Linux-4.9.2内核在mini2440上的移植(六)——修改MD9000驱动
本篇目标：修改DM9000驱动，使内核支持网络。
6.1 移植DM9000 网卡驱动
（1）在linux-4.9.2文件夹，输入
root@ubuntu:~/linux-4.9.2#vim arch/arm/mach-s3c24xx/mach-mini2440.c
定位到53行，添加
#include
#include
（2）填充该平台设备的资源设置
定位到206行附近，如入下面代码：
tatic struct s3c2410_platform_nand mini2440_nand_info = {
.tacls = 20,
.twrph0 = 60,
.twrph1 = 20,
.nr_sets = ARRAY_SIZE(mini2440_nand_sets),
.sets = mini2440_nand_sets,
.ignore_unset_ecc = 1,
};
/* DM9000AEP 10/100 ethernet controller */
#define MACH_MINI2440_DM9K_BASE (S3C2410_CS4 + 0x300)
static struct resource mini2440_dm9k_resource[] = {
[0] = {
.start = MACH_MINI2440_DM9K_BASE,
.end = MACH_MINI2440_DM9K_BASE +3,
.flags = IORESOURCE_MEM
},
[1] = {
.start = MACH_MINI2440_DM9K_BASE + 4,
.end = MACH_MINI2440_DM9K_BASE +7,
.flags = IORESOURCE_MEM
},
[2] = {
.start = IRQ_EINT7,
.end = IRQ_EINT7,
.flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHEDGE,
}
};
/*
* * *The DM9000 has no eeprom, and it's MAC address is set by
* * *the bootloader before starting the kernel.
* * */
static struct dm9000_plat_data mini2440_dm9k_pdata = {
.flags = (DM9000_PLATF_16BITONLY |DM9000_PLATF_NO_EEPROM),
};
static struct platform_device mini2440_device_eth = {
.name = "dm9000",
.id = -1,
.num_resources = ARRAY_SIZE(mini2440_dm9k_resource),
.resource =mini2440_dm9k_resource,
.dev = {
.platform_data =&mini2440_dm9k_pdata,
},
};
static struct platform_device *mini2440_devices[]__initdata = {
&s3c_device_ohci,
&s3c_device_lcd,
&s3c_device_wdt,
&s3c_device_i2c0,
&s3c_device_iis,
&s3c_device_nand,
&mini2440_device_eth,
};
保存退出。
6.2 调整DM9000 所用的位宽寄存器
DM9000的驱动是有问题的，不能直接使用，需要修改
root@ubuntu:~/linux-4.9.2#vim drivers/net/ethernet/davicom/dm9000.c
(1)打开linux-4.9.2/drivers/net/ethernet/davicom/dm9000.c，定位到49行附近，添加2410 相关的配置定义，如下红色部分：
#include
#include
#include
#include "dm9000.h"
#define CONFIG_ARCH_S3C2410
#if defined(CONFIG_ARCH_S3C2410)
#include<../../../../arch/arm/mach-s3c24xx/regs-mem.h>
#endif
(2) 在dm9000 设备的初始化函数中添加如下红色部分，这里是配置DM9000 所用片选总线的时序，因为mini2440 目前只有一个通过总线外扩的设备，在此设备驱动中直接修改相关的寄存器配置会更加容易理解一些，当然这部分也可以放到mach-mini2440.c 中。
打开linux-4.9.2/drivers/net/ethernet/davicom/dm9000.c，定位到914行附近，加入下面代码：
/*
* Initialize dm9000 board
*/
static void
dm9000_init_dm9000(struct net_device *dev)
{
#ifdefined(CONFIG_ARCH_S3C2410)
unsigned int oldval_bwscon = *(volatile unsigned int*)S3C2410_BWSCON; unsignedint oldval_bankcon4 = *(volatile unsigned int *)S3C2410_BANKCON4; *((volatile unsigned int*)S3C2410_BWSCON) = (oldval_bwscon &~(3<<16)) | (1<<16) | (1<<18) | (1<<19); *((volatile unsigned int*)S3C2410_BANKCON4) = 0x1f7c;
#endif
struct board_info *db= netdev_priv(dev);
unsigned int imr;
unsigned int ncr;
到此为止 DM9000 就已经移植结束了。
6.3编译测试
root@ubuntu:~/linux-4.9.2# make -j8
root@ubuntu:~/linux-4.9.2#./mkuImage.sh