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/platform_device.h>
  21 #include <linux/usb/ch9.h>
  22 #include <linux/usb/gadget.h>
  23 #include <linux/usb/atmel_usba_udc.h>
  24 #include <linux/delay.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] = usba_io_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_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
 268                                 CTRL_IOMEM_ID);
 269
 270         if (regs_resource) {
 271                 regs = debugfs_create_file_size("regs", 0400, root, udc,
 272                                                 &regs_dbg_fops,
 273                                                 resource_size(regs_resource));
 274                 if (!regs)
 275                         goto err_regs;
 276                 udc->debugfs_regs = regs;
 277         }
 278
 279         usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
 280
 281         return;
 282
 283 err_regs:
 284         debugfs_remove(root);
 285 err_root:
 286         udc->debugfs_root = NULL;
 287         dev_err(&udc->pdev->dev, "debugfs is not available\n");
 288 }
 289
 290 static void usba_cleanup_debugfs(struct usba_udc *udc)
 291 {
 292         usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
 293         debugfs_remove(udc->debugfs_regs);
 294         debugfs_remove(udc->debugfs_root);
 295         udc->debugfs_regs = NULL;
 296         udc->debugfs_root = NULL;
 297 }
 298 #else
 299 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
 300                                          struct usba_ep *ep)
 301 {
 302
 303 }
 304
 305 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 306 {
 307
 308 }
 309
 310 static inline void usba_init_debugfs(struct usba_udc *udc)
 311 {
 312
 313 }
 314
 315 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
 316 {
 317
 318 }
 319 #endif
 320
 321 static inline u32 usba_int_enb_get(struct usba_udc *udc)
 322 {
 323         return udc->int_enb_cache;
 324 }
 325
 326 static inline void usba_int_enb_set(struct usba_udc *udc, u32 val)
 327 {
 328         usba_writel(udc, INT_ENB, val);
 329         udc->int_enb_cache = val;
 330 }
 331
 332 static int vbus_is_present(struct usba_udc *udc)
 333 {
 334         if (gpio_is_valid(udc->vbus_pin))
 335                 return gpio_get_value(udc->vbus_pin) ^ udc->vbus_pin_inverted;
 336
 337         /* No Vbus detection: Assume always present */
 338         return 1;
 339 }
 340
 341 static void toggle_bias(struct usba_udc *udc, int is_on)
 342 {
 343         if (udc->errata && udc->errata->toggle_bias)
 344                 udc->errata->toggle_bias(udc, is_on);
 345 }
 346
 347 static void generate_bias_pulse(struct usba_udc *udc)
 348 {
 349         if (!udc->bias_pulse_needed)
 350                 return;
 351
 352         if (udc->errata && udc->errata->pulse_bias)
 353                 udc->errata->pulse_bias(udc);
 354
 355         udc->bias_pulse_needed = false;
 356 }
 357
 358 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 359 {
 360         unsigned int transaction_len;
 361
 362         transaction_len = req->req.length - req->req.actual;
 363         req->last_transaction = 1;
 364         if (transaction_len > ep->ep.maxpacket) {
 365                 transaction_len = ep->ep.maxpacket;
 366                 req->last_transaction = 0;
 367         } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
 368                 req->last_transaction = 0;
 369
 370         DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
 371                 ep->ep.name, req, transaction_len,
 372                 req->last_transaction ? ", done" : "");
 373
 374         memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
 375         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 376         req->req.actual += transaction_len;
 377 }
 378
 379 static void submit_request(struct usba_ep *ep, struct usba_request *req)
 380 {
 381         DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
 382                 ep->ep.name, req, req->req.length);
 383
 384         req->req.actual = 0;
 385         req->submitted = 1;
 386
 387         if (req->using_dma) {
 388                 if (req->req.length == 0) {
 389                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 390                         return;
 391                 }
 392
 393                 if (req->req.zero)
 394                         usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
 395                 else
 396                         usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
 397
 398                 usba_dma_writel(ep, ADDRESS, req->req.dma);
 399                 usba_dma_writel(ep, CONTROL, req->ctrl);
 400         } else {
 401                 next_fifo_transaction(ep, req);
 402                 if (req->last_transaction) {
 403                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
 404                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 405                 } else {
 406                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
 407                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 408                 }
 409         }
 410 }
 411
 412 static void submit_next_request(struct usba_ep *ep)
 413 {
 414         struct usba_request *req;
 415
 416         if (list_empty(&ep->queue)) {
 417                 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
 418                 return;
 419         }
 420
 421         req = list_entry(ep->queue.next, struct usba_request, queue);
 422         if (!req->submitted)
 423                 submit_request(ep, req);
 424 }
 425
 426 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
 427 {
 428         ep->state = STATUS_STAGE_IN;
 429         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 430         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 431 }
 432
 433 static void receive_data(struct usba_ep *ep)
 434 {
 435         struct usba_udc *udc = ep->udc;
 436         struct usba_request *req;
 437         unsigned long status;
 438         unsigned int bytecount, nr_busy;
 439         int is_complete = 0;
 440
 441         status = usba_ep_readl(ep, STA);
 442         nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 443
 444         DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
 445
 446         while (nr_busy > 0) {
 447                 if (list_empty(&ep->queue)) {
 448                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 449                         break;
 450                 }
 451                 req = list_entry(ep->queue.next,
 452                                  struct usba_request, queue);
 453
 454                 bytecount = USBA_BFEXT(BYTE_COUNT, status);
 455
 456                 if (status & (1 << 31))
 457                         is_complete = 1;
 458                 if (req->req.actual + bytecount >= req->req.length) {
 459                         is_complete = 1;
 460                         bytecount = req->req.length - req->req.actual;
 461                 }
 462
 463                 memcpy_fromio(req->req.buf + req->req.actual,
 464                                 ep->fifo, bytecount);
 465                 req->req.actual += bytecount;
 466
