drivers/usb/gadget/udc/atmel_usba_udc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for the Atmel USBA high speed USB device controller
   4  *
   5  * Copyright (C) 2005-2007 Atmel Corporation
   6  */
   7 #include <linux/clk.h>
   8 #include <linux/clk/at91_pmc.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/io.h>
  13 #include <linux/slab.h>
  14 #include <linux/device.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/list.h>
  17 #include <linux/mfd/syscon.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/ctype.h>
  21 #include <linux/usb/ch9.h>
  22 #include <linux/usb/gadget.h>
  23 #include <linux/delay.h>
  24 #include <linux/of.h>
  25 #include <linux/irq.h>
  26 #include <linux/gpio/consumer.h>
  27
  28 #include "atmel_usba_udc.h"
  29 #define USBA_VBUS_IRQFLAGS (IRQF_ONESHOT \
  30                            | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING)
  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(buf, nbytes))
  92                 return -EFAULT;
  93
  94         inode_lock(file_inode(file));
  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         inode_unlock(file_inode(file));
 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         inode_lock(inode);
 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] = readl_relaxed(udc->regs + i * 4);
 155         spin_unlock_irq(&udc->lock);
 156
 157         file->private_data = data;
 158         ret = 0;
 159
 160 out:
 161         inode_unlock(inode);
 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         inode_lock(inode);
 173         ret = simple_read_from_buffer(buf, nbytes, ppos,
 174                         file->private_data,
 175                         file_inode(file)->i_size);
 176         inode_unlock(inode);
 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         ep->debugfs_dir = ep_root;
 210
 211         debugfs_create_file("queue", 0400, ep_root, ep, &queue_dbg_fops);
 212         if (ep->can_dma)
 213                 debugfs_create_u32("dma_status", 0400, ep_root,
 214                                    &ep->last_dma_status);
 215         if (ep_is_control(ep))
 216                 debugfs_create_u32("state", 0400, ep_root, &ep->state);
 217 }
 218
 219 static void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 220 {
 221         debugfs_remove_recursive(ep->debugfs_dir);
 222 }
 223
 224 static void usba_init_debugfs(struct usba_udc *udc)
 225 {
 226         struct dentry *root;
 227         struct resource *regs_resource;
 228
 229         root = debugfs_create_dir(udc->gadget.name, NULL);
 230         udc->debugfs_root = root;
 231
 232         regs_resource = platform_get_resource(udc->pdev, IORESOURCE_MEM,
 233                                 CTRL_IOMEM_ID);
 234
 235         if (regs_resource) {
 236                 debugfs_create_file_size("regs", 0400, root, udc,
 237                                          &regs_dbg_fops,
 238                                          resource_size(regs_resource));
 239         }
 240
 241         usba_ep_init_debugfs(udc, to_usba_ep(udc->gadget.ep0));
 242 }
 243
 244 static void usba_cleanup_debugfs(struct usba_udc *udc)
 245 {
 246         usba_ep_cleanup_debugfs(to_usba_ep(udc->gadget.ep0));
 247         debugfs_remove_recursive(udc->debugfs_root);
 248 }
 249 #else
 250 static inline void usba_ep_init_debugfs(struct usba_udc *udc,
 251                                          struct usba_ep *ep)
 252 {
 253
 254 }
 255
 256 static inline void usba_ep_cleanup_debugfs(struct usba_ep *ep)
 257 {
 258
 259 }
 260
 261 static inline void usba_init_debugfs(struct usba_udc *udc)
 262 {
 263
 264 }
 265
 266 static inline void usba_cleanup_debugfs(struct usba_udc *udc)
 267 {
 268
 269 }
 270 #endif
 271
 272 static ushort fifo_mode;
 273
 274 module_param(fifo_mode, ushort, 0x0);
 275 MODULE_PARM_DESC(fifo_mode, "Endpoint configuration mode");
 276
 277 /* mode 0 - uses autoconfig */
 278
 279 /* mode 1 - fits in 8KB, generic max fifo configuration */
 280 static struct usba_fifo_cfg mode_1_cfg[] = {
 281 { .hw_ep_num = 0, .fifo_size = 64,      .nr_banks = 1, },
 282 { .hw_ep_num = 1, .fifo_size = 1024,    .nr_banks = 2, },
 283 { .hw_ep_num = 2, .fifo_size = 1024,    .nr_banks = 1, },
 284 { .hw_ep_num = 3, .fifo_size = 1024,    .nr_banks = 1, },
 285 { .hw_ep_num = 4, .fifo_size = 1024,    .nr_banks = 1, },
 286 { .hw_ep_num = 5, .fifo_size = 1024,    .nr_banks = 1, },
 287 { .hw_ep_num = 6, .fifo_size = 1024,    .nr_banks = 1, },
 288 };
 289
 290 /* mode 2 - fits in 8KB, performance max fifo configuration */
 291 static struct usba_fifo_cfg mode_2_cfg[] = {
 292 { .hw_ep_num = 0, .fifo_size = 64,      .nr_banks = 1, },
 293 { .hw_ep_num = 1, .fifo_size = 1024,    .nr_banks = 3, },
 294 { .hw_ep_num = 2, .fifo_size = 1024,    .nr_banks = 2, },
 295 { .hw_ep_num = 3, .fifo_size = 1024,    .nr_banks = 2, },
 296 };
 297
 298 /* mode 3 - fits in 8KB, mixed fifo configuration */
 299 static struct usba_fifo_cfg mode_3_cfg[] = {
 300 { .hw_ep_num = 0, .fifo_size = 64,      .nr_banks = 1, },
 301 { .hw_ep_num = 1, .fifo_size = 1024,    .nr_banks = 2, },
 302 { .hw_ep_num = 2, .fifo_size = 512,     .nr_banks = 2, },
 303 { .hw_ep_num = 3, .fifo_size = 512,     .nr_banks = 2, },
 304 { .hw_ep_num = 4, .fifo_size = 512,     .nr_banks = 2, },
 305 { .hw_ep_num = 5, .fifo_size = 512,     .nr_banks = 2, },
 306 { .hw_ep_num = 6, .fifo_size = 512,     .nr_banks = 2, },
 307 };
 308
 309 /* mode 4 - fits in 8KB, custom fifo configuration */
 310 static struct usba_fifo_cfg mode_4_cfg[] = {
 311 { .hw_ep_num = 0, .fifo_size = 64,      .nr_banks = 1, },
 312 { .hw_ep_num = 1, .fifo_size = 512,     .nr_banks = 2, },
 313 { .hw_ep_num = 2, .fifo_size = 512,     .nr_banks = 2, },
 314 { .hw_ep_num = 3, .fifo_size = 8,       .nr_banks = 2, },
 315 { .hw_ep_num = 4, .fifo_size = 512,     .nr_banks = 2, },
 316 { .hw_ep_num = 5, .fifo_size = 512,     .nr_banks = 2, },
 317 { .hw_ep_num = 6, .fifo_size = 16,      .nr_banks = 2, },
 318 { .hw_ep_num = 7, .fifo_size = 8,       .nr_banks = 2, },
 319 { .hw_ep_num = 8, .fifo_size = 8,       .nr_banks = 2, },
 320 };
 321 /* Add additional configurations here */
 322
 323 static int usba_config_fifo_table(struct usba_udc *udc)
 324 {
 325         int n;
 326
 327         switch (fifo_mode) {
 328         default:
 329                 fifo_mode = 0;
 330                 /* fall through */
 331         case 0:
 332                 udc->fifo_cfg = NULL;
 333                 n = 0;
 334                 break;
 335         case 1:
 336                 udc->fifo_cfg = mode_1_cfg;
 337                 n = ARRAY_SIZE(mode_1_cfg);
 338                 break;
 339         case 2:
 340                 udc->fifo_cfg = mode_2_cfg;
 341                 n = ARRAY_SIZE(mode_2_cfg);
 342                 break;
 343         case 3:
 344                 udc->fifo_cfg = mode_3_cfg;
 345                 n = ARRAY_SIZE(mode_3_cfg);
 346                 break;
 347         case 4:
 348                 udc->fifo_cfg = mode_4_cfg;
 349                 n = ARRAY_SIZE(mode_4_cfg);
 350                 break;
 351         }
 352         DBG(DBG_HW, "Setup fifo_mode %d\n", fifo_mode);
 353
 354         return n;
 355 }
 356
 357 static inline u32 usba_int_enb_get(struct usba_udc *udc)
 358 {
 359         return udc->int_enb_cache;
 360 }
 361
 362 static inline void usba_int_enb_set(struct usba_udc *udc, u32 mask)
 363 {
 364         u32 val;
 365
 366         val = udc->int_enb_cache | mask;
 367         usba_writel(udc, INT_ENB, val);
 368         udc->int_enb_cache = val;
 369 }
 370
 371 static inline void usba_int_enb_clear(struct usba_udc *udc, u32 mask)
 372 {
 373         u32 val;
 374
 375         val = udc->int_enb_cache & ~mask;
 376         usba_writel(udc, INT_ENB, val);
 377         udc->int_enb_cache = val;
 378 }
 379
 380 static int vbus_is_present(struct usba_udc *udc)
 381 {
 382         if (udc->vbus_pin)
 383                 return gpiod_get_value(udc->vbus_pin);
 384
 385         /* No Vbus detection: Assume always present */
 386         return 1;
 387 }
 388
 389 static void toggle_bias(struct usba_udc *udc, int is_on)
 390 {
 391         if (udc->errata && udc->errata->toggle_bias)
 392                 udc->errata->toggle_bias(udc, is_on);
 393 }
 394
 395 static void generate_bias_pulse(struct usba_udc *udc)
 396 {
 397         if (!udc->bias_pulse_needed)
 398                 return;
 399
 400         if (udc->errata && udc->errata->pulse_bias)
 401                 udc->errata->pulse_bias(udc);
 402
 403         udc->bias_pulse_needed = false;
 404 }
 405
 406 static void next_fifo_transaction(struct usba_ep *ep, struct usba_request *req)
 407 {
 408         unsigned int transaction_len;
 409
 410         transaction_len = req->req.length - req->req.actual;
 411         req->last_transaction = 1;
 412         if (transaction_len > ep->ep.maxpacket) {
 413                 transaction_len = ep->ep.maxpacket;
 414                 req->last_transaction = 0;
 415         } else if (transaction_len == ep->ep.maxpacket && req->req.zero)
 416                 req->last_transaction = 0;
 417
 418         DBG(DBG_QUEUE, "%s: submit_transaction, req %p (length %d)%s\n",
 419                 ep->ep.name, req, transaction_len,
 420                 req->last_transaction ? ", done" : "");
 421
 422         memcpy_toio(ep->fifo, req->req.buf + req->req.actual, transaction_len);
 423         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 424         req->req.actual += transaction_len;
 425 }
 426
 427 static void submit_request(struct usba_ep *ep, struct usba_request *req)
 428 {
 429         DBG(DBG_QUEUE, "%s: submit_request: req %p (length %d)\n",
 430                 ep->ep.name, req, req->req.length);
