/*************************************************************************

    > File Name: lcd.c

    > Author:

    > Mail:

    > Created Time: 2016年11月02日 星期三 15时21分59秒

 ************************************************************************/

#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 <asm/mach/map.h>

#include <asm/arch/regs-lcd.h>

#include <asm/arch/regs-gpio.h>

#include <asm/arch/fb.h>

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;

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[];

    unsigned long dithmode;

    unsigned long tpal;

    unsigned long lcdintpnd;

    unsigned long lcdsrcpnd;

    unsigned long lcdintmsk;

    unsigned long lpcsel;

};

static int s3c_lcdfb_setcolreg( unsigned int regno, unsigned int red, unsigned int green, unsigned int blue, unsigned int transp, struct fb_info *info );

static u32 pseudo_palette[];

static volatile struct lcd_regs *lcd_reg;  

static struct fb_info *s3c_fb;

static struct fb_ops s3c_fb_ops = {

        .owner= THIS_MODULE,

        .fb_setcolreg= s3c_lcdfb_setcolreg,

        .fb_fillrect= cfb_fillrect,   /* Needed !!! */

        .fb_copyarea= cfb_copyarea,/* Needed !!! */

        .fb_imageblit= cfb_imageblit,/* Needed !!! */

};

static unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)

{

    chan &= 0xffff;

    chan >>=  - bf->length;

    return chan << bf->offset;

}

/*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 >  )

        return ;

    /* 用红绿蓝构造出调色板 */

    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;

    return ;

}

static int lcd_init( void )

{

    /* 分配一个fb_info结构体 */

    s3c_fb = framebuffer_alloc(,NULL);  //分配的空间为fb_info + 0 (0为私有空间)

    /* 设置 */

    /* 设置固定的参数 */

    strcpy( s3c_fb->fix.id, "mylcd" );

    s3c_fb->fix.smem_len = **/;

    s3c_fb->fix.type = FB_TYPE_PACKED_PIXELS;

    s3c_fb->fix.visual = FB_VISUAL_TRUECOLOR;   /* TFT*/

    s3c_fb->fix.line_length = *;

    /* 设置可变的参数 */

    s3c_fb->var.xres = ;

    s3c_fb->var.yres = ;

    s3c_fb->var.xres_virtual = ;

    s3c_fb->var.yres_virtual = ;

    s3c_fb->var.xres_virtual = ;

    s3c_fb->var.yres_virtual = ;

    s3c_fb->var.bits_per_pixel = ;

    s3c_fb->var.red.offset = ;

    s3c_fb->var.red.length = ;

    s3c_fb->var.green.offset = ;

    s3c_fb->var.green.length = ;

    s3c_fb->var.blue.offset = ;

    s3c_fb->var.blue.length = ;

    s3c_fb->var.activate = FB_ACTIVATE_NOW;

    /* 设置操作函数 */

    s3c_fb->fbops = &s3c_fb_ops;

    /* 其他设置 */

    s3c_fb->pseudo_palette = pseudo_palette;

    //s3c_fb->screen_base = ;           //显存的虚拟地址

    s3c_fb->screen_size = **;    //显存的大小

    /* 配置GPIO */

    gpbcon = ioremap(0x56000010,);

    gpbdat = gpbcon + ;

    gpccon = ioremap(0x56000020,);

    gpdcon = ioremap(0x56000030,);

    gpgcon = ioremap(0x56000060,);

    *gpccon = 0xaaaaaaaa;

    *gpdcon = 0xaaaaaaaa;

    *gpbcon &= ~();

    *gpbcon |= ;

    *gpbdat &= ~; //关闭背光

    *gpgcon |= (<<); 

    /* 根据lcd手册 配置lcd控制器 */

    lcd_reg = ioremap(0x4d000000, sizeof(struct lcd_regs));

    /*

     * VCLK = HCLK / ((CLKVAL+1)*2)

     *

     * */

    lcd_reg->lcdcon1 = (<<)|(<<)|(0x0c<<);

    /*

     * 垂直方向的时间参数

    * VBPD      是VSYNC之后再过多长时间才能发出第一行数据

    * LINEVAL   多少行数据 320

    * VFPD      发出最后一行数据之后过多久才发出VSYNC信号

    * VSPW      VSYNC信号的脉冲宽度

    * */

    lcd_reg->lcdcon2 = (<<)|(<<)|(<<)|();

    /*

    *  水平方向的时间参数

    *  HBPD     是HSYNC之后再过多长时间才能发出第一个像素数据

    *  HOZVAL   有多少列

    *  HFPD     发出一行的最后一个数据后再过多长时间发出HSYNC信号

    *  HSPW     HSYNC信号的脉冲宽度

    * */

    lcd_reg->lcdcon3 = (<<) | (<<) | (<<);

    lcd_reg->lcdcon4 = ;

    /*

    * 信号的极性

    * bits[11] format for 565

    * bits[10] 上升沿有效

    * bits[9]  HSYNC信号反转

    * bits[8]  VSYNC信号反转

    * bits[7]  数据

    * bits[6]  VDEN

    * bits[3]  PWREN

    * */

    lcd_reg->lcdcon5 = (<<) | (<<) | (<<) | (<<);

    /* 分配显存 */

    s3c_fb->screen_base = dma_alloc_writecombine(NULL, s3c_fb->fix.smem_len, &s3c_fb->fix.smem_start,GFP_KERNEL );

    lcd_reg->lcdsaddr1 = (s3c_fb->fix.smem_start >> ) & ~(<<);

    lcd_reg->lcdsaddr2 = ((s3c_fb->fix.smem_start + s3c_fb->fix.smem_len)>>) & 0x1fffff;

    lcd_reg->lcdsaddr3 = (*/); /* 1行的长度  单位是2字节*/

    /**/

    lcd_reg->lcdcon1 |= ;      /*使能LCD控制器*/

    lcd_reg->lcdcon5 |= (<<);   /* 使能LCD */

    *gpbdat |= ;               /*使能背光*/

    /* 注册 */

    register_framebuffer(s3c_fb);

    return ;

}

static void lcd_exit( void )

{

    unregister_framebuffer(s3c_fb);

    lcd_reg->lcdcon1 &= ~;

    *gpbdat &= ~;

    dma_free_writecombine(NULL,s3c_fb->fix.smem_len,s3c_fb->screen_base,s3c_fb->fix.smem_start);

    iounmap(lcd_reg);

    iounmap(gpbcon);

    iounmap(gpccon);

    iounmap(gpdcon);

    iounmap(gpgcon);

    framebuffer_release(s3c_fb);

}

module_init(lcd_init);

module_exit(lcd_exit);

MODULE_LICENSE("GPL");