韦东山linux视频第10个例子对应的 TQ2440 7.0寸lcd程序代码
1.视频现成的例子只有tq2440对应该的4.3寸LCD的驱动代码.但我手上是TQ2440 7.0寸LCD的屏,所以我对照7.0屏的手册 ,改了一下参数可以用.
使用TQ2440, 驱动7.0寸屏的程序例子里面的设置LCD参数也可以用, 有点想不明白先.
反正下面两种设置都可以用.
#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 int s3c_lcdfb_setcolreg(unsigned int regno, unsigned int red,
unsigned int green, unsigned int blue,
unsigned int transp, struct fb_info *info);
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 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 struct fb_info *s3c_lcd;
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 volatile struct lcd_regs* lcd_regs;
static u32 pseudo_palette[16];
/* from pxafb.c */
static inline unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
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;
return 0;
}
static int lcd_init(void)
{
/* 1. 分配一个fb_info */
s3c_lcd = framebuffer_alloc(0, NULL);
/* 2. 设置 */
/* 2.1 设置固定的参数 */
strcpy(s3c_lcd->fix.id, "mylcd");
//s3c_lcd->fix.smem_len = 480*272*32/8; /* TQ2440的LCD位宽是24,但是2440里会分配4字节即32位(浪费1字节) */
s3c_lcd->fix.smem_len = 800*480*32/8;
s3c_lcd->fix.type = FB_TYPE_PACKED_PIXELS;
s3c_lcd->fix.visual = FB_VISUAL_TRUECOLOR; /* TFT */
//s3c_lcd->fix.line_length = 480*4;
s3c_lcd->fix.line_length = 800*4;
/* 2.2 设置可变的参数 */
//s3c_lcd->var.xres = 480;
s3c_lcd->var.xres = 800;
//s3c_lcd->var.yres = 272;
s3c_lcd->var.yres = 480;
//s3c_lcd->var.xres_virtual = 480;
s3c_lcd->var.xres_virtual = 800;
//s3c_lcd->var.yres_virtual = 272;
s3c_lcd->var.yres_virtual = 480;
//s3c_lcd->var.bits_per_pixel = 32;
s3c_lcd->var.bits_per_pixel = 32;
/* RGB:565 */
s3c_lcd->var.red.offset = 16;
s3c_lcd->var.red.length = 8;
s3c_lcd->var.green.offset = 8;
s3c_lcd->var.green.length = 8;
s3c_lcd->var.blue.offset = 0;
s3c_lcd->var.blue.length = 8;
s3c_lcd->var.activate = FB_ACTIVATE_NOW;
/* 2.3 设置操作函数 */
s3c_lcd->fbops = &s3c_lcdfb_ops;
/* 2.4 其他的设置 */
s3c_lcd->pseudo_palette = pseudo_palette;
//s3c_lcd->screen_base = ; /* 显存的虚拟地址 */
//s3c_lcd->screen_size = 480*272*32/8;
s3c_lcd->screen_size = 800*480*32/8;
/* 3. 硬件相关的操作 */
/* 3.1 配置GPIO用于LCD */
gpbcon = ioremap(0x56000010, 8);
gpbdat = gpbcon+1;
gpccon = ioremap(0x56000020, 4);
gpdcon = ioremap(0x56000030, 4);
gpgcon = ioremap(0x56000060, 4);
*gpccon = 0xaaaaaaaa; /* 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] */
// *gpbcon &= ~(3); /* GPB0设置为输出引脚 */
// *gpbcon |= 1;
// *gpbdat &= ~1; /* 输出低电平 */
*gpgcon |= (3<<8); /* GPG4用作LCD_PWREN */
/* 3.2 根据LCD手册设置LCD控制器, 比如VCLK的频率等 */
lcd_regs = ioremap(0x4D000000, sizeof(struct lcd_regs));
/*
* TQ2440 4.3英寸LCD手册为WXCAT43-TG6#001_V1.0.pdf第22、23页
*
* LCD手册和2440手册"Figure 15-6. TFT LCD Timing Example"一对比就知道参数含义了
*/
/* bit[17:8]: VCLK = HCLK / [(CLKVAL+1) x 2], LCD手册P22 (Dclk=9MHz~15MHz)
* 10MHz(100ns) = 100MHz / [(CLKVAL+1) x 2]
* CLKVAL = 4
* bit[6:5]: 0b11, TFT LCD
* bit[4:1]: 0b1101, 24 bpp for TFT
* bit[0] : 0 = Disable the video output and the LCD control signal.
*/
//lcd_regs->lcdcon1 = (4<<8) | (3<<5) | (0x0c<<1); //对于TQ2440 7.0寸LCD手册上的参数设置的
lcd_regs->lcdcon1 = (2<<8) | (3<<5) | (0x0d<<1); //TQ2440 7.0寸LCD程序设置的. 有疑问的是这两个设置都可以用.