 467                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
 468
 469                 if (is_complete) {
 470                         DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
 471                         req->req.status = 0;
 472                         list_del_init(&req->queue);
 473                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 474                         spin_unlock(&udc->lock);
 475                         usb_gadget_giveback_request(&ep->ep, &req->req);
 476                         spin_lock(&udc->lock);
 477                 }
 478
 479                 status = usba_ep_readl(ep, STA);
 480                 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 481
 482                 if (is_complete && ep_is_control(ep)) {
 483                         send_status(udc, ep);
 484                         break;
 485                 }
 486         }
 487 }
 488
 489 static void
 490 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
 491 {
 492         struct usba_udc *udc = ep->udc;
 493
 494         WARN_ON(!list_empty(&req->queue));
 495
 496         if (req->req.status == -EINPROGRESS)
 497                 req->req.status = status;
 498
 499         if (req->using_dma)
 500                 usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
 501
 502         DBG(DBG_GADGET | DBG_REQ,
 503                 "%s: req %p complete: status %d, actual %u\n",
 504                 ep->ep.name, req, req->req.status, req->req.actual);
 505
 506         spin_unlock(&udc->lock);
 507         usb_gadget_giveback_request(&ep->ep, &req->req);
 508         spin_lock(&udc->lock);
 509 }
 510
 511 static void
 512 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
 513 {
 514         struct usba_request *req, *tmp_req;
 515
 516         list_for_each_entry_safe(req, tmp_req, list, queue) {
 517                 list_del_init(&req->queue);
 518                 request_complete(ep, req, status);
 519         }
 520 }
 521
 522 static int
 523 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 524 {
 525         struct usba_ep *ep = to_usba_ep(_ep);
 526         struct usba_udc *udc = ep->udc;
 527         unsigned long flags, ept_cfg, maxpacket;
 528         unsigned int nr_trans;
 529
 530         DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
 531
 532         maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
 533
 534         if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
 535                         || ep->index == 0
 536                         || desc->bDescriptorType != USB_DT_ENDPOINT
 537                         || maxpacket == 0
 538                         || maxpacket > ep->fifo_size) {
 539                 DBG(DBG_ERR, "ep_enable: Invalid argument");
 540                 return -EINVAL;
 541         }
 542
 543         ep->is_isoc = 0;
 544         ep->is_in = 0;
 545
 546         if (maxpacket <= 8)
 547                 ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
 548         else
 549                 /* LSB is bit 1, not 0 */
 550                 ept_cfg = USBA_BF(EPT_SIZE, fls(maxpacket - 1) - 3);
 551
 552         DBG(DBG_HW, "%s: EPT_SIZE = %lu (maxpacket = %lu)\n",
 553                         ep->ep.name, ept_cfg, maxpacket);
 554
 555         if (usb_endpoint_dir_in(desc)) {
 556                 ep->is_in = 1;
 557                 ept_cfg |= USBA_EPT_DIR_IN;
 558         }
 559
 560         switch (usb_endpoint_type(desc)) {
 561         case USB_ENDPOINT_XFER_CONTROL:
 562                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 563                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE);
 564                 break;
 565         case USB_ENDPOINT_XFER_ISOC:
 566                 if (!ep->can_isoc) {
 567                         DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
 568                                         ep->ep.name);
 569                         return -EINVAL;
 570                 }
 571
 572                 /*
 573                  * Bits 11:12 specify number of _additional_
 574                  * transactions per microframe.
 575                  */
 576                 nr_trans = ((usb_endpoint_maxp(desc) >> 11) & 3) + 1;
 577                 if (nr_trans > 3)
 578                         return -EINVAL;
 579
 580                 ep->is_isoc = 1;
 581                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 582
 583                 /*
 584                  * Do triple-buffering on high-bandwidth iso endpoints.
 585                  */
 586                 if (nr_trans > 1 && ep->nr_banks == 3)
 587                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_TRIPLE);
 588                 else
 589                         ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 590                 ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 591                 break;
 592         case USB_ENDPOINT_XFER_BULK:
 593                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 594                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 595                 break;
 596         case USB_ENDPOINT_XFER_INT:
 597                 ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 598                 ept_cfg |= USBA_BF(BK_NUMBER, USBA_BK_NUMBER_DOUBLE);
 599                 break;
 600         }
 601
 602         spin_lock_irqsave(&ep->udc->lock, flags);
 603
 604         ep->ep.desc = desc;
 605         ep->ep.maxpacket = maxpacket;
 606
 607         usba_ep_writel(ep, CFG, ept_cfg);
 608         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 609
 610         if (ep->can_dma) {
 611                 u32 ctrl;
 612
 613                 usba_int_enb_set(udc, usba_int_enb_get(udc) |
 614                                       USBA_BF(EPT_INT, 1 << ep->index) |
 615                                       USBA_BF(DMA_INT, 1 << ep->index));
 616                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 617                 usba_ep_writel(ep, CTL_ENB, ctrl);
 618         } else {
 619                 usba_int_enb_set(udc, usba_int_enb_get(udc) |
 620                                       USBA_BF(EPT_INT, 1 << ep->index));
 621         }
 622
 623         spin_unlock_irqrestore(&udc->lock, flags);
 624
 625         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 626                         (unsigned long)usba_ep_readl(ep, CFG));
 627         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 628                         (unsigned long)usba_int_enb_get(udc));
 629
 630         return 0;
 631 }
 632
 633 static int usba_ep_disable(struct usb_ep *_ep)
 634 {
 635         struct usba_ep *ep = to_usba_ep(_ep);
 636         struct usba_udc *udc = ep->udc;
 637         LIST_HEAD(req_list);
 638         unsigned long flags;
 639
 640         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 641
 642         spin_lock_irqsave(&udc->lock, flags);
 643
 644         if (!ep->ep.desc) {
 645                 spin_unlock_irqrestore(&udc->lock, flags);
 646                 /* REVISIT because this driver disables endpoints in
 647                  * reset_all_endpoints() before calling disconnect(),
 648                  * most gadget drivers would trigger this non-error ...
