git.oblomov.eu Git - linux-2.6/blob - 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/device.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/list.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/usb/ch9.h>
  20 #include <linux/usb/gadget.h>
  21 #include <linux/usb/atmel_usba_udc.h>
  22 #include <linux/delay.h>
  23
  24 #include <asm/gpio.h>
  25 #include <asm/arch/board.h>
  26
  27 #include "atmel_usba_udc.h"
  28
  29
  30 static struct usba_udc the_udc;
  31 static struct usba_ep *usba_ep;
  32
  33 #ifdef CONFIG_USB_GADGET_DEBUG_FS
  34 #include <linux/debugfs.h>
  35 #include <linux/uaccess.h>
  36
  37 static int queue_dbg_open(struct inode *inode, struct file *file)
  38 {
  39         struct usba_ep *ep = inode->i_private;
  40         struct usba_request *req, *req_copy;
  41         struct list_head *queue_data;
  42
  43         queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
  44         if (!queue_data)
  45                 return -ENOMEM;
  46         INIT_LIST_HEAD(queue_data);
  47
  48         spin_lock_irq(&ep->udc->lock);
  49         list_for_each_entry(req, &ep->queue, queue) {
  50                 req_copy = kmalloc(sizeof(*req_copy), GFP_ATOMIC);
  51                 if (!req_copy)
  52                         goto fail;
  53                 memcpy(req_copy, req, sizeof(*req_copy));
  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 = regs_resource->end - regs_resource->start + 1;
 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 (udc->vbus_pin != -1)
 323                 return gpio_get_value(udc->vbus_pin);
 324
 325         /* No Vbus detection: Assume always present */
 326         return 1;
 327 }
 328
 329 #if defined(CONFIG_AVR32)
 330
 331 static void toggle_bias(int is_on)
 332 {
 333 }
 334
 335 #elif defined(CONFIG_ARCH_AT91)
 336
 337 #include <asm/arch/at91_pmc.h>
 338
 339 static void toggle_bias(int is_on)
 340 {
 341         unsigned int uckr = at91_sys_read(AT91_CKGR_UCKR);
 342
 343         if (is_on)
 344                 at91_sys_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
 345         else
 346                 at91_sys_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
 347 }
 348
 349 #endif /* CONFIG_ARCH_AT91 */
 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 = le16_to_cpu(desc->wMaxPacketSize) & 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 ((desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) {
 554                 ep->is_in = 1;
 555                 ept_cfg |= USBA_EPT_DIR_IN;
 556         }
 557
 558         switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 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 = ((le16_to_cpu(desc->wMaxPacketSize) >> 11) & 3) + 1;
 575                 if (nr_trans > 3)
 576                         return -EINVAL;
 577
 578                 ep->is_isoc = 1;
 579                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 580
 581                 /*
 582                  * Do triple-buffering on high-bandwidth iso endpoints.
 583                  */
 584                 if (nr_trans > 1 && ep->nr_banks == 3)
 585                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
 586                 else
 587                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 588                 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 589                 break;
 590         case USB_ENDPOINT_XFER_BULK:
 591                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 592                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 593                 break;
 594         case USB_ENDPOINT_XFER_INT:
 595                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 596                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 597                 break;
 598         }
 599
 600         spin_lock_irqsave(&ep->udc->lock, flags);
 601
 602         if (ep->desc) {
 603                 spin_unlock_irqrestore(&ep->udc->lock, flags);
 604                 DBG(DBG_ERR, "ep%d already enabled\n", ep->index);
 605                 return -EBUSY;
 606         }
 607
 608         ep->desc = desc;
 609         ep->ep.maxpacket = maxpacket;
 610
 611         usba_ep_writel(ep, CFG, ept_cfg);
 612         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 613
 614         if (ep->can_dma) {
 615                 u32 ctrl;
 616
 617                 usba_writel(udc, INT_ENB,
 618                                 (usba_readl(udc, INT_ENB)
 619                                         | USBA_BF(EPT_INT, 1 << ep->index)
 620                                         | USBA_BF(DMA_INT, 1 << ep->index)));
 621                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 622                 usba_ep_writel(ep, CTL_ENB, ctrl);
 623         } else {
 624                 usba_writel(udc, INT_ENB,
 625                                 (usba_readl(udc, INT_ENB)
 626                                         | USBA_BF(EPT_INT, 1 << ep->index)));
 627         }
 628
 629         spin_unlock_irqrestore(&udc->lock, flags);
 630
 631         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 632                         (unsigned long)usba_ep_readl(ep, CFG));
 633         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 634                         (unsigned long)usba_readl(udc, INT_ENB));
 635
 636         return 0;
 637 }
 638
 639 static int usba_ep_disable(struct usb_ep *_ep)
 640 {
 641         struct usba_ep *ep = to_usba_ep(_ep);
 642         struct usba_udc *udc = ep->udc;
 643         LIST_HEAD(req_list);
 644         unsigned long flags;
 645
 646         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 647
 648         spin_lock_irqsave(&udc->lock, flags);
 649
 650         if (!ep->desc) {
 651                 spin_unlock_irqrestore(&udc->lock, flags);
 652                 /* REVISIT because this driver disables endpoints in
 653                  * reset_all_endpoints() before calling disconnect(),
 654                  * most gadget drivers would trigger this non-error ...
