bcm2835_fbd.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
    5  * Copyright (c) 2012, 2013 The FreeBSD Foundation
    6  * All rights reserved.
    7  *
    8  * Portions of this software were developed by Oleksandr Rybalko
    9  * under sponsorship from the FreeBSD Foundation.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  */
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/bio.h>
   39 #include <sys/bus.h>
   40 #include <sys/fbio.h>
   41 #include <sys/kernel.h>
   42 #include <sys/malloc.h>
   43 #include <sys/module.h>
   44 
   45 #include <vm/vm.h>
   46 #include <vm/pmap.h>
   47 
   48 #include <dev/ofw/ofw_bus.h>
   49 #include <dev/ofw/ofw_bus_subr.h>
   50 
   51 #include <dev/fb/fbreg.h>
   52 #include <dev/vt/vt.h>
   53 #include <dev/vt/colors/vt_termcolors.h>
   54 
   55 #include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
   56 
   57 #include "fb_if.h"
   58 #include "mbox_if.h"
   59 
   60 #define FB_DEPTH                24
   61 
   62 struct bcmsc_softc {
   63         struct fb_info                  info;
   64         int                             fbswap;
   65         struct bcm2835_fb_config        fb;
   66         device_t                        dev;
   67 };
   68 
   69 static struct ofw_compat_data compat_data[] = {
   70         {"broadcom,bcm2835-fb",         1},
   71         {"brcm,bcm2708-fb",             1},
   72         {NULL,                          0}
   73 };
   74 
   75 static int bcm_fb_probe(device_t);
   76 static int bcm_fb_attach(device_t);
   77 
   78 static int
   79 bcm_fb_init(struct bcmsc_softc *sc, struct bcm2835_fb_config *fb)
   80 {
   81         int err;
   82 
   83         err = 0;
   84 
   85         memset(fb, 0, sizeof(*fb));
   86         if (bcm2835_mbox_fb_get_w_h(fb) != 0)
   87                 return (ENXIO);
   88         if (bcm2835_mbox_fb_get_bpp(fb) != 0)
   89                 return (ENXIO);
   90         if (fb->bpp < FB_DEPTH) {
   91                 device_printf(sc->dev, "changing fb bpp from %d to %d\n",
   92                     fb->bpp, FB_DEPTH);
   93                 fb->bpp = FB_DEPTH;
   94         } else
   95                 device_printf(sc->dev, "keeping existing fb bpp of %d\n",
   96                     fb->bpp);
   97 
   98         fb->vxres = fb->xres;
   99         fb->vyres = fb->yres;
  100         fb->xoffset = fb->yoffset = 0;
  101 
  102         if ((err = bcm2835_mbox_fb_init(fb)) != 0) {
  103                 device_printf(sc->dev, "bcm2835_mbox_fb_init failed, err=%d\n",
  104                     err);
  105                 return (ENXIO);
  106         }
  107 
  108         return (0);
  109 }
  110 
  111 static int
  112 bcm_fb_setup_fbd(struct bcmsc_softc *sc)
  113 {
  114         struct bcm2835_fb_config fb;
  115         device_t fbd;
  116         int err;
  117 
  118         err = bcm_fb_init(sc, &fb);
  119         if (err)
  120                 return (err);
  121 
  122         memset(&sc->info, 0, sizeof(sc->info));
  123         sc->info.fb_name = device_get_nameunit(sc->dev);
  124 
  125         sc->info.fb_vbase = (intptr_t)pmap_mapdev(fb.base, fb.size);
  126         sc->info.fb_pbase = fb.base;
  127         sc->info.fb_size = fb.size;
  128         sc->info.fb_bpp = sc->info.fb_depth = fb.bpp;
  129         sc->info.fb_stride = fb.pitch;
  130         sc->info.fb_width = fb.xres;
  131         sc->info.fb_height = fb.yres;
  132 #ifdef VM_MEMATTR_WRITE_COMBINING
  133         sc->info.fb_flags = FB_FLAG_MEMATTR;
  134         sc->info.fb_memattr = VM_MEMATTR_WRITE_COMBINING;
  135 #endif
  136 
  137         if (sc->fbswap) {
  138                 switch (sc->info.fb_bpp) {
  139                 case 24:
  140                         vt_config_cons_colors(&sc->info,
  141                             COLOR_FORMAT_RGB, 0xff, 0, 0xff, 8, 0xff, 16);
  142                         sc->info.fb_cmsize = 16;
  143                         break;
  144                 case 32:
  145                         vt_config_cons_colors(&sc->info,
  146                             COLOR_FORMAT_RGB, 0xff, 16, 0xff, 8, 0xff, 0);
  147                         sc->info.fb_cmsize = 16;
  148                         break;
  149                 }
  150         }
  151 
  152         fbd = device_add_child(sc->dev, "fbd", device_get_unit(sc->dev));
  153         if (fbd == NULL) {
  154                 device_printf(sc->dev, "Failed to add fbd child\n");
  155                 pmap_unmapdev((void *)sc->info.fb_vbase, sc->info.fb_size);
  156                 return (ENXIO);
