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 = kmalloc(sizeof(*req_copy), GFP_ATOMIC);
  52                 if (!req_copy)
  53                         goto fail;
  54                 memcpy(req_copy, req, sizeof(*req_copy));
  55                 list_add_tail(&req_copy->queue, queue_data);
  56         }
  57         spin_unlock_irq(&ep->udc->lock);
  58
  59         file->private_data = queue_data;
  60         return 0;
  61
  62 fail:
  63         spin_unlock_irq(&ep->udc->lock);
  64         list_for_each_entry_safe(req, req_copy, queue_data, queue) {
  65                 list_del(&req->queue);
  66                 kfree(req);
  67         }
  68         kfree(queue_data);
  69         return -ENOMEM;
  70 }
  71
  72 /*
  73  * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
  74  *
  75  * b: buffer address
  76  * l: buffer length
  77  * I/i: interrupt/no interrupt
  78  * Z/z: zero/no zero
  79  * S/s: short ok/short not ok
  80  * s: status
  81  * n: nr_packets
  82  * F/f: submitted/not submitted to FIFO
  83  * D/d: using/not using DMA
  84  * L/l: last transaction/not last transaction
  85  */
  86 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
  87                 size_t nbytes, loff_t *ppos)
  88 {
  89         struct list_head *queue = file->private_data;
  90         struct usba_request *req, *tmp_req;
  91         size_t len, remaining, actual = 0;
  92         char tmpbuf[38];
  93
  94         if (!access_ok(VERIFY_WRITE, buf, nbytes))
  95                 return -EFAULT;
  96
  97         mutex_lock(&file->f_dentry->d_inode->i_mutex);
  98         list_for_each_entry_safe(req, tmp_req, queue, queue) {
  99                 len = snprintf(tmpbuf, sizeof(tmpbuf),
 100                                 "%8p %08x %c%c%c %5d %c%c%c\n",
 101                                 req->req.buf, req->req.length,
 102                                 req->req.no_interrupt ? 'i' : 'I',
 103                                 req->req.zero ? 'Z' : 'z',
 104                                 req->req.short_not_ok ? 's' : 'S',
 105                                 req->req.status,
 106                                 req->submitted ? 'F' : 'f',
 107                                 req->using_dma ? 'D' : 'd',
 108                                 req->last_transaction ? 'L' : 'l');
 109                 len = min(len, sizeof(tmpbuf));
 110                 if (len > nbytes)
 111                         break;
 112
 113                 list_del(&req->queue);
 114                 kfree(req);
 115
 116                 remaining = __copy_to_user(buf, tmpbuf, len);
 117                 actual += len - remaining;
 118                 if (remaining)
 119                         break;
 120
 121                 nbytes -= len;
 122                 buf += len;
 123         }
 124         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 125
 126         return actual;
 127 }
 128
 129 static int queue_dbg_release(struct inode *inode, struct file *file)
 130 {
 131         struct list_head *queue_data = file->private_data;
 132         struct usba_request *req, *tmp_req;
 133
 134         list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
 135                 list_del(&req->queue);
 136                 kfree(req);
 137         }
 138         kfree(queue_data);
 139         return 0;
 140 }
 141
 142 static int regs_dbg_open(struct inode *inode, struct file *file)
 143 {
 144         struct usba_udc *udc;
 145         unsigned int i;
 146         u32 *data;
 147         int ret = -ENOMEM;
 148
 149         mutex_lock(&inode->i_mutex);
 150         udc = inode->i_private;
 151         data = kmalloc(inode->i_size, GFP_KERNEL);
 152         if (!data)
 153                 goto out;
 154
 155         spin_lock_irq(&udc->lock);
 156         for (i = 0; i < inode->i_size / 4; i++)
 157                 data[i] = __raw_readl(udc->regs + i * 4);
 158         spin_unlock_irq(&udc->lock);
 159
 160         file->private_data = data;
 161         ret = 0;
 162
 163 out:
 164         mutex_unlock(&inode->i_mutex);
 165
 166         return ret;
 167 }
 168
 169 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
 170                 size_t nbytes, loff_t *ppos)
 171 {
 172         struct inode *inode = file->f_dentry->d_inode;
 173         int ret;
 174
 175         mutex_lock(&inode->i_mutex);
 176         ret = simple_read_from_buffer(buf, nbytes, ppos,
 177                         file->private_data,
 178                         file->f_dentry->d_inode->i_size);
 179         mutex_unlock(&inode->i_mutex);
 180
 181         return ret;
 182 }
 183
 184 static int regs_dbg_release(struct inode *inode, struct file *file)
 185 {
 186         kfree(file->private_data);
 187         return 0;
 188 }
 189
 190 const struct file_operations queue_dbg_fops = {
 191         .owner          = THIS_MODULE,
 192         .open           = queue_dbg_open,
 193         .llseek         = no_llseek,
 194         .read           = queue_dbg_read,
 195         .release        = queue_dbg_release,
 196 };
 197
 198 const struct file_operations regs_dbg_fops = {
 199         .owner          = THIS_MODULE,
 200         .open           = regs_dbg_open,
 201         .llseek         = generic_file_llseek,
 202         .read           = regs_dbg_read,
 203         .release        = regs_dbg_release,
 204 };
 205
 206 static void usba_ep_init_debugfs(struct usba_udc *udc,
 207                 struct usba_ep *ep)
 208 {
 209         struct dentry *ep_root;
 210
 211         ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
 212         if (!ep_root)
 213                 goto err_root;
 214         ep->debugfs_dir = ep_root;
 215
 216         ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
 217                                                 ep, &queue_dbg_fops);
 218         if (!ep->debugfs_queue)
 219                 goto err_queue;
 220
 221         if (ep->can_dma) {
 222                 ep->debugfs_dma_status
 223                         = debugfs_create_u32("dma_status", 0400, ep_root,
 224                                         &ep->last_dma_status);
 225                 if (!ep->debugfs_dma_status)
