drivers/usb/gadget/udc/atmel_usba_udc.c

   1 /*
   2  * Driver for the Atmel USBA high speed USB device controller
   3  *
   4  * Copyright (C) 2005-2007 Atmel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/clk.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/io.h>
  15 #include <linux/slab.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/list.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/usb/ch9.h>
  21 #include <linux/usb/gadget.h>
  22 #include <linux/usb/atmel_usba_udc.h>
  23 #include <linux/delay.h>
  24 #include <linux/platform_data/atmel.h>
  25 #include <linux/of.h>
  26 #include <linux/of_gpio.h>
  27
  28 #include <asm/gpio.h>
  29
  30 #include "atmel_usba_udc.h"
  31
  32 #ifdef CONFIG_USB_GADGET_DEBUG_FS
  33 #include <linux/debugfs.h>
  34 #include <linux/uaccess.h>
  35
  36 static int queue_dbg_open(struct inode *inode, struct file *file)
  37 {
  38         struct usba_ep *ep = inode->i_private;
  39         struct usba_request *req, *req_copy;
  40         struct list_head *queue_data;
  41
  42         queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
  43         if (!queue_data)
  44                 return -ENOMEM;
  45         INIT_LIST_HEAD(queue_data);
  46
  47         spin_lock_irq(&ep->udc->lock);
  48         list_for_each_entry(req, &ep->queue, queue) {
  49                 req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
  50                 if (!req_copy)
  51                         goto fail;
  52                 list_add_tail(&req_copy->queue, queue_data);
  53         }
  54         spin_unlock_irq(&ep->udc->lock);
  55
  56         file->private_data = queue_data;
  57         return 0;
  58
  59 fail:
  60         spin_unlock_irq(&ep->udc->lock);
  61         list_for_each_entry_safe(req, req_copy, queue_data, queue) {
  62                 list_del(&req->queue);
  63                 kfree(req);
  64         }
  65         kfree(queue_data);
  66         return -ENOMEM;
  67 }
  68
  69 /*
  70  * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
  71  *
  72  * b: buffer address
  73  * l: buffer length
  74  * I/i: interrupt/no interrupt
  75  * Z/z: zero/no zero
  76  * S/s: short ok/short not ok
  77  * s: status
  78  * n: nr_packets
  79  * F/f: submitted/not submitted to FIFO
  80  * D/d: using/not using DMA
  81  * L/l: last transaction/not last transaction
  82  */
  83 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
  84                 size_t nbytes, loff_t *ppos)
  85 {
  86         struct list_head *queue = file->private_data;
  87         struct usba_request *req, *tmp_req;
  88         size_t len, remaining, actual = 0;
  89         char tmpbuf[38];
  90
  91         if (!access_ok(VERIFY_WRITE, buf, nbytes))
  92                 return -EFAULT;
  93
  94         mutex_lock(&file_inode(file)->i_mutex);
  95         list_for_each_entry_safe(req, tmp_req, queue, queue) {
  96                 len = snprintf(tmpbuf, sizeof(tmpbuf),
  97                                 "%8p %08x %c%c%c %5d %c%c%c\n",
  98                                 req->req.buf, req->req.length,
  99                                 req->req.no_interrupt ? 'i' : 'I',
 100                                 req->req.zero ? 'Z' : 'z',
 101                                 req->req.short_not_ok ? 's' : 'S',
 102                                 req->req.status,
 103                                 req->submitted ? 'F' : 'f',
 104                                 req->using_dma ? 'D' : 'd',
 105                                 req->last_transaction ? 'L' : 'l');
 106                 len = min(len, sizeof(tmpbuf));
 107                 if (len > nbytes)
 108                         break;
 109
 110                 list_del(&req->queue);
 111                 kfree(req);
 112
 113                 remaining = __copy_to_user(buf, tmpbuf, len);
 114                 actual += len - remaining;
 115                 if (remaining)
 116                         break;
 117
 118                 nbytes -= len;
 119                 buf += len;
 120         }
 121         mutex_unlock(&file_inode(file)->i_mutex);
 122
 123         return actual;
 124 }
 125
 126 static int queue_dbg_release(struct inode *inode, struct file *file)
 127 {
 128         struct list_head *queue_data = file->private_data;
 129         struct usba_request *req, *tmp_req;
 130
 131         list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
 132                 list_del(&req->queue);
 133                 kfree(req);
 134         }
 135         kfree(queue_data);
 136         return 0;
 137 }
 138
 139 static int regs_dbg_open(struct inode *inode, struct file *file)
 140 {
 141         struct usba_udc *udc;
 142         unsigned int i;
 143         u32 *data;
 144         int ret = -ENOMEM;
 145
 146         mutex_lock(&inode->i_mutex);
 147         udc = inode->i_private;
 148         data = kmalloc(inode->i_size, GFP_KERNEL);
 149         if (!data)
 150                 goto out;
 151
 152         spin_lock_irq(&udc->lock);
 153         for (i = 0; i < inode->i_size / 4; i++)
 154                 data[i] = __raw_readl(udc->regs + i * 4);
 155         spin_unlock_irq(&udc->lock);
 156
 157         file->private_data = data;
 158         ret = 0;
 159
 160 out:
 161         mutex_unlock(&inode->i_mutex);
 162
 163         return ret;
 164 }
 165
 166 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
 167                 size_t nbytes, loff_t *ppos)
 168 {
 169         struct inode *inode = file_inode(file);
 170         int ret;
 171
 172         mutex_lock(&inode->i_mutex);
 173         ret = simple_read_from_buffer(buf, nbytes, ppos,
 174                         file->private_data,
 175                         file_inode(file)->i_size);
 176         mutex_unlock(&inode->i_mutex);
 177
 178         return ret;
 179 }
 180
 181 static int regs_dbg_release(struct inode *inode, struct file *file)
 182 {
 183         kfree(file->private_data);
 184         return 0;
 185 }
 186
 187 const struct file_operations queue_dbg_fops = {
 188         .owner          = THIS_MODULE,
 189         .open           = queue_dbg_open,
 190         .llseek         = no_llseek,
 191         .read           = queue_dbg_read,
 192         .release        = queue_dbg_release,
 193 };
 194
 195 const struct file_operations regs_dbg_fops = {
 196         .owner          = THIS_MODULE,
 197         .open           = regs_dbg_open,
 198         .llseek         = generic_file_llseek,
 199         .read           = regs_dbg_read,
 200         .release        = regs_dbg_release,
 201 };
 202
 203 static void usba_ep_init_debugfs(struct usba_udc *udc,
 204                 struct usba_ep *ep)
 205 {
 206         struct dentry *ep_root;
 207
 208         ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
 209         if (!ep_root)
 210                 goto err_root;
 211         ep->debugfs_dir = ep_root;
 212
 213         ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
 214                                                 ep, &queue_dbg_fops);
 215         if (!ep->debugfs_queue)
 216                 goto err_queue;
 217
 218         if (ep->can_dma) {
 219                 ep->debugfs_dma_status
 220                         = debugfs_create_u32("dma_status", 0400, ep_root,
 221                                         &ep->last_dma_status);
 222                 if (!ep->debugfs_dma_status)
 223                         goto err_dma_status;
 224         }
 225         if (ep_is_control(ep)) {
 226                 ep->debugfs_state
 227                         = debugfs_create_u32("state", 0400, ep_root,
 228                                         &ep->state);
 229                 if (!ep->debugfs_state)
 230                         goto err_state;
 231         }
 232
 233         return;
 234
 235 err_state:
 236         if (ep->can_dma)
 237                 debugfs_remove(ep->debugfs_dma_status);
 238 err_dma_status:
 239         debugfs_remove(ep->debugfs_queue);
 240 err_queue:
 241         debugfs_remove(ep_root);
 242 err_root:
 243         dev_err(&ep->udc->pdev->dev,
 244                 "failed to create debugfs directory for %s\n", ep->ep.name);
 245 }
 246
 247 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 248 {
 249         debugfs_remove(ep->debugfs_queue);
 250         debugfs_remove(ep->debugfs_dma_status);
 251         debugfs_remove(ep->debugfs_state);
 252         debugfs_remove(ep->debugfs_dir);
 253         ep->debugfs_dma_status = NULL;
 254         ep->debugfs_dir = NULL;
 255 }
 256
 257 static void usba_init_debugfs(struct usba_udc *udc)
 258 {
 259         struct dentry *root, *regs;
 260         struct resource *regs_resource;
 261
 262         root = debugfs_create_dir(udc->gadget.name, NULL);
 263         if (IS_ERR(root) || !root)
 264                 goto err_root;
 265         udc->debugfs_root = root;
 266
 267         regs = debugfs_create_file("regs", 0400, root, udc, &regs_dbg_fops);
 268         if (!regs)
 269                 goto err_regs;
 270
 271         regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
 272                                 CTRL_IOMEM_ID);
 273         regs->d_inode->i_size = resource_size(regs_resource);
 274         udc->debugfs_regs = regs;
 275
 276         usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
 277
 278         return;
 279
 280 err_regs:
 281         debugfs_remove(root);
 282 err_root:
 283         udc->debugfs_root = NULL;
 284         dev_err(&udc->pdev->dev, "debugfs is not available\n");
 285 }
 286
 287 static void usba_cleanup_debugfs(struct usba_udc *udc)
 288 {
 289         usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
 290         debugfs_remove(udc->debugfs_regs);
 291         debugfs_remove(udc->debugfs_root);
