kernel/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/clk/at91_pmc.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <linux/slab.h>
  17 #include <linux/device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/list.h>
  20 #include <linux/mfd/syscon.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regmap.h>
  23 #include <linux/usb/ch9.h>
  24 #include <linux/usb/gadget.h>
  25 #include <linux/usb/atmel_usba_udc.h>
  26 #include <linux/delay.h>
  27 #include <linux/of.h>
  28 #include <linux/of_gpio.h>
  29
  30 #include <asm/gpio.h>
  31
  32 #include "atmel_usba_udc.h"
  33
  34 #ifdef CONFIG_USB_GADGET_DEBUG_FS
  35 #include <linux/debugfs.h>
  36 #include <linux/uaccess.h>
  37
  38 static int queue_dbg_open(struct inode *inode, struct file *file)
  39 {
  40         struct usba_ep *ep = inode->i_private;
  41         struct usba_request *req, *req_copy;
  42         struct list_head *queue_data;
  43
  44         queue_data = kmalloc(sizeof(*queue_data), GFP_KERNEL);
  45         if (!queue_data)
  46                 return -ENOMEM;
  47         INIT_LIST_HEAD(queue_data);
  48
  49         spin_lock_irq(&ep->udc->lock);
  50         list_for_each_entry(req, &ep->queue, queue) {
  51                 req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
  52                 if (!req_copy)
  53                         goto fail;
  54                 list_add_tail(&req_copy->queue, queue_data);
  55         }
  56         spin_unlock_irq(&ep->udc->lock);
  57
  58         file->private_data = queue_data;
  59         return 0;
  60
  61 fail:
  62         spin_unlock_irq(&ep->udc->lock);
  63         list_for_each_entry_safe(req, req_copy, queue_data, queue) {
  64                 list_del(&req->queue);
  65                 kfree(req);
  66         }
  67         kfree(queue_data);
  68         return -ENOMEM;
  69 }
  70
  71 /*
  72  * bbbbbbbb llllllll IZS sssss nnnn FDL\n\0
  73  *
  74  * b: buffer address
  75  * l: buffer length
  76  * I/i: interrupt/no interrupt
  77  * Z/z: zero/no zero
  78  * S/s: short ok/short not ok
  79  * s: status
  80  * n: nr_packets
  81  * F/f: submitted/not submitted to FIFO
  82  * D/d: using/not using DMA
  83  * L/l: last transaction/not last transaction
  84  */
  85 static ssize_t queue_dbg_read(struct file *file, char __user *buf,
  86                 size_t nbytes, loff_t *ppos)
  87 {
  88         struct list_head *queue = file->private_data;
  89         struct usba_request *req, *tmp_req;
  90         size_t len, remaining, actual = 0;
  91         char tmpbuf[38];
  92
  93         if (!access_ok(VERIFY_WRITE, buf, nbytes))
  94                 return -EFAULT;
  95
  96         mutex_lock(&file_inode(file)->i_mutex);
  97         list_for_each_entry_safe(req, tmp_req, queue, queue) {
  98                 len = snprintf(tmpbuf, sizeof(tmpbuf),
  99                                 "%8p %08x %c%c%c %5d %c%c%c\n",
 100                                 req->req.buf, req->req.length,
 101                                 req->req.no_interrupt ? 'i' : 'I',
 102                                 req->req.zero ? 'Z' : 'z',
 103                                 req->req.short_not_ok ? 's' : 'S',
 104                                 req->req.status,
 105                                 req->submitted ? 'F' : 'f',
 106                                 req->using_dma ? 'D' : 'd',
 107                                 req->last_transaction ? 'L' : 'l');
 108                 len = min(len, sizeof(tmpbuf));
 109                 if (len > nbytes)
 110                         break;
 111
 112                 list_del(&req->queue);
 113                 kfree(req);
 114
 115                 remaining = __copy_to_user(buf, tmpbuf, len);
 116                 actual += len - remaining;
 117                 if (remaining)
 118                         break;
 119
 120                 nbytes -= len;
 121                 buf += len;
 122         }
 123         mutex_unlock(&file_inode(file)->i_mutex);
 124
 125         return actual;
 126 }
 127
 128 static int queue_dbg_release(struct inode *inode, struct file *file)
 129 {
 130         struct list_head *queue_data = file->private_data;
 131         struct usba_request *req, *tmp_req;
 132
 133         list_for_each_entry_safe(req, tmp_req, queue_data, queue) {
 134                 list_del(&req->queue);
 135                 kfree(req);
 136         }
 137         kfree(queue_data);
 138         return 0;
 139 }
 140
 141 static int regs_dbg_open(struct inode *inode, struct file *file)
 142 {
 143         struct usba_udc *udc;
 144         unsigned int i;
 145         u32 *data;
 146         int ret = -ENOMEM;
 147
 148         mutex_lock(&inode->i_mutex);
 149         udc = inode->i_private;
 150         data = kmalloc(inode->i_size, GFP_KERNEL);
 151         if (!data)
 152                 goto out;
 153
 154         spin_lock_irq(&udc->lock);
 155         for (i = 0; i < inode->i_size / 4; i++)
 156                 data[i] = usba_io_readl(udc->regs + i * 4);
 157         spin_unlock_irq(&udc->lock);
 158
 159         file->private_data = data;
 160         ret = 0;
 161
 162 out:
 163         mutex_unlock(&inode->i_mutex);
 164
 165         return ret;
 166 }
 167
 168 static ssize_t regs_dbg_read(struct file *file, char __user *buf,
 169                 size_t nbytes, loff_t *ppos)
 170 {
 171         struct inode *inode = file_inode(file);
 172         int ret;
 173
 174         mutex_lock(&inode->i_mutex);
 175         ret = simple_read_from_buffer(buf, nbytes, ppos,
 176                         file->private_data,
 177                         file_inode(file)->i_size);
 178         mutex_unlock(&inode->i_mutex);
 179
 180         return ret;
 181 }
 182
 183 static int regs_dbg_release(struct inode *inode, struct file *file)
 184 {
 185         kfree(file->private_data);
 186         return 0;
 187 }
 188
 189 const struct file_operations queue_dbg_fops = {
 190         .owner          = THIS_MODULE,
 191         .open           = queue_dbg_open,
 192         .llseek         = no_llseek,
 193         .read           = queue_dbg_read,
 194         .release        = queue_dbg_release,
 195 };
 196
 197 const struct file_operations regs_dbg_fops = {
 198         .owner          = THIS_MODULE,
 199         .open           = regs_dbg_open,
 200         .llseek         = generic_file_llseek,
 201         .read           = regs_dbg_read,
 202         .release        = regs_dbg_release,
 203 };
 204
 205 static void usba_ep_init_debugfs(struct usba_udc *udc,
 206                 struct usba_ep *ep)
 207 {
 208         struct dentry *ep_root;
 209
 210         ep_root = debugfs_create_dir(ep->ep.name, udc->debugfs_root);
 211         if (!ep_root)
 212                 goto err_root;
 213         ep->debugfs_dir = ep_root;
 214
 215         ep->debugfs_queue = debugfs_create_file("queue", 0400, ep_root,
 216                                                 ep, &queue_dbg_fops);
 217         if (!ep->debugfs_queue)
 218                 goto err_queue;
 219
 220         if (ep->can_dma) {
 221                 ep->debugfs_dma_status
 222                         = debugfs_create_u32("dma_status", 0400, ep_root,
 223                                         &ep->last_dma_status);
 224                 if (!ep->debugfs_dma_status)
 225                         goto err_dma_status;
 226         }
 227         if (ep_is_control(ep)) {
 228                 ep->debugfs_state
 229                         = debugfs_create_u32("state", 0400, ep_root,
 230                                         &ep->state);
 231                 if (!ep->debugfs_state)
 232                         goto err_state;
 233         }
 234
 235         return;
 236
 237 err_state:
 238         if (ep->can_dma)
 239                 debugfs_remove(ep->debugfs_dma_status);
 240 err_dma_status:
 241         debugfs_remove(ep->debugfs_queue);
 242 err_queue:
 243         debugfs_remove(ep_root);
 244 err_root:
 245         dev_err(&ep->udc->pdev->dev,
 246                 "failed to create debugfs directory for %s\n", ep->ep.name);
 247 }
 248
 249 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 250 {
 251         debugfs_remove(ep->debugfs_queue);
 252         debugfs_remove(ep->debugfs_dma_status);
 253         debugfs_remove(ep->debugfs_state);
 254         debugfs_remove(ep->debugfs_dir);
 255         ep->debugfs_dma_status = NULL;
 256         ep->debugfs_dir = NULL;
 257 }
 258
 259 static void usba_init_debugfs(struct usba_udc *udc)
 260 {
 261         struct dentry *root, *regs;
 262         struct resource *regs_resource;
 263
 264         root = debugfs_create_dir(udc->gadget.name, NULL);
 265         if (IS_ERR(root) || !root)
 266                 goto err_root;
 267         udc->debugfs_root = root;
 268
 269         regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
 270                                 CTRL_IOMEM_ID);
 271
 272         if (regs_resource) {
 273                 regs = debugfs_create_file_size("regs", 0400, root, udc,
 274                                                 &regs_dbg_fops,
 275                                                 resource_size(regs_resource));
 276                 if (!regs)
 277                         goto err_regs;
 278                 udc->debugfs_regs = regs;
 279         }
 280
 281         usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
 282
 283         return;
 284
 285 err_regs:
 286         debugfs_remove(root);
 287 err_root:
 288         udc->debugfs_root = NULL;
 289         dev_err(&udc->pdev->dev, "debugfs is not available\n");
 290 }
 291
 292 static void usba_cleanup_debugfs(struct usba_udc *udc)
 293 {
 294         usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
 295         debugfs_remove(udc->debugfs_regs);
 296         debugfs_remove(udc->debugfs_root);
 297         udc->debugfs_regs = NULL;
 298         udc->debugfs_root = NULL;
 299 }
 300 #else