 226                         goto err_dma_status;
 227         }
 228         if (ep_is_control(ep)) {
 229                 ep->debugfs_state
 230                         = debugfs_create_u32("state", 0400, ep_root,
 231                                         &ep->state);
 232                 if (!ep->debugfs_state)
 233                         goto err_state;
 234         }
 235
 236         return;
 237
 238 err_state:
 239         if (ep->can_dma)
 240                 debugfs_remove(ep->debugfs_dma_status);
 241 err_dma_status:
 242         debugfs_remove(ep->debugfs_queue);
 243 err_queue:
 244         debugfs_remove(ep_root);
 245 err_root:
 246         dev_err(&ep->udc->pdev->dev,
 247                 "failed to create debugfs directory for %s\n", ep->ep.name);
 248 }
 249
 250 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 251 {
 252         debugfs_remove(ep->debugfs_queue);
 253         debugfs_remove(ep->debugfs_dma_status);
 254         debugfs_remove(ep->debugfs_state);
 255         debugfs_remove(ep->debugfs_dir);
 256         ep->debugfs_dma_status = NULL;
 257         ep->debugfs_dir = NULL;
 258 }
 259
 260 static void usba_init_debugfs(struct usba_udc *udc)
 261 {
 262         struct dentry *root, *regs;
 263         struct resource *regs_resource;
 264
 265         root = debugfs_create_dir(udc->gadget.name, NULL);
 266         if (IS_ERR(root) || !root)
 267                 goto err_root;
 268         udc->debugfs_root = root;
 269
 270         regs = debugfs_create_file("regs", 0400, root, udc, &regs_dbg_fops);
 271         if (!regs)
 272                 goto err_regs;
 273
 274         regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
 275                                 CTRL_IOMEM_ID);
 276         regs->d_inode->i_size = regs_resource->end - regs_resource->start + 1;
 277         udc->debugfs_regs = regs;
 278
 279         usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
 280
 281         return;
 282
 283 err_regs:
 284         debugfs_remove(root);
 285 err_root:
 286         udc->debugfs_root = NULL;
 287         dev_err(&udc->pdev->dev, "debugfs is not available\n");
 288 }
 289
 290 static void usba_cleanup_debugfs(struct usba_udc *udc)
 291 {
 292         usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
 293         debugfs_remove(udc->debugfs_regs);
 294         debugfs_remove(udc->debugfs_root);
 295         udc->debugfs_regs = NULL;
 296         udc->debugfs_root = NULL;
 297 }
 298 #else
 299 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
 300                                          struct usba_ep *ep)
 301 {
 302
 303 }
 304
 305 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 306 {
 307
 308 }
 309
 310 static inline void usba_init_debugfs(struct usba_udc *udc)
 311 {
 312
 313 }
 314
 315 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
 316 {
 317
 318 }
 319 #endif
 320
 321 static int vbus_is_present(struct usba_udc *udc)
 322 {
 323         if (gpio_is_valid(udc->vbus_pin))
 324                 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
 325
 326         /* No Vbus detection: Assume always present */
 327         return 1;
 328 }
 329
 330 #if defined(CONFIG_ARCH_AT91SAM9RL)
 331
 332 #include <mach/at91_pmc.h>
 333
 334 static void toggle_bias(int is_on)
 335 {
 336         unsigned int uckr = at91_sys_read(AT91_CKGR_UCKR);
 337
 338         if (is_on)
 339                 at91_sys_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
 340         else
 341                 at91_sys_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
 342 }
 343
 344 #else
 345
 346 static void toggle_bias(int is_on)
 347 {
 348 }
 349
 350 #endif /* CONFIG_ARCH_AT91SAM9RL */
 351
 352 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 353 {
 354         unsigned int transaction_len;
 355
 356         transaction_len = req->req.length - req->req.actual;
 357         req->last_transaction = 1;
 358         if (transaction_len > ep->ep.maxpacket) {
 359                 transaction_len = ep->ep.maxpacket;
 360                 req->last_transaction = 0;
 361         } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
 362                 req->last_transaction = 0;
 363
 364         DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
 365                 ep->ep.name, req, transaction_len,
 366                 req->last_transaction ? ", done" : "");
 367
 368         memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
 369         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 370         req->req.actual += transaction_len;
 371 }
 372
 373 static void submit_request(struct usba_ep *ep, struct usba_request *req)
 374 {
 375         DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
 376                 ep->ep.name, req, req->req.length);
 377
 378         req->req.actual = 0;
 379         req->submitted = 1;
 380
 381         if (req->using_dma) {
 382                 if (req->req.length == 0) {
 383                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 384                         return;
 385                 }
 386
 387                 if (req->req.zero)
 388                         usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
 389                 else
 390                         usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
 391
 392                 usba_dma_writel(ep, ADDRESS, req->req.dma);
 393                 usba_dma_writel(ep, CONTROL, req->ctrl);
 394         } else {
 395                 next_fifo_transaction(ep, req);
 396                 if (req->last_transaction) {
 397                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
 398                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 399                 } else {
 400                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
 401                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 402                 }
 403         }
 404 }
 405
 406 static void submit_next_request(struct usba_ep *ep)
 407 {
 408         struct usba_request *req;
 409
 410         if (list_empty(&ep->queue)) {
 411                 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