 292         udc->debugfs_regs = NULL;
 293         udc->debugfs_root = NULL;
 294 }
 295 #else
 296 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
 297                                          struct usba_ep *ep)
 298 {
 299
 300 }
 301
 302 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 303 {
 304
 305 }
 306
 307 static inline void usba_init_debugfs(struct usba_udc *udc)
 308 {
 309
 310 }
 311
 312 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
 313 {
 314
 315 }
 316 #endif
 317
 318 static int vbus_is_present(struct usba_udc *udc)
 319 {
 320         if (gpio_is_valid(udc->vbus_pin))
 321                 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
 322
 323         /* No Vbus detection: Assume always present */
 324         return 1;
 325 }
 326
 327 #if defined(CONFIG_ARCH_AT91SAM9RL)
 328
 329 #include <linux/clk/at91_pmc.h>
 330
 331 static void toggle_bias(int is_on)
 332 {
 333         unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
 334
 335         if (is_on)
 336                 at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
 337         else
 338                 at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
 339 }
 340
 341 #else
 342
 343 static void toggle_bias(int is_on)
 344 {
 345 }
 346
 347 #endif /* CONFIG_ARCH_AT91SAM9RL */
 348
 349 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 350 {
 351         unsigned int transaction_len;
 352
 353         transaction_len = req->req.length - req->req.actual;
 354         req->last_transaction = 1;
 355         if (transaction_len > ep->ep.maxpacket) {
 356                 transaction_len = ep->ep.maxpacket;
 357                 req->last_transaction = 0;
 358         } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
 359                 req->last_transaction = 0;
 360
 361         DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
 362                 ep->ep.name, req, transaction_len,
 363                 req->last_transaction ? ", done" : "");
 364
 365         memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
 366         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 367         req->req.actual += transaction_len;
 368 }
 369
 370 static void submit_request(struct usba_ep *ep, struct usba_request *req)
 371 {
 372         DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
 373                 ep->ep.name, req, req->req.length);
 374
 375         req->req.actual = 0;
 376         req->submitted = 1;
 377
 378         if (req->using_dma) {
 379                 if (req->req.length == 0) {
 380                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 381                         return;
 382                 }
 383
 384                 if (req->req.zero)
 385                         usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
 386                 else
 387                         usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
 388
 389                 usba_dma_writel(ep, ADDRESS, req->req.dma);
 390                 usba_dma_writel(ep, CONTROL, req->ctrl);
 391         } else {
 392                 next_fifo_transaction(ep, req);
 393                 if (req->last_transaction) {
 394                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
 395                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 396                 } else {
 397                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
 398                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 399                 }
 400         }
 401 }
 402
 403 static void submit_next_request(struct usba_ep *ep)
 404 {
 405         struct usba_request *req;
 406
 407         if (list_empty(&ep->queue)) {
 408                 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
 409                 return;
 410         }
 411
 412         req = list_entry(ep->queue.next, struct usba_request, queue);
 413         if (!req->submitted)
 414                 submit_request(ep, req);
 415 }
 416
 417 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
 418 {
 419         ep->state = STATUS_STAGE_IN;
 420         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 421         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 422 }
 423
 424 static void receive_data(struct usba_ep *ep)
 425 {
 426         struct usba_udc *udc = ep->udc;
 427         struct usba_request *req;
 428         unsigned long status;
 429         unsigned int bytecount, nr_busy;
 430         int is_complete = 0;
 431
 432         status = usba_ep_readl(ep, STA);
 433         nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 434
 435         DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
 436
 437         while (nr_busy > 0) {
 438                 if (list_empty(&ep->queue)) {
 439                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 440                         break;
 441                 }
 442                 req = list_entry(ep->queue.next,
 443                                  struct usba_request, queue);
 444
 445                 bytecount = USBA_BFEXT(BYTE_COUNT, status);
 446
 447                 if (status & (1 << 31))
 448                         is_complete = 1;
 449                 if (req->req.actual + bytecount >= req->req.length) {
 450                         is_complete = 1;
 451                         bytecount = req->req.length - req->req.actual;
 452                 }
 453
 454                 memcpy_fromio(req->req.buf + req->req.actual,
 455                                 ep->fifo, bytecount);
 456                 req->req.actual += bytecount;
 457
 458                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
 459
 460                 if (is_complete) {
 461                         DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
 462                         req->req.status = 0;
 463                         list_del_init(&req->queue);
 464                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 465                         spin_unlock(&udc->lock);
 466                         usb_gadget_giveback_request(&ep->ep, &req->req);
 467                         spin_lock(&udc->lock);
 468                 }
 469
 470                 status = usba_ep_readl(ep, STA);
 471                 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 472
 473                 if (is_complete && ep_is_control(ep)) {
 474                         send_status(udc, ep);
 475                         break;
 476                 }
 477         }
 478 }
 479
 480 static void
 481 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
 482 {
 483         struct usba_udc *udc = ep->udc;
 484
 485         WARN_ON(!list_empty(&req->queue));
 486
 487         if (req->req.status == -EINPROGRESS)
 488                 req->req.status = status;
 489
 490         if (req->using_dma)
 491                 usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
 492
 493         DBG(DBG_GADGET | DBG_REQ,
 494                 "%s: req %p complete: status %d, actual %u\n",
 495                 ep->ep.name, req, req->req.status, req->req.actual);
 496
 497         spin_unlock(&udc->lock);
 498         usb_gadget_giveback_request(&ep->ep, &req->req);
 499         spin_lock(&udc->lock);
 500 }
 501
 502 static void
 503 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
 504 {
 505         struct usba_request *req, *tmp_req;
 506
 507         list_for_each_entry_safe(req, tmp_req, list, queue) {
 508                 list_del_init(&req->queue);
 509                 request_complete(ep, req, status);
 510         }
 511 }
 512
 513 static int
 514 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 515 {
 516         struct usba_ep *ep = to_usba_ep(_ep);
 517         struct usba_udc *udc = ep->udc;
 518         unsigned long flags, ept_cfg, maxpacket;
 519         unsigned int nr_trans;
 520
 521         DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
 522
 523         maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
 524
 525         if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
 526                         || ep->index == 0
 527                         || desc->bDescriptorType != USB_DT_ENDPOINT
 528                         || maxpacket == 0
 529                         || maxpacket > ep->fifo_size) {
 530                 DBG(DBG_ERR, "ep_enable: Invalid argument");
 531                 return -EINVAL;
 532         }
 533
 534         ep->is_isoc = 0;
 535         ep->is_in = 0;
 536
 537         if (maxpacket <= 8)
 538                 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
 539         else
 540                 /* LSB is bit 1, not 0 */
 541                 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
 542
 543         DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
 544                         ep->ep.name, ept_cfg, maxpacket);
 545
 546         if (usb_endpoint_dir_in(desc)) {
 547                 ep->is_in = 1;
 548                 ept_cfg |= USBA_EPT_DIR_IN;
 549         }
 550
 551         switch (usb_endpoint_type(desc)) {
 552         case USB_ENDPOINT_XFER_CONTROL:
 553                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 554                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
 555                 break;
 556         case USB_ENDPOINT_XFER_ISOC:
 557                 if (!ep->can_isoc) {
 558                         DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
 559                                         ep->ep.name);
 560                         return -EINVAL;
 561                 }
 562
 563                 /*
 564                  * Bits 11:12 specify number of _additional_
 565                  * transactions per microframe.