 301 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
 302                                          struct usba_ep *ep)
 303 {
 304
 305 }
 306
 307 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 308 {
 309
 310 }
 311
 312 static inline void usba_init_debugfs(struct usba_udc *udc)
 313 {
 314
 315 }
 316
 317 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
 318 {
 319
 320 }
 321 #endif
 322
 323 static inline u32 usba_int_enb_get(struct usba_udc *udc)
 324 {
 325         return udc->int_enb_cache;
 326 }
 327
 328 static inline void usba_int_enb_set(struct usba_udc *udc, u32 val)
 329 {
 330         usba_writel(udc, INT_ENB, val);
 331         udc->int_enb_cache = val;
 332 }
 333
 334 static int vbus_is_present(struct usba_udc *udc)
 335 {
 336         if (gpio_is_valid(udc->vbus_pin))
 337                 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
 338
 339         /* No Vbus detection: Assume always present */
 340         return 1;
 341 }
 342
 343 static void toggle_bias(struct usba_udc *udc, int is_on)
 344 {
 345         if (udc->errata && udc->errata->toggle_bias)
 346                 udc->errata->toggle_bias(udc, is_on);
 347 }
 348
 349 static void generate_bias_pulse(struct usba_udc *udc)
 350 {
 351         if (!udc->bias_pulse_needed)
 352                 return;
 353
 354         if (udc->errata && udc->errata->pulse_bias)
 355                 udc->errata->pulse_bias(udc);
 356
 357         udc->bias_pulse_needed = false;
 358 }
 359
 360 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 361 {
 362         unsigned int transaction_len;
 363
 364         transaction_len = req->req.length - req->req.actual;
 365         req->last_transaction = 1;
 366         if (transaction_len > ep->ep.maxpacket) {
 367                 transaction_len = ep->ep.maxpacket;
 368                 req->last_transaction = 0;
 369         } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
 370                 req->last_transaction = 0;
 371
 372         DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
 373                 ep->ep.name, req, transaction_len,
 374                 req->last_transaction ? ", done" : "");
 375
 376         memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
 377         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 378         req->req.actual += transaction_len;
 379 }
 380
 381 static void submit_request(struct usba_ep *ep, struct usba_request *req)
 382 {
 383         DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
 384                 ep->ep.name, req, req->req.length);
 385
 386         req->req.actual = 0;
 387         req->submitted = 1;
 388
 389         if (req->using_dma) {
 390                 if (req->req.length == 0) {
 391                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 392                         return;
 393                 }
 394
 395                 if (req->req.zero)
 396                         usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
 397                 else
 398                         usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
 399
 400                 usba_dma_writel(ep, ADDRESS, req->req.dma);
 401                 usba_dma_writel(ep, CONTROL, req->ctrl);
 402         } else {
 403                 next_fifo_transaction(ep, req);
 404                 if (req->last_transaction) {
 405                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
 406                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 407                 } else {
 408                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
 409                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 410                 }
 411         }
 412 }
 413
 414 static void submit_next_request(struct usba_ep *ep)
 415 {
 416         struct usba_request *req;
 417
 418         if (list_empty(&ep->queue)) {
 419                 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
 420                 return;
 421         }
 422
 423         req = list_entry(ep->queue.next, struct usba_request, queue);
 424         if (!req->submitted)
 425                 submit_request(ep, req);
 426 }
 427
 428 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
 429 {
 430         ep->state = STATUS_STAGE_IN;
 431         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 432         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 433 }
 434
 435 static void receive_data(struct usba_ep *ep)
 436 {
 437         struct usba_udc *udc = ep->udc;
 438         struct usba_request *req;
 439         unsigned long status;
 440         unsigned int bytecount, nr_busy;
 441         int is_complete = 0;
 442
 443         status = usba_ep_readl(ep, STA);
 444         nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 445
 446         DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
 447
 448         while (nr_busy > 0) {
 449                 if (list_empty(&ep->queue)) {
 450                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 451                         break;
 452                 }
 453                 req = list_entry(ep->queue.next,
 454                                  struct usba_request, queue);
 455
 456                 bytecount = USBA_BFEXT(BYTE_COUNT, status);
 457
 458                 if (status & (1 << 31))
 459                         is_complete = 1;
 460                 if (req->req.actual + bytecount >= req->req.length) {
 461                         is_complete = 1;
 462                         bytecount = req->req.length - req->req.actual;
 463                 }
 464
 465                 memcpy_fromio(req->req.buf + req->req.actual,
 466                                 ep->fifo, bytecount);
 467                 req->req.actual += bytecount;
 468
 469                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
 470
 471                 if (is_complete) {
 472                         DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
 473                         req->req.status = 0;
 474                         list_del_init(&req->queue);
 475                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 476                         spin_unlock(&udc->lock);
 477                         usb_gadget_giveback_request(&ep->ep, &req->req);
 478                         spin_lock(&udc->lock);
 479                 }
 480
 481                 status = usba_ep_readl(ep, STA);
 482                 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 483
 484                 if (is_complete && ep_is_control(ep)) {
 485                         send_status(udc, ep);
 486                         break;
 487                 }
 488         }
 489 }
 490
 491 static void
 492 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
 493 {
 494         struct usba_udc *udc = ep->udc;
 495
 496         WARN_ON(!list_empty(&req->queue));
 497
 498         if (req->req.status == -EINPROGRESS)
 499                 req->req.status = status;
 500
 501         if (req->using_dma)
 502                 usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
 503
 504         DBG(DBG_GADGET | DBG_REQ,
 505                 "%s: req %p complete: status %d, actual %u\n",
 506                 ep->ep.name, req, req->req.status, req->req.actual);
 507
 508         spin_unlock(&udc->lock);
 509         usb_gadget_giveback_request(&ep->ep, &req->req);
 510         spin_lock(&udc->lock);
 511 }
 512
 513 static void
 514 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
 515 {
 516         struct usba_request *req, *tmp_req;
 517
 518         list_for_each_entry_safe(req, tmp_req, list, queue) {
 519                 list_del_init(&req->queue);
 520                 request_complete(ep, req, status);
 521         }
 522 }
 523
 524 static int
 525 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 526 {
 527         struct usba_ep *ep = to_usba_ep(_ep);
 528         struct usba_udc *udc = ep->udc;
 529         unsigned long flags, ept_cfg, maxpacket;
 530         unsigned int nr_trans;
 531
 532         DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
 533
 534         maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
 535
 536         if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
 537                         || ep->index == 0
 538                         || desc->bDescriptorType != USB_DT_ENDPOINT
 539                         || maxpacket == 0
 540                         || maxpacket > ep->fifo_size) {
 541                 DBG(DBG_ERR, "ep_enable: Invalid argument");
 542                 return -EINVAL;
 543         }
 544
 545         ep->is_isoc = 0;
 546         ep->is_in = 0;
 547
 548         if (maxpacket <= 8)
 549                 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
 550         else
 551                 /* LSB is bit 1, not 0 */
 552                 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
 553
 554         DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
 555                         ep->ep.name, ept_cfg, maxpacket);
 556
 557         if (usb_endpoint_dir_in(desc)) {
 558                 ep->is_in = 1;
 559                 ept_cfg |= USBA_EPT_DIR_IN;
 560         }
 561
 562         switch (usb_endpoint_type(desc)) {
 563         case USB_ENDPOINT_XFER_CONTROL:
 564                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 565                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
 566                 break;
 567         case USB_ENDPOINT_XFER_ISOC:
 568                 if (!ep->can_isoc) {
 569                         DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
 570                                         ep->ep.name);
 571                         return -EINVAL;
 572                 }
 573
 574                 /*
 575                  * Bits 11:12 specify number of _additional_
 576                  * transactions per microframe.
