linux/drivers/usb/gadget/fotg210-udc.c
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   1/*
   2 * FOTG210 UDC Driver supports Bulk transfer so far
   3 *
   4 * Copyright (C) 2013 Faraday Technology Corporation
   5 *
   6 * Author : Yuan-Hsin Chen <yhchen@faraday-tech.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; version 2 of the License.
  11 */
  12
  13#include <linux/dma-mapping.h>
  14#include <linux/err.h>
  15#include <linux/interrupt.h>
  16#include <linux/io.h>
  17#include <linux/module.h>
  18#include <linux/platform_device.h>
  19#include <linux/usb/ch9.h>
  20#include <linux/usb/gadget.h>
  21
  22#include "fotg210.h"
  23
  24#define DRIVER_DESC     "FOTG210 USB Device Controller Driver"
  25#define DRIVER_VERSION  "30-April-2013"
  26
  27static const char udc_name[] = "fotg210_udc";
  28static const char * const fotg210_ep_name[] = {
  29        "ep0", "ep1", "ep2", "ep3", "ep4"};
  30
  31static void fotg210_disable_fifo_int(struct fotg210_ep *ep)
  32{
  33        u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR1);
  34
  35        if (ep->dir_in)
  36                value |= DMISGR1_MF_IN_INT(ep->epnum - 1);
  37        else
  38                value |= DMISGR1_MF_OUTSPK_INT(ep->epnum - 1);
  39        iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR1);
  40}
  41
  42static void fotg210_enable_fifo_int(struct fotg210_ep *ep)
  43{
  44        u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR1);
  45
  46        if (ep->dir_in)
  47                value &= ~DMISGR1_MF_IN_INT(ep->epnum - 1);
  48        else
  49                value &= ~DMISGR1_MF_OUTSPK_INT(ep->epnum - 1);
  50        iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR1);
  51}
  52
  53static void fotg210_set_cxdone(struct fotg210_udc *fotg210)
  54{
  55        u32 value = ioread32(fotg210->reg + FOTG210_DCFESR);
  56
  57        value |= DCFESR_CX_DONE;
  58        iowrite32(value, fotg210->reg + FOTG210_DCFESR);
  59}
  60
  61static void fotg210_done(struct fotg210_ep *ep, struct fotg210_request *req,
  62                        int status)
  63{
  64        list_del_init(&req->queue);
  65
  66        /* don't modify queue heads during completion callback */
  67        if (ep->fotg210->gadget.speed == USB_SPEED_UNKNOWN)
  68                req->req.status = -ESHUTDOWN;
  69        else
  70                req->req.status = status;
  71
  72        spin_unlock(&ep->fotg210->lock);
  73        req->req.complete(&ep->ep, &req->req);
  74        spin_lock(&ep->fotg210->lock);
  75
  76        if (ep->epnum) {
  77                if (list_empty(&ep->queue))
  78                        fotg210_disable_fifo_int(ep);
  79        } else {
  80                fotg210_set_cxdone(ep->fotg210);
  81        }
  82}
  83
  84static void fotg210_fifo_ep_mapping(struct fotg210_ep *ep, u32 epnum,
  85                                u32 dir_in)
  86{
  87        struct fotg210_udc *fotg210 = ep->fotg210;
  88        u32 val;
  89
  90        /* Driver should map an ep to a fifo and then map the fifo
  91         * to the ep. What a brain-damaged design!
  92         */
  93
  94        /* map a fifo to an ep */
  95        val = ioread32(fotg210->reg + FOTG210_EPMAP);
  96        val &= ~EPMAP_FIFONOMSK(epnum, dir_in);
  97        val |= EPMAP_FIFONO(epnum, dir_in);
  98        iowrite32(val, fotg210->reg + FOTG210_EPMAP);
  99
 100        /* map the ep to the fifo */
 101        val = ioread32(fotg210->reg + FOTG210_FIFOMAP);
 102        val &= ~FIFOMAP_EPNOMSK(epnum);
 103        val |= FIFOMAP_EPNO(epnum);
 104        iowrite32(val, fotg210->reg + FOTG210_FIFOMAP);
 105
 106        /* enable fifo */
 107        val = ioread32(fotg210->reg + FOTG210_FIFOCF);
 108        val |= FIFOCF_FIFO_EN(epnum - 1);
 109        iowrite32(val, fotg210->reg + FOTG210_FIFOCF);
 110}
 111
 112static void fotg210_set_fifo_dir(struct fotg210_ep *ep, u32 epnum, u32 dir_in)
 113{
 114        struct fotg210_udc *fotg210 = ep->fotg210;
 115        u32 val;
 116
 117        val = ioread32(fotg210->reg + FOTG210_FIFOMAP);
 118        val |= (dir_in ? FIFOMAP_DIRIN(epnum - 1) : FIFOMAP_DIROUT(epnum - 1));
 119        iowrite32(val, fotg210->reg + FOTG210_FIFOMAP);
 120}
 121
 122static void fotg210_set_tfrtype(struct fotg210_ep *ep, u32 epnum, u32 type)
 123{
 124        struct fotg210_udc *fotg210 = ep->fotg210;
 125        u32 val;
 126
 127        val = ioread32(fotg210->reg + FOTG210_FIFOCF);
 128        val |= FIFOCF_TYPE(type, epnum - 1);
 129        iowrite32(val, fotg210->reg + FOTG210_FIFOCF);
 130}
 131
 132static void fotg210_set_mps(struct fotg210_ep *ep, u32 epnum, u32 mps,
 133                                u32 dir_in)
 134{
 135        struct fotg210_udc *fotg210 = ep->fotg210;
 136        u32 val;
 137        u32 offset = dir_in ? FOTG210_INEPMPSR(epnum) :
 138                                FOTG210_OUTEPMPSR(epnum);
 139
 140        val = ioread32(fotg210->reg + offset);
 141        val |= INOUTEPMPSR_MPS(mps);
 142        iowrite32(val, fotg210->reg + offset);
 143}
 144
 145static int fotg210_config_ep(struct fotg210_ep *ep,
 146                     const struct usb_endpoint_descriptor *desc)
 147{
 148        struct fotg210_udc *fotg210 = ep->fotg210;
 149
 150        fotg210_set_fifo_dir(ep, ep->epnum, ep->dir_in);
 151        fotg210_set_tfrtype(ep, ep->epnum, ep->type);
 152        fotg210_set_mps(ep, ep->epnum, ep->ep.maxpacket, ep->dir_in);
 153        fotg210_fifo_ep_mapping(ep, ep->epnum, ep->dir_in);
 154
 155        fotg210->ep[ep->epnum] = ep;
 156
 157        return 0;
 158}
 159
 160static int fotg210_ep_enable(struct usb_ep *_ep,
 161                          const struct usb_endpoint_descriptor *desc)
 162{
 163        struct fotg210_ep *ep;
 164
 165        ep = container_of(_ep, struct fotg210_ep, ep);
 166
 167        ep->desc = desc;
 168        ep->epnum = usb_endpoint_num(desc);
 169        ep->type = usb_endpoint_type(desc);
 170        ep->dir_in = usb_endpoint_dir_in(desc);
 171        ep->ep.maxpacket = usb_endpoint_maxp(desc);
 172
 173        return fotg210_config_ep(ep, desc);
 174}
 175
 176static void fotg210_reset_tseq(struct fotg210_udc *fotg210, u8 epnum)
 177{
 178        struct fotg210_ep *ep = fotg210->ep[epnum];
 179        u32 value;
 180        void __iomem *reg;
 181
 182        reg = (ep->dir_in) ?