 566                  */
 567                 nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
 568                 if (nr_trans > 3)
 569                         return -EINVAL;
 570
 571                 ep->is_isoc = 1;
 572                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 573
 574                 /*
 575                  * Do triple-buffering on high-bandwidth iso endpoints.
 576                  */
 577                 if (nr_trans > 1 && ep->nr_banks == 3)
 578                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
 579                 else
 580                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 581                 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 582                 break;
 583         case USB_ENDPOINT_XFER_BULK:
 584                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 585                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 586                 break;
 587         case USB_ENDPOINT_XFER_INT:
 588                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 589                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 590                 break;
 591         }
 592
 593         spin_lock_irqsave(&ep->udc->lock, flags);
 594
 595         ep->ep.desc = desc;
 596         ep->ep.maxpacket = maxpacket;
 597
 598         usba_ep_writel(ep, CFG, ept_cfg);
 599         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 600
 601         if (ep->can_dma) {
 602                 u32 ctrl;
 603
 604                 usba_writel(udc, INT_ENB,
 605                                 (usba_readl(udc, INT_ENB)
 606                                         | USBA_BF(EPT_INT, 1 << ep->index)
 607                                         | USBA_BF(DMA_INT, 1 << ep->index)));
 608                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 609                 usba_ep_writel(ep, CTL_ENB, ctrl);
 610         } else {
 611                 usba_writel(udc, INT_ENB,
 612                                 (usba_readl(udc, INT_ENB)
 613                                         | USBA_BF(EPT_INT, 1 << ep->index)));
 614         }
 615
 616         spin_unlock_irqrestore(&udc->lock, flags);
 617
 618         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 619                         (unsigned long)usba_ep_readl(ep, CFG));
 620         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 621                         (unsigned long)usba_readl(udc, INT_ENB));
 622
 623         return 0;
 624 }
 625
 626 static int usba_ep_disable(struct usb_ep *_ep)
 627 {
 628         struct usba_ep *ep = to_usba_ep(_ep);
 629         struct usba_udc *udc = ep->udc;
 630         LIST_HEAD(req_list);
 631         unsigned long flags;
 632
 633         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 634
 635         spin_lock_irqsave(&udc->lock, flags);
 636
 637         if (!ep->ep.desc) {
 638                 spin_unlock_irqrestore(&udc->lock, flags);
 639                 /* REVISIT because this driver disables endpoints in
 640                  * reset_all_endpoints() before calling disconnect(),
 641                  * most gadget drivers would trigger this non-error ...
 642                  */
 643                 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
 644                         DBG(DBG_ERR, "ep_disable: %s not enabled\n",
 645                                         ep->ep.name);
 646                 return -EINVAL;
 647         }
 648         ep->ep.desc = NULL;
 649
 650         list_splice_init(&ep->queue, &req_list);
 651         if (ep->can_dma) {
 652                 usba_dma_writel(ep, CONTROL, 0);
 653                 usba_dma_writel(ep, ADDRESS, 0);
 654                 usba_dma_readl(ep, STATUS);
 655         }
 656         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 657         usba_writel(udc, INT_ENB,
 658                         usba_readl(udc, INT_ENB)
 659                         & ~USBA_BF(EPT_INT, 1 << ep->index));
 660
 661         request_complete_list(ep, &req_list, -ESHUTDOWN);
 662
 663         spin_unlock_irqrestore(&udc->lock, flags);
 664
 665         return 0;
 666 }
 667
 668 static struct usb_request *
 669 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 670 {
 671         struct usba_request *req;
 672
 673         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 674
 675         req = kzalloc(sizeof(*req), gfp_flags);
 676         if (!req)
 677                 return NULL;
 678
 679         INIT_LIST_HEAD(&req->queue);
 680
 681         return &req->req;
 682 }
 683
 684 static void
 685 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 686 {
 687         struct usba_request *req = to_usba_req(_req);
 688
 689         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 690
 691         kfree(req);
 692 }
 693
 694 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 695                 struct usba_request *req, gfp_t gfp_flags)
 696 {
 697         unsigned long flags;
 698         int ret;
 699
 700         DBG(DBG_DMA, "%s: req l/%u d/%08x %c%c%c\n",
 701                 ep->ep.name, req->req.length, req->req.dma,
 702                 req->req.zero ? 'Z' : 'z',
 703                 req->req.short_not_ok ? 'S' : 's',
 704                 req->req.no_interrupt ? 'I' : 'i');
 705
 706         if (req->req.length > 0x10000) {
 707                 /* Lengths from 0 to 65536 (inclusive) are supported */
 708                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 709                 return -EINVAL;
 710         }
 711
 712         ret = usb_gadget_map_request(&udc->gadget, &req->req, ep->is_in);
 713         if (ret)
 714                 return ret;
 715
 716         req->using_dma = 1;
 717         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 718                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 719                         | USBA_DMA_END_BUF_EN;
 720
 721         if (!ep->is_in)
 722                 req->ctrl |= USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 723
 724         /*
 725          * Add this request to the queue and submit for DMA if
 726          * possible. Check if we're still alive first -- we may have
 727          * received a reset since last time we checked.
 728          */
 729         ret = -ESHUTDOWN;
 730         spin_lock_irqsave(&udc->lock, flags);
 731         if (ep->ep.desc) {
 732                 if (list_empty(&ep->queue))
 733                         submit_request(ep, req);
 734
 735                 list_add_tail(&req->queue, &ep->queue);
 736                 ret = 0;
 737         }
 738         spin_unlock_irqrestore(&udc->lock, flags);
 739
 740         return ret;
 741 }
 742
 743 static int
 744 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 745 {
 746         struct usba_request *req = to_usba_req(_req);
 747         struct usba_ep *ep = to_usba_ep(_ep);
 748         struct usba_udc *udc = ep->udc;
 749         unsigned long flags;
 750         int ret;
 751
 752         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 753                         ep->ep.name, req, _req->length);
 754
 755         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
 756             !ep->ep.desc)
 757                 return -ESHUTDOWN;
 758
 759         req->submitted = 0;
 760         req->using_dma = 0;
 761         req->last_transaction = 0;
 762
 763         _req->status = -EINPROGRESS;
 764         _req->actual = 0;
 765
 766         if (ep->can_dma)
 767                 return queue_dma(udc, ep, req, gfp_flags);
 768
 769         /* May have received a reset since last time we checked */
 770         ret = -ESHUTDOWN;
 771         spin_lock_irqsave(&udc->lock, flags);
 772         if (ep->ep.desc) {
 773                 list_add_tail(&req->queue, &ep->queue);
 774
 775                 if ((!ep_is_control(ep) && ep->is_in) ||
 776                         (ep_is_control(ep)
 777                                 && (ep->state == DATA_STAGE_IN
 778                                         || ep->state == STATUS_STAGE_IN)))
 779                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 780                 else
 781                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 782                 ret = 0;
 783         }
 784         spin_unlock_irqrestore(&udc->lock, flags);
 785
 786         return ret;
 787 }
 788
 789 static void
 790 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 791 {
 792         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 793 }
 794
 795 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 796 {
 797         unsigned int timeout;
 798         u32 status;
 799
 800         /*
 801          * Stop the DMA controller. When writing both CH_EN
 802          * and LINK to 0, the other bits are not affected.