 577                  */
 578                 nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
 579                 if (nr_trans > 3)
 580                         return -EINVAL;
 581
 582                 ep->is_isoc = 1;
 583                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 584
 585                 /*
 586                  * Do triple-buffering on high-bandwidth iso endpoints.
 587                  */
 588                 if (nr_trans > 1 && ep->nr_banks == 3)
 589                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
 590                 else
 591                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 592                 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 593                 break;
 594         case USB_ENDPOINT_XFER_BULK:
 595                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 596                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 597                 break;
 598         case USB_ENDPOINT_XFER_INT:
 599                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 600                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 601                 break;
 602         }
 603
 604         spin_lock_irqsave(&ep->udc->lock, flags);
 605
 606         ep->ep.desc = desc;
 607         ep->ep.maxpacket = maxpacket;
 608
 609         usba_ep_writel(ep, CFG, ept_cfg);
 610         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 611
 612         if (ep->can_dma) {
 613                 u32 ctrl;
 614
 615                 usba_int_enb_set(udc, usba_int_enb_get(udc) |
 616                                       USBA_BF(EPT_INT, 1 << ep->index) |
 617                                       USBA_BF(DMA_INT, 1 << ep->index));
 618                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 619                 usba_ep_writel(ep, CTL_ENB, ctrl);
 620         } else {
 621                 usba_int_enb_set(udc, usba_int_enb_get(udc) |
 622                                       USBA_BF(EPT_INT, 1 << ep->index));
 623         }
 624
 625         spin_unlock_irqrestore(&udc->lock, flags);
 626
 627         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 628                         (unsigned long)usba_ep_readl(ep, CFG));
 629         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 630                         (unsigned long)usba_int_enb_get(udc));
 631
 632         return 0;
 633 }
 634
 635 static int usba_ep_disable(struct usb_ep *_ep)
 636 {
 637         struct usba_ep *ep = to_usba_ep(_ep);
 638         struct usba_udc *udc = ep->udc;
 639         LIST_HEAD(req_list);
 640         unsigned long flags;
 641
 642         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 643
 644         spin_lock_irqsave(&udc->lock, flags);
 645
 646         if (!ep->ep.desc) {
 647                 spin_unlock_irqrestore(&udc->lock, flags);
 648                 /* REVISIT because this driver disables endpoints in
 649                  * reset_all_endpoints() before calling disconnect(),
 650                  * most gadget drivers would trigger this non-error ...
 651                  */
 652                 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
 653                         DBG(DBG_ERR, "ep_disable: %s not enabled\n",
 654                                         ep->ep.name);
 655                 return -EINVAL;
 656         }
 657         ep->ep.desc = NULL;
 658
 659         list_splice_init(&ep->queue, &req_list);
 660         if (ep->can_dma) {
 661                 usba_dma_writel(ep, CONTROL, 0);
 662                 usba_dma_writel(ep, ADDRESS, 0);
 663                 usba_dma_readl(ep, STATUS);
 664         }
 665         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 666         usba_int_enb_set(udc, usba_int_enb_get(udc) &
 667                               ~USBA_BF(EPT_INT, 1 << ep->index));
 668
 669         request_complete_list(ep, &req_list, -ESHUTDOWN);
 670
 671         spin_unlock_irqrestore(&udc->lock, flags);
 672
 673         return 0;
 674 }
 675
 676 static struct usb_request *
 677 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 678 {
 679         struct usba_request *req;
 680
 681         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 682
 683         req = kzalloc(sizeof(*req), gfp_flags);
 684         if (!req)
 685                 return NULL;
 686
 687         INIT_LIST_HEAD(&req->queue);
 688
 689         return &req->req;
 690 }
 691
 692 static void
 693 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 694 {
 695         struct usba_request *req = to_usba_req(_req);
 696
 697         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 698
 699         kfree(req);
 700 }
 701
 702 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 703                 struct usba_request *req, gfp_t gfp_flags)
 704 {
 705         unsigned long flags;
 706         int ret;
 707
 708         DBG(DBG_DMA, "%s: req l/%u d/%pad %c%c%c\n",
 709                 ep->ep.name, req->req.length, &req->req.dma,
 710                 req->req.zero ? 'Z' : 'z',
 711                 req->req.short_not_ok ? 'S' : 's',
 712                 req->req.no_interrupt ? 'I' : 'i');
 713
 714         if (req->req.length > 0x10000) {
 715                 /* Lengths from 0 to 65536 (inclusive) are supported */
 716                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 717                 return -EINVAL;
 718         }
 719
 720         ret = usb_gadget_map_request(&udc->gadget, &req->req, ep->is_in);
 721         if (ret)
 722                 return ret;
 723
 724         req->using_dma = 1;
 725         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 726                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 727                         | USBA_DMA_END_BUF_EN;
 728
 729         if (!ep->is_in)
 730                 req->ctrl |= USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 731
 732         /*
 733          * Add this request to the queue and submit for DMA if
 734          * possible. Check if we're still alive first -- we may have
 735          * received a reset since last time we checked.
 736          */
 737         ret = -ESHUTDOWN;
 738         spin_lock_irqsave(&udc->lock, flags);
 739         if (ep->ep.desc) {
 740                 if (list_empty(&ep->queue))
 741                         submit_request(ep, req);
 742
 743                 list_add_tail(&req->queue, &ep->queue);
 744                 ret = 0;
 745         }
 746         spin_unlock_irqrestore(&udc->lock, flags);
 747
 748         return ret;
 749 }
 750
 751 static int
 752 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 753 {
 754         struct usba_request *req = to_usba_req(_req);
 755         struct usba_ep *ep = to_usba_ep(_ep);
 756         struct usba_udc *udc = ep->udc;
 757         unsigned long flags;
 758         int ret;
 759
 760         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 761                         ep->ep.name, req, _req->length);
 762
 763         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
 764             !ep->ep.desc)
 765                 return -ESHUTDOWN;
 766
 767         req->submitted = 0;
 768         req->using_dma = 0;
 769         req->last_transaction = 0;
 770
 771         _req->status = -EINPROGRESS;
 772         _req->actual = 0;
 773
 774         if (ep->can_dma)
 775                 return queue_dma(udc, ep, req, gfp_flags);
 776
 777         /* May have received a reset since last time we checked */
 778         ret = -ESHUTDOWN;
 779         spin_lock_irqsave(&udc->lock, flags);
 780         if (ep->ep.desc) {
 781                 list_add_tail(&req->queue, &ep->queue);
 782
 783                 if ((!ep_is_control(ep) && ep->is_in) ||
 784                         (ep_is_control(ep)
 785                                 && (ep->state == DATA_STAGE_IN
 786                                         || ep->state == STATUS_STAGE_IN)))
 787                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 788                 else
 789                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 790                 ret = 0;
 791         }
 792         spin_unlock_irqrestore(&udc->lock, flags);
 793
 794         return ret;
 795 }
 796
 797 static void
 798 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 799 {
 800         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 801 }
 802
 803 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 804 {
 805         unsigned int timeout;
 806         u32 status;
 807
 808         /*
 809          * Stop the DMA controller. When writing both CH_EN
 810          * and LINK to 0, the other bits are not affected.
 811          */
 812         usba_dma_writel(ep, CONTROL, 0);
 813
 814         /* Wait for the FIFO to empty */
 815         for (timeout = 40; timeout; --timeout) {
 816                 status = usba_dma_readl(ep, STATUS);
 817                 if (!(status & USBA_DMA_CH_EN))
 818                         break;
 819                 udelay(1);
 820         }
 821
 822         if (pstatus)
 823                 *pstatus = status;
 824
 825         if (timeout == 0) {
 826                 dev_err(&ep->udc->pdev->dev,
 827                         "%s: timed out waiting for DMA FIFO to empty\n",
 828                         ep->ep.name);
 829                 return -ETIMEDOUT;
 830         }
 831
 832         return 0;
 833 }
 834
 835 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 836 {
 837         struct usba_ep *ep = to_usba_ep(_ep);
 838         struct usba_udc *udc = ep->udc;
 839         struct usba_request *req;
 840         unsigned long flags;
 841         u32 status;
 842
 843         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 844                         ep->ep.name, req);
 845
 846         spin_lock_irqsave(&udc->lock, flags);
 847
 848         list_for_each_entry(req, &ep->queue, queue) {
 849                 if (&req->req == _req)
 850                         break;
 851         }
 852
 853         if (&req->req != _req) {
 854                 spin_unlock_irqrestore(&udc->lock, flags);
 855                 return -EINVAL;
 856         }
 857
 858         if (req->using_dma) {
 859                 /*
 860                  * If this request is currently being transferred,
 861                  * stop the DMA controller and reset the FIFO.
 862                  */
 863                 if (ep->queue.next == &req->queue) {
 864                         status = usba_dma_readl(ep, STATUS);
 865                         if (status & USBA_DMA_CH_EN)
 866                                 stop_dma(ep, &status);
 867
 868 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 869                         ep->last_dma_status = status;
 870 #endif
 871
 872                         usba_writel(udc, EPT_RST, 1 << ep->index);
 873
 874                         usba_update_req(ep, req, status);
 875                 }
 876         }
 877
 878         /*
 879          * Errors should stop the queue from advancing until the
 880          * completion function returns.
