sys/arm/broadcom/bcm2835/bcm2835_mbox.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/systm.h>
  31 #include <sys/bus.h>
  32 #include <sys/kernel.h>
  33 #include <sys/lock.h>
  34 #include <sys/module.h>
  35 #include <sys/mutex.h>
  36 #include <sys/sx.h>
  37 #include <sys/rman.h>
  38 #include <machine/bus.h>
  39
  40 #include <dev/ofw/ofw_bus.h>
  41 #include <dev/ofw/ofw_bus_subr.h>
  42
  43 #include <arm/broadcom/bcm2835/bcm2835_firmware.h>
  44 #include <arm/broadcom/bcm2835/bcm2835_mbox.h>
  45 #include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
  46 #include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
  47
  48 #include "mbox_if.h"
  49
  50 #define REG_READ        0x00
  51 #define REG_POL         0x10
  52 #define REG_SENDER      0x14
  53 #define REG_STATUS      0x18
  54 #define         STATUS_FULL     0x80000000
  55 #define         STATUS_EMPTY    0x40000000
  56 #define REG_CONFIG      0x1C
  57 #define         CONFIG_DATA_IRQ 0x00000001
  58 #define REG_WRITE       0x20 /* This is Mailbox 1 address */
  59
  60 #define MBOX_MSG(chan, data)    (((data) & ~0xf) | ((chan) & 0xf))
  61 #define MBOX_CHAN(msg)          ((msg) & 0xf)
  62 #define MBOX_DATA(msg)          ((msg) & ~0xf)
  63
  64 #define MBOX_LOCK(sc)   do {    \
  65         mtx_lock(&(sc)->lock);  \
  66 } while(0)
  67
  68 #define MBOX_UNLOCK(sc) do {            \
  69         mtx_unlock(&(sc)->lock);        \
  70 } while(0)
  71
  72 #ifdef  DEBUG
  73 #define dprintf(fmt, args...) printf(fmt, ##args)
  74 #else
  75 #define dprintf(fmt, args...)
  76 #endif
  77
  78 struct bcm_mbox_softc {
  79         struct mtx              lock;
  80         struct resource *       mem_res;
  81         struct resource *       irq_res;
  82         void*                   intr_hl;
  83         bus_space_tag_t         bst;
  84         bus_space_handle_t      bsh;
  85         int                     msg[BCM2835_MBOX_CHANS];
  86         int                     have_message[BCM2835_MBOX_CHANS];
  87         struct sx               property_chan_lock;
  88 };
  89
  90 #define mbox_read_4(sc, reg)            \
  91     bus_space_read_4((sc)->bst, (sc)->bsh, reg)
  92 #define mbox_write_4(sc, reg, val)              \
  93     bus_space_write_4((sc)->bst, (sc)->bsh, reg, val)
  94
  95 static struct ofw_compat_data compat_data[] = {
  96         {"broadcom,bcm2835-mbox",       1},
  97         {"brcm,bcm2835-mbox",           1},
  98         {NULL,                          0}
  99 };
 100
 101 static int
 102 bcm_mbox_read_msg(struct bcm_mbox_softc *sc, int *ochan)
 103 {
 104 #ifdef DEBUG
 105         uint32_t data;
 106 #endif
 107         uint32_t msg;
 108         int chan;
 109
 110         msg = mbox_read_4(sc, REG_READ);
 111         dprintf("bcm_mbox_intr: raw data %08x\n", msg);
 112         chan = MBOX_CHAN(msg);
 113 #ifdef DEBUG
 114         data = MBOX_DATA(msg);
 115 #endif
 116         if (sc->msg[chan]) {
 117                 printf("bcm_mbox_intr: channel %d oveflow\n", chan);
 118                 return (1);
 119         }
 120         dprintf("bcm_mbox_intr: chan %d, data %08x\n", chan, data);
 121         sc->msg[chan] = msg;
 122
 123         if (ochan != NULL)
 124                 *ochan = chan;
 125
 126         return (0);
 127 }
 128
 129 static void
 130 bcm_mbox_intr(void *arg)
 131 {
 132         struct bcm_mbox_softc *sc = arg;
 133         int chan;
 134
 135         MBOX_LOCK(sc);
 136         while (!(mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
 137                 if (bcm_mbox_read_msg(sc, &chan) == 0) {
 138                         sc->have_message[chan] = 1;
 139                         wakeup(&sc->have_message[chan]);
 140                 }
 141         MBOX_UNLOCK(sc);
 142 }
 143
 144 static int
 145 bcm_mbox_probe(device_t dev)
 146 {
 147
 148         if (!ofw_bus_status_okay(dev))
 149                 return (ENXIO);
 150
 151         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
 152                 return (ENXIO);
 153
