drivers/usb/renesas_usbhs/mod_gadget.c

   1 // SPDX-License-Identifier: GPL-1.0+
   2 /*
   3  * Renesas USB driver
   4  *
   5  * Copyright (C) 2011 Renesas Solutions Corp.
   6  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   7  */
   8 #include <linux/delay.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/io.h>
  11 #include <linux/module.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/usb/ch9.h>
  14 #include <linux/usb/gadget.h>
  15 #include <linux/usb/otg.h>
  16 #include "common.h"
  17
  18 /*
  19  *              struct
  20  */
  21 struct usbhsg_request {
  22         struct usb_request      req;
  23         struct usbhs_pkt        pkt;
  24 };
  25
  26 #define EP_NAME_SIZE 8
  27 struct usbhsg_gpriv;
  28 struct usbhsg_uep {
  29         struct usb_ep            ep;
  30         struct usbhs_pipe       *pipe;
  31         spinlock_t              lock;   /* protect the pipe */
  32
  33         char ep_name[EP_NAME_SIZE];
  34
  35         struct usbhsg_gpriv *gpriv;
  36 };
  37
  38 struct usbhsg_gpriv {
  39         struct usb_gadget        gadget;
  40         struct usbhs_mod         mod;
  41
  42         struct usbhsg_uep       *uep;
  43         int                      uep_size;
  44
  45         struct usb_gadget_driver        *driver;
  46         struct usb_phy          *transceiver;
  47         bool                     vbus_active;
  48
  49         u32     status;
  50 #define USBHSG_STATUS_STARTED           (1 << 0)
  51 #define USBHSG_STATUS_REGISTERD         (1 << 1)
  52 #define USBHSG_STATUS_WEDGE             (1 << 2)
  53 #define USBHSG_STATUS_SELF_POWERED      (1 << 3)
  54 #define USBHSG_STATUS_SOFT_CONNECT      (1 << 4)
  55 };
  56
  57 struct usbhsg_recip_handle {
  58         char *name;
  59         int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  60                       struct usb_ctrlrequest *ctrl);
  61         int (*interface)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  62                          struct usb_ctrlrequest *ctrl);
  63         int (*endpoint)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
  64                         struct usb_ctrlrequest *ctrl);
  65 };
  66
  67 /*
  68  *              macro
  69  */
  70 #define usbhsg_priv_to_gpriv(priv)                      \
  71         container_of(                                   \
  72                 usbhs_mod_get(priv, USBHS_GADGET),      \
  73                 struct usbhsg_gpriv, mod)
  74
  75 #define __usbhsg_for_each_uep(start, pos, g, i) \
  76         for ((i) = start;                                       \
  77              ((i) < (g)->uep_size) && ((pos) = (g)->uep + (i)); \
  78              (i)++)
  79
  80 #define usbhsg_for_each_uep(pos, gpriv, i)      \
  81         __usbhsg_for_each_uep(1, pos, gpriv, i)
  82
  83 #define usbhsg_for_each_uep_with_dcp(pos, gpriv, i)     \
  84         __usbhsg_for_each_uep(0, pos, gpriv, i)
  85
  86 #define usbhsg_gadget_to_gpriv(g)\
  87         container_of(g, struct usbhsg_gpriv, gadget)
  88
  89 #define usbhsg_req_to_ureq(r)\
  90         container_of(r, struct usbhsg_request, req)
  91
  92 #define usbhsg_ep_to_uep(e)             container_of(e, struct usbhsg_uep, ep)
  93 #define usbhsg_gpriv_to_dev(gp)         usbhs_priv_to_dev((gp)->mod.priv)
  94 #define usbhsg_gpriv_to_priv(gp)        ((gp)->mod.priv)
  95 #define usbhsg_gpriv_to_dcp(gp)         ((gp)->uep)
  96 #define usbhsg_gpriv_to_nth_uep(gp, i)  ((gp)->uep + i)
  97 #define usbhsg_uep_to_gpriv(u)          ((u)->gpriv)
  98 #define usbhsg_uep_to_pipe(u)           ((u)->pipe)
  99 #define usbhsg_pipe_to_uep(p)           ((p)->mod_private)
 100 #define usbhsg_is_dcp(u)                ((u) == usbhsg_gpriv_to_dcp((u)->gpriv))
 101
 102 #define usbhsg_ureq_to_pkt(u)           (&(u)->pkt)
 103 #define usbhsg_pkt_to_ureq(i)   \
 104         container_of(i, struct usbhsg_request, pkt)
 105
 106 #define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN)
 107
 108 /* status */
 109 #define usbhsg_status_init(gp)   do {(gp)->status = 0; } while (0)
 110 #define usbhsg_status_set(gp, b) (gp->status |=  b)
 111 #define usbhsg_status_clr(gp, b) (gp->status &= ~b)
 112 #define usbhsg_status_has(gp, b) (gp->status &   b)
 113
 114 /*
 115  *              queue push/pop
 116  */
 117 static void __usbhsg_queue_pop(struct usbhsg_uep *uep,
 118                                struct usbhsg_request *ureq,
 119                                int status)
 120 {
 121         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 122         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 123         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 124         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 125
 126         if (pipe)
 127                 dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
 128
