Linux-2.6.32.2内核在mini2440上的移植(六)---LCD驱动移植

Linux-2.6.32.2内核在mini2440上的移植(六)---LCD驱动移植

【3】在内核中添加各种LCD 类型的支持

打开 arch/arm/mach-s3c2440/mach-mini2440.c，定位到114行到157行之间，先删除之前的LCD 设备平台代码，如下：

/* LCD driver info */

static struct s3c2410fb_display mini2440_lcd_cfg __initdata = {

.lcdcon5 = S3C2410_LCDCON5_FRM565 |

S3C2410_LCDCON5_INVVLINE |

S3C2410_LCDCON5_INVVFRAME |

S3C2410_LCDCON5_PWREN |

S3C2410_LCDCON5_HWSWP,

.type = S3C2410_LCDCON1_TFT,

.width = 240,

.height = 320,

.pixclock = 166667, /* HCLK 60 MHz, divisor 10 */

.xres = 240,

.yres = 320,

.bpp = 16,

.left_margin = 20,

.right_margin = 8,

.hsync_len = 4,

.upper_margin = 8,

.lower_margin = 7,

.vsync_len = 4,

};

static struct s3c2410fb_mach_info mini2440_fb_info __initdata = {

.displays = &mini2440_lcd_cfg,

.num_displays = 1,

.default_display = 0,

#if 0

/* currently setup by downloader */

.gpccon = 0xaa940659,

.gpccon_mask = 0xffffffff,

.gpcup = 0x0000ffff,

.gpcup_mask = 0xffffffff,

.gpdcon = 0xaa84aaa0,

.gpdcon_mask = 0xffffffff,

.gpdup = 0x0000faff,

.gpdup_mask = 0xffffffff,

#endif

.lpcsel = ((0xCE6) & ~7) | 1<<4,

};

再把友善之臂已经移植好的代码加入，如下：

//;NEC 3.5”LCD 的配置和参数设置

#if defined(CONFIG_FB_S3C2410_N240320)

#define LCD_WIDTH 240

#define LCD_HEIGHT 320

#define LCD_PIXCLOCK 100000

#define LCD_RIGHT_MARGIN 36

#define LCD_LEFT_MARGIN 19

#define LCD_HSYNC_LEN 5

#define LCD_UPPER_MARGIN 1

#define LCD_LOWER_MARGIN 5

#define LCD_VSYNC_LEN 1

//;夏普8”LCD 的配置和参数设置

#elif defined(CONFIG_FB_S3C2410_TFT640480)

#define LCD_WIDTH 640

#define LCD_HEIGHT 480

#define LCD_PIXCLOCK 80000

#define LCD_RIGHT_MARGIN 67

#define LCD_LEFT_MARGIN 40

#define LCD_HSYNC_LEN 31

#define LCD_UPPER_MARGIN 25

#define LCD_LOWER_MARGIN 5

#define LCD_VSYNC_LEN 1

//;统宝3.5”LCD 的配置和参数设置

#elif defined(CONFIG_FB_S3C2410_T240320)

#define LCD_WIDTH 240

#define LCD_HEIGHT 320

#define LCD_PIXCLOCK 146250//170000

#define LCD_RIGHT_MARGIN 25

#define LCD_LEFT_MARGIN 0

#define LCD_HSYNC_LEN 4

#define LCD_UPPER_MARGIN 1

#define LCD_LOWER_MARGIN 4

#define LCD_VSYNC_LEN 1

//;群创7”LCD 的配置和参数设置

#elif defined(CONFIG_FB_S3C2410_TFT800480)

#define LCD_WIDTH 800

#define LCD_HEIGHT 480

#define LCD_PIXCLOCK 11463//40000

#define LCD_RIGHT_MARGIN 67

#define LCD_LEFT_MARGIN 40

#define LCD_HSYNC_LEN 31

#define LCD_UPPER_MARGIN 25

#define LCD_LOWER_MARGIN 5

#define LCD_VSYNC_LEN 1

//;LCD2VGA(分辨率为1024x768)模块的配置和参数设置

#elif defined(CONFIG_FB_S3C2410_VGA1024768)

#define LCD_WIDTH 1024

#define LCD_HEIGHT 768

#define LCD_PIXCLOCK 80000

#define LCD_RIGHT_MARGIN 15

#define LCD_LEFT_MARGIN 199

#define LCD_HSYNC_LEN 15

#define LCD_UPPER_MARGIN 1

#define LCD_LOWER_MARGIN 1

#define LCD_VSYNC_LEN 1

#define LCD_CON5 (S3C2410_LCDCON5_FRM565 | S3C2410_LCDCON5_HWSWP)

#endif

#if defined (LCD_WIDTH)

static struct s3c2410fb_display mini2440_lcd_cfg __initdata = {

#if !defined (LCD_CON5)

