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_ctrl(struct usbhs_pkt *pkt, int map)
 169 {
 170         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 171         struct usb_request *req = &ureq->req;
 172         struct usbhs_pipe *pipe = pkt->pipe;
 173         struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
 174         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 175         enum dma_data_direction dir;
 176         int ret = 0;
 177
 178         dir = usbhs_pipe_is_dir_host(pipe);
 179
 180         if (map) {
 181                 /* it can not use scatter/gather */
 182                 WARN_ON(req->num_sgs);
 183
 184                 ret = usb_gadget_map_request(&gpriv->gadget, req, dir);
 185                 if (ret < 0)
 186                         return ret;
 187
 188                 pkt->dma = req->dma;
 189         } else {
 190                 usb_gadget_unmap_request(&gpriv->gadget, req, dir);
 191         }
 192
 193         return ret;
 194 }
 195
 196 /*
 197  *              USB_TYPE_STANDARD / clear feature functions
 198  */
 199 static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
 200                                                  struct usbhsg_uep *uep,
 201                                                  struct usb_ctrlrequest *ctrl)
 202 {
 203         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 204         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 205         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 206
 207         usbhs_dcp_control_transfer_done(pipe);
 208
 209         return 0;
 210 }
 211
 212 static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
 213                                                    struct usbhsg_uep *uep,
 214                                                    struct usb_ctrlrequest *ctrl)
 215 {
 216         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 217         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 218
 219         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
 220                 usbhs_pipe_disable(pipe);
 221                 usbhs_pipe_sequence_data0(pipe);
 222                 usbhs_pipe_enable(pipe);
 223         }
 224
 225         usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 226
 227         usbhs_pkt_start(pipe);
 228
 229         return 0;
 230 }
 231
 232 struct usbhsg_recip_handle req_clear_feature = {
 233         .name           = "clear feature",
 234         .device         = usbhsg_recip_handler_std_control_done,
 235         .interface      = usbhsg_recip_handler_std_control_done,
 236         .endpoint       = usbhsg_recip_handler_std_clear_endpoint,
 237 };
 238
 239 /*
 240  *              USB_TYPE_STANDARD / set feature functions
 241  */
 242 static int usbhsg_recip_handler_std_set_device(struct usbhs_priv *priv,
 243                                                  struct usbhsg_uep *uep,
 244                                                  struct usb_ctrlrequest *ctrl)
 245 {
 246         switch (le16_to_cpu(ctrl->wValue)) {
 247         case USB_DEVICE_TEST_MODE:
 248                 usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 249                 udelay(100);
 250                 usbhs_sys_set_test_mode(priv, le16_to_cpu(ctrl->wIndex >> 8));
 251                 break;
 252         default:
 253                 usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 254                 break;
 255         }
 256
 257         return 0;
 258 }
 259
 260 static int usbhsg_recip_handler_std_set_endpoint(struct usbhs_priv *priv,
 261                                                  struct usbhsg_uep *uep,
 262                                                  struct usb_ctrlrequest *ctrl)
 263 {
 264         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 265
 266         usbhs_pipe_stall(pipe);
 267
 268         usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 269
 270         return 0;
 271 }
 272
 273 struct usbhsg_recip_handle req_set_feature = {
 274         .name           = "set feature",
 275         .device         = usbhsg_recip_handler_std_set_device,
 276         .interface      = usbhsg_recip_handler_std_control_done,
 277         .endpoint       = usbhsg_recip_handler_std_set_endpoint,
 278 };
 279
 280 /*
 281  *              USB_TYPE_STANDARD / get status functions
 282  */
 283 static void __usbhsg_recip_send_complete(struct usb_ep *ep,
 284                                          struct usb_request *req)
 285 {
 286         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 287
 288         /* free allocated recip-buffer/usb_request */
 289         kfree(ureq->pkt.buf);
 290         usb_ep_free_request(ep, req);
 291 }
 292
 293 static void __usbhsg_recip_send_status(struct usbhsg_gpriv *gpriv,
 294                                        unsigned short status)
 295 {
 296         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 297         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 298         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 299         struct usb_request *req;
 300         unsigned short *buf;
 301