 649                  */
 650                 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
 651                         DBG(DBG_ERR, "ep_disable: %s not enabled\n",
 652                                         ep->ep.name);
 653                 return -EINVAL;
 654         }
 655         ep->ep.desc = NULL;
 656
 657         list_splice_init(&ep->queue, &req_list);
 658         if (ep->can_dma) {
 659                 usba_dma_writel(ep, CONTROL, 0);
 660                 usba_dma_writel(ep, ADDRESS, 0);
 661                 usba_dma_readl(ep, STATUS);
 662         }
 663         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 664         usba_int_enb_set(udc, usba_int_enb_get(udc) &
 665                               ~USBA_BF(EPT_INT, 1 << ep->index));
 666
 667         request_complete_list(ep, &req_list, -ESHUTDOWN);
 668
 669         spin_unlock_irqrestore(&udc->lock, flags);
 670
 671         return 0;
 672 }
 673
 674 static struct usb_request *
 675 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 676 {
 677         struct usba_request *req;
 678
 679         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 680
 681         req = kzalloc(sizeof(*req), gfp_flags);
 682         if (!req)
 683                 return NULL;
 684
 685         INIT_LIST_HEAD(&req->queue);
 686
 687         return &req->req;
 688 }
 689
 690 static void
 691 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 692 {
 693         struct usba_request *req = to_usba_req(_req);
 694
 695         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 696
 697         kfree(req);
 698 }
 699
 700 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 701                 struct usba_request *req, gfp_t gfp_flags)
 702 {
 703         unsigned long flags;
 704         int ret;
 705
 706         DBG(DBG_DMA, "%s: req l/%u d/%pad %c%c%c\n",
 707                 ep->ep.name, req->req.length, &req->req.dma,
 708                 req->req.zero ? 'Z' : 'z',
 709                 req->req.short_not_ok ? 'S' : 's',
 710                 req->req.no_interrupt ? 'I' : 'i');
 711
 712         if (req->req.length > 0x10000) {
 713                 /* Lengths from 0 to 65536 (inclusive) are supported */
 714                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 715                 return -EINVAL;
 716         }
 717
 718         ret = usb_gadget_map_request(&udc->gadget, &req->req, ep->is_in);
 719         if (ret)
 720                 return ret;
 721
 722         req->using_dma = 1;
 723         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 724                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 725                         | USBA_DMA_END_BUF_EN;
 726
 727         if (!ep->is_in)
 728                 req->ctrl |= USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 729
 730         /*
 731          * Add this request to the queue and submit for DMA if
 732          * possible. Check if we're still alive first -- we may have
 733          * received a reset since last time we checked.
 734          */
 735         ret = -ESHUTDOWN;
 736         spin_lock_irqsave(&udc->lock, flags);
 737         if (ep->ep.desc) {
 738                 if (list_empty(&ep->queue))
 739                         submit_request(ep, req);
 740
 741                 list_add_tail(&req->queue, &ep->queue);
 742                 ret = 0;
 743         }
 744         spin_unlock_irqrestore(&udc->lock, flags);
 745
 746         return ret;
 747 }
 748
 749 static int
 750 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 751 {
 752         struct usba_request *req = to_usba_req(_req);
 753         struct usba_ep *ep = to_usba_ep(_ep);
 754         struct usba_udc *udc = ep->udc;
 755         unsigned long flags;
 756         int ret;
 757
 758         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 759                         ep->ep.name, req, _req->length);
 760
 761         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
 762             !ep->ep.desc)
 763                 return -ESHUTDOWN;
 764
 765         req->submitted = 0;
 766         req->using_dma = 0;
 767         req->last_transaction = 0;
 768
 769         _req->status = -EINPROGRESS;
 770         _req->actual = 0;
 771
 772         if (ep->can_dma)
 773                 return queue_dma(udc, ep, req, gfp_flags);
 774
 775         /* May have received a reset since last time we checked */
 776         ret = -ESHUTDOWN;
 777         spin_lock_irqsave(&udc->lock, flags);
 778         if (ep->ep.desc) {
 779                 list_add_tail(&req->queue, &ep->queue);
 780
 781                 if ((!ep_is_control(ep) && ep->is_in) ||
 782                         (ep_is_control(ep)
 783                                 && (ep->state == DATA_STAGE_IN
 784                                         || ep->state == STATUS_STAGE_IN)))
 785                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 786                 else
 787                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 788                 ret = 0;
 789         }
 790         spin_unlock_irqrestore(&udc->lock, flags);
 791
 792         return ret;
 793 }
 794
 795 static void
 796 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 797 {
 798         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 799 }
 800
 801 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 802 {
 803         unsigned int timeout;
 804         u32 status;
 805
 806         /*
 807          * Stop the DMA controller. When writing both CH_EN
 808          * and LINK to 0, the other bits are not affected.
 809          */
 810         usba_dma_writel(ep, CONTROL, 0);
 811
 812         /* Wait for the FIFO to empty */
 813         for (timeout = 40; timeout; --timeout) {
 814                 status = usba_dma_readl(ep, STATUS);
 815                 if (!(status & USBA_DMA_CH_EN))
 816                         break;
 817                 udelay(1);
 818         }
 819
 820         if (pstatus)
 821                 *pstatus = status;
 822
 823         if (timeout == 0) {
 824                 dev_err(&ep->udc->pdev->dev,
 825                         "%s: timed out waiting for DMA FIFO to empty\n",
 826                         ep->ep.name);
 827                 return -ETIMEDOUT;
 828         }
 829
 830         return 0;
 831 }
 832
 833 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 834 {
 835         struct usba_ep *ep = to_usba_ep(_ep);
 836         struct usba_udc *udc = ep->udc;
 837         struct usba_request *req;
 838         unsigned long flags;
 839         u32 status;
 840
 841         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 842                         ep->ep.name, req);
 843
 844         spin_lock_irqsave(&udc->lock, flags);
 845
 846         list_for_each_entry(req, &ep->queue, queue) {
 847                 if (&req->req == _req)
 848                         break;
 849         }
 850
 851         if (&req->req != _req) {
 852                 spin_unlock_irqrestore(&udc->lock, flags);
 853                 return -EINVAL;
 854         }
 855
 856         if (req->using_dma) {
 857                 /*
 858                  * If this request is currently being transferred,
 859                  * stop the DMA controller and reset the FIFO.
 860                  */
 861                 if (ep->queue.next == &req->queue) {
 862                         status = usba_dma_readl(ep, STATUS);
 863                         if (status & USBA_DMA_CH_EN)
 864                                 stop_dma(ep, &status);
 865
 866 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 867                         ep->last_dma_status = status;
 868 #endif
 869
 870                         usba_writel(udc, EPT_RST, 1 << ep->index);
 871
 872                         usba_update_req(ep, req, status);
 873                 }
 874         }
 875
 876         /*
 877          * Errors should stop the queue from advancing until the
 878          * completion function returns.
