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 = to_usba_req(_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         if (req->using_dma) {
 841                 /*
 842                  * If this request is currently being transferred,
 843                  * stop the DMA controller and reset the FIFO.
 844                  */
 845                 if (ep->queue.next == &req->queue) {
 846                         status = usba_dma_readl(ep, STATUS);
 847                         if (status & USBA_DMA_CH_EN)
 848                                 stop_dma(ep, &status);
 849
 850 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 851                         ep->last_dma_status = status;
 852 #endif
 853
 854                         usba_writel(udc, EPT_RST, 1 << ep->index);
 855
 856                         usba_update_req(ep, req, status);
 857                 }
 858         }
 859
 860         /*
 861          * Errors should stop the queue from advancing until the
 862          * completion function returns.
 863          */
 864         list_del_init(&req->queue);
 865
 866         request_complete(ep, req, -ECONNRESET);
 867
 868         /* Process the next request if any */
 869         submit_next_request(ep);
 870         spin_unlock_irqrestore(&udc->lock, flags);
 871
 872         return 0;
 873 }
 874
 875 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 876 {
 877         struct usba_ep *ep = to_usba_ep(_ep);
 878         struct usba_udc *udc = ep->udc;
 879         unsigned long flags;
 880         int ret = 0;
 881
 882         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 883                         value ? "set" : "clear");
 884
 885         if (!ep->ep.desc) {
 886                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 887                                 ep->ep.name);
 888                 return -ENODEV;
 889         }
 890         if (ep->is_isoc) {
 891                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 892                                 ep->ep.name);
 893                 return -ENOTTY;
 894         }
 895
 896         spin_lock_irqsave(&udc->lock, flags);
 897
 898         /*
 899          * We can't halt IN endpoints while there are still data to be
 900          * transferred
 901          */
 902         if (!list_empty(&ep->queue)
 903                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 904                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 905                 ret = -EAGAIN;
 906         } else {
 907                 if (value)
 908                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 909                 else
 910                         usba_ep_writel(ep, CLR_STA,
 911                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 912                 usba_ep_readl(ep, STA);
 913         }
 914
 915         spin_unlock_irqrestore(&udc->lock, flags);
 916
 917         return ret;
 918 }
 919
 920 static int usba_ep_fifo_status(struct usb_ep *_ep)
 921 {
 922         struct usba_ep *ep = to_usba_ep(_ep);
 923
 924         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 925 }
 926
 927 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 928 {
 929         struct usba_ep *ep = to_usba_ep(_ep);
 930         struct usba_udc *udc = ep->udc;
 931
 932         usba_writel(udc, EPT_RST, 1 << ep->index);
 933 }
 934
 935 static const struct usb_ep_ops usba_ep_ops = {
 936         .enable         = usba_ep_enable,
 937         .disable        = usba_ep_disable,
 938         .alloc_request  = usba_ep_alloc_request,
 939         .free_request   = usba_ep_free_request,
 940         .queue          = usba_ep_queue,
 941         .dequeue        = usba_ep_dequeue,
 942         .set_halt       = usba_ep_set_halt,
 943         .fifo_status    = usba_ep_fifo_status,
 944         .fifo_flush     = usba_ep_fifo_flush,
 945 };
 946
 947 static int usba_udc_get_frame(struct usb_gadget *gadget)
 948 {
 949         struct usba_udc *udc = to_usba_udc(gadget);
 950
 951         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 952 }
 953
 954 static int usba_udc_wakeup(struct usb_gadget *gadget)
 955 {
 956         struct usba_udc *udc = to_usba_udc(gadget);
 957         unsigned long flags;
 958         u32 ctrl;
 959         int ret = -EINVAL;
 960
 961         spin_lock_irqsave(&udc->lock, flags);
 962         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 963                 ctrl = usba_readl(udc, CTRL);
 964                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 965                 ret = 0;
 966         }
 967         spin_unlock_irqrestore(&udc->lock, flags);
 968
 969         return ret;
 970 }
 971
 972 static int
 973 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 974 {
 975         struct usba_udc *udc = to_usba_udc(gadget);
 976         unsigned long flags;
 977
 978         spin_lock_irqsave(&udc->lock, flags);
 979         if (is_selfpowered)
 980                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
 981         else
 982                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 983         spin_unlock_irqrestore(&udc->lock, flags);
 984
 985         return 0;
 986 }
 987
 988 static int atmel_usba_start(struct usb_gadget *gadget,
 989                 struct usb_gadget_driver *driver);
 990 static int atmel_usba_stop(struct usb_gadget *gadget);
 991
 992 static const struct usb_gadget_ops usba_udc_ops = {
 993         .get_frame              = usba_udc_get_frame,
 994         .wakeup                 = usba_udc_wakeup,
 995         .set_selfpowered        = usba_udc_set_selfpowered,
 996         .udc_start              = atmel_usba_start,
 997         .udc_stop               = atmel_usba_stop,
 998 };
 999
1000 static struct usb_endpoint_descriptor usba_ep0_desc = {
1001         .bLength = USB_DT_ENDPOINT_SIZE,
1002         .bDescriptorType = USB_DT_ENDPOINT,
1003         .bEndpointAddress = 0,
1004         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1005         .wMaxPacketSize = cpu_to_le16(64),
1006         /* FIXME: I have no idea what to put here */
1007         .bInterval = 1,
1008 };
1009
1010 static struct usb_gadget usba_gadget_template = {
1011         .ops            = &usba_udc_ops,
1012         .max_speed      = USB_SPEED_HIGH,
1013         .name           = "atmel_usba_udc",
1014 };
1015
1016 /*
1017  * Called with interrupts disabled and udc->lock held.
