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 #define USBHSG_STATUS_SELF_POWERED      (1 << 3)
  59 };
  60
  61 struct usbhsg_recip_handle {
  62         char *name;
  63         int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  64                       struct usb_ctrlrequest *ctrl);
  65         int (*interface)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  66                          struct usb_ctrlrequest *ctrl);
  67         int (*endpoint)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  68                         struct usb_ctrlrequest *ctrl);
  69 };
  70
  71 /*
  72  *              macro
  73  */
  74 #define usbhsg_priv_to_gpriv(priv)                      \
  75         container_of(                                   \
  76                 usbhs_mod_get(priv, USBHS_GADGET),      \
  77                 struct usbhsg_gpriv, mod)
  78
  79 #define __usbhsg_for_each_uep(start, pos, g, i) \
  80         for ((i) = start;                                       \
  81              ((i) < (g)->uep_size) && ((pos) = (g)->uep + (i)); \
  82              (i)++)
  83
  84 #define usbhsg_for_each_uep(pos, gpriv, i)      \
  85         __usbhsg_for_each_uep(1, pos, gpriv, i)
  86
  87 #define usbhsg_for_each_uep_with_dcp(pos, gpriv, i)     \
  88         __usbhsg_for_each_uep(0, pos, gpriv, i)
  89
  90 #define usbhsg_gadget_to_gpriv(g)\
  91         container_of(g, struct usbhsg_gpriv, gadget)
  92
  93 #define usbhsg_req_to_ureq(r)\
  94         container_of(r, struct usbhsg_request, req)
  95
  96 #define usbhsg_ep_to_uep(e)             container_of(e, struct usbhsg_uep, ep)
  97 #define usbhsg_gpriv_to_dev(gp)         usbhs_priv_to_dev((gp)->mod.priv)
  98 #define usbhsg_gpriv_to_priv(gp)        ((gp)->mod.priv)
  99 #define usbhsg_gpriv_to_dcp(gp)         ((gp)->uep)
 100 #define usbhsg_gpriv_to_nth_uep(gp, i)  ((gp)->uep + i)
 101 #define usbhsg_uep_to_gpriv(u)          ((u)->gpriv)
 102 #define usbhsg_uep_to_pipe(u)           ((u)->pipe)
 103 #define usbhsg_pipe_to_uep(p)           ((p)->mod_private)
 104 #define usbhsg_is_dcp(u)                ((u) == usbhsg_gpriv_to_dcp((u)->gpriv))
 105
 106 #define usbhsg_ureq_to_pkt(u)           (&(u)->pkt)
 107 #define usbhsg_pkt_to_ureq(i)   \
 108         container_of(i, struct usbhsg_request, pkt)
 109
 110 #define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN)
 111
 112 /* status */
 113 #define usbhsg_status_init(gp)   do {(gp)->status = 0; } while (0)
 114 #define usbhsg_status_set(gp, b) (gp->status |=  b)
 115 #define usbhsg_status_clr(gp, b) (gp->status &= ~b)
 116 #define usbhsg_status_has(gp, b) (gp->status &   b)
 117
 118 /*
 119  *              queue push/pop
 120  */
 121 static void usbhsg_queue_pop(struct usbhsg_uep *uep,
 122                              struct usbhsg_request *ureq,
 123                              int status)
 124 {
 125         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 126         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 127         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 128
 129         dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
 130
 131         ureq->req.status = status;
 132         ureq->req.complete(&uep->ep, &ureq->req);
 133 }
 134
 135 static void usbhsg_queue_done(struct usbhs_priv *priv, struct usbhs_pkt *pkt)
 136 {
 137         struct usbhs_pipe *pipe = pkt->pipe;
 138         struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
 139         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 140
 141         ureq->req.actual = pkt->actual;
 142
 143         usbhsg_queue_pop(uep, ureq, 0);
 144 }
 145
 146 static void usbhsg_queue_push(struct usbhsg_uep *uep,
 147                               struct usbhsg_request *ureq)
 148 {
 149         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 150         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 151         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 152         struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
 153         struct usb_request *req = &ureq->req;
 154
 155         req->actual = 0;
 156         req->status = -EINPROGRESS;
 157         usbhs_pkt_push(pipe, pkt, usbhsg_queue_done,
 158                        req->buf, req->length, req->zero, -1);
 159         usbhs_pkt_start(pipe);
 160
 161         dev_dbg(dev, "pipe %d : queue push (%d)\n",
 162                 usbhs_pipe_number(pipe),
 163                 req->length);
 164 }
 165
 166 /*
 167  *              dma map/unmap
 168  */
 169 static int usbhsg_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 170 {
 171         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 172         struct usb_request *req = &ureq->req;
 173         struct usbhs_pipe *pipe = pkt->pipe;
 174         struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
 175         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 176         enum dma_data_direction dir;
 177         int ret = 0;
 178
