drivers/usb/gadget/atmel_usba_udc.c

   1 /*
   2  * Driver for the Atmel USBA high speed USB device controller
   3  *
   4  * Copyright (C) 2005-2007 Atmel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/clk.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/io.h>
  15 #include <linux/slab.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/list.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/usb/ch9.h>
  21 #include <linux/usb/gadget.h>
  22 #include <linux/usb/atmel_usba_udc.h>
  23 #include <linux/delay.h>
  24
  25 #include <asm/gpio.h>
  26 #include <mach/board.h>
  27
  28 #include "atmel_usba_udc.h"
  29
  30
  31 static struct usba_udc the_udc;
  32 static struct usba_ep *usba_ep;
  33
  34 #ifdef CONFIG_USB_GADGET_DEBUG_FS
  35 #include <linux/debugfs.h>
  36 #include <linux/uaccess.h>
  37
  38 static int queue_dbg_open(struct inode *inode, struct file *file)
  39 {
  40         struct usba_ep *ep = inode->i_private;
  41         struct usba_request *req, *req_copy;
  42         struct list_head *queue_data;
  43
  44         queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
  45         if (!queue_data)
  46                 return -ENOMEM;
  47         INIT_LIST_HEAD(queue_data);
  48
  49         spin_lock_irq(&ep->udc->lock);
  50         list_for_each_entry(req, &ep->queue, queue) {
  51                 req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
  52                 if (!req_copy)
  53                         goto fail;
  54                 list_add_tail(&req_copy->queue, queue_data);
  55         }
  56         spin_unlock_irq(&ep->udc->lock);
  57
  58         file->private_data = queue_data;
  59         return 0;
  60
  61 fail:
  62         spin_unlock_irq(&ep->udc->lock);
  63         list_for_each_entry_safe(req, req_copy, queue_data, queue) {
  64                 list_del(&req->queue);
  65                 kfree(req);
  66         }
  67         kfree(queue_data);
  68         return -ENOMEM;
  69 }
  70
  71 /*
  72  * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
  73  *
  74  * b: buffer address
  75  * l: buffer length
  76  * I/i: interrupt/no interrupt
  77  * Z/z: zero/no zero
  78  * S/s: short ok/short not ok
  79  * s: status
  80  * n: nr_packets
  81  * F/f: submitted/not submitted to FIFO
  82  * D/d: using/not using DMA
  83  * L/l: last transaction/not last transaction
  84  */
  85 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
  86                 size_t nbytes, loff_t *ppos)
  87 {
  88         struct list_head *queue = file->private_data;
  89         struct usba_request *req, *tmp_req;
  90         size_t len, remaining, actual = 0;
  91         char tmpbuf[38];
  92
  93         if (!access_ok(VERIFY_WRITE, buf, nbytes))
  94                 return -EFAULT;
  95
  96         mutex_lock(&file->f_dentry->d_inode->i_mutex);
  97         list_for_each_entry_safe(req, tmp_req, queue, queue) {
  98                 len = snprintf(tmpbuf, sizeof(tmpbuf),
  99                                 "%8p %08x %c%c%c %5d %c%c%c\n",
 100                                 req->req.buf, req->req.length,
 101                                 req->req.no_interrupt ? 'i' : 'I',
 102                                 req->req.zero ? 'Z' : 'z',
 103                                 req->req.short_not_ok ? 's' : 'S',
 104                                 req->req.status,
 105                                 req->submitted ? 'F' : 'f',
 106                                 req->using_dma ? 'D' : 'd',
 107                                 req->last_transaction ? 'L' : 'l');
 108                 len = min(len, sizeof(tmpbuf));
 109                 if (len > nbytes)
 110                         break;
 111
 112                 list_del(&req->queue);
 113                 kfree(req);
 114
 115                 remaining = __copy_to_user(buf, tmpbuf, len);
 116                 actual += len - remaining;
 117                 if (remaining)
 118                         break;
 119
 120                 nbytes -= len;
 121                 buf += len;
 122         }
 123         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 124
 125         return actual;
 126 }
 127
 128 static int queue_dbg_release(struct inode *inode, struct file *file)
 129 {
 130         struct list_head *queue_data = file->private_data;
 131         struct usba_request *req, *tmp_req;
 132
 133         list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
 134                 list_del(&req->queue);
 135                 kfree(req);
 136         }
 137         kfree(queue_data);
 138         return 0;
 139 }
 140
 141 static int regs_dbg_open(struct inode *inode, struct file *file)
 142 {
 143         struct usba_udc *udc;
 144         unsigned int i;
 145         u32 *data;
 146         int ret = -ENOMEM;
 147
 148         mutex_lock(&inode->i_mutex);
 149         udc = inode->i_private;
 150         data = kmalloc(inode->i_size, GFP_KERNEL);
 151         if (!data)
 152                 goto out;
 153
 154         spin_lock_irq(&udc->lock);
 155         for (i = 0; i < inode->i_size / 4; i++)
 156                 data[i] = __raw_readl(udc->regs + i * 4);
 157         spin_unlock_irq(&udc->lock);
 158
 159         file->private_data = data;
 160         ret = 0;
 161
 162 out:
 163         mutex_unlock(&inode->i_mutex);
 164
 165         return ret;
 166 }
 167
 168 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
 169                 size_t nbytes, loff_t *ppos)
 170 {
 171         struct inode *inode = file->f_dentry->d_inode;
 172         int ret;
 173
 174         mutex_lock(&inode->i_mutex);
 175         ret = simple_read_from_buffer(buf, nbytes, ppos,
 176                         file->private_data,
 177                         file->f_dentry->d_inode->i_size);
 178         mutex_unlock(&inode->i_mutex);
 179
 180         return ret;
 181 }
 182
 183 static int regs_dbg_release(struct inode *inode, struct file *file)
 184 {
 185         kfree(file->private_data);
 186         return 0;
 187 }
 188
 189 const struct file_operations queue_dbg_fops = {
 190         .owner          = THIS_MODULE,
 191         .open           = queue_dbg_open,
 192         .llseek         = no_llseek,
 193         .read           = queue_dbg_read,
 194         .release        = queue_dbg_release,
 195 };
 196
 197 const struct file_operations regs_dbg_fops = {
 198         .owner          = THIS_MODULE,
 199         .open           = regs_dbg_open,
 200         .llseek         = generic_file_llseek,
 201         .read           = regs_dbg_read,
 202         .release        = regs_dbg_release,
 203 };
 204
 205 static void usba_ep_init_debugfs(struct usba_udc *udc,
 206                 struct usba_ep *ep)
 207 {
 208         struct dentry *ep_root;
 209
 210         ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
 211         if (!ep_root)
 212                 goto err_root;
 213         ep->debugfs_dir = ep_root;
 214
 215         ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
 216                                                 ep, &queue_dbg_fops);
 217         if (!ep->debugfs_queue)
 218                 goto err_queue;
 219
 220         if (ep->can_dma) {
 221                 ep->debugfs_dma_status
 222                         = debugfs_create_u32("dma_status", 0400, ep_root,
 223                                         &ep->last_dma_status);
 224                 if (!ep->debugfs_dma_status)
 225                         goto err_dma_status;
 226         }
 227         if (ep_is_control(ep)) {
 228                 ep->debugfs_state
 229                         = debugfs_create_u32("state", 0400, ep_root,
 230                                         &ep->state);
 231                 if (!ep->debugfs_state)
 232                         goto err_state;
 233         }
 234
 235         return;
 236
 237 err_state:
 238         if (ep->can_dma)
 239                 debugfs_remove(ep->debugfs_dma_status);
 240 err_dma_status:
 241         debugfs_remove(ep->debugfs_queue);
 242 err_queue:
 243         debugfs_remove(ep_root);
 244 err_root:
 245         dev_err(&ep->udc->pdev->dev,
 246                 "failed to create debugfs directory for %s\n", ep->ep.name);
 247 }
 248
 249 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 250 {
 251         debugfs_remove(ep->debugfs_queue);
 252         debugfs_remove(ep->debugfs_dma_status);
 253         debugfs_remove(ep->debugfs_state);
 254         debugfs_remove(ep->debugfs_dir);
 255         ep->debugfs_dma_status = NULL;
 256         ep->debugfs_dir = NULL;
 257 }
 258
 259 static void usba_init_debugfs(struct usba_udc *udc)
 260 {
 261         struct dentry *root, *regs;
 262         struct resource *regs_resource;
 263
 264         root = debugfs_create_dir(udc->gadget.name, NULL);
 265         if (IS_ERR(root) || !root)
 266                 goto err_root;
 267         udc->debugfs_root = root;
 268
 269         regs = debugfs_create_file("regs", 0400, root, udc, &regs_dbg_fops);
 270         if (!regs)
 271                 goto err_regs;
 272
 273         regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
 274                                 CTRL_IOMEM_ID);
 275         regs->d_inode->i_size = resource_size(regs_resource);
 276         udc->debugfs_regs = regs;
 277
 278         usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
 279
 280         return;
 281
 282 err_regs:
 283         debugfs_remove(root);
 284 err_root:
 285         udc->debugfs_root = NULL;
 286         dev_err(&udc->pdev->dev, "debugfs is not available\n");
 287 }
 288
 289 static void usba_cleanup_debugfs(struct usba_udc *udc)
 290 {
 291         usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
 292         debugfs_remove(udc->debugfs_regs);
 293         debugfs_remove(udc->debugfs_root);
 294         udc->debugfs_regs = NULL;
 295         udc->debugfs_root = NULL;
