721
 722         if (req->req.dma == DMA_ADDR_INVALID) {
 723                 req->req.dma = dma_map_single(
 724                         &udc->pdev->dev, req->req.buf, req->req.length,
 725                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 726                 req->mapped = 1;
 727         } else {
 728                 dma_sync_single_for_device(
 729                         &udc->pdev->dev, req->req.dma, req->req.length,
 730                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 731                 req->mapped = 0;
 732         }
 733
 734         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 735                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 736                         | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 737
 738         if (ep->is_in)
 739                 req->ctrl |= USBA_DMA_END_BUF_EN;
 740
 741         /*
 742          * Add this request to the queue and submit for DMA if
 743          * possible. Check if we're still alive first -- we may have
 744          * received a reset since last time we checked.
 745          */
 746         ret = -ESHUTDOWN;
 747         spin_lock_irqsave(&udc->lock, flags);
 748         if (ep->ep.desc) {
 749                 if (list_empty(&ep->queue))
 750                         submit_request(ep, req);
 751
 752                 list_add_tail(&req->queue, &ep->queue);
 753                 ret = 0;
 754         }
 755         spin_unlock_irqrestore(&udc->lock, flags);
 756
 757         return ret;
 758 }
 759
 760 static int
 761 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 762 {
 763         struct usba_request *req = to_usba_req(_req);
 764         struct usba_ep *ep = to_usba_ep(_ep);
 765         struct usba_udc *udc = ep->udc;
 766         unsigned long flags;
 767         int ret;
 768
 769         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 770                         ep->ep.name, req, _req->length);
 771
 772         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
 773             !ep->ep.desc)
 774                 return -ESHUTDOWN;
 775
 776         req->submitted = 0;
 777         req->using_dma = 0;
 778         req->last_transaction = 0;
 779
 780         _req->status = -EINPROGRESS;
 781         _req->actual = 0;
 782
 783         if (ep->can_dma)
 784                 return queue_dma(udc, ep, req, gfp_flags);
 785
 786         /* May have received a reset since last time we checked */
 787         ret = -ESHUTDOWN;
 788         spin_lock_irqsave(&udc->lock, flags);
 789         if (ep->ep.desc) {
 790                 list_add_tail(&req->queue, &ep->queue);
 791
 792                 if ((!ep_is_control(ep) && ep->is_in) ||
 793                         (ep_is_control(ep)
 794                                 && (ep->state == DATA_STAGE_IN
 795                                         || ep->state == STATUS_STAGE_IN)))
 796                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 797                 else
 798                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 799                 ret = 0;
 800         }
 801         spin_unlock_irqrestore(&udc->lock, flags);
 802
 803         return ret;
 804 }
 805
 806 static void
 807 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 808 {
 809         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 810 }
 811
 812 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 813 {
 814         unsigned int timeout;
 815         u32 status;
 816
 817         /*
 818          * Stop the DMA controller. When writing both CH_EN
 819          * and LINK to 0, the other bits are not affected.
 820          */
 821         usba_dma_writel(ep, CONTROL, 0);
 822
 823         /* Wait for the FIFO to empty */
 824         for (timeout = 40; timeout; --timeout) {
 825                 status = usba_dma_readl(ep, STATUS);
 826                 if (!(status & USBA_DMA_CH_EN))
 827                         break;
 828                 udelay(1);
 829         }
 830
 831         if (pstatus)
 832                 *pstatus = status;
 833
 834         if (timeout == 0) {
 835                 dev_err(&ep->udc->pdev->dev,
 836                         "%s: timed out waiting for DMA FIFO to empty\n",
 837                         ep->ep.name);
 838                 return -ETIMEDOUT;
 839         }
 840
 841         return 0;
 842 }
 843
 844 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 845 {
 846         struct usba_ep *ep = to_usba_ep(_ep);
 847         struct usba_udc *udc = ep->udc;
 848         struct usba_request *req = to_usba_req(_req);
 849         unsigned long flags;
 850         u32 status;
 851
 852         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 853                         ep->ep.name, req);
 854
 855         spin_lock_irqsave(&udc->lock, flags);
 856
 857         if (req->using_dma) {
 858                 /*
 859                  * If this request is currently being transferred,
 860                  * stop the DMA controller and reset the FIFO.
 861                  */
 862                 if (ep->queue.next == &req->queue) {
 863                         status = usba_dma_readl(ep, STATUS);
 864                         if (status & USBA_DMA_CH_EN)
 865                                 stop_dma(ep, &status);
 866
 867 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 868                         ep->last_dma_status = status;
 869 #endif
 870
 871                         usba_writel(udc, EPT_RST, 1 << ep->index);
 872
 873                         usba_update_req(ep, req, status);
 874                 }
 875         }
 876
 877         /*
 878          * Errors should stop the queue from advancing until the
 879          * completion function returns.
