LCD及FrameBuffer驱动(四)————FrameBuffer驱动实现实例
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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 <asm/arch/regs-lcd.h>//#include <asm/arch/regs-gpio.h>//#include <asm/arch/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 *gpbcon;static volatile unsigned long *gpbdat;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];/* from pxafb.c */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; /* 用red,green,blue三原色构造出val */ val = chan_to_field(red, &info->var.red); val |= chan_to_field(green, &info->var.green); val |= chan_to_field(blue, &info->var.blue); //((u32 *)(info->pseudo_palette))[regno] = val; pseudo_palette[regno] = val; return 0;}static int lcd_init(void){ /* 1. 分配一个fb_info */ s3c_lcd = framebuffer_alloc(0, NULL); /* 2. 设置 */ /* 2.1 设置固定的参数 */ strcpy(s3c_lcd->fix.id, "mylcd"); s3c_lcd->fix.smem_len = 320*240*16/8; /* TQ2440的LCD位宽是24,但是2440里会分配4字节即32位(浪费1字节) */ s3c_lcd->fix.type = FB_TYPE_PACKED_PIXELS; s3c_lcd->fix.visual = FB_VISUAL_TRUECOLOR; /* TFT */ s3c_lcd->fix.line_length = 320*2; /* 2.2 设置可变的参数 */ s3c_lcd->var.xres = 320; s3c_lcd->var.yres = 240; s3c_lcd->var.xres_virtual = 320; s3c_lcd->var.yres_virtual = 240; s3c_lcd->var.xoffset =0; s3c_lcd->var.yoffset =0; s3c_lcd->var.bits_per_pixel = 16; /* RGB:565 */ 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; /* 2.3 设置操作函数 */ s3c_lcd->fbops = &s3c_lcdfb_ops; /* 2.4 其他的设置 */ s3c_lcd->pseudo_palette = pseudo_palette; //s3c_lcd->screen_base = ; /* 显存的虚拟地址 */ s3c_lcd->screen_size =320*240*16/8; /* 3. 硬件相关的操作 */ /* 3.1 配置GPIO用于LCD */ gpbcon = ioremap(0x56000010, 8); gpbdat = gpbcon+1; gpccon = ioremap(0x56000020, 4); gpdcon = ioremap(0x56000030, 4); gpgcon = ioremap(0x56000060, 4); *gpccon = 0xaaaaaaaa; /* GPIO管脚用于VD[7:0],LCDVF[2:0],VM,VFRAME,VLINE,VCLK,LEND */ *gpdcon = 0xaaaaaaaa; /* GPIO管脚用于VD[23:8] */// *gpbcon &= ~(3); /* GPB0设置为输出引脚 */// *gpbcon |= 1;// *gpbdat &= ~1; /* 输出低电平 */ *gpgcon |= (3<<8); /* GPG4用作LCD_PWREN */ /* 3.2 根据LCD手册设置LCD控制器, 比如VCLK的频率等 */ lcd_regs = ioremap(0x4D000000, sizeof(struct lcd_regs)); /* * TQ2440 4.3英寸LCD手册为WXCAT43-TG6#001_V1.0.pdf第22、23页 * * LCD手册和2440手册"Figure 15-6. TFT LCD Timing Example"一对比就知道参数含义了 */ /* bit[17:8]: VCLK = HCLK / [(CLKVAL+1) x 2], LCD手册P22 (Dclk=9MHz~15MHz) * 10MHz(100ns) = 100MHz / [(CLKVAL+1) x 2] * CLKVAL = 4 * bit[6:5]: 