参照裸机测试程序写的linux下lcd的驱动（仅用于显示一幅图片）求助~~~

初学驱动~试着写了下面的程序
insmod qiao_lcd.ko   后屏幕黑屏了  只能说有反应
运行测试程序后写数据成功了，但是没显示图片

求指导~~~
驱动程序如下：

1. 
   
2. #include <linux/module.h>
   
3. #include <linux/kernel.h>
   
4. #include <linux/fs.h>
   
5. #include <linux/init.h>
   
6. #include <linux/delay.h>
   
7. #include <linux/poll.h>
   
8. #include <asm/irq.h>
   
9. #include <asm/io.h>
   
10. #include <linux/interrupt.h>
    
11. #include <asm/uaccess.h>
    
12. #include <mach/regs-gpio.h>
    
13. #include <mach/hardware.h>
    
14. #include <plat/regs-timer.h>
    
15. #include <mach/regs-irq.h>
    
16. #include <mach/regs-lcd.h>
    
17. #include <asm/mach/time.h>
    
18. #include <linux/clk.h>
    
19. #include <linux/cdev.h>
    
20. #include <linux/device.h>
    
21. #include <linux/miscdevice.h>
    
22. 
    
23. #define DEVICE_NAME "qiao_lcd"
    
24. 
    
25. #define MVAL  (13)
    
26. #define MVAL_USED  (0)   //0=each frame   1=rate by MVAL
    
27. #define INVVDEN  (1)   //0=normal       1=inverted
    
28. #define BSWP  (0)   //Byte swap control
    
29. #define HWSWP  (1)   //Half word swap control
    
30. #define PNRMODE  (3)   // 设置为TFT屏
    
31. #define BPPMODE  (12)   // 设置为16bpp模式
    
32. //TFT_SIZE
    
33. #define LCD_XSIZE_TFT  (480)
    
34. #define LCD_YSIZE_TFT  (272)
    
35. #define SCR_XSIZE_TFT  (480)
    
36. #define SCR_YSIZE_TFT  (272)
    
37. //Timing parameter for 4.3' LCD
    
38. #define VBPD   (2)   //垂直同步信号的后肩
    
39. #define VFPD   (4)   //垂直同步信号的前肩
    
40. #define VSPW   (8)   //垂直同步信号的脉宽
    
41. #define HBPD   (10)   //水平同步信号的后肩
    
42. #define HFPD   (19)   //水平同步信号的前肩
    
43. #define HSPW   (30)   //水平同步信号的脉宽
    
44. #define CLKVAL_TFT  (4)  
    
45. #define HOZVAL_TFT (LCD_XSIZE_TFT-1)
    
46. #define LINEVAL_TFT (LCD_YSIZE_TFT-1)
    
47. 
    
48. #define M5D(n)    ((n) & 0x1fffff) // To get lower 21bits
    
49. 
    
50. #undef DEBUG
    
51. #define DEBUG
    
52. #ifdef DEBUG
    
53. #define PRINTK(fmt, args...) printk("debug information: " fmt, ## args)
    
54. #else
    
55. #define PRINTK(fmt, args...)
    
56. #endif
    
57. 
    
58. static void *LCD_BUFFER;
    
59. static void __iomem *p;
    
60. 
    
61. static ssize_t lcd_write (struct file *file, const char __user *buff, size_t count, loff_t *offp)
    
62. {
    
63. ssize_t ret;
    
64. ret = copy_from_user(LCD_BUFFER,buff,count);
    
65. if(!ret) printk( KERN_ERR "driver write success!\n");
    
66. else
    
67. {
    
68.   printk( KERN_ERR "write faild bytes = %d",ret);
    
69.   return ret;
    
70. }
    
71. return ret;
    
72. }
    
73. 
    
74. struct file_operations fops={
    
75. .owner = THIS_MODULE,
    
76. .write = lcd_write,
    
77. };
    
78. 
    
79. struct miscdevice misc={
    
80. .minor = MISC_DYNAMIC_MINOR,
    
81. .name = DEVICE_NAME,
    
82. .fops = &fops,
    
83. };
    
84. 
    
85. static int __init qiao_lcd_init(void)
    
86. {
    
87. int ret;
    
88. p = ioremap(0x4d000000, 0x63);
    
89. PRINTK("p = %x \n", p);
    
90. LCD_BUFFER = kmalloc(SCR_YSIZE_TFT * SCR_XSIZE_TFT * 2 ,GFP_KERNEL);
    
91. PRINTK("LCD_BUFFER = %x \n", LCD_BUFFER);
    
92. __raw_writel(0x00000000,S3C2410_GPCUP);
    
93. __raw_writel(0xaaaa02a9,S3C2410_GPCCON);
    
94. __raw_writel(0x00000000,S3C2410_GPDUP);
    
95. __raw_writel(0xaaaaaaaa,S3C2410_GPDCON);
    
96. 
    