 879          */
 880         list_del_init(&req->queue);
 881
 882         request_complete(ep, req, -ECONNRESET);
 883
 884         /* Process the next request if any */
 885         submit_next_request(ep);
 886         spin_unlock_irqrestore(&udc->lock, flags);
 887
 888         return 0;
 889 }
 890
 891 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 892 {
 893         struct usba_ep *ep = to_usba_ep(_ep);
 894         struct usba_udc *udc = ep->udc;
 895         unsigned long flags;
 896         int ret = 0;
 897
 898         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 899                         value ? "set" : "clear");
 900
 901         if (!ep->ep.desc) {
 902                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 903                                 ep->ep.name);
 904                 return -ENODEV;
 905         }
 906         if (ep->is_isoc) {
 907                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 908                                 ep->ep.name);
 909                 return -ENOTTY;
 910         }
 911
 912         spin_lock_irqsave(&udc->lock, flags);
 913
 914         /*
 915          * We can't halt IN endpoints while there are still data to be
 916          * transferred
 917          */
 918         if (!list_empty(&ep->queue)
 919                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 920                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 921                 ret = -EAGAIN;
 922         } else {
 923                 if (value)
 924                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 925                 else
 926                         usba_ep_writel(ep, CLR_STA,
 927                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 928                 usba_ep_readl(ep, STA);
 929         }
 930
 931         spin_unlock_irqrestore(&udc->lock, flags);
 932
 933         return ret;
 934 }
 935
 936 static int usba_ep_fifo_status(struct usb_ep *_ep)
 937 {
 938         struct usba_ep *ep = to_usba_ep(_ep);
 939
 940         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 941 }
 942
 943 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 944 {
 945         struct usba_ep *ep = to_usba_ep(_ep);
 946         struct usba_udc *udc = ep->udc;
 947
 948         usba_writel(udc, EPT_RST, 1 << ep->index);
 949 }
 950
 951 static const struct usb_ep_ops usba_ep_ops = {
 952         .enable         = usba_ep_enable,
 953         .disable        = usba_ep_disable,
 954         .alloc_request  = usba_ep_alloc_request,
 955         .free_request   = usba_ep_free_request,
 956         .queue          = usba_ep_queue,
 957         .dequeue        = usba_ep_dequeue,
 958         .set_halt       = usba_ep_set_halt,
 959         .fifo_status    = usba_ep_fifo_status,
 960         .fifo_flush     = usba_ep_fifo_flush,
 961 };
 962
 963 static int usba_udc_get_frame(struct usb_gadget *gadget)
 964 {
 965         struct usba_udc *udc = to_usba_udc(gadget);
 966
 967         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 968 }
 969
 970 static int usba_udc_wakeup(struct usb_gadget *gadget)
 971 {
 972         struct usba_udc *udc = to_usba_udc(gadget);
 973         unsigned long flags;
 974         u32 ctrl;
 975         int ret = -EINVAL;
 976
 977         spin_lock_irqsave(&udc->lock, flags);
 978         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
 979                 ctrl = usba_readl(udc, CTRL);
 980                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
 981                 ret = 0;
 982         }
 983         spin_unlock_irqrestore(&udc->lock, flags);
 984
 985         return ret;
 986 }
 987
 988 static int
 989 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 990 {
 991         struct usba_udc *udc = to_usba_udc(gadget);
 992         unsigned long flags;
 993
 994         gadget->is_selfpowered = (is_selfpowered != 0);
 995         spin_lock_irqsave(&udc->lock, flags);
 996         if (is_selfpowered)
 997                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
 998         else
 999                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1000         spin_unlock_irqrestore(&udc->lock, flags);
1001
1002         return 0;
1003 }
1004
1005 static int atmel_usba_start(struct usb_gadget *gadget,
1006                 struct usb_gadget_driver *driver);
1007 static int atmel_usba_stop(struct usb_gadget *gadget);
1008
1009 static const struct usb_gadget_ops usba_udc_ops = {
1010         .get_frame              = usba_udc_get_frame,
1011         .wakeup                 = usba_udc_wakeup,
1012         .set_selfpowered        = usba_udc_set_selfpowered,
1013         .udc_start              = atmel_usba_start,
1014         .udc_stop               = atmel_usba_stop,
1015 };
1016
1017 static struct usb_endpoint_descriptor usba_ep0_desc = {
1018         .bLength = USB_DT_ENDPOINT_SIZE,
1019         .bDescriptorType = USB_DT_ENDPOINT,
1020         .bEndpointAddress = 0,
1021         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1022         .wMaxPacketSize = cpu_to_le16(64),
1023         /* FIXME: I have no idea what to put here */
1024         .bInterval = 1,
1025 };
1026
1027 static struct usb_gadget usba_gadget_template = {
1028         .ops            = &usba_udc_ops,
1029         .max_speed      = USB_SPEED_HIGH,
1030         .name           = "atmel_usba_udc",
1031 };
1032
1033 /*
1034  * Called with interrupts disabled and udc->lock held.
1035  */
1036 static void reset_all_endpoints(struct usba_udc *udc)
1037 {
1038         struct usba_ep *ep;
1039         struct usba_request *req, *tmp_req;
1040
1041         usba_writel(udc, EPT_RST, ~0UL);
1042
1043         ep = to_usba_ep(udc->gadget.ep0);
1044         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1045                 list_del_init(&req->queue);
1046                 request_complete(ep, req, -ECONNRESET);
1047         }
1048
1049         /* NOTE:  normally, the next call to the gadget driver is in
1050          * charge of disabling endpoints... usually disconnect().
1051          * The exception would be entering a high speed test mode.
1052          *
1053          * FIXME remove this code ... and retest thoroughly.