1018  */
1019 static void reset_all_endpoints(struct usba_udc *udc)
1020 {
1021         struct usba_ep *ep;
1022         struct usba_request *req, *tmp_req;
1023
1024         usba_writel(udc, EPT_RST, ~0UL);
1025
1026         ep = to_usba_ep(udc->gadget.ep0);
1027         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1028                 list_del_init(&req->queue);
1029                 request_complete(ep, req, -ECONNRESET);
1030         }
1031
1032         /* NOTE:  normally, the next call to the gadget driver is in
1033          * charge of disabling endpoints... usually disconnect().
1034          * The exception would be entering a high speed test mode.
1035          *
1036          * FIXME remove this code ... and retest thoroughly.
1037          */
1038         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1039                 if (ep->ep.desc) {
1040                         spin_unlock(&udc->lock);
1041                         usba_ep_disable(&ep->ep);
1042                         spin_lock(&udc->lock);
1043                 }
1044         }
1045 }
1046
1047 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1048 {
1049         struct usba_ep *ep;
1050
1051         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1052                 return to_usba_ep(udc->gadget.ep0);
1053
1054         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1055                 u8 bEndpointAddress;
1056
1057                 if (!ep->ep.desc)
1058                         continue;
1059                 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1060                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1061                         continue;
1062                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1063                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1064                         return ep;
1065         }
1066
1067         return NULL;
1068 }
1069
1070 /* Called with interrupts disabled and udc->lock held */
1071 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1072 {
1073         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1074         ep->state = WAIT_FOR_SETUP;
1075 }
1076
1077 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1078 {
1079         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1080                 return 1;
1081         return 0;
1082 }
1083
1084 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1085 {
1086         u32 regval;
1087
1088         DBG(DBG_BUS, "setting address %u...\n", addr);
1089         regval = usba_readl(udc, CTRL);
1090         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1091         usba_writel(udc, CTRL, regval);
1092 }
1093
1094 static int do_test_mode(struct usba_udc *udc)
1095 {
1096         static const char test_packet_buffer[] = {
1097                 /* JKJKJKJK * 9 */
1098                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1099                 /* JJKKJJKK * 8 */
1100                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1101                 /* JJKKJJKK * 8 */
1102                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1103                 /* JJJJJJJKKKKKKK * 8 */
1104                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1105                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1106                 /* JJJJJJJK * 8 */
1107                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1108                 /* {JKKKKKKK * 10}, JK */
1109                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1110         };
1111         struct usba_ep *ep;
1112         struct device *dev = &udc->pdev->dev;
1113         int test_mode;
1114
1115         test_mode = udc->test_mode;
1116
1117         /* Start from a clean slate */
1118         reset_all_endpoints(udc);
1119
1120         switch (test_mode) {
1121         case 0x0100:
1122                 /* Test_J */
1123                 usba_writel(udc, TST, USBA_TST_J_MODE);
1124                 dev_info(dev, "Entering Test_J mode...\n");
1125                 break;
1126         case 0x0200:
1127                 /* Test_K */
1128                 usba_writel(udc, TST, USBA_TST_K_MODE);
1129                 dev_info(dev, "Entering Test_K mode...\n");
1130                 break;
1131         case 0x0300:
1132                 /*
1133                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1134                  * for Bulk IN transfers
1135                  */
1136                 ep = &udc->usba_ep[0];
1137                 usba_writel(udc, TST,
1138                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1139                 usba_ep_writel(ep, CFG,
1140                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1141                                 | USBA_EPT_DIR_IN
1142                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1143                                 | USBA_BF(BK_NUMBER, 1));
1144                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1145                         set_protocol_stall(udc, ep);
1146                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1147                 } else {
1148                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1149                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1150                 }
1151                 break;
1152         case 0x0400:
1153                 /* Test_Packet */
1154                 ep = &udc->usba_ep[0];
1155                 usba_ep_writel(ep, CFG,
1156                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1157                                 | USBA_EPT_DIR_IN
1158                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1159                                 | USBA_BF(BK_NUMBER, 1));
1160                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1161                         set_protocol_stall(udc, ep);
1162                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1163                 } else {
1164                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1165                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1166                         memcpy_toio(ep->fifo, test_packet_buffer,
1167                                         sizeof(test_packet_buffer));
1168                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1169                         dev_info(dev, "Entering Test_Packet mode...\n");
1170                 }
1171                 break;
1172         default:
1173                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1174                 return -EINVAL;
1175         }
1176
1177         return 0;
