#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/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
static struct fb_info *s3c_lcd_info;
static u32 s3c_pseudo_palette[16];
static volatile unsigned long *gpbcon;
static volatile unsigned long *gpbdat;
static volatile unsigned long *gpfcon;
static volatile unsigned long *gpfdat;
static volatile unsigned long *gpicon;
static volatile unsigned long *gpjcon;
static volatile unsigned long *mifpcon;
static volatile unsigned long *spcon;
一个一个ioremap 太麻烦，统一放一结构里面,从6410的芯片手册上得到以下的寄存器P455
struct s3c6410_lcd_regs {
unsigned long vidcon0; //视频时钟源
unsigned long vidcon1;
unsigned long vidcon2;
unsigned long reserver1;
unsigned long vidtcon0;
unsigned long vidtcon1;
unsigned long vidtcon2;
unsigned long reserver2;
unsigned long wincon0;
unsigned long wincon1;
unsigned long wincon2;
unsigned long wincon3;
unsigned long wincon4;
unsigned long reserver3[3];
unsigned long vidosd0a;
unsigned long vidosd0b;
unsigned long vidosd0c;
unsigned long reserver4;
unsigned long vidosd1a;
unsigned long vidosd1b;
unsigned long vidosd1c;
unsigned long vidosd1d;
unsigned long vidosd2a;
unsigned long vidosd2b;
unsigned long vidosd2c;
unsigned long vidosd2d;
unsigned long vidosd3a;
unsigned long vidosd3b;
unsigned long vidosd3c;
unsigned long reserver5;
unsigned long vidosd4a;
unsigned long vidosd4b;
unsigned long vidosd4c;
unsigned long reserver6[5];
unsigned long vidw00add0b0;
unsigned long vidw00add0b1;
unsigned long vidw01add0b0;
unsigned long vidw01add0b1;
unsigned long vidw02add0;
unsigned long reserver7;
unsigned long vidw03add0;
unsigned long reserver8;
unsigned long vidw04add0;
unsigned long reserver9[3];
unsigned long vidw00add1b0;
unsigned long vidw00add1b1;
};
static int s3c_fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
u_int transp, struct fb_info *info)
{
u32 color = 0;
u32 *p;
/* 0xRRGGBB */
/* red = 0xAABB
* green = 0xCCDD
* blue = 0xEEFF
* color = 0xAACCEE
*/
red = (red >> (16 - info->var.red.length)) << info->var.red.offset; // 0xAA0000
green = (green >> (16 - info->var.green.length)) << info->var.green.offset; // 0xCC00
blue = (blue >> (16 - info->var.blue.length)) << info->var.blue.offset; // 0xEE
color = red | green | blue; // 0xAACCEE
p = info->pseudo_palette;
p[regno] = color;
return 0;
}
static struct fb_ops s3c_fb_ops = {
.fb_setcolreg = s3c_fb_setcolreg,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
static struct s3c6410_lcd_regs * lcd_regs;
static int s3c_lcd_init(void)
{
struct clk *clk;
int hclk;
int clkval;
/* 1. 分配fb_info */
s3c_lcd_info = framebuffer_alloc(0, NULL);
/* 2. 设置 */
/* 2.1 设置固定的信息,在fb_info 结构体里的fix*/
strcpy(s3c_lcd_info->fix.id, "uplooking_lcd");
// s3c_lcd_info->fix.smem_start /* 显存物理地址 */
s3c_lcd_info->fix.smem_len = 480*272*32/8;//看lcd手册，4位
s3c_lcd_info->fix.type = FB_TYPE_PACKED_PIXELS;//在fb.h里的FB_TYPE里第一个
s3c_lcd_info->fix.visual = FB_VISUAL_TRUECOLOR; //TFT屏是真彩色
s3c_lcd_info->fix.line_length = 480*32/8; //480乘以272，一个像素4位
/* 2.2 设置可变的信息,fb_info结构体的var */
s3c_lcd_info->var.xres = 480;
s3c_lcd_info->var.yres = 272;
s3c_lcd_info->var.xres_virtual = 480;
s3c_lcd_info->var.yres_virtual = 272;
s3c_lcd_info->var.bits_per_pixel = 32; //每个像素用多少位
// 0xRRGGBB
s3c_lcd_info->var.red.length = 8;
s3c_lcd_info->var.red.offset = 16; //从16位开始，长度为8
s3c_lcd_info->var.green.length = 8;
s3c_lcd_info->var.green.offset = 8;
s3c_lcd_info->var.blue.length = 8;
s3c_lcd_info->var.blue.offset = 0;
s3c_lcd_info->var.activate = FB_ACTIVATE_NOW;// 看不懂就用默认值为0 的
/* 2.3 设置操作函数 */
s3c_lcd_info->fbops = &s3c_fb_ops;
/* 2.4 设置其他信息 */
//s3c_lcd_info->screen_base = ;/* 显存的虚拟地址 */