 154         device_set_desc(dev, "BCM2835 VideoCore Mailbox");
 155
 156         return (BUS_PROBE_DEFAULT);
 157 }
 158
 159 static int
 160 bcm_mbox_attach(device_t dev)
 161 {
 162         struct bcm_mbox_softc *sc = device_get_softc(dev);
 163         int i;
 164         int rid = 0;
 165
 166         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
 167         if (sc->mem_res == NULL) {
 168                 device_printf(dev, "could not allocate memory resource\n");
 169                 return (ENXIO);
 170         }
 171
 172         sc->bst = rman_get_bustag(sc->mem_res);
 173         sc->bsh = rman_get_bushandle(sc->mem_res);
 174
 175         rid = 0;
 176         sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
 177         if (sc->irq_res == NULL) {
 178                 device_printf(dev, "could not allocate interrupt resource\n");
 179                 return (ENXIO);
 180         }
 181
 182         /* Setup and enable the timer */
 183         if (bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
 184             NULL, bcm_mbox_intr, sc, &sc->intr_hl) != 0) {
 185                 bus_release_resource(dev, SYS_RES_IRQ, rid, sc->irq_res);
 186                 device_printf(dev, "Unable to setup the clock irq handler.\n");
 187                 return (ENXIO);
 188         }
 189
 190         mtx_init(&sc->lock, "vcio mbox", NULL, MTX_DEF);
 191         for (i = 0; i < BCM2835_MBOX_CHANS; i++) {
 192                 sc->msg[i] = 0;
 193                 sc->have_message[i] = 0;
 194         }
 195
 196         sx_init(&sc->property_chan_lock, "mboxprop");
 197
 198         /* Read all pending messages */
 199         while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY) == 0)
 200                 (void)mbox_read_4(sc, REG_READ);
 201
 202         mbox_write_4(sc, REG_CONFIG, CONFIG_DATA_IRQ);
 203
 204         return (0);
 205 }
 206
 207 /*
 208  * Mailbox API
 209  */
 210 static int
 211 bcm_mbox_write(device_t dev, int chan, uint32_t data)
 212 {
 213         int limit = 1000;
 214         struct bcm_mbox_softc *sc = device_get_softc(dev);
 215
 216         dprintf("bcm_mbox_write: chan %d, data %08x\n", chan, data);
 217         MBOX_LOCK(sc);
 218         sc->have_message[chan] = 0;
 219         while ((mbox_read_4(sc, REG_STATUS) & STATUS_FULL) && --limit)
 220                 DELAY(5);
 221         if (limit == 0) {
 222                 printf("bcm_mbox_write: STATUS_FULL stuck");
 223                 MBOX_UNLOCK(sc);
 224                 return (EAGAIN);
 225         }
 226         mbox_write_4(sc, REG_WRITE, MBOX_MSG(chan, data));
 227         MBOX_UNLOCK(sc);
 228
 229         return (0);
 230 }
 231
 232 static int
 233 bcm_mbox_read(device_t dev, int chan, uint32_t *data)
 234 {
 235         struct bcm_mbox_softc *sc = device_get_softc(dev);
 236         int err, read_chan;
 237
 238         dprintf("bcm_mbox_read: chan %d\n", chan);
 239
 240         err = 0;
 241         MBOX_LOCK(sc);
 242         if (!cold) {
 243                 if (sc->have_message[chan] == 0) {
 244                         if (mtx_sleep(&sc->have_message[chan], &sc->lock, 0,
 245                             "mbox", 10*hz) != 0) {
 246                                 device_printf(dev, "timeout waiting for message on chan %d\n", chan);
 247                                 err = ETIMEDOUT;
 248                         }
 249                 }
 250         } else {
 251                 do {
 252                         /* Wait for a message */
 253                         while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
 254                                 ;
 255                         /* Read the message */
 256                         if (bcm_mbox_read_msg(sc, &read_chan) != 0) {
 257                                 err = EINVAL;
 258                                 goto out;
 259                         }
 260                 } while (read_chan != chan);
 261         }
 262         /*
 263          *  get data from intr handler, the same channel is never coming
 264          *  because of holding sc lock.