1178 }
1179
1180 /* Avoid overly long expressions */
1181 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1182 {
1183         if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1184                 return true;
1185         return false;
1186 }
1187
1188 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1189 {
1190         if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1191                 return true;
1192         return false;
1193 }
1194
1195 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1196 {
1197         if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1198                 return true;
1199         return false;
1200 }
1201
1202 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1203                 struct usb_ctrlrequest *crq)
1204 {
1205         int retval = 0;
1206
1207         switch (crq->bRequest) {
1208         case USB_REQ_GET_STATUS: {
1209                 u16 status;
1210
1211                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1212                         status = cpu_to_le16(udc->devstatus);
1213                 } else if (crq->bRequestType
1214                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1215                         status = cpu_to_le16(0);
1216                 } else if (crq->bRequestType
1217                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1218                         struct usba_ep *target;
1219
1220                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1221                         if (!target)
1222                                 goto stall;
1223
1224                         status = 0;
1225                         if (is_stalled(udc, target))
1226                                 status |= cpu_to_le16(1);
1227                 } else
1228                         goto delegate;
1229
1230                 /* Write directly to the FIFO. No queueing is done. */
1231                 if (crq->wLength != cpu_to_le16(sizeof(status)))
1232                         goto stall;
1233                 ep->state = DATA_STAGE_IN;
1234                 __raw_writew(status, ep->fifo);
1235                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1236                 break;
1237         }
1238
1239         case USB_REQ_CLEAR_FEATURE: {
1240                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1241                         if (feature_is_dev_remote_wakeup(crq))
1242                                 udc->devstatus
1243                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1244                         else
1245                                 /* Can't CLEAR_FEATURE TEST_MODE */
1246                                 goto stall;
1247                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1248                         struct usba_ep *target;
1249
1250                         if (crq->wLength != cpu_to_le16(0)
1251                                         || !feature_is_ep_halt(crq))
1252                                 goto stall;
1253                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1254                         if (!target)
1255                                 goto stall;
1256
1257                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1258                         if (target->index != 0)
1259                                 usba_ep_writel(target, CLR_STA,
1260                                                 USBA_TOGGLE_CLR);
1261                 } else {
1262                         goto delegate;
1263                 }
1264
1265                 send_status(udc, ep);
1266                 break;
1267         }
1268
1269         case USB_REQ_SET_FEATURE: {
1270                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1271                         if (feature_is_dev_test_mode(crq)) {
1272                                 send_status(udc, ep);
1273                                 ep->state = STATUS_STAGE_TEST;
1274                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1275                                 return 0;
1276                         } else if (feature_is_dev_remote_wakeup(crq)) {
1277                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1278                         } else {
1279                                 goto stall;
1280                         }
1281                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1282                         struct usba_ep *target;
1283
1284                         if (crq->wLength != cpu_to_le16(0)
1285                                         || !feature_is_ep_halt(crq))
1286                                 goto stall;
1287
1288                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1289                         if (!target)
1290                                 goto stall;
1291
1292                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1293                 } else
1294                         goto delegate;
1295
1296                 send_status(udc, ep);
1297                 break;
1298         }
1299
1300         case USB_REQ_SET_ADDRESS:
1301                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1302                         goto delegate;
1303
1304                 set_address(udc, le16_to_cpu(crq->wValue));
1305                 send_status(udc, ep);
1306                 ep->state = STATUS_STAGE_ADDR;
1307                 break;
1308
1309         default:
1310 delegate:
1311                 spin_unlock(&udc->lock);
1312                 retval = udc->driver->setup(&udc->gadget, crq);
1313                 spin_lock(&udc->lock);
1314         }
1315
1316         return retval;
1317
1318 stall:
1319         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1320                 "halting endpoint...\n",
1321                 ep->ep.name, crq->bRequestType, crq->bRequest,
1322                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1323                 le16_to_cpu(crq->wLength));
1324         set_protocol_stall(udc, ep);
1325         return -1;
1326 }
1327
1328 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1329 {
1330         struct usba_request *req;
1331         u32 epstatus;
1332         u32 epctrl;
1333
1334 restart:
1335         epstatus = usba_ep_readl(ep, STA);
1336         epctrl = usba_ep_readl(ep, CTL);
1337
1338         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1339                         ep->ep.name, ep->state, epstatus, epctrl);
1340
1341         req = NULL;
1342         if (!list_empty(&ep->queue))
1343                 req = list_entry(ep->queue.next,
1344                                  struct usba_request, queue);
1345