 655                  */
 656                 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
 657                         DBG(DBG_ERR, "ep_disable: %s not enabled\n",
 658                                         ep->ep.name);
 659                 return -EINVAL;
 660         }
 661         ep->desc = NULL;
 662
 663         list_splice_init(&ep->queue, &req_list);
 664         if (ep->can_dma) {
 665                 usba_dma_writel(ep, CONTROL, 0);
 666                 usba_dma_writel(ep, ADDRESS, 0);
 667                 usba_dma_readl(ep, STATUS);
 668         }
 669         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 670         usba_writel(udc, INT_ENB,
 671                         usba_readl(udc, INT_ENB)
 672                         & ~USBA_BF(EPT_INT, 1 << ep->index));
 673
 674         request_complete_list(ep, &req_list, -ESHUTDOWN);
 675
 676         spin_unlock_irqrestore(&udc->lock, flags);
 677
 678         return 0;
 679 }
 680
 681 static struct usb_request *
 682 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 683 {
 684         struct usba_request *req;
 685
 686         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 687
 688         req = kzalloc(sizeof(*req), gfp_flags);
 689         if (!req)
 690                 return NULL;
 691
 692         INIT_LIST_HEAD(&req->queue);
 693         req->req.dma = DMA_ADDR_INVALID;
 694
 695         return &req->req;
 696 }
 697
 698 static void
 699 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 700 {
 701         struct usba_request *req = to_usba_req(_req);
 702
 703         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 704
 705         kfree(req);
 706 }
 707
 708 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 709                 struct usba_request *req, gfp_t gfp_flags)
 710 {
 711         unsigned long flags;
 712         int ret;
 713
 714         DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
 715                 ep->ep.name, req->req.length, req->req.dma,
 716                 req->req.zero ? 'Z' : 'z',
 717                 req->req.short_not_ok ? 'S' : 's',
 718                 req->req.no_interrupt ? 'I' : 'i');
 719
 720         if (req->req.length > 0x10000) {
 721                 /* Lengths from 0 to 65536 (inclusive) are supported */
 722                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 723                 return -EINVAL;
 724         }
 725
 726         req->using_dma = 1;
 727
 728         if (req->req.dma == DMA_ADDR_INVALID) {
 729                 req->req.dma = dma_map_single(
 730                         &udc->pdev->dev, req->req.buf, req->req.length,
 731                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 732                 req->mapped = 1;
 733         } else {
 734                 dma_sync_single_for_device(
 735                         &udc->pdev->dev, req->req.dma, req->req.length,
 736                         ep->is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 737                 req->mapped = 0;
 738         }
 739
 740         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 741                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 742                         | USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 743
 744         if (ep->is_in)
 745                 req->ctrl |= USBA_DMA_END_BUF_EN;
 746
 747         /*
 748          * Add this request to the queue and submit for DMA if
 749          * possible. Check if we're still alive first -- we may have
 750          * received a reset since last time we checked.
 751          */
 752         ret = -ESHUTDOWN;
 753         spin_lock_irqsave(&udc->lock, flags);
 754         if (ep->desc) {
 755                 if (list_empty(&ep->queue))
 756                         submit_request(ep, req);
 757
 758                 list_add_tail(&req->queue, &ep->queue);
 759                 ret = 0;
 760         }
 761         spin_unlock_irqrestore(&udc->lock, flags);
 762
 763         return ret;
 764 }
 765
 766 static int
 767 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 768 {
 769         struct usba_request *req = to_usba_req(_req);
 770         struct usba_ep *ep = to_usba_ep(_ep);
 771         struct usba_udc *udc = ep->udc;
 772         unsigned long flags;
 773         int ret;
 774
 775         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 776                         ep->ep.name, req, _req->length);
 777
 778         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN || !ep->desc)
 779                 return -ESHUTDOWN;
 780
 781         req->submitted = 0;
 782         req->using_dma = 0;
 783         req->last_transaction = 0;
 784
 785         _req->status = -EINPROGRESS;
 786         _req->actual = 0;
 787
 788         if (ep->can_dma)
 789                 return queue_dma(udc, ep, req, gfp_flags);
 790
 791         /* May have received a reset since last time we checked */
 792         ret = -ESHUTDOWN;
 793         spin_lock_irqsave(&udc->lock, flags);
 794         if (ep->desc) {
 795                 list_add_tail(&req->queue, &ep->queue);
 796
 797                 if (ep->is_in || (ep_is_control(ep)
 798                                 && (ep->state == DATA_STAGE_IN
 799                                         || ep->state == STATUS_STAGE_IN)))
 800                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 801                 else
 802                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 803                 ret = 0;
 804         }
 805         spin_unlock_irqrestore(&udc->lock, flags);
 806
 807         return ret;
 808 }
 809
 810 static void
 811 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 812 {
 813         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 814 }
 815
 816 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 817 {
 818         unsigned int timeout;
 819         u32 status;
 820
 821         /*
 822          * Stop the DMA controller. When writing both CH_EN
 823          * and LINK to 0, the other bits are not affected.
 824          */
 825         usba_dma_writel(ep, CONTROL, 0);
 826
 827         /* Wait for the FIFO to empty */
 828         for (timeout = 40; timeout; --timeout) {
 829                 status = usba_dma_readl(ep, STATUS);
 830                 if (!(status & USBA_DMA_CH_EN))
 831                         break;
 832                 udelay(1);
 833         }
 834
 835         if (pstatus)
 836                 *pstatus = status;
 837
 838         if (timeout == 0) {
 839                 dev_err(&ep->udc->pdev->dev,
 840                         "%s: timed out waiting for DMA FIFO to empty\n",
 841                         ep->ep.name);
 842                 return -ETIMEDOUT;
 843         }
 844
 845         return 0;
 846 }
 847
 848 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 849 {
 850         struct usba_ep *ep = to_usba_ep(_ep);
 851         struct usba_udc *udc = ep->udc;
 852         struct usba_request *req = to_usba_req(_req);
 853         unsigned long flags;
 854         u32 status;
 855
 856         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 857                         ep->ep.name, req);
 858
 859         spin_lock_irqsave(&udc->lock, flags);
 860
 861         if (req->using_dma) {
 862                 /*
 863                  * If this request is currently being transferred,
 864                  * stop the DMA controller and reset the FIFO.
 865                  */
 866                 if (ep->queue.next == &req->queue) {
 867                         status = usba_dma_readl(ep, STATUS);
 868                         if (status & USBA_DMA_CH_EN)
 869                                 stop_dma(ep, &status);
 870
 871 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 872                         ep->last_dma_status = status;
 873 #endif
 874
 875                         usba_writel(udc, EPT_RST, 1 << ep->index);
 876
 877                         usba_update_req(ep, req, status);
 878                 }
 879         }
 880
 881         /*
 882          * Errors should stop the queue from advancing until the
 883          * completion function returns.
