目标平台:mini2440
内核:linux2.6.32.2
1,修改arch/arm/mach-s3c2440/mach-mini2440.c文件,加入头文件:
#include <linux/spi/spi.h>然后加入如下代码:
#include <../mach-s3c2410/include/mach/spi.h>
static struct spi_board_info s3c2410_spi0_board[] =注意:这在2.6.29中可行,但是在2.6.32源代码中没有定义S3C2410_GPG2宏定义,要使用S3C2410_GPG(2)宏定义。移植过程中,尤其要注意,不同内核版本对结构体,函数等表示方法的变化
{
[0] = {
.modalias = "spidev",
.bus_num = 0,
.chip_select = 0,
.irq = IRQ_EINT9,
.max_speed_hz = 500 * 1000,
}
};
static struct s3c2410_spi_info s3c2410_spi0_platdata = {
.pin_cs = S3C2410_GPG(2),
.num_cs = 1,
.bus_num = 0,
.gpio_setup = s3c24xx_spi_gpiocfg_bus0_gpe11_12_13,
};
static struct spi_board_info s3c2410_spi1_board[] =
{
[0] = {
.modalias = "spidev",
.bus_num = 1,
.chip_select = 0,
.irq = IRQ_EINT2,
.max_speed_hz = 500 * 1000,
}
};
static struct s3c2410_spi_info s3c2410_spi1_platdata = {
.pin_cs = S3C2410_GPG(3),
.num_cs = 1,
.bus_num = 1,
.gpio_setup = s3c24xx_spi_gpiocfg_bus1_gpg5_6_7,
};
在mini2440_devices[]平台数组中添加如下代码:
static struct platform_device *mini2440_devices[] __initdata = {最后在mini2440_machine_init函数中加入如下代码:
&s3c_device_usb,
&s3c_device_lcd,
&s3c_device_wdt,
&s3c_device_i2c0,
&s3c_device_iis,
&s3c_device_rtc,
&s3c_device_nand,//NAND
&mini2440_device_eth,//DM9000
&s3c_device_spi0,//spi
&s3c_device_spi1,//spi
};
static void __init mini2440_machine_init(void)
{
s3c24xx_fb_set_platdata(&mini2440_fb_info);
s3c_i2c0_set_platdata(NULL);
platform_add_devices(mini2440_devices, ARRAY_SIZE(mini2440_devices));
//smdk_machine_init();
//SPI
s3c_device_spi0.dev.platform_data= &s3c2410_spi0_platdata;
spi_register_board_info(s3c2410_spi0_board, ARRAY_SIZE(s3c2410_spi0_board));
s3c_device_spi1.dev.platform_data= &s3c2410_spi1_platdata;
spi_register_board_info(s3c2410_spi1_board, ARRAY_SIZE(s3c2410_spi1_board));
}
最后需要修改arch/arm/plat-s3c24xx/KConfig文件
找到如下代码段:
config S3C24XX_SPI_BUS0_GPE11_GPE12_GPE13修改为
bool
help
SPI GPIO configuration code for BUS0 when connected to
GPE11, GPE12 and GPE13.
config S3C24XX_SPI_BUS1_GPG5_GPG6_GPG7
bool
help
SPI GPIO configuration code for BUS 1 when connected to
GPG5, GPG6 and GPG7.
config S3C24XX_SPI_BUS0_GPE11_GPE12_GPE13最后我们配置编译文件:
bool "S3C24XX_SPI_BUS0_GPE11_GPE12_GPE13"
help
SPI GPIO configuration code for BUS0 when connected to
GPE11, GPE12 and GPE13.
config S3C24XX_SPI_BUS1_GPG5_GPG6_GPG7
bool "S3C24XX_SPI_BUS1_GPG5_GPG6_GPG7"
help
SPI GPIO configuration code for BUS 1 when connected to
GPG5, GPG6 and GPG7.
make menuconfig图1
图2
图3
图5
编译内核
make zImage将编译好的内核导入开发板,并且编译Linux Source自带的测试程序,在Documentation/spi下,修改spidev_test.c文件,将device name改为/dev/spidev1.0
将编译好的文件下载到开发板上,并且将开发板的SPI MOI和MIO短接,也就是让SPI自己发送自己接收,执行文件