 881          */
 882         list_del_init(&req->queue);
 883
 884         request_complete(ep, req, -ECONNRESET);
 885
 886         /* Process the next request if any */
 887         submit_next_request(ep);
 888         spin_unlock_irqrestore(&udc->lock, flags);
 889
 890         return 0;
 891 }
 892
 893 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 894 {
 895         struct usba_ep *ep = to_usba_ep(_ep);
 896         struct usba_udc *udc = ep->udc;
 897         unsigned long flags;
 898         int ret = 0;
 899
 900         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 901                         value ? "set" : "clear");
 902
 903         if (!ep->ep.desc) {
 904                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 905                                 ep->ep.name);
 906                 return -ENODEV;
 907         }
 908         if (ep->is_isoc) {
 909                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 910                                 ep->ep.name);
 911                 return -ENOTTY;
 912         }
 913
 914         spin_lock_irqsave(&udc->lock, flags);
 915
 916         /*
 917          * We can't halt IN endpoints while there are still data to be
 918          * transferred
 919          */
 920         if (!list_empty(&ep->queue)
 921                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 922                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 923                 ret = -EAGAIN;
 924         } else {
 925                 if (value)
 926                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 927                 else
 928                         usba_ep_writel(ep, CLR_STA,
 929                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 930                 usba_ep_readl(ep, STA);
 931         }
 932
 933         spin_unlock_irqrestore(&udc->lock, flags);
 934
 935         return ret;
 936 }
 937
 938 static int usba_ep_fifo_status(struct usb_ep *_ep)
 939 {
 940         struct usba_ep *ep = to_usba_ep(_ep);
 941
 942         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 943 }
 944
 945 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 946 {
 947         struct usba_ep *ep = to_usba_ep(_ep);
 948         struct usba_udc *udc = ep->udc;
 949
 950         usba_writel(udc, EPT_RST, 1 << ep->index);
 951 }
 952
 953 static const struct usb_ep_ops usba_ep_ops = {
 954         .enable         = usba_ep_enable,
 955         .disable        = usba_ep_disable,
 956         .alloc_request  = usba_ep_alloc_request,
 957         .free_request   = usba_ep_free_request,
 958         .queue          = usba_ep_queue,
 959         .dequeue        = usba_ep_dequeue,
 960         .set_halt       = usba_ep_set_halt,
 961         .fifo_status    = usba_ep_fifo_status,
 962         .fifo_flush     = usba_ep_fifo_flush,
 963 };
 964
 965 static int usba_udc_get_frame(struct usb_gadget *gadget)
 966 {
 967         struct usba_udc *udc = to_usba_udc(gadget);
 968
 969         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 970 }
 971
 972 static int usba_udc_wakeup(struct usb_gadget *gadget)
 973 {
 974         struct usba_udc *udc = to_usba_udc(gadget);
 975         unsigned long flags;
 976         u32 ctrl;
 977         int ret = -EINVAL;
 978
 979         spin_lock_irqsave(&udc->lock, flags);
 980         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 981                 ctrl = usba_readl(udc, CTRL);
 982                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 983                 ret = 0;
 984         }
 985         spin_unlock_irqrestore(&udc->lock, flags);
 986
 987         return ret;
 988 }
 989
 990 static int
 991 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 992 {
 993         struct usba_udc *udc = to_usba_udc(gadget);
 994         unsigned long flags;
 995
 996         gadget->is_selfpowered = (is_selfpowered != 0);
 997         spin_lock_irqsave(&udc->lock, flags);
 998         if (is_selfpowered)
 999                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1000         else
1001                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1002         spin_unlock_irqrestore(&udc->lock, flags);
1003
1004         return 0;
1005 }
1006
1007 static int atmel_usba_start(struct usb_gadget *gadget,
1008                 struct usb_gadget_driver *driver);
1009 static int atmel_usba_stop(struct usb_gadget *gadget);
1010
1011 static const struct usb_gadget_ops usba_udc_ops = {
1012         .get_frame              = usba_udc_get_frame,
1013         .wakeup                 = usba_udc_wakeup,
1014         .set_selfpowered        = usba_udc_set_selfpowered,
1015         .udc_start              = atmel_usba_start,
1016         .udc_stop               = atmel_usba_stop,
1017 };
1018
1019 static struct usb_endpoint_descriptor usba_ep0_desc = {
1020         .bLength = USB_DT_ENDPOINT_SIZE,
1021         .bDescriptorType = USB_DT_ENDPOINT,
1022         .bEndpointAddress = 0,
1023         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1024         .wMaxPacketSize = cpu_to_le16(64),
1025         /* FIXME: I have no idea what to put here */
1026         .bInterval = 1,
1027 };
1028
1029 static struct usb_gadget usba_gadget_template = {
1030         .ops            = &usba_udc_ops,
1031         .max_speed      = USB_SPEED_HIGH,
1032         .name           = "atmel_usba_udc",
1033 };
1034
1035 /*
1036  * Called with interrupts disabled and udc->lock held.
1037  */
1038 static void reset_all_endpoints(struct usba_udc *udc)
1039 {
1040         struct usba_ep *ep;
1041         struct usba_request *req, *tmp_req;
1042
1043         usba_writel(udc, EPT_RST, ~0UL);
1044
1045         ep = to_usba_ep(udc->gadget.ep0);
1046         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1047                 list_del_init(&req->queue);
1048                 request_complete(ep, req, -ECONNRESET);
1049         }
1050
1051         /* NOTE:  normally, the next call to the gadget driver is in
1052          * charge of disabling endpoints... usually disconnect().
1053          * The exception would be entering a high speed test mode.
1054          *
1055          * FIXME remove this code ... and retest thoroughly.
1056          */
1057         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1058                 if (ep->ep.desc) {
1059                         spin_unlock(&udc->lock);
1060                         usba_ep_disable(&ep->ep);
1061                         spin_lock(&udc->lock);
1062                 }
1063         }
1064 }
1065
1066 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1067 {
1068         struct usba_ep *ep;
1069
1070         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1071                 return to_usba_ep(udc->gadget.ep0);
1072
1073         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1074                 u8 bEndpointAddress;
1075
1076                 if (!ep->ep.desc)
1077                         continue;
1078                 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1079                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1080                         continue;
1081                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1082                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1083                         return ep;
1084         }
1085
1086         return NULL;
1087 }
1088
1089 /* Called with interrupts disabled and udc->lock held */
1090 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1091 {
1092         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1093         ep->state = WAIT_FOR_SETUP;
1094 }
1095
1096 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1097 {
1098         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1099                 return 1;
1100         return 0;
1101 }
1102
1103 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1104 {
1105         u32 regval;
1106
1107         DBG(DBG_BUS, "setting address %u...\n", addr);
1108         regval = usba_readl(udc, CTRL);
1109         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1110         usba_writel(udc, CTRL, regval);
1111 }
1112
1113 static int do_test_mode(struct usba_udc *udc)
1114 {
1115         static const char test_packet_buffer[] = {
1116                 /* JKJKJKJK * 9 */
1117                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1118                 /* JJKKJJKK * 8 */
1119                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1120                 /* JJKKJJKK * 8 */
1121                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1122                 /* JJJJJJJKKKKKKK * 8 */
1123                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1124                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1125                 /* JJJJJJJK * 8 */
1126                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1127                 /* {JKKKKKKK * 10}, JK */
1128                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1129         };
1130         struct usba_ep *ep;
1131         struct device *dev = &udc->pdev->dev;
1132         int test_mode;
1133
1134         test_mode = udc->test_mode;
1135
1136         /* Start from a clean slate */
1137         reset_all_endpoints(udc);
1138
1139         switch (test_mode) {
1140         case 0x0100:
1141                 /* Test_J */
1142                 usba_writel(udc, TST, USBA_TST_J_MODE);
1143                 dev_info(dev, "Entering Test_J mode...\n");
1144                 break;
1145         case 0x0200:
1146                 /* Test_K */
1147                 usba_writel(udc, TST, USBA_TST_K_MODE);
1148                 dev_info(dev, "Entering Test_K mode...\n");
1149                 break;
1150         case 0x0300:
1151                 /*
1152                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1153                  * for Bulk IN transfers
1154                  */
1155                 ep = &udc->usba_ep[0];
1156                 usba_writel(udc, TST,
1157                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1158                 usba_ep_writel(ep, CFG,
1159                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1160                                 | USBA_EPT_DIR_IN
1161                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1162                                 | USBA_BF(BK_NUMBER, 1));
1163                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1164                         set_protocol_stall(udc, ep);
1165                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1166                 } else {
1167                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1168                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1169                 }
1170                 break;
1171         case 0x0400:
1172                 /* Test_Packet */
1173                 ep = &udc->usba_ep[0];
1174                 usba_ep_writel(ep, CFG,
1175                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1176                                 | USBA_EPT_DIR_IN
1177                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1178                                 | USBA_BF(BK_NUMBER, 1));
1179                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1180                         set_protocol_stall(udc, ep);
1181                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1182                 } else {
1183                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1184                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1185                         memcpy_toio(ep->fifo, test_packet_buffer,
1186                                         sizeof(test_packet_buffer));
1187                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1188                         dev_info(dev, "Entering Test_Packet mode...\n");
1189                 }
1190                 break;
1191         default:
1192                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1193                 return -EINVAL;
1194         }
1195
1196         return 0;
1197 }
1198
1199 /* Avoid overly long expressions */
1200 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1201 {
1202         if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1203                 return true;
1204         return false;
1205 }
1206
1207 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1208 {
1209         if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1210                 return true;
1211         return false;
1212 }
1213
1214 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1215 {