 265          */
 266         *data = MBOX_DATA(sc->msg[chan]);
 267         sc->msg[chan] = 0;
 268         sc->have_message[chan] = 0;
 269 out:
 270         MBOX_UNLOCK(sc);
 271         dprintf("bcm_mbox_read: chan %d, data %08x\n", chan, *data);
 272
 273         return (err);
 274 }
 275
 276 static device_method_t bcm_mbox_methods[] = {
 277         DEVMETHOD(device_probe,         bcm_mbox_probe),
 278         DEVMETHOD(device_attach,        bcm_mbox_attach),
 279
 280         DEVMETHOD(mbox_read,            bcm_mbox_read),
 281         DEVMETHOD(mbox_write,           bcm_mbox_write),
 282
 283         DEVMETHOD_END
 284 };
 285
 286 static driver_t bcm_mbox_driver = {
 287         "mbox",
 288         bcm_mbox_methods,
 289         sizeof(struct bcm_mbox_softc),
 290 };
 291
 292 EARLY_DRIVER_MODULE(mbox, simplebus, bcm_mbox_driver, 0, 0,
 293     BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LAST);
 294
 295 static void
 296 bcm2835_mbox_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
 297 {
 298         bus_addr_t *addr;
 299
 300         if (err)
 301                 return;
 302         addr = (bus_addr_t *)arg;
 303         *addr = ARMC_TO_VCBUS(segs[0].ds_addr);
 304 }
 305
 306 static void *
 307 bcm2835_mbox_init_dma(device_t dev, size_t len, bus_dma_tag_t *tag,
 308     bus_dmamap_t *map, bus_addr_t *phys)
 309 {
 310         void *buf;
 311         int err;
 312
 313         err = bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
 314             bcm283x_dmabus_peripheral_lowaddr(), BUS_SPACE_MAXADDR, NULL, NULL,
 315             len, 1, len, 0, NULL, NULL, tag);
 316         if (err != 0) {
 317                 device_printf(dev, "can't create DMA tag\n");
 318                 return (NULL);
 319         }
 320
 321         err = bus_dmamem_alloc(*tag, &buf, 0, map);
 322         if (err != 0) {
 323                 bus_dma_tag_destroy(*tag);
 324                 device_printf(dev, "can't allocate dmamem\n");
 325                 return (NULL);
 326         }
 327
 328         err = bus_dmamap_load(*tag, *map, buf, len, bcm2835_mbox_dma_cb,
 329             phys, 0);
 330         if (err != 0) {
 331                 bus_dmamem_free(*tag, buf, *map);
 332                 bus_dma_tag_destroy(*tag);
 333                 device_printf(dev, "can't load DMA map\n");
 334                 return (NULL);
 335         }
 336
 337         return (buf);
 338 }
 339
 340 static int
 341 bcm2835_mbox_err(device_t dev, bus_addr_t msg_phys, uint32_t resp_phys,
 342         struct bcm2835_mbox_hdr *msg, size_t len)
 343 {
 344         int idx;
 345         struct bcm2835_mbox_tag_hdr *tag;
 346         uint8_t *last;
 347
 348         if ((uint32_t)msg_phys != resp_phys) {
 349                 device_printf(dev, "response channel mismatch\n");
 350                 return (EIO);
 351         }
 352         if (msg->code != BCM2835_MBOX_CODE_RESP_SUCCESS) {
 353                 device_printf(dev, "mbox response error\n");
 354                 return (EIO);
 355         }
 356
 357         /* Loop until the end tag. */
 358         tag = (struct bcm2835_mbox_tag_hdr *)(msg + 1);
 359         last = (uint8_t *)msg + len;
 360         for (idx = 0; tag->tag != 0; idx++) {
 361                 /*
 362                  * When setting the GPIO config or state the firmware doesn't
 363                  * set tag->val_len correctly.
