测试：
1：make menuconfig去掉原来的驱动程序
Device Drivers --->
Graphics support --->
<M> S3C2410 LCD framebuffer support
2: make uImage
make modules
cp arch/arm/boot/uImage /work/nfs_root/uImage_nolcd
3.使用新的uImage启动开发板：
insmod cfbcopyarea.ko
insmod cfbfillrect.ko
insmod cfbimgblt.ko
insmod lcd.ko
4.
ech0 hello > /dev/tty1 //可以看到LCD上有hello
cat lcd.ko > /dev/fb0 //有花屏
5.修改/etc/inittab
tty1::askfirst:-/bin/sh
insmod cfbcopyarea.ko
insmod cfbfillrect.ko
insmod cfbimgblt.ko
insmod lcd.ko
insmod buttons.ko
通过按键控制另一个sh控制台
1 #include <linux/module.h>
2 #include <linux/kernel.h>
3 #include <linux/errno.h>
4 #include <linux/string.h>
5 #include <linux/mm.h>
6 #include <linux/slab.h>
7 #include <linux/delay.h>
8 #include <linux/fb.h>
9 #include <linux/init.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/interrupt.h>
12 #include <linux/workqueue.h>
13 #include <linux/wait.h>
14 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16
17 #include <asm/io.h>
18 #include <asm/uaccess.h>
19 #include <asm/div64.h>
20
21 #include <asm/mach/map.h>
22 #include <asm/arch/regs-lcd.h>
23 #include <asm/arch/regs-gpio.h>
24 #include <asm/arch/fb.h>
25
26 struct lcd_regs{
27 unsigned long lcdcon1;
28 unsigned long lcdcon2;
29 unsigned long lcdcon3;
30 unsigned long lcdcon4;
31 unsigned long lcdcon5;
32 unsigned long lcdsaddr1;
33 unsigned long lcdsaddr2;
34 unsigned long lcdsaddr3;
35 unsigned long redlut;
36 unsigned long greenlut;
37 unsigned long bluelut;
38 unsigned long reserved[9];
39 unsigned long dithmode;
40 unsigned long tpal;
41 unsigned long lcdintpnd;
42 unsigned long lcdsrcpnd;
43 unsigned long lcdintmsk;
44 unsigned long lpcsel;
45
46 };
47
48 static struct fb_info *s3c_lcd;
49 /* gpbon,gpbdat,c,d,g, */
50 volatile unsigned long *gpbcon;
51 volatile unsigned long *gpbdat;
52 volatile unsigned long *gpccon;
53 volatile unsigned long *gpdcon;
54 volatile unsigned long *gpgcon;
55 static volatile struct lcd_regs* lcd_regs;
56 static u32 pseudo_palette[16];
57
58 static inline unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
59 {
60 chan &= 0xffff;
61 chan >>= 16 - bf->length;
62 return chan << bf->offset;
63 }
64
65 static int s3c_lcdfb_setcolreg(unsigned int regno, unsigned int red,
66 unsigned int green, unsigned int blue,
67 unsigned int transp, struct fb_info *info)
68 {
69 unsigned int val;
70
71 if (regno > 16)
72 return 1;
73
74 /* 用red,green,blue三原色构造出val */
75 val = chan_to_field(red, &info->var.red);
76 val |= chan_to_field(green, &info->var.green);
77 val |= chan_to_field(blue, &info->var.blue);
78
79 //((u32 *)(info->pseudo_palette))[regno] = val;
80 pseudo_palette[regno] = val;
81 return 0;
82 }
83
84 static struct fb_ops s3c_lcdfb_ops = {
85 .owner = THIS_MODULE,
86 .fb_setcolreg = s3c_lcdfb_setcolreg,
87 .fb_fillrect = cfb_fillrect,
88 .fb_copyarea = cfb_copyarea,
89 .fb_imageblit = cfb_imageblit,
90 };
91
92
93 static int lcd_init(void)
94 {
95
96 /* 1. 分配一个fb_info */
97 s3c_lcd = framebuffer_alloc(0, NULL);
98
99 /* 2. 设置 */
100 /* 2.1 设置固定的参数 */
101 strcpy(s3c_lcd->fix.id, "mylcd");
102 s3c_lcd->fix.smem_len = 480 * 272 * 16 / 8;
103 s3c_lcd->fix.type = FB_TYPE_PACKED_PIXELS;
104 s3c_lcd->fix.visual = FB_VISUAL_TRUECOLOR; /*TFT*/
105 s3c_lcd->fix.line_length = 480 * 2;
106
107 /* 2.2 设置可变的参数 */