1346         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1347                 if (req->submitted)
1348                         next_fifo_transaction(ep, req);
1349                 else
1350                         submit_request(ep, req);
1351
1352                 if (req->last_transaction) {
1353                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1354                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1355                 }
1356                 goto restart;
1357         }
1358         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1359                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1360
1361                 switch (ep->state) {
1362                 case DATA_STAGE_IN:
1363                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1364                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1365                         ep->state = STATUS_STAGE_OUT;
1366                         break;
1367                 case STATUS_STAGE_ADDR:
1368                         /* Activate our new address */
1369                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1370                                                 | USBA_FADDR_EN));
1371                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1372                         ep->state = WAIT_FOR_SETUP;
1373                         break;
1374                 case STATUS_STAGE_IN:
1375                         if (req) {
1376                                 list_del_init(&req->queue);
1377                                 request_complete(ep, req, 0);
1378                                 submit_next_request(ep);
1379                         }
1380                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1381                         ep->state = WAIT_FOR_SETUP;
1382                         break;
1383                 case STATUS_STAGE_TEST:
1384                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1385                         ep->state = WAIT_FOR_SETUP;
1386                         if (do_test_mode(udc))
1387                                 set_protocol_stall(udc, ep);
1388                         break;
1389                 default:
1390                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1391                                 "halting endpoint...\n",
1392                                 ep->ep.name, ep->state);
1393                         set_protocol_stall(udc, ep);
1394                         break;
1395                 }
1396
1397                 goto restart;
1398         }
1399         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1400                 switch (ep->state) {
1401                 case STATUS_STAGE_OUT:
1402                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1403                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1404
1405                         if (req) {
1406                                 list_del_init(&req->queue);
1407                                 request_complete(ep, req, 0);
1408                         }
1409                         ep->state = WAIT_FOR_SETUP;
1410                         break;
1411
1412                 case DATA_STAGE_OUT:
1413                         receive_data(ep);
1414                         break;
1415
1416                 default:
1417                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1418                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1419                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1420                                 "halting endpoint...\n",
1421                                 ep->ep.name, ep->state);
1422                         set_protocol_stall(udc, ep);
1423                         break;
1424                 }
1425
1426                 goto restart;
1427         }
1428         if (epstatus & USBA_RX_SETUP) {
1429                 union {
1430                         struct usb_ctrlrequest crq;
1431                         unsigned long data[2];
1432                 } crq;
1433                 unsigned int pkt_len;
1434                 int ret;
1435
1436                 if (ep->state != WAIT_FOR_SETUP) {
1437                         /*
1438                          * Didn't expect a SETUP packet at this
1439                          * point. Clean up any pending requests (which
1440                          * may be successful).
1441                          */
1442                         int status = -EPROTO;
1443
1444                         /*
1445                          * RXRDY and TXCOMP are dropped when SETUP
1446                          * packets arrive.  Just pretend we received
1447                          * the status packet.
1448                          */
1449                         if (ep->state == STATUS_STAGE_OUT
1450                                         || ep->state == STATUS_STAGE_IN) {
1451                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1452                                 status = 0;
1453                         }
1454
1455                         if (req) {
1456                                 list_del_init(&req->queue);
1457                                 request_complete(ep, req, status);
1458                         }
1459                 }
1460
1461                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1462                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1463                 if (pkt_len != sizeof(crq)) {
1464                         pr_warning("udc: Invalid packet length %u "
1465                                 "(expected %zu)\n", pkt_len, sizeof(crq));
1466                         set_protocol_stall(udc, ep);
1467                         return;
1468                 }
1469
1470                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1471                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1472
1473                 /* Free up one bank in the FIFO so that we can
1474                  * generate or receive a reply right away. */
1475                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1476
1477                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1478                         ep->state, crq.crq.bRequestType,
1479                         crq.crq.bRequest); */
1480
1481                 if (crq.crq.bRequestType & USB_DIR_IN) {
1482                         /*
1483                          * The USB 2.0 spec states that "if wLength is
1484                          * zero, there is no data transfer phase."
1485                          * However, testusb #14 seems to actually
1486                          * expect a data phase even if wLength = 0...