 412                 return;
 413         }
 414
 415         req = list_entry(ep->queue.next, struct usba_request, queue);
 416         if (!req->submitted)
 417                 submit_request(ep, req);
 418 }
 419
 420 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
 421 {
 422         ep->state = STATUS_STAGE_IN;
 423         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 424         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 425 }
 426
 427 static void receive_data(struct usba_ep *ep)
 428 {
 429         struct usba_udc *udc = ep->udc;
 430         struct usba_request *req;
 431         unsigned long status;
 432         unsigned int bytecount, nr_busy;
 433         int is_complete = 0;
 434
 435         status = usba_ep_readl(ep, STA);
 436         nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 437
 438         DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
 439
 440         while (nr_busy > 0) {
 441                 if (list_empty(&ep->queue)) {
 442                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 443                         break;
 444                 }
 445                 req = list_entry(ep->queue.next,
 446                                  struct usba_request, queue);
 447
 448                 bytecount = USBA_BFEXT(BYTE_COUNT, status);
 449
 450                 if (status & (1 << 31))
 451                         is_complete = 1;
 452                 if (req->req.actual + bytecount >= req->req.length) {
 453                         is_complete = 1;
 454                         bytecount = req->req.length - req->req.actual;
 455                 }
 456
 457                 memcpy_fromio(req->req.buf + req->req.actual,
 458                                 ep->fifo, bytecount);
 459                 req->req.actual += bytecount;
 460
 461                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
 462
 463                 if (is_complete) {
 464                         DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
 465                         req->req.status = 0;
 466                         list_del_init(&req->queue);
 467                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 468                         spin_unlock(&udc->lock);
 469                         req->req.complete(&ep->ep, &req->req);
 470                         spin_lock(&udc->lock);
 471                 }
 472
 473                 status = usba_ep_readl(ep, STA);
 474                 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 475
 476                 if (is_complete && ep_is_control(ep)) {
 477                         send_status(udc, ep);
 478                         break;
 479                 }
 480         }
 481 }
 482
 483 static void
 484 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
 485 {
 486         struct usba_udc *udc = ep->udc;
 487
 488         WARN_ON(!list_empty(&req->queue));
 489
 490         if (req->req.status == -EINPROGRESS)
 491                 req->req.status = status;
 492
 493         if (req->mapped) {
 494                 dma_unmap_single(
 495                         &udc->pdev->dev, req->req.dma, req->req.length,
 496                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 497                 req->req.dma = DMA_ADDR_INVALID;
 498                 req->mapped = 0;
 499         }
 500
 501         DBG(DBG_GADGET | DBG_REQ,
 502                 "%s: req %p complete: status %d, actual %u\n",
 503                 ep->ep.name, req, req->req.status, req->req.actual);
 504
 505         spin_unlock(&udc->lock);
 506         req->req.complete(&ep->ep, &req->req);
 507         spin_lock(&udc->lock);
 508 }
 509
 510 static void
 511 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
 512 {
 513         struct usba_request *req, *tmp_req;
 514
 515         list_for_each_entry_safe(req, tmp_req, list, queue) {
 516                 list_del_init(&req->queue);
 517                 request_complete(ep, req, status);
 518         }
 519 }
 520
 521 static int
 522 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 523 {
 524         struct usba_ep *ep = to_usba_ep(_ep);
 525         struct usba_udc *udc = ep->udc;
 526         unsigned long flags, ept_cfg, maxpacket;
 527         unsigned int nr_trans;
 528
 529         DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
 530
 531         maxpacket = le16_to_cpu(desc->wMaxPacketSize) & 0x7ff;
 532
 533         if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
 534                         || ep->index == 0
 535                         || desc->bDescriptorType != USB_DT_ENDPOINT
 536                         || maxpacket == 0
 537                         || maxpacket > ep->fifo_size) {
 538                 DBG(DBG_ERR, "ep_enable: Invalid argument");
 539                 return -EINVAL;
 540         }
 541
 542         ep->is_isoc = 0;
 543         ep->is_in = 0;
 544
 545         if (maxpacket <= 8)
 546                 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
 547         else
 548                 /* LSB is bit 1, not 0 */
 549                 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
 550
 551         DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
 552                         ep->ep.name, ept_cfg, maxpacket);
 553
 554         if (usb_endpoint_dir_in(desc)) {
 555                 ep->is_in = 1;
 556                 ept_cfg |= USBA_EPT_DIR_IN;
 557         }
 558
 559         switch (usb_endpoint_type(desc)) {
 560         case USB_ENDPOINT_XFER_CONTROL:
 561                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 562                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
 563                 break;
 564         case USB_ENDPOINT_XFER_ISOC:
 565                 if (!ep->can_isoc) {
 566                         DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
 567                                         ep->ep.name);
 568                         return -EINVAL;
 569                 }
 570
 571                 /*
 572                  * Bits 11:12 specify number of _additional_
 573                  * transactions per microframe.
