drivers/usb/renesas_usbhs/mod_gadget.c

   1 /*
   2  * Renesas USB driver
   3  *
   4  * Copyright (C) 2011 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  15  *
  16  */
  17 #include <linux/delay.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/io.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/usb/ch9.h>
  23 #include <linux/usb/gadget.h>
  24 #include "common.h"
  25
  26 /*
  27  *              struct
  28  */
  29 struct usbhsg_request {
  30         struct usb_request      req;
  31         struct usbhs_pkt        pkt;
  32 };
  33
  34 #define EP_NAME_SIZE 8
  35 struct usbhsg_gpriv;
  36 struct usbhsg_uep {
  37         struct usb_ep            ep;
  38         struct usbhs_pipe       *pipe;
  39
  40         char ep_name[EP_NAME_SIZE];
  41
  42         struct usbhsg_gpriv *gpriv;
  43 };
  44
  45 struct usbhsg_gpriv {
  46         struct usb_gadget        gadget;
  47         struct usbhs_mod         mod;
  48
  49         struct usbhsg_uep       *uep;
  50         int                      uep_size;
  51
  52         struct usb_gadget_driver        *driver;
  53
  54         u32     status;
  55 #define USBHSG_STATUS_STARTED           (1 << 0)
  56 #define USBHSG_STATUS_REGISTERD         (1 << 1)
  57 #define USBHSG_STATUS_WEDGE             (1 << 2)
  58 };
  59
  60 struct usbhsg_recip_handle {
  61         char *name;
  62         int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  63                       struct usb_ctrlrequest *ctrl);
  64         int (*interface)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  65                          struct usb_ctrlrequest *ctrl);
  66         int (*endpoint)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  67                         struct usb_ctrlrequest *ctrl);
  68 };
  69
  70 /*
  71  *              macro
  72  */
  73 #define usbhsg_priv_to_gpriv(priv)                      \
  74         container_of(                                   \
  75                 usbhs_mod_get(priv, USBHS_GADGET),      \
  76                 struct usbhsg_gpriv, mod)
  77
  78 #define __usbhsg_for_each_uep(start, pos, g, i) \
  79         for (i = start, pos = (g)->uep + i;     \
  80              i < (g)->uep_size;                 \
  81              i++, pos = (g)->uep + i)
  82
  83 #define usbhsg_for_each_uep(pos, gpriv, i)      \
  84         __usbhsg_for_each_uep(1, pos, gpriv, i)
  85
  86 #define usbhsg_for_each_uep_with_dcp(pos, gpriv, i)     \
  87         __usbhsg_for_each_uep(0, pos, gpriv, i)
  88
  89 #define usbhsg_gadget_to_gpriv(g)\
  90         container_of(g, struct usbhsg_gpriv, gadget)
  91
  92 #define usbhsg_req_to_ureq(r)\
  93         container_of(r, struct usbhsg_request, req)
  94
  95 #define usbhsg_ep_to_uep(e)             container_of(e, struct usbhsg_uep, ep)
  96 #define usbhsg_gpriv_to_dev(gp)         usbhs_priv_to_dev((gp)->mod.priv)
  97 #define usbhsg_gpriv_to_priv(gp)        ((gp)->mod.priv)
  98 #define usbhsg_gpriv_to_dcp(gp)         ((gp)->uep)
  99 #define usbhsg_gpriv_to_nth_uep(gp, i)  ((gp)->uep + i)
 100 #define usbhsg_uep_to_gpriv(u)          ((u)->gpriv)
 101 #define usbhsg_uep_to_pipe(u)           ((u)->pipe)
 102 #define usbhsg_pipe_to_uep(p)           ((p)->mod_private)
 103 #define usbhsg_is_dcp(u)                ((u) == usbhsg_gpriv_to_dcp((u)->gpriv))
 104
 105 #define usbhsg_ureq_to_pkt(u)           (&(u)->pkt)
 106 #define usbhsg_pkt_to_ureq(i)   \
 107         container_of(i, struct usbhsg_request, pkt)
 108
 109 #define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN)
 110
 111 /* status */
 112 #define usbhsg_status_init(gp)   do {(gp)->status = 0; } while (0)
 113 #define usbhsg_status_set(gp, b) (gp->status |=  b)
 114 #define usbhsg_status_clr(gp, b) (gp->status &= ~b)
 115 #define usbhsg_status_has(gp, b) (gp->status &   b)
 116
 117 /*
 118  *              queue push/pop
 119  */
 120 static void usbhsg_queue_pop(struct usbhsg_uep *uep,
 121                              struct usbhsg_request *ureq,
 122                              int status)
 123 {
 124         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 125         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 126         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 127
 128         dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
 129
 130         ureq->req.status = status;
 131         ureq->req.complete(&uep->ep, &ureq->req);
 132 }
 133
 134 static void usbhsg_queue_done(struct usbhs_priv *priv, struct usbhs_pkt *pkt)
 135 {