1487                          */
1488                         ep->state = DATA_STAGE_IN;
1489                 } else {
1490                         if (crq.crq.wLength != cpu_to_le16(0))
1491                                 ep->state = DATA_STAGE_OUT;
1492                         else
1493                                 ep->state = STATUS_STAGE_IN;
1494                 }
1495
1496                 ret = -1;
1497                 if (ep->index == 0)
1498                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1499                 else {
1500                         spin_unlock(&udc->lock);
1501                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1502                         spin_lock(&udc->lock);
1503                 }
1504
1505                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1506                         crq.crq.bRequestType, crq.crq.bRequest,
1507                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1508
1509                 if (ret < 0) {
1510                         /* Let the host know that we failed */
1511                         set_protocol_stall(udc, ep);
1512                 }
1513         }
1514 }
1515
1516 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1517 {
1518         struct usba_request *req;
1519         u32 epstatus;
1520         u32 epctrl;
1521
1522         epstatus = usba_ep_readl(ep, STA);
1523         epctrl = usba_ep_readl(ep, CTL);
1524
1525         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1526
1527         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1528                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1529
1530                 if (list_empty(&ep->queue)) {
1531                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1532                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1533                         return;
1534                 }
1535
1536                 req = list_entry(ep->queue.next, struct usba_request, queue);
1537
1538                 if (req->using_dma) {
1539                         /* Send a zero-length packet */
1540                         usba_ep_writel(ep, SET_STA,
1541                                         USBA_TX_PK_RDY);
1542                         usba_ep_writel(ep, CTL_DIS,
1543                                         USBA_TX_PK_RDY);
1544                         list_del_init(&req->queue);
1545                         submit_next_request(ep);
1546                         request_complete(ep, req, 0);
1547                 } else {
1548                         if (req->submitted)
1549                                 next_fifo_transaction(ep, req);
1550                         else
1551                                 submit_request(ep, req);
1552
1553                         if (req->last_transaction) {
1554                                 list_del_init(&req->queue);
1555                                 submit_next_request(ep);
1556                                 request_complete(ep, req, 0);
1557                         }
1558                 }
1559
1560                 epstatus = usba_ep_readl(ep, STA);
1561                 epctrl = usba_ep_readl(ep, CTL);
1562         }
1563         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1564                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1565                 receive_data(ep);
1566                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1567         }
1568 }
1569
1570 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1571 {
1572         struct usba_request *req;
1573         u32 status, control, pending;
1574
1575         status = usba_dma_readl(ep, STATUS);
1576         control = usba_dma_readl(ep, CONTROL);
1577 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1578         ep->last_dma_status = status;
1579 #endif
1580         pending = status & control;
1581         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1582
1583         if (status & USBA_DMA_CH_EN) {
1584                 dev_err(&udc->pdev->dev,
1585                         "DMA_CH_EN is set after transfer is finished!\n");
1586                 dev_err(&udc->pdev->dev,
1587                         "status=%#08x, pending=%#08x, control=%#08x\n",
1588                         status, pending, control);
1589
1590                 /*
1591                  * try to pretend nothing happened. We might have to
1592                  * do something here...
1593                  */
1594         }
1595
1596         if (list_empty(&ep->queue))
1597                 /* Might happen if a reset comes along at the right moment */
1598                 return;
1599
1600         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1601                 req = list_entry(ep->queue.next, struct usba_request, queue);
1602                 usba_update_req(ep, req, status);
1603
1604                 list_del_init(&req->queue);
1605                 submit_next_request(ep);
1606                 request_complete(ep, req, 0);
1607         }
1608 }
1609
1610 static irqreturn_t usba_udc_irq(int irq, void *devid)
1611 {
1612         struct usba_udc *udc = devid;
1613         u32 status;
1614         u32 dma_status;
1615         u32 ep_status;
1616
1617         spin_lock(&udc->lock);
1618
1619         status = usba_readl(udc, INT_STA);
1620         DBG(DBG_INT, "irq, status=%#08x\n", status);
1621
1622         if (status & USBA_DET_SUSPEND) {
1623                 toggle_bias(0);
1624                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1625                 DBG(DBG_BUS, "Suspend detected\n");
1626                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1627                                 && udc->driver && udc->driver->suspend) {
1628                         spin_unlock(&udc->lock);
1629                         udc->driver->suspend(&udc->gadget);
1630                         spin_lock(&udc->lock);
1631                 }
1632         }
1633
1634         if (status & USBA_WAKE_UP) {
1635                 toggle_bias(1);
1636                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1637                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1638         }