 884          */
 885         list_del_init(&req->queue);
 886
 887         request_complete(ep, req, -ECONNRESET);
 888
 889         /* Process the next request if any */
 890         submit_next_request(ep);
 891         spin_unlock_irqrestore(&udc->lock, flags);
 892
 893         return 0;
 894 }
 895
 896 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 897 {
 898         struct usba_ep *ep = to_usba_ep(_ep);
 899         struct usba_udc *udc = ep->udc;
 900         unsigned long flags;
 901         int ret = 0;
 902
 903         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 904                         value ? "set" : "clear");
 905
 906         if (!ep->desc) {
 907                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 908                                 ep->ep.name);
 909                 return -ENODEV;
 910         }
 911         if (ep->is_isoc) {
 912                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 913                                 ep->ep.name);
 914                 return -ENOTTY;
 915         }
 916
 917         spin_lock_irqsave(&udc->lock, flags);
 918
 919         /*
 920          * We can't halt IN endpoints while there are still data to be
 921          * transferred
 922          */
 923         if (!list_empty(&ep->queue)
 924                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 925                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 926                 ret = -EAGAIN;
 927         } else {
 928                 if (value)
 929                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 930                 else
 931                         usba_ep_writel(ep, CLR_STA,
 932                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 933                 usba_ep_readl(ep, STA);
 934         }
 935
 936         spin_unlock_irqrestore(&udc->lock, flags);
 937
 938         return ret;
 939 }
 940
 941 static int usba_ep_fifo_status(struct usb_ep *_ep)
 942 {
 943         struct usba_ep *ep = to_usba_ep(_ep);
 944
 945         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 946 }
 947
 948 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 949 {
 950         struct usba_ep *ep = to_usba_ep(_ep);
 951         struct usba_udc *udc = ep->udc;
 952
 953         usba_writel(udc, EPT_RST, 1 << ep->index);
 954 }
 955
 956 static const struct usb_ep_ops usba_ep_ops = {
 957         .enable         = usba_ep_enable,
 958         .disable        = usba_ep_disable,
 959         .alloc_request  = usba_ep_alloc_request,
 960         .free_request   = usba_ep_free_request,
 961         .queue          = usba_ep_queue,
 962         .dequeue        = usba_ep_dequeue,
 963         .set_halt       = usba_ep_set_halt,
 964         .fifo_status    = usba_ep_fifo_status,
 965         .fifo_flush     = usba_ep_fifo_flush,
 966 };
 967
 968 static int usba_udc_get_frame(struct usb_gadget *gadget)
 969 {
 970         struct usba_udc *udc = to_usba_udc(gadget);
 971
 972         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 973 }
 974
 975 static int usba_udc_wakeup(struct usb_gadget *gadget)
 976 {
 977         struct usba_udc *udc = to_usba_udc(gadget);
 978         unsigned long flags;
 979         u32 ctrl;
 980         int ret = -EINVAL;
 981
 982         spin_lock_irqsave(&udc->lock, flags);
 983         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 984                 ctrl = usba_readl(udc, CTRL);
 985                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 986                 ret = 0;
 987         }
 988         spin_unlock_irqrestore(&udc->lock, flags);
 989
 990         return ret;
 991 }
 992
 993 static int
 994 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 995 {
 996         struct usba_udc *udc = to_usba_udc(gadget);
 997         unsigned long flags;
 998
 999         spin_lock_irqsave(&udc->lock, flags);
1000         if (is_selfpowered)
1001                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1002         else
1003                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1004         spin_unlock_irqrestore(&udc->lock, flags);
1005
1006         return 0;
1007 }
1008
1009 static const struct usb_gadget_ops usba_udc_ops = {
1010         .get_frame              = usba_udc_get_frame,
1011         .wakeup                 = usba_udc_wakeup,
1012         .set_selfpowered        = usba_udc_set_selfpowered,
1013 };
1014
1015 static struct usb_endpoint_descriptor usba_ep0_desc = {
1016         .bLength = USB_DT_ENDPOINT_SIZE,
1017         .bDescriptorType = USB_DT_ENDPOINT,
1018         .bEndpointAddress = 0,
1019         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1020         .wMaxPacketSize = __constant_cpu_to_le16(64),
1021         /* FIXME: I have no idea what to put here */
1022         .bInterval = 1,
1023 };
1024
1025 static void nop_release(struct device *dev)
1026 {
1027
1028 }
1029
1030 static struct usba_udc the_udc = {
1031         .gadget = {
1032                 .ops            = &usba_udc_ops,
1033                 .ep_list        = LIST_HEAD_INIT(the_udc.gadget.ep_list),
1034                 .is_dualspeed   = 1,
1035                 .name           = "atmel_usba_udc",
1036                 .dev    = {
1037                         .bus_id         = "gadget",
1038                         .release        = nop_release,
1039                 },
1040         },
1041 };
1042
1043 /*
1044  * Called with interrupts disabled and udc->lock held.
1045  */
1046 static void reset_all_endpoints(struct usba_udc *udc)
1047 {
1048         struct usba_ep *ep;
1049         struct usba_request *req, *tmp_req;
1050
1051         usba_writel(udc, EPT_RST, ~0UL);
1052
1053         ep = to_usba_ep(udc->gadget.ep0);
1054         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1055                 list_del_init(&req->queue);
1056                 request_complete(ep, req, -ECONNRESET);
1057         }
1058
1059         /* NOTE:  normally, the next call to the gadget driver is in
1060          * charge of disabling endpoints... usually disconnect().
1061          * The exception would be entering a high speed test mode.
1062          *
1063          * FIXME remove this code ... and retest thoroughly.