 136         struct usbhs_pipe *pipe = pkt->pipe;
 137         struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
 138         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 139
 140         ureq->req.actual = pkt->actual;
 141
 142         usbhsg_queue_pop(uep, ureq, 0);
 143 }
 144
 145 static void usbhsg_queue_push(struct usbhsg_uep *uep,
 146                               struct usbhsg_request *ureq)
 147 {
 148         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 149         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 150         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 151         struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
 152         struct usb_request *req = &ureq->req;
 153
 154         req->actual = 0;
 155         req->status = -EINPROGRESS;
 156         usbhs_pkt_push(pipe, pkt, usbhsg_queue_done,
 157                        req->buf, req->length, req->zero, -1);
 158         usbhs_pkt_start(pipe);
 159
 160         dev_dbg(dev, "pipe %d : queue push (%d)\n",
 161                 usbhs_pipe_number(pipe),
 162                 req->length);
 163 }
 164
 165 /*
 166  *              dma map/unmap
 167  */
 168 static int usbhsg_dma_map(struct device *dev,
 169                           struct usbhs_pkt *pkt,
 170                           enum dma_data_direction dir)
 171 {
 172         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 173         struct usb_request *req = &ureq->req;
 174
 175         if (pkt->dma != DMA_ADDR_INVALID) {
 176                 dev_err(dev, "dma is already mapped\n");
 177                 return -EIO;
 178         }
 179
 180         if (req->dma == DMA_ADDR_INVALID) {
 181                 pkt->dma = dma_map_single(dev, pkt->buf, pkt->length, dir);
 182         } else {
 183                 dma_sync_single_for_device(dev, req->dma, req->length, dir);
 184                 pkt->dma = req->dma;
 185         }
 186
 187         if (dma_mapping_error(dev, pkt->dma)) {
 188                 dev_err(dev, "dma mapping error %llx\n", (u64)pkt->dma);
 189                 return -EIO;
 190         }
 191
 192         return 0;
 193 }
 194
 195 static int usbhsg_dma_unmap(struct device *dev,
 196                             struct usbhs_pkt *pkt,
 197                             enum dma_data_direction dir)
 198 {
 199         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 200         struct usb_request *req = &ureq->req;
 201
 202         if (pkt->dma == DMA_ADDR_INVALID) {
 203                 dev_err(dev, "dma is not mapped\n");
 204                 return -EIO;
 205         }
 206
 207         if (req->dma == DMA_ADDR_INVALID)
 208                 dma_unmap_single(dev, pkt->dma, pkt->length, dir);
 209         else
 210                 dma_sync_single_for_cpu(dev, req->dma, req->length, dir);
 211
 212         pkt->dma = DMA_ADDR_INVALID;
 213
 214         return 0;
 215 }
 216
 217 static int usbhsg_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 218 {
 219         struct usbhs_pipe *pipe = pkt->pipe;
 220         struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
 221         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 222         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 223         enum dma_data_direction dir;
 224
 225         dir = usbhs_pipe_is_dir_in(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 226
 227         if (map)
 228                 return usbhsg_dma_map(dev, pkt, dir);
 229         else
 230                 return usbhsg_dma_unmap(dev, pkt, dir);
 231 }
 232
 233 /*
 234  *              USB_TYPE_STANDARD / clear feature functions
 235  */
 236 static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
 237                                                  struct usbhsg_uep *uep,
 238                                                  struct usb_ctrlrequest *ctrl)
 239 {
 240         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 241         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 242         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 243
 244         usbhs_dcp_control_transfer_done(pipe);
 245
 246         return 0;
 247 }
 248
 249 static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
 250                                                    struct usbhsg_uep *uep,
 251                                                    struct usb_ctrlrequest *ctrl)
 252 {
 253         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 254         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 255