 431
 432         req->req.actual = 0;
 433         req->submitted = 1;
 434
 435         if (req->using_dma) {
 436                 if (req->req.length == 0) {
 437                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 438                         return;
 439                 }
 440
 441                 if (req->req.zero)
 442                         usba_ep_writel(ep, CTL_ENB, USBA_SHORT_PACKET);
 443                 else
 444                         usba_ep_writel(ep, CTL_DIS, USBA_SHORT_PACKET);
 445
 446                 usba_dma_writel(ep, ADDRESS, req->req.dma);
 447                 usba_dma_writel(ep, CONTROL, req->ctrl);
 448         } else {
 449                 next_fifo_transaction(ep, req);
 450                 if (req->last_transaction) {
 451                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
 452                         if (ep_is_control(ep))
 453                                 usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 454                 } else {
 455                         if (ep_is_control(ep))
 456                                 usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
 457                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 458                 }
 459         }
 460 }
 461
 462 static void submit_next_request(struct usba_ep *ep)
 463 {
 464         struct usba_request *req;
 465
 466         if (list_empty(&ep->queue)) {
 467                 usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY | USBA_RX_BK_RDY);
 468                 return;
 469         }
 470
 471         req = list_entry(ep->queue.next, struct usba_request, queue);
 472         if (!req->submitted)
 473                 submit_request(ep, req);
 474 }
 475
 476 static void send_status(struct usba_udc *udc, struct usba_ep *ep)
 477 {
 478         ep->state = STATUS_STAGE_IN;
 479         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
 480         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
 481 }
 482
 483 static void receive_data(struct usba_ep *ep)
 484 {
 485         struct usba_udc *udc = ep->udc;
 486         struct usba_request *req;
 487         unsigned long status;
 488         unsigned int bytecount, nr_busy;
 489         int is_complete = 0;
 490
 491         status = usba_ep_readl(ep, STA);
 492         nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 493
 494         DBG(DBG_QUEUE, "receive data: nr_busy=%u\n", nr_busy);
 495
 496         while (nr_busy > 0) {
 497                 if (list_empty(&ep->queue)) {
 498                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 499                         break;
 500                 }
 501                 req = list_entry(ep->queue.next,
 502                                  struct usba_request, queue);
 503
 504                 bytecount = USBA_BFEXT(BYTE_COUNT, status);
 505
 506                 if (status & (1 << 31))
 507                         is_complete = 1;
 508                 if (req->req.actual + bytecount >= req->req.length) {
 509                         is_complete = 1;
 510                         bytecount = req->req.length - req->req.actual;
 511                 }
 512
 513                 memcpy_fromio(req->req.buf + req->req.actual,
 514                                 ep->fifo, bytecount);
 515                 req->req.actual += bytecount;
 516
 517                 usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
 518
 519                 if (is_complete) {
 520                         DBG(DBG_QUEUE, "%s: request done\n", ep->ep.name);
 521                         req->req.status = 0;
 522                         list_del_init(&req->queue);
 523                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
 524                         spin_unlock(&udc->lock);
 525                         usb_gadget_giveback_request(&ep->ep, &req->req);
 526                         spin_lock(&udc->lock);
 527                 }
 528
 529                 status = usba_ep_readl(ep, STA);
 530                 nr_busy = USBA_BFEXT(BUSY_BANKS, status);
 531
 532                 if (is_complete && ep_is_control(ep)) {
 533                         send_status(udc, ep);
 534                         break;
 535                 }
 536         }
 537 }
 538
 539 static void
 540 request_complete(struct usba_ep *ep, struct usba_request *req, int status)
 541 {
 542         struct usba_udc *udc = ep->udc;
 543
 544         WARN_ON(!list_empty(&req->queue));
 545
 546         if (req->req.status == -EINPROGRESS)
 547                 req->req.status = status;
 548
 549         if (req->using_dma)
 550                 usb_gadget_unmap_request(&udc->gadget, &req->req, ep->is_in);
 551
 552         DBG(DBG_GADGET | DBG_REQ,
 553                 "%s: req %p complete: status %d, actual %u\n",
 554                 ep->ep.name, req, req->req.status, req->req.actual);
 555
 556         spin_unlock(&udc->lock);
 557         usb_gadget_giveback_request(&ep->ep, &req->req);
 558         spin_lock(&udc->lock);
 559 }
 560
 561 static void
 562 request_complete_list(struct usba_ep *ep, struct list_head *list, int status)
 563 {
 564         struct usba_request *req, *tmp_req;
 565
 566         list_for_each_entry_safe(req, tmp_req, list, queue) {
 567                 list_del_init(&req->queue);
 568                 request_complete(ep, req, status);
 569         }
 570 }
 571
 572 static int
 573 usba_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 574 {
 575         struct usba_ep *ep = to_usba_ep(_ep);
 576         struct usba_udc *udc = ep->udc;
 577         unsigned long flags, maxpacket;
 578         unsigned int nr_trans;
 579
 580         DBG(DBG_GADGET, "%s: ep_enable: desc=%p\n", ep->ep.name, desc);
 581
 582         maxpacket = usb_endpoint_maxp(desc);
 583
 584         if (((desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK) != ep->index)
 585                         || ep->index == 0
 586                         || desc->bDescriptorType != USB_DT_ENDPOINT
 587                         || maxpacket == 0
 588                         || maxpacket > ep->fifo_size) {
 589                 DBG(DBG_ERR, "ep_enable: Invalid argument");
 590                 return -EINVAL;
 591         }
 592
 593         ep->is_isoc = 0;
 594         ep->is_in = 0;
 595
 596         DBG(DBG_ERR, "%s: EPT_CFG = 0x%lx (maxpacket = %lu)\n",
 597                         ep->ep.name, ep->ept_cfg, maxpacket);
 598
 599         if (usb_endpoint_dir_in(desc)) {
 600                 ep->is_in = 1;
 601                 ep->ept_cfg |= USBA_EPT_DIR_IN;
 602         }
 603
 604         switch (usb_endpoint_type(desc)) {
 605         case USB_ENDPOINT_XFER_CONTROL:
 606                 ep->ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL);
 607                 break;
 608         case USB_ENDPOINT_XFER_ISOC:
 609                 if (!ep->can_isoc) {
 610                         DBG(DBG_ERR, "ep_enable: %s is not isoc capable\n",
 611                                         ep->ep.name);
 612                         return -EINVAL;
 613                 }
 614
 615                 /*
 616                  * Bits 11:12 specify number of _additional_
 617                  * transactions per microframe.
 618                  */
 619                 nr_trans = usb_endpoint_maxp_mult(desc);
 620                 if (nr_trans > 3)
 621                         return -EINVAL;
 622
 623                 ep->is_isoc = 1;
 624                 ep->ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_ISO);
 625                 ep->ept_cfg |= USBA_BF(NB_TRANS, nr_trans);
 626
 627                 break;
 628         case USB_ENDPOINT_XFER_BULK:
 629                 ep->ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK);
 630                 break;
 631         case USB_ENDPOINT_XFER_INT:
 632                 ep->ept_cfg |= USBA_BF(EPT_TYPE, USBA_EPT_TYPE_INT);
 633                 break;
 634         }
 635
 636         spin_lock_irqsave(&ep->udc->lock, flags);
 637
 638         ep->ep.desc = desc;
 639         ep->ep.maxpacket = maxpacket;
 640
 641         usba_ep_writel(ep, CFG, ep->ept_cfg);
 642         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
 643
 644         if (ep->can_dma) {
 645                 u32 ctrl;
 646
 647                 usba_int_enb_set(udc, USBA_BF(EPT_INT, 1 << ep->index) |
 648                                       USBA_BF(DMA_INT, 1 << ep->index));
 649                 ctrl = USBA_AUTO_VALID | USBA_INTDIS_DMA;
 650                 usba_ep_writel(ep, CTL_ENB, ctrl);
 651         } else {
 652                 usba_int_enb_set(udc, USBA_BF(EPT_INT, 1 << ep->index));
 653         }
 654
 655         spin_unlock_irqrestore(&udc->lock, flags);
 656
 657         DBG(DBG_HW, "EPT_CFG%d after init: %#08lx\n", ep->index,
 658                         (unsigned long)usba_ep_readl(ep, CFG));
 659         DBG(DBG_HW, "INT_ENB after init: %#08lx\n",
 660                         (unsigned long)usba_int_enb_get(udc));
 661
 662         return 0;
 663 }
 664
 665 static int usba_ep_disable(struct usb_ep *_ep)
 666 {
 667         struct usba_ep *ep = to_usba_ep(_ep);
 668         struct usba_udc *udc = ep->udc;
 669         LIST_HEAD(req_list);
 670         unsigned long flags;
 671
 672         DBG(DBG_GADGET, "ep_disable: %s\n", ep->ep.name);
 673
 674         spin_lock_irqsave(&udc->lock, flags);
 675
 676         if (!ep->ep.desc) {
 677                 spin_unlock_irqrestore(&udc->lock, flags);
 678                 /* REVISIT because this driver disables endpoints in
 679                  * reset_all_endpoints() before calling disconnect(),
 680                  * most gadget drivers would trigger this non-error ...