 296 }
 297 #else
 298 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
 299                                          struct usba_ep *ep)
 300 {
 301
 302 }
 303
 304 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 305 {
 306
 307 }
 308
 309 static inline void usba_init_debugfs(struct usba_udc *udc)
 310 {
 311
 312 }
 313
 314 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
 315 {
 316
 317 }
 318 #endif
 319
 320 static int vbus_is_present(struct usba_udc *udc)
 321 {
 322         if (gpio_is_valid(udc->vbus_pin))
 323                 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
 324
 325         /* No Vbus detection: Assume always present */
 326         return 1;
 327 }
 328
 329 #if defined(CONFIG_ARCH_AT91SAM9RL)
 330
 331 #include <mach/at91_pmc.h>
 332
 333 static void toggle_bias(int is_on)
 334 {
 335         unsigned int uckr = at91_sys_read(AT91_CKGR_UCKR);
 336
 337         if (is_on)
 338                 at91_sys_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
 339         else
 340                 at91_sys_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
 341 }
 342
 343 #else
 344
 345 static void toggle_bias(int is_on)
 346 {
 347 }
 348
 349 #endif /* CONFIG_ARCH_AT91SAM9RL */
 350
 351 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 352 {
 353         unsigned int transaction_len;
 354
 355         transaction_len = req->req.length - req->req.actual;
 356         req->last_transaction = 1;
 357         if (transaction_len > ep->ep.maxpacket) {
 358                 transaction_len = ep->ep.maxpacket;
 359                 req->last_transaction = 0;
 360         } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
 361                 req->last_transaction = 0;
 362
 363         DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
 364                 ep->ep.name, req, transaction_len,
 365                 req->last_transaction ? ", done" : "");
 366
 367         memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
 368         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 369         req->req.actual += transaction_len;
 370 }
 371
 372 static void submit_request(struct usba_ep *ep, struct usba_request *req)
 373 {
 374         DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
 375                 ep->ep.name, req, req->req.length);
 376
 377         req->req.actual = 0;
 378         req->submitted = 1;
 379
 380         if (req->using_dma) {
 381                 if (req->req.length == 0) {
 382                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 383                         return;
 384                 }
 385
 386                 if (req->req.zero)
 387                         usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
 388                 else
 389                         usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
 390
 391                 usba_dma_writel(ep, ADDRESS, req->req.dma);
 392                 usba_dma_writel(ep, CONTROL, req->ctrl);
 393         } else {
 394                 next_fifo_transaction(ep, req);
 395                 if (req->last_transaction) {
 396                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
 397                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 398                 } else {
 399                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
 400                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 401                 }
 402         }
 403 }
 404
 405 static void submit_next_request(struct usba_ep *ep)
 406 {
 407         struct usba_request *req;
 408
 409         if (list_empty(&ep->queue)) {
 410                 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
 411                 return;
 412         }
 413
 414         req = list_entry(ep->queue.next, struct usba_request, queue);
 415         if (!req->submitted)
 416                 submit_request(ep, req);
 417 }
 418
 419 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
 420 {
 421         ep->state = STATUS_STAGE_IN;
 422         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 423         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 424 }
 425
 426 static void receive_data(struct usba_ep *ep)
 427 {
 428         struct usba_udc *udc = ep->udc;
 429         struct usba_request *req;
 430         unsigned long status;
 431         unsigned int bytecount, nr_busy;
 432         int is_complete = 0;
 433
 434         status = usba_ep_readl(ep, STA);
 435         nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 436
 437         DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
 438
 439         while (nr_busy > 0) {
 440                 if (list_empty(&ep->queue)) {
 441                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 442                         break;
 443                 }
 444                 req = list_entry(ep->queue.next,
 445                                  struct usba_request, queue);
 446
 447                 bytecount = USBA_BFEXT(BYTE_COUNT, status);
 448
 449                 if (status & (1 << 31))
 450                         is_complete = 1;
 451                 if (req->req.actual + bytecount >= req->req.length) {
 452                         is_complete = 1;
 453                         bytecount = req->req.length - req->req.actual;
 454                 }
 455
 456                 memcpy_fromio(req->req.buf + req->req.actual,
 457                                 ep->fifo, bytecount);
 458                 req->req.actual += bytecount;
 459
 460                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
 461
 462                 if (is_complete) {
 463                         DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
 464                         req->req.status = 0;
 465                         list_del_init(&req->queue);
 466                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 467                         spin_unlock(&udc->lock);
 468                         req->req.complete(&ep->ep, &req->req);
 469                         spin_lock(&udc->lock);
 470                 }
 471
 472                 status = usba_ep_readl(ep, STA);
 473                 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 474
 475                 if (is_complete && ep_is_control(ep)) {
 476                         send_status(udc, ep);
 477                         break;
 478                 }
 479         }
 480 }
 481
 482 static void
 483 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
 484 {
 485         struct usba_udc *udc = ep->udc;
 486
 487         WARN_ON(!list_empty(&req->queue));
 488
 489         if (req->req.status == -EINPROGRESS)
 490                 req->req.status = status;
 491
 492         if (req->mapped) {
 493                 dma_unmap_single(
 494                         &udc->pdev->dev, req->req.dma, req->req.length,
 495                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 496                 req->req.dma = DMA_ADDR_INVALID;
 497                 req->mapped = 0;
 498         }
 499
 500         DBG(DBG_GADGET | DBG_REQ,
 501                 "%s: req %p complete: status %d, actual %u\n",
 502                 ep->ep.name, req, req->req.status, req->req.actual);
 503
 504         spin_unlock(&udc->lock);
 505         req->req.complete(&ep->ep, &req->req);
 506         spin_lock(&udc->lock);
 507 }
 508
 509 static void
 510 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
 511 {
 512         struct usba_request *req, *tmp_req;
 513
 514         list_for_each_entry_safe(req, tmp_req, list, queue) {
 515                 list_del_init(&req->queue);
 516                 request_complete(ep, req, status);
 517         }
 518 }
 519
 520 static int
 521 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 522 {
 523         struct usba_ep *ep = to_usba_ep(_ep);
 524         struct usba_udc *udc = ep->udc;
 525         unsigned long flags, ept_cfg, maxpacket;
 526         unsigned int nr_trans;
 527
 528         DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
 529
 530         maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
 531
 532         if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
 533                         || ep->index == 0
 534                         || desc->bDescriptorType != USB_DT_ENDPOINT
 535                         || maxpacket == 0
 536                         || maxpacket > ep->fifo_size) {
 537                 DBG(DBG_ERR, "ep_enable: Invalid argument");
 538                 return -EINVAL;
 539         }
 540
 541         ep->is_isoc = 0;
 542         ep->is_in = 0;
 543
 544         if (maxpacket <= 8)
 545                 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
 546         else
 547                 /* LSB is bit 1, not 0 */
 548                 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
 549
 550         DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
 551                         ep->ep.name, ept_cfg, maxpacket);
 552
 553         if (usb_endpoint_dir_in(desc)) {
 554                 ep->is_in = 1;
 555                 ept_cfg |= USBA_EPT_DIR_IN;
 556         }
 557
 558         switch (usb_endpoint_type(desc)) {
 559         case USB_ENDPOINT_XFER_CONTROL:
 560                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 561                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
 562                 break;
 563         case USB_ENDPOINT_XFER_ISOC:
 564                 if (!ep->can_isoc) {
 565                         DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
 566                                         ep->ep.name);
 567                         return -EINVAL;
 568                 }
 569
 570                 /*
 571                  * Bits 11:12 specify number of _additional_
 572                  * transactions per microframe.
