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Add BCM2835 (Raspberry Pi) framebuffer and mailbox implementations

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This commit is contained in:
Aaron Lindsay
2012-09-30 22:48:44 -04:00
parent 925192fca1
commit af22b6fe46
6 changed files with 237 additions and 6 deletions
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devices/bcm2835_videocore.c Normal file
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/*
Copyright (C) 2012, Aaron Lindsay <aaron@aclindsay.com>
This file is part of Aedrix.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <types.h>
#include <framebuffer.h>
#include <kmalloc.h>
#include <print.h>
#include <devices/bcm2835_mailbox.h>
struct bcm2835_config {
uint32 width;
uint32 height;
uint32 vwidth;
uint32 vheight;
uint32 pitch;
uint32 color_depth;
uint32 xoffset;
uint32 yoffset;
uint32 fb_base_addr;
uint32 size;
};
#define MAILBOX_BUFFER_SIZE (32*4*2)
#define FB_WIDTH 1024
#define FB_HEIGHT 768
struct fbdev bcm2835_fb_device;
int bcm2835_videocore_init(struct fb *f, unsigned int color_depth) {
struct bcm2835_config *cfg;
uint32 result;
void *mailbox_buffer_orig, *mailbox_buffer;
if (!(mailbox_buffer_orig = kmalloc(MAILBOX_BUFFER_SIZE))) {
return -1;
}
/* Round mailbox buffer to multiple of 0x10 because the low 4 bits of
the mailbox are used to send the channel, and therefore can't hold the low 4
bits of the address */
if ((uint32)mailbox_buffer_orig & 0xf)
mailbox_buffer = (void *)((uint32)mailbox_buffer_orig & ~0xf) + 0x10;
else
mailbox_buffer = mailbox_buffer_orig;
cfg = (struct bcm2835_config *)mailbox_buffer;
cfg->width = FB_WIDTH;
cfg->height = FB_HEIGHT;
cfg->vwidth = FB_WIDTH;
cfg->vheight = FB_HEIGHT;
cfg->pitch = 0;
cfg->color_depth = color_depth;
cfg->xoffset = 0;
cfg->yoffset = 0;
cfg->fb_base_addr = 0;
cfg->size = 0;
mailbox_write(MBOX_FB, (uint32)cfg);
result = mailbox_read(MBOX_FB);
if (result || !cfg->fb_base_addr) {
print("Error: did not request a proper framebuffer\n");
return -1;
}
f->device = &bcm2835_fb_device;
f->device->fbaddr = (void*)cfg->fb_base_addr;
f->width = cfg->width;
f->device->pixelwidth = cfg->width;
f->height = cfg->height;
f->device->pixelheight = cfg->height;
f->color_depth = color_depth;
f->device->color_depth = color_depth;
return 0;
}