1639
1640         if (status & USBA_END_OF_RESUME) {
1641                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1642                 DBG(DBG_BUS, "Resume detected\n");
1643                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1644                                 && udc->driver && udc->driver->resume) {
1645                         spin_unlock(&udc->lock);
1646                         udc->driver->resume(&udc->gadget);
1647                         spin_lock(&udc->lock);
1648                 }
1649         }
1650
1651         dma_status = USBA_BFEXT(DMA_INT, status);
1652         if (dma_status) {
1653                 int i;
1654
1655                 for (i = 1; i <= USBA_NR_DMAS; i++)
1656                         if (dma_status & (1 << i))
1657                                 usba_dma_irq(udc, &udc->usba_ep[i]);
1658         }
1659
1660         ep_status = USBA_BFEXT(EPT_INT, status);
1661         if (ep_status) {
1662                 int i;
1663
1664                 for (i = 0; i < udc->num_ep; i++)
1665                         if (ep_status & (1 << i)) {
1666                                 if (ep_is_control(&udc->usba_ep[i]))
1667                                         usba_control_irq(udc, &udc->usba_ep[i]);
1668                                 else
1669                                         usba_ep_irq(udc, &udc->usba_ep[i]);
1670                         }
1671         }
1672
1673         if (status & USBA_END_OF_RESET) {
1674                 struct usba_ep *ep0;
1675
1676                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1677                 reset_all_endpoints(udc);
1678
1679                 if (udc->gadget.speed != USB_SPEED_UNKNOWN && udc->driver) {
1680                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1681                         spin_unlock(&udc->lock);
1682                         usb_gadget_udc_reset(&udc->gadget, udc->driver);
1683                         spin_lock(&udc->lock);
1684                 }
1685
1686                 if (status & USBA_HIGH_SPEED)
1687                         udc->gadget.speed = USB_SPEED_HIGH;
1688                 else
1689                         udc->gadget.speed = USB_SPEED_FULL;
1690                 DBG(DBG_BUS, "%s bus reset detected\n",
1691                     usb_speed_string(udc->gadget.speed));
1692
1693                 ep0 = &udc->usba_ep[0];
1694                 ep0->ep.desc = &usba_ep0_desc;
1695                 ep0->state = WAIT_FOR_SETUP;
1696                 usba_ep_writel(ep0, CFG,
1697                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1698                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1699                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1700                 usba_ep_writel(ep0, CTL_ENB,
1701                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1702                 usba_writel(udc, INT_ENB,
1703                                 (usba_readl(udc, INT_ENB)
1704                                 | USBA_BF(EPT_INT, 1)
1705                                 | USBA_DET_SUSPEND
1706                                 | USBA_END_OF_RESUME));
1707
1708                 /*
1709                  * Unclear why we hit this irregularly, e.g. in usbtest,
1710                  * but it's clearly harmless...
1711                  */
1712                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1713                         dev_dbg(&udc->pdev->dev,
1714                                  "ODD: EP0 configuration is invalid!\n");
1715         }
1716
1717         spin_unlock(&udc->lock);
1718
1719         return IRQ_HANDLED;
1720 }
1721
1722 static irqreturn_t usba_vbus_irq(int irq, void *devid)
1723 {
1724         struct usba_udc *udc = devid;
1725         int vbus;
1726
1727         /* debounce */
1728         udelay(10);
1729
1730         spin_lock(&udc->lock);
1731
1732         /* May happen if Vbus pin toggles during probe() */
1733         if (!udc->driver)
1734                 goto out;
1735
1736         vbus = vbus_is_present(udc);
1737         if (vbus != udc->vbus_prev) {
1738                 if (vbus) {
1739                         toggle_bias(1);
1740                         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1741                         usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1742                 } else {
1743                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1744                         reset_all_endpoints(udc);
1745                         toggle_bias(0);
1746                         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1747                         if (udc->driver->disconnect) {
1748                                 spin_unlock(&udc->lock);
1749                                 udc->driver->disconnect(&udc->gadget);
1750                                 spin_lock(&udc->lock);
1751                         }
1752                 }
1753                 udc->vbus_prev = vbus;
1754         }
1755
1756 out:
1757         spin_unlock(&udc->lock);
1758
1759         return IRQ_HANDLED;
1760 }
1761
1762 static int atmel_usba_start(struct usb_gadget *gadget,
1763                 struct usb_gadget_driver *driver)
1764 {
1765         int ret;
1766         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1767         unsigned long flags;
1768
1769         spin_lock_irqsave(&udc->lock, flags);
1770
1771         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1772         udc->driver = driver;
1773         spin_unlock_irqrestore(&udc->lock, flags);
1774
1775         ret = clk_prepare_enable(udc->pclk);
1776         if (ret)
1777                 return ret;
1778         ret = clk_prepare_enable(udc->hclk);
1779         if (ret) {
1780                 clk_disable_unprepare(udc->pclk);
1781                 return ret;
1782         }
1783
1784         udc->vbus_prev = 0;
1785         if (gpio_is_valid(udc->vbus_pin))
1786                 enable_irq(gpio_to_irq(udc->vbus_pin));
1787
1788         /* If Vbus is present, enable the controller and wait for reset */