1054          */
1055         list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
1056                 if (ep->ep.desc) {
1057                         spin_unlock(&udc->lock);
1058                         usba_ep_disable(&ep->ep);
1059                         spin_lock(&udc->lock);
1060                 }
1061         }
1062 }
1063
1064 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1065 {
1066         struct usba_ep *ep;
1067
1068         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1069                 return to_usba_ep(udc->gadget.ep0);
1070
1071         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1072                 u8 bEndpointAddress;
1073
1074                 if (!ep->ep.desc)
1075                         continue;
1076                 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1077                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1078                         continue;
1079                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1080                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1081                         return ep;
1082         }
1083
1084         return NULL;
1085 }
1086
1087 /* Called with interrupts disabled and udc->lock held */
1088 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1089 {
1090         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1091         ep->state = WAIT_FOR_SETUP;
1092 }
1093
1094 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1095 {
1096         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1097                 return 1;
1098         return 0;
1099 }
1100
1101 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1102 {
1103         u32 regval;
1104
1105         DBG(DBG_BUS, "setting address %u...\n", addr);
1106         regval = usba_readl(udc, CTRL);
1107         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1108         usba_writel(udc, CTRL, regval);
1109 }
1110
1111 static int do_test_mode(struct usba_udc *udc)
1112 {
1113         static const char test_packet_buffer[] = {
1114                 /* JKJKJKJK * 9 */
1115                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1116                 /* JJKKJJKK * 8 */
1117                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1118                 /* JJKKJJKK * 8 */
1119                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1120                 /* JJJJJJJKKKKKKK * 8 */
1121                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1122                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1123                 /* JJJJJJJK * 8 */
1124                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1125                 /* {JKKKKKKK * 10}, JK */
1126                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1127         };
1128         struct usba_ep *ep;
1129         struct device *dev = &udc->pdev->dev;
1130         int test_mode;
1131
1132         test_mode = udc->test_mode;
1133
1134         /* Start from a clean slate */
1135         reset_all_endpoints(udc);
1136
1137         switch (test_mode) {
1138         case 0x0100:
1139                 /* Test_J */
1140                 usba_writel(udc, TST, USBA_TST_J_MODE);
1141                 dev_info(dev, "Entering Test_J mode...\n");
1142                 break;
1143         case 0x0200:
1144                 /* Test_K */
1145                 usba_writel(udc, TST, USBA_TST_K_MODE);
1146                 dev_info(dev, "Entering Test_K mode...\n");
1147                 break;
1148         case 0x0300:
1149                 /*
1150                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1151                  * for Bulk IN transfers
1152                  */
1153                 ep = &udc->usba_ep[0];
1154                 usba_writel(udc, TST,
1155                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1156                 usba_ep_writel(ep, CFG,
1157                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1158                                 | USBA_EPT_DIR_IN
1159                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1160                                 | USBA_BF(BK_NUMBER, 1));
1161                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1162                         set_protocol_stall(udc, ep);
1163                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1164                 } else {
1165                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1166                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1167                 }
1168                 break;
1169         case 0x0400:
1170                 /* Test_Packet */
1171                 ep = &udc->usba_ep[0];
1172                 usba_ep_writel(ep, CFG,
1173                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1174                                 | USBA_EPT_DIR_IN
1175                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1176                                 | USBA_BF(BK_NUMBER, 1));
1177                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1178                         set_protocol_stall(udc, ep);
1179                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1180                 } else {
1181                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1182                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1183                         memcpy_toio(ep->fifo, test_packet_buffer,
1184                                         sizeof(test_packet_buffer));
1185                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1186                         dev_info(dev, "Entering Test_Packet mode...\n");
1187                 }
1188                 break;
1189         default:
1190                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1191                 return -EINVAL;
1192         }
1193
1194         return 0;
1195 }
1196
1197 /* Avoid overly long expressions */
1198 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1199 {
1200         if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1201                 return true;
1202         return false;
1203 }
1204
1205 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1206 {
1207         if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1208                 return true;
1209         return false;
1210 }
1211
1212 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1213 {
1214         if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1215                 return true;
1216         return false;
1217 }
1218
1219 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1220                 struct usb_ctrlrequest *crq)
1221 {
1222         int retval = 0;
1223
1224         switch (crq->bRequest) {
1225         case USB_REQ_GET_STATUS: {
1226                 u16 status;
1227
1228                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1229                         status = cpu_to_le16(udc->devstatus);
1230                 } else if (crq->bRequestType
1231                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1232                         status = cpu_to_le16(0);
1233                 } else if (crq->bRequestType
1234                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1235                         struct usba_ep *target;
1236
1237                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1238                         if (!target)
1239                                 goto stall;
1240
1241                         status = 0;
1242                         if (is_stalled(udc, target))
1243                                 status |= cpu_to_le16(1);
1244                 } else
1245                         goto delegate;
1246
1247                 /* Write directly to the FIFO. No queueing is done. */
1248                 if (crq->wLength != cpu_to_le16(sizeof(status)))
1249                         goto stall;
1250                 ep->state = DATA_STAGE_IN;
1251                 usba_io_writew(status, ep->fifo);
1252                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1253                 break;
1254         }
1255
1256         case USB_REQ_CLEAR_FEATURE: {
1257                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1258                         if (feature_is_dev_remote_wakeup(crq))
1259                                 udc->devstatus
1260                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1261                         else
1262                                 /* Can't CLEAR_FEATURE TEST_MODE */
1263                                 goto stall;
1264                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1265                         struct usba_ep *target;
1266
1267                         if (crq->wLength != cpu_to_le16(0)
1268                                         || !feature_is_ep_halt(crq))
1269                                 goto stall;
1270                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1271                         if (!target)
1272                                 goto stall;
1273
1274                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1275                         if (target->index != 0)
1276                                 usba_ep_writel(target, CLR_STA,
1277                                                 USBA_TOGGLE_CLR);
1278                 } else {
1279                         goto delegate;
1280                 }
1281
1282                 send_status(udc, ep);
1283                 break;
1284         }
1285
1286         case USB_REQ_SET_FEATURE: {