 179         dir = usbhs_pipe_is_dir_host(pipe);
 180
 181         if (map) {
 182                 /* it can not use scatter/gather */
 183                 WARN_ON(req->num_sgs);
 184
 185                 ret = usb_gadget_map_request(&gpriv->gadget, req, dir);
 186                 if (ret < 0)
 187                         return ret;
 188
 189                 pkt->dma = req->dma;
 190         } else {
 191                 usb_gadget_unmap_request(&gpriv->gadget, req, dir);
 192         }
 193
 194         return ret;
 195 }
 196
 197 /*
 198  *              USB_TYPE_STANDARD / clear feature functions
 199  */
 200 static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
 201                                                  struct usbhsg_uep *uep,
 202                                                  struct usb_ctrlrequest *ctrl)
 203 {
 204         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 205         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 206         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 207
 208         usbhs_dcp_control_transfer_done(pipe);
 209
 210         return 0;
 211 }
 212
 213 static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
 214                                                    struct usbhsg_uep *uep,
 215                                                    struct usb_ctrlrequest *ctrl)
 216 {
 217         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 218         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 219
 220         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
 221                 usbhs_pipe_disable(pipe);
 222                 usbhs_pipe_sequence_data0(pipe);
 223                 usbhs_pipe_enable(pipe);
 224         }
 225
 226         usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 227
 228         usbhs_pkt_start(pipe);
 229
 230         return 0;
 231 }
 232
 233 static struct usbhsg_recip_handle req_clear_feature = {
 234         .name           = "clear feature",
 235         .device         = usbhsg_recip_handler_std_control_done,
 236         .interface      = usbhsg_recip_handler_std_control_done,
 237         .endpoint       = usbhsg_recip_handler_std_clear_endpoint,
 238 };
 239
 240 /*
 241  *              USB_TYPE_STANDARD / set feature functions
 242  */
 243 static int usbhsg_recip_handler_std_set_device(struct usbhs_priv *priv,
 244                                                  struct usbhsg_uep *uep,
 245                                                  struct usb_ctrlrequest *ctrl)
 246 {
 247         switch (le16_to_cpu(ctrl->wValue)) {
 248         case USB_DEVICE_TEST_MODE:
 249                 usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 250                 udelay(100);
 251                 usbhs_sys_set_test_mode(priv, le16_to_cpu(ctrl->wIndex >> 8));
 252                 break;
 253         default:
 254                 usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 255                 break;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static int usbhsg_recip_handler_std_set_endpoint(struct usbhs_priv *priv,
 262                                                  struct usbhsg_uep *uep,
 263                                                  struct usb_ctrlrequest *ctrl)
 264 {
 265         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 266
 267         usbhs_pipe_stall(pipe);
 268
 269         usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 270
 271         return 0;
 272 }
 273
 274 static struct usbhsg_recip_handle req_set_feature = {
 275         .name           = "set feature",
 276         .device         = usbhsg_recip_handler_std_set_device,
 277         .interface      = usbhsg_recip_handler_std_control_done,
 278         .endpoint       = usbhsg_recip_handler_std_set_endpoint,
 279 };
 280
 281 /*
 282  *              USB_TYPE_STANDARD / get status functions
 283  */
 284 static void __usbhsg_recip_send_complete(struct usb_ep *ep,
 285                                          struct usb_request *req)
 286 {
 287         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 288
 289         /* free allocated recip-buffer/usb_request */
 290         kfree(ureq->pkt.buf);
 291         usb_ep_free_request(ep, req);
 292 }
 293
 294 static void __usbhsg_recip_send_status(struct usbhsg_gpriv *gpriv,
 295                                        unsigned short status)
 296 {
 297         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 298         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 299         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 300         struct usb_request *req;
 301         unsigned short *buf;
 302
 303         /* alloc new usb_request for recip */
 304         req = usb_ep_alloc_request(&dcp->ep, GFP_ATOMIC);
 305         if (!req) {
 306                 dev_err(dev, "recip request allocation fail\n");
 307                 return;
 308         }
 309
 310         /* alloc recip data buffer */
