lxfb_core.c

Linux环境下视频显示卡设备的驱动程序源代码

/*
 * Geode LX framebuffer driver.
 *
 * Copyright (C) 2007 Advanced Micro Devices, Inc.
 * Built from gxfb (which is Copyright (C) 2006 Arcom Control Systems Ltd.)
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/console.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/uaccess.h>

#include "lxfb.h"

static char *mode_option;
static int noclear, nopanel, nocrt;
static int vram;
static int vt_switch;

/* Most of these modes are sorted in ascending order, but
 * since the first entry in this table is the "default" mode,
 * we try to make it something sane - 640x480-60 is sane
 */

static struct fb_videomode geode_modedb[] __initdata = {
	/* 640x480-60 */
	{ NULL, 60, 640, 480, 39682, 48, 8, 25, 2, 88, 2,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 640x400-70 */
	{ NULL, 70, 640, 400, 39770, 40, 8, 28, 5, 96, 2,
	  FB_SYNC_HOR_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 640x480-70 */
	{ NULL, 70, 640, 480, 35014, 88, 24, 15, 2, 64, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 640x480-72 */
	{ NULL, 72, 640, 480, 32102, 120, 16, 20, 1, 40, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 640x480-75 */
	{ NULL, 75, 640, 480, 31746, 120, 16, 16, 1, 64, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 640x480-85 */
	{ NULL, 85, 640, 480, 27780, 80, 56, 25, 1, 56, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 640x480-90 */
	{ NULL, 90, 640, 480, 26392, 96, 32, 22, 1, 64, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 640x480-100 */
	{ NULL, 100, 640, 480, 23167, 104, 40, 25, 1, 64, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 640x480-60 */
	{ NULL, 60, 640, 480, 39682, 48, 16, 25, 10, 88, 2,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 800x600-56 */
	{ NULL, 56, 800, 600, 27901, 128, 24, 22, 1, 72, 2,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 800x600-60 */
	{ NULL, 60, 800, 600, 25131, 72, 32, 23, 1, 136, 4,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 800x600-70 */
	{ NULL, 70, 800, 600, 21873, 120, 40, 21, 4, 80, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 800x600-72 */
	{ NULL, 72, 800, 600, 20052, 64, 56, 23, 37, 120, 6,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 800x600-75 */
	{ NULL, 75, 800, 600, 20202, 160, 16, 21, 1, 80, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 800x600-85 */
	{ NULL, 85, 800, 600, 17790, 152, 32, 27, 1, 64, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 800x600-90 */
	{ NULL, 90, 800, 600, 16648, 128, 40, 28, 1, 88, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 800x600-100 */
	{ NULL, 100, 800, 600, 14667, 136, 48, 27, 1, 88, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 800x600-60 */
	{ NULL, 60, 800, 600, 25131, 88, 40, 23, 1, 128, 4,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 1024x768-60 */
	{ NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 1024x768-70 */
	{ NULL, 70, 1024, 768, 13346, 144, 24, 29, 3, 136, 6,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 1024x768-72 */
	{ NULL, 72, 1024, 768, 12702, 168, 56, 29, 4, 112, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1024x768-75 */
	{ NULL, 75, 1024, 768, 12703, 176, 16, 28, 1, 96, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1024x768-85 */
	{ NULL, 85, 1024, 768, 10581, 208, 48, 36, 1, 96, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1024x768-90 */
	{ NULL, 90, 1024, 768, 9981, 176, 64, 37, 1, 112, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1024x768-100 */
	{ NULL, 100, 1024, 768, 8825, 184, 72, 42, 1, 112, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1024x768-60 */
	{ NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 1152x864-60 */
	{ NULL, 60, 1152, 864, 12251, 184, 64, 27, 1, 120, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1152x864-70 */
	{ NULL, 70, 1152, 864, 10254, 192, 72, 32, 8, 120, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1152x864-72 */
	{ NULL, 72, 1152, 864, 9866, 200, 72, 33, 7, 128, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1152x864-75 */
	{ NULL, 75, 1152, 864, 9259, 256, 64, 32, 1, 128, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1152x864-85 */
	{ NULL, 85, 1152, 864, 8357, 200, 72, 37, 3, 128, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1152x864-90 */
	{ NULL, 90, 1152, 864, 7719, 208, 80, 42, 9, 128, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1152x864-100 */
	{ NULL, 100, 1152, 864, 6947, 208, 80, 48, 3, 128, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1152x864-60 */
	{ NULL, 60, 1152, 864, 12251, 184, 64, 27, 1, 120, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 1280x1024-60 */
	{ NULL, 60, 1280, 1024, 9262, 248, 48, 38, 1, 112, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1280x1024-70 */
	{ NULL, 70, 1280, 1024, 7719, 224, 88, 38, 6, 136, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1280x1024-72 */
	{ NULL, 72, 1280, 1024, 7490, 224, 88, 39, 7, 136, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1280x1024-75 */
	{ NULL, 75, 1280, 1024, 7409, 248, 16, 38, 1, 144, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1280x1024-85 */
	{ NULL, 85, 1280, 1024, 6351, 224, 64, 44, 1, 160, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1280x1024-90 */
	{ NULL, 90, 1280, 1024, 5791, 240, 96, 51, 12, 144, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1280x1024-100 */
	{ NULL, 100, 1280, 1024, 5212, 240, 96, 57, 6, 144, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1280x1024-60 */
	{ NULL, 60, 1280, 1024, 9262, 248, 48, 38, 1, 112, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 1600x1200-60 */
	{ NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1600x1200-70 */
	{ NULL, 70, 1600, 1200, 5291, 304, 64, 46, 1, 192, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1600x1200-72 */
	{ NULL, 72, 1600, 1200, 5053, 288, 112, 47, 13, 176, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1600x1200-75 */
	{ NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1600x1200-85 */
	{ NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1600x1200-90 */
	{ NULL, 90, 1600, 1200, 3981, 304, 128, 60, 1, 176, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1600x1200-100 */
	{ NULL, 100, 1600, 1200, 3563, 304, 128, 67, 1, 176, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1600x1200-60 */
	{ NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 },
	/* 1920x1440-60 */
	{ NULL, 60, 1920, 1440, 4273, 344, 128, 56, 1, 208, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1920x1440-70 */
	{ NULL, 70, 1920, 1440, 3593, 360, 152, 55, 8, 208, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1920x1440-72 */
	{ NULL, 72, 1920, 1440, 3472, 360, 152, 68, 4, 208, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1920x1440-75 */
	{ NULL, 75, 1920, 1440, 3367, 352, 144, 56, 1, 224, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
	/* 1920x1440-85 */
	{ NULL, 85, 1920, 1440, 2929, 368, 152, 68, 1, 216, 3,
	  0, FB_VMODE_NONINTERLACED, 0 },
};