 573                  */
 574                 nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
 575                 if (nr_trans > 3)
 576                         return -EINVAL;
 577
 578                 ep->is_isoc = 1;
 579                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 580
 581                 /*
 582                  * Do triple-buffering on high-bandwidth iso endpoints.
 583                  */
 584                 if (nr_trans > 1 && ep->nr_banks == 3)
 585                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
 586                 else
 587                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 588                 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 589                 break;
 590         case USB_ENDPOINT_XFER_BULK:
 591                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 592                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 593                 break;
 594         case USB_ENDPOINT_XFER_INT:
 595                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 596                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 597                 break;
 598         }
 599
 600         spin_lock_irqsave(&ep->udc->lock, flags);
 601
 602         if (ep->desc) {
 603                 spin_unlock_irqrestore(&ep->udc->lock, flags);
 604                 DBG(DBG_ERR, "ep%d already enabled\n", ep->index);
 605                 return -EBUSY;
 606         }
 607
 608         ep->desc = desc;
 609         ep->ep.maxpacket = maxpacket;
 610
 611         usba_ep_writel(ep, CFG, ept_cfg);
 612         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 613
 614         if (ep->can_dma) {
 615                 u32 ctrl;
 616
 617                 usba_writel(udc, INT_ENB,
 618                                 (usba_readl(udc, INT_ENB)
 619                                         | USBA_BF(EPT_INT, 1 << ep->index)
 620                                         | USBA_BF(DMA_INT, 1 << ep->index)));
 621                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 622                 usba_ep_writel(ep, CTL_ENB, ctrl);
 623         } else {
 624                 usba_writel(udc, INT_ENB,
 625                                 (usba_readl(udc, INT_ENB)
 626                                         | USBA_BF(EPT_INT, 1 << ep->index)));
 627         }
 628
 629         spin_unlock_irqrestore(&udc->lock, flags);
 630
 631         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 632                         (unsigned long)usba_ep_readl(ep, CFG));
 633         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 634                         (unsigned long)usba_readl(udc, INT_ENB));
 635
 636         return 0;
 637 }
 638
 639 static int usba_ep_disable(struct usb_ep *_ep)
 640 {
 641         struct usba_ep *ep = to_usba_ep(_ep);
 642         struct usba_udc *udc = ep->udc;
 643         LIST_HEAD(req_list);
 644         unsigned long flags;
 645
 646         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 647
 648         spin_lock_irqsave(&udc->lock, flags);
 649
 650         if (!ep->desc) {
 651                 spin_unlock_irqrestore(&udc->lock, flags);
 652                 /* REVISIT because this driver disables endpoints in
 653                  * reset_all_endpoints() before calling disconnect(),
 654                  * most gadget drivers would trigger this non-error ...
 655                  */
 656                 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
 657                         DBG(DBG_ERR, "ep_disable: %s not enabled\n",
 658                                         ep->ep.name);
 659                 return -EINVAL;
 660         }
 661         ep->desc = NULL;
 662
 663         list_splice_init(&ep->queue, &req_list);
 664         if (ep->can_dma) {
 665                 usba_dma_writel(ep, CONTROL, 0);
 666                 usba_dma_writel(ep, ADDRESS, 0);
 667                 usba_dma_readl(ep, STATUS);
 668         }
 669         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 670         usba_writel(udc, INT_ENB,
 671                         usba_readl(udc, INT_ENB)
 672                         & ~USBA_BF(EPT_INT, 1 << ep->index));
 673
 674         request_complete_list(ep, &req_list, -ESHUTDOWN);
 675
 676         spin_unlock_irqrestore(&udc->lock, flags);
 677
 678         return 0;
 679 }
 680
 681 static struct usb_request *
 682 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 683 {
 684         struct usba_request *req;
 685
 686         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 687
 688         req = kzalloc(sizeof(*req), gfp_flags);
 689         if (!req)
 690                 return NULL;
 691
 692         INIT_LIST_HEAD(&req->queue);
 693         req->req.dma = DMA_ADDR_INVALID;
 694
 695         return &req->req;
 696 }
 697
 698 static void
 699 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 700 {
 701         struct usba_request *req = to_usba_req(_req);
 702
 703         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 704
 705         kfree(req);
 706 }
 707
 708 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 709                 struct usba_request *req, gfp_t gfp_flags)
 710 {
 711         unsigned long flags;
 712         int ret;
 713
 714         DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
 715                 ep->ep.name, req->req.length, req->req.dma,
 716                 req->req.zero ? 'Z' : 'z',
 717                 req->req.short_not_ok ? 'S' : 's',
 718                 req->req.no_interrupt ? 'I' : 'i');
 719
 720         if (req->req.length > 0x10000) {
 721                 /* Lengths from 0 to 65536 (inclusive) are supported */
 722                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 723                 return -EINVAL;
 724         }
 725
 726         req->using_dma = 1;
 727
 728         if (req->req.dma == DMA_ADDR_INVALID) {
 729                 req->req.dma = dma_map_single(
 730                         &udc->pdev->dev, req->req.buf, req->req.length,
 731                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 732                 req->mapped = 1;
 733         } else {
 734                 dma_sync_single_for_device(
 735                         &udc->pdev->dev, req->req.dma, req->req.length,
 736                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 737                 req->mapped = 0;
 738         }
 739
 740         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 741                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 742                         | USBA_DMA_END_BUF_EN;
 743
 744         if (!ep->is_in)
 745                 req->ctrl |= USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 746
 747         /*
 748          * Add this request to the queue and submit for DMA if
 749          * possible. Check if we're still alive first -- we may have
 750          * received a reset since last time we checked.
 751          */
 752         ret = -ESHUTDOWN;
 753         spin_lock_irqsave(&udc->lock, flags);
 754         if (ep->desc) {
 755                 if (list_empty(&ep->queue))
 756                         submit_request(ep, req);
 757
 758                 list_add_tail(&req->queue, &ep->queue);
 759                 ret = 0;
 760         }
 761         spin_unlock_irqrestore(&udc->lock, flags);
 762
 763         return ret;
 764 }
 765
 766 static int
 767 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 768 {
 769         struct usba_request *req = to_usba_req(_req);
 770         struct usba_ep *ep = to_usba_ep(_ep);
 771         struct usba_udc *udc = ep->udc;
 772         unsigned long flags;
 773         int ret;
 774
 775         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 776                         ep->ep.name, req, _req->length);
 777
 778         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN || !ep->desc)
 779                 return -ESHUTDOWN;
 780
 781         req->submitted = 0;
 782         req->using_dma = 0;
 783         req->last_transaction = 0;
 784
 785         _req->status = -EINPROGRESS;
 786         _req->actual = 0;
 787
 788         if (ep->can_dma)
 789                 return queue_dma(udc, ep, req, gfp_flags);
 790
 791         /* May have received a reset since last time we checked */
 792         ret = -ESHUTDOWN;
 793         spin_lock_irqsave(&udc->lock, flags);
 794         if (ep->desc) {
 795                 list_add_tail(&req->queue, &ep->queue);
 796
 797                 if ((!ep_is_control(ep) && ep->is_in) ||
 798                         (ep_is_control(ep)
 799                                 && (ep->state == DATA_STAGE_IN
 800                                         || ep->state == STATUS_STAGE_IN)))
 801                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 802                 else
 803                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 804                 ret = 0;
 805         }
 806         spin_unlock_irqrestore(&udc->lock, flags);
 807
 808         return ret;
 809 }
 810
 811 static void
 812 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 813 {
 814         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 815 }
 816
 817 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 818 {
 819         unsigned int timeout;
 820         u32 status;
 821
 822         /*
 823          * Stop the DMA controller. When writing both CH_EN
 824          * and LINK to 0, the other bits are not affected.