1064          */
1065         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1066                 if (ep->desc) {
1067                         spin_unlock(&udc->lock);
1068                         usba_ep_disable(&ep->ep);
1069                         spin_lock(&udc->lock);
1070                 }
1071         }
1072 }
1073
1074 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1075 {
1076         struct usba_ep *ep;
1077
1078         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1079                 return to_usba_ep(udc->gadget.ep0);
1080
1081         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1082                 u8 bEndpointAddress;
1083
1084                 if (!ep->desc)
1085                         continue;
1086                 bEndpointAddress = ep->desc->bEndpointAddress;
1087                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1088                         continue;
1089                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1090                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1091                         return ep;
1092         }
1093
1094         return NULL;
1095 }
1096
1097 /* Called with interrupts disabled and udc->lock held */
1098 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1099 {
1100         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1101         ep->state = WAIT_FOR_SETUP;
1102 }
1103
1104 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1105 {
1106         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1107                 return 1;
1108         return 0;
1109 }
1110
1111 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1112 {
1113         u32 regval;
1114
1115         DBG(DBG_BUS, "setting address %u...\n", addr);
1116         regval = usba_readl(udc, CTRL);
1117         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1118         usba_writel(udc, CTRL, regval);
1119 }
1120
1121 static int do_test_mode(struct usba_udc *udc)
1122 {
1123         static const char test_packet_buffer[] = {
1124                 /* JKJKJKJK * 9 */
1125                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1126                 /* JJKKJJKK * 8 */
1127                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1128                 /* JJKKJJKK * 8 */
1129                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1130                 /* JJJJJJJKKKKKKK * 8 */
1131                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1132                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1133                 /* JJJJJJJK * 8 */
1134                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1135                 /* {JKKKKKKK * 10}, JK */
1136                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1137         };
1138         struct usba_ep *ep;
1139         struct device *dev = &udc->pdev->dev;
1140         int test_mode;
1141
1142         test_mode = udc->test_mode;
1143
1144         /* Start from a clean slate */
1145         reset_all_endpoints(udc);
1146
1147         switch (test_mode) {
1148         case 0x0100:
1149                 /* Test_J */
1150                 usba_writel(udc, TST, USBA_TST_J_MODE);
1151                 dev_info(dev, "Entering Test_J mode...\n");
1152                 break;
1153         case 0x0200:
1154                 /* Test_K */
1155                 usba_writel(udc, TST, USBA_TST_K_MODE);
1156                 dev_info(dev, "Entering Test_K mode...\n");
1157                 break;
1158         case 0x0300:
1159                 /*
1160                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1161                  * for Bulk IN transfers
1162                  */
1163                 ep = &usba_ep[0];
1164                 usba_writel(udc, TST,
1165                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1166                 usba_ep_writel(ep, CFG,
1167                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1168                                 | USBA_EPT_DIR_IN
1169                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1170                                 | USBA_BF(BK_NUMBER, 1));
1171                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1172                         set_protocol_stall(udc, ep);
1173                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1174                 } else {
1175                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1176                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1177                 }
1178                 break;
1179         case 0x0400:
1180                 /* Test_Packet */
1181                 ep = &usba_ep[0];
1182                 usba_ep_writel(ep, CFG,
1183                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1184                                 | USBA_EPT_DIR_IN
1185                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1186                                 | USBA_BF(BK_NUMBER, 1));
1187                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1188                         set_protocol_stall(udc, ep);
1189                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1190                 } else {
1191                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1192                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1193                         memcpy_toio(ep->fifo, test_packet_buffer,
1194                                         sizeof(test_packet_buffer));
1195                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1196                         dev_info(dev, "Entering Test_Packet mode...\n");
1197                 }
1198                 break;
1199         default:
1200                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1201                 return -EINVAL;
1202         }
1203
1204         return 0;
1205 }
1206
1207 /* Avoid overly long expressions */
1208 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1209 {
1210         if (crq->wValue == __constant_cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1211                 return true;
1212         return false;
1213 }
1214
1215 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1216 {
1217         if (crq->wValue == __constant_cpu_to_le16(USB_DEVICE_TEST_MODE))
1218                 return true;
1219         return false;
1220 }
1221
1222 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1223 {
1224         if (crq->wValue == __constant_cpu_to_le16(USB_ENDPOINT_HALT))
1225                 return true;
1226         return false;
1227 }
1228
1229 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1230                 struct usb_ctrlrequest *crq)
1231 {
1232         int retval = 0;
1233
1234         switch (crq->bRequest) {
1235         case USB_REQ_GET_STATUS: {
1236                 u16 status;
1237
1238                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1239                         status = cpu_to_le16(udc->devstatus);
1240                 } else if (crq->bRequestType
1241                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1242                         status = __constant_cpu_to_le16(0);
1243                 } else if (crq->bRequestType
1244                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1245                         struct usba_ep *target;
1246
1247                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1248                         if (!target)
1249                                 goto stall;
1250
1251                         status = 0;
1252                         if (is_stalled(udc, target))
1253                                 status |= __constant_cpu_to_le16(1);
1254                 } else
1255                         goto delegate;
1256
1257                 /* Write directly to the FIFO. No queueing is done. */
1258                 if (crq->wLength != __constant_cpu_to_le16(sizeof(status)))
1259                         goto stall;
1260                 ep->state = DATA_STAGE_IN;
1261                 __raw_writew(status, ep->fifo);
1262                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1263                 break;
1264         }
1265
1266         case USB_REQ_CLEAR_FEATURE: {
1267                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1268                         if (feature_is_dev_remote_wakeup(crq))
1269                                 udc->devstatus
1270                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1271                         else
1272                                 /* Can't CLEAR_FEATURE TEST_MODE */
1273                                 goto stall;
1274                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1275                         struct usba_ep *target;
1276
1277                         if (crq->wLength != __constant_cpu_to_le16(0)
1278                                         || !feature_is_ep_halt(crq))
1279                                 goto stall;
1280                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1281                         if (!target)
1282                                 goto stall;
1283
1284                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1285                         if (target->index != 0)
1286                                 usba_ep_writel(target, CLR_STA,
1287                                                 USBA_TOGGLE_CLR);
1288                 } else {
1289                         goto delegate;
1290                 }
1291
1292                 send_status(udc, ep);
1293                 break;
1294         }
1295
1296         case USB_REQ_SET_FEATURE: {