 364                  */
 365                 if ((tag->tag == BCM2835_FIRMWARE_TAG_SET_GPIO_CONFIG ||
 366                      tag->tag == BCM2835_FIRMWARE_TAG_SET_GPIO_STATE) &&
 367                     tag->val_len == 0) {
 368                         tag->val_len = BCM2835_MBOX_TAG_VAL_LEN_RESPONSE |
 369                             tag->val_buf_size;
 370                 }
 371                 if ((tag->val_len & BCM2835_MBOX_TAG_VAL_LEN_RESPONSE) == 0) {
 372                         device_printf(dev, "tag %d response error\n", idx);
 373                         return (EIO);
 374                 }
 375                 /* Clear the response bit. */
 376                 tag->val_len &= ~BCM2835_MBOX_TAG_VAL_LEN_RESPONSE;
 377
 378                 /* Next tag. */
 379                 tag = (struct bcm2835_mbox_tag_hdr *)((uint8_t *)tag +
 380                     sizeof(*tag) + tag->val_buf_size);
 381
 382                 if ((uint8_t *)tag > last) {
 383                         device_printf(dev, "mbox buffer size error\n");
 384                         return (EIO);
 385                 }
 386         }
 387
 388         return (0);
 389 }
 390
 391 int
 392 bcm2835_mbox_property(void *msg, size_t msg_size)
 393 {
 394         struct bcm_mbox_softc *sc;
 395         bus_dma_tag_t msg_tag;
 396         bus_dmamap_t msg_map;
 397         bus_addr_t msg_phys;
 398         char *buf;
 399         uint32_t reg;
 400         device_t mbox;
 401         int err;
 402
 403         /* get mbox device */
 404         mbox = devclass_get_device(devclass_find("mbox"), 0);
 405         if (mbox == NULL)
 406                 return (ENXIO);
 407
 408         sc = device_get_softc(mbox);
 409         sx_xlock(&sc->property_chan_lock);
 410
 411         /* Allocate memory for the message */
 412         buf = bcm2835_mbox_init_dma(mbox, msg_size, &msg_tag, &msg_map,
 413             &msg_phys);
 414         if (buf == NULL) {
 415                 err = ENOMEM;
 416                 goto out;
 417         }
 418
 419         memcpy(buf, msg, msg_size);
 420
 421         bus_dmamap_sync(msg_tag, msg_map,
 422             BUS_DMASYNC_PREWRITE);
 423
 424         MBOX_WRITE(mbox, BCM2835_MBOX_CHAN_PROP, (uint32_t)msg_phys);
 425         MBOX_READ(mbox, BCM2835_MBOX_CHAN_PROP, &reg);
 426
 427         bus_dmamap_sync(msg_tag, msg_map,
 428             BUS_DMASYNC_PREREAD);
 429
 430         memcpy(msg, buf, msg_size);
 431
 432         err = bcm2835_mbox_err(mbox, msg_phys, reg,
 433             (struct bcm2835_mbox_hdr *)msg, msg_size);
 434
 435         bus_dmamap_unload(msg_tag, msg_map);
 436         bus_dmamem_free(msg_tag, buf, msg_map);
 437         bus_dma_tag_destroy(msg_tag);
 438 out:
 439         sx_xunlock(&sc->property_chan_lock);