97. __raw_writel((CLKVAL_TFT<<8)|(MVAL_USED<<7)|(3<<5)|(12<<1)|0,p+S3C2410_LCDCON1);
    
98. PRINTK("p+S3C2410_LCDCON1 = %x \n", readl(p+S3C2410_LCDCON1));
    
99. __raw_writel((VBPD<<24)|(LINEVAL_TFT<<14)|(VFPD<<6)|(VSPW),p+S3C2410_LCDCON2);
    
100. __raw_writel((HBPD<<19)|(HOZVAL_TFT<<8)|(HFPD),p+S3C2410_LCDCON3);
     
101. __raw_writel((MVAL<<8)|(HSPW),p+S3C2410_LCDCON4);
     
102. __raw_writel((1<<11) | (0<<10) | (1<<9) | (1<<8) | (0<<7) | (0<<6) | (1<<3)  |(BSWP<<1) | (HWSWP),p+S3C2410_LCDCON5);
     
103. __raw_writel((((unsigned long)LCD_BUFFER>>22)<<21)|M5D((unsigned long)LCD_BUFFER>>1),p+S3C2410_LCDSADDR1);
     
104. __raw_writel(M5D( ((unsigned long)LCD_BUFFER+(SCR_XSIZE_TFT*LCD_YSIZE_TFT*2))>>1 ),p+S3C2410_LCDSADDR2);
     
105. __raw_writel((((SCR_XSIZE_TFT-LCD_XSIZE_TFT)/1)<<11)|(LCD_XSIZE_TFT/1),p+S3C2410_LCDSADDR3);
     
106. __raw_writel(__raw_readl(p+S3C2410_LCDINTMSK)|(3),p+S3C2410_LCDINTMSK);
     
107. __raw_writel(__raw_readl(p+S3C2410_LPCSEL)&(~7),p+S3C2410_LPCSEL);
     
108. __raw_writel(0,p+S3C2410_LCDREG(0x50));
     
109. 
     
110. __raw_writel(__raw_readl(S3C2410_GPGUP)&(~(1<<4))|(1<<4),S3C2410_GPGUP);
     
111. __raw_writel(__raw_readl(S3C2410_GPGCON)&(~(3<<8))|(3<<8),S3C2410_GPGCON);
     
112. __raw_writel(__raw_readl(S3C2410_GPGDAT) | (1<<4),S3C2410_GPGDAT);
     
113. 
     
114. __raw_writel(__raw_readl(p+S3C2410_LCDCON5)&(~(1<<3))|(1<<3),p+S3C2410_LCDCON5);
     
115. __raw_writel(__raw_readl(p+S3C2410_LCDCON5)&(~(1<<5))|(0<<5),p+S3C2410_LCDCON5);
     
116. 
     
117. __raw_writel(__raw_readl(p+S3C2410_LCDCON1) | (1),p+S3C2410_LCDCON1);
     
118. PRINTK("p+S3C2410_LCDCON1 = %x \n", readl(p+S3C2410_LCDCON1));
     
119. PRINTK("p+S3C2410_LCDCON2 = %x \n", readl(p+S3C2410_LCDCON2));
     
120. PRINTK("p+S3C2410_LCDCON3 = %x \n", readl(p+S3C2410_LCDCON3));
     
121. PRINTK("p+S3C2410_LCDCON4 = %x \n", readl(p+S3C2410_LCDCON4));
     
122. PRINTK("p+S3C2410_LCDCON5 = %x \n", readl(p+S3C2410_LCDCON5));
     
123. ret = misc_register(&misc);
     
124. if(! ret) printk(DEVICE_NAME "initialized\n");
     
125. return ret;
     
126. }
     
127. 
     
128. static void __exit qiao_lcd_exit(void)
     
129. {
     
130. misc_deregister(&misc);
     
131. }
     
132. 
     
133. module_init(qiao_lcd_init);
     
134. module_exit(qiao_lcd_exit);
     
135. 
     
136. MODULE_LICENSE("GPL");
     
137. MODULE_AUTHOR("qiao");
     
138. MODULE_DESCRIPTION("qiao_lcd_driver");
     

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测试程序如下：

1. #include <stdio.h>
   
2. #include <stdlib.h>
   
3. #include <unistd.h>
   
4. #include <sys/ioctl.h>
   
5. #include <sys/stat.h>
   
6. #include <fcntl.h>
   
7. #include "meimei.h"
   
8. int main()
   
9. {
   
10. int fd;
    
11. long ret;
    
12. fd = open("/dev/qiao_lcd", 2);
    
13. if (fd < 0)
    
14. {
    
15. printf("open device qiao_lcd faild");
    
16. exit(1);
    
17. }
    
18. 
    
19. ret = write(fd,&gImage_meimei,sizeof(gImage_meimei));
    
20. if(!ret) printf("test successfully!\n");
    
21. else
    
22. {
    
23. printf("bytes filed number is %d",ret);
    
24. }
    
25. close(fd);
    
26. return 0;
    
27. }
    

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解决了~~~
        vi_lcd_buffer = __get_free_pages(GFP_KERNEL ,6);
        //vi_lcd_buffer = kmalloc( LCD_XSIZE_TFT * LCD_YSIZE_TFT * 2,GFP_KERNEL);
返回的还不是硬件的物理地址
要：LCD_BUFFER = virt_to_phys(vi_lcd_buffer);后才是