bcm2835_fbd.c revision 330897
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: stable/11/sys/arm/broadcom/bcm2835/bcm2835_fbd.c 330897 2018-03-14 03:19:51Z eadler $"); 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/fdt/fdt_common.h> 49#include <dev/ofw/ofw_bus.h> 50#include <dev/ofw/ofw_bus_subr.h> 51 52#include <dev/fb/fbreg.h> 53#include <dev/vt/vt.h> 54#include <dev/vt/colors/vt_termcolors.h> 55 56#include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h> 57 58#include "fb_if.h" 59#include "mbox_if.h" 60 61#define FB_DEPTH 24 62 63struct bcmsc_softc { 64 struct fb_info info; 65 int fbswap; 66 struct bcm2835_fb_config fb; 67 device_t dev; 68}; 69 70static struct ofw_compat_data compat_data[] = { 71 {"broadcom,bcm2835-fb", 1}, 72 {"brcm,bcm2708-fb", 1}, 73 {NULL, 0} 74}; 75 76static int bcm_fb_probe(device_t); 77static int bcm_fb_attach(device_t); 78 79static int 80bcm_fb_init(struct bcmsc_softc *sc, struct bcm2835_fb_config *fb) 81{ 82 int err; 83 84 err = 0; 85 86 memset(fb, 0, sizeof(*fb)); 87 if (bcm2835_mbox_fb_get_w_h(fb) != 0) 88 return (ENXIO); 89 fb->bpp = FB_DEPTH; 90 91 fb->vxres = fb->xres; 92 fb->vyres = fb->yres; 93 fb->xoffset = fb->yoffset = 0; 94 95 if ((err = bcm2835_mbox_fb_init(fb)) != 0) { 96 device_printf(sc->dev, "bcm2835_mbox_fb_init failed, err=%d\n", err); 97 return (ENXIO); 98 } 99 100 return (0); 101} 102 103static int 104bcm_fb_setup_fbd(struct bcmsc_softc *sc) 105{ 106 struct bcm2835_fb_config fb; 107 device_t fbd; 108 int err; 109 110 err = bcm_fb_init(sc, &fb); 111 if (err) 112 return (err); 113 114 memset(&sc->info, 0, sizeof(sc->info)); 115 sc->info.fb_name = device_get_nameunit(sc->dev); 116 117 sc->info.fb_vbase = (intptr_t)pmap_mapdev(fb.base, fb.size); 118 sc->info.fb_pbase = fb.base; 119 sc->info.fb_size = fb.size; 120 sc->info.fb_bpp = sc->info.fb_depth = fb.bpp; 121 sc->info.fb_stride = fb.pitch; 122 sc->info.fb_width = fb.xres; 123 sc->info.fb_height = fb.yres; 124#ifdef VM_MEMATTR_WRITE_COMBINING 125 sc->info.fb_flags = FB_FLAG_MEMATTR; 126 sc->info.fb_memattr = VM_MEMATTR_WRITE_COMBINING; 127#endif 128 129 if (sc->fbswap) { 130 switch (sc->info.fb_bpp) { 131 case 24: 132 vt_generate_cons_palette(sc->info.fb_cmap, 133 COLOR_FORMAT_RGB, 0xff, 0, 0xff, 8, 0xff, 16); 134 sc->info.fb_cmsize = 16; 135 break; 136 case 32: 137 vt_generate_cons_palette(sc->info.fb_cmap, 138 COLOR_FORMAT_RGB, 0xff, 16, 0xff, 8, 0xff, 0); 139 sc->info.fb_cmsize = 16; 140 break; 141 } 142 } 143 144 fbd = device_add_child(sc->dev, "fbd", device_get_unit(sc->dev)); 145 if (fbd == NULL) { 146 device_printf(sc->dev, "Failed to add fbd child\n"); 147 pmap_unmapdev(sc->info.fb_vbase, sc->info.fb_size); 148 return (ENXIO); 149 } else if (device_probe_and_attach(fbd) != 0) { 150 device_printf(sc->dev, "Failed to attach fbd device\n"); 151 device_delete_child(sc->dev, fbd); 152 pmap_unmapdev(sc->info.fb_vbase, sc->info.fb_size); 153 return (ENXIO); 154 } 155 156 