fsl_diu_fb.c

U-BOOT,著名的Bootloader程序

/*
 * Copyright 2007 Freescale Semiconductor, Inc.
 * York Sun <[e-mail]>
 *
 * FSL DIU Framebuffer driver
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <i2c.h>
#include <malloc.h>

#include "fsl_diu_fb.h"

struct fb_videomode {
	const char *name;	/* optional */
	unsigned int refresh;		/* optional */
	unsigned int xres;
	unsigned int yres;
	unsigned int pixclock;
	unsigned int left_margin;
	unsigned int right_margin;
	unsigned int upper_margin;
	unsigned int lower_margin;
	unsigned int hsync_len;
	unsigned int vsync_len;
	unsigned int sync;
	unsigned int vmode;
	unsigned int flag;
};

#define FB_SYNC_VERT_HIGH_ACT	2	/* vertical sync high active	*/
#define FB_SYNC_COMP_HIGH_ACT	8	/* composite sync high active   */
#define FB_VMODE_NONINTERLACED  0	/* non interlaced */

/*
 * These parameters give default parameters
 * for video output 1024x768,
 * FIXME - change timing to proper amounts
 * hsync 31.5kHz, vsync 60Hz
 */
static struct fb_videomode fsl_diu_mode_1024 = {
	.refresh	= 60,
	.xres		= 1024,
	.yres		= 768,
	.pixclock	= 15385,
	.left_margin	= 160,
	.right_margin	= 24,
	.upper_margin	= 29,
	.lower_margin	= 3,
	.hsync_len	= 136,
	.vsync_len	= 6,
	.sync		= FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	.vmode		= FB_VMODE_NONINTERLACED
};

static struct fb_videomode fsl_diu_mode_1280 = {
	.name		= "1280x1024-60",
	.refresh	= 60,
	.xres		= 1280,
	.yres		= 1024,
	.pixclock	= 9375,
	.left_margin	= 38,
	.right_margin	= 128,
	.upper_margin	= 2,
	.lower_margin	= 7,
	.hsync_len	= 216,
	.vsync_len	= 37,
	.sync		= FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	.vmode		= FB_VMODE_NONINTERLACED
};

/*
 * These are the fields of area descriptor(in DDR memory) for every plane
 */
struct diu_ad {
	/* Word 0(32-bit) in DDR memory */
	unsigned int pix_fmt; /* hard coding pixel format */
	/* Word 1(32-bit) in DDR memory */
	unsigned int addr;
	/* Word 2(32-bit) in DDR memory */
	unsigned int src_size_g_alpha;
	/* Word 3(32-bit) in DDR memory */
	unsigned int aoi_size;
	/* Word 4(32-bit) in DDR memory */
	unsigned int offset_xyi;
	/* Word 5(32-bit) in DDR memory */
	unsigned int offset_xyd;
	/* Word 6(32-bit) in DDR memory */
	unsigned int ckmax_r:8;
	unsigned int ckmax_g:8;
	unsigned int ckmax_b:8;
	unsigned int res9:8;
	/* Word 7(32-bit) in DDR memory */
	unsigned int ckmin_r:8;
	unsigned int ckmin_g:8;
	unsigned int ckmin_b:8;
	unsigned int res10:8;
	/* Word 8(32-bit) in DDR memory */
	unsigned int next_ad;
	/* Word 9(32-bit) in DDR memory, just for 64-bit aligned */
	unsigned int res1;
	unsigned int res2;
	unsigned int res3;
}__attribute__ ((packed));

/*
 * DIU register map
 */
struct diu {
	unsigned int desc[3];
	unsigned int gamma;
	unsigned int pallete;
	unsigned int cursor;
	unsigned int curs_pos;
	unsigned int diu_mode;
	unsigned int bgnd;
	unsigned int bgnd_wb;
	unsigned int disp_size;
	unsigned int wb_size;
	unsigned int wb_mem_addr;
	unsigned int hsyn_para;
	unsigned int vsyn_para;
	unsigned int syn_pol;
	unsigned int thresholds;
	unsigned int int_status;
	unsigned int int_mask;
	unsigned int colorbar[8];
	unsigned int filling;
	unsigned int plut;
} __attribute__ ((packed));

struct diu_hw {
	struct diu *diu_reg;
	volatile unsigned int mode;		/* DIU operation mode */
};

struct diu_addr {
	unsigned char  *  paddr;	/* Virtual address */
	unsigned int	   offset;
};

/*
 * Modes of operation of DIU
 */
#define MFB_MODE0	0	/* DIU off */
#define MFB_MODE1	1	/* All three planes output to display */
#define MFB_MODE2	2	/* Plane 1 to display,
				 * planes 2+3 written back to memory */
#define MFB_MODE3	3	/* All three planes written back to memory */
#define MFB_MODE4	4	/* Color bar generation */