1297                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1298                         if (feature_is_dev_test_mode(crq)) {
1299                                 send_status(udc, ep);
1300                                 ep->state = STATUS_STAGE_TEST;
1301                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1302                                 return 0;
1303                         } else if (feature_is_dev_remote_wakeup(crq)) {
1304                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1305                         } else {
1306                                 goto stall;
1307                         }
1308                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1309                         struct usba_ep *target;
1310
1311                         if (crq->wLength != __constant_cpu_to_le16(0)
1312                                         || !feature_is_ep_halt(crq))
1313                                 goto stall;
1314
1315                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1316                         if (!target)
1317                                 goto stall;
1318
1319                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1320                 } else
1321                         goto delegate;
1322
1323                 send_status(udc, ep);
1324                 break;
1325         }
1326
1327         case USB_REQ_SET_ADDRESS:
1328                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1329                         goto delegate;
1330
1331                 set_address(udc, le16_to_cpu(crq->wValue));
1332                 send_status(udc, ep);
1333                 ep->state = STATUS_STAGE_ADDR;
1334                 break;
1335
1336         default:
1337 delegate:
1338                 spin_unlock(&udc->lock);
1339                 retval = udc->driver->setup(&udc->gadget, crq);
1340                 spin_lock(&udc->lock);
1341         }
1342
1343         return retval;
1344
1345 stall:
1346         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1347                 "halting endpoint...\n",
1348                 ep->ep.name, crq->bRequestType, crq->bRequest,
1349                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1350                 le16_to_cpu(crq->wLength));
1351         set_protocol_stall(udc, ep);
1352         return -1;
1353 }
1354
1355 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1356 {
1357         struct usba_request *req;
1358         u32 epstatus;
1359         u32 epctrl;
1360
1361 restart:
1362         epstatus = usba_ep_readl(ep, STA);
1363         epctrl = usba_ep_readl(ep, CTL);
1364
1365         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1366                         ep->ep.name, ep->state, epstatus, epctrl);
1367
1368         req = NULL;
1369         if (!list_empty(&ep->queue))
1370                 req = list_entry(ep->queue.next,
1371                                  struct usba_request, queue);
1372
1373         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1374                 if (req->submitted)
1375                         next_fifo_transaction(ep, req);
1376                 else
1377                         submit_request(ep, req);
1378
1379                 if (req->last_transaction) {
1380                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1381                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1382                 }
1383                 goto restart;
1384         }
1385         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1386                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1387
1388                 switch (ep->state) {
1389                 case DATA_STAGE_IN:
1390                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1391                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1392                         ep->state = STATUS_STAGE_OUT;
1393                         break;
1394                 case STATUS_STAGE_ADDR:
1395                         /* Activate our new address */
1396                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1397                                                 | USBA_FADDR_EN));
1398                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1399                         ep->state = WAIT_FOR_SETUP;
1400                         break;
1401                 case STATUS_STAGE_IN:
1402                         if (req) {
1403                                 list_del_init(&req->queue);
1404                                 request_complete(ep, req, 0);
1405                                 submit_next_request(ep);
1406                         }
1407                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1408                         ep->state = WAIT_FOR_SETUP;
1409                         break;
1410                 case STATUS_STAGE_TEST:
1411                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1412                         ep->state = WAIT_FOR_SETUP;
1413                         if (do_test_mode(udc))
1414                                 set_protocol_stall(udc, ep);
1415                         break;
1416                 default:
1417                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1418                                 "halting endpoint...\n",
1419                                 ep->ep.name, ep->state);
1420                         set_protocol_stall(udc, ep);
1421                         break;
1422                 }
1423
1424                 goto restart;
1425         }
1426         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1427                 switch (ep->state) {
1428                 case STATUS_STAGE_OUT:
1429                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1430                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1431
1432                         if (req) {
1433                                 list_del_init(&req->queue);
1434                                 request_complete(ep, req, 0);
1435                         }
1436                         ep->state = WAIT_FOR_SETUP;
1437                         break;
1438
1439                 case DATA_STAGE_OUT:
1440                         receive_data(ep);
1441                         break;
1442
1443                 default:
1444                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1445                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1446                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1447                                 "halting endpoint...\n",
1448                                 ep->ep.name, ep->state);
1449                         set_protocol_stall(udc, ep);
1450                         break;
1451                 }
1452
1453                 goto restart;
1454         }
1455         if (epstatus & USBA_RX_SETUP) {
1456                 union {
1457                         struct usb_ctrlrequest crq;
1458                         unsigned long data[2];
1459                 } crq;
1460                 unsigned int pkt_len;
1461                 int ret;
1462
1463                 if (ep->state != WAIT_FOR_SETUP) {
1464                         /*
1465                          * Didn't expect a SETUP packet at this
1466                          * point. Clean up any pending requests (which
1467                          * may be successful).
1468                          */
1469                         int status = -EPROTO;
1470
1471                         /*
1472                          * RXRDY and TXCOMP are dropped when SETUP
1473                          * packets arrive.  Just pretend we received
1474                          * the status packet.
1475                          */
1476                         if (ep->state == STATUS_STAGE_OUT
1477                                         || ep->state == STATUS_STAGE_IN) {
1478                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1479                                 status = 0;
1480                         }
1481
1482                         if (req) {
1483                                 list_del_init(&req->queue);
1484                                 request_complete(ep, req, status);
1485                         }
1486                 }
1487
1488                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1489                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1490                 if (pkt_len != sizeof(crq)) {
1491                         pr_warning("udc: Invalid packet length %u "
1492                                 "(expected %zu)\n", pkt_len, sizeof(crq));
1493                         set_protocol_stall(udc, ep);
1494                         return;
1495                 }
1496
1497                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1498                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1499
1500                 /* Free up one bank in the FIFO so that we can
1501                  * generate or receive a reply right away. */
1502                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1503
1504                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1505                         ep->state, crq.crq.bRequestType,
1506                         crq.crq.bRequest); */
1507
1508                 if (crq.crq.bRequestType & USB_DIR_IN) {
1509                         /*
1510                          * The USB 2.0 spec states that "if wLength is
1511                          * zero, there is no data transfer phase."
1512                          * However, testusb #14 seems to actually
1513                          * expect a data phase even if wLength = 0...