 574                  */
 575                 nr_trans = ((le16_to_cpu(desc->wMaxPacketSize) >> 11) & 3) + 1;
 576                 if (nr_trans > 3)
 577                         return -EINVAL;
 578
 579                 ep->is_isoc = 1;
 580                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 581
 582                 /*
 583                  * Do triple-buffering on high-bandwidth iso endpoints.
 584                  */
 585                 if (nr_trans > 1 && ep->nr_banks == 3)
 586                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
 587                 else
 588                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 589                 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 590                 break;
 591         case USB_ENDPOINT_XFER_BULK:
 592                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 593                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 594                 break;
 595         case USB_ENDPOINT_XFER_INT:
 596                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 597                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 598                 break;
 599         }
 600
 601         spin_lock_irqsave(&ep->udc->lock, flags);
 602
 603         if (ep->desc) {
 604                 spin_unlock_irqrestore(&ep->udc->lock, flags);
 605                 DBG(DBG_ERR, "ep%d already enabled\n", ep->index);
 606                 return -EBUSY;
 607         }
 608
 609         ep->desc = desc;
 610         ep->ep.maxpacket = maxpacket;
 611
 612         usba_ep_writel(ep, CFG, ept_cfg);
 613         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 614
 615         if (ep->can_dma) {
 616                 u32 ctrl;
 617
 618                 usba_writel(udc, INT_ENB,
 619                                 (usba_readl(udc, INT_ENB)
 620                                         | USBA_BF(EPT_INT, 1 << ep->index)
 621                                         | USBA_BF(DMA_INT, 1 << ep->index)));
 622                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 623                 usba_ep_writel(ep, CTL_ENB, ctrl);
 624         } else {
 625                 usba_writel(udc, INT_ENB,
 626                                 (usba_readl(udc, INT_ENB)
 627                                         | USBA_BF(EPT_INT, 1 << ep->index)));
 628         }
 629
 630         spin_unlock_irqrestore(&udc->lock, flags);
 631
 632         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 633                         (unsigned long)usba_ep_readl(ep, CFG));
 634         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 635                         (unsigned long)usba_readl(udc, INT_ENB));
 636
 637         return 0;
 638 }
 639
 640 static int usba_ep_disable(struct usb_ep *_ep)
 641 {
 642         struct usba_ep *ep = to_usba_ep(_ep);
 643         struct usba_udc *udc = ep->udc;
 644         LIST_HEAD(req_list);
 645         unsigned long flags;
 646
 647         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 648
 649         spin_lock_irqsave(&udc->lock, flags);
 650
 651         if (!ep->desc) {
 652                 spin_unlock_irqrestore(&udc->lock, flags);
 653                 /* REVISIT because this driver disables endpoints in
 654                  * reset_all_endpoints() before calling disconnect(),
 655                  * most gadget drivers would trigger this non-error ...
 656                  */
 657                 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
 658                         DBG(DBG_ERR, "ep_disable: %s not enabled\n",
 659                                         ep->ep.name);
 660                 return -EINVAL;
 661         }
 662         ep->desc = NULL;
 663
 664         list_splice_init(&ep->queue, &req_list);
 665         if (ep->can_dma) {
 666                 usba_dma_writel(ep, CONTROL, 0);
 667                 usba_dma_writel(ep, ADDRESS, 0);
 668                 usba_dma_readl(ep, STATUS);
 669         }
 670         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 671         usba_writel(udc, INT_ENB,
 672                         usba_readl(udc, INT_ENB)
 673                         & ~USBA_BF(EPT_INT, 1 << ep->index));
 674
 675         request_complete_list(ep, &req_list, -ESHUTDOWN);
 676
 677         spin_unlock_irqrestore(&udc->lock, flags);
 678
 679         return 0;
 680 }
 681
 682 static struct usb_request *
 683 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 684 {
 685         struct usba_request *req;
 686
 687         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 688
 689         req = kzalloc(sizeof(*req), gfp_flags);
 690         if (!req)
 691                 return NULL;
 692
 693         INIT_LIST_HEAD(&req->queue);
 694         req->req.dma = DMA_ADDR_INVALID;
 695
 696         return &req->req;
 697 }
 698
 699 static void
 700 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 701 {
 702         struct usba_request *req = to_usba_req(_req);
 703
 704         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 705
 706         kfree(req);
 707 }
 708
 709 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 710                 struct usba_request *req, gfp_t gfp_flags)
 711 {
 712         unsigned long flags;
 713         int ret;
 714
 715         DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
 716                 ep->ep.name, req->req.length, req->req.dma,
 717                 req->req.zero ? 'Z' : 'z',
 718                 req->req.short_not_ok ? 'S' : 's',
 719                 req->req.no_interrupt ? 'I' : 'i');
 720
 721         if (req->req.length > 0x10000) {
 722                 /* Lengths from 0 to 65536 (inclusive) are supported */
 723                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 724                 return -EINVAL;
 725         }
 726
 727         req->using_dma = 1;
 728
 729         if (req->req.dma == DMA_ADDR_INVALID) {
 730                 req->req.dma = dma_map_single(
 731                         &udc->pdev->dev, req->req.buf, req->req.length,
 732                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 733                 req->mapped = 1;
 734         } else {
 735                 dma_sync_single_for_device(
 736                         &udc->pdev->dev, req->req.dma, req->req.length,
 737                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 738                 req->mapped = 0;
 739         }
 740
 741         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 742                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 743                         | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 744
 745         if (ep->is_in)
 746                 req->ctrl |= USBA_DMA_END_BUF_EN;
 747
 748         /*
 749          * Add this request to the queue and submit for DMA if
 750          * possible. Check if we're still alive first -- we may have
 751          * received a reset since last time we checked.