 129         ureq->req.status = status;
 130         spin_unlock(usbhs_priv_to_lock(priv));
 131         usb_gadget_giveback_request(&uep->ep, &ureq->req);
 132         spin_lock(usbhs_priv_to_lock(priv));
 133 }
 134
 135 static void usbhsg_queue_pop(struct usbhsg_uep *uep,
 136                              struct usbhsg_request *ureq,
 137                              int status)
 138 {
 139         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 140         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 141         unsigned long flags;
 142
 143         usbhs_lock(priv, flags);
 144         __usbhsg_queue_pop(uep, ureq, status);
 145         usbhs_unlock(priv, flags);
 146 }
 147
 148 static void usbhsg_queue_done(struct usbhs_priv *priv, struct usbhs_pkt *pkt)
 149 {
 150         struct usbhs_pipe *pipe = pkt->pipe;
 151         struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
 152         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 153         unsigned long flags;
 154
 155         ureq->req.actual = pkt->actual;
 156
 157         usbhs_lock(priv, flags);
 158         if (uep)
 159                 __usbhsg_queue_pop(uep, ureq, 0);
 160         usbhs_unlock(priv, flags);
 161 }
 162
 163 static void usbhsg_queue_push(struct usbhsg_uep *uep,
 164                               struct usbhsg_request *ureq)
 165 {
 166         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 167         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 168         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 169         struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
 170         struct usb_request *req = &ureq->req;
 171
 172         req->actual = 0;
 173         req->status = -EINPROGRESS;
 174         usbhs_pkt_push(pipe, pkt, usbhsg_queue_done,
 175                        req->buf, req->length, req->zero, -1);
 176         usbhs_pkt_start(pipe);
 177
 178         dev_dbg(dev, "pipe %d : queue push (%d)\n",
 179                 usbhs_pipe_number(pipe),
 180                 req->length);
 181 }
 182
 183 /*
 184  *              dma map/unmap
 185  */
 186 static int usbhsg_dma_map_ctrl(struct device *dma_dev, struct usbhs_pkt *pkt,
 187                                int map)
 188 {
 189         struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt);
 190         struct usb_request *req = &ureq->req;
 191         struct usbhs_pipe *pipe = pkt->pipe;
 192         enum dma_data_direction dir;
 193         int ret = 0;
 194
 195         dir = usbhs_pipe_is_dir_host(pipe);
 196
 197         if (map) {
 198                 /* it can not use scatter/gather */
 199                 WARN_ON(req->num_sgs);
 200
 201                 ret = usb_gadget_map_request_by_dev(dma_dev, req, dir);
 202                 if (ret < 0)
 203                         return ret;
 204
 205                 pkt->dma = req->dma;
 206         } else {
 207                 usb_gadget_unmap_request_by_dev(dma_dev, req, dir);
 208         }
 209
 210         return ret;
 211 }
 212
 213 /*
 214  *              USB_TYPE_STANDARD / clear feature functions
 215  */
 216 static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
 217                                                  struct usbhsg_uep *uep,
 218                                                  struct usb_ctrlrequest *ctrl)
 219 {
 220         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 221         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 222         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 223
 224         usbhs_dcp_control_transfer_done(pipe);
 225
 226         return 0;
 227 }
 228
 229 static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
 230                                                    struct usbhsg_uep *uep,
 231                                                    struct usb_ctrlrequest *ctrl)
 232 {
 233         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 234         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 235
 236         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
 237                 usbhs_pipe_disable(pipe);
 238                 usbhs_pipe_sequence_data0(pipe);
 239                 usbhs_pipe_enable(pipe);
 240         }
 241
 242         usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 243
 244         usbhs_pkt_start(pipe);
 245
 246         return 0;
 247 }
 248
 249 static struct usbhsg_recip_handle req_clear_feature = {
 250         .name           = "clear feature",
 251         .device         = usbhsg_recip_handler_std_control_done,
 252         .interface      = usbhsg_recip_handler_std_control_done,
 253         .endpoint       = usbhsg_recip_handler_std_clear_endpoint,
 254 };
 255
 256 /*
 257  *              USB_TYPE_STANDARD / set feature functions
 258  */
 259 static int usbhsg_recip_handler_std_set_device(struct usbhs_priv *priv,