 803          */
 804         usba_dma_writel(ep, CONTROL, 0);
 805
 806         /* Wait for the FIFO to empty */
 807         for (timeout = 40; timeout; --timeout) {
 808                 status = usba_dma_readl(ep, STATUS);
 809                 if (!(status & USBA_DMA_CH_EN))
 810                         break;
 811                 udelay(1);
 812         }
 813
 814         if (pstatus)
 815                 *pstatus = status;
 816
 817         if (timeout == 0) {
 818                 dev_err(&ep->udc->pdev->dev,
 819                         "%s: timed out waiting for DMA FIFO to empty\n",
 820                         ep->ep.name);
 821                 return -ETIMEDOUT;
 822         }
 823
 824         return 0;
 825 }
 826
 827 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 828 {
 829         struct usba_ep *ep = to_usba_ep(_ep);
 830         struct usba_udc *udc = ep->udc;
 831         struct usba_request *req;
 832         unsigned long flags;
 833         u32 status;
 834
 835         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 836                         ep->ep.name, req);
 837
 838         spin_lock_irqsave(&udc->lock, flags);
 839
 840         list_for_each_entry(req, &ep->queue, queue) {
 841                 if (&req->req == _req)
 842                         break;
 843         }
 844
 845         if (&req->req != _req) {
 846                 spin_unlock_irqrestore(&udc->lock, flags);
 847                 return -EINVAL;
 848         }
 849
 850         if (req->using_dma) {
 851                 /*
 852                  * If this request is currently being transferred,
 853                  * stop the DMA controller and reset the FIFO.
 854                  */
 855                 if (ep->queue.next == &req->queue) {
 856                         status = usba_dma_readl(ep, STATUS);
 857                         if (status & USBA_DMA_CH_EN)
 858                                 stop_dma(ep, &status);
 859
 860 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 861                         ep->last_dma_status = status;
 862 #endif
 863
 864                         usba_writel(udc, EPT_RST, 1 << ep->index);
 865
 866                         usba_update_req(ep, req, status);
 867                 }
 868         }
 869
 870         /*
 871          * Errors should stop the queue from advancing until the
 872          * completion function returns.
 873          */
 874         list_del_init(&req->queue);
 875
 876         request_complete(ep, req, -ECONNRESET);
 877
 878         /* Process the next request if any */
 879         submit_next_request(ep);
 880         spin_unlock_irqrestore(&udc->lock, flags);
 881
 882         return 0;
 883 }
 884
 885 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 886 {
 887         struct usba_ep *ep = to_usba_ep(_ep);
 888         struct usba_udc *udc = ep->udc;
 889         unsigned long flags;
 890         int ret = 0;
 891
 892         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 893                         value ? "set" : "clear");
 894
 895         if (!ep->ep.desc) {
 896                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 897                                 ep->ep.name);
 898                 return -ENODEV;
 899         }
 900         if (ep->is_isoc) {
 901                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 902                                 ep->ep.name);
 903                 return -ENOTTY;
 904         }
 905
 906         spin_lock_irqsave(&udc->lock, flags);
 907
 908         /*
 909          * We can't halt IN endpoints while there are still data to be
 910          * transferred
 911          */
 912         if (!list_empty(&ep->queue)
 913                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 914                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 915                 ret = -EAGAIN;
 916         } else {
 917                 if (value)
 918                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 919                 else
 920                         usba_ep_writel(ep, CLR_STA,
 921                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 922                 usba_ep_readl(ep, STA);
 923         }
 924
 925         spin_unlock_irqrestore(&udc->lock, flags);
 926
 927         return ret;
 928 }
 929
 930 static int usba_ep_fifo_status(struct usb_ep *_ep)
 931 {
 932         struct usba_ep *ep = to_usba_ep(_ep);
 933
 934         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 935 }
 936
 937 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 938 {
 939         struct usba_ep *ep = to_usba_ep(_ep);
 940         struct usba_udc *udc = ep->udc;
 941
 942         usba_writel(udc, EPT_RST, 1 << ep->index);
 943 }
 944
 945 static const struct usb_ep_ops usba_ep_ops = {
 946         .enable         = usba_ep_enable,
 947         .disable        = usba_ep_disable,
 948         .alloc_request  = usba_ep_alloc_request,
 949         .free_request   = usba_ep_free_request,
 950         .queue          = usba_ep_queue,
 951         .dequeue        = usba_ep_dequeue,
 952         .set_halt       = usba_ep_set_halt,
 953         .fifo_status    = usba_ep_fifo_status,
 954         .fifo_flush     = usba_ep_fifo_flush,
 955 };
 956
 957 static int usba_udc_get_frame(struct usb_gadget *gadget)
 958 {
 959         struct usba_udc *udc = to_usba_udc(gadget);
 960
 961         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 962 }
 963
 964 static int usba_udc_wakeup(struct usb_gadget *gadget)
 965 {
 966         struct usba_udc *udc = to_usba_udc(gadget);
 967         unsigned long flags;
 968         u32 ctrl;
 969         int ret = -EINVAL;
 970
 971         spin_lock_irqsave(&udc->lock, flags);
 972         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 973                 ctrl = usba_readl(udc, CTRL);
 974                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 975                 ret = 0;
 976         }
 977         spin_unlock_irqrestore(&udc->lock, flags);
 978
 979         return ret;
 980 }
 981
 982 static int
 983 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 984 {
 985         struct usba_udc *udc = to_usba_udc(gadget);
 986         unsigned long flags;
 987
 988         spin_lock_irqsave(&udc->lock, flags);
 989         if (is_selfpowered)
 990                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
 991         else
 992                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 993         spin_unlock_irqrestore(&udc->lock, flags);
 994
 995         return 0;
 996 }
 997
 998 static int atmel_usba_start(struct usb_gadget *gadget,
 999                 struct usb_gadget_driver *driver);
1000 static int atmel_usba_stop(struct usb_gadget *gadget);
1001
1002 static const struct usb_gadget_ops usba_udc_ops = {
1003         .get_frame              = usba_udc_get_frame,
1004         .wakeup                 = usba_udc_wakeup,
1005         .set_selfpowered        = usba_udc_set_selfpowered,
1006         .udc_start              = atmel_usba_start,
1007         .udc_stop               = atmel_usba_stop,
1008 };
1009
1010 static struct usb_endpoint_descriptor usba_ep0_desc = {
1011         .bLength = USB_DT_ENDPOINT_SIZE,
1012         .bDescriptorType = USB_DT_ENDPOINT,
1013         .bEndpointAddress = 0,
1014         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1015         .wMaxPacketSize = cpu_to_le16(64),
1016         /* FIXME: I have no idea what to put here */
1017         .bInterval = 1,
1018 };
1019
1020 static struct usb_gadget usba_gadget_template = {
1021         .ops            = &usba_udc_ops,
1022         .max_speed      = USB_SPEED_HIGH,
1023         .name           = "atmel_usba_udc",
1024 };
1025
1026 /*
1027  * Called with interrupts disabled and udc->lock held.
1028  */
1029 static void reset_all_endpoints(struct usba_udc *udc)
1030 {
1031         struct usba_ep *ep;
1032         struct usba_request *req, *tmp_req;
1033
1034         usba_writel(udc, EPT_RST, ~0UL);
1035
1036         ep = to_usba_ep(udc->gadget.ep0);
1037         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1038                 list_del_init(&req->queue);
1039                 request_complete(ep, req, -ECONNRESET);
1040         }
1041
1042         /* NOTE:  normally, the next call to the gadget driver is in
1043          * charge of disabling endpoints... usually disconnect().
1044          * The exception would be entering a high speed test mode.
1045          *
1046          * FIXME remove this code ... and retest thoroughly.