 440         return (err);
 441 }
 442
 443 int
 444 bcm2835_mbox_set_power_state(uint32_t device_id, boolean_t on)
 445 {
 446         struct msg_set_power_state msg;
 447         int err;
 448
 449         memset(&msg, 0, sizeof(msg));
 450         msg.hdr.buf_size = sizeof(msg);
 451         msg.hdr.code = BCM2835_MBOX_CODE_REQ;
 452         msg.tag_hdr.tag = BCM2835_MBOX_TAG_SET_POWER_STATE;
 453         msg.tag_hdr.val_buf_size = sizeof(msg.body);
 454         msg.tag_hdr.val_len = sizeof(msg.body.req);
 455         msg.body.req.device_id = device_id;
 456         msg.body.req.state = (on ? BCM2835_MBOX_POWER_ON : 0) |
 457             BCM2835_MBOX_POWER_WAIT;
 458         msg.end_tag = 0;
 459
 460         err = bcm2835_mbox_property(&msg, sizeof(msg));
 461
 462         return (err);
 463 }
 464
 465 int
 466 bcm2835_mbox_notify_xhci_reset(uint32_t pci_dev_addr)
 467 {
 468         struct msg_notify_xhci_reset msg;
 469         int err;
 470
 471         memset(&msg, 0, sizeof(msg));
 472         msg.hdr.buf_size = sizeof(msg);
 473         msg.hdr.code = BCM2835_MBOX_CODE_REQ;
 474         msg.tag_hdr.tag = BCM2835_MBOX_TAG_NOTIFY_XHCI_RESET;
 475         msg.tag_hdr.val_buf_size = sizeof(msg.body);
 476         msg.tag_hdr.val_len = sizeof(msg.body.req);
 477         msg.body.req.pci_device_addr = pci_dev_addr;
 478         msg.end_tag = 0;
 479
 480         err = bcm2835_mbox_property(&msg, sizeof(msg));
 481
 482         return (err);
 483 }
 484
 485 int
 486 bcm2835_mbox_get_clock_rate(uint32_t clock_id, uint32_t *hz)
 487 {
 488         struct msg_get_clock_rate msg;
 489         int err;
 490
 491         memset(&msg, 0, sizeof(msg));
 492         msg.hdr.buf_size = sizeof(msg);
 493         msg.hdr.code = BCM2835_MBOX_CODE_REQ;
 494         msg.tag_hdr.tag = BCM2835_MBOX_TAG_GET_CLOCK_RATE;
 495         msg.tag_hdr.val_buf_size = sizeof(msg.body);
 496         msg.tag_hdr.val_len = sizeof(msg.body.req);
 497         msg.body.req.clock_id = clock_id;
 498         msg.end_tag = 0;
 499
 500         err = bcm2835_mbox_property(&msg, sizeof(msg));
 501         *hz = msg.body.resp.rate_hz;
 502
 503         return (err);
 504 }
 505
 506 int
 507 bcm2835_mbox_fb_get_w_h(struct bcm2835_fb_config *fb)
 508 {
 509         int err;
 510         struct msg_fb_get_w_h msg;
 511
 512         memset(&msg, 0, sizeof(msg));
 513         msg.hdr.buf_size = sizeof(msg);
 514         msg.hdr.code = BCM2835_MBOX_CODE_REQ;
 515         BCM2835_MBOX_INIT_TAG(&msg.physical_w_h, GET_PHYSICAL_W_H);
 516         msg.physical_w_h.tag_hdr.val_len = 0;
 517         msg.end_tag = 0;
 518
 519         err = bcm2835_mbox_property(&msg, sizeof(msg));
 520         if (err == 0) {
 521                 fb->xres = msg.physical_w_h.body.resp.width;