 752          */
 753         ret = -ESHUTDOWN;
 754         spin_lock_irqsave(&udc->lock, flags);
 755         if (ep->desc) {
 756                 if (list_empty(&ep->queue))
 757                         submit_request(ep, req);
 758
 759                 list_add_tail(&req->queue, &ep->queue);
 760                 ret = 0;
 761         }
 762         spin_unlock_irqrestore(&udc->lock, flags);
 763
 764         return ret;
 765 }
 766
 767 static int
 768 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 769 {
 770         struct usba_request *req = to_usba_req(_req);
 771         struct usba_ep *ep = to_usba_ep(_ep);
 772         struct usba_udc *udc = ep->udc;
 773         unsigned long flags;
 774         int ret;
 775
 776         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 777                         ep->ep.name, req, _req->length);
 778
 779         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN || !ep->desc)
 780                 return -ESHUTDOWN;
 781
 782         req->submitted = 0;
 783         req->using_dma = 0;
 784         req->last_transaction = 0;
 785
 786         _req->status = -EINPROGRESS;
 787         _req->actual = 0;
 788
 789         if (ep->can_dma)
 790                 return queue_dma(udc, ep, req, gfp_flags);
 791
 792         /* May have received a reset since last time we checked */
 793         ret = -ESHUTDOWN;
 794         spin_lock_irqsave(&udc->lock, flags);
 795         if (ep->desc) {
 796                 list_add_tail(&req->queue, &ep->queue);
 797
 798                 if ((!ep_is_control(ep) && ep->is_in) ||
 799                         (ep_is_control(ep)
 800                                 && (ep->state == DATA_STAGE_IN
 801                                         || ep->state == STATUS_STAGE_IN)))
 802                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 803                 else
 804                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 805                 ret = 0;
 806         }
 807         spin_unlock_irqrestore(&udc->lock, flags);
 808
 809         return ret;
 810 }
 811
 812 static void
 813 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 814 {
 815         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 816 }
 817
 818 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 819 {
 820         unsigned int timeout;
 821         u32 status;
 822
 823         /*
 824          * Stop the DMA controller. When writing both CH_EN
 825          * and LINK to 0, the other bits are not affected.
 826          */
 827         usba_dma_writel(ep, CONTROL, 0);
 828
 829         /* Wait for the FIFO to empty */
 830         for (timeout = 40; timeout; --timeout) {
 831                 status = usba_dma_readl(ep, STATUS);
 832                 if (!(status & USBA_DMA_CH_EN))
 833                         break;
 834                 udelay(1);
 835         }
 836
 837         if (pstatus)
 838                 *pstatus = status;
 839
 840         if (timeout == 0) {
 841                 dev_err(&ep->udc->pdev->dev,
 842                         "%s: timed out waiting for DMA FIFO to empty\n",
 843                         ep->ep.name);
 844                 return -ETIMEDOUT;
 845         }
 846
 847         return 0;
 848 }
 849
 850 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 851 {
 852         struct usba_ep *ep = to_usba_ep(_ep);
 853         struct usba_udc *udc = ep->udc;
 854         struct usba_request *req = to_usba_req(_req);
 855         unsigned long flags;
 856         u32 status;
 857
 858         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 859                         ep->ep.name, req);
 860
 861         spin_lock_irqsave(&udc->lock, flags);
 862
 863         if (req->using_dma) {
 864                 /*
 865                  * If this request is currently being transferred,
 866                  * stop the DMA controller and reset the FIFO.
 867                  */
 868                 if (ep->queue.next == &req->queue) {
 869                         status = usba_dma_readl(ep, STATUS);
 870                         if (status & USBA_DMA_CH_EN)
 871                                 stop_dma(ep, &status);
 872
 873 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 874                         ep->last_dma_status = status;
 875 #endif
 876
 877                         usba_writel(udc, EPT_RST, 1 << ep->index);
 878
 879                         usba_update_req(ep, req, status);
 880                 }
 881         }
 882
 883         /*
 884          * Errors should stop the queue from advancing until the
 885          * completion function returns.