 825          */
 826         usba_dma_writel(ep, CONTROL, 0);
 827
 828         /* Wait for the FIFO to empty */
 829         for (timeout = 40; timeout; --timeout) {
 830                 status = usba_dma_readl(ep, STATUS);
 831                 if (!(status & USBA_DMA_CH_EN))
 832                         break;
 833                 udelay(1);
 834         }
 835
 836         if (pstatus)
 837                 *pstatus = status;
 838
 839         if (timeout == 0) {
 840                 dev_err(&ep->udc->pdev->dev,
 841                         "%s: timed out waiting for DMA FIFO to empty\n",
 842                         ep->ep.name);
 843                 return -ETIMEDOUT;
 844         }
 845
 846         return 0;
 847 }
 848
 849 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 850 {
 851         struct usba_ep *ep = to_usba_ep(_ep);
 852         struct usba_udc *udc = ep->udc;
 853         struct usba_request *req;
 854         unsigned long flags;
 855         u32 status;
 856
 857         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 858                         ep->ep.name, req);
 859
 860         spin_lock_irqsave(&udc->lock, flags);
 861
 862         list_for_each_entry(req, &ep->queue, queue) {
 863                 if (&req->req == _req)
 864                         break;
 865         }
 866
 867         if (&req->req != _req) {
 868                 spin_unlock_irqrestore(&udc->lock, flags);
 869                 return -EINVAL;
 870         }
 871
 872         if (req->using_dma) {
 873                 /*
 874                  * If this request is currently being transferred,
 875                  * stop the DMA controller and reset the FIFO.
 876                  */
 877                 if (ep->queue.next == &req->queue) {
 878                         status = usba_dma_readl(ep, STATUS);
 879                         if (status & USBA_DMA_CH_EN)
 880                                 stop_dma(ep, &status);
 881
 882 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 883                         ep->last_dma_status = status;
 884 #endif
 885
 886                         usba_writel(udc, EPT_RST, 1 << ep->index);
 887
 888                         usba_update_req(ep, req, status);
 889                 }
 890         }
 891
 892         /*
 893          * Errors should stop the queue from advancing until the
 894          * completion function returns.
 895          */
 896         list_del_init(&req->queue);
 897
 898         request_complete(ep, req, -ECONNRESET);
 899
 900         /* Process the next request if any */
 901         submit_next_request(ep);
 902         spin_unlock_irqrestore(&udc->lock, flags);
 903
 904         return 0;
 905 }
 906
 907 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 908 {
 909         struct usba_ep *ep = to_usba_ep(_ep);
 910         struct usba_udc *udc = ep->udc;
 911         unsigned long flags;
 912         int ret = 0;
 913
 914         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 915                         value ? "set" : "clear");
 916
 917         if (!ep->desc) {
 918                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 919                                 ep->ep.name);
 920                 return -ENODEV;
 921         }
 922         if (ep->is_isoc) {
 923                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 924                                 ep->ep.name);
 925                 return -ENOTTY;
 926         }
 927
 928         spin_lock_irqsave(&udc->lock, flags);
 929
 930         /*
 931          * We can't halt IN endpoints while there are still data to be
 932          * transferred
 933          */
 934         if (!list_empty(&ep->queue)
 935                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 936                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 937                 ret = -EAGAIN;
 938         } else {
 939                 if (value)
 940                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 941                 else
 942                         usba_ep_writel(ep, CLR_STA,
 943                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 944                 usba_ep_readl(ep, STA);
 945         }
 946
 947         spin_unlock_irqrestore(&udc->lock, flags);
 948
 949         return ret;
 950 }
 951
 952 static int usba_ep_fifo_status(struct usb_ep *_ep)
 953 {
 954         struct usba_ep *ep = to_usba_ep(_ep);
 955
 956         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 957 }
 958
 959 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 960 {
 961         struct usba_ep *ep = to_usba_ep(_ep);
 962         struct usba_udc *udc = ep->udc;
 963
 964         usba_writel(udc, EPT_RST, 1 << ep->index);
 965 }
 966
 967 static const struct usb_ep_ops usba_ep_ops = {
 968         .enable         = usba_ep_enable,
 969         .disable        = usba_ep_disable,
 970         .alloc_request  = usba_ep_alloc_request,
 971         .free_request   = usba_ep_free_request,
 972         .queue          = usba_ep_queue,
 973         .dequeue        = usba_ep_dequeue,
 974         .set_halt       = usba_ep_set_halt,
 975         .fifo_status    = usba_ep_fifo_status,
 976         .fifo_flush     = usba_ep_fifo_flush,
 977 };
 978
 979 static int usba_udc_get_frame(struct usb_gadget *gadget)
 980 {
 981         struct usba_udc *udc = to_usba_udc(gadget);
 982
 983         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 984 }
 985
 986 static int usba_udc_wakeup(struct usb_gadget *gadget)
 987 {
 988         struct usba_udc *udc = to_usba_udc(gadget);
 989         unsigned long flags;
 990         u32 ctrl;
 991         int ret = -EINVAL;
 992
 993         spin_lock_irqsave(&udc->lock, flags);
 994         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 995                 ctrl = usba_readl(udc, CTRL);
 996                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 997                 ret = 0;
 998         }
 999         spin_unlock_irqrestore(&udc->lock, flags);
1000
1001         return ret;
1002 }
1003
1004 static int
1005 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
1006 {
1007         struct usba_udc *udc = to_usba_udc(gadget);
1008         unsigned long flags;
1009
1010         spin_lock_irqsave(&udc->lock, flags);
1011         if (is_selfpowered)
1012                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1013         else
1014                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1015         spin_unlock_irqrestore(&udc->lock, flags);
1016
1017         return 0;
1018 }
1019
1020 static int atmel_usba_start(struct usb_gadget_driver *driver,
1021                 int (*bind)(struct usb_gadget *));
1022 static int atmel_usba_stop(struct usb_gadget_driver *driver);
1023
1024 static const struct usb_gadget_ops usba_udc_ops = {
1025         .get_frame              = usba_udc_get_frame,
1026         .wakeup                 = usba_udc_wakeup,
1027         .set_selfpowered        = usba_udc_set_selfpowered,
1028         .start                  = atmel_usba_start,
1029         .stop                   = atmel_usba_stop,
1030 };
1031
1032 static struct usb_endpoint_descriptor usba_ep0_desc = {
1033         .bLength = USB_DT_ENDPOINT_SIZE,
1034         .bDescriptorType = USB_DT_ENDPOINT,
1035         .bEndpointAddress = 0,
1036         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1037         .wMaxPacketSize = cpu_to_le16(64),
1038         /* FIXME: I have no idea what to put here */
1039         .bInterval = 1,
1040 };
1041
1042 static void nop_release(struct device *dev)
1043 {
1044
1045 }
1046
1047 static struct usba_udc the_udc = {
1048         .gadget = {
1049                 .ops            = &usba_udc_ops,
1050                 .ep_list        = LIST_HEAD_INIT(the_udc.gadget.ep_list),
1051                 .is_dualspeed   = 1,
1052                 .name           = "atmel_usba_udc",
1053                 .dev    = {
1054                         .init_name      = "gadget",
1055                         .release        = nop_release,
1056                 },
1057         },
1058 };
1059
1060 /*
1061  * Called with interrupts disabled and udc->lock held.