 260                                                  struct usbhsg_uep *uep,
 261                                                  struct usb_ctrlrequest *ctrl)
 262 {
 263         switch (le16_to_cpu(ctrl->wValue)) {
 264         case USB_DEVICE_TEST_MODE:
 265                 usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 266                 udelay(100);
 267                 usbhs_sys_set_test_mode(priv, le16_to_cpu(ctrl->wIndex >> 8));
 268                 break;
 269         default:
 270                 usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 271                 break;
 272         }
 273
 274         return 0;
 275 }
 276
 277 static int usbhsg_recip_handler_std_set_endpoint(struct usbhs_priv *priv,
 278                                                  struct usbhsg_uep *uep,
 279                                                  struct usb_ctrlrequest *ctrl)
 280 {
 281         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 282
 283         usbhs_pipe_stall(pipe);
 284
 285         usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 286
 287         return 0;
 288 }
 289
 290 static struct usbhsg_recip_handle req_set_feature = {
 291         .name           = "set feature",
 292         .device         = usbhsg_recip_handler_std_set_device,
 293         .interface      = usbhsg_recip_handler_std_control_done,
 294         .endpoint       = usbhsg_recip_handler_std_set_endpoint,
 295 };
 296
 297 /*
 298  *              USB_TYPE_STANDARD / get status functions
 299  */
 300 static void __usbhsg_recip_send_complete(struct usb_ep *ep,
 301                                          struct usb_request *req)
 302 {
 303         struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 304
 305         /* free allocated recip-buffer/usb_request */
 306         kfree(ureq->pkt.buf);
 307         usb_ep_free_request(ep, req);
 308 }
 309
 310 static void __usbhsg_recip_send_status(struct usbhsg_gpriv *gpriv,
 311                                        unsigned short status)
 312 {
 313         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 314         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 315         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 316         struct usb_request *req;
 317         unsigned short *buf;
 318
 319         /* alloc new usb_request for recip */
 320         req = usb_ep_alloc_request(&dcp->ep, GFP_ATOMIC);
 321         if (!req) {
 322                 dev_err(dev, "recip request allocation fail\n");
 323                 return;
 324         }
 325
 326         /* alloc recip data buffer */
 327         buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
 328         if (!buf) {
 329                 usb_ep_free_request(&dcp->ep, req);
 330                 return;
 331         }
 332
 333         /* recip data is status */
 334         *buf = cpu_to_le16(status);
 335
 336         /* allocated usb_request/buffer will be freed */
 337         req->complete   = __usbhsg_recip_send_complete;
 338         req->buf        = buf;
 339         req->length     = sizeof(*buf);
 340         req->zero       = 0;
 341
 342         /* push packet */
 343         pipe->handler = &usbhs_fifo_pio_push_handler;
 344         usbhsg_queue_push(dcp, usbhsg_req_to_ureq(req));
 345 }
 346
 347 static int usbhsg_recip_handler_std_get_device(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         if (usbhsg_status_has(gpriv, USBHSG_STATUS_SELF_POWERED))
 355                 status = 1 << USB_DEVICE_SELF_POWERED;
 356
 357         __usbhsg_recip_send_status(gpriv, status);
 358
 359         return 0;
 360 }
 361
 362 static int usbhsg_recip_handler_std_get_interface(struct usbhs_priv *priv,
 363                                                   struct usbhsg_uep *uep,
 364                                                   struct usb_ctrlrequest *ctrl)
 365 {
 366         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 367         unsigned short status = 0;
 368
 369         __usbhsg_recip_send_status(gpriv, status);
 370
 371         return 0;
 372 }
 373
 374 static int usbhsg_recip_handler_std_get_endpoint(struct usbhs_priv *priv,
 375                                                  struct usbhsg_uep *uep,
 376                                                  struct usb_ctrlrequest *ctrl)
 377 {
 378         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 379         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 380         unsigned short status = 0;
 381
 382         if (usbhs_pipe_is_stall(pipe))
 383                 status = 1 << USB_ENDPOINT_HALT;
 384
 385         __usbhsg_recip_send_status(gpriv, status);
 386
 387         return 0;
 388 }
 389
 390 static struct usbhsg_recip_handle req_get_status = {
 391         .name           = "get status",