 183                fotg210->reg + FOTG210_INEPMPSR(epnum) :
 184                fotg210->reg + FOTG210_OUTEPMPSR(epnum);
 185
 186        /* Note: Driver needs to set and clear INOUTEPMPSR_RESET_TSEQ
 187         *       bit. Controller wouldn't clear this bit. WTF!!!
 188         */
 189
 190        value = ioread32(reg);
 191        value |= INOUTEPMPSR_RESET_TSEQ;
 192        iowrite32(value, reg);
 193
 194        value = ioread32(reg);
 195        value &= ~INOUTEPMPSR_RESET_TSEQ;
 196        iowrite32(value, reg);
 197}
 198
 199static int fotg210_ep_release(struct fotg210_ep *ep)
 200{
 201        if (!ep->epnum)
 202                return 0;
 203        ep->epnum = 0;
 204        ep->stall = 0;
 205        ep->wedged = 0;
 206
 207        fotg210_reset_tseq(ep->fotg210, ep->epnum);
 208
 209        return 0;
 210}
 211
 212static int fotg210_ep_disable(struct usb_ep *_ep)
 213{
 214        struct fotg210_ep *ep;
 215        struct fotg210_request *req;
 216        unsigned long flags;
 217
 218        BUG_ON(!_ep);
 219
 220        ep = container_of(_ep, struct fotg210_ep, ep);
 221
 222        while (!list_empty(&ep->queue)) {
 223                req = list_entry(ep->queue.next,
 224                        struct fotg210_request, queue);
 225                spin_lock_irqsave(&ep->fotg210->lock, flags);
 226                fotg210_done(ep, req, -ECONNRESET);
 227                spin_unlock_irqrestore(&ep->fotg210->lock, flags);
 228        }
 229
 230        return fotg210_ep_release(ep);
 231}
 232
 233static struct usb_request *fotg210_ep_alloc_request(struct usb_ep *_ep,
 234                                                gfp_t gfp_flags)
 235{
 236        struct fotg210_request *req;
 237
 238        req = kzalloc(sizeof(struct fotg210_request), gfp_flags);
 239        if (!req)
 240                return NULL;
 241
 242        INIT_LIST_HEAD(&req->queue);
 243
 244        return &req->req;
 245}
 246
 247static void fotg210_ep_free_request(struct usb_ep *_ep,
 248                                        struct usb_request *_req)
 249{
 250        struct fotg210_request *req;
 251
 252        req = container_of(_req, struct fotg210_request, req);
 253        kfree(req);
 254}
 255
 256static void fotg210_enable_dma(struct fotg210_ep *ep,
 257                              dma_addr_t d, u32 len)
 258{
 259        u32 value;
 260        struct fotg210_udc *fotg210 = ep->fotg210;
 261
 262        /* set transfer length and direction */
 263        value = ioread32(fotg210->reg + FOTG210_DMACPSR1);
 264        value &= ~(DMACPSR1_DMA_LEN(0xFFFF) | DMACPSR1_DMA_TYPE(1));
 265        value |= DMACPSR1_DMA_LEN(len) | DMACPSR1_DMA_TYPE(ep->dir_in);
 266        iowrite32(value, fotg210->reg + FOTG210_DMACPSR1);
 267
 268        /* set device DMA target FIFO number */
 269        value = ioread32(fotg210->reg + FOTG210_DMATFNR);
 270        if (ep->epnum)
 271                value |= DMATFNR_ACC_FN(ep->epnum - 1);
 272        else
 273                value |= DMATFNR_ACC_CXF;
 274        iowrite32(value, fotg210->reg + FOTG210_DMATFNR);
 275
 276        /* set DMA memory address */
 277        iowrite32(d, fotg210->reg + FOTG210_DMACPSR2);
 278
 279        /* enable MDMA_EROR and MDMA_CMPLT interrupt */
 280        value = ioread32(fotg210->reg + FOTG210_DMISGR2);
 281        value &= ~(DMISGR2_MDMA_CMPLT | DMISGR2_MDMA_ERROR);
 282        iowrite32(value, fotg210->reg + FOTG210_DMISGR2);
 283
 284        /* start DMA */
 285        value = ioread32(fotg210->reg + FOTG210_DMACPSR1);
 286        value |= DMACPSR1_DMA_START;
 287        iowrite32(value, fotg210->reg + FOTG210_DMACPSR1);
 288}
 289
 290static void fotg210_disable_dma(struct fotg210_ep *ep)
 291{
 292        iowrite32(DMATFNR_DISDMA, ep->fotg210->reg + FOTG210_DMATFNR);
 293}
 294
 295static void fotg210_wait_dma_done(struct fotg210_ep *ep)
 296{
 297        u32 value;
 298
 299        do {
 300                value = ioread32(ep->fotg210->reg + FOTG210_DISGR2);
 301                if ((value & DISGR2_USBRST_INT) ||
 302                    (value & DISGR2_DMA_ERROR))
 303                        goto dma_reset;
 304        } while (!(value & DISGR2_DMA_CMPLT));
 305
 306        value &= ~DISGR2_DMA_CMPLT;
 307        iowrite32(value, ep->fotg210->reg + FOTG210_DISGR2);
 308        return;
 309
 310dma_reset:
 311        value = ioread32(ep->fotg210->reg + FOTG210_DMACPSR1);
 312        value |= DMACPSR1_DMA_ABORT;
 313        iowrite32(value, ep->fotg210->reg + FOTG210_DMACPSR1);
 314
 315        /* reset fifo */
 316        if (ep->epnum) {
 317                value = ioread32(ep->fotg210->reg +
 318                                FOTG210_FIBCR(ep->epnum - 1));
 319                value |= FIBCR_FFRST;
 320                iowrite32(value, ep->fotg210->reg +
 321                                FOTG210_FIBCR(ep->epnum - 1));
 322        } else {
 323                value = ioread32(ep->fotg210->reg + FOTG210_DCFESR);
 324                value |= DCFESR_CX_CLR;
 325                iowrite32(value, ep->fotg210->reg + FOTG210_DCFESR);
 326        }
 327}
 328
 329static void fotg210_start_dma(struct fotg210_ep *ep,