 302         /* alloc new usb_request for recip */
 303         req = usb_ep_alloc_request(&dcp->ep, GFP_ATOMIC);
 304         if (!req) {
 305                 dev_err(dev, "recip request allocation fail\n");
 306                 return;
 307         }
 308
 309         /* alloc recip data buffer */
 310         buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
 311         if (!buf) {
 312                 usb_ep_free_request(&dcp->ep, req);
 313                 dev_err(dev, "recip data allocation fail\n");
 314                 return;
 315         }
 316
 317         /* recip data is status */
 318         *buf = cpu_to_le16(status);
 319
 320         /* allocated usb_request/buffer will be freed */
 321         req->complete   = __usbhsg_recip_send_complete;
 322         req->buf        = buf;
 323         req->length     = sizeof(*buf);
 324         req->zero       = 0;
 325
 326         /* push packet */
 327         pipe->handler = &usbhs_fifo_pio_push_handler;
 328         usbhsg_queue_push(dcp, usbhsg_req_to_ureq(req));
 329 }
 330
 331 static int usbhsg_recip_handler_std_get_device(struct usbhs_priv *priv,
 332                                                struct usbhsg_uep *uep,
 333                                                struct usb_ctrlrequest *ctrl)
 334 {
 335         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 336         unsigned short status = 1 << USB_DEVICE_SELF_POWERED;
 337
 338         __usbhsg_recip_send_status(gpriv, status);
 339
 340         return 0;
 341 }
 342
 343 static int usbhsg_recip_handler_std_get_interface(struct usbhs_priv *priv,
 344                                                   struct usbhsg_uep *uep,
 345                                                   struct usb_ctrlrequest *ctrl)
 346 {
 347         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 348         unsigned short status = 0;
 349
 350         __usbhsg_recip_send_status(gpriv, status);
 351
 352         return 0;
 353 }
 354
 355 static int usbhsg_recip_handler_std_get_endpoint(struct usbhs_priv *priv,
 356                                                  struct usbhsg_uep *uep,
 357                                                  struct usb_ctrlrequest *ctrl)
 358 {
 359         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 360         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 361         unsigned short status = 0;
 362
 363         if (usbhs_pipe_is_stall(pipe))
 364                 status = 1 << USB_ENDPOINT_HALT;
 365
 366         __usbhsg_recip_send_status(gpriv, status);
 367
 368         return 0;
 369 }
 370
 371 struct usbhsg_recip_handle req_get_status = {
 372         .name           = "get status",
 373         .device         = usbhsg_recip_handler_std_get_device,
 374         .interface      = usbhsg_recip_handler_std_get_interface,
 375         .endpoint       = usbhsg_recip_handler_std_get_endpoint,
 376 };
 377
 378 /*
 379  *              USB_TYPE handler
 380  */
 381 static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 382                                    struct usbhsg_recip_handle *handler,
 383                                    struct usb_ctrlrequest *ctrl)
 384 {
 385         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 386         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 387         struct usbhsg_uep *uep;
 388         struct usbhs_pipe *pipe;
 389         int recip = ctrl->bRequestType & USB_RECIP_MASK;
 390         int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 391         int ret = 0;
 392         int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
 393                     struct usb_ctrlrequest *ctrl);
 394         char *msg;
 395
 396         uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
 397         pipe = usbhsg_uep_to_pipe(uep);
 398         if (!pipe) {
 399                 dev_err(dev, "wrong recip request\n");
 400                 return -EINVAL;
 401         }
 402
 403         switch (recip) {
 404         case USB_RECIP_DEVICE:
 405                 msg     = "DEVICE";
 406                 func    = handler->device;
 407                 break;
 408         case USB_RECIP_INTERFACE:
 409                 msg     = "INTERFACE";
 410                 func    = handler->interface;
 411                 break;
 412         case USB_RECIP_ENDPOINT:
 413                 msg     = "ENDPOINT";
 414                 func    = handler->endpoint;
 415                 break;
 416         default:
 417                 dev_warn(dev, "unsupported RECIP(%d)\n", recip);
 418                 func = NULL;
 419                 ret = -EINVAL;
 420         }
 421
 422         if (func) {
 423                 dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
 424                 ret = func(priv, uep, ctrl);
 425         }
 426
 427         return ret;
 428 }
 429
 430 /*
 431  *              irq functions
 432  *
 433  * it will be called from usbhs_interrupt
 434  */
 435 static int usbhsg_irq_dev_state(struct usbhs_priv *priv,
 436                                 struct usbhs_irq_state *irq_state)
 437 {