1047          */
1048         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1049                 if (ep->ep.desc) {
1050                         spin_unlock(&udc->lock);
1051                         usba_ep_disable(&ep->ep);
1052                         spin_lock(&udc->lock);
1053                 }
1054         }
1055 }
1056
1057 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1058 {
1059         struct usba_ep *ep;
1060
1061         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1062                 return to_usba_ep(udc->gadget.ep0);
1063
1064         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1065                 u8 bEndpointAddress;
1066
1067                 if (!ep->ep.desc)
1068                         continue;
1069                 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1070                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1071                         continue;
1072                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1073                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1074                         return ep;
1075         }
1076
1077         return NULL;
1078 }
1079
1080 /* Called with interrupts disabled and udc->lock held */
1081 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1082 {
1083         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1084         ep->state = WAIT_FOR_SETUP;
1085 }
1086
1087 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1088 {
1089         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1090                 return 1;
1091         return 0;
1092 }
1093
1094 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1095 {
1096         u32 regval;
1097
1098         DBG(DBG_BUS, "setting address %u...\n", addr);
1099         regval = usba_readl(udc, CTRL);
1100         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1101         usba_writel(udc, CTRL, regval);
1102 }
1103
1104 static int do_test_mode(struct usba_udc *udc)
1105 {
1106         static const char test_packet_buffer[] = {
1107                 /* JKJKJKJK * 9 */
1108                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1109                 /* JJKKJJKK * 8 */
1110                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1111                 /* JJKKJJKK * 8 */
1112                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1113                 /* JJJJJJJKKKKKKK * 8 */
1114                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1115                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1116                 /* JJJJJJJK * 8 */
1117                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1118                 /* {JKKKKKKK * 10}, JK */
1119                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1120         };
1121         struct usba_ep *ep;
1122         struct device *dev = &udc->pdev->dev;
1123         int test_mode;
1124
1125         test_mode = udc->test_mode;
1126
1127         /* Start from a clean slate */
1128         reset_all_endpoints(udc);
1129
1130         switch (test_mode) {
1131         case 0x0100:
1132                 /* Test_J */
1133                 usba_writel(udc, TST, USBA_TST_J_MODE);
1134                 dev_info(dev, "Entering Test_J mode...\n");
1135                 break;
1136         case 0x0200:
1137                 /* Test_K */
1138                 usba_writel(udc, TST, USBA_TST_K_MODE);
1139                 dev_info(dev, "Entering Test_K mode...\n");
1140                 break;
1141         case 0x0300:
1142                 /*
1143                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1144                  * for Bulk IN transfers
1145                  */
1146                 ep = &udc->usba_ep[0];
1147                 usba_writel(udc, TST,
1148                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1149                 usba_ep_writel(ep, CFG,
1150                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1151                                 | USBA_EPT_DIR_IN
1152                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1153                                 | USBA_BF(BK_NUMBER, 1));
1154                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1155                         set_protocol_stall(udc, ep);
1156                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1157                 } else {
1158                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1159                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1160                 }
1161                 break;
1162         case 0x0400:
1163                 /* Test_Packet */
1164                 ep = &udc->usba_ep[0];
1165                 usba_ep_writel(ep, CFG,
1166                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1167                                 | USBA_EPT_DIR_IN
1168                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1169                                 | USBA_BF(BK_NUMBER, 1));
1170                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1171                         set_protocol_stall(udc, ep);
1172                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1173                 } else {
1174                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1175                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1176                         memcpy_toio(ep->fifo, test_packet_buffer,
1177                                         sizeof(test_packet_buffer));
1178                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1179                         dev_info(dev, "Entering Test_Packet mode...\n");
1180                 }
1181                 break;
1182         default:
1183                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1184                 return -EINVAL;
1185         }
1186
1187         return 0;
1188 }
1189
1190 /* Avoid overly long expressions */
1191 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1192 {
1193         if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1194                 return true;
1195         return false;
1196 }
1197
1198 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1199 {
1200         if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1201                 return true;
1202         return false;
1203 }
1204
1205 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1206 {
1207         if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1208                 return true;
1209         return false;
1210 }
1211
1212 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1213                 struct usb_ctrlrequest *crq)
1214 {
1215         int retval = 0;
1216
1217         switch (crq->bRequest) {
1218         case USB_REQ_GET_STATUS: {
1219                 u16 status;
1220
1221                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1222                         status = cpu_to_le16(udc->devstatus);
1223                 } else if (crq->bRequestType
1224                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1225                         status = cpu_to_le16(0);
1226                 } else if (crq->bRequestType
1227                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1228                         struct usba_ep *target;
1229
1230                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1231                         if (!target)
1232                                 goto stall;
1233
1234                         status = 0;
1235                         if (is_stalled(udc, target))
1236                                 status |= cpu_to_le16(1);
1237                 } else
1238                         goto delegate;
1239
1240                 /* Write directly to the FIFO. No queueing is done. */
1241                 if (crq->wLength != cpu_to_le16(sizeof(status)))
1242                         goto stall;
1243                 ep->state = DATA_STAGE_IN;
1244                 __raw_writew(status, ep->fifo);
1245                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1246                 break;
1247         }
1248
1249         case USB_REQ_CLEAR_FEATURE: {
1250                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1251                         if (feature_is_dev_remote_wakeup(crq))
1252                                 udc->devstatus
1253                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1254                         else
1255                                 /* Can't CLEAR_FEATURE TEST_MODE */
1256                                 goto stall;
1257                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1258                         struct usba_ep *target;
1259
1260                         if (crq->wLength != cpu_to_le16(0)
1261                                         || !feature_is_ep_halt(crq))
1262                                 goto stall;
1263                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1264                         if (!target)
1265                                 goto stall;
1266
1267                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1268                         if (target->index != 0)
1269                                 usba_ep_writel(target, CLR_STA,
1270                                                 USBA_TOGGLE_CLR);
1271                 } else {
1272                         goto delegate;
1273                 }
1274
1275                 send_status(udc, ep);
1276                 break;
1277         }
1278
1279         case USB_REQ_SET_FEATURE: {
1280                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1281                         if (feature_is_dev_test_mode(crq)) {
1282                                 send_status(udc, ep);
1283                                 ep->state = STATUS_STAGE_TEST;
1284                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1285                                 return 0;
1286                         } else if (feature_is_dev_remote_wakeup(crq)) {
1287                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1288                         } else {
1289                                 goto stall;
1290                         }
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
1298                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1299                         if (!target)
1300                                 goto stall;
1301
1302                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1303                 } else
1304                         goto delegate;
1305
1306                 send_status(udc, ep);
1307                 break;
1308         }
1309
1310         case USB_REQ_SET_ADDRESS:
1311                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1312                         goto delegate;
1313
1314                 set_address(udc, le16_to_cpu(crq->wValue));
1315                 send_status(udc, ep);
1316                 ep->state = STATUS_STAGE_ADDR;
1317                 break;
1318
1319         default:
1320 delegate:
1321                 spin_unlock(&udc->lock);
1322                 retval = udc->driver->setup(&udc->gadget, crq);
1323                 spin_lock(&udc->lock);
1324         }
1325
1326         return retval;
1327
1328 stall:
1329         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1330                 "halting endpoint...\n",
1331                 ep->ep.name, crq->bRequestType, crq->bRequest,
1332                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1333                 le16_to_cpu(crq->wLength));
1334         set_protocol_stall(udc, ep);
1335         return -1;