#ifdef CONFIG_OLPC
#include <asm/olpc.h>

static struct fb_videomode olpc_dcon_modedb[] __initdata = {
	/* The only mode the DCON has is 1200x900 */
	{ NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	  FB_VMODE_NONINTERLACED, 0 }
};

static void __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
{
	if (olpc_has_dcon()) {
		*modedb = (struct fb_videomode *) olpc_dcon_modedb;
		*size = ARRAY_SIZE(olpc_dcon_modedb);
	} else {
		*modedb = (struct fb_videomode *) geode_modedb;
		*size = ARRAY_SIZE(geode_modedb);
	}
}

#else
static void __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
{
	*modedb = (struct fb_videomode *) geode_modedb;
	*size = ARRAY_SIZE(geode_modedb);
}
#endif

static int lxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	if (var->xres > 1920 || var->yres > 1440)
		return -EINVAL;

	if (var->bits_per_pixel == 32) {
		var->red.offset   = 16; var->red.length   = 8;
		var->green.offset =  8; var->green.length = 8;
		var->blue.offset  =  0; var->blue.length  = 8;
	} else if (var->bits_per_pixel == 16) {
		var->red.offset   = 11; var->red.length   = 5;
		var->green.offset =  5; var->green.length = 6;
		var->blue.offset  =  0; var->blue.length  = 5;
	} else if (var->bits_per_pixel == 8) {
		var->red.offset   = 0; var->red.length   = 8;
		var->green.offset = 0; var->green.length = 8;
		var->blue.offset  = 0; var->blue.length  = 8;
	} else
		return -EINVAL;

	var->transp.offset = 0; var->transp.length = 0;

	/* Enough video memory? */
	if ((lx_get_pitch(var->xres, var->bits_per_pixel) * var->yres)
	    > info->fix.smem_len)
	  return -EINVAL;

	return 0;
}

static int lxfb_set_par(struct fb_info *info)
{
	if (info->var.bits_per_pixel > 8)
		info->fix.visual = FB_VISUAL_TRUECOLOR;
	else
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

	info->fix.line_length = lx_get_pitch(info->var.xres,
		info->var.bits_per_pixel);

	lx_set_mode(info);
	return 0;
}

static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
{
	chan &= 0xffff;
	chan >>= 16 - bf->length;
	return chan << bf->offset;
}

static int lxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
			   unsigned blue, unsigned transp,
			   struct fb_info *info)
{
	if (info->var.grayscale) {
		/* grayscale = 0.30*R + 0.59*G + 0.11*B */
		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
	}

	/* Truecolor has hardware independent palette */
	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
		u32 *pal = info->pseudo_palette;
		u32 v;

		if (regno >= 16)
			return -EINVAL;

		v  = chan_to_field(red, &info->var.red);
		v |= chan_to_field(green, &info->var.green);
		v |= chan_to_field(blue, &info->var.blue);

		pal[regno] = v;
	} else {
		if (regno >= 256)
			return -EINVAL;

		lx_set_palette_reg(info, regno, red, green, blue);
	}

	return 0;
}

static int lxfb_blank(int blank_mode, struct fb_info *info)
{
	return lx_blank_display(info, blank_mode);
}


static int __init lxfb_map_video_memory(struct fb_info *info,
					struct pci_dev *dev)
{
	struct lxfb_par *par = info->par;
	int ret;

	ret = pci_enable_device(dev);