 330                        struct fotg210_request *req)
 331{
 332        dma_addr_t d;
 333        u8 *buffer;
 334        u32 length;
 335
 336        if (ep->epnum) {
 337                if (ep->dir_in) {
 338                        buffer = req->req.buf;
 339                        length = req->req.length;
 340                } else {
 341                        buffer = req->req.buf + req->req.actual;
 342                        length = ioread32(ep->fotg210->reg +
 343                                        FOTG210_FIBCR(ep->epnum - 1));
 344                        length &= FIBCR_BCFX;
 345                }
 346        } else {
 347                buffer = req->req.buf + req->req.actual;
 348                if (req->req.length - req->req.actual > ep->ep.maxpacket)
 349                        length = ep->ep.maxpacket;
 350                else
 351                        length = req->req.length;
 352        }
 353
 354        d = dma_map_single(NULL, buffer, length,
 355                        ep->dir_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 356
 357        if (dma_mapping_error(NULL, d)) {
 358                pr_err("dma_mapping_error\n");
 359                return;
 360        }
 361
 362        dma_sync_single_for_device(NULL, d, length,
 363                                   ep->dir_in ? DMA_TO_DEVICE :
 364                                        DMA_FROM_DEVICE);
 365
 366        fotg210_enable_dma(ep, d, length);
 367
 368        /* check if dma is done */
 369        fotg210_wait_dma_done(ep);
 370
 371        fotg210_disable_dma(ep);
 372
 373        /* update actual transfer length */
 374        req->req.actual += length;
 375
 376        dma_unmap_single(NULL, d, length, DMA_TO_DEVICE);
 377}
 378
 379static void fotg210_ep0_queue(struct fotg210_ep *ep,
 380                                struct fotg210_request *req)
 381{
 382        if (!req->req.length) {
 383                fotg210_done(ep, req, 0);
 384                return;
 385        }
 386        if (ep->dir_in) { /* if IN */
 387                if (req->req.length) {
 388                        fotg210_start_dma(ep, req);
 389                } else {
 390                        pr_err("%s : req->req.length = 0x%x\n",
 391                               __func__, req->req.length);
 392                }
 393                if ((req->req.length == req->req.actual) ||
 394                    (req->req.actual < ep->ep.maxpacket))
 395                        fotg210_done(ep, req, 0);
 396        } else { /* OUT */
 397                if (!req->req.length) {
 398                        fotg210_done(ep, req, 0);
 399                } else {
 400                        u32 value = ioread32(ep->fotg210->reg +
 401                                                FOTG210_DMISGR0);
 402
 403                        value &= ~DMISGR0_MCX_OUT_INT;
 404                        iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR0);
 405                }
 406        }
 407}
 408
 409static int fotg210_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
 410                                gfp_t gfp_flags)
 411{
 412        struct fotg210_ep *ep;
 413        struct fotg210_request *req;
 414        unsigned long flags;
 415        int request = 0;
 416
 417        ep = container_of(_ep, struct fotg210_ep, ep);
 418        req = container_of(_req, struct fotg210_request, req);
 419
 420        if (ep->fotg210->gadget.speed == USB_SPEED_UNKNOWN)
 421                return -ESHUTDOWN;
 422
 423        spin_lock_irqsave(&ep->fotg210->lock, flags);
 424
 425        if (list_empty(&ep->queue))
 426                request = 1;
 427
 428        list_add_tail(&req->queue, &ep->queue);
 429
 430        req->req.actual = 0;
 431        req->req.status = -EINPROGRESS;
 432
 433        if (!ep->epnum) /* ep0 */
 434                fotg210_ep0_queue(ep, req);
 435        else if (request && !ep->stall)
 436                fotg210_enable_fifo_int(ep);
 437
 438        spin_unlock_irqrestore(&ep->fotg210->lock, flags);
 439
 440        return 0;
 441}
 442
 443static int fotg210_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 444{
 445        struct fotg210_ep *ep;
 446        struct fotg210_request *req;
 447        unsigned long flags;
 448
 449        ep = container_of(_ep, struct fotg210_ep, ep);
 450        req = container_of(_req, struct fotg210_request, req);
 451
 452        spin_lock_irqsave(&ep->fotg210->lock, flags);
 453        if (!list_empty(&ep->queue))
 454                fotg210_done(ep, req, -ECONNRESET);
 455        spin_unlock_irqrestore(&ep->fotg210->lock, flags);
 456
 457        return 0;
 458}
 459
 460static void fotg210_set_epnstall(struct fotg210_ep *ep)
 461{
 462        struct fotg210_udc *fotg210 = ep->fotg210;
 463        u32 value;
 464        void __iomem *reg;
 465
 466        /* check if IN FIFO is empty before stall */
 467        if (ep->dir_in) {
 468                do {
 469                        value = ioread32(fotg210->reg + FOTG210_DCFESR);
 470                } while (!(value & DCFESR_FIFO_EMPTY(ep->epnum - 1)));
 471        }
 472
 473        reg = (ep->dir_in) ?