1287                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1288                         if (feature_is_dev_test_mode(crq)) {
1289                                 send_status(udc, ep);
1290                                 ep->state = STATUS_STAGE_TEST;
1291                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1292                                 return 0;
1293                         } else if (feature_is_dev_remote_wakeup(crq)) {
1294                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1295                         } else {
1296                                 goto stall;
1297                         }
1298                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1299                         struct usba_ep *target;
1300
1301                         if (crq->wLength != cpu_to_le16(0)
1302                                         || !feature_is_ep_halt(crq))
1303                                 goto stall;
1304
1305                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1306                         if (!target)
1307                                 goto stall;
1308
1309                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1310                 } else
1311                         goto delegate;
1312
1313                 send_status(udc, ep);
1314                 break;
1315         }
1316
1317         case USB_REQ_SET_ADDRESS:
1318                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1319                         goto delegate;
1320
1321                 set_address(udc, le16_to_cpu(crq->wValue));
1322                 send_status(udc, ep);
1323                 ep->state = STATUS_STAGE_ADDR;
1324                 break;
1325
1326         default:
1327 delegate:
1328                 spin_unlock(&udc->lock);
1329                 retval = udc->driver->setup(&udc->gadget, crq);
1330                 spin_lock(&udc->lock);
1331         }
1332
1333         return retval;
1334
1335 stall:
1336         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1337                 "halting endpoint...\n",
1338                 ep->ep.name, crq->bRequestType, crq->bRequest,
1339                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1340                 le16_to_cpu(crq->wLength));
1341         set_protocol_stall(udc, ep);
1342         return -1;
1343 }
1344
1345 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1346 {
1347         struct usba_request *req;
1348         u32 epstatus;
1349         u32 epctrl;
1350
1351 restart:
1352         epstatus = usba_ep_readl(ep, STA);
1353         epctrl = usba_ep_readl(ep, CTL);
1354
1355         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1356                         ep->ep.name, ep->state, epstatus, epctrl);
1357
1358         req = NULL;
1359         if (!list_empty(&ep->queue))
1360                 req = list_entry(ep->queue.next,
1361                                  struct usba_request, queue);
1362
1363         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1364                 if (req->submitted)
1365                         next_fifo_transaction(ep, req);
1366                 else
1367                         submit_request(ep, req);
1368
1369                 if (req->last_transaction) {
1370                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1371                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1372                 }
1373                 goto restart;
1374         }
1375         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1376                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1377
1378                 switch (ep->state) {
1379                 case DATA_STAGE_IN:
1380                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1381                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1382                         ep->state = STATUS_STAGE_OUT;
1383                         break;
1384                 case STATUS_STAGE_ADDR:
1385                         /* Activate our new address */
1386                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1387                                                 | USBA_FADDR_EN));
1388                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1389                         ep->state = WAIT_FOR_SETUP;
1390                         break;
1391                 case STATUS_STAGE_IN:
1392                         if (req) {
1393                                 list_del_init(&req->queue);
1394                                 request_complete(ep, req, 0);
1395                                 submit_next_request(ep);
1396                         }
1397                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1398                         ep->state = WAIT_FOR_SETUP;
1399                         break;
1400                 case STATUS_STAGE_TEST:
1401                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1402                         ep->state = WAIT_FOR_SETUP;
1403                         if (do_test_mode(udc))
1404                                 set_protocol_stall(udc, ep);
1405                         break;
1406                 default:
1407                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1408                                 "halting endpoint...\n",
1409                                 ep->ep.name, ep->state);
1410                         set_protocol_stall(udc, ep);
1411                         break;
1412                 }
1413
1414                 goto restart;
1415         }
1416         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1417                 switch (ep->state) {
1418                 case STATUS_STAGE_OUT:
1419                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1420                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1421
1422                         if (req) {
1423                                 list_del_init(&req->queue);
1424                                 request_complete(ep, req, 0);
1425                         }
1426                         ep->state = WAIT_FOR_SETUP;
1427                         break;
1428
1429                 case DATA_STAGE_OUT:
1430                         receive_data(ep);
1431                         break;
1432
1433                 default:
1434                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1435                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1436                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1437                                 "halting endpoint...\n",
1438                                 ep->ep.name, ep->state);
1439                         set_protocol_stall(udc, ep);
1440                         break;
1441                 }
1442
1443                 goto restart;
1444         }
1445         if (epstatus & USBA_RX_SETUP) {
1446                 union {
1447                         struct usb_ctrlrequest crq;
1448                         unsigned long data[2];
1449                 } crq;
1450                 unsigned int pkt_len;
1451                 int ret;
1452
1453                 if (ep->state != WAIT_FOR_SETUP) {
1454                         /*
1455                          * Didn't expect a SETUP packet at this
1456                          * point. Clean up any pending requests (which
1457                          * may be successful).
1458                          */
1459                         int status = -EPROTO;
1460
1461                         /*
1462                          * RXRDY and TXCOMP are dropped when SETUP
1463                          * packets arrive.  Just pretend we received
1464                          * the status packet.
1465                          */
1466                         if (ep->state == STATUS_STAGE_OUT
1467                                         || ep->state == STATUS_STAGE_IN) {
1468                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1469                                 status = 0;
1470                         }
1471
1472                         if (req) {
1473                                 list_del_init(&req->queue);
1474                                 request_complete(ep, req, status);
1475                         }
1476                 }
1477
1478                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1479                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1480                 if (pkt_len != sizeof(crq)) {
1481                         pr_warning("udc: Invalid packet length %u "
1482                                 "(expected %zu)\n", pkt_len, sizeof(crq));
1483                         set_protocol_stall(udc, ep);
1484                         return;
1485                 }
1486
1487                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1488                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1489
1490                 /* Free up one bank in the FIFO so that we can
1491                  * generate or receive a reply right away. */
1492                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1493
1494                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1495                         ep->state, crq.crq.bRequestType,
1496                         crq.crq.bRequest); */
1497
1498                 if (crq.crq.bRequestType & USB_DIR_IN) {
1499                         /*
1500                          * The USB 2.0 spec states that "if wLength is
1501                          * zero, there is no data transfer phase."
1502                          * However, testusb #14 seems to actually
1503                          * expect a data phase even if wLength = 0...