#define MAX_CURS		32

static struct fb_info fsl_fb_info;
static struct diu_addr gamma, cursor;
static struct diu_ad fsl_diu_fb_ad __attribute__ ((aligned(32)));
static struct diu_ad dummy_ad __attribute__ ((aligned(32)));
static unsigned char *dummy_fb;
static struct diu_hw dr = {
	.mode = MFB_MODE1,
};

int fb_enabled = 0;
int fb_initialized = 0;
const int default_xres = 1280;
const int default_pixel_format = 0x88882317;

static int map_video_memory(struct fb_info *info, unsigned long bytes_align);
static void enable_lcdc(void);
static void disable_lcdc(void);
static int fsl_diu_enable_panel(struct fb_info *info);
static int fsl_diu_disable_panel(struct fb_info *info);
static int allocate_buf(struct diu_addr *buf, u32 size, u32 bytes_align);
void diu_set_pixel_clock(unsigned int pixclock);

int fsl_diu_init(int xres,
		 unsigned int pixel_format,
		 int gamma_fix,
		 unsigned char *splash_bmp)
{
	struct fb_videomode *fsl_diu_mode_db;
	struct diu_ad *ad = &fsl_diu_fb_ad;
	struct diu *hw;
	struct fb_info *info = &fsl_fb_info;
	struct fb_var_screeninfo *var = &info->var;
	unsigned char *gamma_table_base;
	unsigned int i, j;

	debug("Enter fsl_diu_init\n");
	dr.diu_reg = (struct diu *) (CFG_DIU_ADDR);
	hw = (struct diu *) dr.diu_reg;

	disable_lcdc();

	if (xres == 1280) {
		fsl_diu_mode_db = &fsl_diu_mode_1280;
	} else {
		fsl_diu_mode_db = &fsl_diu_mode_1024;
	}

	if (0 == fb_initialized) {
		allocate_buf(&gamma, 768, 32);
		debug("gamma is allocated @ 0x%x\n",
			(unsigned int)gamma.paddr);
		allocate_buf(&cursor, MAX_CURS * MAX_CURS * 2, 32);
		debug("curosr is allocated @ 0x%x\n",
			(unsigned int)cursor.paddr);

		/* create a dummy fb and dummy ad */
		dummy_fb = malloc(64);
		if (NULL == dummy_fb) {
			printf("Cannot allocate dummy fb\n");
			return -1;
		}
		dummy_ad.addr = cpu_to_le32((unsigned int)dummy_fb);
		dummy_ad.pix_fmt = 0x88882317;
		dummy_ad.src_size_g_alpha = 0x04400000;	/* alpha = 0 */
		dummy_ad.aoi_size = 0x02000400;
		dummy_ad.offset_xyi = 0;
		dummy_ad.offset_xyd = 0;
		dummy_ad.next_ad = 0;
		/* Memory allocation for framebuffer */
		if (map_video_memory(info, 32)) {
			printf("Unable to allocate fb memory 1\n");
			return -1;
		}
	} else {
		memset(info->screen_base, 0, info->smem_len);
	}

	dr.diu_reg->desc[0] = (unsigned int) &dummy_ad;
	dr.diu_reg->desc[1] = (unsigned int) &dummy_ad;
	dr.diu_reg->desc[2] = (unsigned int) &dummy_ad;
	debug("dummy dr.diu_reg->desc[0] = 0x%x\n", dr.diu_reg->desc[0]);
	debug("dummy desc[0] = 0x%x\n", hw->desc[0]);

	/* read mode info */
	var->xres = fsl_diu_mode_db->xres;
	var->yres = fsl_diu_mode_db->yres;
	var->bits_per_pixel = 32;
	var->pixclock = fsl_diu_mode_db->pixclock;
	var->left_margin = fsl_diu_mode_db->left_margin;
	var->right_margin = fsl_diu_mode_db->right_margin;
	var->upper_margin = fsl_diu_mode_db->upper_margin;
	var->lower_margin = fsl_diu_mode_db->lower_margin;
	var->hsync_len = fsl_diu_mode_db->hsync_len;
	var->vsync_len = fsl_diu_mode_db->vsync_len;
	var->sync = fsl_diu_mode_db->sync;
	var->vmode = fsl_diu_mode_db->vmode;
	info->line_length = var->xres * var->bits_per_pixel / 8;
	info->logo_size = 0;
	info->logo_height = 0;

	ad->pix_fmt = pixel_format;
	ad->addr    = cpu_to_le32((unsigned int)info->screen_base);
	ad->src_size_g_alpha
			= cpu_to_le32((var->yres << 12) | var->xres);
	/* fix me. AOI should not be greater than display size */
	ad->aoi_size	= cpu_to_le32(( var->yres << 16) |  var->xres);
	ad->offset_xyi = 0;
	ad->offset_xyd = 0;

	/* Disable chroma keying function */
	ad->ckmax_r = 0;
	ad->ckmax_g = 0;
	ad->ckmax_b = 0;

	ad->ckmin_r = 255;
	ad->ckmin_g = 255;
	ad->ckmin_b = 255;

	gamma_table_base = gamma.paddr;
	debug("gamma_table_base is allocated @ 0x%x\n",