 522                 fb->yres = msg.physical_w_h.body.resp.height;
 523         }
 524
 525         return (err);
 526 }
 527
 528 int
 529 bcm2835_mbox_fb_get_bpp(struct bcm2835_fb_config *fb)
 530 {
 531         int err;
 532         struct msg_fb_get_bpp msg;
 533
 534         memset(&msg, 0, sizeof(msg));
 535         msg.hdr.buf_size = sizeof(msg);
 536         msg.hdr.code = BCM2835_MBOX_CODE_REQ;
 537         BCM2835_MBOX_INIT_TAG(&msg.bpp, GET_DEPTH);
 538         msg.bpp.tag_hdr.val_len = 0;
 539         msg.end_tag = 0;
 540
 541         err = bcm2835_mbox_property(&msg, sizeof(msg));
 542         if (err == 0)
 543                 fb->bpp = msg.bpp.body.resp.bpp;
 544
 545         return (err);
 546 }
 547
 548 int
 549 bcm2835_mbox_fb_init(struct bcm2835_fb_config *fb)
 550 {
 551         int err;
 552         struct msg_fb_setup msg;
 553
 554         memset(&msg, 0, sizeof(msg));
 555         msg.hdr.buf_size = sizeof(msg);
 556         msg.hdr.code = BCM2835_MBOX_CODE_REQ;
 557         BCM2835_MBOX_INIT_TAG(&msg.physical_w_h, SET_PHYSICAL_W_H);
 558         msg.physical_w_h.body.req.width = fb->xres;
 559         msg.physical_w_h.body.req.height = fb->yres;
 560         BCM2835_MBOX_INIT_TAG(&msg.virtual_w_h, SET_VIRTUAL_W_H);
 561         msg.virtual_w_h.body.req.width = fb->vxres;
 562         msg.virtual_w_h.body.req.height = fb->vyres;
 563         BCM2835_MBOX_INIT_TAG(&msg.offset, SET_VIRTUAL_OFFSET);
 564         msg.offset.body.req.x = fb->xoffset;
 565         msg.offset.body.req.y = fb->yoffset;
 566         BCM2835_MBOX_INIT_TAG(&msg.depth, SET_DEPTH);
 567         msg.depth.body.req.bpp = fb->bpp;
 568         BCM2835_MBOX_INIT_TAG(&msg.alpha, SET_ALPHA_MODE);
 569         msg.alpha.body.req.alpha = BCM2835_MBOX_ALPHA_MODE_IGNORED;
 570         BCM2835_MBOX_INIT_TAG(&msg.buffer, ALLOCATE_BUFFER);
 571         msg.buffer.body.req.alignment = PAGE_SIZE;
 572         BCM2835_MBOX_INIT_TAG(&msg.pitch, GET_PITCH);
 573         msg.end_tag = 0;
 574
 575         err = bcm2835_mbox_property(&msg, sizeof(msg));
 576         if (err == 0) {
 577                 fb->xres = msg.physical_w_h.body.resp.width;
 578                 fb->yres = msg.physical_w_h.body.resp.height;
 579                 fb->vxres = msg.virtual_w_h.body.resp.width;
 580                 fb->vyres = msg.virtual_w_h.body.resp.height;
 581                 fb->xoffset = msg.offset.body.resp.x;
 582                 fb->yoffset = msg.offset.body.resp.y;
 583                 fb->pitch = msg.pitch.body.resp.pitch;
 584                 fb->base = VCBUS_TO_ARMC(msg.buffer.body.resp.fb_address);
 585                 fb->size = msg.buffer.body.resp.fb_size;
 586         }
 587
 588         return (err);
 589 }