 681                  */
 682                 if (udc->gadget.speed != USB_SPEED_UNKNOWN)
 683                         DBG(DBG_ERR, "ep_disable: %s not enabled\n",
 684                                         ep->ep.name);
 685                 return -EINVAL;
 686         }
 687         ep->ep.desc = NULL;
 688
 689         list_splice_init(&ep->queue, &req_list);
 690         if (ep->can_dma) {
 691                 usba_dma_writel(ep, CONTROL, 0);
 692                 usba_dma_writel(ep, ADDRESS, 0);
 693                 usba_dma_readl(ep, STATUS);
 694         }
 695         usba_ep_writel(ep, CTL_DIS, USBA_EPT_ENABLE);
 696         usba_int_enb_clear(udc, USBA_BF(EPT_INT, 1 << ep->index));
 697
 698         request_complete_list(ep, &req_list, -ESHUTDOWN);
 699
 700         spin_unlock_irqrestore(&udc->lock, flags);
 701
 702         return 0;
 703 }
 704
 705 static struct usb_request *
 706 usba_ep_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 707 {
 708         struct usba_request *req;
 709
 710         DBG(DBG_GADGET, "ep_alloc_request: %p, 0x%x\n", _ep, gfp_flags);
 711
 712         req = kzalloc(sizeof(*req), gfp_flags);
 713         if (!req)
 714                 return NULL;
 715
 716         INIT_LIST_HEAD(&req->queue);
 717
 718         return &req->req;
 719 }
 720
 721 static void
 722 usba_ep_free_request(struct usb_ep *_ep, struct usb_request *_req)
 723 {
 724         struct usba_request *req = to_usba_req(_req);
 725
 726         DBG(DBG_GADGET, "ep_free_request: %p, %p\n", _ep, _req);
 727
 728         kfree(req);
 729 }
 730
 731 static int queue_dma(struct usba_udc *udc, struct usba_ep *ep,
 732                 struct usba_request *req, gfp_t gfp_flags)
 733 {
 734         unsigned long flags;
 735         int ret;
 736
 737         DBG(DBG_DMA, "%s: req l/%u d/%pad %c%c%c\n",
 738                 ep->ep.name, req->req.length, &req->req.dma,
 739                 req->req.zero ? 'Z' : 'z',
 740                 req->req.short_not_ok ? 'S' : 's',
 741                 req->req.no_interrupt ? 'I' : 'i');
 742
 743         if (req->req.length > 0x10000) {
 744                 /* Lengths from 0 to 65536 (inclusive) are supported */
 745                 DBG(DBG_ERR, "invalid request length %u\n", req->req.length);
 746                 return -EINVAL;
 747         }
 748
 749         ret = usb_gadget_map_request(&udc->gadget, &req->req, ep->is_in);
 750         if (ret)
 751                 return ret;
 752
 753         req->using_dma = 1;
 754         req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 755                         | USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
 756                         | USBA_DMA_END_BUF_EN;
 757
 758         if (!ep->is_in)
 759                 req->ctrl |= USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 760
 761         /*
 762          * Add this request to the queue and submit for DMA if
 763          * possible. Check if we're still alive first -- we may have
 764          * received a reset since last time we checked.
 765          */
 766         ret = -ESHUTDOWN;
 767         spin_lock_irqsave(&udc->lock, flags);
 768         if (ep->ep.desc) {
 769                 if (list_empty(&ep->queue))
 770                         submit_request(ep, req);
 771
 772                 list_add_tail(&req->queue, &ep->queue);
 773                 ret = 0;
 774         }
 775         spin_unlock_irqrestore(&udc->lock, flags);
 776
 777         return ret;
 778 }
 779
 780 static int
 781 usba_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 782 {
 783         struct usba_request *req = to_usba_req(_req);
 784         struct usba_ep *ep = to_usba_ep(_ep);
 785         struct usba_udc *udc = ep->udc;
 786         unsigned long flags;
 787         int ret;
 788
 789         DBG(DBG_GADGET | DBG_QUEUE | DBG_REQ, "%s: queue req %p, len %u\n",
 790                         ep->ep.name, req, _req->length);
 791
 792         if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN ||
 793             !ep->ep.desc)
 794                 return -ESHUTDOWN;
 795
 796         req->submitted = 0;
 797         req->using_dma = 0;
 798         req->last_transaction = 0;
 799
 800         _req->status = -EINPROGRESS;
 801         _req->actual = 0;
 802
 803         if (ep->can_dma)
 804                 return queue_dma(udc, ep, req, gfp_flags);
 805
 806         /* May have received a reset since last time we checked */
 807         ret = -ESHUTDOWN;
 808         spin_lock_irqsave(&udc->lock, flags);
 809         if (ep->ep.desc) {
 810                 list_add_tail(&req->queue, &ep->queue);
 811
 812                 if ((!ep_is_control(ep) && ep->is_in) ||
 813                         (ep_is_control(ep)
 814                                 && (ep->state == DATA_STAGE_IN
 815                                         || ep->state == STATUS_STAGE_IN)))
 816                         usba_ep_writel(ep, CTL_ENB, USBA_TX_PK_RDY);
 817                 else
 818                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
 819                 ret = 0;
 820         }
 821         spin_unlock_irqrestore(&udc->lock, flags);
 822
 823         return ret;
 824 }
 825
 826 static void
 827 usba_update_req(struct usba_ep *ep, struct usba_request *req, u32 status)
 828 {
 829         req->req.actual = req->req.length - USBA_BFEXT(DMA_BUF_LEN, status);
 830 }
 831
 832 static int stop_dma(struct usba_ep *ep, u32 *pstatus)
 833 {
 834         unsigned int timeout;
 835         u32 status;
 836
 837         /*
 838          * Stop the DMA controller. When writing both CH_EN
 839          * and LINK to 0, the other bits are not affected.
 840          */
 841         usba_dma_writel(ep, CONTROL, 0);
 842
 843         /* Wait for the FIFO to empty */
 844         for (timeout = 40; timeout; --timeout) {
 845                 status = usba_dma_readl(ep, STATUS);
 846                 if (!(status & USBA_DMA_CH_EN))
 847                         break;
 848                 udelay(1);
 849         }
 850
 851         if (pstatus)
 852                 *pstatus = status;
 853
 854         if (timeout == 0) {
 855                 dev_err(&ep->udc->pdev->dev,
 856                         "%s: timed out waiting for DMA FIFO to empty\n",
 857                         ep->ep.name);
 858                 return -ETIMEDOUT;
 859         }
 860
 861         return 0;
 862 }
 863
 864 static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 865 {
 866         struct usba_ep *ep = to_usba_ep(_ep);
 867         struct usba_udc *udc = ep->udc;
 868         struct usba_request *req;
 869         unsigned long flags;
 870         u32 status;
 871
 872         DBG(DBG_GADGET | DBG_QUEUE, "ep_dequeue: %s, req %p\n",
 873                         ep->ep.name, req);
 874
 875         spin_lock_irqsave(&udc->lock, flags);
 876
 877         list_for_each_entry(req, &ep->queue, queue) {
 878                 if (&req->req == _req)
 879                         break;
 880         }
 881
 882         if (&req->req != _req) {
 883                 spin_unlock_irqrestore(&udc->lock, flags);
 884                 return -EINVAL;
 885         }
 886
 887         if (req->using_dma) {
 888                 /*
 889                  * If this request is currently being transferred,
 890                  * stop the DMA controller and reset the FIFO.
 891                  */
 892                 if (ep->queue.next == &req->queue) {
 893                         status = usba_dma_readl(ep, STATUS);
 894                         if (status & USBA_DMA_CH_EN)
 895                                 stop_dma(ep, &status);
 896
 897 #ifdef CONFIG_USB_GADGET_DEBUG_FS
 898                         ep->last_dma_status = status;
 899 #endif
 900
 901                         usba_writel(udc, EPT_RST, 1 << ep->index);
 902
 903                         usba_update_req(ep, req, status);
 904                 }
 905         }
 906
 907         /*
 908          * Errors should stop the queue from advancing until the
 909          * completion function returns.
 910          */
 911         list_del_init(&req->queue);
 912
 913         request_complete(ep, req, -ECONNRESET);
 914
 915         /* Process the next request if any */
 916         submit_next_request(ep);
 917         spin_unlock_irqrestore(&udc->lock, flags);
 918
 919         return 0;
 920 }
 921
 922 static int usba_ep_set_halt(struct usb_ep *_ep, int value)
 923 {
 924         struct usba_ep *ep = to_usba_ep(_ep);
 925         struct usba_udc *udc = ep->udc;
 926         unsigned long flags;
 927         int ret = 0;
 928
 929         DBG(DBG_GADGET, "endpoint %s: %s HALT\n", ep->ep.name,
 930                         value ? "set" : "clear");
 931
 932         if (!ep->ep.desc) {
 933                 DBG(DBG_ERR, "Attempted to halt uninitialized ep %s\n",
 934                                 ep->ep.name);
 935                 return -ENODEV;
 936         }
 937         if (ep->is_isoc) {
 938                 DBG(DBG_ERR, "Attempted to halt isochronous ep %s\n",
 939                                 ep->ep.name);
 940                 return -ENOTTY;
 941         }
 942
 943         spin_lock_irqsave(&udc->lock, flags);
 944
 945         /*
 946          * We can't halt IN endpoints while there are still data to be
 947          * transferred
 948          */
 949         if (!list_empty(&ep->queue)
 950                         || ((value && ep->is_in && (usba_ep_readl(ep, STA)
 951                                         & USBA_BF(BUSY_BANKS, -1L))))) {
 952                 ret = -EAGAIN;
 953         } else {
 954                 if (value)
 955                         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
 956                 else
 957                         usba_ep_writel(ep, CLR_STA,
 958                                         USBA_FORCE_STALL | USBA_TOGGLE_CLR);
 959                 usba_ep_readl(ep, STA);
 960         }
 961
 962         spin_unlock_irqrestore(&udc->lock, flags);
 963
 964         return ret;
 965 }
 966
 967 static int usba_ep_fifo_status(struct usb_ep *_ep)
 968 {
 969         struct usba_ep *ep = to_usba_ep(_ep);
 970
 971         return USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
 972 }
 973
 974 static void usba_ep_fifo_flush(struct usb_ep *_ep)
 975 {
 976         struct usba_ep *ep = to_usba_ep(_ep);
 977         struct usba_udc *udc = ep->udc;
 978
 979         usba_writel(udc, EPT_RST, 1 << ep->index);
 980 }
 981
 982 static const struct usb_ep_ops usba_ep_ops = {
 983         .enable         = usba_ep_enable,
 984         .disable        = usba_ep_disable,
 985         .alloc_request  = usba_ep_alloc_request,
 986         .free_request   = usba_ep_free_request,
 987         .queue          = usba_ep_queue,
 988         .dequeue        = usba_ep_dequeue,
 989         .set_halt       = usba_ep_set_halt,
 990         .fifo_status    = usba_ep_fifo_status,
 991         .fifo_flush     = usba_ep_fifo_flush,
 992 };
 993
 994 static int usba_udc_get_frame(struct usb_gadget *gadget)
 995 {
 996         struct usba_udc *udc = to_usba_udc(gadget);
 997
 998         return USBA_BFEXT(FRAME_NUMBER, usba_readl(udc, FNUM));
 999 }
1000
1001 static int usba_udc_wakeup(struct usb_gadget *gadget)
1002 {
1003         struct usba_udc *udc = to_usba_udc(gadget);
1004         unsigned long flags;
1005         u32 ctrl;
1006         int ret = -EINVAL;
1007
1008         spin_lock_irqsave(&udc->lock, flags);
1009         if (udc->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1010                 ctrl = usba_readl(udc, CTRL);
1011                 usba_writel(udc, CTRL, ctrl | USBA_REMOTE_WAKE_UP);
1012                 ret = 0;
1013         }
1014         spin_unlock_irqrestore(&udc->lock, flags);
1015
1016         return ret;
1017 }
1018
1019 static int
1020 usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
1021 {
1022         struct usba_udc *udc = to_usba_udc(gadget);
1023         unsigned long flags;
1024