 311         buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
 312         if (!buf) {
 313                 usb_ep_free_request(&dcp->ep, req);
 314                 dev_err(dev, "recip data allocation fail\n");
 315                 return;
 316         }
 317
 318         /* recip data is status */
 319         *buf = cpu_to_le16(status);
 320
 321         /* allocated usb_request/buffer will be freed */
 322         req->complete   = __usbhsg_recip_send_complete;
 323         req->buf        = buf;
 324         req->length     = sizeof(*buf);
 325         req->zero       = 0;
 326
 327         /* push packet */
 328         pipe->handler = &usbhs_fifo_pio_push_handler;
 329         usbhsg_queue_push(dcp, usbhsg_req_to_ureq(req));
 330 }
 331
 332 static int usbhsg_recip_handler_std_get_device(struct usbhs_priv *priv,
 333                                                struct usbhsg_uep *uep,
 334                                                struct usb_ctrlrequest *ctrl)
 335 {
 336         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 337         unsigned short status = 0;
 338
 339         if (usbhsg_status_has(gpriv, USBHSG_STATUS_SELF_POWERED))
 340                 status = 1 << USB_DEVICE_SELF_POWERED;
 341
 342         __usbhsg_recip_send_status(gpriv, status);
 343
 344         return 0;
 345 }
 346
 347 static int usbhsg_recip_handler_std_get_interface(struct usbhs_priv *priv,
 348                                                   struct usbhsg_uep *uep,
 349                                                   struct usb_ctrlrequest *ctrl)
 350 {
 351         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 352         unsigned short status = 0;
 353
 354         __usbhsg_recip_send_status(gpriv, status);
 355
 356         return 0;
 357 }
 358
 359 static int usbhsg_recip_handler_std_get_endpoint(struct usbhs_priv *priv,
 360                                                  struct usbhsg_uep *uep,
 361                                                  struct usb_ctrlrequest *ctrl)
 362 {
 363         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 364         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 365         unsigned short status = 0;
 366
 367         if (usbhs_pipe_is_stall(pipe))
 368                 status = 1 << USB_ENDPOINT_HALT;
 369
 370         __usbhsg_recip_send_status(gpriv, status);
 371
 372         return 0;
 373 }
 374
 375 static struct usbhsg_recip_handle req_get_status = {
 376         .name           = "get status",
 377         .device         = usbhsg_recip_handler_std_get_device,
 378         .interface      = usbhsg_recip_handler_std_get_interface,
 379         .endpoint       = usbhsg_recip_handler_std_get_endpoint,
 380 };
 381
 382 /*
 383  *              USB_TYPE handler
 384  */
 385 static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 386                                    struct usbhsg_recip_handle *handler,
 387                                    struct usb_ctrlrequest *ctrl)
 388 {
 389         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 390         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 391         struct usbhsg_uep *uep;
 392         struct usbhs_pipe *pipe;
 393         int recip = ctrl->bRequestType & USB_RECIP_MASK;
 394         int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 395         int ret = 0;
 396         int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
 397                     struct usb_ctrlrequest *ctrl);
 398         char *msg;
 399
 400         uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
 401         pipe = usbhsg_uep_to_pipe(uep);
 402         if (!pipe) {
 403                 dev_err(dev, "wrong recip request\n");
 404                 return -EINVAL;
 405         }
 406
 407         switch (recip) {
 408         case USB_RECIP_DEVICE:
 409                 msg     = "DEVICE";
 410                 func    = handler->device;
 411                 break;
 412         case USB_RECIP_INTERFACE:
 413                 msg     = "INTERFACE";
 414                 func    = handler->interface;
 415                 break;
 416         case USB_RECIP_ENDPOINT:
 417                 msg     = "ENDPOINT";
 418                 func    = handler->endpoint;
 419                 break;
 420         default:
 421                 dev_warn(dev, "unsupported RECIP(%d)\n", recip);
 422                 func = NULL;
 423                 ret = -EINVAL;
 424         }
 425
 426         if (func) {
 427                 dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
 428                 ret = func(priv, uep, ctrl);
 429         }
 430
 431         return ret;
 432 }
 433
 434 /*
 435  *              irq functions
 436  *
 437  * it will be called from usbhs_interrupt
 438  */
 439 static int usbhsg_irq_dev_state(struct usbhs_priv *priv,
 440                                 struct usbhs_irq_state *irq_state)
 441 {
