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2012-10-28 09:51:34
对于网卡驱动的移植，最好还是懂得一些网卡和网络的知识为好。想要速成的话，我极力推荐您看看zcx3000的专栏。他的关于RTL8019的文章总结得很好，使我受益匪浅。感谢zcx3000！！！
URL：http://blog.csdn.net/zcx3000/category/237774.aspx
六、博创2410－S所配网卡AX88796（NE2000兼容网卡）驱动的移植。
（1）修改arch/arm/目录下的Kconfig文件，增加ISA总线支持，使其在make menuconfig 时出现NE2000的网卡配置选项。
config ARCH_S3C2410
bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
select GENERIC_GPIO
select ISA
help
Samsung S3C2410X CPU based systems, such as the Simtec Electronics
BAST (<), the IPAQ 1940 or
the Samsung SMDK2410 development board (and derivatives).
（2）修改include/asm-arm/arch-s3c2410文件夹下的map.h文件。加入AX88796的地址映射。
/***************tekkaman****************************/
#define S3C2410_VA_ISA_NET S3C2410_ADDR(0x02100000)
#define S3C2410_PA_ISA_NET __phys_to_pfn(0x10000000)
#define S3C2410_SZ_ISA_NET SZ_1M
/**********************tekkaman********************/
说明：
a、根据网上的资料，“#define S3C2410_VA_ISA_NET S3C2410_ADDR(0x02100000)”的地址可以自己修改，只要不和别的虚拟地址冲突就行。我有试过将起改成“#define S3C2410_VA_ISA_NET (0xd1000000)”，也就是博创的2.4.18的定义，也可以正常启动。
b、“#define S3C2410_PA_ISA_NET __phys_to_pfn(0x10000000)”这句困扰了我很久。一开始我的定义是“#define S3C2410_PA_ISA_NET (0x10000000)”，所以启动后系统就死在了网卡的初始化上，出现“Unable to handle kernel paging request at virtual address ”的错误。后来我上网查找资料，才知道：原来实地址与虚地址的映射结构 smdk2410_iodesc 里有所变化。第二个参数从原来的 unsigned long physical 变为 unsigned long pfn （Page Frame Number 页帧号）。而从 smdk2410_iodesc 传入的S3C2410_PA_ISA_NET 仍然是一个 physical 值，因此出现以上的错误。只要在物理地址前加上“__phys_to_pfn”就可以解决这个问题。较详细的讲解请看我的参考资料
（【置顶】移植Linux2.6.22.2到博创2410-S(s3c2410A)（1）前面有链接地址）。
（3）修改arch/arm/mach-s3c2410文件夹下的mach-smdk2410.c文件。在smdk2410_iodesc 中加入AX88796的地址信息。
static struct map_desc smdk2410_iodesc[] __initdata = {
/* nothing here yet */
{
.virtual = S3C2410_VA_ISA_NET,
.pfn = S3C2410_PA_ISA_NET,
.length = S3C2410_SZ_ISA_NET,
.type = MT_DEVICE,
}
};
以下修改为选做，可以不改：
随便在这里取消LCD的初始化，不然启动时会有出错信息（因为我现在的项目用不到，以后有空我会添上LCD的移植和GUI的移植）：
static struct platform_device *smdk2410_devices[] __initdata = {
&s3c_device_usb,
// &s3c_device_lcd,
&s3c_device_wdt,
&s3c_device_i2c,
&s3c_device_iis,
};
修改开发板的名称（可以自定义）：
MACHINE_START(SMDK2410, "Tekkaman2410")
（4）修改网卡驱动的主要文件drivers/net/ne.c。
a、添加头文件和定义
#include
#include
//**********************tekkaman*************************
#include
#include
#include
#include
#include
#include
#define AX88796_BASE (vAX88796_BASE+0x200)
#define AX88796_IRQ IRQ_EINT2
#define pAX88796_BASE S3C2410_PA_ISA_NET
#define vAX88796_BASE S3C2410_VA_ISA_NET
#define EXTINT_OFF (IRQ_EINT4 - 4)
//**********************tekkaman*****************************
......