1062  */
1063 static void reset_all_endpoints(struct usba_udc *udc)
1064 {
1065         struct usba_ep *ep;
1066         struct usba_request *req, *tmp_req;
1067
1068         usba_writel(udc, EPT_RST, ~0UL);
1069
1070         ep = to_usba_ep(udc->gadget.ep0);
1071         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1072                 list_del_init(&req->queue);
1073                 request_complete(ep, req, -ECONNRESET);
1074         }
1075
1076         /* NOTE:  normally, the next call to the gadget driver is in
1077          * charge of disabling endpoints... usually disconnect().
1078          * The exception would be entering a high speed test mode.
1079          *
1080          * FIXME remove this code ... and retest thoroughly.
1081          */
1082         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1083                 if (ep->desc) {
1084                         spin_unlock(&udc->lock);
1085                         usba_ep_disable(&ep->ep);
1086                         spin_lock(&udc->lock);
1087                 }
1088         }
1089 }
1090
1091 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1092 {
1093         struct usba_ep *ep;
1094
1095         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1096                 return to_usba_ep(udc->gadget.ep0);
1097
1098         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1099                 u8 bEndpointAddress;
1100
1101                 if (!ep->desc)
1102                         continue;
1103                 bEndpointAddress = ep->desc->bEndpointAddress;
1104                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1105                         continue;
1106                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1107                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1108                         return ep;
1109         }
1110
1111         return NULL;
1112 }
1113
1114 /* Called with interrupts disabled and udc->lock held */
1115 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1116 {
1117         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1118         ep->state = WAIT_FOR_SETUP;
1119 }
1120
1121 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1122 {
1123         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1124                 return 1;
1125         return 0;
1126 }
1127
1128 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1129 {
1130         u32 regval;
1131
1132         DBG(DBG_BUS, "setting address %u...\n", addr);
1133         regval = usba_readl(udc, CTRL);
1134         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1135         usba_writel(udc, CTRL, regval);
1136 }
1137
1138 static int do_test_mode(struct usba_udc *udc)
1139 {
1140         static const char test_packet_buffer[] = {
1141                 /* JKJKJKJK * 9 */
1142                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1143                 /* JJKKJJKK * 8 */
1144                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1145                 /* JJKKJJKK * 8 */
1146                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1147                 /* JJJJJJJKKKKKKK * 8 */
1148                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1149                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1150                 /* JJJJJJJK * 8 */
1151                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1152                 /* {JKKKKKKK * 10}, JK */
1153                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1154         };
1155         struct usba_ep *ep;
1156         struct device *dev = &udc->pdev->dev;
1157         int test_mode;
1158
1159         test_mode = udc->test_mode;
1160
1161         /* Start from a clean slate */
1162         reset_all_endpoints(udc);
1163
1164         switch (test_mode) {
1165         case 0x0100:
1166                 /* Test_J */
1167                 usba_writel(udc, TST, USBA_TST_J_MODE);
1168                 dev_info(dev, "Entering Test_J mode...\n");
1169                 break;
1170         case 0x0200:
1171                 /* Test_K */
1172                 usba_writel(udc, TST, USBA_TST_K_MODE);
1173                 dev_info(dev, "Entering Test_K mode...\n");
1174                 break;
1175         case 0x0300:
1176                 /*
1177                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1178                  * for Bulk IN transfers
1179                  */
1180                 ep = &usba_ep[0];
1181                 usba_writel(udc, TST,
1182                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1183                 usba_ep_writel(ep, CFG,
1184                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1185                                 | USBA_EPT_DIR_IN
1186                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1187                                 | USBA_BF(BK_NUMBER, 1));
1188                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1189                         set_protocol_stall(udc, ep);
1190                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1191                 } else {
1192                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1193                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1194                 }
1195                 break;
1196         case 0x0400:
1197                 /* Test_Packet */
1198                 ep = &usba_ep[0];
1199                 usba_ep_writel(ep, CFG,
1200                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1201                                 | USBA_EPT_DIR_IN
1202                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1203                                 | USBA_BF(BK_NUMBER, 1));
1204                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1205                         set_protocol_stall(udc, ep);
1206                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1207                 } else {
1208                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1209                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1210                         memcpy_toio(ep->fifo, test_packet_buffer,
1211                                         sizeof(test_packet_buffer));
1212                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1213                         dev_info(dev, "Entering Test_Packet mode...\n");
1214                 }
1215                 break;
1216         default:
1217                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1218                 return -EINVAL;
1219         }
1220
1221         return 0;
1222 }
1223
1224 /* Avoid overly long expressions */
1225 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1226 {
1227         if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1228                 return true;
1229         return false;
1230 }
1231
1232 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1233 {
1234         if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1235                 return true;
1236         return false;
1237 }
1238
1239 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1240 {
1241         if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1242                 return true;
1243         return false;
1244 }
1245
1246 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1247                 struct usb_ctrlrequest *crq)
1248 {
1249         int retval = 0;
1250
1251         switch (crq->bRequest) {
1252         case USB_REQ_GET_STATUS: {
1253                 u16 status;
1254
1255                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1256                         status = cpu_to_le16(udc->devstatus);
1257                 } else if (crq->bRequestType
1258                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1259                         status = cpu_to_le16(0);
1260                 } else if (crq->bRequestType
1261                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1262                         struct usba_ep *target;
1263
1264                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1265                         if (!target)
1266                                 goto stall;
1267
1268                         status = 0;
1269                         if (is_stalled(udc, target))
1270                                 status |= cpu_to_le16(1);
1271                 } else
1272                         goto delegate;
1273
1274                 /* Write directly to the FIFO. No queueing is done. */
1275                 if (crq->wLength != cpu_to_le16(sizeof(status)))
1276                         goto stall;
1277                 ep->state = DATA_STAGE_IN;
1278                 __raw_writew(status, ep->fifo);
1279                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1280                 break;
1281         }
1282
1283         case USB_REQ_CLEAR_FEATURE: {
1284                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1285                         if (feature_is_dev_remote_wakeup(crq))
1286                                 udc->devstatus
1287                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1288                         else
1289                                 /* Can't CLEAR_FEATURE TEST_MODE */
1290                                 goto stall;
1291                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1292                         struct usba_ep *target;
1293
1294                         if (crq->wLength != cpu_to_le16(0)
1295                                         || !feature_is_ep_halt(crq))
1296                                 goto stall;
1297                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1298                         if (!target)
1299                                 goto stall;
1300
1301                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1302                         if (target->index != 0)
1303                                 usba_ep_writel(target, CLR_STA,
1304                                                 USBA_TOGGLE_CLR);
1305                 } else {
1306                         goto delegate;
1307                 }
1308
1309                 send_status(udc, ep);
1310                 break;
1311         }
1312
1313         case USB_REQ_SET_FEATURE: {
1314                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1315                         if (feature_is_dev_test_mode(crq)) {
1316                                 send_status(udc, ep);
1317                                 ep->state = STATUS_STAGE_TEST;
1318                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1319                                 return 0;
1320                         } else if (feature_is_dev_remote_wakeup(crq)) {
1321                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1322                         } else {
1323                                 goto stall;
1324                         }
1325                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1326                         struct usba_ep *target;
1327
1328                         if (crq->wLength != cpu_to_le16(0)
1329                                         || !feature_is_ep_halt(crq))
1330                                 goto stall;
1331
1332                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1333                         if (!target)
1334                                 goto stall;
1335
1336                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1337                 } else
1338                         goto delegate;
1339
1340                 send_status(udc, ep);
1341                 break;
1342         }
1343
1344         case USB_REQ_SET_ADDRESS:
1345                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1346                         goto delegate;
1347
1348                 set_address(udc, le16_to_cpu(crq->wValue));
1349                 send_status(udc, ep);
1350                 ep->state = STATUS_STAGE_ADDR;
1351                 break;
1352
1353         default:
1354 delegate:
1355                 spin_unlock(&udc->lock);
1356                 retval = udc->driver->setup(&udc->gadget, crq);