 474                fotg210->reg + FOTG210_INEPMPSR(ep->epnum) :
 475                fotg210->reg + FOTG210_OUTEPMPSR(ep->epnum);
 476        value = ioread32(reg);
 477        value |= INOUTEPMPSR_STL_EP;
 478        iowrite32(value, reg);
 479}
 480
 481static void fotg210_clear_epnstall(struct fotg210_ep *ep)
 482{
 483        struct fotg210_udc *fotg210 = ep->fotg210;
 484        u32 value;
 485        void __iomem *reg;
 486
 487        reg = (ep->dir_in) ?
 488                fotg210->reg + FOTG210_INEPMPSR(ep->epnum) :
 489                fotg210->reg + FOTG210_OUTEPMPSR(ep->epnum);
 490        value = ioread32(reg);
 491        value &= ~INOUTEPMPSR_STL_EP;
 492        iowrite32(value, reg);
 493}
 494
 495static int fotg210_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedge)
 496{
 497        struct fotg210_ep *ep;
 498        struct fotg210_udc *fotg210;
 499        unsigned long flags;
 500        int ret = 0;
 501
 502        ep = container_of(_ep, struct fotg210_ep, ep);
 503
 504        fotg210 = ep->fotg210;
 505
 506        spin_lock_irqsave(&ep->fotg210->lock, flags);
 507
 508        if (value) {
 509                fotg210_set_epnstall(ep);
 510                ep->stall = 1;
 511                if (wedge)
 512                        ep->wedged = 1;
 513        } else {
 514                fotg210_reset_tseq(fotg210, ep->epnum);
 515                fotg210_clear_epnstall(ep);
 516                ep->stall = 0;
 517                ep->wedged = 0;
 518                if (!list_empty(&ep->queue))
 519                        fotg210_enable_fifo_int(ep);
 520        }
 521
 522        spin_unlock_irqrestore(&ep->fotg210->lock, flags);
 523        return ret;
 524}
 525
 526static int fotg210_ep_set_halt(struct usb_ep *_ep, int value)
 527{
 528        return fotg210_set_halt_and_wedge(_ep, value, 0);
 529}
 530
 531static int fotg210_ep_set_wedge(struct usb_ep *_ep)
 532{
 533        return fotg210_set_halt_and_wedge(_ep, 1, 1);
 534}
 535
 536static void fotg210_ep_fifo_flush(struct usb_ep *_ep)
 537{
 538}
 539
 540static struct usb_ep_ops fotg210_ep_ops = {
 541        .enable         = fotg210_ep_enable,
 542        .disable        = fotg210_ep_disable,
 543
 544        .alloc_request  = fotg210_ep_alloc_request,
 545        .free_request   = fotg210_ep_free_request,
 546
 547        .queue          = fotg210_ep_queue,
 548        .dequeue        = fotg210_ep_dequeue,
 549
 550        .set_halt       = fotg210_ep_set_halt,
 551        .fifo_flush     = fotg210_ep_fifo_flush,
 552        .set_wedge      = fotg210_ep_set_wedge,
 553};
 554
 555static void fotg210_clear_tx0byte(struct fotg210_udc *fotg210)
 556{
 557        u32 value = ioread32(fotg210->reg + FOTG210_TX0BYTE);
 558
 559        value &= ~(TX0BYTE_EP1 | TX0BYTE_EP2 | TX0BYTE_EP3
 560                   | TX0BYTE_EP4);
 561        iowrite32(value, fotg210->reg + FOTG210_TX0BYTE);
 562}
 563
 564static void fotg210_clear_rx0byte(struct fotg210_udc *fotg210)
 565{
 566        u32 value = ioread32(fotg210->reg + FOTG210_RX0BYTE);
 567
 568        value &= ~(RX0BYTE_EP1 | RX0BYTE_EP2 | RX0BYTE_EP3
 569                   | RX0BYTE_EP4);
 570        iowrite32(value, fotg210->reg + FOTG210_RX0BYTE);
 571}
 572
 573/* read 8-byte setup packet only */
 574static void fotg210_rdsetupp(struct fotg210_udc *fotg210,
 575                   u8 *buffer)
 576{
 577        int i = 0;
 578        u8 *tmp = buffer;
 579        u32 data;
 580        u32 length = 8;
 581
 582        iowrite32(DMATFNR_ACC_CXF, fotg210->reg + FOTG210_DMATFNR);
 583
 584        for (i = (length >> 2); i > 0; i--) {
 585                data = ioread32(fotg210->reg + FOTG210_CXPORT);
 586                *tmp = data & 0xFF;
 587                *(tmp + 1) = (data >> 8) & 0xFF;
 588                *(tmp + 2) = (data >> 16) & 0xFF;
 589                *(tmp + 3) = (data >> 24) & 0xFF;
 590                tmp = tmp + 4;
 591        }
 592
 593        switch (length % 4) {
 594        case 1:
 595                data = ioread32(fotg210->reg + FOTG210_CXPORT);
 596                *tmp = data & 0xFF;
 597                break;
 598        case 2:
 599                data = ioread32(fotg210->reg + FOTG210_CXPORT);
 600                *tmp = data & 0xFF;
 601                *(tmp + 1) = (data >> 8) & 0xFF;
 602                break;
 603        case 3:
 604                data = ioread32(fotg210->reg + FOTG210_CXPORT);
 605                *tmp = data & 0xFF;
 606                *(tmp + 1) = (data >> 8) & 0xFF;
 607                *(tmp + 2) = (data >> 16) & 0xFF;
 608                break;
 609        default:
 610                break;
 611        }
 612
 613        iowrite32(DMATFNR_DISDMA, fotg210->reg + FOTG210_DMATFNR);
 614}
 615
 616static void fotg210_set_configuration(struct fotg210_udc *fotg210)
 617{
 618        u32 value = ioread32(fotg210->reg + FOTG210_DAR);
 619
 620        value |= DAR_AFT_CONF;
 621        iowrite32(value, fotg210->reg + FOTG210_DAR);
 622}
 623
 624static void fotg210_set_dev_addr(struct fotg210_udc *fotg210, u32 addr)
 625{
 626        u32 value = ioread32(fotg210->reg + FOTG210_DAR);
 627
 628        value |= (addr & 0x7F);
 629        iowrite32(value, fotg210->reg + FOTG210_DAR);
 630}
 631
