sys/arm/broadcom/bcm2835/bcm2835_fbd.c

   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_generate_cons_palette(sc->info.fb_cmap,
 141                             COLOR_FORMAT_RGB, 0xff, 0, 0xff, 8, 0xff, 16);
 142                         sc->info.fb_cmsize = 16;
 143                         break;
 144                 case 32:
 145                         vt_generate_cons_palette(sc->info.fb_cmap,
 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(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(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 devclass_t bcm_fb_devclass;
 279
 280 static driver_t bcm_fb_driver = {
 281         "fb",
 282         bcm_fb_methods,
 283         sizeof(struct bcmsc_softc),
 284 };
 285
 286 DRIVER_MODULE(bcm2835fb, ofwbus, bcm_fb_driver, bcm_fb_devclass, 0, 0);
 287 DRIVER_MODULE(bcm2835fb, simplebus, bcm_fb_driver, bcm_fb_devclass, 0, 0);