 880          */
 881         list_del_init(&req->queue);
 882
 883         request_complete(ep, req, -ECONNRESET);
 884
 885         /* Process the next request if any */
 886         submit_next_request(ep);
 887         spin_unlock_irqrestore(&udc->lock, flags);
 888
 889         return 0;
 890 }
 891
 892 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 893 {
 894         struct usba_ep *ep = to_usba_ep(_ep);
 895         struct usba_udc *udc = ep->udc;
 896         unsigned long flags;
 897         int ret = 0;
 898
 899         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 900                         value ? "set" : "clear");
 901
 902         if (!ep->ep.desc) {
 903                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 904                                 ep->ep.name);
 905                 return -ENODEV;
 906         }
 907         if (ep->is_isoc) {
 908                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 909                                 ep->ep.name);
 910                 return -ENOTTY;
 911         }
 912
 913         spin_lock_irqsave(&udc->lock, flags);
 914
 915         /*
 916          * We can't halt IN endpoints while there are still data to be
 917          * transferred
 918          */
 919         if (!list_empty(&ep->queue)
 920                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 921                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 922                 ret = -EAGAIN;
 923         } else {
 924                 if (value)
 925                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 926                 else
 927                         usba_ep_writel(ep, CLR_STA,
 928                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 929                 usba_ep_readl(ep, STA);
 930         }
 931
 932         spin_unlock_irqrestore(&udc->lock, flags);
 933
 934         return ret;
 935 }
 936
 937 static int usba_ep_fifo_status(struct usb_ep *_ep)
 938 {
 939         struct usba_ep *ep = to_usba_ep(_ep);
 940
 941         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 942 }
 943
 944 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 945 {
 946         struct usba_ep *ep = to_usba_ep(_ep);
 947         struct usba_udc *udc = ep->udc;
 948
 949         usba_writel(udc, EPT_RST, 1 << ep->index);
 950 }
 951
 952 static const struct usb_ep_ops usba_ep_ops = {
 953         .enable         = usba_ep_enable,
 954         .disable        = usba_ep_disable,
 955         .alloc_request  = usba_ep_alloc_request,
 956         .free_request   = usba_ep_free_request,
 957         .queue          = usba_ep_queue,
 958         .dequeue        = usba_ep_dequeue,
 959         .set_halt       = usba_ep_set_halt,
 960         .fifo_status    = usba_ep_fifo_status,
 961         .fifo_flush     = usba_ep_fifo_flush,
 962 };
 963
 964 static int usba_udc_get_frame(struct usb_gadget *gadget)
 965 {
 966         struct usba_udc *udc = to_usba_udc(gadget);
 967
 968         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 969 }
 970
 971 static int usba_udc_wakeup(struct usb_gadget *gadget)
 972 {
 973         struct usba_udc *udc = to_usba_udc(gadget);
 974         unsigned long flags;
 975         u32 ctrl;
 976         int ret = -EINVAL;
 977
 978         spin_lock_irqsave(&udc->lock, flags);
 979         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 980                 ctrl = usba_readl(udc, CTRL);
 981                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 982                 ret = 0;
 983         }
 984         spin_unlock_irqrestore(&udc->lock, flags);
 985
 986         return ret;
 987 }
 988
 989 static int
 990 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 991 {
 992         struct usba_udc *udc = to_usba_udc(gadget);
 993         unsigned long flags;
 994
 995         spin_lock_irqsave(&udc->lock, flags);
 996         if (is_selfpowered)
 997                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
 998         else
 999                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1000         spin_unlock_irqrestore(&udc->lock, flags);
1001
1002         return 0;
1003 }
1004
1005 static int atmel_usba_start(struct usb_gadget *gadget,
1006                 struct usb_gadget_driver *driver);
1007 static int atmel_usba_stop(struct usb_gadget *gadget,
1008                 struct usb_gadget_driver *driver);
1009 static const struct usb_gadget_ops usba_udc_ops = {
1010         .get_frame              = usba_udc_get_frame,
1011         .wakeup                 = usba_udc_wakeup,
1012         .set_selfpowered        = usba_udc_set_selfpowered,
1013         .udc_start              = atmel_usba_start,
1014         .udc_stop               = atmel_usba_stop,
1015 };
1016
1017 static struct usb_endpoint_descriptor usba_ep0_desc = {
1018         .bLength = USB_DT_ENDPOINT_SIZE,
1019         .bDescriptorType = USB_DT_ENDPOINT,
1020         .bEndpointAddress = 0,
1021         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1022         .wMaxPacketSize = cpu_to_le16(64),
1023         /* FIXME: I have no idea what to put here */
1024         .bInterval = 1,
1025 };
1026
1027 static void nop_release(struct device *dev)
1028 {
1029
1030 }
1031
1032 static struct usba_udc the_udc = {
1033         .gadget = {
1034                 .ops            = &usba_udc_ops,
1035                 .ep_list        = LIST_HEAD_INIT(the_udc.gadget.ep_list),
1036                 .max_speed      = USB_SPEED_HIGH,
1037                 .name           = "atmel_usba_udc",
1038                 .dev    = {
1039                         .init_name      = "gadget",
1040                         .release        = nop_release,
1041                 },
1042         },
1043 };
1044
1045 /*
1046  * Called with interrupts disabled and udc->lock held.