1025         gadget->is_selfpowered = (is_selfpowered != 0);
1026         spin_lock_irqsave(&udc->lock, flags);
1027         if (is_selfpowered)
1028                 udc->devstatus |= 1 << USB_DEVICE_SELF_POWERED;
1029         else
1030                 udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
1031         spin_unlock_irqrestore(&udc->lock, flags);
1032
1033         return 0;
1034 }
1035
1036 static int atmel_usba_start(struct usb_gadget *gadget,
1037                 struct usb_gadget_driver *driver);
1038 static int atmel_usba_stop(struct usb_gadget *gadget);
1039
1040 static struct usb_ep *atmel_usba_match_ep(struct usb_gadget *gadget,
1041                                 struct usb_endpoint_descriptor  *desc,
1042                                 struct usb_ss_ep_comp_descriptor *ep_comp)
1043 {
1044         struct usb_ep   *_ep;
1045         struct usba_ep *ep;
1046
1047         /* Look at endpoints until an unclaimed one looks usable */
1048         list_for_each_entry(_ep, &gadget->ep_list, ep_list) {
1049                 if (usb_gadget_ep_match_desc(gadget, _ep, desc, ep_comp))
1050                         goto found_ep;
1051         }
1052         /* Fail */
1053         return NULL;
1054
1055 found_ep:
1056
1057         if (fifo_mode == 0) {
1058                 /* Optimize hw fifo size based on ep type and other info */
1059                 ep = to_usba_ep(_ep);
1060
1061                 switch (usb_endpoint_type(desc)) {
1062                 case USB_ENDPOINT_XFER_CONTROL:
1063                         break;
1064
1065                 case USB_ENDPOINT_XFER_ISOC:
1066                         ep->fifo_size = 1024;
1067                         ep->nr_banks = 2;
1068                         break;
1069
1070                 case USB_ENDPOINT_XFER_BULK:
1071                         ep->fifo_size = 512;
1072                         ep->nr_banks = 1;
1073                         break;
1074
1075                 case USB_ENDPOINT_XFER_INT:
1076                         if (desc->wMaxPacketSize == 0)
1077                                 ep->fifo_size =
1078                                     roundup_pow_of_two(_ep->maxpacket_limit);
1079                         else
1080                                 ep->fifo_size =
1081                                     roundup_pow_of_two(le16_to_cpu(desc->wMaxPacketSize));
1082                         ep->nr_banks = 1;
1083                         break;
1084                 }
1085
1086                 /* It might be a little bit late to set this */
1087                 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
1088
1089                 /* Generate ept_cfg basd on FIFO size and number of banks */
1090                 if (ep->fifo_size  <= 8)
1091                         ep->ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
1092                 else
1093                         /* LSB is bit 1, not 0 */
1094                         ep->ept_cfg =
1095                                 USBA_BF(EPT_SIZE, fls(ep->fifo_size - 1) - 3);
1096
1097                 ep->ept_cfg |= USBA_BF(BK_NUMBER, ep->nr_banks);
1098
1099                 ep->udc->configured_ep++;
1100         }
1101
1102         return _ep;
1103 }
1104
1105 static const struct usb_gadget_ops usba_udc_ops = {
1106         .get_frame              = usba_udc_get_frame,
1107         .wakeup                 = usba_udc_wakeup,
1108         .set_selfpowered        = usba_udc_set_selfpowered,
1109         .udc_start              = atmel_usba_start,
1110         .udc_stop               = atmel_usba_stop,
1111         .match_ep               = atmel_usba_match_ep,
1112 };
1113
1114 static struct usb_endpoint_descriptor usba_ep0_desc = {
1115         .bLength = USB_DT_ENDPOINT_SIZE,
1116         .bDescriptorType = USB_DT_ENDPOINT,
1117         .bEndpointAddress = 0,
1118         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
1119         .wMaxPacketSize = cpu_to_le16(64),
1120         /* FIXME: I have no idea what to put here */
1121         .bInterval = 1,
1122 };
1123
1124 static struct usb_gadget usba_gadget_template = {
1125         .ops            = &usba_udc_ops,
1126         .max_speed      = USB_SPEED_HIGH,
1127         .name           = "atmel_usba_udc",
1128 };
1129
1130 /*
1131  * Called with interrupts disabled and udc->lock held.
1132  */
1133 static void reset_all_endpoints(struct usba_udc *udc)
1134 {
1135         struct usba_ep *ep;
1136         struct usba_request *req, *tmp_req;
1137
1138         usba_writel(udc, EPT_RST, ~0UL);
1139
1140         ep = to_usba_ep(udc->gadget.ep0);
1141         list_for_each_entry_safe(req, tmp_req, &ep->queue, queue) {
1142                 list_del_init(&req->queue);
1143                 request_complete(ep, req, -ECONNRESET);
1144         }
1145 }
1146
1147 static struct usba_ep *get_ep_by_addr(struct usba_udc *udc, u16 wIndex)
1148 {
1149         struct usba_ep *ep;
1150
1151         if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
1152                 return to_usba_ep(udc->gadget.ep0);
1153
1154         list_for_each_entry (ep, &udc->gadget.ep_list, ep.ep_list) {
1155                 u8 bEndpointAddress;
1156
1157                 if (!ep->ep.desc)
1158                         continue;
1159                 bEndpointAddress = ep->ep.desc->bEndpointAddress;
1160                 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
1161                         continue;
1162                 if ((bEndpointAddress & USB_ENDPOINT_NUMBER_MASK)
1163                                 == (wIndex & USB_ENDPOINT_NUMBER_MASK))
1164                         return ep;
1165         }
1166
1167         return NULL;
1168 }
1169
1170 /* Called with interrupts disabled and udc->lock held */
1171 static inline void set_protocol_stall(struct usba_udc *udc, struct usba_ep *ep)
1172 {
1173         usba_ep_writel(ep, SET_STA, USBA_FORCE_STALL);
1174         ep->state = WAIT_FOR_SETUP;
1175 }
1176
1177 static inline int is_stalled(struct usba_udc *udc, struct usba_ep *ep)
1178 {
1179         if (usba_ep_readl(ep, STA) & USBA_FORCE_STALL)
1180                 return 1;
1181         return 0;
1182 }
1183
1184 static inline void set_address(struct usba_udc *udc, unsigned int addr)
1185 {
1186         u32 regval;
1187
1188         DBG(DBG_BUS, "setting address %u...\n", addr);
1189         regval = usba_readl(udc, CTRL);
1190         regval = USBA_BFINS(DEV_ADDR, addr, regval);
1191         usba_writel(udc, CTRL, regval);
1192 }
1193
1194 static int do_test_mode(struct usba_udc *udc)
1195 {
1196         static const char test_packet_buffer[] = {
1197                 /* JKJKJKJK * 9 */
1198                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
1199                 /* JJKKJJKK * 8 */
1200                 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA,
1201                 /* JJKKJJKK * 8 */
1202                 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE, 0xEE,
1203                 /* JJJJJJJKKKKKKK * 8 */
1204                 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1205                 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
1206                 /* JJJJJJJK * 8 */
1207                 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD,
1208                 /* {JKKKKKKK * 10}, JK */
1209                 0xFC, 0x7E, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD, 0x7E
1210         };
1211         struct usba_ep *ep;
1212         struct device *dev = &udc->pdev->dev;
1213         int test_mode;
1214
1215         test_mode = udc->test_mode;
1216
1217         /* Start from a clean slate */
1218         reset_all_endpoints(udc);
1219
1220         switch (test_mode) {
1221         case 0x0100:
1222                 /* Test_J */
1223                 usba_writel(udc, TST, USBA_TST_J_MODE);
1224                 dev_info(dev, "Entering Test_J mode...\n");
1225                 break;
1226         case 0x0200:
1227                 /* Test_K */
1228                 usba_writel(udc, TST, USBA_TST_K_MODE);
1229                 dev_info(dev, "Entering Test_K mode...\n");
1230                 break;
1231         case 0x0300:
1232                 /*
1233                  * Test_SE0_NAK: Force high-speed mode and set up ep0
1234                  * for Bulk IN transfers
1235                  */
1236                 ep = &udc->usba_ep[0];
1237                 usba_writel(udc, TST,
1238                                 USBA_BF(SPEED_CFG, USBA_SPEED_CFG_FORCE_HIGH));
1239                 usba_ep_writel(ep, CFG,
1240                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1241                                 | USBA_EPT_DIR_IN
1242                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1243                                 | USBA_BF(BK_NUMBER, 1));
1244                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1245                         set_protocol_stall(udc, ep);
1246                         dev_err(dev, "Test_SE0_NAK: ep0 not mapped\n");
1247                 } else {
1248                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1249                         dev_info(dev, "Entering Test_SE0_NAK mode...\n");
1250                 }
1251                 break;
1252         case 0x0400:
1253                 /* Test_Packet */
1254                 ep = &udc->usba_ep[0];
1255                 usba_ep_writel(ep, CFG,
1256                                 USBA_BF(EPT_SIZE, USBA_EPT_SIZE_64)
1257                                 | USBA_EPT_DIR_IN
1258                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_BULK)
1259                                 | USBA_BF(BK_NUMBER, 1));
1260                 if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED)) {
1261                         set_protocol_stall(udc, ep);
1262                         dev_err(dev, "Test_Packet: ep0 not mapped\n");
1263                 } else {
1264                         usba_ep_writel(ep, CTL_ENB, USBA_EPT_ENABLE);
1265                         usba_writel(udc, TST, USBA_TST_PKT_MODE);
1266                         memcpy_toio(ep->fifo, test_packet_buffer,
1267                                         sizeof(test_packet_buffer));
1268                         usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1269                         dev_info(dev, "Entering Test_Packet mode...\n");
1270                 }
1271                 break;
1272         default:
1273                 dev_err(dev, "Invalid test mode: 0x%04x\n", test_mode);
1274                 return -EINVAL;
1275         }
1276
1277         return 0;
1278 }
1279
1280 /* Avoid overly long expressions */
1281 static inline bool feature_is_dev_remote_wakeup(struct usb_ctrlrequest *crq)
1282 {
1283         if (crq->wValue == cpu_to_le16(USB_DEVICE_REMOTE_WAKEUP))
1284                 return true;
1285         return false;
1286 }
1287
1288 static inline bool feature_is_dev_test_mode(struct usb_ctrlrequest *crq)
1289 {
1290         if (crq->wValue == cpu_to_le16(USB_DEVICE_TEST_MODE))
1291                 return true;
1292         return false;
1293 }
1294
1295 static inline bool feature_is_ep_halt(struct usb_ctrlrequest *crq)
1296 {
1297         if (crq->wValue == cpu_to_le16(USB_ENDPOINT_HALT))
1298                 return true;
1299         return false;
1300 }
1301
1302 static int handle_ep0_setup(struct usba_udc *udc, struct usba_ep *ep,
1303                 struct usb_ctrlrequest *crq)
1304 {
1305         int retval = 0;
1306
1307         switch (crq->bRequest) {
1308         case USB_REQ_GET_STATUS: {
1309                 u16 status;
1310
1311                 if (crq->bRequestType == (USB_DIR_IN | USB_RECIP_DEVICE)) {
1312                         status = cpu_to_le16(udc->devstatus);
1313                 } else if (crq->bRequestType
1314                                 == (USB_DIR_IN | USB_RECIP_INTERFACE)) {
1315                         status = cpu_to_le16(0);
1316                 } else if (crq->bRequestType
1317                                 == (USB_DIR_IN | USB_RECIP_ENDPOINT)) {
