1 int __init s3c_fb_probe(struct platform_device *pdev)
2 {
3 char driver_name[]="s3c_fb";
4 int ret;
5 int index=0;
6
7 for(index=0; index<S3C_FB_NUM; index++){ //遍历每一个fb,我们里只有一个lcd.
8 s3c_fb_init_fbinfo(&info[index], driver_name, index);
9
10 if(index==0){ //操作主lcd
11 s3c_fb_backlight_power(1); //开启背光，lcd电源源，开启背光等。
12 s3c_fb_lcd_power(1);
13 s3c_fb_backlight_level(DEFAULT_BACKLIGHT_LEVEL);
14
15 dprintk("dev FB init\n");
16
17 //映射内存区域
18 if (!request_mem_region((unsigned long)S3C_VA_LCD, SZ_1M, "s3c-lcd")) {
19 ret = -EBUSY;
20 goto dealloc_fb;
21 }
22
23 dprintk("got LCD region\n");
24
25 //打开lcd_clock
26 lcd_clock = clk_get(NULL, "lcd");
27 if (!lcd_clock) {
28 printk(KERN_INFO "failed to get lcd clock source\n");
29 ret = -ENOENT;
30 goto release_irq;
31 }
32
33 clk_enable(lcd_clock);
34 printk("S3C_LCD clock got enabled :: %ld.%03ld Mhz\n", print_mhz(clk_get_rate(lcd_clock)));
35
36 msleep(5);
37 }
38
39 //申请显存
40 /* Initialize video memory */
41 ret = s3c_fb_map_video_memory(&info[index]);
42 if (ret) {
43 printk("Failed to allocate video RAM: %d\n", ret);
44 ret = -ENOMEM;
45 goto release_clock;
46 }
47 dprintk("got video memory\n");
48
49 //初始化寄存器，这里与具体的设备有关。
50 ret = s3c_fb_init_registers(&info[index]);
51 ret = s3c_fb_check_var(&info[index].fb.var, &info[index].fb);
52
53 //所谓的色表（调色盘？），不清除是干啥的。
54 if(index<2){
55 /* 2007-01-09-Tue. for RGB 8-8-8 palette*/
56 if(fb_alloc_cmap(&info[index].fb.cmap, 256, 0)<0){
57 goto dealloc_fb;
58 }
59 }
60 else{
61 /* 2007-01-09-Tue. for RGB 8-8-8 palette*/
62 if(fb_alloc_cmap(&info[index].fb.cmap, 16, 0)<0){
63 goto dealloc_fb;
64 }
65 }
66 //注册framebuffer??
67 ret = register_framebuffer(&info[index].fb);
68 if (ret < 0) {
69 printk(KERN_ERR "Failed to register framebuffer device: %d\n", ret);
70 goto free_video_memory;
71 }
72 }// for(index=0; index<CONFIG_FB_NUM; index++)
73
74 // initialize the struct for Waitforvsync
75 // 关于中断的初始化工作，貌似2412是注册以后又取消了
76 s3cfb_vSyncInfo.count = 0;
77 init_waitqueue_head(&s3cfb_vSyncInfo.waitQueue);
78
79 #if defined(CONFIG_ARCH_S3C2443)
80 ret = request_irq(IRQ_LCD3, s3c_fb_irq, 0, "s3c-lcd", pdev);
81 #elif defined(CONFIG_ARCH_S3C6400)
82 ret = request_irq(IRQ_LCD_VSYNC, s3c_fb_irq, 0, "s3c-lcd", pdev);
83 #elif defined (CONFIG_S3C_DVS) && defined (CONFIG_ARCH_S3C2412)
84 ret = request_irq(IRQ_LCD, s3c_dvs_irq, 0, "s3c-lcd", pdev);
85 #endif
86 if (ret != 0) {
87 printk("Failed to install irq (%d)\n", ret);
88 goto release_irq;
89 }
90
91 #if defined (CONFIG_S3C_DVS) & defined (CONFIG_ARCH_S3C2412)
92 disable_irq(IRQ_LCD);
93 #endif
94
95 //在sys底下建立节点，用于和用户空间交互
96 /* create device files */
97 device_create_file(&(pdev->dev), &dev_attr_backlight_power);
98 device_create_file(&(pdev->dev), &dev_attr_backlight_level);
99 device_create_file(&(pdev->dev), &dev_attr_lcd_power);
100
101 //胜利退出
102 printk(KERN_INFO "fb%d: %s frame buffer device\n",
103 info[index].fb.node, info[index].fb.fix.id);
104 return 0;
105
106 free_video_memory:
107 s3c_fb_unmap_video_memory(&info[index]);
108
109 release_clock:
110 clk_disable(lcd_clock);
111 clk_put(lcd_clock);
112
113 release_irq:
114 #if defined(CONFIG_ARCH_S3C2443)
115 free_irq(IRQ_LCD3, &info);
116 #elif defined(CONFIG_ARCH_S3C6400)
117 free_irq(IRQ_LCD_VSYNC, &info);
118 #endif
119 //release_mem:
120 release_mem_region((unsigned long)S3C_VA_LCD, S3C_SZ_LCD);
121
122 dealloc_fb:
123 framebuffer_release(&info[index].fb);
124 return ret;
125 }
126
127
128