1336 }
1337
1338 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1339 {
1340         struct usba_request *req;
1341         u32 epstatus;
1342         u32 epctrl;
1343
1344 restart:
1345         epstatus = usba_ep_readl(ep, STA);
1346         epctrl = usba_ep_readl(ep, CTL);
1347
1348         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1349                         ep->ep.name, ep->state, epstatus, epctrl);
1350
1351         req = NULL;
1352         if (!list_empty(&ep->queue))
1353                 req = list_entry(ep->queue.next,
1354                                  struct usba_request, queue);
1355
1356         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1357                 if (req->submitted)
1358                         next_fifo_transaction(ep, req);
1359                 else
1360                         submit_request(ep, req);
1361
1362                 if (req->last_transaction) {
1363                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1364                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1365                 }
1366                 goto restart;
1367         }
1368         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1369                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1370
1371                 switch (ep->state) {
1372                 case DATA_STAGE_IN:
1373                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1374                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1375                         ep->state = STATUS_STAGE_OUT;
1376                         break;
1377                 case STATUS_STAGE_ADDR:
1378                         /* Activate our new address */
1379                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1380                                                 | USBA_FADDR_EN));
1381                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1382                         ep->state = WAIT_FOR_SETUP;
1383                         break;
1384                 case STATUS_STAGE_IN:
1385                         if (req) {
1386                                 list_del_init(&req->queue);
1387                                 request_complete(ep, req, 0);
1388                                 submit_next_request(ep);
1389                         }
1390                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1391                         ep->state = WAIT_FOR_SETUP;
1392                         break;
1393                 case STATUS_STAGE_TEST:
1394                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1395                         ep->state = WAIT_FOR_SETUP;
1396                         if (do_test_mode(udc))
1397                                 set_protocol_stall(udc, ep);
1398                         break;
1399                 default:
1400                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1401                                 "halting endpoint...\n",
1402                                 ep->ep.name, ep->state);
1403                         set_protocol_stall(udc, ep);
1404                         break;
1405                 }
1406
1407                 goto restart;
1408         }
1409         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1410                 switch (ep->state) {
1411                 case STATUS_STAGE_OUT:
1412                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1413                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1414
1415                         if (req) {
1416                                 list_del_init(&req->queue);
1417                                 request_complete(ep, req, 0);
1418                         }
1419                         ep->state = WAIT_FOR_SETUP;
1420                         break;
1421
1422                 case DATA_STAGE_OUT:
1423                         receive_data(ep);
1424                         break;
1425
1426                 default:
1427                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1428                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1429                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1430                                 "halting endpoint...\n",
1431                                 ep->ep.name, ep->state);
1432                         set_protocol_stall(udc, ep);
1433                         break;
1434                 }
1435
1436                 goto restart;
1437         }
1438         if (epstatus & USBA_RX_SETUP) {
1439                 union {
1440                         struct usb_ctrlrequest crq;
1441                         unsigned long data[2];
1442                 } crq;
1443                 unsigned int pkt_len;
1444                 int ret;
1445
1446                 if (ep->state != WAIT_FOR_SETUP) {
1447                         /*
1448                          * Didn't expect a SETUP packet at this
1449                          * point. Clean up any pending requests (which
1450                          * may be successful).
1451                          */
1452                         int status = -EPROTO;
1453
1454                         /*
1455                          * RXRDY and TXCOMP are dropped when SETUP
1456                          * packets arrive.  Just pretend we received
1457                          * the status packet.
1458                          */
1459                         if (ep->state == STATUS_STAGE_OUT
1460                                         || ep->state == STATUS_STAGE_IN) {
1461                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1462                                 status = 0;
1463                         }
1464
1465                         if (req) {
1466                                 list_del_init(&req->queue);
1467                                 request_complete(ep, req, status);
1468                         }
1469                 }
1470
1471                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1472                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1473                 if (pkt_len != sizeof(crq)) {
1474                         pr_warning("udc: Invalid packet length %u "
1475                                 "(expected %zu)\n", pkt_len, sizeof(crq));
1476                         set_protocol_stall(udc, ep);
1477                         return;
1478                 }
1479
1480                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1481                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1482
1483                 /* Free up one bank in the FIFO so that we can
1484                  * generate or receive a reply right away. */
1485                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1486
1487                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1488                         ep->state, crq.crq.bRequestType,
1489                         crq.crq.bRequest); */
1490
1491                 if (crq.crq.bRequestType & USB_DIR_IN) {
1492                         /*
1493                          * The USB 2.0 spec states that "if wLength is
1494                          * zero, there is no data transfer phase."
1495                          * However, testusb #14 seems to actually
1496                          * expect a data phase even if wLength = 0...
1497                          */
1498                         ep->state = DATA_STAGE_IN;
1499                 } else {
1500                         if (crq.crq.wLength != cpu_to_le16(0))
1501                                 ep->state = DATA_STAGE_OUT;
1502                         else
1503                                 ep->state = STATUS_STAGE_IN;
1504                 }
1505
1506                 ret = -1;
1507                 if (ep->index == 0)
1508                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1509                 else {
1510                         spin_unlock(&udc->lock);
1511                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1512                         spin_lock(&udc->lock);
1513                 }
1514
1515                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1516                         crq.crq.bRequestType, crq.crq.bRequest,
1517                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1518
1519                 if (ret < 0) {
1520                         /* Let the host know that we failed */
1521                         set_protocol_stall(udc, ep);
1522                 }
1523         }
1524 }
1525
1526 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1527 {
1528         struct usba_request *req;
1529         u32 epstatus;
1530         u32 epctrl;
1531
1532         epstatus = usba_ep_readl(ep, STA);
1533         epctrl = usba_ep_readl(ep, CTL);
1534
1535         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1536
1537         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1538                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1539
1540                 if (list_empty(&ep->queue)) {
1541                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1542                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1543                         return;
1544                 }
1545
1546                 req = list_entry(ep->queue.next, struct usba_request, queue);
1547
1548                 if (req->using_dma) {
1549                         /* Send a zero-length packet */
1550                         usba_ep_writel(ep, SET_STA,
1551                                         USBA_TX_PK_RDY);
1552                         usba_ep_writel(ep, CTL_DIS,
1553                                         USBA_TX_PK_RDY);
1554                         list_del_init(&req->queue);
1555                         submit_next_request(ep);
1556                         request_complete(ep, req, 0);
1557                 } else {
1558                         if (req->submitted)
1559                                 next_fifo_transaction(ep, req);
1560                         else
1561                                 submit_request(ep, req);
1562
1563                         if (req->last_transaction) {
1564                                 list_del_init(&req->queue);
1565                                 submit_next_request(ep);
1566                                 request_complete(ep, req, 0);
1567                         }
1568                 }
1569
1570                 epstatus = usba_ep_readl(ep, STA);
1571                 epctrl = usba_ep_readl(ep, CTL);
1572         }
1573         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1574                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1575                 receive_data(ep);
1576         }
1577 }
1578
1579 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1580 {
1581         struct usba_request *req;
1582         u32 status, control, pending;
1583
1584         status = usba_dma_readl(ep, STATUS);
1585         control = usba_dma_readl(ep, CONTROL);
1586 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1587         ep->last_dma_status = status;
1588 #endif
1589         pending = status & control;
1590         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1591
1592         if (status & USBA_DMA_CH_EN) {
1593                 dev_err(&udc->pdev->dev,
1594                         "DMA_CH_EN is set after transfer is finished!\n");
1595                 dev_err(&udc->pdev->dev,
1596                         "status=%#08x, pending=%#08x, control=%#08x\n",
1597                         status, pending, control);
1598
1599                 /*
1600                  * try to pretend nothing happened. We might have to
1601                  * do something here...
