Porting OK6410 LCD driver

1. In this transplantation process, the linux-2.6.28 lcd driver is selected as a reference and transplanted to the linux-2.6.34 ok6410 development board.

2. Transplantation process

The main idea is to add drivers to the kernel. Add a samsung directory under /driver/video/, extract the driver-related source code in 2.6.28, and copy the source code to samsung.

Modify the Makefile file under /driver/video and add the compilation entry for entering the samsung directory

obj-$(CONFIG_FB_S3C)              += samsung/

Modify the Kconfig file under /driver/video and add the /samsung/Kconfig configuration entry

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. Add platform_device

Find the board file mach-ok6410.c added when porting the system, and add 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

}

};

Then modify struct platform_device *ok6410_devices[] and add

&s3c_device_lcd,

4. Little penguin appears at startup