aedrix-kernel/drivers/pl110.c

/*
    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 <frames.h>
#include <math.h>

#define PL110_CR_EN		0x001
#define PL110_CR_PWR		0x800
#define PL110_IOBASE		0xc0000000
#define PL110_PALBASE		(PL110_IOBASE + 0x200)

struct pl110_control {
	uint32	volatile timing0;	//0
	uint32	volatile timing1;	//4
	uint32	volatile timing2;	//8
	uint32	volatile timing3;	//c
	uint32	volatile upbase;	//10
	uint32	volatile lpbase;	//14
	uint32	volatile intrenable;	//18
	uint32	volatile control;	//1c
};

struct fbdev pl110_fb_device;

int pl110_init(struct fb *f, unsigned int color_depth) {
	unsigned int width, height;
	unsigned int fb_size, power;
	struct pl110_control *plio = (struct pl110_control*)PL110_IOBASE;
	struct frame *fr;

	/* 640x480 pixels */
	width = 640;
	height = 480;
	plio->timing0 = 0x3f1f3f9c;
	plio->timing1 = 0x080b61df;

	/* Allocate memory for framebuffer */
	fb_size = width * height * (color_depth / 8);
	power = log(fb_size) - log(CONFIG_PAGE_SIZE);
	if ((unsigned int)1<<power < fb_size)
		power++;
	fr = get_free_frames(power);
	if (!fr)
		return -1;

	plio->upbase = (uint32)fr->address;

	if (color_depth == FB_COLOR_DEPTH_8) {
		plio->control = 0x1827;
	} else if (color_depth == FB_COLOR_DEPTH_16) {
		plio->control = 0x1829;
	} else if (color_depth == FB_COLOR_DEPTH_24) {
		plio->control = 0x182B;
	} else {
		//assume 16 if nothing else fit
		color_depth = 16;
		plio->control = 0x1829;
	}

	f->device = &pl110_fb_device;
	f->device->fbaddr = (void*)plio->upbase;
	f->width = width;
	f->device->pixelwidth = width;
	f->height = height;
	f->device->pixelheight = height;

	f->color_depth = color_depth;
	f->device->color_depth = color_depth;

	return 0;
}