device_printf(sc->dev, "%dx%d(%dx%d@%d,%d) %dbpp\n", fb.xres, fb.yres, 157 fb.vxres, fb.vyres, fb.xoffset, fb.yoffset, fb.bpp); 158 device_printf(sc->dev, 159 "fbswap: %d, pitch %d, base 0x%08x, screen_size %d\n", 160 sc->fbswap, fb.pitch, fb.base, fb.size); 161 162 return (0); 163} 164 165static int 166bcm_fb_resync_sysctl(SYSCTL_HANDLER_ARGS) 167{ 168 struct bcmsc_softc *sc = arg1; 169 struct bcm2835_fb_config fb; 170 int val; 171 int err; 172 173 val = 0; 174 err = sysctl_handle_int(oidp, &val, 0, req); 175 if (err || !req->newptr) /* error || read request */ 176 return (err); 177 178 bcm_fb_init(sc, &fb); 179 180 return (0); 181} 182 183static void 184bcm_fb_sysctl_init(struct bcmsc_softc *sc) 185{ 186 struct sysctl_ctx_list *ctx; 187 struct sysctl_oid *tree_node; 188 struct sysctl_oid_list *tree; 189 190 /* 191 * Add system sysctl tree/handlers. 192 */ 193 ctx = device_get_sysctl_ctx(sc->dev); 194 tree_node = device_get_sysctl_tree(sc->dev); 195 tree = SYSCTL_CHILDREN(tree_node); 196 SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "resync", 197 CTLFLAG_RW | CTLTYPE_UINT, sc, sizeof(*sc), 198 bcm_fb_resync_sysctl, "IU", "Set to resync framebuffer with VC"); 199} 200 201static int 202bcm_fb_probe(device_t dev) 203{ 204 205 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 206 return (ENXIO); 207 208 device_set_desc(dev, "BCM2835 VT framebuffer driver"); 209 210 return (BUS_PROBE_DEFAULT); 211} 212 213static int 214bcm_fb_attach(device_t dev) 215{ 216 char bootargs[2048], *n, *p, *v; 217 int err; 218 phandle_t chosen; 219 struct bcmsc_softc *sc; 220 221 sc = device_get_softc(dev); 222 sc->dev = dev; 223 224 /* Newer firmware versions needs an inverted color palette. */ 225 sc->fbswap = 0; 226 chosen = OF_finddevice("/chosen"); 227 if (chosen != 0 && 228 OF_getprop(chosen, "bootargs", &bootargs, sizeof(bootargs)) > 0) { 229 p = bootargs; 230 while ((v = strsep(&p, " ")) != NULL) { 231 if (*v == '\0') 232 continue; 233 n = strsep(&v, "="); 234 if (strcmp(n, "bcm2708_fb.fbswap") == 0 && v != NULL) 235 if (*v == '1') 236 sc->fbswap = 1; 237 } 238 } 239 240 bcm_fb_sysctl_init(sc); 241 242 err = bcm_fb_setup_fbd(sc); 243 if (err) 244 return (err); 245 246 return (0); 247} 248 249static struct fb_info * 250bcm_fb_helper_getinfo(device_t dev) 251{ 252 struct bcmsc_softc *sc; 253 254 sc = device_get_softc(dev); 255 256 return (&sc->info); 257} 258 259static device_method_t bcm_fb_methods[] = { 260 /* Device interface */ 261 DEVMETHOD(device_probe, bcm_fb_probe), 262 DEVMETHOD(device_attach, bcm_fb_attach), 263 264 /* Framebuffer service methods */ 265 DEVMETHOD(fb_getinfo, bcm_fb_helper_getinfo), 266 267 DEVMETHOD_END 268}; 269 270static devclass_t bcm_fb_devclass; 271 272static driver_t bcm_fb_driver = { 273 "fb", 274 bcm_fb_methods, 275 sizeof(struct bcmsc_softc), 276}; 277 278DRIVER_MODULE(bcm2835fb, ofwbus, bcm_fb_driver, bcm_fb_devclass, 0, 0); 279DRIVER_MODULE(bcm2835fb, simplebus, bcm_fb_driver, bcm_fb_devclass, 0, 0); 280