1514                          */
1515                         ep->state = DATA_STAGE_IN;
1516                 } else {
1517                         if (crq.crq.wLength != __constant_cpu_to_le16(0))
1518                                 ep->state = DATA_STAGE_OUT;
1519                         else
1520                                 ep->state = STATUS_STAGE_IN;
1521                 }
1522
1523                 ret = -1;
1524                 if (ep->index == 0)
1525                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1526                 else {
1527                         spin_unlock(&udc->lock);
1528                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1529                         spin_lock(&udc->lock);
1530                 }
1531
1532                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1533                         crq.crq.bRequestType, crq.crq.bRequest,
1534                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1535
1536                 if (ret < 0) {
1537                         /* Let the host know that we failed */
1538                         set_protocol_stall(udc, ep);
1539                 }
1540         }
1541 }
1542
1543 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1544 {
1545         struct usba_request *req;
1546         u32 epstatus;
1547         u32 epctrl;
1548
1549         epstatus = usba_ep_readl(ep, STA);
1550         epctrl = usba_ep_readl(ep, CTL);
1551
1552         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1553
1554         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1555                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1556
1557                 if (list_empty(&ep->queue)) {
1558                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1559                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1560                         return;
1561                 }
1562
1563                 req = list_entry(ep->queue.next, struct usba_request, queue);
1564
1565                 if (req->using_dma) {
1566                         /* Send a zero-length packet */
1567                         usba_ep_writel(ep, SET_STA,
1568                                         USBA_TX_PK_RDY);
1569                         usba_ep_writel(ep, CTL_DIS,
1570                                         USBA_TX_PK_RDY);
1571                         list_del_init(&req->queue);
1572                         submit_next_request(ep);
1573                         request_complete(ep, req, 0);
1574                 } else {
1575                         if (req->submitted)
1576                                 next_fifo_transaction(ep, req);
1577                         else
1578                                 submit_request(ep, req);
1579
1580                         if (req->last_transaction) {
1581                                 list_del_init(&req->queue);
1582                                 submit_next_request(ep);
1583                                 request_complete(ep, req, 0);
1584                         }
1585                 }
1586
1587                 epstatus = usba_ep_readl(ep, STA);
1588                 epctrl = usba_ep_readl(ep, CTL);
1589         }
1590         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1591                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1592                 receive_data(ep);
1593                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1594         }
1595 }
1596
1597 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1598 {
1599         struct usba_request *req;
1600         u32 status, control, pending;
1601
1602         status = usba_dma_readl(ep, STATUS);
1603         control = usba_dma_readl(ep, CONTROL);
1604 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1605         ep->last_dma_status = status;
1606 #endif
1607         pending = status & control;
1608         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1609
1610         if (status & USBA_DMA_CH_EN) {
1611                 dev_err(&udc->pdev->dev,
1612                         "DMA_CH_EN is set after transfer is finished!\n");
1613                 dev_err(&udc->pdev->dev,
1614                         "status=%#08x, pending=%#08x, control=%#08x\n",
1615                         status, pending, control);
1616
1617                 /*
1618                  * try to pretend nothing happened. We might have to
1619                  * do something here...
1620                  */
1621         }
1622
1623         if (list_empty(&ep->queue))
1624                 /* Might happen if a reset comes along at the right moment */
1625                 return;
1626
1627         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1628                 req = list_entry(ep->queue.next, struct usba_request, queue);
1629                 usba_update_req(ep, req, status);
1630
1631                 list_del_init(&req->queue);
1632                 submit_next_request(ep);
1633                 request_complete(ep, req, 0);
1634         }
1635 }
1636
1637 static irqreturn_t usba_udc_irq(int irq, void *devid)
1638 {
1639         struct usba_udc *udc = devid;
1640         u32 status;
1641         u32 dma_status;
1642         u32 ep_status;
1643
1644         spin_lock(&udc->lock);
1645
1646         status = usba_readl(udc, INT_STA);
1647         DBG(DBG_INT, "irq, status=%#08x\n", status);
1648
1649         if (status & USBA_DET_SUSPEND) {
1650                 toggle_bias(0);
1651                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1652                 DBG(DBG_BUS, "Suspend detected\n");
1653                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1654                                 && udc->driver && udc->driver->suspend) {
1655                         spin_unlock(&udc->lock);
1656                         udc->driver->suspend(&udc->gadget);
1657                         spin_lock(&udc->lock);
1658                 }
1659         }
1660
1661         if (status & USBA_WAKE_UP) {
1662                 toggle_bias(1);
1663                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1664                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1665         }
1666
1667         if (status & USBA_END_OF_RESUME) {
1668                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1669                 DBG(DBG_BUS, "Resume detected\n");
1670                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1671                                 && udc->driver && udc->driver->resume) {
1672                         spin_unlock(&udc->lock);
1673                         udc->driver->resume(&udc->gadget);
1674                         spin_lock(&udc->lock);
1675                 }
1676         }
1677
1678         dma_status = USBA_BFEXT(DMA_INT, status);
1679         if (dma_status) {
1680                 int i;
1681
1682                 for (i = 1; i < USBA_NR_ENDPOINTS; i++)
1683                         if (dma_status & (1 << i))
1684                                 usba_dma_irq(udc, &usba_ep[i]);
1685         }
1686
1687         ep_status = USBA_BFEXT(EPT_INT, status);
1688         if (ep_status) {
1689                 int i;
1690
1691                 for (i = 0; i < USBA_NR_ENDPOINTS; i++)
1692                         if (ep_status & (1 << i)) {
1693                                 if (ep_is_control(&usba_ep[i]))
1694                                         usba_control_irq(udc, &usba_ep[i]);
1695                                 else
1696                                         usba_ep_irq(udc, &usba_ep[i]);
1697                         }
1698         }
1699
1700         if (status & USBA_END_OF_RESET) {
1701                 struct usba_ep *ep0;
1702
1703                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1704                 reset_all_endpoints(udc);
1705
1706                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1707                                 && udc->driver->disconnect) {
1708                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1709                         spin_unlock(&udc->lock);
1710                         udc->driver->disconnect(&udc->gadget);
1711                         spin_lock(&udc->lock);
1712                 }
1713
1714                 if (status & USBA_HIGH_SPEED) {
1715                         DBG(DBG_BUS, "High-speed bus reset detected\n");
1716                         udc->gadget.speed = USB_SPEED_HIGH;
1717                 } else {
1718                         DBG(DBG_BUS, "Full-speed bus reset detected\n");
1719                         udc->gadget.speed = USB_SPEED_FULL;
1720                 }
1721
1722                 ep0 = &usba_ep[0];
1723                 ep0->desc = &usba_ep0_desc;
1724                 ep0->state = WAIT_FOR_SETUP;
1725                 usba_ep_writel(ep0, CFG,
1726                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1727                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1728                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1729                 usba_ep_writel(ep0, CTL_ENB,
1730                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1731                 usba_writel(udc, INT_ENB,
1732                                 (usba_readl(udc, INT_ENB)
1733                                 | USBA_BF(EPT_INT, 1)
1734                                 | USBA_DET_SUSPEND
1735                                 | USBA_END_OF_RESUME));
1736
1737                 /*
1738                  * Unclear why we hit this irregularly, e.g. in usbtest,
1739                  * but it's clearly harmless...