1602                  */
1603         }
1604
1605         if (list_empty(&ep->queue))
1606                 /* Might happen if a reset comes along at the right moment */
1607                 return;
1608
1609         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1610                 req = list_entry(ep->queue.next, struct usba_request, queue);
1611                 usba_update_req(ep, req, status);
1612
1613                 list_del_init(&req->queue);
1614                 submit_next_request(ep);
1615                 request_complete(ep, req, 0);
1616         }
1617 }
1618
1619 static irqreturn_t usba_udc_irq(int irq, void *devid)
1620 {
1621         struct usba_udc *udc = devid;
1622         u32 status;
1623         u32 dma_status;
1624         u32 ep_status;
1625
1626         spin_lock(&udc->lock);
1627
1628         status = usba_readl(udc, INT_STA);
1629         DBG(DBG_INT, "irq, status=%#08x\n", status);
1630
1631         if (status & USBA_DET_SUSPEND) {
1632                 toggle_bias(0);
1633                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1634                 DBG(DBG_BUS, "Suspend detected\n");
1635                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1636                                 && udc->driver && udc->driver->suspend) {
1637                         spin_unlock(&udc->lock);
1638                         udc->driver->suspend(&udc->gadget);
1639                         spin_lock(&udc->lock);
1640                 }
1641         }
1642
1643         if (status & USBA_WAKE_UP) {
1644                 toggle_bias(1);
1645                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1646                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1647         }
1648
1649         if (status & USBA_END_OF_RESUME) {
1650                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1651                 DBG(DBG_BUS, "Resume detected\n");
1652                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1653                                 && udc->driver && udc->driver->resume) {
1654                         spin_unlock(&udc->lock);
1655                         udc->driver->resume(&udc->gadget);
1656                         spin_lock(&udc->lock);
1657                 }
1658         }
1659
1660         dma_status = USBA_BFEXT(DMA_INT, status);
1661         if (dma_status) {
1662                 int i;
1663
1664                 for (i = 1; i <= USBA_NR_DMAS; i++)
1665                         if (dma_status & (1 << i))
1666                                 usba_dma_irq(udc, &udc->usba_ep[i]);
1667         }
1668
1669         ep_status = USBA_BFEXT(EPT_INT, status);
1670         if (ep_status) {
1671                 int i;
1672
1673                 for (i = 0; i < udc->num_ep; i++)
1674                         if (ep_status & (1 << i)) {
1675                                 if (ep_is_control(&udc->usba_ep[i]))
1676                                         usba_control_irq(udc, &udc->usba_ep[i]);
1677                                 else
1678                                         usba_ep_irq(udc, &udc->usba_ep[i]);
1679                         }
1680         }
1681
1682         if (status & USBA_END_OF_RESET) {
1683                 struct usba_ep *ep0;
1684
1685                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1686                 reset_all_endpoints(udc);
1687
1688                 if (udc->gadget.speed != USB_SPEED_UNKNOWN && udc->driver) {
1689                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1690                         spin_unlock(&udc->lock);
1691                         usb_gadget_udc_reset(&udc->gadget, udc->driver);
1692                         spin_lock(&udc->lock);
1693                 }
1694
1695                 if (status & USBA_HIGH_SPEED)
1696                         udc->gadget.speed = USB_SPEED_HIGH;
1697                 else
1698                         udc->gadget.speed = USB_SPEED_FULL;
1699                 DBG(DBG_BUS, "%s bus reset detected\n",
1700                     usb_speed_string(udc->gadget.speed));
1701
1702                 ep0 = &udc->usba_ep[0];
1703                 ep0->ep.desc = &usba_ep0_desc;
1704                 ep0->state = WAIT_FOR_SETUP;
1705                 usba_ep_writel(ep0, CFG,
1706                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1707                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1708                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1709                 usba_ep_writel(ep0, CTL_ENB,
1710                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1711                 usba_writel(udc, INT_ENB,
1712                                 (usba_readl(udc, INT_ENB)
1713                                 | USBA_BF(EPT_INT, 1)
1714                                 | USBA_DET_SUSPEND
1715                                 | USBA_END_OF_RESUME));
1716
1717                 /*
1718                  * Unclear why we hit this irregularly, e.g. in usbtest,
1719                  * but it's clearly harmless...
1720                  */
1721                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1722                         dev_dbg(&udc->pdev->dev,
1723                                  "ODD: EP0 configuration is invalid!\n");
1724         }
1725
1726         spin_unlock(&udc->lock);
1727
1728         return IRQ_HANDLED;
1729 }
1730
1731 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1732 {
1733         struct usba_udc *udc = devid;
1734         int vbus;
1735
1736         /* debounce */
1737         udelay(10);
1738
1739         spin_lock(&udc->lock);
1740
1741         /* May happen if Vbus pin toggles during probe() */
1742         if (!udc->driver)
1743                 goto out;
1744
1745         vbus = vbus_is_present(udc);
1746         if (vbus != udc->vbus_prev) {
1747                 if (vbus) {
1748                         toggle_bias(1);
1749                         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1750                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1751                 } else {
1752                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1753                         reset_all_endpoints(udc);
1754                         toggle_bias(0);
1755                         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1756                         if (udc->driver->disconnect) {
1757                                 spin_unlock(&udc->lock);
1758                                 udc->driver->disconnect(&udc->gadget);
1759                                 spin_lock(&udc->lock);
1760                         }
1761                 }
1762                 udc->vbus_prev = vbus;
1763         }
1764
1765 out:
1766         spin_unlock(&udc->lock);
1767
1768         return IRQ_HANDLED;
1769 }
1770
1771 static int atmel_usba_start(struct usb_gadget *gadget,
1772                 struct usb_gadget_driver *driver)
1773 {
1774         int ret;
1775         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1776         unsigned long flags;
1777
1778         spin_lock_irqsave(&udc->lock, flags);
1779
1780         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1781         udc->driver = driver;
1782         spin_unlock_irqrestore(&udc->lock, flags);
1783
1784         ret = clk_prepare_enable(udc->pclk);
1785         if (ret)
1786                 return ret;
1787         ret = clk_prepare_enable(udc->hclk);
1788         if (ret) {
1789                 clk_disable_unprepare(udc->pclk);
1790                 return ret;
1791         }
1792
1793         udc->vbus_prev = 0;
1794         if (gpio_is_valid(udc->vbus_pin))
1795                 enable_irq(gpio_to_irq(udc->vbus_pin));
1796
1797         /* If Vbus is present, enable the controller and wait for reset */
1798         spin_lock_irqsave(&udc->lock, flags);
1799         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1800                 toggle_bias(1);
1801                 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1802                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1803         }
1804         spin_unlock_irqrestore(&udc->lock, flags);
1805
1806         return 0;
1807 }
1808
1809 static int atmel_usba_stop(struct usb_gadget *gadget)
1810 {
1811         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1812         unsigned long flags;
1813
1814         if (gpio_is_valid(udc->vbus_pin))
1815                 disable_irq(gpio_to_irq(udc->vbus_pin));
1816
1817         spin_lock_irqsave(&udc->lock, flags);
1818         udc->gadget.speed = USB_SPEED_UNKNOWN;
1819         reset_all_endpoints(udc);
1820         spin_unlock_irqrestore(&udc->lock, flags);
1821
1822         /* This will also disable the DP pullup */
1823         toggle_bias(0);
1824         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1825
1826         clk_disable_unprepare(udc->hclk);
1827         clk_disable_unprepare(udc->pclk);
1828
1829         udc->driver = NULL;
1830
1831         return 0;
1832 }
1833
1834 #ifdef CONFIG_OF
1835 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1836                                                     struct usba_udc *udc)
1837 {
1838         u32 val;
1839         const char *name;
1840         enum of_gpio_flags flags;
1841         struct device_node *np = pdev->dev.of_node;
1842         struct device_node *pp;
1843         int i, ret;
1844         struct usba_ep *eps, *ep;
1845
1846         udc->num_ep = 0;
1847
1848         udc->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1849                                                 &flags);
1850         udc->vbus_pin_inverted = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1851
1852         pp = NULL;
1853         while ((pp = of_get_next_child(np, pp)))
1854                 udc->num_ep++;
1855
1856         eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * udc->num_ep,
1857                            GFP_KERNEL);
1858         if (!eps)
1859                 return ERR_PTR(-ENOMEM);