s3c_lcd_info->screen_size = 480*272*4;
s3c_lcd_info->pseudo_palette = &s3c_pseudo_palette;//调色板，
/* 4. 硬件相关的操作 */
/* 4.1 配置GPIO用于LCD */
gpicon = ioremap(0x7F008100, 4);
*gpicon = 0xAAAAAAAA;
gpjcon = ioremap(0x7F008120, 4);
*gpjcon = 0xAAAAAAAA;
gpbcon = ioremap(0x7F008020, 4);
gpbdat = gpbcon + 1;
*gpbcon &= ~(0xf<<24);
*gpbcon |= (0x1<<24); /* backlight enable pin */
gpfcon = ioremap(0x7F0080A0, 4);
gpfdat = gpfcon + 1;
*gpfcon &= ~(3<<28);
*gpfcon |= (1<<28); /* GPF14 use as PWREN */
/* 4.2 根据LCD的性能设置LCD控制器 */
/* MIFPCON：.调制解调器接口端口控制寄存器，6410手册要求就要这么设置 */
*mifpcon &= ~(1<<3);
/*spcon：特殊管脚功能寄存器，下面选择01=RGB*/
spcon = ioremap(0x7F0081A0, 4);
*spcon &= ~(3);
*spcon |= 1;
lcd_regs = ioremap(0x77100000, sizeof(struct s3c6410_lcd_regs));
clk = clk_get(NULL, "lcd"); /*struct clk *clk_get(struct device *dev, const char *id)*/
clk_enable(clk); /* HCLK_GATE[3]设为1 */
/*
HCLK_GATE = ioremap(0x7E00F030, 4);
* HCLK_GATE |= (1<<3);
*/
/* bit[13:6], CLKVAL_F,VCLK = Video Clock Source / (CLKVAL+1)=133/15=9MHZ，
VCLK = 9000000
CLKVAL_F = hclk/9000000 - 1=14
* bit[3:2], CLKSEL_F, 00 = HCLK
* bit[1], ENVID-使能LCD控制器的输出, 先设为0, 最后全部设置好了再设为1
*/
clk = clk_get(NULL, "hclk");
hclk = clk_get_rate(clk);
clkval = hclk/9000000 - 1;
printk("hclk = %d, clkval = %d\n", hclk, clkval);
lcd_regs->vidcon0 = (0<<29)|(0<<26) | (0<<17) | (clkval << 6) | (1<<4);
/* bit[7], 0-在VLCK下降沿读数据，通过lcd手册的时序图看是上升还是下降
* bit[6], HSYNC低脉冲有效
* bit[5], VSYNC低脉冲有效
* bit[4], VDEN高电平有效
*/
lcd_regs->vidcon1 = (0<<7) | (1<<6) | (1<<5) | (0<<4);
/* LCD手册P11
* tvp = 10, tvb = 2, tvf=2
*/
lcd_regs->vidtcon0 = (1<<16) | (1<<8) | (9<<0);
/* LCD手册P11
* thp = 41, thb = 2, thf=2
*/
lcd_regs->vidtcon1 = (1<<16) | (1<<8) | (40<<0);
lcd_regs->vidtcon2 = (271<<11) | (479<<0);
/* 4.3 分配显存, 并告诉LCD控制器，专业的函数来分配显存！不用kmalloc！ */
s3c_lcd_info->screen_base = dma_alloc_writecombine(NULL, s3c_lcd_info->screen_size, &s3c_lcd_info->fix.smem_start, GFP_KERNEL);
//void *dma_alloc_writecombine(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t gfp)
/* bit[17],BSWP = 0, bit[16],HWSWP = 0
* bit[5:2],BPPMODE_F, 0b1011, 24bpp
* bit[0], ENWIN_F, 0-先不使能
*/
lcd_regs->wincon0 &= ~(0xf << 2);
lcd_regs->wincon0 |= (0xb<<2); /* unpacked 24 BPP (non-palletized R:8-G:8-B:8 ) */
#define LeftTopX 0
#define LeftTopY 0
#define RightBotX 479
#define RightBotY 271
lcd_regs->vidosd0a = (LeftTopX<<11) | (LeftTopY << 0); //6410手册 P473
lcd_regs->vidosd0b = (RightBotX<<11) | (RightBotY << 0);
lcd_regs->vidosd0c = 480*272*4 / 4;
lcd_regs->vidw00add0b0 = s3c_lcd_info->fix.smem_start; //窗口 0 的缓冲区开始地址控制寄存器，缓冲区 0
lcd_regs->vidw00add1b0 = (s3c_lcd_info->fix.smem_start + s3c_lcd_info->fix.smem_len) & 0xffffff; //窗口 0 的缓冲区结束地址控制寄存器，缓冲区 0
/* 4.4 使能 */
*gpbdat |= (1<<6); /* 使能背光 */
*gpfdat |= (1<<14); /* PWREN，提供电源 */
lcd_regs->vidcon0 |= (3); /* 使能LCD控制器输出信号 */
lcd_regs->wincon0 |= (1<<0); /* 使能窗口0 */
/* 3. 注册 */
register_framebuffer(s3c_lcd_info);
return 0;
}
static void s3c_lcd_exit(void)
{
struct clk *clk;
unregister_framebuffer(s3c_lcd_info);
*gpbdat &= ~(1<<6); /* 禁止背光 */
*gpfdat &= ~(1<<14); /* 禁止PWREN */
lcd_regs->vidcon0 &= ~(1<<1); /* 禁止LCD控制器输出信号 */
lcd_regs->wincon0 &= ~(1<<0); /* 禁止窗口0 */
dma_free_writecombine(NULL, s3c_lcd_info->screen_size, s3c_lcd_info->screen_base, s3c_lcd_info->fix.smem_start);
clk = clk_get(NULL, "lcd");
clk_disable(clk); /* HCLK_GATE[3]设为0 */
iounmap(lcd_regs);
iounmap(gpbcon);
iounmap(gpfcon);
iounmap(gpicon);
iounmap(gpjcon);
iounmap(mifpcon);
iounmap(spcon);
framebuffer_release(s3c_lcd_info);
}
module_init(s3c_lcd_init);
module_exit(s3c_lcd_exit);
MODULE_LICENSE("GPL");