 632static void fotg210_set_cxstall(struct fotg210_udc *fotg210)
 633{
 634        u32 value = ioread32(fotg210->reg + FOTG210_DCFESR);
 635
 636        value |= DCFESR_CX_STL;
 637        iowrite32(value, fotg210->reg + FOTG210_DCFESR);
 638}
 639
 640static void fotg210_request_error(struct fotg210_udc *fotg210)
 641{
 642        fotg210_set_cxstall(fotg210);
 643        pr_err("request error!!\n");
 644}
 645
 646static void fotg210_set_address(struct fotg210_udc *fotg210,
 647                                struct usb_ctrlrequest *ctrl)
 648{
 649        if (ctrl->wValue >= 0x0100) {
 650                fotg210_request_error(fotg210);
 651        } else {
 652                fotg210_set_dev_addr(fotg210, ctrl->wValue);
 653                fotg210_set_cxdone(fotg210);
 654        }
 655}
 656
 657static void fotg210_set_feature(struct fotg210_udc *fotg210,
 658                                struct usb_ctrlrequest *ctrl)
 659{
 660        switch (ctrl->bRequestType & USB_RECIP_MASK) {
 661        case USB_RECIP_DEVICE:
 662                fotg210_set_cxdone(fotg210);
 663                break;
 664        case USB_RECIP_INTERFACE:
 665                fotg210_set_cxdone(fotg210);
 666                break;
 667        case USB_RECIP_ENDPOINT: {
 668                u8 epnum;
 669                epnum = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
 670                if (epnum)
 671                        fotg210_set_epnstall(fotg210->ep[epnum]);
 672                else
 673                        fotg210_set_cxstall(fotg210);
 674                fotg210_set_cxdone(fotg210);
 675                }
 676                break;
 677        default:
 678                fotg210_request_error(fotg210);
 679                break;
 680        }
 681}
 682
 683static void fotg210_clear_feature(struct fotg210_udc *fotg210,
 684                                struct usb_ctrlrequest *ctrl)
 685{
 686        struct fotg210_ep *ep =
 687                fotg210->ep[ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK];
 688
 689        switch (ctrl->bRequestType & USB_RECIP_MASK) {
 690        case USB_RECIP_DEVICE:
 691                fotg210_set_cxdone(fotg210);
 692                break;
 693        case USB_RECIP_INTERFACE:
 694                fotg210_set_cxdone(fotg210);
 695                break;
 696        case USB_RECIP_ENDPOINT:
 697                if (ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK) {
 698                        if (ep->wedged) {
 699                                fotg210_set_cxdone(fotg210);
 700                                break;
 701                        }
 702                        if (ep->stall)
 703                                fotg210_set_halt_and_wedge(&ep->ep, 0, 0);
 704                }
 705                fotg210_set_cxdone(fotg210);
 706                break;
 707        default:
 708                fotg210_request_error(fotg210);
 709                break;
 710        }
 711}
 712
 713static int fotg210_is_epnstall(struct fotg210_ep *ep)
 714{
 715        struct fotg210_udc *fotg210 = ep->fotg210;
 716        u32 value;
 717        void __iomem *reg;
 718
 719        reg = (ep->dir_in) ?
 720                fotg210->reg + FOTG210_INEPMPSR(ep->epnum) :
 721                fotg210->reg + FOTG210_OUTEPMPSR(ep->epnum);
 722        value = ioread32(reg);
 723        return value & INOUTEPMPSR_STL_EP ? 1 : 0;
 724}
 725
 726static void fotg210_get_status(struct fotg210_udc *fotg210,
 727                                struct usb_ctrlrequest *ctrl)
 728{
 729        u8 epnum;
 730
 731        switch (ctrl->bRequestType & USB_RECIP_MASK) {
 732        case USB_RECIP_DEVICE:
 733                fotg210->ep0_data = 1 << USB_DEVICE_SELF_POWERED;
 734                break;
 735        case USB_RECIP_INTERFACE:
 736                fotg210->ep0_data = 0;
 737                break;
 738        case USB_RECIP_ENDPOINT:
 739                epnum = ctrl->wIndex & USB_ENDPOINT_NUMBER_MASK;
 740                if (epnum)
 741                        fotg210->ep0_data =
 742                                fotg210_is_epnstall(fotg210->ep[epnum])
 743                                << USB_ENDPOINT_HALT;
 744                else
 745                        fotg210_request_error(fotg210);
 746                break;
 747
 748        default:
 749                fotg210_request_error(fotg210);
 750                return;         /* exit */
 751        }
 752
 753        fotg210->ep0_req->buf = &fotg210->ep0_data;
 754        fotg210->ep0_req->length = 2;
 755
 756        spin_unlock(&fotg210->lock);
 757        fotg210_ep_queue(fotg210->gadget.ep0, fotg210->ep0_req, GFP_KERNEL);
 758        spin_lock(&fotg210->lock);
 759}
 760
 761static int fotg210_setup_packet(struct fotg210_udc *fotg210,
 762                                struct usb_ctrlrequest *ctrl)
 763{
 764        u8 *p = (u8 *)ctrl;
 765        u8 ret = 0;
 766
 767        fotg210_rdsetupp(fotg210, p);
 768
 769        fotg210->ep[0]->dir_in = ctrl->bRequestType & USB_DIR_IN;
 770
 771        if (fotg210->gadget.speed == USB_SPEED_UNKNOWN) {
 772                u32 value = ioread32(fotg210->reg + FOTG210_DMCR);
 773                fotg210->gadget.speed = value & DMCR_HS_EN ?