1047  */
1048 static void reset_all_endpoints(struct usba_udc *udc)
1049 {
1050         struct usba_ep *ep;
1051         struct usba_request *req, *tmp_req;
1052
1053         usba_writel(udc, EPT_RST, ~0UL);
1054
1055         ep = to_usba_ep(udc->gadget.ep0);
1056         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1057                 list_del_init(&req->queue);
1058                 request_complete(ep, req, -ECONNRESET);
1059         }
1060
1061         /* NOTE:  normally, the next call to the gadget driver is in
1062          * charge of disabling endpoints... usually disconnect().
1063          * The exception would be entering a high speed test mode.
1064          *
1065          * FIXME remove this code ... and retest thoroughly.
1066          */
1067         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1068                 if (ep->ep.desc) {
1069                         spin_unlock(&udc->lock);
1070                         usba_ep_disable(&ep->ep);
1071                         spin_lock(&udc->lock);
1072                 }
1073         }
1074 }
1075
1076 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1077 {
1078         struct usba_ep *ep;
1079
1080         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1081                 return to_usba_ep(udc->gadget.ep0);
1082
1083         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1084                 u8 bEndpointAddress;
1085
1086                 if (!ep->ep.desc)
1087                         continue;
1088                 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1089                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1090                         continue;
1091                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1092                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1093                         return ep;
1094         }
1095
1096         return NULL;
1097 }
1098
1099 /* Called with interrupts disabled and udc->lock held */
1100 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1101 {
1102         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1103         ep->state = WAIT_FOR_SETUP;
1104 }
1105
1106 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1107 {
1108         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1109                 return 1;
1110         return 0;
1111 }
1112
1113 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1114 {
1115         u32 regval;
1116
1117         DBG(DBG_BUS, "setting address %u...\n", addr);
1118         regval = usba_readl(udc, CTRL);
1119         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1120         usba_writel(udc, CTRL, regval);
1121 }
1122
1123 static int do_test_mode(struct usba_udc *udc)
1124 {
1125         static const char test_packet_buffer[] = {
1126                 /* JKJKJKJK * 9 */
1127                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1128                 /* JJKKJJKK * 8 */
1129                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1130                 /* JJKKJJKK * 8 */
1131                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1132                 /* JJJJJJJKKKKKKK * 8 */
1133                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1134                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1135                 /* JJJJJJJK * 8 */
1136                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1137                 /* {JKKKKKKK * 10}, JK */
1138                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1139         };
1140         struct usba_ep *ep;
1141         struct device *dev = &udc->pdev->dev;
1142         int test_mode;
1143
1144         test_mode = udc->test_mode;
1145
1146         /* Start from a clean slate */
1147         reset_all_endpoints(udc);
1148
1149         switch (test_mode) {
1150         case 0x0100:
1151                 /* Test_J */
1152                 usba_writel(udc, TST, USBA_TST_J_MODE);
1153                 dev_info(dev, "Entering Test_J mode...\n");
1154                 break;
1155         case 0x0200:
1156                 /* Test_K */
1157                 usba_writel(udc, TST, USBA_TST_K_MODE);
1158                 dev_info(dev, "Entering Test_K mode...\n");
1159                 break;
1160         case 0x0300:
1161                 /*
1162                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1163                  * for Bulk IN transfers
1164                  */
1165                 ep = &usba_ep[0];
1166                 usba_writel(udc, TST,
1167                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1168                 usba_ep_writel(ep, CFG,
1169                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1170                                 | USBA_EPT_DIR_IN
1171                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1172                                 | USBA_BF(BK_NUMBER, 1));
1173                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1174                         set_protocol_stall(udc, ep);
1175                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1176                 } else {
1177                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1178                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1179                 }
1180                 break;
1181         case 0x0400:
1182                 /* Test_Packet */
1183                 ep = &usba_ep[0];
1184                 usba_ep_writel(ep, CFG,
1185                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1186                                 | USBA_EPT_DIR_IN
1187                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1188                                 | USBA_BF(BK_NUMBER, 1));
1189                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1190                         set_protocol_stall(udc, ep);
1191                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1192                 } else {
1193                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1194                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1195                         memcpy_toio(ep->fifo, test_packet_buffer,
1196                                         sizeof(test_packet_buffer));
1197                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1198                         dev_info(dev, "Entering Test_Packet mode...\n");
1199                 }
1200                 break;
1201         default:
1202                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1203                 return -EINVAL;
1204         }
1205
1206         return 0;
1207 }
1208
1209 /* Avoid overly long expressions */
1210 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1211 {
1212         if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1213                 return true;
1214         return false;
1215 }
1216
1217 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1218 {
1219         if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1220                 return true;
1221         return false;
1222 }
1223
1224 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1225 {
1226         if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1227                 return true;
1228         return false;
1229 }
1230
1231 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1232                 struct usb_ctrlrequest *crq)
1233 {
1234         int retval = 0;
1235
1236         switch (crq->bRequest) {
1237         case USB_REQ_GET_STATUS: {
1238                 u16 status;
1239
1240                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1241                         status = cpu_to_le16(udc->devstatus);
1242                 } else if (crq->bRequestType
1243                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1244                         status = cpu_to_le16(0);
1245                 } else if (crq->bRequestType
1246                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1247                         struct usba_ep *target;
1248
1249                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1250                         if (!target)
1251                                 goto stall;
1252
1253                         status = 0;
1254                         if (is_stalled(udc, target))
1255                                 status |= cpu_to_le16(1);
1256                 } else
1257                         goto delegate;
1258
1259                 /* Write directly to the FIFO. No queueing is done. */
1260                 if (crq->wLength != cpu_to_le16(sizeof(status)))
1261                         goto stall;
1262                 ep->state = DATA_STAGE_IN;
1263                 __raw_writew(status, ep->fifo);
1264                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1265                 break;