1740                  */
1741                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1742                         dev_dbg(&udc->pdev->dev,
1743                                  "ODD: EP0 configuration is invalid!\n");
1744         }
1745
1746         spin_unlock(&udc->lock);
1747
1748         return IRQ_HANDLED;
1749 }
1750
1751 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1752 {
1753         struct usba_udc *udc = devid;
1754         int vbus;
1755
1756         /* debounce */
1757         udelay(10);
1758
1759         spin_lock(&udc->lock);
1760
1761         /* May happen if Vbus pin toggles during probe() */
1762         if (!udc->driver)
1763                 goto out;
1764
1765         vbus = gpio_get_value(udc->vbus_pin);
1766         if (vbus != udc->vbus_prev) {
1767                 if (vbus) {
1768                         toggle_bias(1);
1769                         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1770                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1771                 } else {
1772                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1773                         reset_all_endpoints(udc);
1774                         toggle_bias(0);
1775                         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1776                         if (udc->driver->disconnect) {
1777                                 spin_unlock(&udc->lock);
1778                                 udc->driver->disconnect(&udc->gadget);
1779                                 spin_lock(&udc->lock);
1780                         }
1781                 }
1782                 udc->vbus_prev = vbus;
1783         }
1784
1785 out:
1786         spin_unlock(&udc->lock);
1787
1788         return IRQ_HANDLED;
1789 }
1790
1791 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1792 {
1793         struct usba_udc *udc = &the_udc;
1794         unsigned long flags;
1795         int ret;
1796
1797         if (!udc->pdev)
1798                 return -ENODEV;
1799
1800         spin_lock_irqsave(&udc->lock, flags);
1801         if (udc->driver) {
1802                 spin_unlock_irqrestore(&udc->lock, flags);
1803                 return -EBUSY;
1804         }
1805
1806         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1807         udc->driver = driver;
1808         udc->gadget.dev.driver = &driver->driver;
1809         spin_unlock_irqrestore(&udc->lock, flags);
1810
1811         clk_enable(udc->pclk);
1812         clk_enable(udc->hclk);
1813
1814         ret = driver->bind(&udc->gadget);
1815         if (ret) {
1816                 DBG(DBG_ERR, "Could not bind to driver %s: error %d\n",
1817                         driver->driver.name, ret);
1818                 goto err_driver_bind;
1819         }
1820
1821         DBG(DBG_GADGET, "registered driver `%s'\n", driver->driver.name);
1822
1823         udc->vbus_prev = 0;
1824         if (udc->vbus_pin != -1)
1825                 enable_irq(gpio_to_irq(udc->vbus_pin));
1826
1827         /* If Vbus is present, enable the controller and wait for reset */
1828         spin_lock_irqsave(&udc->lock, flags);
1829         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1830                 toggle_bias(1);
1831                 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1832                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1833         }
1834         spin_unlock_irqrestore(&udc->lock, flags);
1835
1836         return 0;
1837
1838 err_driver_bind:
1839         udc->driver = NULL;
1840         udc->gadget.dev.driver = NULL;
1841         return ret;
1842 }
1843 EXPORT_SYMBOL(usb_gadget_register_driver);
1844
1845 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
1846 {
1847         struct usba_udc *udc = &the_udc;
1848         unsigned long flags;
1849
1850         if (!udc->pdev)
1851                 return -ENODEV;
1852         if (driver != udc->driver || !driver->unbind)
1853                 return -EINVAL;
1854
1855         if (udc->vbus_pin != -1)
1856                 disable_irq(gpio_to_irq(udc->vbus_pin));
1857
1858         spin_lock_irqsave(&udc->lock, flags);
1859         udc->gadget.speed = USB_SPEED_UNKNOWN;
1860         reset_all_endpoints(udc);
1861         spin_unlock_irqrestore(&udc->lock, flags);
1862
1863         /* This will also disable the DP pullup */
1864         toggle_bias(0);
1865         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1866
1867         if (udc->driver->disconnect)
1868                 udc->driver->disconnect(&udc->gadget);
1869
1870         driver->unbind(&udc->gadget);
1871         udc->gadget.dev.driver = NULL;
1872         udc->driver = NULL;
1873
1874         clk_disable(udc->hclk);
1875         clk_disable(udc->pclk);
1876
1877         DBG(DBG_GADGET, "unregistered driver `%s'\n", driver->driver.name);
1878
1879         return 0;
1880 }
1881 EXPORT_SYMBOL(usb_gadget_unregister_driver);
1882
1883 static int __init usba_udc_probe(struct platform_device *pdev)
1884 {
1885         struct usba_platform_data *pdata = pdev->dev.platform_data;
1886         struct resource *regs, *fifo;
1887         struct clk *pclk, *hclk;
1888         struct usba_udc *udc = &the_udc;
1889         int irq, ret, i;
1890
1891         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1892         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1893         if (!regs || !fifo || !pdata)
1894                 return -ENXIO;
1895
1896         irq = platform_get_irq(pdev, 0);
1897         if (irq < 0)
1898                 return irq;
1899
1900         pclk = clk_get(&pdev->dev, "pclk");
1901         if (IS_ERR(pclk))
1902                 return PTR_ERR(pclk);
1903         hclk = clk_get(&pdev->dev, "hclk");
1904         if (IS_ERR(hclk)) {
1905                 ret = PTR_ERR(hclk);
1906                 goto err_get_hclk;
1907         }
1908
1909         spin_lock_init(&udc->lock);
1910         udc->pdev = pdev;
1911         udc->pclk = pclk;
1912         udc->hclk = hclk;
1913         udc->vbus_pin = -1;
1914
1915         ret = -ENOMEM;
1916         udc->regs = ioremap(regs->start, regs->end - regs->start + 1);
1917         if (!udc->regs) {
1918                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
1919                 goto err_map_regs;
1920         }
1921         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
1922                  (unsigned long)regs->start, udc->regs);