 392         .device         = usbhsg_recip_handler_std_get_device,
 393         .interface      = usbhsg_recip_handler_std_get_interface,
 394         .endpoint       = usbhsg_recip_handler_std_get_endpoint,
 395 };
 396
 397 /*
 398  *              USB_TYPE handler
 399  */
 400 static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 401                                    struct usbhsg_recip_handle *handler,
 402                                    struct usb_ctrlrequest *ctrl)
 403 {
 404         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 405         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 406         struct usbhsg_uep *uep;
 407         struct usbhs_pipe *pipe;
 408         int recip = ctrl->bRequestType & USB_RECIP_MASK;
 409         int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 410         int ret = 0;
 411         int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
 412                     struct usb_ctrlrequest *ctrl);
 413         char *msg;
 414
 415         uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
 416         pipe = usbhsg_uep_to_pipe(uep);
 417         if (!pipe) {
 418                 dev_err(dev, "wrong recip request\n");
 419                 return -EINVAL;
 420         }
 421
 422         switch (recip) {
 423         case USB_RECIP_DEVICE:
 424                 msg     = "DEVICE";
 425                 func    = handler->device;
 426                 break;
 427         case USB_RECIP_INTERFACE:
 428                 msg     = "INTERFACE";
 429                 func    = handler->interface;
 430                 break;
 431         case USB_RECIP_ENDPOINT:
 432                 msg     = "ENDPOINT";
 433                 func    = handler->endpoint;
 434                 break;
 435         default:
 436                 dev_warn(dev, "unsupported RECIP(%d)\n", recip);
 437                 func = NULL;
 438                 ret = -EINVAL;
 439         }
 440
 441         if (func) {
 442                 dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
 443                 ret = func(priv, uep, ctrl);
 444         }
 445
 446         return ret;
 447 }
 448
 449 /*
 450  *              irq functions
 451  *
 452  * it will be called from usbhs_interrupt
 453  */
 454 static int usbhsg_irq_dev_state(struct usbhs_priv *priv,
 455                                 struct usbhs_irq_state *irq_state)
 456 {
 457         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 458         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 459
 460         gpriv->gadget.speed = usbhs_bus_get_speed(priv);
 461
 462         dev_dbg(dev, "state = %x : speed : %d\n",
 463                 usbhs_status_get_device_state(irq_state),
 464                 gpriv->gadget.speed);
 465
 466         return 0;
 467 }
 468
 469 static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
 470                                  struct usbhs_irq_state *irq_state)
 471 {
 472         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 473         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 474         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
 475         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 476         struct usb_ctrlrequest ctrl;
 477         struct usbhsg_recip_handle *recip_handler = NULL;
 478         int stage = usbhs_status_get_ctrl_stage(irq_state);
 479         int ret = 0;
 480
 481         dev_dbg(dev, "stage = %d\n", stage);
 482
 483         /*
 484          * see Manual
 485          *
 486          *  "Operation"
 487          *  - "Interrupt Function"
 488          *    - "Control Transfer Stage Transition Interrupt"
 489          *      - Fig. "Control Transfer Stage Transitions"
 490          */
 491
 492         switch (stage) {
 493         case READ_DATA_STAGE:
 494                 pipe->handler = &usbhs_fifo_pio_push_handler;
 495                 break;
 496         case WRITE_DATA_STAGE:
 497                 pipe->handler = &usbhs_fifo_pio_pop_handler;
 498                 break;
 499         case NODATA_STATUS_STAGE:
 500                 pipe->handler = &usbhs_ctrl_stage_end_handler;
 501                 break;
 502         case READ_STATUS_STAGE:
 503         case WRITE_STATUS_STAGE:
 504                 usbhs_dcp_control_transfer_done(pipe);
 505         default:
 506                 return ret;
 507         }
 508
 509         /*
 510          * get usb request
 511          */
 512         usbhs_usbreq_get_val(priv, &ctrl);
 513
 514         switch (ctrl.bRequestType & USB_TYPE_MASK) {
 515         case USB_TYPE_STANDARD:
 516                 switch (ctrl.bRequest) {
 517                 case USB_REQ_CLEAR_FEATURE:
 518                         recip_handler = &req_clear_feature;
 519                         break;
 520                 case USB_REQ_SET_FEATURE:
 521                         recip_handler = &req_set_feature;