1318                         struct usba_ep *target;
1319
1320                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1321                         if (!target)
1322                                 goto stall;
1323
1324                         status = 0;
1325                         if (is_stalled(udc, target))
1326                                 status |= cpu_to_le16(1);
1327                 } else
1328                         goto delegate;
1329
1330                 /* Write directly to the FIFO. No queueing is done. */
1331                 if (crq->wLength != cpu_to_le16(sizeof(status)))
1332                         goto stall;
1333                 ep->state = DATA_STAGE_IN;
1334                 writew_relaxed(status, ep->fifo);
1335                 usba_ep_writel(ep, SET_STA, USBA_TX_PK_RDY);
1336                 break;
1337         }
1338
1339         case USB_REQ_CLEAR_FEATURE: {
1340                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1341                         if (feature_is_dev_remote_wakeup(crq))
1342                                 udc->devstatus
1343                                         &= ~(1 << USB_DEVICE_REMOTE_WAKEUP);
1344                         else
1345                                 /* Can't CLEAR_FEATURE TEST_MODE */
1346                                 goto stall;
1347                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1348                         struct usba_ep *target;
1349
1350                         if (crq->wLength != cpu_to_le16(0)
1351                                         || !feature_is_ep_halt(crq))
1352                                 goto stall;
1353                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1354                         if (!target)
1355                                 goto stall;
1356
1357                         usba_ep_writel(target, CLR_STA, USBA_FORCE_STALL);
1358                         if (target->index != 0)
1359                                 usba_ep_writel(target, CLR_STA,
1360                                                 USBA_TOGGLE_CLR);
1361                 } else {
1362                         goto delegate;
1363                 }
1364
1365                 send_status(udc, ep);
1366                 break;
1367         }
1368
1369         case USB_REQ_SET_FEATURE: {
1370                 if (crq->bRequestType == USB_RECIP_DEVICE) {
1371                         if (feature_is_dev_test_mode(crq)) {
1372                                 send_status(udc, ep);
1373                                 ep->state = STATUS_STAGE_TEST;
1374                                 udc->test_mode = le16_to_cpu(crq->wIndex);
1375                                 return 0;
1376                         } else if (feature_is_dev_remote_wakeup(crq)) {
1377                                 udc->devstatus |= 1 << USB_DEVICE_REMOTE_WAKEUP;
1378                         } else {
1379                                 goto stall;
1380                         }
1381                 } else if (crq->bRequestType == USB_RECIP_ENDPOINT) {
1382                         struct usba_ep *target;
1383
1384                         if (crq->wLength != cpu_to_le16(0)
1385                                         || !feature_is_ep_halt(crq))
1386                                 goto stall;
1387
1388                         target = get_ep_by_addr(udc, le16_to_cpu(crq->wIndex));
1389                         if (!target)
1390                                 goto stall;
1391
1392                         usba_ep_writel(target, SET_STA, USBA_FORCE_STALL);
1393                 } else
1394                         goto delegate;
1395
1396                 send_status(udc, ep);
1397                 break;
1398         }
1399
1400         case USB_REQ_SET_ADDRESS:
1401                 if (crq->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE))
1402                         goto delegate;
1403
1404                 set_address(udc, le16_to_cpu(crq->wValue));
1405                 send_status(udc, ep);
1406                 ep->state = STATUS_STAGE_ADDR;
1407                 break;
1408
1409         default:
1410 delegate:
1411                 spin_unlock(&udc->lock);
1412                 retval = udc->driver->setup(&udc->gadget, crq);
1413                 spin_lock(&udc->lock);
1414         }
1415
1416         return retval;
1417
1418 stall:
1419         pr_err("udc: %s: Invalid setup request: %02x.%02x v%04x i%04x l%d, "
1420                 "halting endpoint...\n",
1421                 ep->ep.name, crq->bRequestType, crq->bRequest,
1422                 le16_to_cpu(crq->wValue), le16_to_cpu(crq->wIndex),
1423                 le16_to_cpu(crq->wLength));
1424         set_protocol_stall(udc, ep);
1425         return -1;
1426 }
1427
1428 static void usba_control_irq(struct usba_udc *udc, struct usba_ep *ep)
1429 {
1430         struct usba_request *req;
1431         u32 epstatus;
1432         u32 epctrl;
1433
1434 restart:
1435         epstatus = usba_ep_readl(ep, STA);
1436         epctrl = usba_ep_readl(ep, CTL);
1437
1438         DBG(DBG_INT, "%s [%d]: s/%08x c/%08x\n",
1439                         ep->ep.name, ep->state, epstatus, epctrl);
1440
1441         req = NULL;
1442         if (!list_empty(&ep->queue))
1443                 req = list_entry(ep->queue.next,
1444                                  struct usba_request, queue);
1445
1446         if ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1447                 if (req->submitted)
1448                         next_fifo_transaction(ep, req);
1449                 else
1450                         submit_request(ep, req);
1451
1452                 if (req->last_transaction) {
1453                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1454                         usba_ep_writel(ep, CTL_ENB, USBA_TX_COMPLETE);
1455                 }
1456                 goto restart;
1457         }
1458         if ((epstatus & epctrl) & USBA_TX_COMPLETE) {
1459                 usba_ep_writel(ep, CLR_STA, USBA_TX_COMPLETE);
1460
1461                 switch (ep->state) {
1462                 case DATA_STAGE_IN:
1463                         usba_ep_writel(ep, CTL_ENB, USBA_RX_BK_RDY);
1464                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1465                         ep->state = STATUS_STAGE_OUT;
1466                         break;
1467                 case STATUS_STAGE_ADDR:
1468                         /* Activate our new address */
1469                         usba_writel(udc, CTRL, (usba_readl(udc, CTRL)
1470                                                 | USBA_FADDR_EN));
1471                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1472                         ep->state = WAIT_FOR_SETUP;
1473                         break;
1474                 case STATUS_STAGE_IN:
1475                         if (req) {
1476                                 list_del_init(&req->queue);
1477                                 request_complete(ep, req, 0);
1478                                 submit_next_request(ep);
1479                         }
1480                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1481                         ep->state = WAIT_FOR_SETUP;
1482                         break;
1483                 case STATUS_STAGE_TEST:
1484                         usba_ep_writel(ep, CTL_DIS, USBA_TX_COMPLETE);
1485                         ep->state = WAIT_FOR_SETUP;
1486                         if (do_test_mode(udc))
1487                                 set_protocol_stall(udc, ep);
1488                         break;
1489                 default:
1490                         pr_err("udc: %s: TXCOMP: Invalid endpoint state %d, "
1491                                 "halting endpoint...\n",
1492                                 ep->ep.name, ep->state);
1493                         set_protocol_stall(udc, ep);
1494                         break;
1495                 }
1496
1497                 goto restart;
1498         }
1499         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1500                 switch (ep->state) {
1501                 case STATUS_STAGE_OUT:
1502                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1503                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1504
1505                         if (req) {
1506                                 list_del_init(&req->queue);
1507                                 request_complete(ep, req, 0);
1508                         }
1509                         ep->state = WAIT_FOR_SETUP;
1510                         break;
1511
1512                 case DATA_STAGE_OUT:
1513                         receive_data(ep);
1514                         break;
1515
1516                 default:
1517                         usba_ep_writel(ep, CLR_STA, USBA_RX_BK_RDY);
1518                         usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1519                         pr_err("udc: %s: RXRDY: Invalid endpoint state %d, "
1520                                 "halting endpoint...\n",
1521                                 ep->ep.name, ep->state);
1522                         set_protocol_stall(udc, ep);
1523                         break;
1524                 }
1525
1526                 goto restart;
1527         }
1528         if (epstatus & USBA_RX_SETUP) {
1529                 union {
1530                         struct usb_ctrlrequest crq;
1531                         unsigned long data[2];
1532                 } crq;
1533                 unsigned int pkt_len;
1534                 int ret;
1535
1536                 if (ep->state != WAIT_FOR_SETUP) {
1537                         /*
1538                          * Didn't expect a SETUP packet at this
1539                          * point. Clean up any pending requests (which
1540                          * may be successful).
1541                          */
1542                         int status = -EPROTO;
1543
1544                         /*
1545                          * RXRDY and TXCOMP are dropped when SETUP
1546                          * packets arrive.  Just pretend we received
1547                          * the status packet.
1548                          */
1549                         if (ep->state == STATUS_STAGE_OUT
1550                                         || ep->state == STATUS_STAGE_IN) {
1551                                 usba_ep_writel(ep, CTL_DIS, USBA_RX_BK_RDY);
1552                                 status = 0;
1553                         }
1554
1555                         if (req) {
1556                                 list_del_init(&req->queue);
1557                                 request_complete(ep, req, status);
1558                         }
1559                 }
1560
1561                 pkt_len = USBA_BFEXT(BYTE_COUNT, usba_ep_readl(ep, STA));
1562                 DBG(DBG_HW, "Packet length: %u\n", pkt_len);
1563                 if (pkt_len != sizeof(crq)) {
1564                         pr_warn("udc: Invalid packet length %u (expected %zu)\n",
1565                                 pkt_len, sizeof(crq));
1566                         set_protocol_stall(udc, ep);
1567                         return;
1568                 }
1569
1570                 DBG(DBG_FIFO, "Copying ctrl request from 0x%p:\n", ep->fifo);
1571                 memcpy_fromio(crq.data, ep->fifo, sizeof(crq));
1572
1573                 /* Free up one bank in the FIFO so that we can
1574                  * generate or receive a reply right away. */
1575                 usba_ep_writel(ep, CLR_STA, USBA_RX_SETUP);
1576
1577                 /* printk(KERN_DEBUG "setup: %d: %02x.%02x\n",
1578                         ep->state, crq.crq.bRequestType,
1579                         crq.crq.bRequest); */
1580
1581                 if (crq.crq.bRequestType & USB_DIR_IN) {
1582                         /*
1583                          * The USB 2.0 spec states that "if wLength is
1584                          * zero, there is no data transfer phase."