0b11, TFT LCD * bit[4:1]: 0b1101, 24 bpp for TFT * bit[0] : 0 = Disable the video output and the LCD control signal. */ lcd_regs->lcdcon1 = (7<<8) | (3<<5) | (0x0c<<1); /* 垂直方向的时间参数 * bit[31:24]: VBPD, VSYNC之后再过多长时间才能发出第1行数据 * LCD手册 tvb=2 * VBPD=1 * bit[23:14]: 多少行, 272, 所以LINEVAL=272-1=271 * bit[13:6] : VFPD, 发出最后一行数据之后,再过多长时间才发出VSYNC * LCD手册tvf=2, 所以VFPD=2-1=1 * bit[5:0] : VSPW, VSYNC信号的脉冲宽度, LCD手册tvp=10, 所以VSPW=10-1=9 */ lcd_regs->lcdcon2 = (4<<24) | (239<<14) | (4<<6) | (4<<0); /* 水平方向的时间参数 * bit[25:19]: HBPD, VSYNC之后再过多长时间才能发出第1行数据 * LCD手册 thb=2 * HBPD=1 * bit[18:8]: 多少列, 480, 所以HOZVAL=480-1=479 * bit[7:0] : HFPD, 发出最后一行里最后一个象素数据之后,再过多长时间才发出HSYNC * LCD手册thf=2, 所以HFPD=2-1=1 */ //lcd_regs->lcdcon3 = (13<<19) | (319<<8) | (4<<0); //lcd_regs->lcdcon3 = (1<<19) | (319<<8) | (0<<0); lcd_regs->lcdcon3 = (0<<19) | (319<<8) | (4<<0); /* 水平方向的同步信号 * bit[7:0] : HSPW, HSYNC信号的脉冲宽度, LCD手册Thp=41, 所以HSPW=41-1=40 */ lcd_regs->lcdcon4 = (13<<8)|(18); /* 信号的极性 * bit[11]: 1=565 format, 对于24bpp这个不用设 * bit[10]: 0 = The video data is fetched at VCLK falling edge * bit[9] : 1 = HSYNC信号要反转,即低电平有效 * bit[8] : 1 = VSYNC信号要反转,即低电平有效 * bit[6] : 0 = VDEN不用反转 * bit[3] : 0 = PWREN输出0 * * BSWP = 0, HWSWP = 0, BPP24BL = 0 : 当bpp=24时,2440会给每一个象素分配32位即4字节,哪一个字节是不使用的? 看2440手册P412 * bit[12]: 0, LSB valid, 即最高字节不使用 * bit[1] : 0 = BSWP * bit[0] : 0 = HWSWP */ lcd_regs->lcdcon5 = (1<<11)|(0<<10) | (1<<9) | (1<<8) | (0<<12) | (0<<1) | (1<<0); /* 3.3 分配显存(framebuffer), 并把地址告诉LCD控制器 */ 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 =(320*16/16); /* 一行的长度(单位: 2字节) */ //s3c_lcd->fix.smem_start = xxx; /* 显存的物理地址 */ /* 启动LCD */ lcd_regs->lcdcon1 |= (1<<0); /* 使能LCD控制器 */ lcd_regs->lcdcon5 |= (1<<3); /* 使能LCD本身: LCD_PWREN */// *gpbdat |= 1; /* 输出高电平, 使能背光, TQ2440的背光电路也是通过LCD_PWREN来控制的 */ /* 4. 注册 */ register_framebuffer(s3c_lcd); return 0;}static void lcd_exit(void){ unregister_framebuffer(s3c_lcd); lcd_regs->lcdcon1 &= ~(1<<0); /* 关闭LCD控制器 */ lcd_regs->lcdcon1 &= ~(1<<3); /* 关闭LCD本身 */// *gpbdat &= ~1; /* 关闭背光 */ dma_free_writecombine(NULL, s3c_lcd->fix.smem_len, s3c_lcd->screen_base, s3c_lcd->fix.smem_start); iounmap(lcd_regs); iounmap(gpbcon); iounmap(gpccon); iounmap(gpdcon); iounmap(gpgcon); framebuffer_release(s3c_lcd);}module_init(lcd_init);module_exit(lcd_exit);MODULE_LICENSE("GPL");
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