linux LCD驱动
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- #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 <mach/regs-lcd.h>
- #include <mach/regs-gpio.h>
- #include <mach/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 *gpccon;
- static volatile unsigned long *gpdcon;
- static volatile unsigned long *gpgcon;
- static volatile struct lcd_regs* lcd_regs;
- static u32 pseudo_palette[16];
-
-
-
-
- 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;
-
-
- val = chan_to_field(red, &info->var.red);
- val |= chan_to_field(green, &info->var.green);
- val |= chan_to_field(blue, &info->var.blue);
-
-
- pseudo_palette[regno] = val;
- return 0;
- }
-
- static int lcd_init(void)
- {
-
- s3c_lcd = framebuffer_alloc(0, NULL);
-
-
-
- strcpy(s3c_lcd->fix.id, "tq2440_480_272_lcd");
- s3c_lcd->fix.smem_len = 480*272*16/8;
- s3c_lcd->fix.type = FB_TYPE_PACKED_PIXELS;
- s3c_lcd->fix.visual = FB_VISUAL_TRUECOLOR;
- s3c_lcd->fix.line_length = 480*2;
-
-
- s3c_lcd->var.xres = 480;
- s3c_lcd->var.yres = 272;
- s3c_lcd->var.xres_virtual = 480;
- s3c_lcd->var.yres_virtual = 272;
- s3c_lcd->var.bits_per_pixel = 16;
-
-
- s3c_lcd->var.red.offset = 11;
- s3c_lcd->var.red.length = 5;
-
- s3c_lcd->var.green.offset = 5;
- s3c_lcd->var.green.length = 6;
-
- s3c_lcd->var.blue.offset = 0;
- s3c_lcd->var.blue.length = 5;
-
- s3c_lcd->var.activate = FB_ACTIVATE_NOW;
-
-
-
- s3c_lcd->fbops = &s3c_lcdfb_ops;
-
-
- s3c_lcd->pseudo_palette = pseudo_palette;
-
- s3c_lcd->screen_size = 480*272*16/8;
-
-
-
-
- gpccon = ioremap(0x56000020, 4);
- gpdcon = ioremap(0x56000030, 4);
- gpgcon = ioremap(0x56000060, 4);
-
- *gpccon = 0xaaaaaaaa;
- *gpdcon = 0xaaaaaaaa;
-
- *gpgcon |= (3<<8);
-
-
- lcd_regs = ioremap(0x4D000000, sizeof(struct lcd_regs));
-
-
-
-
-
-
-
-
- lcd_regs->lcdcon1 = (4<<8) | (3<<5) | (0x0c<<1);
-
-
-
-
-
-
-
-
-
- lcd_regs->lcdcon2 = (2<<24) | (271<<14) | (2<<6) | (10<<0);
-
-
-
-
-
-
-
-
- lcd_regs->lcdcon3 = (2<<19) | (479<<8) | (2);
-
-
-
-
- lcd_regs->lcdcon4 = (41<<0);
-
-
-
-
-
-
-
-
-
-
-
- lcd_regs->lcdcon5 = (1<<11) | (0<<10) | (1<<9) | (1<<8) | (1<<0);
-
-
- 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*16/16);
-
-
-
- lcd_regs->lcdcon1 |= (1<<0);
- lcd_regs->lcdcon5 |= (1<<3);
-
-
- register_framebuffer(s3c_lcd);
-
- return 0;
- }
-
- static void lcd_exit(void)
- {
- unregister_framebuffer(s3c_lcd);
- lcd_regs->lcdcon1 &= ~(1<<0);
- dma_free_writecombine(NULL, s3c_lcd->fix.smem_len, s3c_lcd->screen_base, s3c_lcd->fix.smem_start);
- iounmap(lcd_regs);
- iounmap(gpccon);
- iounmap(gpdcon);
- iounmap(gpgcon);
- framebuffer_release(s3c_lcd);
- }
-
- module_init(lcd_init);
- module_exit(lcd_exit);
-
- MODULE_LICENSE("GPL");
3.使用
MAKEFILE: 驱动文件名为sk_lcd.c
KERN_DIR = /home/stevenking/workspace/code/linux-2.6.39 //修改为自己的内核路径
all:
make -C $(KERN_DIR) M=`pwd` modules
clean:
make -C $(KERN_DIR) M=`pwd` modules clean
rm -rf modules.order
obj-m += sk_lcd.o
1.首先先从原先内核中make menuconfig去掉原来的驱动程序,不然会有冲突
-> Device Drivers
-> Graphics support
<M> S3C2410 LCD framebuffer support
2.编译内核,下载新的内核
make zImage
make modules
3.重建根文件系统
将linux文件夹下/driver/video/下面的
cfbfillrect.ko
cfbimgblt.ko
cfbcopyarea.ko
以及新编译的
sk_lcd.ko
放入/root/lib/文件夹下
重新 mkyaffs2image root root.bin,下载新的文件系统
4.启动之后:
cd /lib
insmod cfbcopyarea.ko
insmod cfbfillrect.ko
insmod cfbimgblt.ko
insmod sk_lcd.ko
echo hello > /dev/tty1
cat /proc/devices > /dev/tty1
就能在LCD上看到输出的文字了
补充:添加到内核
1.driver/video/kconfig
config FB_TQ2440_LCD_SK
tristate "TQ2440 LCD framebuffer support by Steven King"
depends on FB && ARCH_S3C2410
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
---help---
LCD driver by steven king 8/18/2013.
2.makefile
obj-$(CONFIG_FB_TQ2440_LCD_SK) += tq2440_lcd_sk.o
3.文件复制过去,加上选项,编译,即可。
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