1923         udc->fifo = ioremap(fifo->start, fifo->end - fifo->start + 1);
1924         if (!udc->fifo) {
1925                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
1926                 goto err_map_fifo;
1927         }
1928         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
1929                  (unsigned long)fifo->start, udc->fifo);
1930
1931         device_initialize(&udc->gadget.dev);
1932         udc->gadget.dev.parent = &pdev->dev;
1933         udc->gadget.dev.dma_mask = pdev->dev.dma_mask;
1934
1935         platform_set_drvdata(pdev, udc);
1936
1937         /* Make sure we start from a clean slate */
1938         clk_enable(pclk);
1939         toggle_bias(0);
1940         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1941         clk_disable(pclk);
1942
1943         usba_ep = kmalloc(sizeof(struct usba_ep) * pdata->num_ep,
1944                           GFP_KERNEL);
1945         if (!usba_ep)
1946                 goto err_alloc_ep;
1947
1948         the_udc.gadget.ep0 = &usba_ep[0].ep;
1949
1950         INIT_LIST_HEAD(&usba_ep[0].ep.ep_list);
1951         usba_ep[0].ep_regs = udc->regs + USBA_EPT_BASE(0);
1952         usba_ep[0].dma_regs = udc->regs + USBA_DMA_BASE(0);
1953         usba_ep[0].fifo = udc->fifo + USBA_FIFO_BASE(0);
1954         usba_ep[0].ep.ops = &usba_ep_ops;
1955         usba_ep[0].ep.name = pdata->ep[0].name;
1956         usba_ep[0].ep.maxpacket = pdata->ep[0].fifo_size;
1957         usba_ep[0].udc = &the_udc;
1958         INIT_LIST_HEAD(&usba_ep[0].queue);
1959         usba_ep[0].fifo_size = pdata->ep[0].fifo_size;
1960         usba_ep[0].nr_banks = pdata->ep[0].nr_banks;
1961         usba_ep[0].index = pdata->ep[0].index;
1962         usba_ep[0].can_dma = pdata->ep[0].can_dma;
1963         usba_ep[0].can_isoc = pdata->ep[0].can_isoc;
1964
1965         for (i = 1; i < pdata->num_ep; i++) {
1966                 struct usba_ep *ep = &usba_ep[i];
1967
1968                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1969                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1970                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1971                 ep->ep.ops = &usba_ep_ops;
1972                 ep->ep.name = pdata->ep[i].name;
1973                 ep->ep.maxpacket = pdata->ep[i].fifo_size;
1974                 ep->udc = &the_udc;
1975                 INIT_LIST_HEAD(&ep->queue);
1976                 ep->fifo_size = pdata->ep[i].fifo_size;
1977                 ep->nr_banks = pdata->ep[i].nr_banks;
1978                 ep->index = pdata->ep[i].index;
1979                 ep->can_dma = pdata->ep[i].can_dma;
1980                 ep->can_isoc = pdata->ep[i].can_isoc;
1981
1982                 list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1983         }
1984
1985         ret = request_irq(irq, usba_udc_irq, 0, "atmel_usba_udc", udc);
1986         if (ret) {
1987                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
1988                         irq, ret);
1989                 goto err_request_irq;
1990         }
1991         udc->irq = irq;
1992
1993         ret = device_add(&udc->gadget.dev);
1994         if (ret) {
1995                 dev_dbg(&pdev->dev, "Could not add gadget: %d\n", ret);
1996                 goto err_device_add;
1997         }
1998
1999         if (pdata->vbus_pin >= 0) {
2000                 if (!gpio_request(pdata->vbus_pin, "atmel_usba_udc")) {
2001                         udc->vbus_pin = pdata->vbus_pin;
2002
2003                         ret = request_irq(gpio_to_irq(udc->vbus_pin),
2004                                         usba_vbus_irq, 0,
2005                                         "atmel_usba_udc", udc);
2006                         if (ret) {
2007                                 gpio_free(udc->vbus_pin);
2008                                 udc->vbus_pin = -1;
2009                                 dev_warn(&udc->pdev->dev,
2010                                          "failed to request vbus irq; "
2011                                          "assuming always on\n");
2012                         } else {
2013                                 disable_irq(gpio_to_irq(udc->vbus_pin));
2014                         }
2015                 }
2016         }
2017
2018         usba_init_debugfs(udc);
2019         for (i = 1; i < pdata->num_ep; i++)
2020                 usba_ep_init_debugfs(udc, &usba_ep[i]);
2021
2022         return 0;
2023
2024 err_device_add:
2025         free_irq(irq, udc);
2026 err_request_irq:
2027         kfree(usba_ep);
2028 err_alloc_ep:
2029         iounmap(udc->fifo);
2030 err_map_fifo:
2031         iounmap(udc->regs);
2032 err_map_regs:
2033         clk_put(hclk);
2034 err_get_hclk:
2035         clk_put(pclk);
2036
2037         platform_set_drvdata(pdev, NULL);
2038
2039         return ret;
2040 }
2041
2042 static int __exit usba_udc_remove(struct platform_device *pdev)
2043 {
2044         struct usba_udc *udc;
2045         int i;
2046         struct usba_platform_data *pdata = pdev->dev.platform_data;
2047
2048         udc = platform_get_drvdata(pdev);
2049
2050         for (i = 1; i < pdata->num_ep; i++)
2051                 usba_ep_cleanup_debugfs(&usba_ep[i]);
2052         usba_cleanup_debugfs(udc);
2053
2054         if (udc->vbus_pin != -1)
2055                 gpio_free(udc->vbus_pin);
2056
2057         free_irq(udc->irq, udc);
2058         kfree(usba_ep);
2059         iounmap(udc->fifo);
2060         iounmap(udc->regs);
2061         clk_put(udc->hclk);
2062         clk_put(udc->pclk);
2063
2064         device_unregister(&udc->gadget.dev);
2065
2066         return 0;
2067 }
2068
2069 static struct platform_driver udc_driver = {
2070         .remove         = __exit_p(usba_udc_remove),
2071         .driver         = {
2072                 .name           = "atmel_usba_udc",
2073                 .owner          = THIS_MODULE,
2074         },
2075 };
2076
2077 static int __init udc_init(void)
2078 {
2079         return platform_driver_probe(&udc_driver, usba_udc_probe);
2080 }
2081 module_init(udc_init);
2082
2083 static void __exit udc_exit(void)
2084 {
2085         platform_driver_unregister(&udc_driver);
2086 }
2087 module_exit(udc_exit);
2088
2089 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2090 MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
2091 MODULE_LICENSE("GPL");
2092 MODULE_ALIAS("platform:atmel_usba_udc");