附录：
网上的这个网页：
http://blog.csdn.net/comwise/article/details/11727445提供的lcd.c文件。
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/wait.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/div64.h>
#include <linux/types.h>
#include <asm/mach/map.h>
#include <mach/regs-lcd.h>
#include <mach/regs-gpio.h>
#include <mach/fb.h>
struct lcd_regs{
unsigned long lcdcon1;
unsigned long lcdcon2;
unsigned long lcdcon3;
unsigned long lcdcon4;
unsigned long lcdcon5;
unsigned long lcdsaddr1;
unsigned long lcdsaddr2;
unsigned long lcdsaddr3;
unsigned long redlut;
unsigned long greenlut;
unsigned long bluelut;
unsigned long reserved[9];
unsigned long dithmode;
unsigned long tpal;
unsigned long lcdintpnd;
unsigned long lcdsrcpnd;
unsigned long lcdintmsk;
unsigned long lpcsel;
};
static volatile struct lcd_regs *lcd_regs_base;
static struct fb_info *fb_x35;
static volatile unsigned long *gpbcon;
static volatile unsigned long *gpbdat;
static volatile unsigned long *gpccon;
static volatile unsigned long *gpdcon;
static volatile unsigned long *gpgcon;
static u32 pseudo_palette[16];
static inline unsigned int chan_to_field(unsigned int chan,
struct fb_bitfield* bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
//设置颜色
static int x35_setcolreg(unsigned int regno, unsigned int red,
unsigned int green, unsigned int blue,
unsigned int transp, struct fb_info *info)
{
unsigned int val;
if (regno > 16)
return 1;
val = chan_to_field(red, &info->var.red);
val |= chan_to_field(green, &info->var.green);
val |= chan_to_field(blue, &info->var.blue);
pseudo_palette[regno] = val;
return 0;
}
static struct fb_ops mini_fb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = x35_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
static int lcd_init(void)
{
//1)分配一个fb_info
fb_x35 = framebuffer_alloc(0, NULL);
//2)填充fb_info结构
// 1 设置固定参数
// 2 设置可变参数
// 3 设置操作函数
// 4 其他的设置
strcpy(fb_x35->fix.id, "mylcd");
fb_x35->fix.smem_len = 240 * 320 * 32 / 8; // frambuffer的大小
fb_x35->fix.type = FB_TYPE_PACKED_PIXELS;//扫描方式，以像素点扫描 非隔行扫描
fb_x35->fix.visual = FB_VISUAL_TRUECOLOR; //色阶 真彩色
fb_x35->fix.line_length = 240 * 4;
fb_x35->var.xres = 240;
fb_x35->var.yres = 320;
fb_x35->var.xres_virtual = 240;
fb_x35->var.yres_virtual = 320;
fb_x35->var.bits_per_pixel = 32; //每个像素点占有的字节数
//颜色放置的方式，这里是真彩色为 8:8:8,每种颜色占用8位
fb_x35->var.red.offset = 16;
fb_x35->var.red.length = 8;
fb_x35->var.blue.offset = 8;
fb_x35->var.blue.length = 8;
fb_x35->var.green.offset = 0;
fb_x35->var.green.length = 8;
fb_x35->var.activate = FB_ACTIVATE_NOW; //设置颜色立即生效
//设置操作函数
fb_x35->fbops = &mini_fb_ops;
fb_x35->pseudo_palette = pseudo_palette; //调色板
fb_x35->screen_size = 240 * 320 * 32 / 8; //屏幕尺寸的大小
//3)设置硬件，驱动lcd
// 1 设置lcd引脚可用
// 2 设置lcd控制器寄存器
// 3 设置其他的
gpbcon = ioremap(0x56000010, 8);
gpbdat = gpbcon+1;
gpccon = ioremap(0x5600020, 4);
gpdcon = ioremap(0x5600030, 4);
gpgcon = ioremap(0x5600060, 4);
*gpccon = 0xaaaaaaaa;
*gpdcon = 0xaaaaaaaa;
*gpgcon |= (0x3 << (4 * 2)); //lcd_pwren lcd电源引脚
lcd_regs_base = ioremap(0x4d000000, sizeof(struct lcd_regs));
lcd_regs_base->lcdcon1 = (9 << 8) | (3 << 5) | (0xd << 1);
lcd_regs_base->lcdcon2 = (8 << 24) | (319 << 14) | (4 << 6) | (9 << 0);
lcd_regs_base->lcdcon3 = (15 << 19) | (239 << 8) | (16 << 0) ;
lcd_regs_base->lcdcon4 = 5;
lcd_regs_base->lcdcon5 = (0 << 12) | (0 << 10) | (1<<6) | (0 << 1) | (0 << 0) ;
//vsync swap set error
//分配显存，将显存地址告诉framebuffer
fb_x35->screen_base = dma_alloc_writecombine(NULL, fb_x35->fix.smem_len,
&(fb_x35->fix.smem_start), GFP_KERNEL);//fb_x35->fix.smem_start = xxx; /* 显存的物理地址 */
lcd_regs_base->lcdsaddr1 = (fb_x35->fix.smem_start >> 1) & (~(3 << 30)); //[31~0]=0b00xx xxxx ... 30误写成20
lcd_regs_base->lcdsaddr2 = ((fb_x35->fix.smem_start + fb_x35->fix.smem_len) >> 1) & 0x1fffff;
lcd_regs_base->lcdsaddr3 = (0 << 11) | ((240 * 32 / 16) << 0); //行的长度有错
//启动lcd
lcd_regs_base->lcdcon1 |= (1 << 0);
lcd_regs_base->lcdcon5 |= (1 << 3);
/* MINI2440的背光电路也是通过LCD_PWREN来控制的, 不需要单独的背光引脚 */
//4)注册framebuffer
register_framebuffer(fb_x35);
return 0;
}
static void lcd_exit(void)
{
//注销framebuffer结构
//释放分配的frambuffer显存
//关闭lcd控制器以及电源
//取消映射地址
//释放framebuffer结构
unregister_framebuffer(fb_x35);
lcd_regs_base->lcdcon1 &= ~(1 << 0);
lcd_regs_base->lcdcon5 &= ~(1 << 3);
dma_free_writecombine(NULL, fb_x35->fix.smem_len, fb_x35->screen_base, fb_x35->fix.smem_start);
iounmap(lcd_regs_base);
iounmap(gpccon);
iounmap(gpdcon);
iounmap(gpgcon);
framebuffer_release(fb_x35);
}
module_init(lcd_init);
module_exit(lcd_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("LCL");
注意：里面的图像调整其实还不是最关键的，关键是vden不翻转 就没有图像，我调试过好多次，幸亏论坛网友热心帮助，才点亮lcd。