 442         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 443         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 444
 445         gpriv->gadget.speed = usbhs_bus_get_speed(priv);
 446
 447         dev_dbg(dev, "state = %x : speed : %d\n",
 448                 usbhs_status_get_device_state(irq_state),
 449                 gpriv->gadget.speed);
 450
 451         return 0;
 452 }
 453
 454 static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
 455                                  struct usbhs_irq_state *irq_state)
 456 {
 457         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 458         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 459         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 460         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 461         struct usb_ctrlrequest ctrl;
 462         struct usbhsg_recip_handle *recip_handler = NULL;
 463         int stage = usbhs_status_get_ctrl_stage(irq_state);
 464         int ret = 0;
 465
 466         dev_dbg(dev, "stage = %d\n", stage);
 467
 468         /*
 469          * see Manual
 470          *
 471          *  "Operation"
 472          *  - "Interrupt Function"
 473          *    - "Control Transfer Stage Transition Interrupt"
 474          *      - Fig. "Control Transfer Stage Transitions"
 475          */
 476
 477         switch (stage) {
 478         case READ_DATA_STAGE:
 479                 pipe->handler = &usbhs_fifo_pio_push_handler;
 480                 break;
 481         case WRITE_DATA_STAGE:
 482                 pipe->handler = &usbhs_fifo_pio_pop_handler;
 483                 break;
 484         case NODATA_STATUS_STAGE:
 485                 pipe->handler = &usbhs_ctrl_stage_end_handler;
 486                 break;
 487         default:
 488                 return ret;
 489         }
 490
 491         /*
 492          * get usb request
 493          */
 494         usbhs_usbreq_get_val(priv, &ctrl);
 495
 496         switch (ctrl.bRequestType & USB_TYPE_MASK) {
 497         case USB_TYPE_STANDARD:
 498                 switch (ctrl.bRequest) {
 499                 case USB_REQ_CLEAR_FEATURE:
 500                         recip_handler = &req_clear_feature;
 501                         break;
 502                 case USB_REQ_SET_FEATURE:
 503                         recip_handler = &req_set_feature;
 504                         break;
 505                 case USB_REQ_GET_STATUS:
 506                         recip_handler = &req_get_status;
 507                         break;
 508                 }
 509         }
 510
 511         /*
 512          * setup stage / run recip
 513          */
 514         if (recip_handler)
 515                 ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
 516         else
 517                 ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
 518
 519         if (ret < 0)
 520                 usbhs_pipe_stall(pipe);
 521
 522         return ret;
 523 }
 524
 525 /*
 526  *
 527  *              usb_dcp_ops
 528  *
 529  */
 530 static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
 531 {
 532         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 533         struct usbhs_pkt *pkt;
 534
 535         while (1) {
 536                 pkt = usbhs_pkt_pop(pipe, NULL);
 537                 if (!pkt)
 538                         break;
 539
 540                 usbhsg_queue_pop(uep, usbhsg_pkt_to_ureq(pkt), -ECONNRESET);
 541         }
 542
 543         usbhs_pipe_disable(pipe);
 544
 545         return 0;
 546 }
 547
 548 /*
 549  *
 550  *              usb_ep_ops
 551  *
 552  */
 553 static int usbhsg_ep_enable(struct usb_ep *ep,
 554                          const struct usb_endpoint_descriptor *desc)
 555 {
 556         struct usbhsg_uep *uep   = usbhsg_ep_to_uep(ep);
 557         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 558         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 559         struct usbhs_pipe *pipe;
 560         int ret = -EIO;
 561
 562         /*
 563          * if it already have pipe,
 564          * nothing to do
 565          */
 566         if (uep->pipe) {
 567                 usbhs_pipe_clear(uep->pipe);
 568                 usbhs_pipe_sequence_data0(uep->pipe);
 569                 return 0;
 570         }
 571
 572         pipe = usbhs_pipe_malloc(priv,
 573                                  usb_endpoint_type(desc),
 574                                  usb_endpoint_dir_in(desc));
 575         if (pipe) {
 576                 uep->pipe               = pipe;
 577                 pipe->mod_private       = uep;
 578
 579                 /* set epnum / maxp */
 580                 usbhs_pipe_config_update(pipe, 0,
 581                                          usb_endpoint_num(desc),
 582                                          usb_endpoint_maxp(desc));
 583
 584                 /*
 585                  * usbhs_fifo_dma_push/pop_handler try to
 586                  * use dmaengine if possible.
 587                  * It will use pio handler if impossible.