.lcdcon5 = S3C2410_LCDCON5_FRM565 |

S3C2410_LCDCON5_INVVLINE |

S3C2410_LCDCON5_INVVFRAME |

S3C2410_LCDCON5_PWREN |

S3C2410_LCDCON5_HWSWP,

#else

.lcdcon5 = LCD_CON5,

#endif

.type = S3C2410_LCDCON1_TFT,

.width = LCD_WIDTH,

.height = LCD_HEIGHT,

.pixclock = LCD_PIXCLOCK,

.xres = LCD_WIDTH,

.yres = LCD_HEIGHT,

.bpp = 16,

.left_margin = LCD_LEFT_MARGIN + 1,

.right_margin = LCD_RIGHT_MARGIN + 1,

.hsync_len = LCD_HSYNC_LEN + 1,

.upper_margin = LCD_UPPER_MARGIN + 1,

.lower_margin = LCD_LOWER_MARGIN + 1,

.vsync_len = LCD_VSYNC_LEN + 1,

};

static struct s3c2410fb_mach_info mini2440_fb_info __initdata = {

.displays = &mini2440_lcd_cfg,

.num_displays = 1,

.default_display = 0,

.gpccon = 0xaa955699,

.gpccon_mask = 0xffc003cc,

.gpcup = 0x0000ffff,

.gpcup_mask = 0xffffffff,

.gpdcon = 0xaa95aaa1,

.gpdcon_mask = 0xffc0fff0,

.gpdup = 0x0000faff,

.gpdup_mask = 0xffffffff,

.lpcsel = 0xf82,

};

#endif

然后打开drivers/video/Kconfig，在大概1930 行加入以下配置信息：

config FB_S3C2410_DEBUG

bool "S3C2410 lcd debug messages"

depends on FB_S3C2410

help

Turn on debugging messages. Note that you can set/unset at run time

through sysfs

choice

prompt "LCD select"

depends on FB_S3C2410

help

S3C24x0 LCD size select

config FB_S3C2410_T240320

boolean "3.5 inch 240X320 Toppoly LCD"

depends on FB_S3C2410

help

3.5 inch 240X320 Toppoly LCD

config FB_S3C2410_N240320

boolean "3.5 inch 240X320 NEC LCD"

depends on FB_S3C2410

help

3.5 inch 240x320 NEC LCD

config FB_S3C2410_TFT640480

boolean "8 inch 640X480 L80 LCD"

depends on FB_S3C2410

help

8 inch 640X480 LCD

config FB_S3C2410_TFT800480

boolean "7 inch 800x480 TFT LCD"

depends on FB_S3C2410

help

7 inch 800x480 TFT LCD

config FB_S3C2410_VGA1024768

boolean "VGA 1024x768"

depends on FB_S3C2410

help

VGA 1024x768

endchoice

config FB_SM501

tristate "Silicon Motion SM501 framebuffer support"

depends on FB && MFD_SM501

select FB_CFB_FILLRECT

select FB_CFB_COPYAREA

定位到326行附近，在初始化部分加入：

static void __init mini2440_map_io(void)

{

s3c24xx_init_io(mini2440_iodesc, ARRAY_SIZE(mini2440_iodesc));

s3c24xx_init_clocks(12000000);

s3c24xx_init_uarts(mini2440_uartcfgs, ARRAY_SIZE(mini2440_uartcfgs));

}

static void __init mini2440_machine_init(void)

{

#if defined (LCD_WIDTH)

s3c24xx_fb_set_platdata(&mini2440_fb_info);

#endif

s3c_i2c0_set_platdata(NULL);

s3c_device_nand.dev.platform_data = &mini2440_nand_info;

platform_add_devices(mini2440_devices, ARRAY_SIZE(mini2440_devices));

//smdk_machine_init();

}

这样，我们就完成了LCD 驱动的移植，如果你需要加入其他型号的LCD 驱动，也可以参照上面的方式复制即可，一般小尺寸的pixclock 参数可以参考统宝3.5”的，超过640x480分辨率的参数可以参考8”LCD 的，特别要注意你使用的LCD 的长宽也要修改。

【4】配置内核并下载到开发板测试

现在，我们在命令行输入:make menuconfig 进入内核配置，依次按下面的子菜单项选择：

Device Drivers --->

Graphics support --->

<*> Support for frame buffer devices --->

LCD select (3.5 inch 240X320 Toppoly LCD) --->

(X) 3.5 inch 240X320 Toppoly LCD //选择统宝3.5寸液晶

Console display driver support --->

<*> Framebuffer Console support //支持Framebuffer控制台

[*] Select compiled-in fonts //选择字库，默认VGA 8x8 , VGA 8x16

[*] VGA 8x8 font

[*] VGA 8x16 font

[*] Bootup logo --->

[*] Standard 224-color Linux logo

按空格或者回车键选择我们需要的 LCD 型号，然后退出保存内核配置。

在命令行执行：

#make uImage

将会生成arch/arm/boot/zImage，把它烧写到开发板中，就可以看到一个小企鹅出现在屏幕上了，如图



而且logo左下方有一个光标提示符在闪动。
接下来，将要为内核添加ADC驱动