 522                         break;
 523                 case USB_REQ_GET_STATUS:
 524                         recip_handler = &req_get_status;
 525                         break;
 526                 }
 527         }
 528
 529         /*
 530          * setup stage / run recip
 531          */
 532         if (recip_handler)
 533                 ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
 534         else
 535                 ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
 536
 537         if (ret < 0)
 538                 usbhs_pipe_stall(pipe);
 539
 540         return ret;
 541 }
 542
 543 /*
 544  *
 545  *              usb_dcp_ops
 546  *
 547  */
 548 static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
 549 {
 550         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 551         struct usbhs_pkt *pkt;
 552
 553         while (1) {
 554                 pkt = usbhs_pkt_pop(pipe, NULL);
 555                 if (!pkt)
 556                         break;
 557
 558                 usbhsg_queue_pop(uep, usbhsg_pkt_to_ureq(pkt), -ESHUTDOWN);
 559         }
 560
 561         usbhs_pipe_disable(pipe);
 562
 563         return 0;
 564 }
 565
 566 /*
 567  *
 568  *              usb_ep_ops
 569  *
 570  */
 571 static int usbhsg_ep_enable(struct usb_ep *ep,
 572                          const struct usb_endpoint_descriptor *desc)
 573 {
 574         struct usbhsg_uep *uep   = usbhsg_ep_to_uep(ep);
 575         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 576         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 577         struct usbhs_pipe *pipe;
 578         int ret = -EIO;
 579         unsigned long flags;
 580
 581         usbhs_lock(priv, flags);
 582
 583         /*
 584          * if it already have pipe,
 585          * nothing to do
 586          */
 587         if (uep->pipe) {
 588                 usbhs_pipe_clear(uep->pipe);
 589                 usbhs_pipe_sequence_data0(uep->pipe);
 590                 ret = 0;
 591                 goto usbhsg_ep_enable_end;
 592         }
 593
 594         pipe = usbhs_pipe_malloc(priv,
 595                                  usb_endpoint_type(desc),
 596                                  usb_endpoint_dir_in(desc));
 597         if (pipe) {
 598                 uep->pipe               = pipe;
 599                 pipe->mod_private       = uep;
 600
 601                 /* set epnum / maxp */
 602                 usbhs_pipe_config_update(pipe, 0,
 603                                          usb_endpoint_num(desc),
 604                                          usb_endpoint_maxp(desc));
 605
 606                 /*
 607                  * usbhs_fifo_dma_push/pop_handler try to
 608                  * use dmaengine if possible.
 609                  * It will use pio handler if impossible.
 610                  */
 611                 if (usb_endpoint_dir_in(desc)) {
 612                         pipe->handler = &usbhs_fifo_dma_push_handler;
 613                 } else {
 614                         pipe->handler = &usbhs_fifo_dma_pop_handler;
 615                         usbhs_xxxsts_clear(priv, BRDYSTS,
 616                                            usbhs_pipe_number(pipe));
 617                 }
 618
 619                 ret = 0;
 620         }
 621
 622 usbhsg_ep_enable_end:
 623         usbhs_unlock(priv, flags);
 624
 625         return ret;
 626 }
 627
 628 static int usbhsg_ep_disable(struct usb_ep *ep)
 629 {
 630         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 631         struct usbhs_pipe *pipe;
 632         unsigned long flags;
 633
 634         spin_lock_irqsave(&uep->lock, flags);
 635         pipe = usbhsg_uep_to_pipe(uep);
 636         if (!pipe)
 637                 goto out;
 638
 639         usbhsg_pipe_disable(uep);
 640         usbhs_pipe_free(pipe);
 641
 642         uep->pipe->mod_private  = NULL;
 643         uep->pipe               = NULL;
 644
 645 out:
 646         spin_unlock_irqrestore(&uep->lock, flags);
 647
 648         return 0;
 649 }
 650
 651 static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
 652                                                    gfp_t gfp_flags)
 653 {
 654         struct usbhsg_request *ureq;
 655
 656         ureq = kzalloc(sizeof *ureq, gfp_flags);
 657         if (!ureq)
 658                 return NULL;
 659
 660         usbhs_pkt_init(usbhsg_ureq_to_pkt(ureq));
 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;
 698         unsigned long flags;
 699
 700         spin_lock_irqsave(&uep->lock, flags);
 701         pipe = usbhsg_uep_to_pipe(uep);
 702         if (pipe)
 703                 usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
 704
 705         /*
 706          * To dequeue a request, this driver should call the usbhsg_queue_pop()
 707          * even if the pipe is NULL.