1357                 spin_lock(&udc->lock);
1358         }
1359
1360         return retval;
1361
1362 stall:
1363         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1364                 "halting endpoint...\n",
1365                 ep->ep.name, crq->bRequestType, crq->bRequest,
1366                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1367                 le16_to_cpu(crq->wLength));
1368         set_protocol_stall(udc, ep);
1369         return -1;
1370 }
1371
1372 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1373 {
1374         struct usba_request *req;
1375         u32 epstatus;
1376         u32 epctrl;
1377
1378 restart:
1379         epstatus = usba_ep_readl(ep, STA);
1380         epctrl = usba_ep_readl(ep, CTL);
1381
1382         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1383                         ep->ep.name, ep->state, epstatus, epctrl);
1384
1385         req = NULL;
1386         if (!list_empty(&ep->queue))
1387                 req = list_entry(ep->queue.next,
1388                                  struct usba_request, queue);
1389
1390         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1391                 if (req->submitted)
1392                         next_fifo_transaction(ep, req);
1393                 else
1394                         submit_request(ep, req);
1395
1396                 if (req->last_transaction) {
1397                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1398                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1399                 }
1400                 goto restart;
1401         }
1402         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1403                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1404
1405                 switch (ep->state) {
1406                 case DATA_STAGE_IN:
1407                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1408                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1409                         ep->state = STATUS_STAGE_OUT;
1410                         break;
1411                 case STATUS_STAGE_ADDR:
1412                         /* Activate our new address */
1413                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1414                                                 | USBA_FADDR_EN));
1415                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1416                         ep->state = WAIT_FOR_SETUP;
1417                         break;
1418                 case STATUS_STAGE_IN:
1419                         if (req) {
1420                                 list_del_init(&req->queue);
1421                                 request_complete(ep, req, 0);
1422                                 submit_next_request(ep);
1423                         }
1424                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1425                         ep->state = WAIT_FOR_SETUP;
1426                         break;
1427                 case STATUS_STAGE_TEST:
1428                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1429                         ep->state = WAIT_FOR_SETUP;
1430                         if (do_test_mode(udc))
1431                                 set_protocol_stall(udc, ep);
1432                         break;
1433                 default:
1434                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1435                                 "halting endpoint...\n",
1436                                 ep->ep.name, ep->state);
1437                         set_protocol_stall(udc, ep);
1438                         break;
1439                 }
1440
1441                 goto restart;
1442         }
1443         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1444                 switch (ep->state) {
1445                 case STATUS_STAGE_OUT:
1446                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1447                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1448
1449                         if (req) {
1450                                 list_del_init(&req->queue);
1451                                 request_complete(ep, req, 0);
1452                         }
1453                         ep->state = WAIT_FOR_SETUP;
1454                         break;
1455
1456                 case DATA_STAGE_OUT:
1457                         receive_data(ep);
1458                         break;
1459
1460                 default:
1461                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1462                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1463                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1464                                 "halting endpoint...\n",
1465                                 ep->ep.name, ep->state);
1466                         set_protocol_stall(udc, ep);
1467                         break;
1468                 }
1469
1470                 goto restart;
1471         }
1472         if (epstatus & USBA_RX_SETUP) {
1473                 union {
1474                         struct usb_ctrlrequest crq;
1475                         unsigned long data[2];
1476                 } crq;
1477                 unsigned int pkt_len;
1478                 int ret;
1479
1480                 if (ep->state != WAIT_FOR_SETUP) {
1481                         /*
1482                          * Didn't expect a SETUP packet at this
1483                          * point. Clean up any pending requests (which
1484                          * may be successful).
1485                          */
1486                         int status = -EPROTO;
1487
1488                         /*
1489                          * RXRDY and TXCOMP are dropped when SETUP
1490                          * packets arrive.  Just pretend we received
1491                          * the status packet.
1492                          */
1493                         if (ep->state == STATUS_STAGE_OUT
1494                                         || ep->state == STATUS_STAGE_IN) {
1495                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1496                                 status = 0;
1497                         }
1498
1499                         if (req) {
1500                                 list_del_init(&req->queue);
1501                                 request_complete(ep, req, status);
1502                         }
1503                 }
1504
1505                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1506                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1507                 if (pkt_len != sizeof(crq)) {
1508                         pr_warning("udc: Invalid packet length %u "
1509                                 "(expected %zu)\n", pkt_len, sizeof(crq));
1510                         set_protocol_stall(udc, ep);
1511                         return;
1512                 }
1513
1514                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1515                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1516
1517                 /* Free up one bank in the FIFO so that we can
1518                  * generate or receive a reply right away. */
1519                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1520
1521                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1522                         ep->state, crq.crq.bRequestType,
1523                         crq.crq.bRequest); */
1524
1525                 if (crq.crq.bRequestType & USB_DIR_IN) {
1526                         /*
1527                          * The USB 2.0 spec states that "if wLength is
1528                          * zero, there is no data transfer phase."
1529                          * However, testusb #14 seems to actually
1530                          * expect a data phase even if wLength = 0...
1531                          */
1532                         ep->state = DATA_STAGE_IN;
1533                 } else {
1534                         if (crq.crq.wLength != cpu_to_le16(0))
1535                                 ep->state = DATA_STAGE_OUT;
1536                         else
1537                                 ep->state = STATUS_STAGE_IN;
1538                 }
1539
1540                 ret = -1;
1541                 if (ep->index == 0)
1542                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1543                 else {
1544                         spin_unlock(&udc->lock);
1545                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1546                         spin_lock(&udc->lock);
1547                 }
1548
1549                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1550                         crq.crq.bRequestType, crq.crq.bRequest,
1551                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1552
1553                 if (ret < 0) {
1554                         /* Let the host know that we failed */
1555                         set_protocol_stall(udc, ep);
1556                 }
1557         }
1558 }
1559
1560 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1561 {
1562         struct usba_request *req;
1563         u32 epstatus;
1564         u32 epctrl;
1565
1566         epstatus = usba_ep_readl(ep, STA);
1567         epctrl = usba_ep_readl(ep, CTL);
1568
1569         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1570
1571         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1572                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1573
1574                 if (list_empty(&ep->queue)) {
1575                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1576                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1577                         return;
1578                 }
1579
1580                 req = list_entry(ep->queue.next, struct usba_request, queue);
1581
1582                 if (req->using_dma) {
1583                         /* Send a zero-length packet */
1584                         usba_ep_writel(ep, SET_STA,
1585                                         USBA_TX_PK_RDY);
1586                         usba_ep_writel(ep, CTL_DIS,
1587                                         USBA_TX_PK_RDY);
1588                         list_del_init(&req->queue);
1589                         submit_next_request(ep);
1590                         request_complete(ep, req, 0);
1591                 } else {
1592                         if (req->submitted)
1593                                 next_fifo_transaction(ep, req);
1594                         else
1595                                 submit_request(ep, req);
1596
1597                         if (req->last_transaction) {
1598                                 list_del_init(&req->queue);
1599                                 submit_next_request(ep);
1600                                 request_complete(ep, req, 0);
1601                         }
1602                 }
1603
1604                 epstatus = usba_ep_readl(ep, STA);
1605                 epctrl = usba_ep_readl(ep, CTL);
1606         }
1607         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1608                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1609                 receive_data(ep);
1610         }
1611 }
1612
1613 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1614 {
1615         struct usba_request *req;
1616         u32 status, control, pending;
1617
1618         status = usba_dma_readl(ep, STATUS);
1619         control = usba_dma_readl(ep, CONTROL);
1620 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1621         ep->last_dma_status = status;
1622 #endif
1623         pending = status & control;
1624         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1625
1626         if (status & USBA_DMA_CH_EN) {
1627                 dev_err(&udc->pdev->dev,
1628                         "DMA_CH_EN is set after transfer is finished!\n");
1629                 dev_err(&udc->pdev->dev,
1630                         "status=%#08x, pending=%#08x, control=%#08x\n",
1631                         status, pending, control);
1632
1633                 /*
1634                  * try to pretend nothing happened. We might have to
1635                  * do something here...
