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