 708          */
 709         usbhsg_queue_pop(uep, ureq, -ECONNRESET);
 710         spin_unlock_irqrestore(&uep->lock, flags);
 711
 712         return 0;
 713 }
 714
 715 static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
 716 {
 717         struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 718         struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 719         struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 720         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 721         struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 722         unsigned long flags;
 723
 724         usbhsg_pipe_disable(uep);
 725
 726         dev_dbg(dev, "set halt %d (pipe %d)\n",
 727                 halt, usbhs_pipe_number(pipe));
 728
 729         /********************  spin lock ********************/
 730         usbhs_lock(priv, flags);
 731
 732         if (halt)
 733                 usbhs_pipe_stall(pipe);
 734         else
 735                 usbhs_pipe_disable(pipe);
 736
 737         if (halt && wedge)
 738                 usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
 739         else
 740                 usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
 741
 742         usbhs_unlock(priv, flags);
 743         /********************  spin unlock ******************/
 744
 745         return 0;
 746 }
 747
 748 static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
 749 {
 750         return __usbhsg_ep_set_halt_wedge(ep, value, 0);
 751 }
 752
 753 static int usbhsg_ep_set_wedge(struct usb_ep *ep)
 754 {
 755         return __usbhsg_ep_set_halt_wedge(ep, 1, 1);
 756 }
 757
 758 static const struct usb_ep_ops usbhsg_ep_ops = {
 759         .enable         = usbhsg_ep_enable,
 760         .disable        = usbhsg_ep_disable,
 761
 762         .alloc_request  = usbhsg_ep_alloc_request,
 763         .free_request   = usbhsg_ep_free_request,
 764
 765         .queue          = usbhsg_ep_queue,
 766         .dequeue        = usbhsg_ep_dequeue,
 767
 768         .set_halt       = usbhsg_ep_set_halt,
 769         .set_wedge      = usbhsg_ep_set_wedge,
 770 };
 771
 772 /*
 773  *              pullup control
 774  */
 775 static int usbhsg_can_pullup(struct usbhs_priv *priv)
 776 {
 777         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 778
 779         return gpriv->driver &&
 780                usbhsg_status_has(gpriv, USBHSG_STATUS_SOFT_CONNECT);
 781 }
 782
 783 static void usbhsg_update_pullup(struct usbhs_priv *priv)
 784 {
 785         if (usbhsg_can_pullup(priv))
 786                 usbhs_sys_function_pullup(priv, 1);
 787         else
 788                 usbhs_sys_function_pullup(priv, 0);
 789 }
 790
 791 /*
 792  *              usb module start/end
 793  */
 794 static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
 795 {
 796         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 797         struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 798         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 799         struct device *dev = usbhs_priv_to_dev(priv);
 800         unsigned long flags;
 801         int ret = 0;
 802
 803         /********************  spin lock ********************/
 804         usbhs_lock(priv, flags);
 805
 806         usbhsg_status_set(gpriv, status);
 807         if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 808               usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
 809                 ret = -1; /* not ready */
 810
 811         usbhs_unlock(priv, flags);
 812         /********************  spin unlock ********************/
 813
 814         if (ret < 0)
 815                 return 0; /* not ready is not error */
 816
 817         /*
 818          * enable interrupt and systems if ready
 819          */
 820         dev_dbg(dev, "start gadget\n");
 821
 822         /*
 823          * pipe initialize and enable DCP
 824          */
 825         usbhs_fifo_init(priv);
 826         usbhs_pipe_init(priv,
 827                         usbhsg_dma_map_ctrl);
 828
 829         /* dcp init instead of usbhsg_ep_enable() */
 830         dcp->pipe               = usbhs_dcp_malloc(priv);
 831         dcp->pipe->mod_private  = dcp;
 832         usbhs_pipe_config_update(dcp->pipe, 0, 0, 64);
 833
 834         /*
 835          * system config enble
 836          * - HI speed
 837          * - function
 838          * - usb module
 839          */
 840         usbhs_sys_function_ctrl(priv, 1);
 841         usbhsg_update_pullup(priv);
 842
 843         /*
 844          * enable irq callback
 845          */
 846         mod->irq_dev_state      = usbhsg_irq_dev_state;
 847         mod->irq_ctrl_stage     = usbhsg_irq_ctrl_stage;
 848         usbhs_irq_callback_update(priv, mod);
 849
 850         return 0;
 851 }
 852
 853 static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 854 {
 855         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 856         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 857         struct usbhsg_uep *uep;
 858         struct device *dev = usbhs_priv_to_dev(priv);
 859         unsigned long flags;
 860         int ret = 0, i;
 861
 862         /********************  spin lock ********************/
 863         usbhs_lock(priv, flags);
 864
 865         usbhsg_status_clr(gpriv, status);
 866         if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 867             !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
 868                 ret = -1; /* already done */
 869
 870         usbhs_unlock(priv, flags);
 871         /********************  spin unlock ********************/
 872
 873         if (ret < 0)
 874                 return 0; /* already done is not error */
 875
 876         /*
 877          * disable interrupt and systems if 1st try
 878          */
 879         usbhs_fifo_quit(priv);
 880
 881         /* disable all irq */
 882         mod->irq_dev_state      = NULL;
 883         mod->irq_ctrl_stage     = NULL;
 884         usbhs_irq_callback_update(priv, mod);
 885
 886         gpriv->gadget.speed = USB_SPEED_UNKNOWN;
 887
 888         /* disable sys */
 889         usbhs_sys_set_test_mode(priv, 0);
 890         usbhs_sys_function_ctrl(priv, 0);
 891
 892         /* disable all eps */
 893         usbhsg_for_each_uep_with_dcp(uep, gpriv, i)
 894                 usbhsg_ep_disable(&uep->ep);
 895
 896         dev_dbg(dev, "stop gadget\n");
