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#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 <linux/cdev.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/div64.h>
#include <asm/mach/map.h>
#include <mach/regs-lcd.h>
#include <mach/regs-gpio.h>
#include <mach/fb.h>
#define DBGprintk printk
//#define DBGprintk(...)
//LCDCON1定义
#define CLKVAL 4
#define MMODE 0
#define PNRMODE 3
#define BPPMODE 12
#define ENVIDOFF 0
#define ENVIDON 1
//LCDCON2定义
#define VBPD 2
#define LINEVAL (272-1)
#define VFPD 4 //原值4
#define VSPW 8 //原值8
//LCDCON3定义
#define HBPD 10
#define HOZVAL (480-1)
#define HFPD 19
//LCDCON4定义
#define MVAL 13
#define HSPW 30
//LCDCON5定义
#define BPP24BL 0
#define FRM565 1
#define INVVCLK 0
#define INVVLINE 1
#define INVVFRAME 1
#define INVVD 0
#define INVVDEN 0
#define INVPWREN 0
#define INVLEND 0
#define PWRENOFF 0
#define PWRENON 1
#define ENLEND 0
#define BSWP 0
#define HWSWP 1 //2440手册
//LCDSADD3定义
#define OFFSIZE 0 //因为虚拟屏幕和物理屏幕大小一样->0
#define LCDSADDR3 480//因为虚拟屏幕和物理屏幕大小一样->480
//这个结构体中寄存器名字使用大写的话会出现莫明奇妙的错误 需要再试试
struct s3c2440_reg
{
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;//BLUELUT地址0X4D000028
unsigned long reserved[9];//地址0X4D00004C，二者相差9个字节 为什么不是bluelut【9】
unsigned long dithmode;
unsigned long tpal;
unsigned long lcdintpnd;
unsigned long lcdsrcpnd;
unsigned long lcdintmsk;
unsigned long tconsel;
};
//有些需要定义成指针，因为 对应的函数是返回指针的函数
struct s3c2440_reg *s3c2440_regs;
static struct fb_info *mylcd_info;
//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];//
/* from pxafb.c */
static inline unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
{
chan &= 0xffff; //取出低16位
chan >>= 16 - bf->length;//chan保存相应颜色的取值
return chan << bf->offset; //
DBGprintk(" chan_to_field\n");
}
//设置调色板
static int s3c_lcdfb_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;
/* 用red,green,blue三原色构造出val */
val = chan_to_field(red, &info->var.red);
val |= chan_to_field(green, &info->var.green);
val |= chan_to_field(blue, &info->var.blue);
//((u32 *)(info->pseudo_palette))[regno] = val;
pseudo_palette[regno] = val;
DBGprintk(" val= %d\n",val);
DBGprintk(" s3c_lcdfb_setcolreg\n");
return 0;
}
static struct fb_ops s3c_lcdfb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = s3c_lcdfb_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
static int lcd_init(void)
{/* 分配一个fb_info */
mylcd_info = framebuffer_alloc(0,NULL);
if(mylcd_info ==NULL)//检查分配是否成功
DBGprintk(" framebuffer_alloc fail \n");
/* 设置固定的参数 */
strcpy(mylcd_info->fix.id, "mylcd");
mylcd_info->fix.smem_len = 480*272*16/8;// R G B 565 =16
mylcd_info->fix.type = FB_TYPE_PACKED_PIXELS;/* Packed Pixels 塞满 像素 */
mylcd_info->fix.visual = FB_VISUAL_TRUECOLOR; /* TFT 真彩色*/