 438         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 439         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 440
 441         gpriv->gadget.speed = usbhs_bus_get_speed(priv);
 442
 443         dev_dbg(dev, "state = %x : speed : %d\n",
 444                 usbhs_status_get_device_state(irq_state),
 445                 gpriv->gadget.speed);
 446
 447         return 0;
 448 }
 449
 450 static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
 451                                  struct usbhs_irq_state *irq_state)
 452 {
 453         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 454         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 455         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 456         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 457         struct usb_ctrlrequest ctrl;
 458         struct usbhsg_recip_handle *recip_handler = NULL;
 459         int stage = usbhs_status_get_ctrl_stage(irq_state);
 460         int ret = 0;
 461
 462         dev_dbg(dev, "stage = %d\n", stage);
 463
 464         /*
 465          * see Manual
 466          *
 467          *  "Operation"
 468          *  - "Interrupt Function"
 469          *    - "Control Transfer Stage Transition Interrupt"
 470          *      - Fig. "Control Transfer Stage Transitions"
 471          */
 472
 473         switch (stage) {
 474         case READ_DATA_STAGE:
 475                 pipe->handler = &usbhs_fifo_pio_push_handler;
 476                 break;
 477         case WRITE_DATA_STAGE:
 478                 pipe->handler = &usbhs_fifo_pio_pop_handler;
 479                 break;
 480         case NODATA_STATUS_STAGE:
 481                 pipe->handler = &usbhs_ctrl_stage_end_handler;
 482                 break;
 483         default:
 484                 return ret;
 485         }
 486
 487         /*
 488          * get usb request
 489          */
 490         usbhs_usbreq_get_val(priv, &ctrl);
 491
 492         switch (ctrl.bRequestType & USB_TYPE_MASK) {
 493         case USB_TYPE_STANDARD:
 494                 switch (ctrl.bRequest) {
 495                 case USB_REQ_CLEAR_FEATURE:
 496                         recip_handler = &req_clear_feature;
 497                         break;
 498                 case USB_REQ_SET_FEATURE:
 499                         recip_handler = &req_set_feature;
 500                         break;
 501                 case USB_REQ_GET_STATUS:
 502                         recip_handler = &req_get_status;
 503                         break;
 504                 }
 505         }
 506
 507         /*
 508          * setup stage / run recip
 509          */
 510         if (recip_handler)
 511                 ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
 512         else
 513                 ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
 514
 515         if (ret < 0)
 516                 usbhs_pipe_stall(pipe);
 517
 518         return ret;
 519 }
 520
 521 /*
 522  *
 523  *              usb_dcp_ops
 524  *
 525  */
 526 static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
 527 {
 528         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 529         struct usbhs_pkt *pkt;
 530
 531         while (1) {
 532                 pkt = usbhs_pkt_pop(pipe, NULL);
 533                 if (!pkt)
 534                         break;
 535
 536                 usbhsg_queue_pop(uep, usbhsg_pkt_to_ureq(pkt), -ECONNRESET);
 537         }
 538
 539         usbhs_pipe_disable(pipe);
 540
 541         return 0;
 542 }
 543
 544 static void usbhsg_uep_init(struct usbhsg_gpriv *gpriv)
 545 {
 546         int i;
 547         struct usbhsg_uep *uep;
 548
 549         usbhsg_for_each_uep_with_dcp(uep, gpriv, i)
 550                 uep->pipe = NULL;
 551 }
 552
 553 /*
 554  *
 555  *              usb_ep_ops
 556  *
 557  */
 558 static int usbhsg_ep_enable(struct usb_ep *ep,
 559                          const struct usb_endpoint_descriptor *desc)
 560 {
 561         struct usbhsg_uep *uep   = usbhsg_ep_to_uep(ep);
 562         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 563         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 564         struct usbhs_pipe *pipe;
 565         int ret = -EIO;
 566
 567         /*
 568          * if it already have pipe,
 569          * nothing to do
 570          */
 571         if (uep->pipe) {
 572                 usbhs_pipe_clear(uep->pipe);
 573                 usbhs_pipe_sequence_data0(uep->pipe);
 574                 return 0;
 575         }
 576
 577         pipe = usbhs_pipe_malloc(priv,
 578                                  usb_endpoint_type(desc),
 579                                  usb_endpoint_dir_in(desc));
 580         if (pipe) {
 581                 uep->pipe               = pipe;
 582                 pipe->mod_private       = uep;
 583
 584                 /* set epnum / maxp */
 585                 usbhs_pipe_config_update(pipe, 0,
 586                                          usb_endpoint_num(desc),
 587                                          usb_endpoint_maxp(desc));
 588
 589                 /*
 590                  * usbhs_fifo_dma_push/pop_handler try to
 591                  * use dmaengine if possible.