 886          */
 887         list_del_init(&req->queue);
 888
 889         request_complete(ep, req, -ECONNRESET);
 890
 891         /* Process the next request if any */
 892         submit_next_request(ep);
 893         spin_unlock_irqrestore(&udc->lock, flags);
 894
 895         return 0;
 896 }
 897
 898 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 899 {
 900         struct usba_ep *ep = to_usba_ep(_ep);
 901         struct usba_udc *udc = ep->udc;
 902         unsigned long flags;
 903         int ret = 0;
 904
 905         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 906                         value ? "set" : "clear");
 907
 908         if (!ep->desc) {
 909                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 910                                 ep->ep.name);
 911                 return -ENODEV;
 912         }
 913         if (ep->is_isoc) {
 914                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 915                                 ep->ep.name);
 916                 return -ENOTTY;
 917         }
 918
 919         spin_lock_irqsave(&udc->lock, flags);
 920
 921         /*
 922          * We can't halt IN endpoints while there are still data to be
 923          * transferred
 924          */
 925         if (!list_empty(&ep->queue)
 926                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 927                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 928                 ret = -EAGAIN;
 929         } else {
 930                 if (value)
 931                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 932                 else
 933                         usba_ep_writel(ep, CLR_STA,
 934                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 935                 usba_ep_readl(ep, STA);
 936         }
 937
 938         spin_unlock_irqrestore(&udc->lock, flags);
 939
 940         return ret;
 941 }
 942
 943 static int usba_ep_fifo_status(struct usb_ep *_ep)
 944 {
 945         struct usba_ep *ep = to_usba_ep(_ep);
 946
 947         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 948 }
 949
 950 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 951 {
 952         struct usba_ep *ep = to_usba_ep(_ep);
 953         struct usba_udc *udc = ep->udc;
 954
 955         usba_writel(udc, EPT_RST, 1 << ep->index);
 956 }
 957
 958 static const struct usb_ep_ops usba_ep_ops = {
 959         .enable         = usba_ep_enable,
 960         .disable        = usba_ep_disable,
 961         .alloc_request  = usba_ep_alloc_request,
 962         .free_request   = usba_ep_free_request,
 963         .queue          = usba_ep_queue,
 964         .dequeue        = usba_ep_dequeue,
 965         .set_halt       = usba_ep_set_halt,
 966         .fifo_status    = usba_ep_fifo_status,
 967         .fifo_flush     = usba_ep_fifo_flush,
 968 };
 969
 970 static int usba_udc_get_frame(struct usb_gadget *gadget)
 971 {
 972         struct usba_udc *udc = to_usba_udc(gadget);
 973
 974         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 975 }
 976
 977 static int usba_udc_wakeup(struct usb_gadget *gadget)
 978 {
 979         struct usba_udc *udc = to_usba_udc(gadget);
 980         unsigned long flags;
 981         u32 ctrl;
 982         int ret = -EINVAL;
 983
 984         spin_lock_irqsave(&udc->lock, flags);
 985         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 986                 ctrl = usba_readl(udc, CTRL);
 987                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 988                 ret = 0;
 989         }
 990         spin_unlock_irqrestore(&udc->lock, flags);
 991
 992         return ret;
 993 }
 994
 995 static int
 996 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 997 {
 998         struct usba_udc *udc = to_usba_udc(gadget);
 999         unsigned long flags;
1000
1001         spin_lock_irqsave(&udc->lock, flags);
1002         if (is_selfpowered)
1003                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1004         else
1005                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1006         spin_unlock_irqrestore(&udc->lock, flags);
1007
1008         return 0;
1009 }
1010
1011 static const struct usb_gadget_ops usba_udc_ops = {
1012         .get_frame              = usba_udc_get_frame,
1013         .wakeup                 = usba_udc_wakeup,
1014         .set_selfpowered        = usba_udc_set_selfpowered,
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                 .is_dualspeed   = 1,
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->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->desc)
1087                         continue;
1088                 bEndpointAddress = 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                         DBG(DBG_BUS, "High-speed bus reset detected\n");
1718                         udc->gadget.speed = USB_SPEED_HIGH;
1719                 } else {
1720                         DBG(DBG_BUS, "Full-speed bus reset detected\n");
1721                         udc->gadget.speed = USB_SPEED_FULL;
1722                 }
1723
1724                 ep0 = &usba_ep[0];
1725                 ep0->desc = &usba_ep0_desc;
1726                 ep0->state = WAIT_FOR_SETUP;
1727                 usba_ep_writel(ep0, CFG,
1728                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1729                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1730                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1731                 usba_ep_writel(ep0, CTL_ENB,
1732                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1733                 usba_writel(udc, INT_ENB,
1734                                 (usba_readl(udc, INT_ENB)
1735                                 | USBA_BF(EPT_INT, 1)
1736                                 | USBA_DET_SUSPEND
1737                                 | USBA_END_OF_RESUME));
1738
1739                 /*
1740                  * Unclear why we hit this irregularly, e.g. in usbtest,
1741                  * but it's clearly harmless...