1789         spin_lock_irqsave(&udc->lock, flags);
1790         if (vbus_is_present(udc) && udc->vbus_prev == 0) {
1791                 toggle_bias(1);
1792                 usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1793                 usba_writel(udc, INT_ENB, USBA_END_OF_RESET);
1794         }
1795         spin_unlock_irqrestore(&udc->lock, flags);
1796
1797         return 0;
1798 }
1799
1800 static int atmel_usba_stop(struct usb_gadget *gadget)
1801 {
1802         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1803         unsigned long flags;
1804
1805         if (gpio_is_valid(udc->vbus_pin))
1806                 disable_irq(gpio_to_irq(udc->vbus_pin));
1807
1808         spin_lock_irqsave(&udc->lock, flags);
1809         udc->gadget.speed = USB_SPEED_UNKNOWN;
1810         reset_all_endpoints(udc);
1811         spin_unlock_irqrestore(&udc->lock, flags);
1812
1813         /* This will also disable the DP pullup */
1814         toggle_bias(0);
1815         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1816
1817         clk_disable_unprepare(udc->hclk);
1818         clk_disable_unprepare(udc->pclk);
1819
1820         udc->driver = NULL;
1821
1822         return 0;
1823 }
1824
1825 #ifdef CONFIG_OF
1826 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1827                                                     struct usba_udc *udc)
1828 {
1829         u32 val;
1830         const char *name;
1831         enum of_gpio_flags flags;
1832         struct device_node *np = pdev->dev.of_node;
1833         struct device_node *pp;
1834         int i, ret;
1835         struct usba_ep *eps, *ep;
1836
1837         udc->num_ep = 0;
1838
1839         udc->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1840                                                 &flags);
1841         udc->vbus_pin_inverted = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1842
1843         pp = NULL;
1844         while ((pp = of_get_next_child(np, pp)))
1845                 udc->num_ep++;
1846
1847         eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * udc->num_ep,
1848                            GFP_KERNEL);
1849         if (!eps)
1850                 return ERR_PTR(-ENOMEM);
1851
1852         udc->gadget.ep0 = &eps[0].ep;
1853
1854         INIT_LIST_HEAD(&eps[0].ep.ep_list);
1855
1856         pp = NULL;
1857         i = 0;
1858         while ((pp = of_get_next_child(np, pp))) {
1859                 ep = &eps[i];
1860
1861                 ret = of_property_read_u32(pp, "reg", &val);
1862                 if (ret) {
1863                         dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
1864                         goto err;
1865                 }
1866                 ep->index = val;
1867
1868                 ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
1869                 if (ret) {
1870                         dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
1871                         goto err;
1872                 }
1873                 ep->fifo_size = val;
1874
1875                 ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
1876                 if (ret) {
1877                         dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
1878                         goto err;
1879                 }
1880                 ep->nr_banks = val;
1881
1882                 ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
1883                 ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
1884
1885                 ret = of_property_read_string(pp, "name", &name);
1886                 ep->ep.name = name;
1887
1888                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1889                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1890                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1891                 ep->ep.ops = &usba_ep_ops;
1892                 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
1893                 ep->udc = udc;
1894                 INIT_LIST_HEAD(&ep->queue);
1895
1896                 if (i)
1897                         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1898
1899                 i++;
1900         }
1901
1902         if (i == 0) {
1903                 dev_err(&pdev->dev, "of_probe: no endpoint specified\n");
1904                 ret = -EINVAL;
1905                 goto err;
1906         }
1907
1908         return eps;
1909 err:
1910         return ERR_PTR(ret);
1911 }
1912 #else
1913 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1914                                                     struct usba_udc *udc)
1915 {
1916         return ERR_PTR(-ENOSYS);
1917 }
1918 #endif
1919
1920 static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
1921                                                  struct usba_udc *udc)
1922 {
1923         struct usba_platform_data *pdata = dev_get_platdata(&pdev->dev);
1924         struct usba_ep *eps;
1925         int i;
1926
1927         if (!pdata)
1928                 return ERR_PTR(-ENXIO);
1929
1930         eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * pdata->num_ep,
1931                            GFP_KERNEL);
1932         if (!eps)
1933                 return ERR_PTR(-ENOMEM);
1934
1935         udc->gadget.ep0 = &eps[0].ep;
1936
1937         udc->vbus_pin = pdata->vbus_pin;
1938         udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
1939         udc->num_ep = pdata->num_ep;
1940
1941         INIT_LIST_HEAD(&eps[0].ep.ep_list);
1942
1943         for (i = 0; i < pdata->num_ep; i++) {
1944                 struct usba_ep *ep = &eps[i];
1945
1946                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1947                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1948                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
1949                 ep->ep.ops = &usba_ep_ops;
1950                 ep->ep.name = pdata->ep[i].name;
1951                 ep->fifo_size = pdata->ep[i].fifo_size;
1952                 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
1953                 ep->udc = udc;