 256         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
 257                 usbhs_pipe_disable(pipe);
 258                 usbhs_pipe_sequence_data0(pipe);
 259                 usbhs_pipe_enable(pipe);
 260         }
 261
 262         usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 263
 264         usbhs_pkt_start(pipe);
 265
 266         return 0;
 267 }
 268
 269 struct usbhsg_recip_handle req_clear_feature = {
 270         .name           = "clear feature",
 271         .device         = usbhsg_recip_handler_std_control_done,
 272         .interface      = usbhsg_recip_handler_std_control_done,
 273         .endpoint       = usbhsg_recip_handler_std_clear_endpoint,
 274 };
 275
 276 /*
 277  *              USB_TYPE_STANDARD / set feature functions
 278  */
 279 static int usbhsg_recip_handler_std_set_device(struct usbhs_priv *priv,
 280                                                  struct usbhsg_uep *uep,
 281                                                  struct usb_ctrlrequest *ctrl)
 282 {
 283         switch (le16_to_cpu(ctrl->wValue)) {
 284         case USB_DEVICE_TEST_MODE:
 285                 usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 286                 udelay(100);
 287                 usbhs_sys_set_test_mode(priv, le16_to_cpu(ctrl->wIndex >> 8));
 288                 break;
 289         default:
 290                 usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 291                 break;
 292         }
 293
 294         return 0;
 295 }
 296
 297 static int usbhsg_recip_handler_std_set_endpoint(struct usbhs_priv *priv,
 298                                                  struct usbhsg_uep *uep,
 299                                                  struct usb_ctrlrequest *ctrl)
 300 {
 301         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 302
 303         usbhs_pipe_stall(pipe);
 304
 305         usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 306
 307         return 0;
 308 }
 309
 310 struct usbhsg_recip_handle req_set_feature = {
 311         .name           = "set feature",
 312         .device         = usbhsg_recip_handler_std_set_device,
 313         .interface      = usbhsg_recip_handler_std_control_done,
 314         .endpoint       = usbhsg_recip_handler_std_set_endpoint,
 315 };
 316
 317 /*
 318  *              USB_TYPE_STANDARD / get status functions
 319  */
 320 static void __usbhsg_recip_send_complete(struct usb_ep *ep,
 321                                          struct usb_request *req)
 322 {
 323         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 324
 325         /* free allocated recip-buffer/usb_request */
 326         kfree(ureq->pkt.buf);
 327         usb_ep_free_request(ep, req);
 328 }
 329
 330 static void __usbhsg_recip_send_status(struct usbhsg_gpriv *gpriv,
 331                                        unsigned short status)
 332 {
 333         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 334         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 335         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 336         struct usb_request *req;
 337         unsigned short *buf;
 338
 339         /* alloc new usb_request for recip */
 340         req = usb_ep_alloc_request(&dcp->ep, GFP_ATOMIC);
 341         if (!req) {
 342                 dev_err(dev, "recip request allocation fail\n");
 343                 return;
 344         }
 345
 346         /* alloc recip data buffer */
 347         buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
 348         if (!buf) {
 349                 usb_ep_free_request(&dcp->ep, req);
 350                 dev_err(dev, "recip data allocation fail\n");
 351                 return;
 352         }
 353
 354         /* recip data is status */
 355         *buf = cpu_to_le16(status);
 356
 357         /* allocated usb_request/buffer will be freed */
 358         req->complete   = __usbhsg_recip_send_complete;
 359         req->buf        = buf;
 360         req->length     = sizeof(*buf);
 361         req->zero       = 0;
 362
 363         /* push packet */
 364         pipe->handler = &usbhs_fifo_pio_push_handler;
 365         usbhsg_queue_push(dcp, usbhsg_req_to_ureq(req));
 366 }
 367
 368 static int usbhsg_recip_handler_std_get_device(struct usbhs_priv *priv,
 369                                                struct usbhsg_uep *uep,
 370                                                struct usb_ctrlrequest *ctrl)
 371 {
