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