 592                  * It will use pio handler if impossible.
 593                  */
 594                 if (usb_endpoint_dir_in(desc))
 595                         pipe->handler = &usbhs_fifo_dma_push_handler;
 596                 else
 597                         pipe->handler = &usbhs_fifo_dma_pop_handler;
 598
 599                 ret = 0;
 600         }
 601
 602         return ret;
 603 }
 604
 605 static int usbhsg_ep_disable(struct usb_ep *ep)
 606 {
 607         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 608
 609         return usbhsg_pipe_disable(uep);
 610 }
 611
 612 static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
 613                                                    gfp_t gfp_flags)
 614 {
 615         struct usbhsg_request *ureq;
 616
 617         ureq = kzalloc(sizeof *ureq, gfp_flags);
 618         if (!ureq)
 619                 return NULL;
 620
 621         usbhs_pkt_init(usbhsg_ureq_to_pkt(ureq));
 622
 623         return &ureq->req;
 624 }
 625
 626 static void usbhsg_ep_free_request(struct usb_ep *ep,
 627                                    struct usb_request *req)
 628 {
 629         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 630
 631         WARN_ON(!list_empty(&ureq->pkt.node));
 632         kfree(ureq);
 633 }
 634
 635 static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
 636                           gfp_t gfp_flags)
 637 {
 638         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 639         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 640         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 641         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 642
 643         /* param check */
 644         if (usbhsg_is_not_connected(gpriv)      ||
 645             unlikely(!gpriv->driver)            ||
 646             unlikely(!pipe))
 647                 return -ESHUTDOWN;
 648
 649         usbhsg_queue_push(uep, ureq);
 650
 651         return 0;
 652 }
 653
 654 static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
 655 {
 656         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 657         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 658         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 659
 660         usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
 661         usbhsg_queue_pop(uep, ureq, -ECONNRESET);
 662
 663         return 0;
 664 }
 665
 666 static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
 667 {
 668         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 669         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 670         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 671         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 672         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 673         unsigned long flags;
 674
 675         usbhsg_pipe_disable(uep);
 676
 677         dev_dbg(dev, "set halt %d (pipe %d)\n",
 678                 halt, usbhs_pipe_number(pipe));
 679
 680         /********************  spin lock ********************/
 681         usbhs_lock(priv, flags);
 682
 683         if (halt)
 684                 usbhs_pipe_stall(pipe);
 685         else
 686                 usbhs_pipe_disable(pipe);
 687
 688         if (halt && wedge)
 689                 usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
 690         else
 691                 usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
 692
 693         usbhs_unlock(priv, flags);
 694         /********************  spin unlock ******************/
 695
 696         return 0;
 697 }
 698
 699 static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
 700 {
 701         return __usbhsg_ep_set_halt_wedge(ep, value, 0);
 702 }
 703
 704 static int usbhsg_ep_set_wedge(struct usb_ep *ep)
 705 {
 706         return __usbhsg_ep_set_halt_wedge(ep, 1, 1);
 707 }
 708
 709 static struct usb_ep_ops usbhsg_ep_ops = {
 710         .enable         = usbhsg_ep_enable,
 711         .disable        = usbhsg_ep_disable,
 712
 713         .alloc_request  = usbhsg_ep_alloc_request,
 714         .free_request   = usbhsg_ep_free_request,
 715
 716         .queue          = usbhsg_ep_queue,
 717         .dequeue        = usbhsg_ep_dequeue,
 718
 719         .set_halt       = usbhsg_ep_set_halt,
 720         .set_wedge      = usbhsg_ep_set_wedge,
 721 };
 722
 723 /*
 724  *              usb module start/end
 725  */
 726 static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
 727 {
 728         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 729         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 730         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 731         struct device *dev = usbhs_priv_to_dev(priv);