1742                  */
1743                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1744                         dev_dbg(&udc->pdev->dev,
1745                                  "ODD: EP0 configuration is invalid!\n");
1746         }
1747
1748         spin_unlock(&udc->lock);
1749
1750         return IRQ_HANDLED;
1751 }
1752
1753 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1754 {
1755         struct usba_udc *udc = devid;
1756         int vbus;
1757
1758         /* debounce */
1759         udelay(10);
1760
1761         spin_lock(&udc->lock);
1762
1763         /* May happen if Vbus pin toggles during probe() */
1764         if (!udc->driver)
1765                 goto out;
1766
1767         vbus = vbus_is_present(udc);
1768         if (vbus != udc->vbus_prev) {
1769                 if (vbus) {
1770                         toggle_bias(1);
1771                         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1772                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1773                 } else {
1774                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1775                         reset_all_endpoints(udc);
1776                         toggle_bias(0);
1777                         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1778                         if (udc->driver->disconnect) {
1779                                 spin_unlock(&udc->lock);
1780                                 udc->driver->disconnect(&udc->gadget);
1781                                 spin_lock(&udc->lock);
1782                         }
1783                 }
1784                 udc->vbus_prev = vbus;
1785         }
1786
1787 out:
1788         spin_unlock(&udc->lock);
1789
1790         return IRQ_HANDLED;
1791 }
1792
1793 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1794 {
1795         struct usba_udc *udc = &the_udc;
1796         unsigned long flags;
1797         int ret;
1798
1799         if (!udc->pdev)
1800                 return -ENODEV;
1801
1802         spin_lock_irqsave(&udc->lock, flags);
1803         if (udc->driver) {
1804                 spin_unlock_irqrestore(&udc->lock, flags);
1805                 return -EBUSY;
1806         }
1807
1808         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1809         udc->driver = driver;
1810         udc->gadget.dev.driver = &driver->driver;
1811         spin_unlock_irqrestore(&udc->lock, flags);
1812
1813         clk_enable(udc->pclk);
1814         clk_enable(udc->hclk);
1815
1816         ret = driver->bind(&udc->gadget);
1817         if (ret) {
1818                 DBG(DBG_ERR, "Could not bind to driver %s: error %d\n",
1819                         driver->driver.name, ret);
1820                 goto err_driver_bind;
1821         }
1822
1823         DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1824
1825         udc->vbus_prev = 0;
1826         if (gpio_is_valid(udc->vbus_pin))
1827                 enable_irq(gpio_to_irq(udc->vbus_pin));
1828
1829         /* If Vbus is present, enable the controller and wait for reset */
1830         spin_lock_irqsave(&udc->lock, flags);
1831         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1832                 toggle_bias(1);
1833                 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1834                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1835         }
1836         spin_unlock_irqrestore(&udc->lock, flags);
1837
1838         return 0;
1839
1840 err_driver_bind:
1841         udc->driver = NULL;
1842         udc->gadget.dev.driver = NULL;
1843         return ret;
1844 }
1845 EXPORT_SYMBOL(usb_gadget_register_driver);
1846
1847 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1848 {
1849         struct usba_udc *udc = &the_udc;
1850         unsigned long flags;
1851
1852         if (!udc->pdev)
1853                 return -ENODEV;
1854         if (driver != udc->driver || !driver->unbind)
1855                 return -EINVAL;
1856
1857         if (gpio_is_valid(udc->vbus_pin))
1858                 disable_irq(gpio_to_irq(udc->vbus_pin));
1859
1860         spin_lock_irqsave(&udc->lock, flags);
1861         udc->gadget.speed = USB_SPEED_UNKNOWN;
1862         reset_all_endpoints(udc);
1863         spin_unlock_irqrestore(&udc->lock, flags);
1864
1865         /* This will also disable the DP pullup */
1866         toggle_bias(0);
1867         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1868
1869         if (udc->driver->disconnect)
1870                 udc->driver->disconnect(&udc->gadget);
1871
1872         driver->unbind(&udc->gadget);
1873         udc->gadget.dev.driver = NULL;
1874         udc->driver = NULL;
1875
1876         clk_disable(udc->hclk);
1877         clk_disable(udc->pclk);
1878
1879         DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1880
1881         return 0;
1882 }
1883 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1884
1885 static int __init usba_udc_probe(struct platform_device *pdev)
1886 {
1887         struct usba_platform_data *pdata = pdev->dev.platform_data;
1888         struct resource *regs, *fifo;
1889         struct clk *pclk, *hclk;
1890         struct usba_udc *udc = &the_udc;
1891         int irq, ret, i;
1892
1893         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1894         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1895         if (!regs || !fifo || !pdata)
1896                 return -ENXIO;
1897
1898         irq = platform_get_irq(pdev, 0);
1899         if (irq < 0)
1900                 return irq;
1901
1902         pclk = clk_get(&pdev->dev, "pclk");
1903         if (IS_ERR(pclk))
1904                 return PTR_ERR(pclk);
1905         hclk = clk_get(&pdev->dev, "hclk");
1906         if (IS_ERR(hclk)) {
1907                 ret = PTR_ERR(hclk);
1908                 goto err_get_hclk;
1909         }
1910
1911         spin_lock_init(&udc->lock);
1912         udc->pdev = pdev;
1913         udc->pclk = pclk;
1914         udc->hclk = hclk;
1915         udc->vbus_pin = -ENODEV;
1916
1917         ret = -ENOMEM;
1918         udc->regs = ioremap(regs->start, resource_size(regs));
1919         if (!udc->regs) {
1920                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1921                 goto err_map_regs;
1922         }
1923         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1924                  (unsigned long)regs->start, udc->regs);
1925         udc->fifo = ioremap(fifo->start, resource_size(fifo));