1266         }
1267
1268         case USB_REQ_CLEAR_FEATURE: {
1269                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1270                         if (feature_is_dev_remote_wakeup(crq))
1271                                 udc->devstatus
1272                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1273                         else
1274                                 /* Can't CLEAR_FEATURE TEST_MODE */
1275                                 goto stall;
1276                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1277                         struct usba_ep *target;
1278
1279                         if (crq->wLength != cpu_to_le16(0)
1280                                         || !feature_is_ep_halt(crq))
1281                                 goto stall;
1282                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1283                         if (!target)
1284                                 goto stall;
1285
1286                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1287                         if (target->index != 0)
1288                                 usba_ep_writel(target, CLR_STA,
1289                                                 USBA_TOGGLE_CLR);
1290                 } else {
1291                         goto delegate;
1292                 }
1293
1294                 send_status(udc, ep);
1295                 break;
1296         }
1297
1298         case USB_REQ_SET_FEATURE: {
1299                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1300                         if (feature_is_dev_test_mode(crq)) {
1301                                 send_status(udc, ep);
1302                                 ep->state = STATUS_STAGE_TEST;
1303                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1304                                 return 0;
1305                         } else if (feature_is_dev_remote_wakeup(crq)) {
1306                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1307                         } else {
1308                                 goto stall;
1309                         }
1310                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1311                         struct usba_ep *target;
1312
1313                         if (crq->wLength != cpu_to_le16(0)
1314                                         || !feature_is_ep_halt(crq))
1315                                 goto stall;
1316
1317                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1318                         if (!target)
1319                                 goto stall;
1320
1321                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1322                 } else
1323                         goto delegate;
1324
1325                 send_status(udc, ep);
1326                 break;
1327         }
1328
1329         case USB_REQ_SET_ADDRESS:
1330                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1331                         goto delegate;
1332
1333                 set_address(udc, le16_to_cpu(crq->wValue));
1334                 send_status(udc, ep);
1335                 ep->state = STATUS_STAGE_ADDR;
1336                 break;
1337
1338         default:
1339 delegate:
1340                 spin_unlock(&udc->lock);
1341                 retval = udc->driver->setup(&udc->gadget, crq);
1342                 spin_lock(&udc->lock);
1343         }
1344
1345         return retval;
1346
1347 stall:
1348         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1349                 "halting endpoint...\n",
1350                 ep->ep.name, crq->bRequestType, crq->bRequest,
1351                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1352                 le16_to_cpu(crq->wLength));
1353         set_protocol_stall(udc, ep);
1354         return -1;
1355 }
1356
1357 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1358 {
1359         struct usba_request *req;
1360         u32 epstatus;
1361         u32 epctrl;
1362
1363 restart:
1364         epstatus = usba_ep_readl(ep, STA);
1365         epctrl = usba_ep_readl(ep, CTL);
1366
1367         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1368                         ep->ep.name, ep->state, epstatus, epctrl);
1369
1370         req = NULL;
1371         if (!list_empty(&ep->queue))
1372                 req = list_entry(ep->queue.next,
1373                                  struct usba_request, queue);
1374
1375         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1376                 if (req->submitted)
1377                         next_fifo_transaction(ep, req);
1378                 else
1379                         submit_request(ep, req);
1380
1381                 if (req->last_transaction) {
1382                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1383                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1384                 }
1385                 goto restart;
1386         }
1387         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1388                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1389
1390                 switch (ep->state) {
1391                 case DATA_STAGE_IN:
1392                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1393                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1394                         ep->state = STATUS_STAGE_OUT;
1395                         break;
1396                 case STATUS_STAGE_ADDR:
1397                         /* Activate our new address */
1398                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1399                                                 | USBA_FADDR_EN));
1400                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1401                         ep->state = WAIT_FOR_SETUP;
1402                         break;
1403                 case STATUS_STAGE_IN:
1404                         if (req) {
1405                                 list_del_init(&req->queue);
1406                                 request_complete(ep, req, 0);
1407                                 submit_next_request(ep);
1408                         }
1409                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1410                         ep->state = WAIT_FOR_SETUP;
1411                         break;
1412                 case STATUS_STAGE_TEST:
1413                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1414                         ep->state = WAIT_FOR_SETUP;
1415                         if (do_test_mode(udc))
1416                                 set_protocol_stall(udc, ep);
1417                         break;
1418                 default:
1419                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1420                                 "halting endpoint...\n",
1421                                 ep->ep.name, ep->state);
1422                         set_protocol_stall(udc, ep);
1423                         break;
1424                 }
1425
1426                 goto restart;
1427         }
1428         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1429                 switch (ep->state) {
1430                 case STATUS_STAGE_OUT:
1431                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1432                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1433
1434                         if (req) {
1435                                 list_del_init(&req->queue);
1436                                 request_complete(ep, req, 0);
1437                         }
1438                         ep->state = WAIT_FOR_SETUP;
1439                         break;
1440
1441                 case DATA_STAGE_OUT:
1442                         receive_data(ep);
1443                         break;
1444
1445                 default:
1446                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1447                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1448                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1449                                 "halting endpoint...\n",
1450                                 ep->ep.name, ep->state);
1451                         set_protocol_stall(udc, ep);
1452                         break;
1453                 }
1454
1455                 goto restart;
1456         }
1457         if (epstatus & USBA_RX_SETUP) {
1458                 union {
1459                         struct usb_ctrlrequest crq;
1460                         unsigned long data[2];
1461                 } crq;
1462                 unsigned int pkt_len;
1463                 int ret;
1464
1465                 if (ep->state != WAIT_FOR_SETUP) {
1466                         /*
1467                          * Didn't expect a SETUP packet at this
1468                          * point. Clean up any pending requests (which
1469                          * may be successful).