 774                                USB_SPEED_HIGH : USB_SPEED_FULL;
 775        }
 776
 777        /* check request */
 778        if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 779                switch (ctrl->bRequest) {
 780                case USB_REQ_GET_STATUS:
 781                        fotg210_get_status(fotg210, ctrl);
 782                        break;
 783                case USB_REQ_CLEAR_FEATURE:
 784                        fotg210_clear_feature(fotg210, ctrl);
 785                        break;
 786                case USB_REQ_SET_FEATURE:
 787                        fotg210_set_feature(fotg210, ctrl);
 788                        break;
 789                case USB_REQ_SET_ADDRESS:
 790                        fotg210_set_address(fotg210, ctrl);
 791                        break;
 792                case USB_REQ_SET_CONFIGURATION:
 793                        fotg210_set_configuration(fotg210);
 794                        ret = 1;
 795                        break;
 796                default:
 797                        ret = 1;
 798                        break;
 799                }
 800        } else {
 801                ret = 1;
 802        }
 803
 804        return ret;
 805}
 806
 807static void fotg210_ep0out(struct fotg210_udc *fotg210)
 808{
 809        struct fotg210_ep *ep = fotg210->ep[0];
 810
 811        if (!list_empty(&ep->queue) && !ep->dir_in) {
 812                struct fotg210_request *req;
 813
 814                req = list_first_entry(&ep->queue,
 815                        struct fotg210_request, queue);
 816
 817                if (req->req.length)
 818                        fotg210_start_dma(ep, req);
 819
 820                if ((req->req.length - req->req.actual) < ep->ep.maxpacket)
 821                        fotg210_done(ep, req, 0);
 822        } else {
 823                pr_err("%s : empty queue\n", __func__);
 824        }
 825}
 826
 827static void fotg210_ep0in(struct fotg210_udc *fotg210)
 828{
 829        struct fotg210_ep *ep = fotg210->ep[0];
 830
 831        if ((!list_empty(&ep->queue)) && (ep->dir_in)) {
 832                struct fotg210_request *req;
 833
 834                req = list_entry(ep->queue.next,
 835                                struct fotg210_request, queue);
 836
 837                if (req->req.length)
 838                        fotg210_start_dma(ep, req);
 839
 840                if ((req->req.length - req->req.actual) < ep->ep.maxpacket)
 841                        fotg210_done(ep, req, 0);
 842        } else {
 843                fotg210_set_cxdone(fotg210);
 844        }
 845}
 846
 847static void fotg210_clear_comabt_int(struct fotg210_udc *fotg210)
 848{
 849        u32 value = ioread32(fotg210->reg + FOTG210_DISGR0);
 850
 851        value &= ~DISGR0_CX_COMABT_INT;
 852        iowrite32(value, fotg210->reg + FOTG210_DISGR0);
 853}
 854
 855static void fotg210_in_fifo_handler(struct fotg210_ep *ep)
 856{
 857        struct fotg210_request *req = list_entry(ep->queue.next,
 858                                        struct fotg210_request, queue);
 859
 860        if (req->req.length)
 861                fotg210_start_dma(ep, req);
 862        fotg210_done(ep, req, 0);
 863}
 864
 865static void fotg210_out_fifo_handler(struct fotg210_ep *ep)
 866{
 867        struct fotg210_request *req = list_entry(ep->queue.next,
 868                                                 struct fotg210_request, queue);
 869
 870        fotg210_start_dma(ep, req);
 871
 872        /* finish out transfer */
 873        if (req->req.length == req->req.actual ||
 874            req->req.actual < ep->ep.maxpacket)
 875                fotg210_done(ep, req, 0);
 876}
 877
 878static irqreturn_t fotg210_irq(int irq, void *_fotg210)
 879{
 880        struct fotg210_udc *fotg210 = _fotg210;
 881        u32 int_grp = ioread32(fotg210->reg + FOTG210_DIGR);
 882        u32 int_msk = ioread32(fotg210->reg + FOTG210_DMIGR);
 883
 884        int_grp &= ~int_msk;
 885
 886        spin_lock(&fotg210->lock);
 887
 888        if (int_grp & DIGR_INT_G2) {
 889                void __iomem *reg = fotg210->reg + FOTG210_DISGR2;
 890                u32 int_grp2 = ioread32(reg);
 891                u32 int_msk2 = ioread32(fotg210->reg + FOTG210_DMISGR2);
 892                u32 value;
 893
 894                int_grp2 &= ~int_msk2;
 895
 896                if (int_grp2 & DISGR2_USBRST_INT) {
 897                        value = ioread32(reg);
 898                        value &= ~DISGR2_USBRST_INT;
 899                        iowrite32(value, reg);
 900                        pr_info("fotg210 udc reset\n");
 901                }
 902                if (int_grp2 & DISGR2_SUSP_INT) {
 903                        value = ioread32(reg);
 904                        value &= ~DISGR2_SUSP_INT;
 905                        iowrite32(value, reg);
 906                        pr_info("fotg210 udc suspend\n");
 907                }
 908                if (int_grp2 & DISGR2_RESM_INT) {
 909                        value = ioread32(reg);
 910                        value &= ~DISGR2_RESM_INT;
 911                        iowrite32(value, reg);
 912                        pr_info("fotg210 udc resume\n");
 913                }
 914                if (int_grp2 & DISGR2_ISO_SEQ_ERR_INT) {
 915                        value = ioread32(reg);
 916                        value &= ~DISGR2_ISO_SEQ_ERR_INT;
 917                        iowrite32(value, reg);
 918                        pr_info("fotg210 iso sequence error\n");
 919                }