 372         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 373         unsigned short status = 1 << USB_DEVICE_SELF_POWERED;
 374
 375         __usbhsg_recip_send_status(gpriv, status);
 376
 377         return 0;
 378 }
 379
 380 static int usbhsg_recip_handler_std_get_interface(struct usbhs_priv *priv,
 381                                                   struct usbhsg_uep *uep,
 382                                                   struct usb_ctrlrequest *ctrl)
 383 {
 384         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 385         unsigned short status = 0;
 386
 387         __usbhsg_recip_send_status(gpriv, status);
 388
 389         return 0;
 390 }
 391
 392 static int usbhsg_recip_handler_std_get_endpoint(struct usbhs_priv *priv,
 393                                                  struct usbhsg_uep *uep,
 394                                                  struct usb_ctrlrequest *ctrl)
 395 {
 396         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 397         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 398         unsigned short status = 0;
 399
 400         if (usbhs_pipe_is_stall(pipe))
 401                 status = 1 << USB_ENDPOINT_HALT;
 402
 403         __usbhsg_recip_send_status(gpriv, status);
 404
 405         return 0;
 406 }
 407
 408 struct usbhsg_recip_handle req_get_status = {
 409         .name           = "get status",
 410         .device         = usbhsg_recip_handler_std_get_device,
 411         .interface      = usbhsg_recip_handler_std_get_interface,
 412         .endpoint       = usbhsg_recip_handler_std_get_endpoint,
 413 };
 414
 415 /*
 416  *              USB_TYPE handler
 417  */
 418 static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 419                                    struct usbhsg_recip_handle *handler,
 420                                    struct usb_ctrlrequest *ctrl)
 421 {
 422         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 423         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 424         struct usbhsg_uep *uep;
 425         struct usbhs_pipe *pipe;
 426         int recip = ctrl->bRequestType & USB_RECIP_MASK;
 427         int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 428         int ret;
 429         int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
 430                     struct usb_ctrlrequest *ctrl);
 431         char *msg;
 432
 433         uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
 434         pipe = usbhsg_uep_to_pipe(uep);
 435         if (!pipe) {
 436                 dev_err(dev, "wrong recip request\n");
 437                 return -EINVAL;
 438         }
 439
 440         switch (recip) {
 441         case USB_RECIP_DEVICE:
 442                 msg     = "DEVICE";
 443                 func    = handler->device;
 444                 break;
 445         case USB_RECIP_INTERFACE:
 446                 msg     = "INTERFACE";
 447                 func    = handler->interface;
 448                 break;
 449         case USB_RECIP_ENDPOINT:
 450                 msg     = "ENDPOINT";
 451                 func    = handler->endpoint;
 452                 break;
 453         default:
 454                 dev_warn(dev, "unsupported RECIP(%d)\n", recip);
 455                 func = NULL;
 456                 ret = -EINVAL;
 457         }
 458
 459         if (func) {
 460                 dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
 461                 ret = func(priv, uep, ctrl);
 462         }
 463
 464         return ret;
 465 }
 466
 467 /*
 468  *              irq functions
 469  *
 470  * it will be called from usbhs_interrupt
 471  */
 472 static int usbhsg_irq_dev_state(struct usbhs_priv *priv,
 473                                 struct usbhs_irq_state *irq_state)
 474 {
 475         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 476         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 477
 478         gpriv->gadget.speed = usbhs_bus_get_speed(priv);
 479
 480         dev_dbg(dev, "state = %x : speed : %d\n",
 481                 usbhs_status_get_device_state(irq_state),
 482                 gpriv->gadget.speed);
 483
 484         return 0;
 485 }
 486
 487 static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
 488                                  struct usbhs_irq_state *irq_state)
 489 {
 490         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 491         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 492         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 493         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 494         struct usb_ctrlrequest ctrl;