 588                  */
 589                 if (usb_endpoint_dir_in(desc))
 590                         pipe->handler = &usbhs_fifo_dma_push_handler;
 591                 else
 592                         pipe->handler = &usbhs_fifo_dma_pop_handler;
 593
 594                 ret = 0;
 595         }
 596
 597         return ret;
 598 }
 599
 600 static int usbhsg_ep_disable(struct usb_ep *ep)
 601 {
 602         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 603
 604         usbhsg_pipe_disable(uep);
 605
 606         uep->pipe->mod_private  = NULL;
 607         uep->pipe               = NULL;
 608
 609         return 0;
 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
 761         /* dcp init instead of usbhsg_ep_enable() */
 762         dcp->pipe               = usbhs_dcp_malloc(priv);
 763         dcp->pipe->mod_private  = dcp;
 764         usbhs_pipe_config_update(dcp->pipe, 0, 0, 64);
 765
 766         /*
 767          * system config enble
 768          * - HI speed
 769          * - function
 770          * - usb module
 771          */
 772         usbhs_sys_function_ctrl(priv, 1);
 773
 774         /*
 775          * enable irq callback
 776          */
 777         mod->irq_dev_state      = usbhsg_irq_dev_state;
 778         mod->irq_ctrl_stage     = usbhsg_irq_ctrl_stage;
 779         usbhs_irq_callback_update(priv, mod);
 780
 781         return 0;
 782 }
 783
 784 static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 785 {
 786         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 787         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 788         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 789         struct device *dev = usbhs_priv_to_dev(priv);
 790         unsigned long flags;
 791         int ret = 0;
 792
 793         /********************  spin lock ********************/
 794         usbhs_lock(priv, flags);
 795
 796         usbhsg_status_clr(gpriv, status);
 797         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 798             !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
 799                 ret = -1; /* already done */
 800
 801         usbhs_unlock(priv, flags);
 802         /********************  spin unlock ********************/
 803
 804         if (ret < 0)
 805                 return 0; /* already done is not error */
 806
 807         /*
 808          * disable interrupt and systems if 1st try
 809          */
 810         usbhs_fifo_quit(priv);
 811
 812         /* disable all irq */
 813         mod->irq_dev_state      = NULL;
 814         mod->irq_ctrl_stage     = NULL;
 815         usbhs_irq_callback_update(priv, mod);
 816
 817         gpriv->gadget.speed = USB_SPEED_UNKNOWN;
 818
 819         /* disable sys */
 820         usbhs_sys_set_test_mode(priv, 0);
 821         usbhs_sys_function_ctrl(priv, 0);
 822
 823         usbhsg_ep_disable(&dcp->ep);
 824
 825         dev_dbg(dev, "stop gadget\n");
 826
 827         return 0;
 828 }
 829
 830 /*
 831  *
 832  *              linux usb function
 833  *
 834  */
 835 static int usbhsg_gadget_start(struct usb_gadget *gadget,
 836                 struct usb_gadget_driver *driver)
 837 {
 838         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 839         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 840
 841         if (!driver             ||
 842             !driver->setup      ||
 843             driver->max_speed < USB_SPEED_FULL)
 844                 return -EINVAL;
 845
 846         /* first hook up the driver ... */
 847         gpriv->driver = driver;
 848
 849         return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
 850 }
 851
 852 static int usbhsg_gadget_stop(struct usb_gadget *gadget,
 853                 struct usb_gadget_driver *driver)
 854 {
 855         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 856         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 857
 858         usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
 859         gpriv->driver = NULL;
 860
 861         return 0;
 862 }
 863
 864 /*
 865  *              usb gadget ops
 866  */
 867 static int usbhsg_get_frame(struct usb_gadget *gadget)
 868 {
 869         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 870         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 871
 872         return usbhs_frame_get_num(priv);
 873 }
 874
 875 static int usbhsg_pullup(struct usb_gadget *gadget, int is_on)
 876 {
 877         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 878         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 879
 880         usbhs_sys_function_pullup(priv, is_on);
 881
 882         return 0;
 883 }
 884
 885 static int usbhsg_set_selfpowered(struct usb_gadget *gadget, int is_self)