1470                          */
1471                         int status = -EPROTO;
1472
1473                         /*
1474                          * RXRDY and TXCOMP are dropped when SETUP
1475                          * packets arrive.  Just pretend we received
1476                          * the status packet.
1477                          */
1478                         if (ep->state == STATUS_STAGE_OUT
1479                                         || ep->state == STATUS_STAGE_IN) {
1480                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1481                                 status = 0;
1482                         }
1483
1484                         if (req) {
1485                                 list_del_init(&req->queue);
1486                                 request_complete(ep, req, status);
1487                         }
1488                 }
1489
1490                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1491                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1492                 if (pkt_len != sizeof(crq)) {
1493                         pr_warning("udc: Invalid packet length %u "
1494                                 "(expected %zu)\n", pkt_len, sizeof(crq));
1495                         set_protocol_stall(udc, ep);
1496                         return;
1497                 }
1498
1499                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1500                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1501
1502                 /* Free up one bank in the FIFO so that we can
1503                  * generate or receive a reply right away. */
1504                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1505
1506                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1507                         ep->state, crq.crq.bRequestType,
1508                         crq.crq.bRequest); */
1509
1510                 if (crq.crq.bRequestType & USB_DIR_IN) {
1511                         /*
1512                          * The USB 2.0 spec states that "if wLength is
1513                          * zero, there is no data transfer phase."
1514                          * However, testusb #14 seems to actually
1515                          * expect a data phase even if wLength = 0...
1516                          */
1517                         ep->state = DATA_STAGE_IN;
1518                 } else {
1519                         if (crq.crq.wLength != cpu_to_le16(0))
1520                                 ep->state = DATA_STAGE_OUT;
1521                         else
1522                                 ep->state = STATUS_STAGE_IN;
1523                 }
1524
1525                 ret = -1;
1526                 if (ep->index == 0)
1527                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1528                 else {
1529                         spin_unlock(&udc->lock);
1530                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1531                         spin_lock(&udc->lock);
1532                 }
1533
1534                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1535                         crq.crq.bRequestType, crq.crq.bRequest,
1536                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1537
1538                 if (ret < 0) {
1539                         /* Let the host know that we failed */
1540                         set_protocol_stall(udc, ep);
1541                 }
1542         }
1543 }
1544
1545 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1546 {
1547         struct usba_request *req;
1548         u32 epstatus;
1549         u32 epctrl;
1550
1551         epstatus = usba_ep_readl(ep, STA);
1552         epctrl = usba_ep_readl(ep, CTL);
1553
1554         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1555
1556         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1557                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1558
1559                 if (list_empty(&ep->queue)) {
1560                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1561                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1562                         return;
1563                 }
1564
1565                 req = list_entry(ep->queue.next, struct usba_request, queue);
1566
1567                 if (req->using_dma) {
1568                         /* Send a zero-length packet */
1569                         usba_ep_writel(ep, SET_STA,
1570                                         USBA_TX_PK_RDY);
1571                         usba_ep_writel(ep, CTL_DIS,
1572                                         USBA_TX_PK_RDY);
1573                         list_del_init(&req->queue);
1574                         submit_next_request(ep);
1575                         request_complete(ep, req, 0);
1576                 } else {
1577                         if (req->submitted)
1578                                 next_fifo_transaction(ep, req);
1579                         else
1580                                 submit_request(ep, req);
1581
1582                         if (req->last_transaction) {
1583                                 list_del_init(&req->queue);
1584                                 submit_next_request(ep);
1585                                 request_complete(ep, req, 0);
1586                         }
1587                 }
1588
1589                 epstatus = usba_ep_readl(ep, STA);
1590                 epctrl = usba_ep_readl(ep, CTL);
1591         }
1592         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1593                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1594                 receive_data(ep);
1595                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1596         }
1597 }
1598
1599 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1600 {
1601         struct usba_request *req;
1602         u32 status, control, pending;
1603
1604         status = usba_dma_readl(ep, STATUS);
1605         control = usba_dma_readl(ep, CONTROL);
1606 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1607         ep->last_dma_status = status;
1608 #endif
1609         pending = status & control;
1610         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1611
1612         if (status & USBA_DMA_CH_EN) {
1613                 dev_err(&udc->pdev->dev,
1614                         "DMA_CH_EN is set after transfer is finished!\n");
1615                 dev_err(&udc->pdev->dev,
1616                         "status=%#08x, pending=%#08x, control=%#08x\n",
1617                         status, pending, control);
1618
1619                 /*
1620                  * try to pretend nothing happened. We might have to
1621                  * do something here...