 495         struct usbhsg_recip_handle *recip_handler = NULL;
 496         int stage = usbhs_status_get_ctrl_stage(irq_state);
 497         int ret = 0;
 498
 499         dev_dbg(dev, "stage = %d\n", stage);
 500
 501         /*
 502          * see Manual
 503          *
 504          *  "Operation"
 505          *  - "Interrupt Function"
 506          *    - "Control Transfer Stage Transition Interrupt"
 507          *      - Fig. "Control Transfer Stage Transitions"
 508          */
 509
 510         switch (stage) {
 511         case READ_DATA_STAGE:
 512                 pipe->handler = &usbhs_fifo_pio_push_handler;
 513                 break;
 514         case WRITE_DATA_STAGE:
 515                 pipe->handler = &usbhs_fifo_pio_pop_handler;
 516                 break;
 517         case NODATA_STATUS_STAGE:
 518                 pipe->handler = &usbhs_ctrl_stage_end_handler;
 519                 break;
 520         default:
 521                 return ret;
 522         }
 523
 524         /*
 525          * get usb request
 526          */
 527         usbhs_usbreq_get_val(priv, &ctrl);
 528
 529         switch (ctrl.bRequestType & USB_TYPE_MASK) {
 530         case USB_TYPE_STANDARD:
 531                 switch (ctrl.bRequest) {
 532                 case USB_REQ_CLEAR_FEATURE:
 533                         recip_handler = &req_clear_feature;
 534                         break;
 535                 case USB_REQ_SET_FEATURE:
 536                         recip_handler = &req_set_feature;
 537                         break;
 538                 case USB_REQ_GET_STATUS:
 539                         recip_handler = &req_get_status;
 540                         break;
 541                 }
 542         }
 543
 544         /*
 545          * setup stage / run recip
 546          */
 547         if (recip_handler)
 548                 ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
 549         else
 550                 ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
 551
 552         if (ret < 0)
 553                 usbhs_pipe_stall(pipe);
 554
 555         return ret;
 556 }
 557
 558 /*
 559  *
 560  *              usb_dcp_ops
 561  *
 562  */
 563 static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
 564 {
 565         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 566         struct usbhs_pkt *pkt;
 567
 568         while (1) {
 569                 pkt = usbhs_pkt_pop(pipe, NULL);
 570                 if (!pkt)
 571                         break;
 572
 573                 usbhsg_queue_pop(uep, usbhsg_pkt_to_ureq(pkt), -ECONNRESET);
 574         }
 575
 576         usbhs_pipe_disable(pipe);
 577
 578         return 0;
 579 }
 580
 581 static void usbhsg_uep_init(struct usbhsg_gpriv *gpriv)
 582 {
 583         int i;
 584         struct usbhsg_uep *uep;
 585
 586         usbhsg_for_each_uep_with_dcp(uep, gpriv, i)
 587                 uep->pipe = NULL;
 588 }
 589
 590 /*
 591  *
 592  *              usb_ep_ops
 593  *
 594  */
 595 static int usbhsg_ep_enable(struct usb_ep *ep,
 596                          const struct usb_endpoint_descriptor *desc)
 597 {
 598         struct usbhsg_uep *uep   = usbhsg_ep_to_uep(ep);
 599         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 600         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 601         struct usbhs_pipe *pipe;
 602         int ret = -EIO;
 603
 604         /*
 605          * if it already have pipe,
 606          * nothing to do
 607          */
 608         if (uep->pipe) {
 609                 usbhs_pipe_clear(uep->pipe);
 610                 usbhs_pipe_sequence_data0(uep->pipe);
 611                 return 0;
 612         }
 613
 614         pipe = usbhs_pipe_malloc(priv,
 615                                  usb_endpoint_type(desc),
 616                                  usb_endpoint_dir_in(desc));
 617         if (pipe) {
 618                 uep->pipe               = pipe;
 619                 pipe->mod_private       = uep;
 620
 621                 /* set epnum / maxp */
 622                 usbhs_pipe_config_update(pipe, 0,
 623                                          usb_endpoint_num(desc),
 624                                          usb_endpoint_maxp(desc));
 625
 626                 /*
 627                  * usbhs_fifo_dma_push/pop_handler try to
 628                  * use dmaengine if possible.
 629                  * It will use pio handler if impossible.