 886 {
 887         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 888
 889         if (is_self)
 890                 usbhsg_status_set(gpriv, USBHSG_STATUS_SELF_POWERED);
 891         else
 892                 usbhsg_status_clr(gpriv, USBHSG_STATUS_SELF_POWERED);
 893
 894         return 0;
 895 }
 896
 897 static const struct usb_gadget_ops usbhsg_gadget_ops = {
 898         .get_frame              = usbhsg_get_frame,
 899         .set_selfpowered        = usbhsg_set_selfpowered,
 900         .udc_start              = usbhsg_gadget_start,
 901         .udc_stop               = usbhsg_gadget_stop,
 902         .pullup                 = usbhsg_pullup,
 903 };
 904
 905 static int usbhsg_start(struct usbhs_priv *priv)
 906 {
 907         return usbhsg_try_start(priv, USBHSG_STATUS_STARTED);
 908 }
 909
 910 static int usbhsg_stop(struct usbhs_priv *priv)
 911 {
 912         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 913
 914         /* cable disconnect */
 915         if (gpriv->driver &&
 916             gpriv->driver->disconnect)
 917                 gpriv->driver->disconnect(&gpriv->gadget);
 918
 919         return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED);
 920 }
 921
 922 int usbhs_mod_gadget_probe(struct usbhs_priv *priv)
 923 {
 924         struct usbhsg_gpriv *gpriv;
 925         struct usbhsg_uep *uep;
 926         struct device *dev = usbhs_priv_to_dev(priv);
 927         int pipe_size = usbhs_get_dparam(priv, pipe_size);
 928         int i;
 929         int ret;
 930
 931         gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
 932         if (!gpriv) {
 933                 dev_err(dev, "Could not allocate gadget priv\n");
 934                 return -ENOMEM;
 935         }
 936
 937         uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
 938         if (!uep) {
 939                 dev_err(dev, "Could not allocate ep\n");
 940                 ret = -ENOMEM;
 941                 goto usbhs_mod_gadget_probe_err_gpriv;
 942         }
 943
 944         /*
 945          * CAUTION
 946          *
 947          * There is no guarantee that it is possible to access usb module here.
 948          * Don't accesses to it.
 949          * The accesse will be enable after "usbhsg_start"
 950          */
 951
 952         /*
 953          * register itself
 954          */
 955         usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET);
 956
 957         /* init gpriv */
 958         gpriv->mod.name         = "gadget";
 959         gpriv->mod.start        = usbhsg_start;
 960         gpriv->mod.stop         = usbhsg_stop;
 961         gpriv->uep              = uep;
 962         gpriv->uep_size         = pipe_size;
 963         usbhsg_status_init(gpriv);
 964
 965         /*
 966          * init gadget
 967          */
 968         gpriv->gadget.dev.parent        = dev;
 969         gpriv->gadget.name              = "renesas_usbhs_udc";
 970         gpriv->gadget.ops               = &usbhsg_gadget_ops;
 971         gpriv->gadget.max_speed         = USB_SPEED_HIGH;
 972
 973         INIT_LIST_HEAD(&gpriv->gadget.ep_list);
 974
 975         /*
 976          * init usb_ep
 977          */
 978         usbhsg_for_each_uep_with_dcp(uep, gpriv, i) {
 979                 uep->gpriv      = gpriv;
 980                 uep->pipe       = NULL;
 981                 snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i);
 982
 983                 uep->ep.name            = uep->ep_name;
 984                 uep->ep.ops             = &usbhsg_ep_ops;
 985                 INIT_LIST_HEAD(&uep->ep.ep_list);
 986
 987                 /* init DCP */
 988                 if (usbhsg_is_dcp(uep)) {
 989                         gpriv->gadget.ep0 = &uep->ep;
 990                         usb_ep_set_maxpacket_limit(&uep->ep, 64);
 991                 }
 992                 /* init normal pipe */
 993                 else {
 994                         usb_ep_set_maxpacket_limit(&uep->ep, 512);
 995                         list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
 996                 }
 997         }
 998
 999         ret = usb_add_gadget_udc(dev, &gpriv->gadget);
1000         if (ret)
1001                 goto err_add_udc;
1002
1003
1004         dev_info(dev, "gadget probed\n");
1005
1006         return 0;
1007
1008 err_add_udc:
1009         kfree(gpriv->uep);
1010
1011 usbhs_mod_gadget_probe_err_gpriv:
1012         kfree(gpriv);
1013
1014         return ret;
1015 }
1016
1017 void usbhs_mod_gadget_remove(struct usbhs_priv *priv)
1018 {
1019         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1020
1021         usb_del_gadget_udc(&gpriv->gadget);
1022
1023         kfree(gpriv->uep);
1024         kfree(gpriv);
1025 }