1216         if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1217                 return true;
1218         return false;
1219 }
1220
1221 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1222                 struct usb_ctrlrequest *crq)
1223 {
1224         int retval = 0;
1225
1226         switch (crq->bRequest) {
1227         case USB_REQ_GET_STATUS: {
1228                 u16 status;
1229
1230                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1231                         status = cpu_to_le16(udc->devstatus);
1232                 } else if (crq->bRequestType
1233                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1234                         status = cpu_to_le16(0);
1235                 } else if (crq->bRequestType
1236                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1237                         struct usba_ep *target;
1238
1239                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1240                         if (!target)
1241                                 goto stall;
1242
1243                         status = 0;
1244                         if (is_stalled(udc, target))
1245                                 status |= cpu_to_le16(1);
1246                 } else
1247                         goto delegate;
1248
1249                 /* Write directly to the FIFO. No queueing is done. */
1250                 if (crq->wLength != cpu_to_le16(sizeof(status)))
1251                         goto stall;
1252                 ep->state = DATA_STAGE_IN;
1253                 usba_io_writew(status, ep->fifo);
1254                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1255                 break;
1256         }
1257
1258         case USB_REQ_CLEAR_FEATURE: {
1259                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1260                         if (feature_is_dev_remote_wakeup(crq))
1261                                 udc->devstatus
1262                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1263                         else
1264                                 /* Can't CLEAR_FEATURE TEST_MODE */
1265                                 goto stall;
1266                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1267                         struct usba_ep *target;
1268
1269                         if (crq->wLength != cpu_to_le16(0)
1270                                         || !feature_is_ep_halt(crq))
1271                                 goto stall;
1272                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1273                         if (!target)
1274                                 goto stall;
1275
1276                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1277                         if (target->index != 0)
1278                                 usba_ep_writel(target, CLR_STA,
1279                                                 USBA_TOGGLE_CLR);
1280                 } else {
1281                         goto delegate;
1282                 }
1283
1284                 send_status(udc, ep);
1285                 break;
1286         }
1287
1288         case USB_REQ_SET_FEATURE: {
1289                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1290                         if (feature_is_dev_test_mode(crq)) {
1291                                 send_status(udc, ep);
1292                                 ep->state = STATUS_STAGE_TEST;
1293                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1294                                 return 0;
1295                         } else if (feature_is_dev_remote_wakeup(crq)) {
1296                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1297                         } else {
1298                                 goto stall;
1299                         }
1300                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1301                         struct usba_ep *target;
1302
1303                         if (crq->wLength != cpu_to_le16(0)
1304                                         || !feature_is_ep_halt(crq))
1305                                 goto stall;
1306
1307                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1308                         if (!target)
1309                                 goto stall;
1310
1311                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1312                 } else
1313                         goto delegate;
1314
1315                 send_status(udc, ep);
1316                 break;
1317         }
1318
1319         case USB_REQ_SET_ADDRESS:
1320                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1321                         goto delegate;
1322
1323                 set_address(udc, le16_to_cpu(crq->wValue));
1324                 send_status(udc, ep);
1325                 ep->state = STATUS_STAGE_ADDR;
1326                 break;
1327
1328         default:
1329 delegate:
1330                 spin_unlock(&udc->lock);
1331                 retval = udc->driver->setup(&udc->gadget, crq);
1332                 spin_lock(&udc->lock);
1333         }
1334
1335         return retval;
1336
1337 stall:
1338         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1339                 "halting endpoint...\n",
1340                 ep->ep.name, crq->bRequestType, crq->bRequest,
1341                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1342                 le16_to_cpu(crq->wLength));
1343         set_protocol_stall(udc, ep);
1344         return -1;
1345 }
1346
1347 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1348 {
1349         struct usba_request *req;
1350         u32 epstatus;
1351         u32 epctrl;
1352
1353 restart:
1354         epstatus = usba_ep_readl(ep, STA);
1355         epctrl = usba_ep_readl(ep, CTL);
1356
1357         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1358                         ep->ep.name, ep->state, epstatus, epctrl);
1359
1360         req = NULL;
1361         if (!list_empty(&ep->queue))
1362                 req = list_entry(ep->queue.next,
1363                                  struct usba_request, queue);
1364
1365         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1366                 if (req->submitted)
1367                         next_fifo_transaction(ep, req);
1368                 else
1369                         submit_request(ep, req);
1370
1371                 if (req->last_transaction) {
1372                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1373                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1374                 }
1375                 goto restart;
1376         }
1377         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1378                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1379
1380                 switch (ep->state) {
1381                 case DATA_STAGE_IN:
1382                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1383                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1384                         ep->state = STATUS_STAGE_OUT;
1385                         break;
1386                 case STATUS_STAGE_ADDR:
1387                         /* Activate our new address */
1388                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1389                                                 | USBA_FADDR_EN));
1390                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1391                         ep->state = WAIT_FOR_SETUP;
1392                         break;
1393                 case STATUS_STAGE_IN:
1394                         if (req) {
1395                                 list_del_init(&req->queue);
1396                                 request_complete(ep, req, 0);
1397                                 submit_next_request(ep);
1398                         }
1399                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1400                         ep->state = WAIT_FOR_SETUP;
1401                         break;
1402                 case STATUS_STAGE_TEST:
1403                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1404                         ep->state = WAIT_FOR_SETUP;
1405                         if (do_test_mode(udc))
1406                                 set_protocol_stall(udc, ep);
1407                         break;
1408                 default:
1409                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1410                                 "halting endpoint...\n",
1411                                 ep->ep.name, ep->state);
1412                         set_protocol_stall(udc, ep);
1413                         break;
1414                 }
1415
1416                 goto restart;
1417         }
1418         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1419                 switch (ep->state) {
1420                 case STATUS_STAGE_OUT:
1421                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1422                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1423
1424                         if (req) {
1425                                 list_del_init(&req->queue);
1426                                 request_complete(ep, req, 0);
1427                         }
1428                         ep->state = WAIT_FOR_SETUP;
1429                         break;
1430
1431                 case DATA_STAGE_OUT:
1432                         receive_data(ep);
1433                         break;
1434
1435                 default:
1436                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1437                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1438                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1439                                 "halting endpoint...\n",
1440                                 ep->ep.name, ep->state);
1441                         set_protocol_stall(udc, ep);
1442                         break;
1443                 }
1444
1445                 goto restart;
1446         }
1447         if (epstatus & USBA_RX_SETUP) {
1448                 union {
1449                         struct usb_ctrlrequest crq;
1450                         unsigned long data[2];
1451                 } crq;
1452                 unsigned int pkt_len;
1453                 int ret;
1454
1455                 if (ep->state != WAIT_FOR_SETUP) {
1456                         /*
1457                          * Didn't expect a SETUP packet at this
1458                          * point. Clean up any pending requests (which
1459                          * may be successful).
1460                          */
1461                         int status = -EPROTO;
1462
1463                         /*
1464                          * RXRDY and TXCOMP are dropped when SETUP
1465                          * packets arrive.  Just pretend we received
1466                          * the status packet.
1467                          */
1468                         if (ep->state == STATUS_STAGE_OUT
1469                                         || ep->state == STATUS_STAGE_IN) {
1470                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1471                                 status = 0;
1472                         }
1473
1474                         if (req) {
1475                                 list_del_init(&req->queue);
1476                                 request_complete(ep, req, status);
1477                         }
1478                 }
1479
1480                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1481                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1482                 if (pkt_len != sizeof(crq)) {
1483                         pr_warning("udc: Invalid packet length %u "
1484                                 "(expected %zu)\n", pkt_len, sizeof(crq));
1485                         set_protocol_stall(udc, ep);
1486                         return;
1487                 }
1488
1489                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1490                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1491
1492                 /* Free up one bank in the FIFO so that we can
1493                  * generate or receive a reply right away. */
1494                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1495
1496                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1497                         ep->state, crq.crq.bRequestType,
1498                         crq.crq.bRequest); */
1499
1500                 if (crq.crq.bRequestType & USB_DIR_IN) {
1501                         /*
1502                          * The USB 2.0 spec states that "if wLength is
1503                          * zero, there is no data transfer phase."