1636                  */
1637         }
1638
1639         if (list_empty(&ep->queue))
1640                 /* Might happen if a reset comes along at the right moment */
1641                 return;
1642
1643         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1644                 req = list_entry(ep->queue.next, struct usba_request, queue);
1645                 usba_update_req(ep, req, status);
1646
1647                 list_del_init(&req->queue);
1648                 submit_next_request(ep);
1649                 request_complete(ep, req, 0);
1650         }
1651 }
1652
1653 static irqreturn_t usba_udc_irq(int irq, void *devid)
1654 {
1655         struct usba_udc *udc = devid;
1656         u32 status;
1657         u32 dma_status;
1658         u32 ep_status;
1659
1660         spin_lock(&udc->lock);
1661
1662         status = usba_readl(udc, INT_STA);
1663         DBG(DBG_INT, "irq, status=%#08x\n", status);
1664
1665         if (status & USBA_DET_SUSPEND) {
1666                 toggle_bias(0);
1667                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1668                 DBG(DBG_BUS, "Suspend detected\n");
1669                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1670                                 && udc->driver && udc->driver->suspend) {
1671                         spin_unlock(&udc->lock);
1672                         udc->driver->suspend(&udc->gadget);
1673                         spin_lock(&udc->lock);
1674                 }
1675         }
1676
1677         if (status & USBA_WAKE_UP) {
1678                 toggle_bias(1);
1679                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1680                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1681         }
1682
1683         if (status & USBA_END_OF_RESUME) {
1684                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1685                 DBG(DBG_BUS, "Resume detected\n");
1686                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1687                                 && udc->driver && udc->driver->resume) {
1688                         spin_unlock(&udc->lock);
1689                         udc->driver->resume(&udc->gadget);
1690                         spin_lock(&udc->lock);
1691                 }
1692         }
1693
1694         dma_status = USBA_BFEXT(DMA_INT, status);
1695         if (dma_status) {
1696                 int i;
1697
1698                 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1699                         if (dma_status & (1 << i))
1700                                 usba_dma_irq(udc, &usba_ep[i]);
1701         }
1702
1703         ep_status = USBA_BFEXT(EPT_INT, status);
1704         if (ep_status) {
1705                 int i;
1706
1707                 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1708                         if (ep_status & (1 << i)) {
1709                                 if (ep_is_control(&usba_ep[i]))
1710                                         usba_control_irq(udc, &usba_ep[i]);
1711                                 else
1712                                         usba_ep_irq(udc, &usba_ep[i]);
1713                         }
1714         }
1715
1716         if (status & USBA_END_OF_RESET) {
1717                 struct usba_ep *ep0;
1718
1719                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1720                 reset_all_endpoints(udc);
1721
1722                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1723                                 && udc->driver->disconnect) {
1724                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1725                         spin_unlock(&udc->lock);
1726                         udc->driver->disconnect(&udc->gadget);
1727                         spin_lock(&udc->lock);
1728                 }
1729
1730                 if (status & USBA_HIGH_SPEED)
1731                         udc->gadget.speed = USB_SPEED_HIGH;
1732                 else
1733                         udc->gadget.speed = USB_SPEED_FULL;
1734                 DBG(DBG_BUS, "%s bus reset detected\n",
1735                     usb_speed_string(udc->gadget.speed));
1736
1737                 ep0 = &usba_ep[0];
1738                 ep0->desc = &usba_ep0_desc;
1739                 ep0->state = WAIT_FOR_SETUP;
1740                 usba_ep_writel(ep0, CFG,
1741                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1742                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1743                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1744                 usba_ep_writel(ep0, CTL_ENB,
1745                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1746                 usba_writel(udc, INT_ENB,
1747                                 (usba_readl(udc, INT_ENB)
1748                                 | USBA_BF(EPT_INT, 1)
1749                                 | USBA_DET_SUSPEND
1750                                 | USBA_END_OF_RESUME));
1751
1752                 /*
1753                  * Unclear why we hit this irregularly, e.g. in usbtest,
1754                  * but it's clearly harmless...
1755                  */
1756                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1757                         dev_dbg(&udc->pdev->dev,
1758                                  "ODD: EP0 configuration is invalid!\n");
1759         }
1760
1761         spin_unlock(&udc->lock);
1762
1763         return IRQ_HANDLED;
1764 }
1765
1766 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1767 {
1768         struct usba_udc *udc = devid;
1769         int vbus;
1770
1771         /* debounce */
1772         udelay(10);
1773
1774         spin_lock(&udc->lock);
1775
1776         /* May happen if Vbus pin toggles during probe() */
1777         if (!udc->driver)
1778                 goto out;
1779
1780         vbus = vbus_is_present(udc);
1781         if (vbus != udc->vbus_prev) {
1782                 if (vbus) {
1783                         toggle_bias(1);
1784                         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1785                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1786                 } else {
1787                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1788                         reset_all_endpoints(udc);
1789                         toggle_bias(0);
1790                         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1791                         if (udc->driver->disconnect) {
1792                                 spin_unlock(&udc->lock);
1793                                 udc->driver->disconnect(&udc->gadget);
1794                                 spin_lock(&udc->lock);
1795                         }
1796                 }
1797                 udc->vbus_prev = vbus;
1798         }
1799
1800 out:
1801         spin_unlock(&udc->lock);
1802
1803         return IRQ_HANDLED;
1804 }
1805
1806 static int atmel_usba_start(struct usb_gadget_driver *driver,
1807                 int (*bind)(struct usb_gadget *))
1808 {
1809         struct usba_udc *udc = &the_udc;
1810         unsigned long flags;
1811         int ret;
1812
1813         if (!udc->pdev)
1814                 return -ENODEV;
1815
1816         spin_lock_irqsave(&udc->lock, flags);
1817         if (udc->driver) {
1818                 spin_unlock_irqrestore(&udc->lock, flags);
1819                 return -EBUSY;
1820         }
1821
1822         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1823         udc->driver = driver;
1824         udc->gadget.dev.driver = &driver->driver;
1825         spin_unlock_irqrestore(&udc->lock, flags);
1826
1827         clk_enable(udc->pclk);
1828         clk_enable(udc->hclk);
1829
1830         ret = bind(&udc->gadget);
1831         if (ret) {
1832                 DBG(DBG_ERR, "Could not bind to driver %s: error %d\n",
1833                         driver->driver.name, ret);
1834                 goto err_driver_bind;
1835         }
1836
1837         DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1838
1839         udc->vbus_prev = 0;
1840         if (gpio_is_valid(udc->vbus_pin))
1841                 enable_irq(gpio_to_irq(udc->vbus_pin));
1842
1843         /* If Vbus is present, enable the controller and wait for reset */
1844         spin_lock_irqsave(&udc->lock, flags);
1845         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1846                 toggle_bias(1);
1847                 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1848                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1849         }
1850         spin_unlock_irqrestore(&udc->lock, flags);
1851
1852         return 0;
1853
1854 err_driver_bind:
1855         udc->driver = NULL;
1856         udc->gadget.dev.driver = NULL;
1857         return ret;
1858 }
1859
1860 static int atmel_usba_stop(struct usb_gadget_driver *driver)
1861 {
1862         struct usba_udc *udc = &the_udc;
1863         unsigned long flags;
1864
1865         if (!udc->pdev)
1866                 return -ENODEV;
1867         if (driver != udc->driver || !driver->unbind)
1868                 return -EINVAL;
1869
1870         if (gpio_is_valid(udc->vbus_pin))
1871                 disable_irq(gpio_to_irq(udc->vbus_pin));
1872
1873         spin_lock_irqsave(&udc->lock, flags);
1874         udc->gadget.speed = USB_SPEED_UNKNOWN;
1875         reset_all_endpoints(udc);