1860
1861         udc->gadget.ep0 = &eps[0].ep;
1862
1863         INIT_LIST_HEAD(&eps[0].ep.ep_list);
1864
1865         pp = NULL;
1866         i = 0;
1867         while ((pp = of_get_next_child(np, pp))) {
1868                 ep = &eps[i];
1869
1870                 ret = of_property_read_u32(pp, "reg", &val);
1871                 if (ret) {
1872                         dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
1873                         goto err;
1874                 }
1875                 ep->index = val;
1876
1877                 ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
1878                 if (ret) {
1879                         dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
1880                         goto err;
1881                 }
1882                 ep->fifo_size = val;
1883
1884                 ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
1885                 if (ret) {
1886                         dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
1887                         goto err;
1888                 }
1889                 ep->nr_banks = val;
1890
1891                 ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
1892                 ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
1893
1894                 ret = of_property_read_string(pp, "name", &name);
1895                 ep->ep.name = name;
1896
1897                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1898                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1899                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1900                 ep->ep.ops = &usba_ep_ops;
1901                 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
1902                 ep->udc = udc;
1903                 INIT_LIST_HEAD(&ep->queue);
1904
1905                 if (i)
1906                         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1907
1908                 i++;
1909         }
1910
1911         if (i == 0) {
1912                 dev_err(&pdev->dev, "of_probe: no endpoint specified\n");
1913                 ret = -EINVAL;
1914                 goto err;
1915         }
1916
1917         return eps;
1918 err:
1919         return ERR_PTR(ret);
1920 }
1921 #else
1922 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1923                                                     struct usba_udc *udc)
1924 {
1925         return ERR_PTR(-ENOSYS);
1926 }
1927 #endif
1928
1929 static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
1930                                                  struct usba_udc *udc)
1931 {
1932         struct usba_platform_data *pdata = dev_get_platdata(&pdev->dev);
1933         struct usba_ep *eps;
1934         int i;
1935
1936         if (!pdata)
1937                 return ERR_PTR(-ENXIO);
1938
1939         eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * pdata->num_ep,
1940                            GFP_KERNEL);
1941         if (!eps)
1942                 return ERR_PTR(-ENOMEM);
1943
1944         udc->gadget.ep0 = &eps[0].ep;
1945
1946         udc->vbus_pin = pdata->vbus_pin;
1947         udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
1948         udc->num_ep = pdata->num_ep;
1949
1950         INIT_LIST_HEAD(&eps[0].ep.ep_list);
1951
1952         for (i = 0; i < pdata->num_ep; i++) {
1953                 struct usba_ep *ep = &eps[i];
1954
1955                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1956                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1957                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1958                 ep->ep.ops = &usba_ep_ops;
1959                 ep->ep.name = pdata->ep[i].name;
1960                 ep->fifo_size = pdata->ep[i].fifo_size;
1961                 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
1962                 ep->udc = udc;
1963                 INIT_LIST_HEAD(&ep->queue);
1964                 ep->nr_banks = pdata->ep[i].nr_banks;
1965                 ep->index = pdata->ep[i].index;
1966                 ep->can_dma = pdata->ep[i].can_dma;
1967                 ep->can_isoc = pdata->ep[i].can_isoc;
1968
1969                 if (i)
1970                         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1971         }
1972
1973         return eps;
1974 }
1975
1976 static int usba_udc_probe(struct platform_device *pdev)
1977 {
1978         struct resource *regs, *fifo;
1979         struct clk *pclk, *hclk;
1980         struct usba_udc *udc;
1981         int irq, ret, i;
1982
1983         udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
1984         if (!udc)
1985                 return -ENOMEM;
1986
1987         udc->gadget = usba_gadget_template;
1988         INIT_LIST_HEAD(&udc->gadget.ep_list);
1989
1990         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1991         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1992         if (!regs || !fifo)
1993                 return -ENXIO;
1994
1995         irq = platform_get_irq(pdev, 0);
1996         if (irq < 0)
1997                 return irq;
1998
1999         pclk = devm_clk_get(&pdev->dev, "pclk");
2000         if (IS_ERR(pclk))
2001                 return PTR_ERR(pclk);
2002         hclk = devm_clk_get(&pdev->dev, "hclk");
2003         if (IS_ERR(hclk))
2004                 return PTR_ERR(hclk);
2005
2006         spin_lock_init(&udc->lock);
2007         udc->pdev = pdev;
2008         udc->pclk = pclk;
2009         udc->hclk = hclk;
2010         udc->vbus_pin = -ENODEV;
2011
2012         ret = -ENOMEM;
2013         udc->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2014         if (!udc->regs) {
2015                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
2016                 return ret;
2017         }
2018         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
2019                  (unsigned long)regs->start, udc->regs);
2020         udc->fifo = devm_ioremap(&pdev->dev, fifo->start, resource_size(fifo));
2021         if (!udc->fifo) {
2022                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
2023                 return ret;
2024         }
2025         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
2026                  (unsigned long)fifo->start, udc->fifo);
2027
2028         platform_set_drvdata(pdev, udc);
2029
2030         /* Make sure we start from a clean slate */
2031         ret = clk_prepare_enable(pclk);
2032         if (ret) {
2033                 dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
2034                 return ret;
2035         }
2036         toggle_bias(0);
2037         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2038         clk_disable_unprepare(pclk);
2039
2040         if (pdev->dev.of_node)
2041                 udc->usba_ep = atmel_udc_of_init(pdev, udc);
2042         else
2043                 udc->usba_ep = usba_udc_pdata(pdev, udc);
2044
2045         if (IS_ERR(udc->usba_ep))
2046                 return PTR_ERR(udc->usba_ep);
2047
2048         ret = devm_request_irq(&pdev->dev, irq, usba_udc_irq, 0,
2049                                 "atmel_usba_udc", udc);
2050         if (ret) {
2051                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2052                         irq, ret);
2053                 return ret;
2054         }
2055         udc->irq = irq;
2056
2057         if (gpio_is_valid(udc->vbus_pin)) {
2058                 if (!devm_gpio_request(&pdev->dev, udc->vbus_pin, "atmel_usba_udc")) {
2059                         ret = devm_request_irq(&pdev->dev,
2060                                         gpio_to_irq(udc->vbus_pin),
2061                                         usba_vbus_irq, 0,
2062                                         "atmel_usba_udc", udc);
2063                         if (ret) {
2064                                 udc->vbus_pin = -ENODEV;
2065                                 dev_warn(&udc->pdev->dev,
2066                                          "failed to request vbus irq; "
2067                                          "assuming always on\n");
2068                         } else {
2069                                 disable_irq(gpio_to_irq(udc->vbus_pin));
2070                         }
2071                 } else {
2072                         /* gpio_request fail so use -EINVAL for gpio_is_valid */
2073                         udc->vbus_pin = -EINVAL;
2074                 }
2075         }
2076
2077         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2078         if (ret)
2079                 return ret;
2080
2081         usba_init_debugfs(udc);
2082         for (i = 1; i < udc->num_ep; i++)
2083                 usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2084
2085         return 0;
2086 }
2087
2088 static int __exit usba_udc_remove(struct platform_device *pdev)
2089 {
2090         struct usba_udc *udc;
2091         int i;
2092
2093         udc = platform_get_drvdata(pdev);
2094
2095         usb_del_gadget_udc(&udc->gadget);
2096
2097         for (i = 1; i < udc->num_ep; i++)
2098                 usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2099         usba_cleanup_debugfs(udc);
2100
2101         return 0;
2102 }
2103
2104 #if defined(CONFIG_OF)
2105 static const struct of_device_id atmel_udc_dt_ids[] = {
2106         { .compatible = "atmel,at91sam9rl-udc" },
2107         { /* sentinel */ }
2108 };
2109
2110 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
2111 #endif
2112
2113 static struct platform_driver udc_driver = {
2114         .remove         = __exit_p(usba_udc_remove),
2115         .driver         = {
2116                 .name           = "atmel_usba_udc",
2117                 .of_match_table = of_match_ptr(atmel_udc_dt_ids),
2118         },
2119 };
2120
2121 module_platform_driver_probe(udc_driver, usba_udc_probe);
2122
2123 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2124 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2125 MODULE_LICENSE("GPL");
2126 MODULE_ALIAS("platform:atmel_usba_udc");