1622                  */
1623         }
1624
1625         if (list_empty(&ep->queue))
1626                 /* Might happen if a reset comes along at the right moment */
1627                 return;
1628
1629         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1630                 req = list_entry(ep->queue.next, struct usba_request, queue);
1631                 usba_update_req(ep, req, status);
1632
1633                 list_del_init(&req->queue);
1634                 submit_next_request(ep);
1635                 request_complete(ep, req, 0);
1636         }
1637 }
1638
1639 static irqreturn_t usba_udc_irq(int irq, void *devid)
1640 {
1641         struct usba_udc *udc = devid;
1642         u32 status;
1643         u32 dma_status;
1644         u32 ep_status;
1645
1646         spin_lock(&udc->lock);
1647
1648         status = usba_readl(udc, INT_STA);
1649         DBG(DBG_INT, "irq, status=%#08x\n", status);
1650
1651         if (status & USBA_DET_SUSPEND) {
1652                 toggle_bias(0);
1653                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1654                 DBG(DBG_BUS, "Suspend detected\n");
1655                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1656                                 && udc->driver && udc->driver->suspend) {
1657                         spin_unlock(&udc->lock);
1658                         udc->driver->suspend(&udc->gadget);
1659                         spin_lock(&udc->lock);
1660                 }
1661         }
1662
1663         if (status & USBA_WAKE_UP) {
1664                 toggle_bias(1);
1665                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1666                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1667         }
1668
1669         if (status & USBA_END_OF_RESUME) {
1670                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1671                 DBG(DBG_BUS, "Resume detected\n");
1672                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1673                                 && udc->driver && udc->driver->resume) {
1674                         spin_unlock(&udc->lock);
1675                         udc->driver->resume(&udc->gadget);
1676                         spin_lock(&udc->lock);
1677                 }
1678         }
1679
1680         dma_status = USBA_BFEXT(DMA_INT, status);
1681         if (dma_status) {
1682                 int i;
1683
1684                 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1685                         if (dma_status & (1 << i))
1686                                 usba_dma_irq(udc, &usba_ep[i]);
1687         }
1688
1689         ep_status = USBA_BFEXT(EPT_INT, status);
1690         if (ep_status) {
1691                 int i;
1692
1693                 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1694                         if (ep_status & (1 << i)) {
1695                                 if (ep_is_control(&usba_ep[i]))
1696                                         usba_control_irq(udc, &usba_ep[i]);
1697                                 else
1698                                         usba_ep_irq(udc, &usba_ep[i]);
1699                         }
1700         }
1701
1702         if (status & USBA_END_OF_RESET) {
1703                 struct usba_ep *ep0;
1704
1705                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1706                 reset_all_endpoints(udc);
1707
1708                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1709                                 && udc->driver->disconnect) {
1710                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1711                         spin_unlock(&udc->lock);
1712                         udc->driver->disconnect(&udc->gadget);
1713                         spin_lock(&udc->lock);
1714                 }
1715
1716                 if (status & USBA_HIGH_SPEED)
1717                         udc->gadget.speed = USB_SPEED_HIGH;
1718                 else
1719                         udc->gadget.speed = USB_SPEED_FULL;
1720                 DBG(DBG_BUS, "%s bus reset detected\n",
1721                     usb_speed_string(udc->gadget.speed));
1722
1723                 ep0 = &usba_ep[0];
1724                 ep0->ep.desc = &usba_ep0_desc;
1725                 ep0->state = WAIT_FOR_SETUP;
1726                 usba_ep_writel(ep0, CFG,
1727                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1728                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1729                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1730                 usba_ep_writel(ep0, CTL_ENB,
1731                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1732                 usba_writel(udc, INT_ENB,
1733                                 (usba_readl(udc, INT_ENB)
1734                                 | USBA_BF(EPT_INT, 1)
1735                                 | USBA_DET_SUSPEND
1736                                 | USBA_END_OF_RESUME));
1737
1738                 /*
1739                  * Unclear why we hit this irregularly, e.g. in usbtest,
1740                  * but it's clearly harmless...