 897
 898         return 0;
 899 }
 900
 901 /*
 902  * VBUS provided by the PHY
 903  */
 904 static int usbhsm_phy_get_vbus(struct platform_device *pdev)
 905 {
 906         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
 907         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
 908
 909         return  gpriv->vbus_active;
 910 }
 911
 912 static void usbhs_mod_phy_mode(struct usbhs_priv *priv)
 913 {
 914         struct usbhs_mod_info *info = &priv->mod_info;
 915
 916         info->irq_vbus          = NULL;
 917         priv->pfunc.get_vbus    = usbhsm_phy_get_vbus;
 918
 919         usbhs_irq_callback_update(priv, NULL);
 920 }
 921
 922 /*
 923  *
 924  *              linux usb function
 925  *
 926  */
 927 static int usbhsg_gadget_start(struct usb_gadget *gadget,
 928                 struct usb_gadget_driver *driver)
 929 {
 930         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 931         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 932         struct device *dev = usbhs_priv_to_dev(priv);
 933         int ret;
 934
 935         if (!driver             ||
 936             !driver->setup      ||
 937             driver->max_speed < USB_SPEED_FULL)
 938                 return -EINVAL;
 939
 940         /* connect to bus through transceiver */
 941         if (!IS_ERR_OR_NULL(gpriv->transceiver)) {
 942                 ret = otg_set_peripheral(gpriv->transceiver->otg,
 943                                         &gpriv->gadget);
 944                 if (ret) {
 945                         dev_err(dev, "%s: can't bind to transceiver\n",
 946                                 gpriv->gadget.name);
 947                         return ret;
 948                 }
 949
 950                 /* get vbus using phy versions */
 951                 usbhs_mod_phy_mode(priv);
 952         }
 953
 954         /* first hook up the driver ... */
 955         gpriv->driver = driver;
 956
 957         return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
 958 }
 959
 960 static int usbhsg_gadget_stop(struct usb_gadget *gadget)
 961 {
 962         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 963         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 964
 965         usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
 966
 967         if (!IS_ERR_OR_NULL(gpriv->transceiver))
 968                 otg_set_peripheral(gpriv->transceiver->otg, NULL);
 969
 970         gpriv->driver = NULL;
 971
 972         return 0;
 973 }
 974
 975 /*
 976  *              usb gadget ops
 977  */
 978 static int usbhsg_get_frame(struct usb_gadget *gadget)
 979 {
 980         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 981         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 982
 983         return usbhs_frame_get_num(priv);
 984 }
 985
 986 static int usbhsg_pullup(struct usb_gadget *gadget, int is_on)
 987 {
 988         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
 989         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 990         unsigned long flags;
 991
 992         usbhs_lock(priv, flags);
 993         if (is_on)
 994                 usbhsg_status_set(gpriv, USBHSG_STATUS_SOFT_CONNECT);
 995         else
 996                 usbhsg_status_clr(gpriv, USBHSG_STATUS_SOFT_CONNECT);
 997         usbhsg_update_pullup(priv);
 998         usbhs_unlock(priv, flags);
 999
1000         return 0;
1001 }
1002
1003 static int usbhsg_set_selfpowered(struct usb_gadget *gadget, int is_self)
1004 {
1005         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
1006
1007         if (is_self)
1008                 usbhsg_status_set(gpriv, USBHSG_STATUS_SELF_POWERED);
1009         else
1010                 usbhsg_status_clr(gpriv, USBHSG_STATUS_SELF_POWERED);
1011
1012         gadget->is_selfpowered = (is_self != 0);
1013
1014         return 0;
1015 }
1016
1017 static int usbhsg_vbus_session(struct usb_gadget *gadget, int is_active)
1018 {
1019         struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
1020         struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
1021         struct platform_device *pdev = usbhs_priv_to_pdev(priv);
1022
1023         gpriv->vbus_active = !!is_active;
1024
1025         renesas_usbhs_call_notify_hotplug(pdev);
1026
1027         return 0;
1028 }
1029
1030 static const struct usb_gadget_ops usbhsg_gadget_ops = {
1031         .get_frame              = usbhsg_get_frame,
1032         .set_selfpowered        = usbhsg_set_selfpowered,
1033         .udc_start              = usbhsg_gadget_start,
1034         .udc_stop               = usbhsg_gadget_stop,
1035         .pullup                 = usbhsg_pullup,
1036         .vbus_session           = usbhsg_vbus_session,
1037 };
1038
1039 static int usbhsg_start(struct usbhs_priv *priv)
1040 {
1041         return usbhsg_try_start(priv, USBHSG_STATUS_STARTED);
1042 }
1043
1044 static int usbhsg_stop(struct usbhs_priv *priv)
1045 {
1046         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1047
1048         /* cable disconnect */
1049         if (gpriv->driver &&
1050             gpriv->driver->disconnect)
1051                 gpriv->driver->disconnect(&gpriv->gadget);
1052
1053         return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED);
1054 }
1055
1056 int usbhs_mod_gadget_probe(struct usbhs_priv *priv)
1057 {
1058         struct usbhsg_gpriv *gpriv;
1059         struct usbhsg_uep *uep;
1060         struct device *dev = usbhs_priv_to_dev(priv);
1061         struct renesas_usbhs_driver_pipe_config *pipe_configs =
1062                                         usbhs_get_dparam(priv, pipe_configs);
1063         int pipe_size = usbhs_get_dparam(priv, pipe_size);
1064         int i;
1065         int ret;
1066
1067         gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
1068         if (!gpriv)
1069                 return -ENOMEM;
1070
1071         uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
1072         if (!uep) {
1073                 ret = -ENOMEM;
1074                 goto usbhs_mod_gadget_probe_err_gpriv;
1075         }
1076
1077         gpriv->transceiver = usb_get_phy(USB_PHY_TYPE_UNDEFINED);
1078         dev_info(dev, "%stransceiver found\n",
1079                  !IS_ERR(gpriv->transceiver) ? "" : "no ");
1080
1081         /*
1082          * CAUTION
1083          *
1084          * There is no guarantee that it is possible to access usb module here.
