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480

s3cfb_fimd.height = S3CFB_VRES;//图像高度272

s3cfb_fimd.xres = S3CFB_HRES;//水平可见解析度480

s3cfb_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;//480

s3cfb_fimd.yres_virtual = S3CFB_VRES_VIRTUAL;//544

#else

s3cfb_fimd.xres_virtual = S3CFB_HRES;//640

s3cfb_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LCD

void 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HCLK

val |= 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 here

err = 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_PWM

gpio_free(S3C64XX_GPF(14));

#endif

return 0;

}