1504                          */
1505                         ep->state = DATA_STAGE_IN;
1506                 } else {
1507                         if (crq.crq.wLength != cpu_to_le16(0))
1508                                 ep->state = DATA_STAGE_OUT;
1509                         else
1510                                 ep->state = STATUS_STAGE_IN;
1511                 }
1512
1513                 ret = -1;
1514                 if (ep->index == 0)
1515                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1516                 else {
1517                         spin_unlock(&udc->lock);
1518                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1519                         spin_lock(&udc->lock);
1520                 }
1521
1522                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1523                         crq.crq.bRequestType, crq.crq.bRequest,
1524                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1525
1526                 if (ret < 0) {
1527                         /* Let the host know that we failed */
1528                         set_protocol_stall(udc, ep);
1529                 }
1530         }
1531 }
1532
1533 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1534 {
1535         struct usba_request *req;
1536         u32 epstatus;
1537         u32 epctrl;
1538
1539         epstatus = usba_ep_readl(ep, STA);
1540         epctrl = usba_ep_readl(ep, CTL);
1541
1542         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1543
1544         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1545                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1546
1547                 if (list_empty(&ep->queue)) {
1548                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1549                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1550                         return;
1551                 }
1552
1553                 req = list_entry(ep->queue.next, struct usba_request, queue);
1554
1555                 if (req->using_dma) {
1556                         /* Send a zero-length packet */
1557                         usba_ep_writel(ep, SET_STA,
1558                                         USBA_TX_PK_RDY);
1559                         usba_ep_writel(ep, CTL_DIS,
1560                                         USBA_TX_PK_RDY);
1561                         list_del_init(&req->queue);
1562                         submit_next_request(ep);
1563                         request_complete(ep, req, 0);
1564                 } else {
1565                         if (req->submitted)
1566                                 next_fifo_transaction(ep, req);
1567                         else
1568                                 submit_request(ep, req);
1569
1570                         if (req->last_transaction) {
1571                                 list_del_init(&req->queue);
1572                                 submit_next_request(ep);
1573                                 request_complete(ep, req, 0);
1574                         }
1575                 }
1576
1577                 epstatus = usba_ep_readl(ep, STA);
1578                 epctrl = usba_ep_readl(ep, CTL);
1579         }
1580         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1581                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1582                 receive_data(ep);
1583         }
1584 }
1585
1586 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1587 {
1588         struct usba_request *req;
1589         u32 status, control, pending;
1590
1591         status = usba_dma_readl(ep, STATUS);
1592         control = usba_dma_readl(ep, CONTROL);
1593 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1594         ep->last_dma_status = status;
1595 #endif
1596         pending = status & control;
1597         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1598
1599         if (status & USBA_DMA_CH_EN) {
1600                 dev_err(&udc->pdev->dev,
1601                         "DMA_CH_EN is set after transfer is finished!\n");
1602                 dev_err(&udc->pdev->dev,
1603                         "status=%#08x, pending=%#08x, control=%#08x\n",
1604                         status, pending, control);
1605
1606                 /*
1607                  * try to pretend nothing happened. We might have to
1608                  * do something here...
1609                  */
1610         }
1611
1612         if (list_empty(&ep->queue))
1613                 /* Might happen if a reset comes along at the right moment */
1614                 return;
1615
1616         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1617                 req = list_entry(ep->queue.next, struct usba_request, queue);
1618                 usba_update_req(ep, req, status);
1619
1620                 list_del_init(&req->queue);
1621                 submit_next_request(ep);
1622                 request_complete(ep, req, 0);
1623         }
1624 }
1625
1626 static irqreturn_t usba_udc_irq(int irq, void *devid)
1627 {
1628         struct usba_udc *udc = devid;
1629         u32 status, int_enb;
1630         u32 dma_status;
1631         u32 ep_status;
1632
1633         spin_lock(&udc->lock);
1634
1635         int_enb = usba_int_enb_get(udc);
1636         status = usba_readl(udc, INT_STA) & int_enb;
1637         DBG(DBG_INT, "irq, status=%#08x\n", status);
1638
1639         if (status & USBA_DET_SUSPEND) {
1640                 toggle_bias(udc, 0);
1641                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND);
1642                 usba_int_enb_set(udc, int_enb | USBA_WAKE_UP);
1643                 udc->bias_pulse_needed = true;
1644                 DBG(DBG_BUS, "Suspend detected\n");
1645                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1646                                 && udc->driver && udc->driver->suspend) {
1647                         spin_unlock(&udc->lock);
1648                         udc->driver->suspend(&udc->gadget);
1649                         spin_lock(&udc->lock);
1650                 }
1651         }
1652
1653         if (status & USBA_WAKE_UP) {
1654                 toggle_bias(udc, 1);
1655                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1656                 usba_int_enb_set(udc, int_enb & ~USBA_WAKE_UP);
1657                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1658         }
1659
1660         if (status & USBA_END_OF_RESUME) {
1661                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1662                 generate_bias_pulse(udc);
1663                 DBG(DBG_BUS, "Resume detected\n");
1664                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1665                                 && udc->driver && udc->driver->resume) {
1666                         spin_unlock(&udc->lock);
1667                         udc->driver->resume(&udc->gadget);
1668                         spin_lock(&udc->lock);
1669                 }
1670         }
1671
1672         dma_status = USBA_BFEXT(DMA_INT, status);
1673         if (dma_status) {
1674                 int i;
1675
1676                 for (i = 1; i <= USBA_NR_DMAS; i++)
1677                         if (dma_status & (1 << i))
1678                                 usba_dma_irq(udc, &udc->usba_ep[i]);
1679         }
1680
1681         ep_status = USBA_BFEXT(EPT_INT, status);
1682         if (ep_status) {
1683                 int i;
1684
1685                 for (i = 0; i < udc->num_ep; i++)
1686                         if (ep_status & (1 << i)) {
1687                                 if (ep_is_control(&udc->usba_ep[i]))
1688                                         usba_control_irq(udc, &udc->usba_ep[i]);
1689                                 else
1690                                         usba_ep_irq(udc, &udc->usba_ep[i]);
1691                         }
1692         }
1693
1694         if (status & USBA_END_OF_RESET) {
1695                 struct usba_ep *ep0;
1696
1697                 usba_writel(udc, INT_CLR, USBA_END_OF_RESET);
1698                 generate_bias_pulse(udc);
1699                 reset_all_endpoints(udc);
1700
1701                 if (udc->gadget.speed != USB_SPEED_UNKNOWN && udc->driver) {
1702                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1703                         spin_unlock(&udc->lock);
1704                         usb_gadget_udc_reset(&udc->gadget, udc->driver);
1705                         spin_lock(&udc->lock);
1706                 }
1707
1708                 if (status & USBA_HIGH_SPEED)
1709                         udc->gadget.speed = USB_SPEED_HIGH;
1710                 else
1711                         udc->gadget.speed = USB_SPEED_FULL;
1712                 DBG(DBG_BUS, "%s bus reset detected\n",
1713                     usb_speed_string(udc->gadget.speed));
1714
1715                 ep0 = &udc->usba_ep[0];
1716                 ep0->ep.desc = &usba_ep0_desc;
1717                 ep0->state = WAIT_FOR_SETUP;
1718                 usba_ep_writel(ep0, CFG,
1719                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1720                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1721                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1722                 usba_ep_writel(ep0, CTL_ENB,
1723                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1724                 usba_int_enb_set(udc, int_enb | USBA_BF(EPT_INT, 1) |
1725                                       USBA_DET_SUSPEND | USBA_END_OF_RESUME);
1726
1727                 /*
1728                  * Unclear why we hit this irregularly, e.g. in usbtest,
1729                  * but it's clearly harmless...
