Linux2.6.24下的USB HOST移植

最新推荐文章于 2024-12-09 13:54:42 发布

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最新推荐文章于 2024-12-09 13:54:42 发布 · 1.3k 阅读

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CC 4.0 BY-SA版权

文章标签：

#linux #descriptor #performance #include #filesystems #c

本文档详细介绍了如何在Linux2.6.24内核中移植USB HOST功能到S3C2410平台，包括代码修改、内核配置、解决设备识别错误(-62)和挂载问题，以及针对不同错误的调试方法。

未作移植，插入U盘后提示如下

[root@Emux/]#usb 1-1: new full speed USB device using s3c2410-ohci and address 2
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: new full speed USB device using s3c2410-ohci and address 3
usb 1-1: device descriptor read/64, error -62
usb 1-1: device descriptor read/64, error -62
usb 1-1: new full speed USB device using s3c2410-ohci and address 4
usb 1-1: device not accepting address 4, error -62
usb 1-1: new full speed USB device using s3c2410-ohci and address 5
usb 1-1: device not accepting address 5, error -62
hub 1-0:1.0: unable to enumerate USB device on port 1

2.代码修改——修改arch/arm/mach-s3c2410/mach-smdk2410.c
＋＃include <asm/arch/regs-clock.h>
＋＃include <asm/arch/usb-control.h>
＋＃include <linux/device.h>
＋＃include <linux/delay.h>

＋static struct s3c2410_hcd_info usb_sbc2410_info = {
＋ .port[0] = {

＋ .flags = S3C_HCDFLG_USED
＋ }
＋};

＋int usb_sbc2410_init(void)
＋{
＋unsigned long upllvalue = (0x78<<12)|(0x02<<4)|(0x03);
＋printk("USB Control, (c) 2006 sbc2410/n");
＋s3c_device_usb.dev.platform_data = &usb_sbc2410_info;
＋while(upllvalue!=__raw_readl(S3C2410_UPLLCON))
＋{
＋__raw_writel(upllvalue,S3C2410_UPLLCON);
＋mdelay(1);
＋}
＋return 0;
＋}

static void __init smdk2410_map_io(void)
{
s3c24xx_init_io(smdk2410_iodesc, ARRAY_SIZE(smdk2410_iodesc));
s3c24xx_init_clocks(0);
s3c24xx_init_uarts(smdk2410_uartcfgs, ARRAY_SIZE(smdk2410_uartcfgs));
s3c24xx_set_board(&smdk2410_board);
＋usb_sbc2410_init();
}

3.内核配置
>让内核支持热插拔