  157         } else if (device_probe_and_attach(fbd) != 0) {
  158                 device_printf(sc->dev, "Failed to attach fbd device\n");
  159                 device_delete_child(sc->dev, fbd);
  160                 pmap_unmapdev((void *)sc->info.fb_vbase, sc->info.fb_size);
  161                 return (ENXIO);
  162         }
  163 
  164         device_printf(sc->dev, "%dx%d(%dx%d@%d,%d) %dbpp\n", fb.xres, fb.yres,
  165             fb.vxres, fb.vyres, fb.xoffset, fb.yoffset, fb.bpp);
  166         device_printf(sc->dev,
  167             "fbswap: %d, pitch %d, base 0x%08x, screen_size %d\n",
  168             sc->fbswap, fb.pitch, fb.base, fb.size);
  169 
  170         return (0);
  171 }
  172 
  173 static int
  174 bcm_fb_resync_sysctl(SYSCTL_HANDLER_ARGS)
  175 {
  176         struct bcmsc_softc *sc = arg1;
  177         struct bcm2835_fb_config fb;
  178         int val;
  179         int err;
  180 
  181         val = 0;
  182         err = sysctl_handle_int(oidp, &val, 0, req);
  183         if (err || !req->newptr) /* error || read request */
  184                 return (err);
  185 
  186         bcm_fb_init(sc, &fb);
  187 
  188         return (0);
  189 }
  190 
  191 static void
  192 bcm_fb_sysctl_init(struct bcmsc_softc *sc)
  193 {
  194         struct sysctl_ctx_list *ctx;
  195         struct sysctl_oid *tree_node;
  196         struct sysctl_oid_list *tree;
  197 
  198         /*
  199          * Add system sysctl tree/handlers.
  200          */
  201         ctx = device_get_sysctl_ctx(sc->dev);
  202         tree_node = device_get_sysctl_tree(sc->dev);
  203         tree = SYSCTL_CHILDREN(tree_node);
  204         SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "resync",
  205             CTLFLAG_RW | CTLTYPE_UINT | CTLFLAG_NEEDGIANT, sc, sizeof(*sc),
  206             bcm_fb_resync_sysctl, "IU", "Set to resync framebuffer with VC");
  207 }
  208 
  209 static int
  210 bcm_fb_probe(device_t dev)
  211 {
  212 
  213         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
  214                 return (ENXIO);
  215 
  216         device_set_desc(dev, "BCM2835 VT framebuffer driver");
  217 
  218         return (BUS_PROBE_DEFAULT);
  219 }
  220 
  221 static int
  222 bcm_fb_attach(device_t dev)
  223 {
  224         char bootargs[2048], *n, *p, *v;
  225         int err;
  226         phandle_t chosen;
  227         struct bcmsc_softc *sc;
  228 
  229         sc = device_get_softc(dev);
  230         sc->dev = dev;
  231 
  232         /* Newer firmware versions needs an inverted color palette. */
  233         sc->fbswap = 0;
  234         chosen = OF_finddevice("/chosen");
  235         if (chosen != -1 &&
  236             OF_getprop(chosen, "bootargs", &bootargs, sizeof(bootargs)) > 0) {
  237                 p = bootargs;
  238                 while ((v = strsep(&p, " ")) != NULL) {
  239                         if (*v == '\0')
  240                                 continue;
  241                         n = strsep(&v, "=");
  242                         if (strcmp(n, "bcm2708_fb.fbswap") == 0 && v != NULL)
  243                                 if (*v == '1')
  244                                         sc->fbswap = 1;
  245                 }
  246         }
  247 
  248         bcm_fb_sysctl_init(sc);
  249 
  250         err = bcm_fb_setup_fbd(sc);
  251         if (err)
  252                 return (err);
  253 
  254         return (0);
  255 }
  256 
  257 static struct fb_info *
  258 bcm_fb_helper_getinfo(device_t dev)
  259 {
  260         struct bcmsc_softc *sc;
  261 
  262         sc = device_get_softc(dev);
  263 
  264         return (&sc->info);
  265 }
  266 
  267 static device_method_t bcm_fb_methods[] = {
  268         /* Device interface */
  269         DEVMETHOD(device_probe,         bcm_fb_probe),
  270         DEVMETHOD(device_attach,        bcm_fb_attach),
  271 
  272         /* Framebuffer service methods */
  273         DEVMETHOD(fb_getinfo,           bcm_fb_helper_getinfo),
  274 
  275         DEVMETHOD_END
  276 };
  277 
  278 static driver_t bcm_fb_driver = {
  279         "fb",
  280         bcm_fb_methods,
  281         sizeof(struct bcmsc_softc),
  282 };
  283 
  284 DRIVER_MODULE(bcm2835fb, ofwbus, bcm_fb_driver, 0, 0);
  285 DRIVER_MODULE(bcm2835fb, simplebus, bcm_fb_driver, 0, 0);

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FreeBSD/Linux Kernel Cross Reference sys/arm/broadcom/bcm2835/bcm2835_fbd.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/broadcom/bcm2835/bcm2835_fbd.c