 920                if (int_grp2 & DISGR2_ISO_SEQ_ABORT_INT) {
 921                        value = ioread32(reg);
 922                        value &= ~DISGR2_ISO_SEQ_ABORT_INT;
 923                        iowrite32(value, reg);
 924                        pr_info("fotg210 iso sequence abort\n");
 925                }
 926                if (int_grp2 & DISGR2_TX0BYTE_INT) {
 927                        fotg210_clear_tx0byte(fotg210);
 928                        value = ioread32(reg);
 929                        value &= ~DISGR2_TX0BYTE_INT;
 930                        iowrite32(value, reg);
 931                        pr_info("fotg210 transferred 0 byte\n");
 932                }
 933                if (int_grp2 & DISGR2_RX0BYTE_INT) {
 934                        fotg210_clear_rx0byte(fotg210);
 935                        value = ioread32(reg);
 936                        value &= ~DISGR2_RX0BYTE_INT;
 937                        iowrite32(value, reg);
 938                        pr_info("fotg210 received 0 byte\n");
 939                }
 940                if (int_grp2 & DISGR2_DMA_ERROR) {
 941                        value = ioread32(reg);
 942                        value &= ~DISGR2_DMA_ERROR;
 943                        iowrite32(value, reg);
 944                }
 945        }
 946
 947        if (int_grp & DIGR_INT_G0) {
 948                void __iomem *reg = fotg210->reg + FOTG210_DISGR0;
 949                u32 int_grp0 = ioread32(reg);
 950                u32 int_msk0 = ioread32(fotg210->reg + FOTG210_DMISGR0);
 951                struct usb_ctrlrequest ctrl;
 952
 953                int_grp0 &= ~int_msk0;
 954
 955                /* the highest priority in this source register */
 956                if (int_grp0 & DISGR0_CX_COMABT_INT) {
 957                        fotg210_clear_comabt_int(fotg210);
 958                        pr_info("fotg210 CX command abort\n");
 959                }
 960
 961                if (int_grp0 & DISGR0_CX_SETUP_INT) {
 962                        if (fotg210_setup_packet(fotg210, &ctrl)) {
 963                                spin_unlock(&fotg210->lock);
 964                                if (fotg210->driver->setup(&fotg210->gadget,
 965                                                           &ctrl) < 0)
 966                                        fotg210_set_cxstall(fotg210);
 967                                spin_lock(&fotg210->lock);
 968                        }
 969                }
 970                if (int_grp0 & DISGR0_CX_COMEND_INT)
 971                        pr_info("fotg210 cmd end\n");
 972
 973                if (int_grp0 & DISGR0_CX_IN_INT)
 974                        fotg210_ep0in(fotg210);
 975
 976                if (int_grp0 & DISGR0_CX_OUT_INT)
 977                        fotg210_ep0out(fotg210);
 978
 979                if (int_grp0 & DISGR0_CX_COMFAIL_INT) {
 980                        fotg210_set_cxstall(fotg210);
 981                        pr_info("fotg210 ep0 fail\n");
 982                }
 983        }
 984
 985        if (int_grp & DIGR_INT_G1) {
 986                void __iomem *reg = fotg210->reg + FOTG210_DISGR1;
 987                u32 int_grp1 = ioread32(reg);
 988                u32 int_msk1 = ioread32(fotg210->reg + FOTG210_DMISGR1);
 989                int fifo;
 990
 991                int_grp1 &= ~int_msk1;
 992
 993                for (fifo = 0; fifo < FOTG210_MAX_FIFO_NUM; fifo++) {
 994                        if (int_grp1 & DISGR1_IN_INT(fifo))
 995                                fotg210_in_fifo_handler(fotg210->ep[fifo + 1]);
 996
 997                        if ((int_grp1 & DISGR1_OUT_INT(fifo)) ||
 998                            (int_grp1 & DISGR1_SPK_INT(fifo)))
 999                                fotg210_out_fifo_handler(fotg210->ep[fifo + 1]);
1000                }
1001        }
1002
1003        spin_unlock(&fotg210->lock);
1004
1005        return IRQ_HANDLED;
1006}
1007
1008static void fotg210_disable_unplug(struct fotg210_udc *fotg210)
1009{
1010        u32 reg = ioread32(fotg210->reg + FOTG210_PHYTMSR);
1011
1012        reg &= ~PHYTMSR_UNPLUG;
1013        iowrite32(reg, fotg210->reg + FOTG210_PHYTMSR);
1014}
1015
1016static int fotg210_udc_start(struct usb_gadget *g,
1017                struct usb_gadget_driver *driver)
1018{
1019        struct fotg210_udc *fotg210 = gadget_to_fotg210(g);
1020        u32 value;
1021
1022        /* hook up the driver */
1023        driver->driver.bus = NULL;
1024        fotg210->driver = driver;
1025
1026        /* enable device global interrupt */
1027        value = ioread32(fotg210->reg + FOTG210_DMCR);
1028        value |= DMCR_GLINT_EN;
1029        iowrite32(value, fotg210->reg + FOTG210_DMCR);
1030
1031        return 0;
1032}
1033
1034static void fotg210_init(struct fotg210_udc *fotg210)
1035{
1036        u32 value;
1037
1038        /* disable global interrupt and set int polarity to active high */
1039        iowrite32(GMIR_MHC_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY,
1040                  fotg210->reg + FOTG210_GMIR);
1041
1042        /* disable device global interrupt */
1043        value = ioread32(fotg210->reg + FOTG210_DMCR);
1044        value &= ~DMCR_GLINT_EN;
1045        iowrite32(value, fotg210->reg + FOTG210_DMCR);
1046
1047        /* disable all fifo interrupt */
1048        iowrite32(~(u32)0, fotg210->reg + FOTG210_DMISGR1);
1049
1050        /* disable cmd end */
1051        value = ioread32(fotg210->reg + FOTG210_DMISGR0);
1052        value |= DMISGR0_MCX_COMEND;
1053        iowrite32(value, fotg210->reg + FOTG210_DMISGR0);
1054}
1055