在static struct { const char *name8, *name16; unsigned char SAprefix[4];}
bad_clone_list[] __initdata 中增加AX88796 的MAC地址前三位（不一定需要）:
{"AX88796", "NE2000-compatible", {0x08, 0x08, 0x08}},
b、确保定义总线宽度为16位。
将
#if defined(CONFIG_PLAT_MAPPI)
# define DCR_VAL 0x4b
#elif defined(CONFIG_PLAT_OAKS32R) || \
defined(CONFIG_TOSHIBA_RBTX4927) || defined(CONFIG_TOSHIBA_RBTX4938)
# define DCR_VAL 0x48 /* 8-bit mode */
#else
# define DCR_VAL 0x49
#endif
修改为
#if 0
#if defined(CONFIG_PLAT_MAPPI)
# define DCR_VAL 0x4b
#elif defined(CONFIG_PLAT_OAKS32R) || \
defined(CONFIG_TOSHIBA_RBTX4927) || defined(CONFIG_TOSHIBA_RBTX4938)
# define DCR_VAL 0x48 /* 8-bit mode */
#else
#endif
#endif
# define DCR_VAL 0x49
c、在do_ne_probe函数中增加配置总线参数、基地址和中断的语句（其参数参考 刘淼 的书）
static int __init do_ne_probe(struct net_device *dev)
{
unsigned long base_addr = dev->base_addr;
#ifdef NEEDS_PORTLIST
int orig_irq = dev->irq;
#endif
//******************************tekkaman********************************
static int once=0;
if (once) {
return -ENXIO;
}
unsigned int value;
value = __raw_readl(S3C2410_BWSCON);
value &= ~(S3C2410_BWSCON_WS2|S3C2410_BWSCON_ST2|S3C2410_BWSCON_DW2_32);
value |= (S3C2410_BWSCON_ST2|S3C2410_BWSCON_DW2_16);
__raw_writel(value, S3C2410_BWSCON);
value=0;
value = (S3C2410_BANKCON_Tacs4|S3C2410_BANKCON_Tcos4|S3C2410_BANKCON_Tacc14|S3C2410_BANKCON_Tcoh4|S3C2410_BANKCON_Tcah4|S3C2410_BANKCON_Tacp6|S3C2410_BANKCON_PMCnorm);
__raw_writel(value,S3C2410_BANKCON2);
set_irq_type(AX88796_IRQ,IRQ_TYPE_LEVEL_LOW );
s3c2410_gpio_cfgpin(S3C2410_GPF2, S3C2410_GPF2_EINT2);
s3c2410_gpio_pullup(S3C2410_GPF2, 0);
if(base_addr==0){
dev->base_addr = base_addr = AX88796_BASE ;
dev->irq = AX88796_IRQ;
once++;
}
//***********************************tekkaman************************************
SET_MODULE_OWNER(dev);
/* First check any supplied i/o locations. User knows best.
if (base_addr > 0x1ff) /* Check a single specified location. */
return ne_probe1(dev, base_addr);
else if (base_addr != 0) /* Don't probe at all. */
return -ENXIO;
......
d、修改ne_probe1函数
增加自定义的网卡MAC地址（这个地址可以自行修改，但是MAC也有一定的规则，最重要的是千万不要把它配置为广播或组播地址，请参考网络的相关书籍）：
static int __init ne_probe1(struct net_device *dev, unsigned long ioaddr)
{
int i;
unsigned char ne_defethaddr[]={0x08,0x08,0x08,0x08,0x12,0x27,0};//tekkaman
unsigned char SA_prom[32];
int wordlength = 2;
......