 630                  */
 631                 if (usb_endpoint_dir_in(desc))
 632                         pipe->handler = &usbhs_fifo_dma_push_handler;
 633                 else
 634                         pipe->handler = &usbhs_fifo_dma_pop_handler;
 635
 636                 ret = 0;
 637         }
 638
 639         return ret;
 640 }
 641
 642 static int usbhsg_ep_disable(struct usb_ep *ep)
 643 {
 644         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 645
 646         return usbhsg_pipe_disable(uep);
 647 }
 648
 649 static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
 650                                                    gfp_t gfp_flags)
 651 {
 652         struct usbhsg_request *ureq;
 653
 654         ureq = kzalloc(sizeof *ureq, gfp_flags);
 655         if (!ureq)
 656                 return NULL;
 657
 658         usbhs_pkt_init(usbhsg_ureq_to_pkt(ureq));
 659
 660         ureq->req.dma = DMA_ADDR_INVALID;
 661
 662         return &ureq->req;
 663 }
 664
 665 static void usbhsg_ep_free_request(struct usb_ep *ep,
 666                                    struct usb_request *req)
 667 {
 668         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 669
 670         WARN_ON(!list_empty(&ureq->pkt.node));
 671         kfree(ureq);
 672 }
 673
 674 static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
 675                           gfp_t gfp_flags)
 676 {
 677         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 678         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 679         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 680         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 681
 682         /* param check */
 683         if (usbhsg_is_not_connected(gpriv)      ||
 684             unlikely(!gpriv->driver)            ||
 685             unlikely(!pipe))
 686                 return -ESHUTDOWN;
 687
 688         usbhsg_queue_push(uep, ureq);
 689
 690         return 0;
 691 }
 692
 693 static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
 694 {
 695         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 696         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 697         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 698
 699         usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
 700         usbhsg_queue_pop(uep, ureq, -ECONNRESET);
 701
 702         return 0;
 703 }
 704
 705 static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
 706 {
 707         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 708         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 709         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 710         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 711         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 712         unsigned long flags;
 713
 714         usbhsg_pipe_disable(uep);
 715
 716         dev_dbg(dev, "set halt %d (pipe %d)\n",
 717                 halt, usbhs_pipe_number(pipe));
 718
 719         /********************  spin lock ********************/
 720         usbhs_lock(priv, flags);
 721
 722         if (halt)
 723                 usbhs_pipe_stall(pipe);
 724         else
 725                 usbhs_pipe_disable(pipe);
 726
 727         if (halt && wedge)
 728                 usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
 729         else
 730                 usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
 731
 732         usbhs_unlock(priv, flags);
 733         /********************  spin unlock ******************/
 734
 735         return 0;
 736 }
 737
 738 static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
 739 {
 740         return __usbhsg_ep_set_halt_wedge(ep, value, 0);
 741 }
 742
 743 static int usbhsg_ep_set_wedge(struct usb_ep *ep)
 744 {
 745         return __usbhsg_ep_set_halt_wedge(ep, 1, 1);
 746 }
 747
 748 static struct usb_ep_ops usbhsg_ep_ops = {
 749         .enable         = usbhsg_ep_enable,
 750         .disable        = usbhsg_ep_disable,
 751
 752         .alloc_request  = usbhsg_ep_alloc_request,
 753         .free_request   = usbhsg_ep_free_request,
 754
 755         .queue          = usbhsg_ep_queue,
 756         .dequeue        = usbhsg_ep_dequeue,
 757
 758         .set_halt       = usbhsg_ep_set_halt,
 759         .set_wedge      = usbhsg_ep_set_wedge,
 760 };
 761
 762 /*
 763  *              usb module start/end
 764  */
 765 static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
 766 {
 767         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 768         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 769         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 770         struct device *dev = usbhs_priv_to_dev(priv);