 732         unsigned long flags;
 733         int ret = 0;
 734
 735         /********************  spin lock ********************/
 736         usbhs_lock(priv, flags);
 737
 738         usbhsg_status_set(gpriv, status);
 739         if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 740               usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
 741                 ret = -1; /* not ready */
 742
 743         usbhs_unlock(priv, flags);
 744         /********************  spin unlock ********************/
 745
 746         if (ret < 0)
 747                 return 0; /* not ready is not error */
 748
 749         /*
 750          * enable interrupt and systems if ready
 751          */
 752         dev_dbg(dev, "start gadget\n");
 753
 754         /*
 755          * pipe initialize and enable DCP
 756          */
 757         usbhs_pipe_init(priv,
 758                         usbhsg_dma_map_ctrl);
 759         usbhs_fifo_init(priv);
 760         usbhsg_uep_init(gpriv);
 761
 762         /* dcp init */
 763         dcp->pipe               = usbhs_dcp_malloc(priv);
 764         dcp->pipe->mod_private  = dcp;
 765         usbhs_pipe_config_update(dcp->pipe, 0, 0, 64);
 766
 767         /*
 768          * system config enble
 769          * - HI speed
 770          * - function
 771          * - usb module
 772          */
 773         usbhs_sys_function_ctrl(priv, 1);
 774
 775         /*
 776          * enable irq callback
 777          */
 778         mod->irq_dev_state      = usbhsg_irq_dev_state;
 779         mod->irq_ctrl_stage     = usbhsg_irq_ctrl_stage;
 780         usbhs_irq_callback_update(priv, mod);
 781
 782         return 0;
 783 }
 784
 785 static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 786 {
 787         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 788         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 789         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 790         struct device *dev = usbhs_priv_to_dev(priv);
 791         unsigned long flags;
 792         int ret = 0;
 793
 794         /********************  spin lock ********************/
 795         usbhs_lock(priv, flags);
 796
 797         usbhsg_status_clr(gpriv, status);
 798         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 799             !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
 800                 ret = -1; /* already done */
 801
 802         usbhs_unlock(priv, flags);
 803         /********************  spin unlock ********************/
 804
 805         if (ret < 0)
 806                 return 0; /* already done is not error */
 807
 808         /*
 809          * disable interrupt and systems if 1st try
 810          */
 811         usbhs_fifo_quit(priv);
 812
 813         /* disable all irq */
 814         mod->irq_dev_state      = NULL;
 815         mod->irq_ctrl_stage     = NULL;
 816         usbhs_irq_callback_update(priv, mod);
 817
 818         gpriv->gadget.speed = USB_SPEED_UNKNOWN;
 819
 820         /* disable sys */
 821         usbhs_sys_set_test_mode(priv, 0);
 822         usbhs_sys_function_ctrl(priv, 0);
 823
 824         usbhsg_pipe_disable(dcp);
 825
 826         dev_dbg(dev, "stop gadget\n");
 827
 828         return 0;
 829 }
 830
 831 /*
 832  *
 833  *              linux usb function
 834  *
 835  */
 836 static int usbhsg_gadget_start(struct usb_gadget *gadget,
 837                 struct usb_gadget_driver *driver)
 838 {
 839         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 840         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 841
 842         if (!driver             ||
 843             !driver->setup      ||
 844             driver->max_speed < USB_SPEED_FULL)
 845                 return -EINVAL;
 846
 847         /* first hook up the driver ... */
 848         gpriv->driver = driver;
 849         gpriv->gadget.dev.driver = &driver->driver;
 850
 851         return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
 852 }
 853
 854 static int usbhsg_gadget_stop(struct usb_gadget *gadget,
 855                 struct usb_gadget_driver *driver)
 856 {
 857         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 858         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 859
 860         if (!driver             ||
 861             !driver->unbind)
 862                 return -EINVAL;
 863
 864         usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
 865         gpriv->gadget.dev.driver = NULL;
 866         gpriv->driver = NULL;
 867
 868         return 0;
 869 }
 870
 871 /*
 872  *              usb gadget ops
 873  */
 874 static int usbhsg_get_frame(struct usb_gadget *gadget)
 875 {
 876         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 877         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 878