1730                  */
1731                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1732                         dev_dbg(&udc->pdev->dev,
1733                                  "ODD: EP0 configuration is invalid!\n");
1734         }
1735
1736         spin_unlock(&udc->lock);
1737
1738         return IRQ_HANDLED;
1739 }
1740
1741 static int start_clock(struct usba_udc *udc)
1742 {
1743         int ret;
1744
1745         if (udc->clocked)
1746                 return 0;
1747
1748         ret = clk_prepare_enable(udc->pclk);
1749         if (ret)
1750                 return ret;
1751         ret = clk_prepare_enable(udc->hclk);
1752         if (ret) {
1753                 clk_disable_unprepare(udc->pclk);
1754                 return ret;
1755         }
1756
1757         udc->clocked = true;
1758         return 0;
1759 }
1760
1761 static void stop_clock(struct usba_udc *udc)
1762 {
1763         if (!udc->clocked)
1764                 return;
1765
1766         clk_disable_unprepare(udc->hclk);
1767         clk_disable_unprepare(udc->pclk);
1768
1769         udc->clocked = false;
1770 }
1771
1772 static int usba_start(struct usba_udc *udc)
1773 {
1774         unsigned long flags;
1775         int ret;
1776
1777         ret = start_clock(udc);
1778         if (ret)
1779                 return ret;
1780
1781         spin_lock_irqsave(&udc->lock, flags);
1782         toggle_bias(udc, 1);
1783         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1784         usba_int_enb_set(udc, USBA_END_OF_RESET);
1785         spin_unlock_irqrestore(&udc->lock, flags);
1786
1787         return 0;
1788 }
1789
1790 static void usba_stop(struct usba_udc *udc)
1791 {
1792         unsigned long flags;
1793
1794         spin_lock_irqsave(&udc->lock, flags);
1795         udc->gadget.speed = USB_SPEED_UNKNOWN;
1796         reset_all_endpoints(udc);
1797
1798         /* This will also disable the DP pullup */
1799         toggle_bias(udc, 0);
1800         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1801         spin_unlock_irqrestore(&udc->lock, flags);
1802
1803         stop_clock(udc);
1804 }
1805
1806 static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
1807 {
1808         struct usba_udc *udc = devid;
1809         int vbus;
1810
1811         /* debounce */
1812         udelay(10);
1813
1814         mutex_lock(&udc->vbus_mutex);
1815
1816         vbus = vbus_is_present(udc);
1817         if (vbus != udc->vbus_prev) {
1818                 if (vbus) {
1819                         usba_start(udc);
1820                 } else {
1821                         usba_stop(udc);
1822
1823                         if (udc->driver->disconnect)
1824                                 udc->driver->disconnect(&udc->gadget);
1825                 }
1826                 udc->vbus_prev = vbus;
1827         }
1828
1829         mutex_unlock(&udc->vbus_mutex);
1830         return IRQ_HANDLED;
1831 }
1832
1833 static int atmel_usba_start(struct usb_gadget *gadget,
1834                 struct usb_gadget_driver *driver)
1835 {
1836         int ret;
1837         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1838         unsigned long flags;
1839
1840         spin_lock_irqsave(&udc->lock, flags);
1841         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1842         udc->driver = driver;
1843         spin_unlock_irqrestore(&udc->lock, flags);
1844
1845         mutex_lock(&udc->vbus_mutex);
1846
1847         if (gpio_is_valid(udc->vbus_pin))
1848                 enable_irq(gpio_to_irq(udc->vbus_pin));
1849
1850         /* If Vbus is present, enable the controller and wait for reset */
1851         udc->vbus_prev = vbus_is_present(udc);
1852         if (udc->vbus_prev) {
1853                 ret = usba_start(udc);
1854                 if (ret)
1855                         goto err;
1856         }
1857
1858         mutex_unlock(&udc->vbus_mutex);
1859         return 0;
1860
1861 err:
1862         if (gpio_is_valid(udc->vbus_pin))
1863                 disable_irq(gpio_to_irq(udc->vbus_pin));
1864
1865         mutex_unlock(&udc->vbus_mutex);
1866
1867         spin_lock_irqsave(&udc->lock, flags);
1868         udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1869         udc->driver = NULL;
1870         spin_unlock_irqrestore(&udc->lock, flags);
1871         return ret;
1872 }
1873
1874 static int atmel_usba_stop(struct usb_gadget *gadget)
1875 {
1876         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1877
1878         if (gpio_is_valid(udc->vbus_pin))
1879                 disable_irq(gpio_to_irq(udc->vbus_pin));
1880
1881         usba_stop(udc);
1882
1883         udc->driver = NULL;
1884
1885         return 0;
1886 }
1887
1888 #ifdef CONFIG_OF
1889 static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
1890 {
1891         unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
1892
1893         if (is_on)
1894                 at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
1895         else
1896                 at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
1897 }
1898
1899 static void at91sam9g45_pulse_bias(struct usba_udc *udc)
1900 {
1901         unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
1902
1903         at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
1904         at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
1905 }
1906
1907 static const struct usba_udc_errata at91sam9rl_errata = {
1908         .toggle_bias = at91sam9rl_toggle_bias,
1909 };
1910
1911 static const struct usba_udc_errata at91sam9g45_errata = {
1912         .pulse_bias = at91sam9g45_pulse_bias,
1913 };
1914
1915 static const struct of_device_id atmel_udc_dt_ids[] = {
1916         { .compatible = "atmel,at91sam9rl-udc", .data = &at91sam9rl_errata },
1917         { .compatible = "atmel,at91sam9g45-udc", .data = &at91sam9g45_errata },
1918         { .compatible = "atmel,sama5d3-udc" },
1919         { /* sentinel */ }
1920 };
1921
1922 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
1923
1924 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
1925                                                     struct usba_udc *udc)
1926 {
1927         u32 val;
1928         const char *name;
1929         enum of_gpio_flags flags;
1930         struct device_node *np = pdev->dev.of_node;
1931         const struct of_device_id *match;
1932         struct device_node *pp;
1933         int i, ret;
1934         struct usba_ep *eps, *ep;
1935
1936         match = of_match_node(atmel_udc_dt_ids, np);
1937         if (!match)
1938                 return ERR_PTR(-EINVAL);
1939
1940         udc->errata = match->data;
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");