1504                          * However, testusb #14 seems to actually
1505                          * expect a data phase even if wLength = 0...
1506                          */
1507                         ep->state = DATA_STAGE_IN;
1508                 } else {
1509                         if (crq.crq.wLength != cpu_to_le16(0))
1510                                 ep->state = DATA_STAGE_OUT;
1511                         else
1512                                 ep->state = STATUS_STAGE_IN;
1513                 }
1514
1515                 ret = -1;
1516                 if (ep->index == 0)
1517                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1518                 else {
1519                         spin_unlock(&udc->lock);
1520                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1521                         spin_lock(&udc->lock);
1522                 }
1523
1524                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1525                         crq.crq.bRequestType, crq.crq.bRequest,
1526                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1527
1528                 if (ret < 0) {
1529                         /* Let the host know that we failed */
1530                         set_protocol_stall(udc, ep);
1531                 }
1532         }
1533 }
1534
1535 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1536 {
1537         struct usba_request *req;
1538         u32 epstatus;
1539         u32 epctrl;
1540
1541         epstatus = usba_ep_readl(ep, STA);
1542         epctrl = usba_ep_readl(ep, CTL);
1543
1544         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1545
1546         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1547                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1548
1549                 if (list_empty(&ep->queue)) {
1550                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1551                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1552                         return;
1553                 }
1554
1555                 req = list_entry(ep->queue.next, struct usba_request, queue);
1556
1557                 if (req->using_dma) {
1558                         /* Send a zero-length packet */
1559                         usba_ep_writel(ep, SET_STA,
1560                                         USBA_TX_PK_RDY);
1561                         usba_ep_writel(ep, CTL_DIS,
1562                                         USBA_TX_PK_RDY);
1563                         list_del_init(&req->queue);
1564                         submit_next_request(ep);
1565                         request_complete(ep, req, 0);
1566                 } else {
1567                         if (req->submitted)
1568                                 next_fifo_transaction(ep, req);
1569                         else
1570                                 submit_request(ep, req);
1571
1572                         if (req->last_transaction) {
1573                                 list_del_init(&req->queue);
1574                                 submit_next_request(ep);
1575                                 request_complete(ep, req, 0);
1576                         }
1577                 }
1578
1579                 epstatus = usba_ep_readl(ep, STA);
1580                 epctrl = usba_ep_readl(ep, CTL);
1581         }
1582         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1583                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1584                 receive_data(ep);
1585         }
1586 }
1587
1588 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1589 {
1590         struct usba_request *req;
1591         u32 status, control, pending;
1592
1593         status = usba_dma_readl(ep, STATUS);
1594         control = usba_dma_readl(ep, CONTROL);
1595 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1596         ep->last_dma_status = status;
1597 #endif
1598         pending = status & control;
1599         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1600
1601         if (status & USBA_DMA_CH_EN) {
1602                 dev_err(&udc->pdev->dev,
1603                         "DMA_CH_EN is set after transfer is finished!\n");
1604                 dev_err(&udc->pdev->dev,
1605                         "status=%#08x, pending=%#08x, control=%#08x\n",
1606                         status, pending, control);
1607
1608                 /*
1609                  * try to pretend nothing happened. We might have to
1610                  * do something here...
1611                  */
1612         }
1613
1614         if (list_empty(&ep->queue))
1615                 /* Might happen if a reset comes along at the right moment */
1616                 return;
1617
1618         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1619                 req = list_entry(ep->queue.next, struct usba_request, queue);
1620                 usba_update_req(ep, req, status);
1621
1622                 list_del_init(&req->queue);
1623                 submit_next_request(ep);
1624                 request_complete(ep, req, 0);
1625         }
1626 }
1627
1628 static irqreturn_t usba_udc_irq(int irq, void *devid)
1629 {
1630         struct usba_udc *udc = devid;
1631         u32 status, int_enb;
1632         u32 dma_status;
1633         u32 ep_status;
1634
1635         spin_lock(&udc->lock);
1636
1637         int_enb = usba_int_enb_get(udc);
1638         status = usba_readl(udc, INT_STA) & (int_enb | USBA_HIGH_SPEED);
1639         DBG(DBG_INT, "irq, status=%#08x\n", status);
1640
1641         if (status & USBA_DET_SUSPEND) {
1642                 toggle_bias(udc, 0);
1643                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1644                 usba_int_enb_set(udc, int_enb | USBA_WAKE_UP);
1645                 udc->bias_pulse_needed = true;
1646                 DBG(DBG_BUS, "Suspend detected\n");
1647                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1648                                 && udc->driver && udc->driver->suspend) {
1649                         spin_unlock(&udc->lock);
1650                         udc->driver->suspend(&udc->gadget);
1651                         spin_lock(&udc->lock);
1652                 }
1653         }
1654
1655         if (status & USBA_WAKE_UP) {
1656                 toggle_bias(udc, 1);
1657                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1658                 usba_int_enb_set(udc, int_enb & ~USBA_WAKE_UP);
1659                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1660         }
1661
1662         if (status & USBA_END_OF_RESUME) {
1663                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1664                 generate_bias_pulse(udc);
1665                 DBG(DBG_BUS, "Resume detected\n");
1666                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1667                                 && udc->driver && udc->driver->resume) {
1668                         spin_unlock(&udc->lock);
1669                         udc->driver->resume(&udc->gadget);
1670                         spin_lock(&udc->lock);
1671                 }
1672         }
1673
1674         dma_status = USBA_BFEXT(DMA_INT, status);
1675         if (dma_status) {
1676                 int i;
1677
1678                 for (i = 1; i <= USBA_NR_DMAS; i++)
1679                         if (dma_status & (1 << i))
1680                                 usba_dma_irq(udc, &udc->usba_ep[i]);
1681         }
1682
1683         ep_status = USBA_BFEXT(EPT_INT, status);
1684         if (ep_status) {
1685                 int i;
1686
1687                 for (i = 0; i < udc->num_ep; i++)
1688                         if (ep_status & (1 << i)) {
1689                                 if (ep_is_control(&udc->usba_ep[i]))
1690                                         usba_control_irq(udc, &udc->usba_ep[i]);
1691                                 else
1692                                         usba_ep_irq(udc, &udc->usba_ep[i]);
1693                         }
1694         }
1695
1696         if (status & USBA_END_OF_RESET) {
1697                 struct usba_ep *ep0;
1698
1699                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1700                 generate_bias_pulse(udc);
1701                 reset_all_endpoints(udc);
1702
1703                 if (udc->gadget.speed != USB_SPEED_UNKNOWN && udc->driver) {
1704                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1705                         spin_unlock(&udc->lock);
1706                         usb_gadget_udc_reset(&udc->gadget, udc->driver);
1707                         spin_lock(&udc->lock);
1708                 }
1709
1710                 if (status & USBA_HIGH_SPEED)
1711                         udc->gadget.speed = USB_SPEED_HIGH;
1712                 else
1713                         udc->gadget.speed = USB_SPEED_FULL;
1714                 DBG(DBG_BUS, "%s bus reset detected\n",
1715                     usb_speed_string(udc->gadget.speed));
1716
1717                 ep0 = &udc->usba_ep[0];
1718                 ep0->ep.desc = &usba_ep0_desc;
1719                 ep0->state = WAIT_FOR_SETUP;
1720                 usba_ep_writel(ep0, CFG,
1721                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1722                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1723                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1724                 usba_ep_writel(ep0, CTL_ENB,
1725                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1726                 usba_int_enb_set(udc, int_enb | USBA_BF(EPT_INT, 1) |
1727                                       USBA_DET_SUSPEND | USBA_END_OF_RESUME);
1728
1729                 /*
1730                  * Unclear why we hit this irregularly, e.g. in usbtest,
1731                  * but it's clearly harmless...