1056static int fotg210_udc_stop(struct usb_gadget *g,
1057                struct usb_gadget_driver *driver)
1058{
1059        struct fotg210_udc *fotg210 = gadget_to_fotg210(g);
1060        unsigned long   flags;
1061
1062        spin_lock_irqsave(&fotg210->lock, flags);
1063
1064        fotg210_init(fotg210);
1065        fotg210->driver = NULL;
1066
1067        spin_unlock_irqrestore(&fotg210->lock, flags);
1068
1069        return 0;
1070}
1071
1072static struct usb_gadget_ops fotg210_gadget_ops = {
1073        .udc_start              = fotg210_udc_start,
1074        .udc_stop               = fotg210_udc_stop,
1075};
1076
1077static int fotg210_udc_remove(struct platform_device *pdev)
1078{
1079        struct fotg210_udc *fotg210 = platform_get_drvdata(pdev);
1080
1081        usb_del_gadget_udc(&fotg210->gadget);
1082        iounmap(fotg210->reg);
1083        free_irq(platform_get_irq(pdev, 0), fotg210);
1084
1085        fotg210_ep_free_request(&fotg210->ep[0]->ep, fotg210->ep0_req);
1086        kfree(fotg210);
1087
1088        return 0;
1089}
1090
1091static int fotg210_udc_probe(struct platform_device *pdev)
1092{
1093        struct resource *res, *ires;
1094        struct fotg210_udc *fotg210 = NULL;
1095        struct fotg210_ep *_ep[FOTG210_MAX_NUM_EP];
1096        int ret = 0;
1097        int i;
1098
1099        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1100        if (!res) {
1101                pr_err("platform_get_resource error.\n");
1102                return -ENODEV;
1103        }
1104
1105        ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1106        if (!ires) {
1107                pr_err("platform_get_resource IORESOURCE_IRQ error.\n");
1108                return -ENODEV;
1109        }
1110
1111        ret = -ENOMEM;
1112
1113        /* initialize udc */
1114        fotg210 = kzalloc(sizeof(struct fotg210_udc), GFP_KERNEL);
1115        if (fotg210 == NULL) {
1116                pr_err("kzalloc error\n");
1117                goto err_alloc;
1118        }
1119
1120        for (i = 0; i < FOTG210_MAX_NUM_EP; i++) {
1121                _ep[i] = kzalloc(sizeof(struct fotg210_ep), GFP_KERNEL);
1122                if (_ep[i] == NULL) {
1123                        pr_err("_ep kzalloc error\n");
1124                        goto err_alloc;
1125                }
1126                fotg210->ep[i] = _ep[i];
1127        }
1128
1129        fotg210->reg = ioremap(res->start, resource_size(res));
1130        if (fotg210->reg == NULL) {
1131                pr_err("ioremap error.\n");
1132                goto err_map;
1133        }
1134
1135        spin_lock_init(&fotg210->lock);
1136
1137        platform_set_drvdata(pdev, fotg210);
1138
1139        fotg210->gadget.ops = &fotg210_gadget_ops;
1140
1141        fotg210->gadget.max_speed = USB_SPEED_HIGH;
1142        fotg210->gadget.dev.parent = &pdev->dev;
1143        fotg210->gadget.dev.dma_mask = pdev->dev.dma_mask;
1144        fotg210->gadget.name = udc_name;
1145
1146        INIT_LIST_HEAD(&fotg210->gadget.ep_list);
1147
1148        for (i = 0; i < FOTG210_MAX_NUM_EP; i++) {
1149                struct fotg210_ep *ep = fotg210->ep[i];
1150
1151                if (i) {
1152                        INIT_LIST_HEAD(&fotg210->ep[i]->ep.ep_list);
1153                        list_add_tail(&fotg210->ep[i]->ep.ep_list,
1154                                      &fotg210->gadget.ep_list);
1155                }
1156                ep->fotg210 = fotg210;
1157                INIT_LIST_HEAD(&ep->queue);
1158                ep->ep.name = fotg210_ep_name[i];
1159                ep->ep.ops = &fotg210_ep_ops;
1160                usb_ep_set_maxpacket_limit(&ep->ep, (unsigned short) ~0);
1161        }
1162        usb_ep_set_maxpacket_limit(&fotg210->ep[0]->ep, 0x40);
1163        fotg210->gadget.ep0 = &fotg210->ep[0]->ep;
1164        INIT_LIST_HEAD(&fotg210->gadget.ep0->ep_list);
1165
1166        fotg210->ep0_req = fotg210_ep_alloc_request(&fotg210->ep[0]->ep,
1167                                GFP_KERNEL);
1168        if (fotg210->ep0_req == NULL)
1169                goto err_req;
1170
1171        fotg210_init(fotg210);
1172
1173        fotg210_disable_unplug(fotg210);
1174
1175        ret = request_irq(ires->start, fotg210_irq, IRQF_SHARED,
1176                          udc_name, fotg210);
1177        if (ret < 0) {
1178                pr_err("request_irq error (%d)\n", ret);
1179                goto err_irq;
1180        }
1181
1182        ret = usb_add_gadget_udc(&pdev->dev, &fotg210->gadget);
1183        if (ret)
1184                goto err_add_udc;
1185
1186        dev_info(&pdev->dev, "version %s\n", DRIVER_VERSION);
1187
1188        return 0;
1189
1190err_add_udc:
1191err_irq:
1192        free_irq(ires->start, fotg210);
1193
1194err_req:
1195        fotg210_ep_free_request(&fotg210->ep[0]->ep, fotg210->ep0_req);
1196
1197err_map:
1198        if (fotg210->reg)
1199                iounmap(fotg210->reg);
1200
1201err_alloc:
1202        kfree(fotg210);
1203
1204        return ret;
1205}
1206
1207static struct platform_driver fotg210_driver = {
1208        .driver         = {
1209                .name = (char *)udc_name,
1210                .owner  = THIS_MODULE,
1211        },
1212        .probe          = fotg210_udc_probe,
1213        .remove         = fotg210_udc_remove,
1214};
1215
1216module_platform_driver(fotg210_driver);
1217
1218MODULE_AUTHOR("Yuan-Hsin Chen, Feng-Hsin Chiang <john453@faraday-tech.com>");
1219MODULE_LICENSE("GPL");
1220MODULE_DESCRIPTION(DRIVER_DESC);
1221
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