 771         unsigned long flags;
 772         int ret = 0;
 773
 774         /********************  spin lock ********************/
 775         usbhs_lock(priv, flags);
 776
 777         usbhsg_status_set(gpriv, status);
 778         if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 779               usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
 780                 ret = -1; /* not ready */
 781
 782         usbhs_unlock(priv, flags);
 783         /********************  spin unlock ********************/
 784
 785         if (ret < 0)
 786                 return 0; /* not ready is not error */
 787
 788         /*
 789          * enable interrupt and systems if ready
 790          */
 791         dev_dbg(dev, "start gadget\n");
 792
 793         /*
 794          * pipe initialize and enable DCP
 795          */
 796         usbhs_pipe_init(priv,
 797                         usbhsg_dma_map_ctrl);
 798         usbhs_fifo_init(priv);
 799         usbhsg_uep_init(gpriv);
 800
 801         /* dcp init */
 802         dcp->pipe               = usbhs_dcp_malloc(priv);
 803         dcp->pipe->mod_private  = dcp;
 804         usbhs_pipe_config_update(dcp->pipe, 0, 0, 64);
 805
 806         /*
 807          * system config enble
 808          * - HI speed
 809          * - function
 810          * - usb module
 811          */
 812         usbhs_sys_function_ctrl(priv, 1);
 813
 814         /*
 815          * enable irq callback
 816          */
 817         mod->irq_dev_state      = usbhsg_irq_dev_state;
 818         mod->irq_ctrl_stage     = usbhsg_irq_ctrl_stage;
 819         usbhs_irq_callback_update(priv, mod);
 820
 821         return 0;
 822 }
 823
 824 static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 825 {
 826         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 827         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 828         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 829         struct device *dev = usbhs_priv_to_dev(priv);
 830         unsigned long flags;
 831         int ret = 0;
 832
 833         /********************  spin lock ********************/
 834         usbhs_lock(priv, flags);
 835
 836         usbhsg_status_clr(gpriv, status);
 837         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 838             !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
 839                 ret = -1; /* already done */
 840
 841         usbhs_unlock(priv, flags);
 842         /********************  spin unlock ********************/
 843
 844         if (ret < 0)
 845                 return 0; /* already done is not error */
 846
 847         /*
 848          * disable interrupt and systems if 1st try
 849          */
 850         usbhs_fifo_quit(priv);
 851
 852         /* disable all irq */
 853         mod->irq_dev_state      = NULL;
 854         mod->irq_ctrl_stage     = NULL;
 855         usbhs_irq_callback_update(priv, mod);
 856
 857         gpriv->gadget.speed = USB_SPEED_UNKNOWN;
 858
 859         /* disable sys */
 860         usbhs_sys_set_test_mode(priv, 0);
 861         usbhs_sys_function_ctrl(priv, 0);
 862
 863         usbhsg_pipe_disable(dcp);
 864
 865         dev_dbg(dev, "stop gadget\n");
 866
 867         return 0;
 868 }
 869
 870 /*
 871  *
 872  *              linux usb function
 873  *
 874  */
 875 static int usbhsg_gadget_start(struct usb_gadget *gadget,
 876                 struct usb_gadget_driver *driver)
 877 {
 878         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 879         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 880
 881         if (!driver             ||
 882             !driver->setup      ||
 883             driver->max_speed < USB_SPEED_FULL)
 884                 return -EINVAL;
 885
 886         /* first hook up the driver ... */
 887         gpriv->driver = driver;
 888         gpriv->gadget.dev.driver = &driver->driver;
 889
 890         return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
 891 }
 892
 893 static int usbhsg_gadget_stop(struct usb_gadget *gadget,
 894                 struct usb_gadget_driver *driver)
 895 {
 896         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 897         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 898
 899         if (!driver             ||
 900             !driver->unbind)
 901                 return -EINVAL;
 902
 903         usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
 904         gpriv->gadget.dev.driver = NULL;
 905         gpriv->driver = NULL;
 906
 907         return 0;
 908 }
 909
 910 /*
 911  *              usb gadget ops
 912  */
 913 static int usbhsg_get_frame(struct usb_gadget *gadget)
 914 {