1585                          * However, testusb #14 seems to actually
1586                          * expect a data phase even if wLength = 0...
1587                          */
1588                         ep->state = DATA_STAGE_IN;
1589                 } else {
1590                         if (crq.crq.wLength != cpu_to_le16(0))
1591                                 ep->state = DATA_STAGE_OUT;
1592                         else
1593                                 ep->state = STATUS_STAGE_IN;
1594                 }
1595
1596                 ret = -1;
1597                 if (ep->index == 0)
1598                         ret = handle_ep0_setup(udc, ep, &crq.crq);
1599                 else {
1600                         spin_unlock(&udc->lock);
1601                         ret = udc->driver->setup(&udc->gadget, &crq.crq);
1602                         spin_lock(&udc->lock);
1603                 }
1604
1605                 DBG(DBG_BUS, "req %02x.%02x, length %d, state %d, ret %d\n",
1606                         crq.crq.bRequestType, crq.crq.bRequest,
1607                         le16_to_cpu(crq.crq.wLength), ep->state, ret);
1608
1609                 if (ret < 0) {
1610                         /* Let the host know that we failed */
1611                         set_protocol_stall(udc, ep);
1612                 }
1613         }
1614 }
1615
1616 static void usba_ep_irq(struct usba_udc *udc, struct usba_ep *ep)
1617 {
1618         struct usba_request *req;
1619         u32 epstatus;
1620         u32 epctrl;
1621
1622         epstatus = usba_ep_readl(ep, STA);
1623         epctrl = usba_ep_readl(ep, CTL);
1624
1625         DBG(DBG_INT, "%s: interrupt, status: 0x%08x\n", ep->ep.name, epstatus);
1626
1627         while ((epctrl & USBA_TX_PK_RDY) && !(epstatus & USBA_TX_PK_RDY)) {
1628                 DBG(DBG_BUS, "%s: TX PK ready\n", ep->ep.name);
1629
1630                 if (list_empty(&ep->queue)) {
1631                         dev_warn(&udc->pdev->dev, "ep_irq: queue empty\n");
1632                         usba_ep_writel(ep, CTL_DIS, USBA_TX_PK_RDY);
1633                         return;
1634                 }
1635
1636                 req = list_entry(ep->queue.next, struct usba_request, queue);
1637
1638                 if (req->using_dma) {
1639                         /* Send a zero-length packet */
1640                         usba_ep_writel(ep, SET_STA,
1641                                         USBA_TX_PK_RDY);
1642                         usba_ep_writel(ep, CTL_DIS,
1643                                         USBA_TX_PK_RDY);
1644                         list_del_init(&req->queue);
1645                         submit_next_request(ep);
1646                         request_complete(ep, req, 0);
1647                 } else {
1648                         if (req->submitted)
1649                                 next_fifo_transaction(ep, req);
1650                         else
1651                                 submit_request(ep, req);
1652
1653                         if (req->last_transaction) {
1654                                 list_del_init(&req->queue);
1655                                 submit_next_request(ep);
1656                                 request_complete(ep, req, 0);
1657                         }
1658                 }
1659
1660                 epstatus = usba_ep_readl(ep, STA);
1661                 epctrl = usba_ep_readl(ep, CTL);
1662         }
1663         if ((epstatus & epctrl) & USBA_RX_BK_RDY) {
1664                 DBG(DBG_BUS, "%s: RX data ready\n", ep->ep.name);
1665                 receive_data(ep);
1666         }
1667 }
1668
1669 static void usba_dma_irq(struct usba_udc *udc, struct usba_ep *ep)
1670 {
1671         struct usba_request *req;
1672         u32 status, control, pending;
1673
1674         status = usba_dma_readl(ep, STATUS);
1675         control = usba_dma_readl(ep, CONTROL);
1676 #ifdef CONFIG_USB_GADGET_DEBUG_FS
1677         ep->last_dma_status = status;
1678 #endif
1679         pending = status & control;
1680         DBG(DBG_INT | DBG_DMA, "dma irq, s/%#08x, c/%#08x\n", status, control);
1681
1682         if (status & USBA_DMA_CH_EN) {
1683                 dev_err(&udc->pdev->dev,
1684                         "DMA_CH_EN is set after transfer is finished!\n");
1685                 dev_err(&udc->pdev->dev,
1686                         "status=%#08x, pending=%#08x, control=%#08x\n",
1687                         status, pending, control);
1688
1689                 /*
1690                  * try to pretend nothing happened. We might have to
1691                  * do something here...
1692                  */
1693         }
1694
1695         if (list_empty(&ep->queue))
1696                 /* Might happen if a reset comes along at the right moment */
1697                 return;
1698
1699         if (pending & (USBA_DMA_END_TR_ST | USBA_DMA_END_BUF_ST)) {
1700                 req = list_entry(ep->queue.next, struct usba_request, queue);
1701                 usba_update_req(ep, req, status);
1702
1703                 list_del_init(&req->queue);
1704                 submit_next_request(ep);
1705                 request_complete(ep, req, 0);
1706         }
1707 }
1708
1709 static int start_clock(struct usba_udc *udc);
1710 static void stop_clock(struct usba_udc *udc);
1711
1712 static irqreturn_t usba_udc_irq(int irq, void *devid)
1713 {
1714         struct usba_udc *udc = devid;
1715         u32 status, int_enb;
1716         u32 dma_status;
1717         u32 ep_status;
1718
1719         spin_lock(&udc->lock);
1720
1721         int_enb = usba_int_enb_get(udc);
1722         status = usba_readl(udc, INT_STA) & (int_enb | USBA_HIGH_SPEED);
1723         DBG(DBG_INT, "irq, status=%#08x\n", status);
1724
1725         if (status & USBA_DET_SUSPEND) {
1726                 usba_writel(udc, INT_CLR, USBA_DET_SUSPEND|USBA_WAKE_UP);
1727                 usba_int_enb_set(udc, USBA_WAKE_UP);
1728                 usba_int_enb_clear(udc, USBA_DET_SUSPEND);
1729                 udc->suspended = true;
1730                 toggle_bias(udc, 0);
1731                 udc->bias_pulse_needed = true;
1732                 stop_clock(udc);
1733                 DBG(DBG_BUS, "Suspend detected\n");
1734                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1735                                 && udc->driver && udc->driver->suspend) {
1736                         spin_unlock(&udc->lock);
1737                         udc->driver->suspend(&udc->gadget);
1738                         spin_lock(&udc->lock);
1739                 }
1740         }
1741
1742         if (status & USBA_WAKE_UP) {
1743                 start_clock(udc);
1744                 toggle_bias(udc, 1);
1745                 usba_writel(udc, INT_CLR, USBA_WAKE_UP);
1746                 DBG(DBG_BUS, "Wake Up CPU detected\n");
1747         }
1748
1749         if (status & USBA_END_OF_RESUME) {
1750                 udc->suspended = false;
1751                 usba_writel(udc, INT_CLR, USBA_END_OF_RESUME);
1752                 usba_int_enb_clear(udc, USBA_WAKE_UP);
1753                 usba_int_enb_set(udc, USBA_DET_SUSPEND);
1754                 generate_bias_pulse(udc);
1755                 DBG(DBG_BUS, "Resume detected\n");
1756                 if (udc->gadget.speed != USB_SPEED_UNKNOWN
1757                                 && udc->driver && udc->driver->resume) {
1758                         spin_unlock(&udc->lock);
1759                         udc->driver->resume(&udc->gadget);
1760                         spin_lock(&udc->lock);
1761                 }
1762         }
1763
1764         dma_status = USBA_BFEXT(DMA_INT, status);
1765         if (dma_status) {
1766                 int i;
1767
1768                 usba_int_enb_set(udc, USBA_DET_SUSPEND);
1769
1770                 for (i = 1; i <= USBA_NR_DMAS; i++)
1771                         if (dma_status & (1 << i))
1772                                 usba_dma_irq(udc, &udc->usba_ep[i]);
1773         }
1774
1775         ep_status = USBA_BFEXT(EPT_INT, status);
1776         if (ep_status) {
1777                 int i;
1778
1779                 usba_int_enb_set(udc, USBA_DET_SUSPEND);
1780
1781                 for (i = 0; i < udc->num_ep; i++)
1782                         if (ep_status & (1 << i)) {
1783                                 if (ep_is_control(&udc->usba_ep[i]))
1784                                         usba_control_irq(udc, &udc->usba_ep[i]);
1785                                 else
1786                                         usba_ep_irq(udc, &udc->usba_ep[i]);
1787                         }
1788         }
1789
1790         if (status & USBA_END_OF_RESET) {
1791                 struct usba_ep *ep0, *ep;
1792                 int i, n;
1793
1794                 usba_writel(udc, INT_CLR,
1795                         USBA_END_OF_RESET|USBA_END_OF_RESUME
1796                         |USBA_DET_SUSPEND|USBA_WAKE_UP);
1797                 generate_bias_pulse(udc);
1798                 reset_all_endpoints(udc);
1799
1800                 if (udc->gadget.speed != USB_SPEED_UNKNOWN && udc->driver) {
1801                         udc->gadget.speed = USB_SPEED_UNKNOWN;
1802                         spin_unlock(&udc->lock);
1803                         usb_gadget_udc_reset(&udc->gadget, udc->driver);
1804                         spin_lock(&udc->lock);
1805                 }
1806
1807                 if (status & USBA_HIGH_SPEED)
1808                         udc->gadget.speed = USB_SPEED_HIGH;
1809                 else
1810                         udc->gadget.speed = USB_SPEED_FULL;
1811                 DBG(DBG_BUS, "%s bus reset detected\n",
1812                     usb_speed_string(udc->gadget.speed));
1813
1814                 ep0 = &udc->usba_ep[0];
1815                 ep0->ep.desc = &usba_ep0_desc;
1816                 ep0->state = WAIT_FOR_SETUP;
1817                 usba_ep_writel(ep0, CFG,
1818                                 (USBA_BF(EPT_SIZE, EP0_EPT_SIZE)
1819                                 | USBA_BF(EPT_TYPE, USBA_EPT_TYPE_CONTROL)
1820                                 | USBA_BF(BK_NUMBER, USBA_BK_NUMBER_ONE)));
1821                 usba_ep_writel(ep0, CTL_ENB,
1822                                 USBA_EPT_ENABLE | USBA_RX_SETUP);
1823
1824                 /* If we get reset while suspended... */
1825                 udc->suspended = false;
1826                 usba_int_enb_clear(udc, USBA_WAKE_UP);
1827
1828                 usba_int_enb_set(udc, USBA_BF(EPT_INT, 1) |
1829                                       USBA_DET_SUSPEND | USBA_END_OF_RESUME);
1830
1831                 /*
1832                  * Unclear why we hit this irregularly, e.g. in usbtest,
1833                  * but it's clearly harmless...