1732                  */
1733                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1734                         dev_dbg(&udc->pdev->dev,
1735                                  "ODD: EP0 configuration is invalid!\n");
1736         }
1737
1738         spin_unlock(&udc->lock);
1739
1740         return IRQ_HANDLED;
1741 }
1742
1743 static int start_clock(struct usba_udc *udc)
1744 {
1745         int ret;
1746
1747         if (udc->clocked)
1748                 return 0;
1749
1750         ret = clk_prepare_enable(udc->pclk);
1751         if (ret)
1752                 return ret;
1753         ret = clk_prepare_enable(udc->hclk);
1754         if (ret) {
1755                 clk_disable_unprepare(udc->pclk);
1756                 return ret;
1757         }
1758
1759         udc->clocked = true;
1760         return 0;
1761 }
1762
1763 static void stop_clock(struct usba_udc *udc)
1764 {
1765         if (!udc->clocked)
1766                 return;
1767
1768         clk_disable_unprepare(udc->hclk);
1769         clk_disable_unprepare(udc->pclk);
1770
1771         udc->clocked = false;
1772 }
1773
1774 static int usba_start(struct usba_udc *udc)
1775 {
1776         unsigned long flags;
1777         int ret;
1778
1779         ret = start_clock(udc);
1780         if (ret)
1781                 return ret;
1782
1783         spin_lock_irqsave(&udc->lock, flags);
1784         toggle_bias(udc, 1);
1785         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1786         usba_int_enb_set(udc, USBA_END_OF_RESET);
1787         spin_unlock_irqrestore(&udc->lock, flags);
1788
1789         return 0;
1790 }
1791
1792 static void usba_stop(struct usba_udc *udc)
1793 {
1794         unsigned long flags;
1795
1796         spin_lock_irqsave(&udc->lock, flags);
1797         udc->gadget.speed = USB_SPEED_UNKNOWN;
1798         reset_all_endpoints(udc);
1799
1800         /* This will also disable the DP pullup */
1801         toggle_bias(udc, 0);
1802         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1803         spin_unlock_irqrestore(&udc->lock, flags);
1804
1805         stop_clock(udc);
1806 }
1807
1808 static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
1809 {
1810         struct usba_udc *udc = devid;
1811         int vbus;
1812
1813         /* debounce */
1814         udelay(10);
1815
1816         mutex_lock(&udc->vbus_mutex);
1817
1818         vbus = vbus_is_present(udc);
1819         if (vbus != udc->vbus_prev) {
1820                 if (vbus) {
1821                         usba_start(udc);
1822                 } else {
1823                         usba_stop(udc);
1824
1825                         if (udc->driver->disconnect)
1826                                 udc->driver->disconnect(&udc->gadget);
1827                 }
1828                 udc->vbus_prev = vbus;
1829         }
1830
1831         mutex_unlock(&udc->vbus_mutex);
1832         return IRQ_HANDLED;
1833 }
1834
1835 static int atmel_usba_start(struct usb_gadget *gadget,
1836                 struct usb_gadget_driver *driver)
1837 {
1838         int ret;
1839         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1840         unsigned long flags;
1841
1842         spin_lock_irqsave(&udc->lock, flags);
1843         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1844         udc->driver = driver;
1845         spin_unlock_irqrestore(&udc->lock, flags);
1846
1847         mutex_lock(&udc->vbus_mutex);
1848
1849         if (gpio_is_valid(udc->vbus_pin))
1850                 enable_irq(gpio_to_irq(udc->vbus_pin));
1851
1852         /* If Vbus is present, enable the controller and wait for reset */
1853         udc->vbus_prev = vbus_is_present(udc);
1854         if (udc->vbus_prev) {
1855                 ret = usba_start(udc);
1856                 if (ret)
1857                         goto err;
1858         }
1859
1860         mutex_unlock(&udc->vbus_mutex);
1861         return 0;
1862
1863 err:
1864         if (gpio_is_valid(udc->vbus_pin))
1865                 disable_irq(gpio_to_irq(udc->vbus_pin));
1866
1867         mutex_unlock(&udc->vbus_mutex);
1868
1869         spin_lock_irqsave(&udc->lock, flags);
1870         udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1871         udc->driver = NULL;
1872         spin_unlock_irqrestore(&udc->lock, flags);
1873         return ret;
1874 }
1875
1876 static int atmel_usba_stop(struct usb_gadget *gadget)
1877 {
1878         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1879
1880         if (gpio_is_valid(udc->vbus_pin))
1881                 disable_irq(gpio_to_irq(udc->vbus_pin));
1882
1883         usba_stop(udc);
1884
1885         udc->driver = NULL;
1886
1887         return 0;
1888 }
1889
1890 #ifdef CONFIG_OF
1891 static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
1892 {
1893         regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
1894                            is_on ? AT91_PMC_BIASEN : 0);
1895 }
1896
1897 static void at91sam9g45_pulse_bias(struct usba_udc *udc)
1898 {
1899         regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN, 0);
1900         regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
1901                            AT91_PMC_BIASEN);
1902 }
1903
1904 static const struct usba_udc_errata at91sam9rl_errata = {
1905         .toggle_bias = at91sam9rl_toggle_bias,
1906 };
1907
1908 static const struct usba_udc_errata at91sam9g45_errata = {
1909         .pulse_bias = at91sam9g45_pulse_bias,
1910 };
1911
1912 static const struct of_device_id atmel_udc_dt_ids[] = {
1913         { .compatible = "atmel,at91sam9rl-udc", .data = &at91sam9rl_errata },
1914         { .compatible = "atmel,at91sam9g45-udc", .data = &at91sam9g45_errata },
1915         { .compatible = "atmel,sama5d3-udc" },
1916         { /* sentinel */ }
1917 };
1918
1919 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
1920
1921 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1922                                                     struct usba_udc *udc)
1923 {
1924         u32 val;
1925         const char *name;
1926         enum of_gpio_flags flags;
1927         struct device_node *np = pdev->dev.of_node;
1928         const struct of_device_id *match;
1929         struct device_node *pp;
1930         int i, ret;
1931         struct usba_ep *eps, *ep;
1932
1933         match = of_match_node(atmel_udc_dt_ids, np);
1934         if (!match)
1935                 return ERR_PTR(-EINVAL);
1936
1937         udc->errata = match->data;
1938         udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9g45-pmc");
1939         if (udc->errata && IS_ERR(udc->pmc))
1940                 return ERR_CAST(udc->pmc);
1941
1942         udc->num_ep = 0;
1943
1944         udc->vbus_pin = of_get_named_gpio_flags(np, "atmel,vbus-gpio", 0,
1945                                                 &flags);
1946         udc->vbus_pin_inverted = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
1947
1948         pp = NULL;
1949         while ((pp = of_get_next_child(np, pp)))
1950                 udc->num_ep++;
1951
1952         eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * udc->num_ep,
1953                            GFP_KERNEL);
1954         if (!eps)
1955                 return ERR_PTR(-ENOMEM);
1956
1957         udc->gadget.ep0 = &eps[0].ep;
1958
1959         INIT_LIST_HEAD(&eps[0].ep.ep_list);
1960
1961         pp = NULL;
1962         i = 0;
1963         while ((pp = of_get_next_child(np, pp))) {
1964                 ep = &eps[i];
1965
1966                 ret = of_property_read_u32(pp, "reg", &val);
1967                 if (ret) {
1968                         dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
1969                         goto err;
1970                 }
1971                 ep->index = val;
1972
1973                 ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
1974                 if (ret) {
1975                         dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
1976                         goto err;
1977                 }
1978                 ep->fifo_size = val;
1979
1980                 ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
1981                 if (ret) {
1982                         dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
1983                         goto err;
1984                 }
1985                 ep->nr_banks = val;
1986
1987                 ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
1988                 ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
1989
1990                 ret = of_property_read_string(pp, "name", &name);
1991                 if (ret) {
1992                         dev_err(&pdev->dev, "of_probe: name error(%d)\n", ret);
1993                         goto err;
1994                 }
1995                 ep->ep.name = name;
1996
1997                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
1998                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
1999                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
2000                 ep->ep.ops = &usba_ep_ops;
2001                 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
2002                 ep->udc = udc;
2003                 INIT_LIST_HEAD(&ep->queue);
2004
2005                 if (ep->index == 0) {
2006                         ep->ep.caps.type_control = true;
2007                 } else {
2008                         ep->ep.caps.type_iso = ep->can_isoc;
2009                         ep->ep.caps.type_bulk = true;
2010                         ep->ep.caps.type_int = true;
2011                 }
2012
2013                 ep->ep.caps.dir_in = true;
2014                 ep->ep.caps.dir_out = true;
2015
2016                 if (i)
2017                         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2018
2019                 i++;
2020         }
2021
2022         if (i == 0) {
2023                 dev_err(&pdev->dev, "of_probe: no endpoint specified\n");
2024                 ret = -EINVAL;