1926         if (!udc->fifo) {
1927                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1928                 goto err_map_fifo;
1929         }
1930         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1931                  (unsigned long)fifo->start, udc->fifo);
1932
1933         device_initialize(&udc->gadget.dev);
1934         udc->gadget.dev.parent = &pdev->dev;
1935         udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1936
1937         platform_set_drvdata(pdev, udc);
1938
1939         /* Make sure we start from a clean slate */
1940         clk_enable(pclk);
1941         toggle_bias(0);
1942         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1943         clk_disable(pclk);
1944
1945         usba_ep = kzalloc(sizeof(struct usba_ep) * pdata->num_ep,
1946                           GFP_KERNEL);
1947         if (!usba_ep)
1948                 goto err_alloc_ep;
1949
1950         the_udc.gadget.ep0 = &usba_ep[0].ep;
1951
1952         INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1953         usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1954         usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1955         usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1956         usba_ep[0].ep.ops = &usba_ep_ops;
1957         usba_ep[0].ep.name = pdata->ep[0].name;
1958         usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
1959         usba_ep[0].udc = &the_udc;
1960         INIT_LIST_HEAD(&usba_ep[0].queue);
1961         usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
1962         usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
1963         usba_ep[0].index = pdata->ep[0].index;
1964         usba_ep[0].can_dma = pdata->ep[0].can_dma;
1965         usba_ep[0].can_isoc = pdata->ep[0].can_isoc;
1966
1967         for (i = 1; i < pdata->num_ep; i++) {
1968                 struct usba_ep *ep = &usba_ep[i];
1969
1970                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1971                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1972                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1973                 ep->ep.ops = &usba_ep_ops;
1974                 ep->ep.name = pdata->ep[i].name;
1975                 ep->ep.maxpacket = pdata->ep[i].fifo_size;
1976                 ep->udc = &the_udc;
1977                 INIT_LIST_HEAD(&ep->queue);
1978                 ep->fifo_size = pdata->ep[i].fifo_size;
1979                 ep->nr_banks = pdata->ep[i].nr_banks;
1980                 ep->index = pdata->ep[i].index;
1981                 ep->can_dma = pdata->ep[i].can_dma;
1982                 ep->can_isoc = pdata->ep[i].can_isoc;
1983
1984                 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1985         }
1986
1987         ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
1988         if (ret) {
1989                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
1990                         irq, ret);
1991                 goto err_request_irq;
1992         }
1993         udc->irq = irq;
1994
1995         ret = device_add(&udc->gadget.dev);
1996         if (ret) {
1997                 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
1998                 goto err_device_add;
1999         }
2000
2001         if (gpio_is_valid(pdata->vbus_pin)) {
2002                 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
2003                         udc->vbus_pin = pdata->vbus_pin;
2004                         udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
2005
2006                         ret = request_irq(gpio_to_irq(udc->vbus_pin),
2007                                         usba_vbus_irq, 0,
2008                                         "atmel_usba_udc", udc);
2009                         if (ret) {
2010                                 gpio_free(udc->vbus_pin);
2011                                 udc->vbus_pin = -ENODEV;
2012                                 dev_warn(&udc->pdev->dev,
2013                                          "failed to request vbus irq; "
2014                                          "assuming always on\n");
2015                         } else {
2016                                 disable_irq(gpio_to_irq(udc->vbus_pin));
2017                         }
2018                 }
2019         }
2020
2021         usba_init_debugfs(udc);
2022         for (i = 1; i < pdata->num_ep; i++)
2023                 usba_ep_init_debugfs(udc, &usba_ep[i]);
2024
2025         return 0;
2026
2027 err_device_add:
2028         free_irq(irq, udc);
2029 err_request_irq:
2030         kfree(usba_ep);
2031 err_alloc_ep:
2032         iounmap(udc->fifo);
2033 err_map_fifo:
2034         iounmap(udc->regs);
2035 err_map_regs:
2036         clk_put(hclk);
2037 err_get_hclk:
2038         clk_put(pclk);
2039
2040         platform_set_drvdata(pdev, NULL);
2041
2042         return ret;
2043 }
2044
2045 static int __exit usba_udc_remove(struct platform_device *pdev)
2046 {
2047         struct usba_udc *udc;
2048         int i;
2049         struct usba_platform_data *pdata = pdev->dev.platform_data;
2050
2051         udc = platform_get_drvdata(pdev);
2052
2053         for (i = 1; i < pdata->num_ep; i++)
2054                 usba_ep_cleanup_debugfs(&usba_ep[i]);
2055         usba_cleanup_debugfs(udc);
2056
2057         if (gpio_is_valid(udc->vbus_pin))
2058                 gpio_free(udc->vbus_pin);
2059
2060         free_irq(udc->irq, udc);
2061         kfree(usba_ep);
2062         iounmap(udc->fifo);
2063         iounmap(udc->regs);
2064         clk_put(udc->hclk);
2065         clk_put(udc->pclk);
2066
2067         device_unregister(&udc->gadget.dev);
2068
2069         return 0;
2070 }
2071
2072 static struct platform_driver udc_driver = {
2073         .remove         = __exit_p(usba_udc_remove),
2074         .driver         = {
2075                 .name           = "atmel_usba_udc",
2076                 .owner          = THIS_MODULE,
2077         },
2078 };
2079
2080 static int __init udc_init(void)
2081 {
2082         return platform_driver_probe(&udc_driver, usba_udc_probe);
2083 }
2084 module_init(udc_init);
2085
2086 static void __exit udc_exit(void)
2087 {
2088         platform_driver_unregister(&udc_driver);
2089 }
2090 module_exit(udc_exit);
2091
2092 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2093 MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
2094 MODULE_LICENSE("GPL");
2095 MODULE_ALIAS("platform:atmel_usba_udc");