1876         spin_unlock_irqrestore(&udc->lock, flags);
1877
1878         /* This will also disable the DP pullup */
1879         toggle_bias(0);
1880         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1881
1882         if (udc->driver->disconnect)
1883                 udc->driver->disconnect(&udc->gadget);
1884
1885         driver->unbind(&udc->gadget);
1886         udc->gadget.dev.driver = NULL;
1887
1888         clk_disable(udc->hclk);
1889         clk_disable(udc->pclk);
1890
1891         DBG(DBG_GADGET, "unregistered driver `%s'\n", udc->driver->driver.name);
1892
1893         udc->driver = NULL;
1894
1895         return 0;
1896 }
1897
1898 static int __init usba_udc_probe(struct platform_device *pdev)
1899 {
1900         struct usba_platform_data *pdata = pdev->dev.platform_data;
1901         struct resource *regs, *fifo;
1902         struct clk *pclk, *hclk;
1903         struct usba_udc *udc = &the_udc;
1904         int irq, ret, i;
1905
1906         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1907         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1908         if (!regs || !fifo || !pdata)
1909                 return -ENXIO;
1910
1911         irq = platform_get_irq(pdev, 0);
1912         if (irq < 0)
1913                 return irq;
1914
1915         pclk = clk_get(&pdev->dev, "pclk");
1916         if (IS_ERR(pclk))
1917                 return PTR_ERR(pclk);
1918         hclk = clk_get(&pdev->dev, "hclk");
1919         if (IS_ERR(hclk)) {
1920                 ret = PTR_ERR(hclk);
1921                 goto err_get_hclk;
1922         }
1923
1924         spin_lock_init(&udc->lock);
1925         udc->pdev = pdev;
1926         udc->pclk = pclk;
1927         udc->hclk = hclk;
1928         udc->vbus_pin = -ENODEV;
1929
1930         ret = -ENOMEM;
1931         udc->regs = ioremap(regs->start, resource_size(regs));
1932         if (!udc->regs) {
1933                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1934                 goto err_map_regs;
1935         }
1936         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1937                  (unsigned long)regs->start, udc->regs);
1938         udc->fifo = ioremap(fifo->start, resource_size(fifo));
1939         if (!udc->fifo) {
1940                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1941                 goto err_map_fifo;
1942         }
1943         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1944                  (unsigned long)fifo->start, udc->fifo);
1945
1946         device_initialize(&udc->gadget.dev);
1947         udc->gadget.dev.parent = &pdev->dev;
1948         udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1949
1950         platform_set_drvdata(pdev, udc);
1951
1952         /* Make sure we start from a clean slate */
1953         clk_enable(pclk);
1954         toggle_bias(0);
1955         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1956         clk_disable(pclk);
1957
1958         usba_ep = kzalloc(sizeof(struct usba_ep) * pdata->num_ep,
1959                           GFP_KERNEL);
1960         if (!usba_ep)
1961                 goto err_alloc_ep;
1962
1963         the_udc.gadget.ep0 = &usba_ep[0].ep;
1964
1965         INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1966         usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1967         usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1968         usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1969         usba_ep[0].ep.ops = &usba_ep_ops;
1970         usba_ep[0].ep.name = pdata->ep[0].name;
1971         usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
1972         usba_ep[0].udc = &the_udc;
1973         INIT_LIST_HEAD(&usba_ep[0].queue);
1974         usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
1975         usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
1976         usba_ep[0].index = pdata->ep[0].index;
1977         usba_ep[0].can_dma = pdata->ep[0].can_dma;
1978         usba_ep[0].can_isoc = pdata->ep[0].can_isoc;
1979
1980         for (i = 1; i < pdata->num_ep; i++) {
1981                 struct usba_ep *ep = &usba_ep[i];
1982
1983                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1984                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1985                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1986                 ep->ep.ops = &usba_ep_ops;
1987                 ep->ep.name = pdata->ep[i].name;
1988                 ep->ep.maxpacket = pdata->ep[i].fifo_size;
1989                 ep->udc = &the_udc;
1990                 INIT_LIST_HEAD(&ep->queue);
1991                 ep->fifo_size = pdata->ep[i].fifo_size;
1992                 ep->nr_banks = pdata->ep[i].nr_banks;
1993                 ep->index = pdata->ep[i].index;
1994                 ep->can_dma = pdata->ep[i].can_dma;
1995                 ep->can_isoc = pdata->ep[i].can_isoc;
1996
1997                 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1998         }
1999
2000         ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
2001         if (ret) {
2002                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2003                         irq, ret);
2004                 goto err_request_irq;
2005         }
2006         udc->irq = irq;
2007
2008         ret = device_add(&udc->gadget.dev);
2009         if (ret) {
2010                 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
2011                 goto err_device_add;
2012         }
2013
2014         if (gpio_is_valid(pdata->vbus_pin)) {
2015                 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
2016                         udc->vbus_pin = pdata->vbus_pin;
2017                         udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
2018
2019                         ret = request_irq(gpio_to_irq(udc->vbus_pin),
2020                                         usba_vbus_irq, 0,
2021                                         "atmel_usba_udc", udc);
2022                         if (ret) {
2023                                 gpio_free(udc->vbus_pin);
2024                                 udc->vbus_pin = -ENODEV;
2025                                 dev_warn(&udc->pdev->dev,
2026                                          "failed to request vbus irq; "
2027                                          "assuming always on\n");
2028                         } else {
2029                                 disable_irq(gpio_to_irq(udc->vbus_pin));
2030                         }
2031                 } else {
2032                         /* gpio_request fail so use -EINVAL for gpio_is_valid */
2033                         udc->vbus_pin = -EINVAL;
2034                 }
2035         }
2036
2037         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2038         if (ret)
2039                 goto err_add_udc;
2040
2041         usba_init_debugfs(udc);
2042         for (i = 1; i < pdata->num_ep; i++)
2043                 usba_ep_init_debugfs(udc, &usba_ep[i]);
2044
2045         return 0;
2046
2047 err_add_udc:
2048         if (gpio_is_valid(pdata->vbus_pin)) {
2049                 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2050                 gpio_free(udc->vbus_pin);
2051         }
2052
2053         device_unregister(&udc->gadget.dev);
2054
2055 err_device_add:
2056         free_irq(irq, udc);
2057 err_request_irq:
2058         kfree(usba_ep);
2059 err_alloc_ep:
2060         iounmap(udc->fifo);
2061 err_map_fifo:
2062         iounmap(udc->regs);
2063 err_map_regs:
2064         clk_put(hclk);
2065 err_get_hclk:
2066         clk_put(pclk);
2067
2068         platform_set_drvdata(pdev, NULL);
2069
2070         return ret;
2071 }
2072
2073 static int __exit usba_udc_remove(struct platform_device *pdev)
2074 {
2075         struct usba_udc *udc;
2076         int i;
2077         struct usba_platform_data *pdata = pdev->dev.platform_data;
2078
2079         udc = platform_get_drvdata(pdev);
2080
2081         usb_del_gadget_udc(&udc->gadget);
2082
2083         for (i = 1; i < pdata->num_ep; i++)
2084                 usba_ep_cleanup_debugfs(&usba_ep[i]);
2085         usba_cleanup_debugfs(udc);
2086
2087         if (gpio_is_valid(udc->vbus_pin)) {
2088                 free_irq(gpio_to_irq(udc->vbus_pin), udc);
2089                 gpio_free(udc->vbus_pin);
2090         }
2091
2092         free_irq(udc->irq, udc);
2093         kfree(usba_ep);
2094         iounmap(udc->fifo);
2095         iounmap(udc->regs);
2096         clk_put(udc->hclk);
2097         clk_put(udc->pclk);
2098
2099         device_unregister(&udc->gadget.dev);
2100
2101         return 0;
2102 }
2103
2104 static struct platform_driver udc_driver = {
2105         .remove         = __exit_p(usba_udc_remove),
2106         .driver         = {
2107                 .name           = "atmel_usba_udc",
2108                 .owner          = THIS_MODULE,
2109         },
2110 };
2111
2112 static int __init udc_init(void)
2113 {
2114         return platform_driver_probe(&udc_driver, usba_udc_probe);
2115 }
2116 module_init(udc_init);
2117
2118 static void __exit udc_exit(void)
2119 {
2120         platform_driver_unregister(&udc_driver);
2121 }
2122 module_exit(udc_exit);
2123
2124 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2125 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2126 MODULE_LICENSE("GPL");
2127 MODULE_ALIAS("platform:atmel_usba_udc");