s3c6410_LCD & frame buffer 驱动分析(三)

帧缓冲设备的参数设置和gpio配置#include <linux/wait.h>#include <linux/fb.h>#include <linux/delay.h>#include <linux/platform_device.h>#include <mach/regs-gpio.h>#include <mach/regs-lcd.h>#include "s3cfb.h"#define S3CFB_HFP 2 /* front porch */#define S3CFB_HSW 41 /* hsync width */#define S3CFB_HBP 2 /* back porch */#define S3CFB_VFP 2 /* front porch */#define S3CFB_VSW 10 /* vsync width */#define S3CFB_VBP 2 /* back porch */#define S3CFB_HRES 480 /* horizon pixel x resolition */#define S3CFB_VRES 272 /* line cnt y resolution */#define S3CFB_HRES_VIRTUAL 480 /* horizon pixel x resolition */ #define S3CFB_VRES_VIRTUAL 544 /* line cnt y resolution */ #define S3CFB_HRES_OSD 480 /* horizon pixel x resolition */ #define S3CFB_VRES_OSD 272 /* line cnt y resolution */ #define S3CFB_VFRAME_FREQ 60 /* frame rate freq */#define S3CFB_PIXEL_CLOCK (S3CFB_VFRAME_FREQ * (S3CFB_HFP +S3CFB_HSW + S3CFB_HBP + S3CFB_HRES) * (S3CFB_VFP + S3CFB_VSW + S3CFB_VBP + S3CFB_VRES))//设置LCD各信号之间的时间参数需要参考LCD技术手册static void s3cfb_set_fimd_info(void){//设置HSYNC和SYNC高电平有效,VDEN低电平有效(极性)s3cfb_fimd.vidcon1 = S3C_VIDCON1_IHSYNC_INVERT |S3C_VIDCON1_IVSYNC_INVERT | S3C_VIDCON1_IVDEN_NORMAL;//设置各信号之间的时间参数需要参考LCD数据手册s3cfb_fimd.vidtcon0 = S3C_VIDTCON0_VBPD(S3CFB_VBP - 1) |S3C_VIDTCON0_VFPD(S3CFB_VFP - 1) | S3C_VIDTCON0_VSPW(S3CFB_VSW - 1); s3cfb_fimd.vidtcon1 = S3C_VIDTCON1_HBPD(S3CFB_HBP - 1) |S3C_VIDTCON1_HFPD(S3CFB_HFP - 1) | S3C_VIDTCON1_HSPW(S3CFB_HSW - 1); s3cfb_fimd.vidtcon2 = S3C_VIDTCON2_LINEVAL(S3CFB_VRES - 1) |S3C_VIDTCON2_HOZVAL(S3CFB_HRES - 1);//配置窗口位置寄存器A 和 B//win0左上角的X、Y坐标(0,0)s3cfb_fimd.vidosd0a = S3C_VIDOSDxA_OSD_LTX_F(0) |S3C_VIDOSDxA_OSD_LTY_F(0);//win0右下角角的X、Y坐标(479,271)s3cfb_fimd.vidosd0b = S3C_VIDOSDxB_OSD_RBX_F(S3CFB_HRES - 1) |S3C_VIDOSDxB_OSD_RBY_F(S3CFB_VRES - 1);//win1左上角的X、Y坐标(0,0)s3cfb_fimd.vidosd1a = S3C_VIDOSDxA_OSD_LTX_F(0) |S3C_VIDOSDxA_OSD_LTY_F(0);//win1右下角角的X、Y坐标(479,271)s3cfb_fimd.vidosd1b = S3C_VIDOSDxB_OSD_RBX_F(S3CFB_HRES_OSD - 1) | S3C_VIDOSDxB_OSD_RBY_F(S3CFB_VRES_OSD - 1);//设置LCD真实分辨率s3cfb_fimd.width = S3CFB_HRES;//图像宽度480s3cfb_fimd.height = S3CFB_VRES;//图像高度272s3cfb_fimd.xres = S3CFB_HRES;//水平可见解析度480s3cfb_fimd.yres = S3CFB_VRES;//垂直可见解析度272//如果设置了虚拟屏#if