1741                  */
1742                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1743                         dev_dbg(&udc->pdev->dev,
1744                                  "ODD: EP0 configuration is invalid!\n");
1745         }
1746
1747         spin_unlock(&udc->lock);
1748
1749         return IRQ_HANDLED;
1750 }
1751
1752 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1753 {
1754         struct usba_udc *udc = devid;
1755         int vbus;
1756
1757         /* debounce */
1758         udelay(10);
1759
1760         spin_lock(&udc->lock);
1761
1762         /* May happen if Vbus pin toggles during probe() */
1763         if (!udc->driver)
1764                 goto out;
1765
1766         vbus = vbus_is_present(udc);
1767         if (vbus != udc->vbus_prev) {
1768                 if (vbus) {
1769                         toggle_bias(1);
1770                         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1771                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1772                 } else {
1773                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1774                         reset_all_endpoints(udc);
1775                         toggle_bias(0);
1776                         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1777                         if (udc->driver->disconnect) {
1778                                 spin_unlock(&udc->lock);
1779                                 udc->driver->disconnect(&udc->gadget);
1780                                 spin_lock(&udc->lock);
1781                         }
1782                 }
1783                 udc->vbus_prev = vbus;
1784         }
1785
1786 out:
1787         spin_unlock(&udc->lock);
1788
1789         return IRQ_HANDLED;
1790 }
1791
1792 static int atmel_usba_start(struct usb_gadget *gadget,
1793                 struct usb_gadget_driver *driver)
1794 {
1795         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1796         unsigned long flags;
1797
1798         spin_lock_irqsave(&udc->lock, flags);
1799
1800         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1801         udc->driver = driver;
1802         udc->gadget.dev.driver = &driver->driver;
1803         spin_unlock_irqrestore(&udc->lock, flags);
1804
1805         clk_enable(udc->pclk);
1806         clk_enable(udc->hclk);
1807
1808         DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1809
1810         udc->vbus_prev = 0;
1811         if (gpio_is_valid(udc->vbus_pin))
1812                 enable_irq(gpio_to_irq(udc->vbus_pin));
1813
1814         /* If Vbus is present, enable the controller and wait for reset */
1815         spin_lock_irqsave(&udc->lock, flags);
1816         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1817                 toggle_bias(1);
1818                 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1819                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1820         }
1821         spin_unlock_irqrestore(&udc->lock, flags);
1822
1823         return 0;
1824 }
1825
1826 static int atmel_usba_stop(struct usb_gadget *gadget,
1827                 struct usb_gadget_driver *driver)
1828 {
1829         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1830         unsigned long flags;
1831
1832         if (gpio_is_valid(udc->vbus_pin))
1833                 disable_irq(gpio_to_irq(udc->vbus_pin));
1834
1835         spin_lock_irqsave(&udc->lock, flags);
1836         udc->gadget.speed = USB_SPEED_UNKNOWN;
1837         reset_all_endpoints(udc);
1838         spin_unlock_irqrestore(&udc->lock, flags);
1839
1840         /* This will also disable the DP pullup */
1841         toggle_bias(0);
1842         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1843
1844         udc->gadget.dev.driver = NULL;
1845         udc->driver = NULL;
1846
1847         clk_disable(udc->hclk);
1848         clk_disable(udc->pclk);
1849
1850         DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1851
1852         return 0;
1853 }
1854
1855 static int __init usba_udc_probe(struct platform_device *pdev)
1856 {
1857         struct usba_platform_data *pdata = pdev->dev.platform_data;
1858         struct resource *regs, *fifo;
1859         struct clk *pclk, *hclk;
1860         struct usba_udc *udc = &the_udc;
1861         int irq, ret, i;
1862
1863         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1864         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1865         if (!regs || !fifo || !pdata)
1866                 return -ENXIO;
1867
1868         irq = platform_get_irq(pdev, 0);
1869         if (irq < 0)
1870                 return irq;
1871
1872         pclk = clk_get(&pdev->dev, "pclk");
1873         if (IS_ERR(pclk))
1874                 return PTR_ERR(pclk);
1875         hclk = clk_get(&pdev->dev, "hclk");
1876         if (IS_ERR(hclk)) {
1877                 ret = PTR_ERR(hclk);
1878                 goto err_get_hclk;
1879         }
1880
1881         spin_lock_init(&udc->lock);
1882         udc->pdev = pdev;
1883         udc->pclk = pclk;
1884         udc->hclk = hclk;
1885         udc->vbus_pin = -ENODEV;
1886
1887         ret = -ENOMEM;
1888         udc->regs = ioremap(regs->start, resource_size(regs));
1889         if (!udc->regs) {
1890                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1891                 goto err_map_regs;
1892         }
1893         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1894                  (unsigned long)regs->start, udc->regs);
1895         udc->fifo = ioremap(fifo->start, resource_size(fifo));
1896         if (!udc->fifo) {
1897                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1898                 goto err_map_fifo;
1899         }
1900         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1901                  (unsigned long)fifo->start, udc->fifo);
1902
1903         device_initialize(&udc->gadget.dev);
1904         udc->gadget.dev.parent = &pdev->dev;
1905         udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1906
1907         platform_set_drvdata(pdev, udc);
1908
1909         /* Make sure we start from a clean slate */
1910         clk_enable(pclk);
1911         toggle_bias(0);
1912         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1913         clk_disable(pclk);