 915         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 916         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 917
 918         return usbhs_frame_get_num(priv);
 919 }
 920
 921 static struct usb_gadget_ops usbhsg_gadget_ops = {
 922         .get_frame              = usbhsg_get_frame,
 923         .udc_start              = usbhsg_gadget_start,
 924         .udc_stop               = usbhsg_gadget_stop,
 925 };
 926
 927 static int usbhsg_start(struct usbhs_priv *priv)
 928 {
 929         return usbhsg_try_start(priv, USBHSG_STATUS_STARTED);
 930 }
 931
 932 static int usbhsg_stop(struct usbhs_priv *priv)
 933 {
 934         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 935
 936         /* cable disconnect */
 937         if (gpriv->driver &&
 938             gpriv->driver->disconnect)
 939                 gpriv->driver->disconnect(&gpriv->gadget);
 940
 941         return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED);
 942 }
 943
 944 int usbhs_mod_gadget_probe(struct usbhs_priv *priv)
 945 {
 946         struct usbhsg_gpriv *gpriv;
 947         struct usbhsg_uep *uep;
 948         struct device *dev = usbhs_priv_to_dev(priv);
 949         int pipe_size = usbhs_get_dparam(priv, pipe_size);
 950         int i;
 951         int ret;
 952
 953         gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
 954         if (!gpriv) {
 955                 dev_err(dev, "Could not allocate gadget priv\n");
 956                 return -ENOMEM;
 957         }
 958
 959         uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
 960         if (!uep) {
 961                 dev_err(dev, "Could not allocate ep\n");
 962                 ret = -ENOMEM;
 963                 goto usbhs_mod_gadget_probe_err_gpriv;
 964         }
 965
 966         /*
 967          * CAUTION
 968          *
 969          * There is no guarantee that it is possible to access usb module here.
 970          * Don't accesses to it.
 971          * The accesse will be enable after "usbhsg_start"
 972          */
 973
 974         /*
 975          * register itself
 976          */
 977         usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET);
 978
 979         /* init gpriv */
 980         gpriv->mod.name         = "gadget";
 981         gpriv->mod.start        = usbhsg_start;
 982         gpriv->mod.stop         = usbhsg_stop;
 983         gpriv->uep              = uep;
 984         gpriv->uep_size         = pipe_size;
 985         usbhsg_status_init(gpriv);
 986
 987         /*
 988          * init gadget
 989          */
 990         dev_set_name(&gpriv->gadget.dev, "gadget");
 991         gpriv->gadget.dev.parent        = dev;
 992         gpriv->gadget.name              = "renesas_usbhs_udc";
 993         gpriv->gadget.ops               = &usbhsg_gadget_ops;
 994         gpriv->gadget.max_speed         = USB_SPEED_HIGH;
 995         ret = device_register(&gpriv->gadget.dev);
 996         if (ret < 0)
 997                 goto err_add_udc;
 998
 999         INIT_LIST_HEAD(&gpriv->gadget.ep_list);
1000
1001         /*
1002          * init usb_ep
1003          */
1004         usbhsg_for_each_uep_with_dcp(uep, gpriv, i) {
1005                 uep->gpriv      = gpriv;
1006                 snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i);
1007
1008                 uep->ep.name            = uep->ep_name;
1009                 uep->ep.ops             = &usbhsg_ep_ops;
1010                 INIT_LIST_HEAD(&uep->ep.ep_list);
1011
1012                 /* init DCP */
1013                 if (usbhsg_is_dcp(uep)) {
1014                         gpriv->gadget.ep0 = &uep->ep;
1015                         uep->ep.maxpacket = 64;
1016                 }
1017                 /* init normal pipe */
1018                 else {
1019                         uep->ep.maxpacket = 512;
1020                         list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
1021                 }
1022         }
1023
1024         ret = usb_add_gadget_udc(dev, &gpriv->gadget);
1025         if (ret)
1026                 goto err_register;
1027
1028
1029         dev_info(dev, "gadget probed\n");
1030
1031         return 0;
1032
1033 err_register:
1034         device_unregister(&gpriv->gadget.dev);
1035 err_add_udc:
1036         kfree(gpriv->uep);
1037
1038 usbhs_mod_gadget_probe_err_gpriv:
1039         kfree(gpriv);
1040
1041         return ret;
1042 }
1043
1044 void usbhs_mod_gadget_remove(struct usbhs_priv *priv)
1045 {
1046         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1047
1048         usb_del_gadget_udc(&gpriv->gadget);
1049
1050         device_unregister(&gpriv->gadget.dev);
1051
1052         kfree(gpriv->uep);
1053         kfree(gpriv);
1054 }