增加网卡MAC地址的配置语句，屏蔽通过EEPROM配置网卡的语句
......
struct {unsigned char value, offset; } program_seq[] =
{
{E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD}, /* Select page 0*/
{0x48, EN0_DCFG}, /* Set byte-wide (0x48) access. */
{0x00, EN0_RCNTLO}, /* Clear the count regs. */
{0x00, EN0_RCNTHI},
{0x00, EN0_IMR}, /* Mask completion irq. */
{0xFF, EN0_ISR},
{E8390_RXOFF, EN0_RXCR}, /* 0x20 Set to monitor */
{E8390_TXOFF, EN0_TXCR}, /* 0x02 and loopback mode. */
{32, EN0_RCNTLO},
{0x00, EN0_RCNTHI},
{0x00, EN0_RSARLO}, /* DMA starting at 0x0000. */
{0x00, EN0_RSARHI},
{E8390_RREAD+E8390_START, E8390_CMD},
};
for (i = 0; i < sizeof(program_seq)/sizeof(program_seq[0]); i++)
outb_p(program_seq[i].value, ioaddr + program_seq[i].offset);
}
//****************************************tekkaman*********************************
{
unsigned char *ep;
ep = (unsigned char * ) &ne_defethaddr[0];
ne_defethaddr[5]++;
for(i=0;i<6;i++) {
SA_prom[i] = ep[i];
}
SA_prom[14] = SA_prom[15]=0x57;
wordlength =2;
}
//****************************************tekkaman*********************************
#if 0 //tekkaman
for(i = 0; i < 32 /*sizeof(SA_prom)*/; i+=2) {
SA_prom[i] = inb(ioaddr + NE_DATAPORT);
SA_prom[i+1] = inb(ioaddr + NE_DATAPORT);
if (SA_prom[i] != SA_prom[i+1])
wordlength = 1;
}
#endif //tekkaman
if (wordlength == 2)
{
#if 0 //tekkaman
for (i = 0; i < 16; i++)
SA_prom[i] = SA_prom[i+i];
/* We must set the 8390 for word mode. */
outb_p(DCR_VAL, ioaddr + EN0_DCFG);
start_page = NESM_START_PG;
/*
* Realtek RTL8019AS datasheet says that the PSTOP register
* shouldn't exceed 0x60 in 8-bit mode.
* This chip can be identified by reading the signature from
* the remote byte count registers (otherwise write-only)...
*/
if ((DCR_VAL & 0x01) == 0 && /* 8-bit mode */
inb(ioaddr + EN0_RCNTLO) == 0x50 &&
inb(ioaddr + EN0_RCNTHI) == 0x70)
stop_page = 0x60;
else
stop_page = NESM_STOP_PG;
#endif //tekkaman
outb_p(0x49, ioaddr + EN0_DCFG);
start_page = NESM_START_PG;
stop_page = NESM_STOP_PG;
} else {
start_page = NE1SM_START_PG;
stop_page = NE1SM_STOP_PG;
}
......
屏蔽自定检测中断号的语句(参考 刘淼 的书)：
......
#if 0 //tekkaman
if (dev->irq < 2)
{
unsigned long cookie = probe_irq_on();
outb_p(0x50, ioaddr + EN0_IMR); /* Enable one interrupt. */
outb_p(0x00, ioaddr + EN0_RCNTLO);
outb_p(0x00, ioaddr + EN0_RCNTHI);
outb_p(E8390_RREAD+E8390_START, ioaddr); /* Trigger it... */
mdelay(10); /* wait 10ms for interrupt to propagate */
outb_p(0x00, ioaddr + EN0_IMR); /* Mask it again. */
dev->irq = probe_irq_off(cookie);
if (ei_debug > 2)
printk(" autoirq is %d\n", dev->irq);
} else if (dev->irq == 2)
/* Fixup for users that don't know that IRQ 2 is really IRQ 9,
or don't know which one to set. */
dev->irq = 9;
#endif //tekkaman
if (! dev->irq) {
printk(" failed to detect IRQ line.\n");
ret = -EAGAIN;
goto err_out;
}
AX88697的移植到此结束！