1954                 INIT_LIST_HEAD(&ep->queue);
1955                 ep->nr_banks = pdata->ep[i].nr_banks;
1956                 ep->index = pdata->ep[i].index;
1957                 ep->can_dma = pdata->ep[i].can_dma;
1958                 ep->can_isoc = pdata->ep[i].can_isoc;
1959
1960                 if (i)
1961                         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
1962         }
1963
1964         return eps;
1965 }
1966
1967 static int usba_udc_probe(struct platform_device *pdev)
1968 {
1969         struct resource *regs, *fifo;
1970         struct clk *pclk, *hclk;
1971         struct usba_udc *udc;
1972         int irq, ret, i;
1973
1974         udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
1975         if (!udc)
1976                 return -ENOMEM;
1977
1978         udc->gadget = usba_gadget_template;
1979         INIT_LIST_HEAD(&udc->gadget.ep_list);
1980
1981         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
1982         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
1983         if (!regs || !fifo)
1984                 return -ENXIO;
1985
1986         irq = platform_get_irq(pdev, 0);
1987         if (irq < 0)
1988                 return irq;
1989
1990         pclk = devm_clk_get(&pdev->dev, "pclk");
1991         if (IS_ERR(pclk))
1992                 return PTR_ERR(pclk);
1993         hclk = devm_clk_get(&pdev->dev, "hclk");
1994         if (IS_ERR(hclk))
1995                 return PTR_ERR(hclk);
1996
1997         spin_lock_init(&udc->lock);
1998         udc->pdev = pdev;
1999         udc->pclk = pclk;
2000         udc->hclk = hclk;
2001         udc->vbus_pin = -ENODEV;
2002
2003         ret = -ENOMEM;
2004         udc->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2005         if (!udc->regs) {
2006                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
2007                 return ret;
2008         }
2009         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
2010                  (unsigned long)regs->start, udc->regs);
2011         udc->fifo = devm_ioremap(&pdev->dev, fifo->start, resource_size(fifo));
2012         if (!udc->fifo) {
2013                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
2014                 return ret;
2015         }
2016         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
2017                  (unsigned long)fifo->start, udc->fifo);
2018
2019         platform_set_drvdata(pdev, udc);
2020
2021         /* Make sure we start from a clean slate */
2022         ret = clk_prepare_enable(pclk);
2023         if (ret) {
2024                 dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
2025                 return ret;
2026         }
2027         toggle_bias(0);
2028         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2029         clk_disable_unprepare(pclk);
2030
2031         if (pdev->dev.of_node)
2032                 udc->usba_ep = atmel_udc_of_init(pdev, udc);
2033         else
2034                 udc->usba_ep = usba_udc_pdata(pdev, udc);
2035
2036         if (IS_ERR(udc->usba_ep))
2037                 return PTR_ERR(udc->usba_ep);
2038
2039         ret = devm_request_irq(&pdev->dev, irq, usba_udc_irq, 0,
2040                                 "atmel_usba_udc", udc);
2041         if (ret) {
2042                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2043                         irq, ret);
2044                 return ret;
2045         }
2046         udc->irq = irq;
2047
2048         if (gpio_is_valid(udc->vbus_pin)) {
2049                 if (!devm_gpio_request(&pdev->dev, udc->vbus_pin, "atmel_usba_udc")) {
2050                         ret = devm_request_irq(&pdev->dev,
2051                                         gpio_to_irq(udc->vbus_pin),
2052                                         usba_vbus_irq, 0,
2053                                         "atmel_usba_udc", udc);
2054                         if (ret) {
2055                                 udc->vbus_pin = -ENODEV;
2056                                 dev_warn(&udc->pdev->dev,
2057                                          "failed to request vbus irq; "
2058                                          "assuming always on\n");
2059                         } else {
2060                                 disable_irq(gpio_to_irq(udc->vbus_pin));
2061                         }
2062                 } else {
2063                         /* gpio_request fail so use -EINVAL for gpio_is_valid */
2064                         udc->vbus_pin = -EINVAL;
2065                 }
2066         }
2067
2068         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2069         if (ret)
2070                 return ret;
2071
2072         usba_init_debugfs(udc);
2073         for (i = 1; i < udc->num_ep; i++)
2074                 usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2075
2076         return 0;
2077 }
2078
2079 static int __exit usba_udc_remove(struct platform_device *pdev)
2080 {
2081         struct usba_udc *udc;
2082         int i;
2083
2084         udc = platform_get_drvdata(pdev);
2085
2086         usb_del_gadget_udc(&udc->gadget);
2087
2088         for (i = 1; i < udc->num_ep; i++)
2089                 usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2090         usba_cleanup_debugfs(udc);
2091
2092         return 0;
2093 }
2094
2095 #if defined(CONFIG_OF)
2096 static const struct of_device_id atmel_udc_dt_ids[] = {
2097         { .compatible = "atmel,at91sam9rl-udc" },
2098         { /* sentinel */ }
2099 };
2100
2101 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
2102 #endif
2103
2104 static struct platform_driver udc_driver = {
2105         .remove         = __exit_p(usba_udc_remove),
2106         .driver         = {
2107                 .name           = "atmel_usba_udc",
2108                 .of_match_table = of_match_ptr(atmel_udc_dt_ids),
2109         },
2110 };
2111
2112 module_platform_driver_probe(udc_driver, usba_udc_probe);
2113
2114 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2115 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2116 MODULE_LICENSE("GPL");
2117 MODULE_ALIAS("platform:atmel_usba_udc");