1085          * Don't accesses to it.
1086          * The accesse will be enable after "usbhsg_start"
1087          */
1088
1089         /*
1090          * register itself
1091          */
1092         usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET);
1093
1094         /* init gpriv */
1095         gpriv->mod.name         = "gadget";
1096         gpriv->mod.start        = usbhsg_start;
1097         gpriv->mod.stop         = usbhsg_stop;
1098         gpriv->uep              = uep;
1099         gpriv->uep_size         = pipe_size;
1100         usbhsg_status_init(gpriv);
1101
1102         /*
1103          * init gadget
1104          */
1105         gpriv->gadget.dev.parent        = dev;
1106         gpriv->gadget.name              = "renesas_usbhs_udc";
1107         gpriv->gadget.ops               = &usbhsg_gadget_ops;
1108         gpriv->gadget.max_speed         = USB_SPEED_HIGH;
1109         gpriv->gadget.quirk_avoids_skb_reserve = usbhs_get_dparam(priv,
1110                                                                 has_usb_dmac);
1111
1112         INIT_LIST_HEAD(&gpriv->gadget.ep_list);
1113
1114         /*
1115          * init usb_ep
1116          */
1117         usbhsg_for_each_uep_with_dcp(uep, gpriv, i) {
1118                 uep->gpriv      = gpriv;
1119                 uep->pipe       = NULL;
1120                 snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i);
1121
1122                 uep->ep.name            = uep->ep_name;
1123                 uep->ep.ops             = &usbhsg_ep_ops;
1124                 INIT_LIST_HEAD(&uep->ep.ep_list);
1125                 spin_lock_init(&uep->lock);
1126
1127                 /* init DCP */
1128                 if (usbhsg_is_dcp(uep)) {
1129                         gpriv->gadget.ep0 = &uep->ep;
1130                         usb_ep_set_maxpacket_limit(&uep->ep, 64);
1131                         uep->ep.caps.type_control = true;
1132                 } else {
1133                         /* init normal pipe */
1134                         if (pipe_configs[i].type == USB_ENDPOINT_XFER_ISOC)
1135                                 uep->ep.caps.type_iso = true;
1136                         if (pipe_configs[i].type == USB_ENDPOINT_XFER_BULK)
1137                                 uep->ep.caps.type_bulk = true;
1138                         if (pipe_configs[i].type == USB_ENDPOINT_XFER_INT)
1139                                 uep->ep.caps.type_int = true;
1140                         usb_ep_set_maxpacket_limit(&uep->ep,
1141                                                    pipe_configs[i].bufsize);
1142                         list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
1143                 }
1144                 uep->ep.caps.dir_in = true;
1145                 uep->ep.caps.dir_out = true;
1146         }
1147
1148         ret = usb_add_gadget_udc(dev, &gpriv->gadget);
1149         if (ret)
1150                 goto err_add_udc;
1151
1152
1153         dev_info(dev, "gadget probed\n");
1154
1155         return 0;
1156
1157 err_add_udc:
1158         kfree(gpriv->uep);
1159
1160 usbhs_mod_gadget_probe_err_gpriv:
1161         kfree(gpriv);
1162
1163         return ret;
1164 }
1165
1166 void usbhs_mod_gadget_remove(struct usbhs_priv *priv)
1167 {
1168         struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
1169
1170         usb_del_gadget_udc(&gpriv->gadget);
1171
1172         kfree(gpriv->uep);
1173         kfree(gpriv);
1174 }