2025                 goto err;
2026         }
2027
2028         return eps;
2029 err:
2030         return ERR_PTR(ret);
2031 }
2032 #else
2033 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
2034                                                     struct usba_udc *udc)
2035 {
2036         return ERR_PTR(-ENOSYS);
2037 }
2038 #endif
2039
2040 static struct usba_ep * usba_udc_pdata(struct platform_device *pdev,
2041                                                  struct usba_udc *udc)
2042 {
2043         struct usba_platform_data *pdata = dev_get_platdata(&pdev->dev);
2044         struct usba_ep *eps;
2045         int i;
2046
2047         if (!pdata)
2048                 return ERR_PTR(-ENXIO);
2049
2050         eps = devm_kzalloc(&pdev->dev, sizeof(struct usba_ep) * pdata->num_ep,
2051                            GFP_KERNEL);
2052         if (!eps)
2053                 return ERR_PTR(-ENOMEM);
2054
2055         udc->gadget.ep0 = &eps[0].ep;
2056
2057         udc->vbus_pin = pdata->vbus_pin;
2058         udc->vbus_pin_inverted = pdata->vbus_pin_inverted;
2059         udc->num_ep = pdata->num_ep;
2060
2061         INIT_LIST_HEAD(&eps[0].ep.ep_list);
2062
2063         for (i = 0; i < pdata->num_ep; i++) {
2064                 struct usba_ep *ep = &eps[i];
2065
2066                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
2067                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
2068                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
2069                 ep->ep.ops = &usba_ep_ops;
2070                 ep->ep.name = pdata->ep[i].name;
2071                 ep->fifo_size = pdata->ep[i].fifo_size;
2072                 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
2073                 ep->udc = udc;
2074                 INIT_LIST_HEAD(&ep->queue);
2075                 ep->nr_banks = pdata->ep[i].nr_banks;
2076                 ep->index = pdata->ep[i].index;
2077                 ep->can_dma = pdata->ep[i].can_dma;
2078                 ep->can_isoc = pdata->ep[i].can_isoc;
2079
2080                 if (i == 0) {
2081                         ep->ep.caps.type_control = true;
2082                 } else {
2083                         ep->ep.caps.type_iso = ep->can_isoc;
2084                         ep->ep.caps.type_bulk = true;
2085                         ep->ep.caps.type_int = true;
2086                 }
2087
2088                 ep->ep.caps.dir_in = true;
2089                 ep->ep.caps.dir_out = true;
2090
2091                 if (i)
2092                         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2093         }
2094
2095         return eps;
2096 }
2097
2098 static int usba_udc_probe(struct platform_device *pdev)
2099 {
2100         struct resource *regs, *fifo;
2101         struct clk *pclk, *hclk;
2102         struct usba_udc *udc;
2103         int irq, ret, i;
2104
2105         udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
2106         if (!udc)
2107                 return -ENOMEM;
2108
2109         udc->gadget = usba_gadget_template;
2110         INIT_LIST_HEAD(&udc->gadget.ep_list);
2111
2112         regs = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
2113         fifo = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
2114         if (!regs || !fifo)
2115                 return -ENXIO;
2116
2117         irq = platform_get_irq(pdev, 0);
2118         if (irq < 0)
2119                 return irq;
2120
2121         pclk = devm_clk_get(&pdev->dev, "pclk");
2122         if (IS_ERR(pclk))
2123                 return PTR_ERR(pclk);
2124         hclk = devm_clk_get(&pdev->dev, "hclk");
2125         if (IS_ERR(hclk))
2126                 return PTR_ERR(hclk);
2127
2128         spin_lock_init(&udc->lock);
2129         mutex_init(&udc->vbus_mutex);
2130         udc->pdev = pdev;
2131         udc->pclk = pclk;
2132         udc->hclk = hclk;
2133         udc->vbus_pin = -ENODEV;
2134
2135         ret = -ENOMEM;
2136         udc->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2137         if (!udc->regs) {
2138                 dev_err(&pdev->dev, "Unable to map I/O memory, aborting.\n");
2139                 return ret;
2140         }
2141         dev_info(&pdev->dev, "MMIO registers at 0x%08lx mapped at %p\n",
2142                  (unsigned long)regs->start, udc->regs);
2143         udc->fifo = devm_ioremap(&pdev->dev, fifo->start, resource_size(fifo));
2144         if (!udc->fifo) {
2145                 dev_err(&pdev->dev, "Unable to map FIFO, aborting.\n");
2146                 return ret;
2147         }
2148         dev_info(&pdev->dev, "FIFO at 0x%08lx mapped at %p\n",
2149                  (unsigned long)fifo->start, udc->fifo);
2150
2151         platform_set_drvdata(pdev, udc);
2152
2153         /* Make sure we start from a clean slate */
2154         ret = clk_prepare_enable(pclk);
2155         if (ret) {
2156                 dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
2157                 return ret;
2158         }
2159
2160         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2161         clk_disable_unprepare(pclk);
2162
2163         if (pdev->dev.of_node)
2164                 udc->usba_ep = atmel_udc_of_init(pdev, udc);
2165         else
2166                 udc->usba_ep = usba_udc_pdata(pdev, udc);
2167
2168         toggle_bias(udc, 0);
2169
2170         if (IS_ERR(udc->usba_ep))
2171                 return PTR_ERR(udc->usba_ep);
2172
2173         ret = devm_request_irq(&pdev->dev, irq, usba_udc_irq, 0,
2174                                 "atmel_usba_udc", udc);
2175         if (ret) {
2176                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2177                         irq, ret);
2178                 return ret;
2179         }
2180         udc->irq = irq;
2181
2182         if (gpio_is_valid(udc->vbus_pin)) {
2183                 if (!devm_gpio_request(&pdev->dev, udc->vbus_pin, "atmel_usba_udc")) {
2184                         irq_set_status_flags(gpio_to_irq(udc->vbus_pin),
2185                                         IRQ_NOAUTOEN);
2186                         ret = devm_request_threaded_irq(&pdev->dev,
2187                                         gpio_to_irq(udc->vbus_pin), NULL,
2188                                         usba_vbus_irq_thread, IRQF_ONESHOT,
2189                                         "atmel_usba_udc", udc);
2190                         if (ret) {
2191                                 udc->vbus_pin = -ENODEV;
2192                                 dev_warn(&udc->pdev->dev,
2193                                          "failed to request vbus irq; "
2194                                          "assuming always on\n");
2195                         }
2196                 } else {
2197                         /* gpio_request fail so use -EINVAL for gpio_is_valid */
2198                         udc->vbus_pin = -EINVAL;
2199                 }
2200         }
2201
2202         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2203         if (ret)
2204                 return ret;
2205         device_init_wakeup(&pdev->dev, 1);
2206
2207         usba_init_debugfs(udc);
2208         for (i = 1; i < udc->num_ep; i++)
2209                 usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2210
2211         return 0;
2212 }
2213
2214 static int usba_udc_remove(struct platform_device *pdev)
2215 {
2216         struct usba_udc *udc;
2217         int i;
2218
2219         udc = platform_get_drvdata(pdev);
2220
2221         device_init_wakeup(&pdev->dev, 0);
2222         usb_del_gadget_udc(&udc->gadget);
2223
2224         for (i = 1; i < udc->num_ep; i++)
2225                 usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2226         usba_cleanup_debugfs(udc);
2227
2228         return 0;
2229 }
2230
2231 #ifdef CONFIG_PM_SLEEP
2232 static int usba_udc_suspend(struct device *dev)
2233 {
2234         struct usba_udc *udc = dev_get_drvdata(dev);
2235
2236         /* Not started */
2237         if (!udc->driver)
2238                 return 0;
2239
2240         mutex_lock(&udc->vbus_mutex);
2241
2242         if (!device_may_wakeup(dev)) {
2243                 usba_stop(udc);
2244                 goto out;
2245         }
2246
2247         /*
2248          * Device may wake up. We stay clocked if we failed
2249          * to request vbus irq, assuming always on.
2250          */
2251         if (gpio_is_valid(udc->vbus_pin)) {
2252                 usba_stop(udc);
2253                 enable_irq_wake(gpio_to_irq(udc->vbus_pin));
2254         }
2255
2256 out:
2257         mutex_unlock(&udc->vbus_mutex);
2258         return 0;
2259 }
2260
2261 static int usba_udc_resume(struct device *dev)
2262 {
2263         struct usba_udc *udc = dev_get_drvdata(dev);
2264
2265         /* Not started */
2266         if (!udc->driver)
2267                 return 0;
2268
2269         if (device_may_wakeup(dev) && gpio_is_valid(udc->vbus_pin))
2270                 disable_irq_wake(gpio_to_irq(udc->vbus_pin));
2271
2272         /* If Vbus is present, enable the controller and wait for reset */
2273         mutex_lock(&udc->vbus_mutex);
2274         udc->vbus_prev = vbus_is_present(udc);
2275         if (udc->vbus_prev)
2276                 usba_start(udc);
2277         mutex_unlock(&udc->vbus_mutex);
2278
2279         return 0;
2280 }
2281 #endif
2282
2283 static SIMPLE_DEV_PM_OPS(usba_udc_pm_ops, usba_udc_suspend, usba_udc_resume);
2284
2285 static struct platform_driver udc_driver = {
2286         .remove         = usba_udc_remove,
2287         .driver         = {
2288                 .name           = "atmel_usba_udc",
2289                 .pm             = &usba_udc_pm_ops,
2290                 .of_match_table = of_match_ptr(atmel_udc_dt_ids),
2291         },
2292 };
2293
2294 module_platform_driver_probe(udc_driver, usba_udc_probe);
2295
2296 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2297 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2298 MODULE_LICENSE("GPL");
2299 MODULE_ALIAS("platform:atmel_usba_udc");