移植ok6410 LCD驱动

1.本次移植过程选择 linux-2.6.28 lcd驱动为参考移植到 linux-2.6.34 ok6410 开发板上。

2.移植过程

主要以给内核增加驱动的思想，在/driver/video/ 下增加 samsung目录，提取 2.6.28 中驱动相关源代码，将源代码复制到samsung 下。

修改 /driver/video 下的Makefile 文件，增加进入samsung目录编译的编译条目

obj-$(CONFIG_FB_S3C)              += samsung/

修改 /driver/video 下的Kconfig 文件，增加 /samsung/Kconfig 配置条目

comment "Frame buffer hardware drivers"
    depends on FB
config FB_S3C
    tristate "S3C Framebuffer Support"
    select FB_CFB_FILLRECT
    select FB_CFB_COPYAREA
    select FB_CFB_IMAGEBLIT
    depends on FB && (ARCH_S3C64XX || ARCH_S5P64XX || ARCH_S5PC1XX)

    default n
    ---help---
    TBA

choice
depends on FB_S3C
prompt "Select LCD Type"
default FB_LIYUTAI_WXCAT35

config FB_WXCAT35
    bool "WXCAT35 320x240"
    ---help---
    TBA
config FB_WXCAT43
    bool "WXCAT43 480x272"
    ---help---
    TBA

config FB_AT056
    bool "AT056   640x480"
    ---help---
    TBA
config FB_AT070
    bool "AT070   800x480"
    ---help---
    TBA


config FB_AT080
    bool "AT080   800x600"
    ---help---
    TBA

config FB_S3C_VGA800
    bool "VGA800  800x600"
    ---help---
    TBA
config FB_S3C_XGA
    bool "XGA  1024x768"
    ---help---
    TBA

endchoice

config FB_S3C_BPP
    tristate "Advanced options for S3C Framebuffer"
    depends on FB_S3C
    default n
    ---help---
    TBA

choice
depends on FB_S3C_BPP
prompt "Select BPP(Bits Per Pixel)"
default FB_S3C_BPP_16
config FB_S3C_BPP_8
    bool "8 BPP"
    ---help---
    TBA

config FB_S3C_BPP_16
    bool "16 BPP"
    ---help---
    TBA

config FB_S3C_BPP_24
    bool "24 BPP(XRGB888)"
    ---help---
    TBA


config FB_S3C_BPP_28
    bool "28 BPP(ARGB4888)"
    ---help---
    TBA

config FB_S3C_BPP_32
    bool "32 BPP(ARGB8888)"
    ---help---
    TBA
endchoice

config FB_S3C_NUM
    int "Number of Framebuffers"
    depends on FB_S3C_BPP && (ARCH_S3C64XX || ARCH_S5P64XX || ARCH_S5PC1XX)
    default "1"
    ---help---
    TBA

config FB_S3C_VIRTUAL_SCREEN
    bool "Enable Virtual Screen"
    depends on FB_S3C_BPP

    default n
    ---help---
    TBA

config FB_S3C_DOUBLE_BUFFERING
    bool "Enable Double Buffering"
    depends on FB_S3C_BPP

    default n
    ---help---
    TBA

 3. 增加 platform_device

找到移植系统时增加的板文件 mach-ok6410.c ,增加 lcd device

/* LCD Controller */

static struct resource s3c_lcd_resource[] = {
    [0] = {
        .start = S3C64XX_PA_LCD,
        .end   = S3C64XX_PA_LCD + SZ_1M - 1,
        .flags = IORESOURCE_MEM,
    },
    [1] = {
        .start = IRQ_LCD_VSYNC,
        .end   = IRQ_LCD_SYSTEM,
        .flags = IORESOURCE_IRQ,
    }
};

static u64 s3c_device_lcd_dmamask = 0xffffffffUL;

struct platform_device s3c_device_lcd = {
    .name          = "s3c-lcd",
    .id          = -1,
    .num_resources      = ARRAY_SIZE(s3c_lcd_resource),
    .resource      = s3c_lcd_resource,
    .dev              = {
        .dma_mask        = &s3c_device_lcd_dmamask,
        .coherent_dma_mask    = 0xffffffffUL
    }
};

再修改 struct platform_device *ok6410_devices[]，增加

&s3c_device_lcd,

 4.启动时出现小企鹅