 879         return usbhs_frame_get_num(priv);
 880 }
 881
 882 static struct usb_gadget_ops usbhsg_gadget_ops = {
 883         .get_frame              = usbhsg_get_frame,
 884         .udc_start              = usbhsg_gadget_start,
 885         .udc_stop               = usbhsg_gadget_stop,
 886 };
 887
 888 static int usbhsg_start(struct usbhs_priv *priv)
 889 {
 890         return usbhsg_try_start(priv, USBHSG_STATUS_STARTED);
 891 }
 892
 893 static int usbhsg_stop(struct usbhs_priv *priv)
 894 {
 895         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 896
 897         /* cable disconnect */
 898         if (gpriv->driver &&
 899             gpriv->driver->disconnect)
 900                 gpriv->driver->disconnect(&gpriv->gadget);
 901
 902         return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED);
 903 }
 904
 905 static void usbhs_mod_gadget_release(struct device *pdev)
 906 {
 907         /* do nothing */
 908 }
 909
 910 int usbhs_mod_gadget_probe(struct usbhs_priv *priv)
 911 {
 912         struct usbhsg_gpriv *gpriv;
 913         struct usbhsg_uep *uep;
 914         struct device *dev = usbhs_priv_to_dev(priv);
 915         int pipe_size = usbhs_get_dparam(priv, pipe_size);
 916         int i;
 917         int ret;
 918
 919         gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
 920         if (!gpriv) {
 921                 dev_err(dev, "Could not allocate gadget priv\n");
 922                 return -ENOMEM;
 923         }
 924
 925         uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
 926         if (!uep) {
 927                 dev_err(dev, "Could not allocate ep\n");
 928                 ret = -ENOMEM;
 929                 goto usbhs_mod_gadget_probe_err_gpriv;
 930         }
 931
 932         /*
 933          * CAUTION
 934          *
 935          * There is no guarantee that it is possible to access usb module here.
 936          * Don't accesses to it.
 937          * The accesse will be enable after "usbhsg_start"
 938          */
 939
 940         /*
 941          * register itself
 942          */
 943         usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET);
 944
 945         /* init gpriv */
 946         gpriv->mod.name         = "gadget";
 947         gpriv->mod.start        = usbhsg_start;
 948         gpriv->mod.stop         = usbhsg_stop;
 949         gpriv->uep              = uep;
 950         gpriv->uep_size         = pipe_size;
 951         usbhsg_status_init(gpriv);
 952
 953         /*
 954          * init gadget
 955          */
 956         dev_set_name(&gpriv->gadget.dev, "gadget");
 957         gpriv->gadget.dev.parent        = dev;
 958         gpriv->gadget.dev.release       = usbhs_mod_gadget_release;
 959         gpriv->gadget.name              = "renesas_usbhs_udc";
 960         gpriv->gadget.ops               = &usbhsg_gadget_ops;
 961         gpriv->gadget.max_speed         = USB_SPEED_HIGH;
 962         ret = device_register(&gpriv->gadget.dev);
 963         if (ret < 0)
 964                 goto err_add_udc;
 965
 966         INIT_LIST_HEAD(&gpriv->gadget.ep_list);
 967
 968         /*
 969          * init usb_ep
 970          */
 971         usbhsg_for_each_uep_with_dcp(uep, gpriv, i) {
 972                 uep->gpriv      = gpriv;
 973                 snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i);
 974
 975                 uep->ep.name            = uep->ep_name;
 976                 uep->ep.ops             = &usbhsg_ep_ops;
 977                 INIT_LIST_HEAD(&uep->ep.ep_list);
 978
 979                 /* init DCP */
 980                 if (usbhsg_is_dcp(uep)) {
 981                         gpriv->gadget.ep0 = &uep->ep;
 982                         uep->ep.maxpacket = 64;
 983                 }
 984                 /* init normal pipe */
 985                 else {
 986                         uep->ep.maxpacket = 512;
 987                         list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
 988                 }
 989         }
 990
 991         ret = usb_add_gadget_udc(dev, &gpriv->gadget);
 992         if (ret)
 993                 goto err_register;
 994
 995
 996         dev_info(dev, "gadget probed\n");
 997
 998         return 0;
 999
1000 err_register:
1001         device_unregister(&gpriv->gadget.dev);
1002 err_add_udc:
1003         kfree(gpriv->uep);
1004
1005 usbhs_mod_gadget_probe_err_gpriv:
1006         kfree(gpriv);
1007
1008         return ret;
1009 }
1010
1011 void usbhs_mod_gadget_remove(struct usbhs_priv *priv)
1012 {
1013         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1014
1015         usb_del_gadget_udc(&gpriv->gadget);
1016
1017         device_unregister(&gpriv->gadget.dev);
1018
1019         kfree(gpriv->uep);
1020         kfree(gpriv);
1021 }