1834                  */
1835                 if (!(usba_ep_readl(ep0, CFG) & USBA_EPT_MAPPED))
1836                         dev_err(&udc->pdev->dev,
1837                                 "ODD: EP0 configuration is invalid!\n");
1838
1839                 /* Preallocate other endpoints */
1840                 n = fifo_mode ? udc->num_ep : udc->configured_ep;
1841                 for (i = 1; i < n; i++) {
1842                         ep = &udc->usba_ep[i];
1843                         usba_ep_writel(ep, CFG, ep->ept_cfg);
1844                         if (!(usba_ep_readl(ep, CFG) & USBA_EPT_MAPPED))
1845                                 dev_err(&udc->pdev->dev,
1846                                         "ODD: EP%d configuration is invalid!\n", i);
1847                 }
1848         }
1849
1850         spin_unlock(&udc->lock);
1851
1852         return IRQ_HANDLED;
1853 }
1854
1855 static int start_clock(struct usba_udc *udc)
1856 {
1857         int ret;
1858
1859         if (udc->clocked)
1860                 return 0;
1861
1862         pm_stay_awake(&udc->pdev->dev);
1863
1864         ret = clk_prepare_enable(udc->pclk);
1865         if (ret)
1866                 return ret;
1867         ret = clk_prepare_enable(udc->hclk);
1868         if (ret) {
1869                 clk_disable_unprepare(udc->pclk);
1870                 return ret;
1871         }
1872
1873         udc->clocked = true;
1874         return 0;
1875 }
1876
1877 static void stop_clock(struct usba_udc *udc)
1878 {
1879         if (!udc->clocked)
1880                 return;
1881
1882         clk_disable_unprepare(udc->hclk);
1883         clk_disable_unprepare(udc->pclk);
1884
1885         udc->clocked = false;
1886
1887         pm_relax(&udc->pdev->dev);
1888 }
1889
1890 static int usba_start(struct usba_udc *udc)
1891 {
1892         unsigned long flags;
1893         int ret;
1894
1895         ret = start_clock(udc);
1896         if (ret)
1897                 return ret;
1898
1899         if (udc->suspended)
1900                 return 0;
1901
1902         spin_lock_irqsave(&udc->lock, flags);
1903         toggle_bias(udc, 1);
1904         usba_writel(udc, CTRL, USBA_ENABLE_MASK);
1905         /* Clear all requested and pending interrupts... */
1906         usba_writel(udc, INT_ENB, 0);
1907         udc->int_enb_cache = 0;
1908         usba_writel(udc, INT_CLR,
1909                 USBA_END_OF_RESET|USBA_END_OF_RESUME
1910                 |USBA_DET_SUSPEND|USBA_WAKE_UP);
1911         /* ...and enable just 'reset' IRQ to get us started */
1912         usba_int_enb_set(udc, USBA_END_OF_RESET);
1913         spin_unlock_irqrestore(&udc->lock, flags);
1914
1915         return 0;
1916 }
1917
1918 static void usba_stop(struct usba_udc *udc)
1919 {
1920         unsigned long flags;
1921
1922         if (udc->suspended)
1923                 return;
1924
1925         spin_lock_irqsave(&udc->lock, flags);
1926         udc->gadget.speed = USB_SPEED_UNKNOWN;
1927         reset_all_endpoints(udc);
1928
1929         /* This will also disable the DP pullup */
1930         toggle_bias(udc, 0);
1931         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
1932         spin_unlock_irqrestore(&udc->lock, flags);
1933
1934         stop_clock(udc);
1935 }
1936
1937 static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
1938 {
1939         struct usba_udc *udc = devid;
1940         int vbus;
1941
1942         /* debounce */
1943         udelay(10);
1944
1945         mutex_lock(&udc->vbus_mutex);
1946
1947         vbus = vbus_is_present(udc);
1948         if (vbus != udc->vbus_prev) {
1949                 if (vbus) {
1950                         usba_start(udc);
1951                 } else {
1952                         udc->suspended = false;
1953                         if (udc->driver->disconnect)
1954                                 udc->driver->disconnect(&udc->gadget);
1955
1956                         usba_stop(udc);
1957                 }
1958                 udc->vbus_prev = vbus;
1959         }
1960
1961         mutex_unlock(&udc->vbus_mutex);
1962         return IRQ_HANDLED;
1963 }
1964
1965 static int atmel_usba_start(struct usb_gadget *gadget,
1966                 struct usb_gadget_driver *driver)
1967 {
1968         int ret;
1969         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
1970         unsigned long flags;
1971
1972         spin_lock_irqsave(&udc->lock, flags);
1973         udc->devstatus = 1 << USB_DEVICE_SELF_POWERED;
1974         udc->driver = driver;
1975         spin_unlock_irqrestore(&udc->lock, flags);
1976
1977         mutex_lock(&udc->vbus_mutex);
1978
1979         if (udc->vbus_pin)
1980                 enable_irq(gpiod_to_irq(udc->vbus_pin));
1981
1982         /* If Vbus is present, enable the controller and wait for reset */
1983         udc->vbus_prev = vbus_is_present(udc);
1984         if (udc->vbus_prev) {
1985                 ret = usba_start(udc);
1986                 if (ret)
1987                         goto err;
1988         }
1989
1990         mutex_unlock(&udc->vbus_mutex);
1991         return 0;
1992
1993 err:
1994         if (udc->vbus_pin)
1995                 disable_irq(gpiod_to_irq(udc->vbus_pin));
1996
1997         mutex_unlock(&udc->vbus_mutex);
1998
1999         spin_lock_irqsave(&udc->lock, flags);
2000         udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
2001         udc->driver = NULL;
2002         spin_unlock_irqrestore(&udc->lock, flags);
2003         return ret;
2004 }
2005
2006 static int atmel_usba_stop(struct usb_gadget *gadget)
2007 {
2008         struct usba_udc *udc = container_of(gadget, struct usba_udc, gadget);
2009
2010         if (udc->vbus_pin)
2011                 disable_irq(gpiod_to_irq(udc->vbus_pin));
2012
2013         if (fifo_mode == 0)
2014                 udc->configured_ep = 1;
2015
2016         udc->suspended = false;
2017         usba_stop(udc);
2018
2019         udc->driver = NULL;
2020
2021         return 0;
2022 }
2023
2024 static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
2025 {
2026         regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
2027                            is_on ? AT91_PMC_BIASEN : 0);
2028 }
2029
2030 static void at91sam9g45_pulse_bias(struct usba_udc *udc)
2031 {
2032         regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN, 0);
2033         regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
2034                            AT91_PMC_BIASEN);
2035 }
2036
2037 static const struct usba_udc_errata at91sam9rl_errata = {
2038         .toggle_bias = at91sam9rl_toggle_bias,
2039 };
2040
2041 static const struct usba_udc_errata at91sam9g45_errata = {
2042         .pulse_bias = at91sam9g45_pulse_bias,
2043 };
2044
2045 static const struct of_device_id atmel_udc_dt_ids[] = {
2046         { .compatible = "atmel,at91sam9rl-udc", .data = &at91sam9rl_errata },
2047         { .compatible = "atmel,at91sam9g45-udc", .data = &at91sam9g45_errata },
2048         { .compatible = "atmel,sama5d3-udc" },
2049         { /* sentinel */ }
2050 };
2051
2052 MODULE_DEVICE_TABLE(of, atmel_udc_dt_ids);
2053
2054 static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
2055                                                     struct usba_udc *udc)
2056 {
2057         u32 val;
2058         struct device_node *np = pdev->dev.of_node;
2059         const struct of_device_id *match;
2060         struct device_node *pp;
2061         int i, ret;
2062         struct usba_ep *eps, *ep;
2063
2064         match = of_match_node(atmel_udc_dt_ids, np);
2065         if (!match)
2066                 return ERR_PTR(-EINVAL);
2067
2068         udc->errata = match->data;
2069         udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9g45-pmc");
2070         if (IS_ERR(udc->pmc))
2071                 udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9rl-pmc");
2072         if (IS_ERR(udc->pmc))
2073                 udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9x5-pmc");
2074         if (udc->errata && IS_ERR(udc->pmc))
2075                 return ERR_CAST(udc->pmc);
2076
2077         udc->num_ep = 0;
2078
2079         udc->vbus_pin = devm_gpiod_get_optional(&pdev->dev, "atmel,vbus",
2080                                                 GPIOD_IN);
2081
2082         if (fifo_mode == 0) {
2083                 pp = NULL;
2084                 while ((pp = of_get_next_child(np, pp)))
2085                         udc->num_ep++;
2086                 udc->configured_ep = 1;
2087         } else {
2088                 udc->num_ep = usba_config_fifo_table(udc);
2089         }
2090
2091         eps = devm_kcalloc(&pdev->dev, udc->num_ep, sizeof(struct usba_ep),
2092                            GFP_KERNEL);
2093         if (!eps)
2094                 return ERR_PTR(-ENOMEM);
2095
2096         udc->gadget.ep0 = &eps[0].ep;
2097
2098         INIT_LIST_HEAD(&eps[0].ep.ep_list);
2099
2100         pp = NULL;
2101         i = 0;
2102         while ((pp = of_get_next_child(np, pp)) && i < udc->num_ep) {
2103                 ep = &eps[i];
2104
2105                 ret = of_property_read_u32(pp, "reg", &val);
2106                 if (ret) {
2107                         dev_err(&pdev->dev, "of_probe: reg error(%d)\n", ret);
2108                         goto err;
2109                 }
2110                 ep->index = fifo_mode ? udc->fifo_cfg[i].hw_ep_num : val;
2111
2112                 ret = of_property_read_u32(pp, "atmel,fifo-size", &val);
2113                 if (ret) {
2114                         dev_err(&pdev->dev, "of_probe: fifo-size error(%d)\n", ret);
2115                         goto err;
2116                 }
2117                 if (fifo_mode) {
2118                         if (val < udc->fifo_cfg[i].fifo_size) {
2119                                 dev_warn(&pdev->dev,
2120                                          "Using max fifo-size value from DT\n");
2121                                 ep->fifo_size = val;