1914
1915         usba_ep = kzalloc(sizeof(struct usba_ep) * pdata->num_ep,
1916                           GFP_KERNEL);
1917         if (!usba_ep)
1918                 goto err_alloc_ep;
1919
1920         the_udc.gadget.ep0 = &usba_ep[0].ep;
1921
1922         INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1923         usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1924         usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1925         usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1926         usba_ep[0].ep.ops = &usba_ep_ops;
1927         usba_ep[0].ep.name = pdata->ep[0].name;
1928         usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
1929         usba_ep[0].udc = &the_udc;
1930         INIT_LIST_HEAD(&usba_ep[0].queue);
1931         usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
1932         usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
1933         usba_ep[0].index = pdata->ep[0].index;
1934         usba_ep[0].can_dma = pdata->ep[0].can_dma;
1935         usba_ep[0].can_isoc = pdata->ep[0].can_isoc;
1936
1937         for (i = 1; i < pdata->num_ep; i++) {
1938                 struct usba_ep *ep = &usba_ep[i];
1939
1940                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1941                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1942                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1943                 ep->ep.ops = &usba_ep_ops;
1944                 ep->ep.name = pdata->ep[i].name;
1945                 ep->ep.maxpacket = pdata->ep[i].fifo_size;
1946                 ep->udc = &the_udc;
1947                 INIT_LIST_HEAD(&ep->queue);
1948                 ep->fifo_size = pdata->ep[i].fifo_size;
1949                 ep->nr_banks = pdata->ep[i].nr_banks;
1950                 ep->index = pdata->ep[i].index;
1951                 ep->can_dma = pdata->ep[i].can_dma;
1952                 ep->can_isoc = pdata->ep[i].can_isoc;
1953
1954                 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1955         }
1956
1957         ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
1958         if (ret) {
1959                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
1960                         irq, ret);
1961                 goto err_request_irq;
1962         }
1963         udc->irq = irq;
1964
1965         ret = device_add(&udc->gadget.dev);
1966         if (ret) {
1967                 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
1968                 goto err_device_add;
1969         }
1970
1971         if (gpio_is_valid(pdata->vbus_pin)) {
1972                 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
1973                         udc->vbus_pin = pdata->vbus_pin;
1974                         udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
1975
1976                         ret = request_irq(gpio_to_irq(udc->vbus_pin),
1977                                         usba_vbus_irq, 0,
1978                                         "atmel_usba_udc", udc);
1979                         if (ret) {
1980                                 gpio_free(udc->vbus_pin);
1981                                 udc->vbus_pin = -ENODEV;
1982                                 dev_warn(&udc->pdev->dev,
1983                                          "failed to request vbus irq; "
1984                                          "assuming always on\n");
1985                         } else {
1986                                 disable_irq(gpio_to_irq(udc->vbus_pin));
1987                         }
1988                 } else {
1989                         /* gpio_request fail so use -EINVAL for gpio_is_valid */
1990                         udc->vbus_pin = -EINVAL;
1991                 }
1992         }
1993
1994         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
1995         if (ret)
1996                 goto err_add_udc;
1997
1998         usba_init_debugfs(udc);
1999         for (i = 1; i < pdata->num_ep; i++)
2000                 usba_ep_init_debugfs(udc, &usba_ep[i]);
2001
2002         return 0;
2003
2004 err_add_udc:
2005         if (gpio_is_valid(pdata->vbus_pin)) {
2006                 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2007                 gpio_free(udc->vbus_pin);
2008         }
2009
2010         device_unregister(&udc->gadget.dev);
2011
2012 err_device_add:
2013         free_irq(irq, udc);
2014 err_request_irq:
2015         kfree(usba_ep);
2016 err_alloc_ep:
2017         iounmap(udc->fifo);
2018 err_map_fifo:
2019         iounmap(udc->regs);
2020 err_map_regs:
2021         clk_put(hclk);
2022 err_get_hclk:
2023         clk_put(pclk);
2024
2025         platform_set_drvdata(pdev, NULL);
2026
2027         return ret;
2028 }
2029
2030 static int __exit usba_udc_remove(struct platform_device *pdev)
2031 {
2032         struct usba_udc *udc;
2033         int i;
2034         struct usba_platform_data *pdata = pdev->dev.platform_data;
2035
2036         udc = platform_get_drvdata(pdev);
2037
2038         usb_del_gadget_udc(&udc->gadget);
2039
2040         for (i = 1; i < pdata->num_ep; i++)
2041                 usba_ep_cleanup_debugfs(&usba_ep[i]);
2042         usba_cleanup_debugfs(udc);
2043
2044         if (gpio_is_valid(udc->vbus_pin)) {
2045                 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2046                 gpio_free(udc->vbus_pin);
2047         }
2048
2049         free_irq(udc->irq, udc);
2050         kfree(usba_ep);
2051         iounmap(udc->fifo);
2052         iounmap(udc->regs);
2053         clk_put(udc->hclk);
2054         clk_put(udc->pclk);
2055
2056         device_unregister(&udc->gadget.dev);
2057
2058         return 0;
2059 }
2060
2061 static struct platform_driver udc_driver = {
2062         .remove         = __exit_p(usba_udc_remove),
2063         .driver         = {
2064                 .name           = "atmel_usba_udc",
2065                 .owner          = THIS_MODULE,
2066         },
2067 };
2068
2069 module_platform_driver_probe(udc_driver, usba_udc_probe);
2070
2071 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2072 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2073 MODULE_LICENSE("GPL");
2074 MODULE_ALIAS("platform:atmel_usba_udc");