mylcd_info->fix.line_length = 480*16/8;//一行480个像素 一个像素16位
/* 设置可变的参数 */
//硬件确定的分辨率
mylcd_info->var.xres = 480;
mylcd_info->var.yres = 272;
//虚拟分辨率；可以通过软件更该 类似电脑分辨率
mylcd_info->var.xres_virtual = 480;
mylcd_info->var.yres_virtual = 272;
mylcd_info->var.bits_per_pixel = 16;
/* RGB:565 ->红色偏移值11 绿色偏移值5 蓝色偏移值0*/
mylcd_info->var.red.offset = 11;
mylcd_info->var.red.length = 5;
mylcd_info->var.green.offset = 5;
mylcd_info->var.green.length = 6;
mylcd_info->var.blue.offset = 0;
mylcd_info->var.blue.length = 5;
mylcd_info->var.activate = FB_ACTIVATE_NOW;//看不懂就用默认值 默认值支持大多数
/* 设置操作函数 */
mylcd_info->fbops = &s3c_lcdfb_ops;
/* 其他的设置 */
mylcd_info->pseudo_palette = pseudo_palette; /* 伪16色颜色表 可能是兼容以前的程序，需要设置假的调色板*/
mylcd_info->screen_size = 480*272*16/8;
/* 3.1 配置GPIO用于LCD */
//GPBCON = ioremap(0x56000010, 8);//ioremap是一个返回指针的函数
//GPBDAT = GPBCON+1;
GPCCON = ioremap(0x56000020, 4);
GPDCON = ioremap(0x56000030, 4);
GPGCON = ioremap(0x56000060, 4);
//向GPCCVON写入值，特别注意GPCCON是指针
*GPCCON =0xaaaa02a9; /* GPIO管脚用于VD[7:0],LCDVF[2:0],VM,VFRAME,VLINE,VCLK,LEND */
*GPDCON = 0xaaaaaaaa; /* GPIO管脚用于VD[23:8] */
*GPGCON |= (3<<8); /* GPG4用作LCD_PWREN */
s3c2440_regs = ioremap(0X4D000000, sizeof(struct s3c2440_reg));
s3c2440_regs->lcdcon1= (CLKVAL <<8)|(MMODE<<7)|(PNRMODE<<5)|(BPPMODE<<1)|(ENVIDOFF<<0);
s3c2440_regs->lcdcon2= (VBPD<<24)|(LINEVAL<<14)|(VFPD<<6)|(VSPW<<0);
s3c2440_regs->lcdcon3= (HBPD<<19)|(HOZVAL<<8)|(HFPD<<0);
s3c2440_regs->lcdcon4 =(MVAL<<8)|(HSPW<<0);
s3c2440_regs->lcdcon5 =(FRM565<<11)|(INVVCLK<<10)|(INVVLINE<<9)|(INVVFRAME<<8)|(1<<3)|(1<<2)|(HWSWP<<0);
// 分配显存(framebuffer), 专用函数dma_alloc_writecombine分配 */
mylcd_info->screen_base = dma_alloc_writecombine(NULL, mylcd_info->fix.smem_len, &mylcd_info->fix.smem_start, GFP_KERNEL);
//并把地址告诉LCD控制器
s3c2440_regs->lcdsaddr1 = (mylcd_info->fix.smem_start >> 1) & ~(3<<30);//最高两位不需要 ->& ~(3<<30)
s3c2440_regs->lcdsaddr2 = ((mylcd_info->fix.smem_start + mylcd_info->fix.smem_len) >> 1) & 0x1fffff;//只关心21位-> & 0x1fffff
// 起始地址 + 大小 =结束地址
s3c2440_regs->lcdsaddr3 = (480*16/16); /* 一行的长度(单位: 2字节) */
/* 启动LCD */
s3c2440_regs->lcdcon5|= (0<<5)|(PWRENON<<3); /* 使能LCD本身 */
s3c2440_regs->lcdcon1|= (ENVIDON<<0); /* 使能LCD控制器 */
DBGprintk(" lcd_init\n");
/* 4. 注册 */
register_framebuffer(mylcd_info);
return 0;
}
static void lcd_exit(void)
{
unregister_framebuffer(mylcd_info);
s3c2440_regs->lcdcon1 &= ~(1<<0); /* 关闭LCD本身 */
dma_free_writecombine(NULL, mylcd_info->fix.smem_len, mylcd_info->screen_base, mylcd_info->fix.smem_start);
iounmap(s3c2440_regs);
iounmap(GPCCON);
iounmap(GPDCON);
iounmap(GPGCON);
framebuffer_release(mylcd_info);
DBGprintk(" lcd_exit\n");
}
module_init(lcd_init);
module_exit(lcd_exit);
MODULE_LICENSE("GPL"); |
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