108 s3c_lcd->var.xres = 480;
109 s3c_lcd->var.yres = 272;
110 s3c_lcd->var.xres_virtual = 480;
111 s3c_lcd->var.yres_virtual = 272;
112 s3c_lcd->var.bits_per_pixel = 16;
113
114 /* RGB:565 */
115 s3c_lcd->var.red.offset = 11;
116 s3c_lcd->var.red.length = 5;
117
118 s3c_lcd->var.green.offset = 5;
119 s3c_lcd->var.green.length = 6;
120
121 s3c_lcd->var.blue.offset = 0;
122 s3c_lcd->var.blue.length = 5;
123
124 s3c_lcd->var.activate = FB_ACTIVATE_NOW;
125
126 /* 2.3 设置操作函数 */
127 s3c_lcd->fbops = &s3c_lcdfb_ops;
128
129 /* 2.4 其他设置 */
130 s3c_lcd->pseudo_palette = pseudo_palette; //假的调色板
131
132 s3c_lcd->screen_size = 480 * 272 * 16 / 8;
133
134 /* 3. 硬件相关的设置 */
135 /* 3.1 配置GPIO用于LCD */
136 //0x56000010 ,8
137 gpbcon = ioremap(0x56000010, 8);
138 gpbdat = gpbcon + 1;
139 gpccon = ioremap(0x56000020, 4);
140 gpdcon = ioremap(0x56000030, 4);
141 gpgcon = ioremap(0x56000060, 4);
142 //映射是一页一页映射，不用担心不足
143 *gpccon = 0xaaaaaaaa; // GPIO管脚用于VD[7:0],LCDVF[2:0],VM,VFRAME,VLINE,VCLK,LEND
144 *gpdcon = 0xaaaaaaaa; // GPIO管脚用于VD[23:8]
145 *gpbcon &= ~(3); // Power enable pin
146 *gpbcon |= (0x01);
147 *gpbdat &= ~(1<<0); // Power off
148 *gpgcon |= (3<<8); // GPG4用作LCD_PWREN
149
150 /* 3.2 根据LCD手册设置LCD控制器，比如VCLK的频率等 */
151 lcd_regs = ioremap(0x4D000000, sizeof(struct lcd_regs));
152
153 /*
154 * 设置LCD控制器的控制寄存器LCDCON1~5
155 * 1. LCDCON1:
156 * 设置VCLK的频率：VCLK(Hz) = HCLK/[(CLKVAL+1)x2]
157 * 选择LCD类型: TFT LCD
158 * 设置显示模式: 16BPP
159 * 先禁止LCD信号输出
160 * 2. LCDCON2/3/4:
161 * 设置控制信号的时间参数
162 * 设置分辨率，即行数及列数
163 * 现在，可以根据公式计算出显示器的频率：
164 * 当HCLK=100MHz时，
165 * Frame Rate = 1/[{(VSPW+1)+(VBPD+1)+(LIINEVAL+1)+(VFPD+1)}x
166 * {(HSPW+1)+(HBPD+1)+(HFPD+1)+(HOZVAL+1)}x
167 * {2x(CLKVAL+1)/(HCLK)}]
168 * = 60Hz
169 * 3. LCDCON5:
170 * 设置显示模式为16BPP时的数据格式: 5:6:5
171 * 设置HSYNC、VSYNC脉冲的极性(这需要参考具体LCD的接口信号): 反转
172 * 半字(2字节)交换使能
173 */
174
175 lcd_regs->lcdcon1 = (4<<8) | (0x3<<5) | 176 (0xC<<1) | (0<<0);
177 lcd_regs->lcdcon2 = (1<<24) | (271<<14) | 178 (1<<6) | (10-1);
179 lcd_regs->lcdcon3 = (1<<19) | (479<<8) | (1);
180 lcd_regs->lcdcon4 = 40;
181 lcd_regs->lcdcon5 = (1<<11) | (1<<9) | (1<<8) | 182 (1<<1);
183 /* 3.3 分配显存(framebuffer)，并把地址告诉LCD控制器 */
184 s3c_lcd->screen_base = dma_alloc_writecombine(NULL, 185 s3c_lcd->fix.smem_len, &s3c_lcd->fix.smem_start, GFP_KERNEL);
186 lcd_regs->lcdsaddr1 = (s3c_lcd->fix.smem_start>>1) & ~(3 << 30);
187 lcd_regs->lcdsaddr2 = ((s3c_lcd->fix.smem_start + s3c_lcd->fix.smem_len) >> 1) 188 & ( 0X1fffff );
189 lcd_regs->lcdsaddr3 = (0<<11) | (480 *16/16);
190
191 /* 启动LCD */
192 lcd_regs->lcdcon1 |= (1 << 0); //使能LCD本身
193 lcd_regs->lcdcon5 |= (1<<3); // 设置是否输出LCD_PWREN
194 *gpbdat |= (1<<0); // Power on
195
196 /* 4. 注册 */
197
198 register_framebuffer(s3c_lcd);
199
200 return 0;
201 }
202
203 static int lcd_exit(void)
204 {
205 unregister_framebuffer(s3c_lcd);
206 lcd_regs->lcdcon1 &= ~(1 << 0); //关闭LCD本身
207 *gpbdat &= ~(1<<0); // Power off
208 dma_free_writecombine(NULL, s3c_lcd->fix.smem_len, 209 s3c_lcd->screen_base, s3c_lcd->fix.smem_start);
210
211 iounmap(gpbcon);
212 iounmap(gpccon);
213 iounmap(gpdcon);
214 iounmap(gpgcon);
215
216 framebuffer_release(&s3c_lcd);
217 return 0;
218 }
219
220 module_init(lcd_init);
221 module_exit(lcd_exit);
222
223 MODULE_LICENSE("GPL");
时间： 2024-10-10 12:34:32