S5PV210(TQ210)学习笔记——LCD驱动编写

网上S5PV210内核移植的文章不是很多，而描述2440和6410内核移植的文章多数是讲如何移植，而非手动编写，但是，韦东山老师的视频中讲述了如何从头编写LCD驱动，当然是以2440为例的，我看过视频之后在TQ210平台上进行了实验，实验成功，详细的原理部分以我现在的水平还难以表达清楚。下载是我自己写的代码，适用于TQ210的7寸电容屏。

1. #include
2. #include
3. #include
4. #include
7. staticstructfb_info*lcd_info;
8. unsignedlongpseudo_palette[16];
10. unsignedlong*display_control;
12. volatileunsignedlong*gpf0con;
13. volatileunsignedlong*gpf1con;
14. volatileunsignedlong*gpf2con;
15. volatileunsignedlong*gpf3con;
16. volatileunsignedlong*gpd0con;
17. volatileunsignedlong*gpd0dat;
18. volatileunsignedlong*vidcon0;
19. volatileunsignedlong*vidcon1;
20. volatileunsignedlong*vidtcon0;
21. volatileunsignedlong*vidtcon1;
22. volatileunsignedlong*vidtcon2;
23. volatileunsignedlong*wincon0;
24. volatileunsignedlong*vidosd0a;
25. volatileunsignedlong*vidosd0b;
26. volatileunsignedlong*vidosd0c;
27. volatileunsignedlong*vidw00add0b0;
28. volatileunsignedlong*vidw00add1b0;
29. volatileunsignedlong*shodowcon;
31. structclk*lcd_clk;
34. staticinlineunsignedintchan_to_field(unsignedintchan,structfb_bitfield*bf)
35. {
36. chan&=0xffff;
37. chan>>=16-bf->length;
38. returnchanoffset;
39. }
41. staticintlcdfb_setcolreg(unsignedintregno,unsignedintred,
42. unsignedintgreen,unsignedintblue,
43. unsignedinttransp,structfb_info*info)
44. {
45. unsignedintval;
47. if(regno>16)
48. return1;
50. /*用red,green,blue三原色构造出val*/
51. val=chan_to_field(red,&info->var.red);
52. val|=chan_to_field(green,&info->var.green);
53. val|=chan_to_field(blue,&info->var.blue);
55. //((u32*)(info->pseudo_palette))[regno]=val;
56. pseudo_palette[regno]=val;
57. return0;
58. }
60. staticstructfb_opslcd_fbops={
61. .owner=THIS_MODULE,
62. .fb_setcolreg=lcdfb_setcolreg,
63. .fb_fillrect=cfb_fillrect,
64. .fb_copyarea=cfb_copyarea,
65. .fb_imageblit=cfb_imageblit,
66. };
68. staticintlcd_init(void){
69. intret;
71. /*分配fb_info*/
72. lcd_info=framebuffer_alloc(0,NULL);
73. if(lcd_info==NULL){
74. printk(KERN_ERR"allocframebufferfailed!");
75. return-ENOMEM;
76. }
78. /*配置fb_info各成员*/
79. /*fix*/
80. strcpy(lcd_info->fix.id,"s5pv210_lcd");
81. lcd_info->fix.smem_len=800*480*4;
82. lcd_info->fix.type=FB_TYPE_PACKED_PIXELS;
83. lcd_info->fix.visual=FB_VISUAL_TRUECOLOR;
84. lcd_info->fix.line_length=800*4;
86. /*var*/
87. lcd_info->var.xres=800;
88. lcd_info->var.yres=480;
89. lcd_info->var.xres_virtual=800;
90. lcd_info->var.yres_virtual=480;
91. lcd_info->var.bits_per_pixel=32;
93. lcd_info->var.red.offset=16;
94. lcd_info->var.red.length=8;
95. lcd_info->var.green.offset=8;
96. lcd_info->var.green.length=8;
97. lcd_info->var.blue.offset=0;
98. lcd_info->var.blue.length=8;
99. lcd_info->var.activate=FB_ACTIVATE_NOW;
101. lcd_info->screen_size=800*480*4;
102. lcd_info->pseudo_palette=pseudo_palette;
104. lcd_info->fbops=&lcd_fbops;
105. /*配置硬件资源*/
106. /*映射内存*/
107. display_control=ioremap(0xe0107008,4);
108. gpf0con=ioremap(0xE0200120,4);
109. gpf1con=ioremap(0xE0200140,4);
110. gpf2con=ioremap(0xE0200160,4);
111. gpf3con=ioremap(0xE0200180,4);
113. gpd0con=ioremap(0xE02000A0,4);
114. gpd0dat=ioremap(0xE02000A4,4);
116. vidcon0=ioremap(0xF8000000,4);
117. vidcon1=ioremap(0xF8000004,4);
118. vidtcon0=ioremap(0xF8000010,4);
119. vidtcon1=ioremap(0xF8000014,4);
120. vidtcon2=ioremap(0xF8000018,4);
121. wincon0=ioremap(0xF8000020,4);
122. vidosd0a=ioremap(0xF8000040,4);
123. vidosd0b=ioremap(0xF8000044,4);
124. vidosd0c=ioremap(0xF8000048,4);
125. vidw00add0b0=ioremap(0xF80000A0,4);
126. vidw00add1b0=ioremap(0xF80000D0,4);
127. shodowcon=ioremap(0xF8000034,4);
129. /*配置GPIO*/
130. *gpf0con=0x22222222;
131. *gpf1con=0x22222222;
132. *gpf2con=0x22222222;
133. *gpf3con=0x22222222;
134. *gpd0con&=~0xf;
135. *gpd0con|=0x1;
136. *gpd0dat|=1<0;
137. *display_control=2<0;
138. /*使能时钟*/
139. lcd_clk=clk_get(NULL,"lcd");
140. if(!lcd_clk||IS_ERR(lcd_clk)){
141. printk(KERN_INFO"failedtogetlcdclocksource");
142. }
143. clk_enable(lcd_clk);
145. /*配置LCD控制器*/
146. *vidcon0=(4<6)|(1<4);
147. *vidcon1=(1<6)|(1<5)|(1<4);
149. *vidtcon0=(17<16)|(26<8)|(4<0);
150. *vidtcon1=(40<16)|(214<8)|(4<0);
151. *vidtcon2=(479<11)|(799<0);
153. *wincon0&=~(0xf<2);
154. *wincon0|=(0xb<2);
156. *vidosd0a=(0<11)|(0<0);
157. *vidosd0b=(799<11)|(479<0);
158. *vidosd0c=480*800;
159. //物理地址
160. lcd_info->lcd_info->scree