/* 垂直方向的时间参数
* bit[31:24]: VBPD, VSYNC之后再过多长时间才能发出第1行数据
* LCD手册 tvb=2 (29 )
* VBPD=1
* bit[23:14]: 多少行, 272 (480), 所以LINEVAL=272-1=271
* bit[13:6] : VFPD, 发出最后一行数据之后，再过多长时间才发出VSYNC
* LCD手册tvf=2 (13), 所以VFPD=2-1=1
* bit[5:0] : VSPW, VSYNC信号的脉冲宽度, LCD手册tvp=10 (3), 所以VSPW=10-1=9
*/
//lcd_regs->lcdcon2 = (28<<24) | (479<<14) | (12<<6) | (2<<0);//对于TQ2440 7.0寸LCD手册上的参数设置的
lcd_regs->lcdcon2 = (4<<24) | (479<<14) | (2<<6) | (2<<0);//TQ2440 7.0寸LCD程序设置的,有疑问的是这两个设置都可以用.
/* 水平方向的时间参数
* bit[25:19]: HBPD, VSYNC之后再过多长时间才能发出第1行数据
* LCD手册 thb=2(40))
* HBPD=1
* bit[18:8]: 多少列, 480, 所以HOZVAL=480-1=479 (480))
* bit[7:0] : HFPD, 发出最后一行里最后一个象素数据之后，再过多长时间才发出HSYNC
* LCD手册thf=2, 所以HFPD=2-1=1 (40))
*/
//lcd_regs->lcdcon3 = (1<<19) | (479<<8) | (1<<0);
//lcd_regs->lcdcon3 = (39<<19) | (799<<8) | (39<<0); //对于TQ2440 7.0寸LCD手册上的参数设置的
lcd_regs->lcdcon3 = (27<<19) | (799<<8) | (14<<0); //TQ2440 7.0寸LCD程序设置的,有疑问的是这两个设置都可以用.
/* 水平方向的同步信号
* bit[7:0] : HSPW, HSYNC信号的脉冲宽度, LCD手册Thp=41, 所以HSPW=41-1=40 (48))
*/
//lcd_regs->lcdcon4 = 40; //对于TQ2440 7.0寸LCD手册上的参数设置的
lcd_regs->lcdcon4 = 8; //TQ2440 7.0寸LCD程序设置的,有疑问的是这两个设置都可以用.
/* 信号的极性
* bit[11]: 1=565 format, 对于24bpp这个不用设
* bit[10]: 0 = The video data is fetched at VCLK falling edge
* bit[9] : 1 = HSYNC信号要反转,即低电平有效
* bit[8] : 1 = VSYNC信号要反转,即低电平有效
* bit[6] : 0 = VDEN不用反转
* bit[3] : 0 = PWREN输出0
*
* BSWP = 0, HWSWP = 0, BPP24BL = 0 : 当bpp=24时,2440会给每一个象素分配32位即4字节,哪一个字节是不使用的? 看2440手册P412
* bit[12]: 0, LSB valid, 即最高字节不使用
* bit[1] : 0 = BSWP
* bit[0] : 0 = HWSWP
*/
lcd_regs->lcdcon5 = (0<<10) | (1<<9) | (1<<8) | (0<<12) | (0<<1) | (0<<0);
/* 3.3 分配显存(framebuffer), 并把地址告诉LCD控制器 */
s3c_lcd->screen_base = dma_alloc_writecombine(NULL, s3c_lcd->fix.smem_len, &s3c_lcd->fix.smem_start, GFP_KERNEL);
lcd_regs->lcdsaddr1 = (s3c_lcd->fix.smem_start >> 1) & ~(3<<30);
lcd_regs->lcdsaddr2 = ((s3c_lcd->fix.smem_start + s3c_lcd->fix.smem_len) >> 1) & 0x1fffff;
//lcd_regs->lcdsaddr3 = (480*32/16); /* 一行的长度(单位: 2字节) */
lcd_regs->lcdsaddr3 = (800*32/16); /* 一行的长度(单位: 2字节) */
//s3c_lcd->fix.smem_start = xxx; /* 显存的物理地址 */
/* 启动LCD */
lcd_regs->lcdcon1 |= (1<<0); /* 使能LCD控制器 */
lcd_regs->lcdcon5 |= (1<<3); /* 使能LCD本身: LCD_PWREN */
// *gpbdat |= 1; /* 输出高电平, 使能背光, TQ2440的背光电路也是通过LCD_PWREN来控制的 */
/* 4. 注册 */
register_framebuffer(s3c_lcd);
return 0;
}
static void lcd_exit(void)
{
unregister_framebuffer(s3c_lcd);
lcd_regs->lcdcon1 &= ~(1<<0); /* 关闭LCD控制器 */
lcd_regs->lcdcon1 &= ~(1<<3); /* 关闭LCD本身 */
// *gpbdat &= ~1; /* 关闭背光 */
dma_free_writecombine(NULL, s3c_lcd->fix.smem_len, s3c_lcd->screen_base, s3c_lcd->fix.smem_start);
iounmap(lcd_regs);
iounmap(gpbcon);
iounmap(gpccon);
iounmap(gpdcon);
iounmap(gpgcon);
framebuffer_release(s3c_lcd);
}
module_init(lcd_init);
module_exit(lcd_exit);
MODULE_LICENSE("GPL");