defined(CONFIG_FB_S3C_EXT_VIRTUAL_SCREEN)s3cfb_fimd.xres_virtual = S3CFB_HRES_VIRTUAL;//480s3cfb_fimd.yres_virtual = S3CFB_VRES_VIRTUAL;//544#elses3cfb_fimd.xres_virtual = S3CFB_HRES;//640s3cfb_fimd.yres_virtual = S3CFB_VRES;//480#endif//填充s3cfb_fimd_info_t结构中的成员s3cfb_fimd.osd_width = S3CFB_HRES_OSD;s3cfb_fimd.osd_height = S3CFB_VRES_OSD;s3cfb_fimd.osd_xres = S3CFB_HRES_OSD;s3cfb_fimd.osd_yres = S3CFB_VRES_OSD;s3cfb_fimd.osd_xres_virtual = S3CFB_HRES_OSD;s3cfb_fimd.osd_yres_virtual = S3CFB_VRES_OSD;s3cfb_fimd.pixclock = S3CFB_PIXEL_CLOCK;s3cfb_fimd.hsync_len = S3CFB_HSW;s3cfb_fimd.vsync_len = S3CFB_VSW;s3cfb_fimd.left_margin = S3CFB_HFP;s3cfb_fimd.upper_margin = S3CFB_VFP;s3cfb_fimd.right_margin = S3CFB_HBP;s3cfb_fimd.lower_margin = S3CFB_VBP;}//初始化4.3寸LCDvoid s3cfb_init_hw_43(void){printk(KERN_INFO "LCD TYPE :: LTE480WV will be initialized\n");s3cfb_set_fimd_info();s3cfb_set_gpio();}//对于QT6410使用的LCD是4.3寸屏,根据原理图可知 LCD接在s3c6410的GPI 和GPJ上,背光信号接在GPF14上。

int s3cfb_set_gpio(void){unsigned long val;int i, err;//使能LCD时钟/* enable clock to LCD */val = readl(S3C_HCLK_GATE);//LCD使用HCLKval |= S3C_CLKCON_HCLK_LCD;writel(val, S3C_HCLK_GATE);/*设置LCD为普通的RGB接口 */val = readl(S3C64XX_SPCON);val &= ~0x3;val |= (1 << 0);writel(val, S3C64XX_SPCON);//设置GPI(i)为LCD接口for (i = 0; i < 16; i++)s3c_gpio_cfgpin(S3C64XX_GPI(i), S3C_GPIO_SFN(2));//设置GPJ(i)为LCD接口for (i = 0; i < 12; i++)s3c_gpio_cfgpin(S3C64XX_GPJ(i), S3C_GPIO_SFN(2));/* backlight ON *///GPF14用作背光信号//printk("oPEN LCD BACKLIGHT1.\n");if (gpio_is_valid(S3C64XX_GPF(14))) { //NOTE: orign GPF15 hereerr = gpio_request(S3C64XX_GPF(14), "GPF");if (err) {printk(KERN_ERR "failed to request GPF for ""lcd backlight control\n");return err;}gpio_direction_output(S3C64XX_GPF(14), 1);//配置成输出引脚gpio_set_value(S3C64XX_GPF(14), 1);//设置成高电平}//QT6410接S3C64XX_GPE(0)电源使能引脚printk("oPEN LCD Power on.\n");if (gpio_is_valid(S3C64XX_GPE(0))) {err = gpio_request(S3C64XX_GPE(0), "GPE");if (err) {printk(KERN_ERR "failed to request GPE for ""lcd reset control\n");return err;}gpio_direction_output(S3C64XX_GPE(0), 1); }gpio_set_value(S3C64XX_GPE(0), 1);gpio_free(S3C64XX_GPE(0));#ifndef CONFIG_BACKLIGHT_PWMgpio_free(S3C64XX_GPF(14));#endifreturn 0;}。