2122                         } else {
2123                                 ep->fifo_size = udc->fifo_cfg[i].fifo_size;
2124                         }
2125                 } else {
2126                         ep->fifo_size = val;
2127                 }
2128
2129                 ret = of_property_read_u32(pp, "atmel,nb-banks", &val);
2130                 if (ret) {
2131                         dev_err(&pdev->dev, "of_probe: nb-banks error(%d)\n", ret);
2132                         goto err;
2133                 }
2134                 if (fifo_mode) {
2135                         if (val < udc->fifo_cfg[i].nr_banks) {
2136                                 dev_warn(&pdev->dev,
2137                                          "Using max nb-banks value from DT\n");
2138                                 ep->nr_banks = val;
2139                         } else {
2140                                 ep->nr_banks = udc->fifo_cfg[i].nr_banks;
2141                         }
2142                 } else {
2143                         ep->nr_banks = val;
2144                 }
2145
2146                 ep->can_dma = of_property_read_bool(pp, "atmel,can-dma");
2147                 ep->can_isoc = of_property_read_bool(pp, "atmel,can-isoc");
2148
2149                 sprintf(ep->name, "ep%d", ep->index);
2150                 ep->ep.name = ep->name;
2151
2152                 ep->ep_regs = udc->regs + USBA_EPT_BASE(i);
2153                 ep->dma_regs = udc->regs + USBA_DMA_BASE(i);
2154                 ep->fifo = udc->fifo + USBA_FIFO_BASE(i);
2155                 ep->ep.ops = &usba_ep_ops;
2156                 usb_ep_set_maxpacket_limit(&ep->ep, ep->fifo_size);
2157                 ep->udc = udc;
2158                 INIT_LIST_HEAD(&ep->queue);
2159
2160                 if (ep->index == 0) {
2161                         ep->ep.caps.type_control = true;
2162                 } else {
2163                         ep->ep.caps.type_iso = ep->can_isoc;
2164                         ep->ep.caps.type_bulk = true;
2165                         ep->ep.caps.type_int = true;
2166                 }
2167
2168                 ep->ep.caps.dir_in = true;
2169                 ep->ep.caps.dir_out = true;
2170
2171                 if (fifo_mode != 0) {
2172                         /*
2173                          * Generate ept_cfg based on FIFO size and
2174                          * banks number
2175                          */
2176                         if (ep->fifo_size  <= 8)
2177                                 ep->ept_cfg = USBA_BF(EPT_SIZE, USBA_EPT_SIZE_8);
2178                         else
2179                                 /* LSB is bit 1, not 0 */
2180                                 ep->ept_cfg =
2181                                   USBA_BF(EPT_SIZE, fls(ep->fifo_size - 1) - 3);
2182
2183                         ep->ept_cfg |= USBA_BF(BK_NUMBER, ep->nr_banks);
2184                 }
2185
2186                 if (i)
2187                         list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
2188
2189                 i++;
2190         }
2191
2192         if (i == 0) {
2193                 dev_err(&pdev->dev, "of_probe: no endpoint specified\n");
2194                 ret = -EINVAL;
2195                 goto err;
2196         }
2197
2198         return eps;
2199 err:
2200         return ERR_PTR(ret);
2201 }
2202
2203 static int usba_udc_probe(struct platform_device *pdev)
2204 {
2205         struct resource *res;
2206         struct clk *pclk, *hclk;
2207         struct usba_udc *udc;
2208         int irq, ret, i;
2209
2210         udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
2211         if (!udc)
2212                 return -ENOMEM;
2213
2214         udc->gadget = usba_gadget_template;
2215         INIT_LIST_HEAD(&udc->gadget.ep_list);
2216
2217         res = platform_get_resource(pdev, IORESOURCE_MEM, CTRL_IOMEM_ID);
2218         udc->regs = devm_ioremap_resource(&pdev->dev, res);
2219         if (IS_ERR(udc->regs))
2220                 return PTR_ERR(udc->regs);
2221         dev_info(&pdev->dev, "MMIO registers at %pR mapped at %p\n",
2222                  res, udc->regs);
2223
2224         res = platform_get_resource(pdev, IORESOURCE_MEM, FIFO_IOMEM_ID);
2225         udc->fifo = devm_ioremap_resource(&pdev->dev, res);
2226         if (IS_ERR(udc->fifo))
2227                 return PTR_ERR(udc->fifo);
2228         dev_info(&pdev->dev, "FIFO at %pR mapped at %p\n", res, udc->fifo);
2229
2230         irq = platform_get_irq(pdev, 0);
2231         if (irq < 0)
2232                 return irq;
2233
2234         pclk = devm_clk_get(&pdev->dev, "pclk");
2235         if (IS_ERR(pclk))
2236                 return PTR_ERR(pclk);
2237         hclk = devm_clk_get(&pdev->dev, "hclk");
2238         if (IS_ERR(hclk))
2239                 return PTR_ERR(hclk);
2240
2241         spin_lock_init(&udc->lock);
2242         mutex_init(&udc->vbus_mutex);
2243         udc->pdev = pdev;
2244         udc->pclk = pclk;
2245         udc->hclk = hclk;
2246
2247         platform_set_drvdata(pdev, udc);
2248
2249         /* Make sure we start from a clean slate */
2250         ret = clk_prepare_enable(pclk);
2251         if (ret) {
2252                 dev_err(&pdev->dev, "Unable to enable pclk, aborting.\n");
2253                 return ret;
2254         }
2255
2256         usba_writel(udc, CTRL, USBA_DISABLE_MASK);
2257         clk_disable_unprepare(pclk);
2258
2259         udc->usba_ep = atmel_udc_of_init(pdev, udc);
2260
2261         toggle_bias(udc, 0);
2262
2263         if (IS_ERR(udc->usba_ep))
2264                 return PTR_ERR(udc->usba_ep);
2265
2266         ret = devm_request_irq(&pdev->dev, irq, usba_udc_irq, 0,
2267                                 "atmel_usba_udc", udc);
2268         if (ret) {
2269                 dev_err(&pdev->dev, "Cannot request irq %d (error %d)\n",
2270                         irq, ret);
2271                 return ret;
2272         }
2273         udc->irq = irq;
2274
2275         if (udc->vbus_pin) {
2276                 irq_set_status_flags(gpiod_to_irq(udc->vbus_pin), IRQ_NOAUTOEN);
2277                 ret = devm_request_threaded_irq(&pdev->dev,
2278                                 gpiod_to_irq(udc->vbus_pin), NULL,
2279                                 usba_vbus_irq_thread, USBA_VBUS_IRQFLAGS,
2280                                 "atmel_usba_udc", udc);
2281                 if (ret) {
2282                         udc->vbus_pin = NULL;
2283                         dev_warn(&udc->pdev->dev,
2284                                  "failed to request vbus irq; "
2285                                  "assuming always on\n");
2286                 }
2287         }
2288
2289         ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
2290         if (ret)
2291                 return ret;
2292         device_init_wakeup(&pdev->dev, 1);
2293
2294         usba_init_debugfs(udc);
2295         for (i = 1; i < udc->num_ep; i++)
2296                 usba_ep_init_debugfs(udc, &udc->usba_ep[i]);
2297
2298         return 0;
2299 }
2300
2301 static int usba_udc_remove(struct platform_device *pdev)
2302 {
2303         struct usba_udc *udc;
2304         int i;
2305
2306         udc = platform_get_drvdata(pdev);
2307
2308         device_init_wakeup(&pdev->dev, 0);
2309         usb_del_gadget_udc(&udc->gadget);
2310
2311         for (i = 1; i < udc->num_ep; i++)
2312                 usba_ep_cleanup_debugfs(&udc->usba_ep[i]);
2313         usba_cleanup_debugfs(udc);
2314
2315         return 0;
2316 }
2317
2318 #ifdef CONFIG_PM_SLEEP
2319 static int usba_udc_suspend(struct device *dev)
2320 {
2321         struct usba_udc *udc = dev_get_drvdata(dev);
2322
2323         /* Not started */
2324         if (!udc->driver)
2325                 return 0;
2326
2327         mutex_lock(&udc->vbus_mutex);
2328
2329         if (!device_may_wakeup(dev)) {
2330                 udc->suspended = false;
2331                 usba_stop(udc);
2332                 goto out;
2333         }
2334
2335         /*
2336          * Device may wake up. We stay clocked if we failed
2337          * to request vbus irq, assuming always on.
2338          */
2339         if (udc->vbus_pin) {
2340                 /* FIXME: right to stop here...??? */
2341                 usba_stop(udc);
2342                 enable_irq_wake(gpiod_to_irq(udc->vbus_pin));
2343         }
2344
2345         enable_irq_wake(udc->irq);
2346
2347 out:
2348         mutex_unlock(&udc->vbus_mutex);
2349         return 0;
2350 }
2351
2352 static int usba_udc_resume(struct device *dev)
2353 {
2354         struct usba_udc *udc = dev_get_drvdata(dev);
2355
2356         /* Not started */
2357         if (!udc->driver)
2358                 return 0;
2359
2360         if (device_may_wakeup(dev)) {
2361                 if (udc->vbus_pin)
2362                         disable_irq_wake(gpiod_to_irq(udc->vbus_pin));
2363
2364                 disable_irq_wake(udc->irq);
2365         }
2366
2367         /* If Vbus is present, enable the controller and wait for reset */
2368         mutex_lock(&udc->vbus_mutex);
2369         udc->vbus_prev = vbus_is_present(udc);
2370         if (udc->vbus_prev)
2371                 usba_start(udc);
2372         mutex_unlock(&udc->vbus_mutex);
2373
2374         return 0;
2375 }
2376 #endif
2377
2378 static SIMPLE_DEV_PM_OPS(usba_udc_pm_ops, usba_udc_suspend, usba_udc_resume);
2379
2380 static struct platform_driver udc_driver = {
2381         .remove         = usba_udc_remove,
2382         .driver         = {
2383                 .name           = "atmel_usba_udc",
2384                 .pm             = &usba_udc_pm_ops,
2385                 .of_match_table = atmel_udc_dt_ids,
2386         },
2387 };
2388
2389 module_platform_driver_probe(udc_driver, usba_udc_probe);
2390
2391 MODULE_DESCRIPTION("Atmel USBA UDC driver");
2392 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2393 MODULE_LICENSE("GPL");
2394 MODULE_ALIAS("platform:atmel_usba_udc");