linux2.6.22下usb驱动完成情况及问题解决

2007.11.16
1.在kernel启动是出现如下问题：
mount: mounting tmpfs on /dev failed
解决方案如下，
File systems --->
Pseudo filesystems --->
[*] Virtual memory file system support (former shm fs)

2.另附上vivi启动参数，最近一直用nfs，转换着麻烦，先记下来cp
设置从flash 启动：
param set linux_cmd_line "noinitrd init=/linuxrc console=ttySAC0 root=/dev/mtdblock3"
设置从nfs启动：
param set linux_cmd_line "noinitrd init=/linuxrc console=ttySAC0 root=/dev/nfs nfsroot=192.192.192.xx:/srv/nfs/rootfs ip=192.192.192.200:192.192.192.xx:192.192.192.xx:255.255.255.0::eth0:off"
设置从ramdisk启动：
param set linux_cmd_line "console=ttySAC0 initrd=0x30800000,0x400000 root=/dev/ram"。

3.测试通过了usb device的测试，可以进行从设备操作，对usb device进行模块加载操作，方法如下：（两个.ko文件为usb驱动的模块文件，需要加载后使用）
$ insmod s3c2410_udc.ko
$ insmod g_file_storage.ko file=/dev/mtdblock5 stall=0 removable=1

4、usb从部分添加内容：
4.1.usb初始化为从设备时配置：
+++ linux-2.6.22/arch/arm/mach-s3c2410/mach-f2410.c 2007-11-15
&s3c_device_i2c,
&s3c_device_iis,
&s3c_device_nand,
+/* add by feng */
+ &s3c_device_usbgadget,
};
/* USB */
s3c_device_usb.dev.platform_data = &usb_s3c2410_info;
s3c2410_modify_misccr(S3C2410_MISCCR_USBSUSPND0 |
- S3C2410_MISCCR_USBSUSPND1, 0x8);
+ S3C2410_MISCCR_USBSUSPND1 |
+ S3C2410_MISCCR_USBHOST, 0x0);

4.2.添加udc驱动：
+++ linux-2.6.22/drivers/usb/gadget/s3c2410-udc.c 2007-11-15 17:38:17.000000000 +0800
+++ linux-2.6.22/drivers/usb/gadget/s3c2410-udc.h 2007-11-15 17:38:31.000000000 +0800
+++ linux-2.6.22/include/asm/arch-s3c2410/regs-udc.h 2007-11-16 01:22:25.000000000 +0800

4.3.在kconfig中添加udc选项支持：
+++ linux-2.6.22/drivers/usb/gadget/Kconfig 2007-11-15
Select this only if your OMAP board has a Mini-AB connector.
+# add by feng
+config USB_GADGET_S3C2410
+ boolean "S3C2410"
+ depends on ARCH_S3C2410
+ help
+ Samsung's S3C2410 is an ARM-4 processor with an integrated
+ full speed USB 1.1 device controller.
+ It has 4 configurable endpoints, as well as endpoint
+ zero (for control transfers).
+
+config USB_S3C2410
+ tristate
+ depends on USB_GADGET_S3C2410
+ default USB_GADGET
+ select USB_GADGET_SELECTED
+
+config USB_S3C2410_DEBUG
+ boolean "S3C2410 udc debug messages"
+ depends on USB_GADGET_S3C2410
+#end add
+
config USB_GADGET_AT91
boolean "AT91 USB Device Port"
4.4.在makefile中添加udc选项支持：
+++ linux-2.6.22/drivers/usb/gadget/Makefile 2007-11-15 17:01:04.000000000 +0800
obj-$(CONFIG_USB_FSL_USB2) += fsl_usb2_udc.o
+#add by feng
+obj-$(CONFIG_USB_S3C2410) += s3c2410-udc.o

2007.11.15
一、学习ctags查找源码的用法，超级方便
步骤：
1，现在源码目录中运行指令
$ ctags -R * ($ 为Linux系统Shell提示符)
2，用vi进入编辑环境，
Ctrl + ]查找查询
Ctrl + T返回上一步
:ta XX 查找文件XX
二、usb从部分(以后添加)
1，添加udc驱动：

在kconfig中添加udc支持：

在makefile中添加udc支持：

2.配置
Device Drivers --->
USB Gadget Support --->
Support for USB Gadgets
USB Peripheral Controller (S3C2410) --->
(X) S3C2410
File-backed Storage Gadget
2007.11.14
参考luofuchong的帖子，修改文件，并修改mach-f2410.c文件，使其支持usb的初始化
在mach-f2410.c添加如下：

#include
#include
#include
#include
#include

/* USB */
static struct s3c2410_hcd_info usb_s3c2410_info = {
.port[0] = {
.flags = S3C_HCDFLG_USED
},
.port[1] = {
.flags = S3C_HCDFLG_USED
}
};

int __init s3c2410_init_usb(void)
{
unsigned long upllvalue;
printk("USB Control, (c) 2006 pc104\n");
s3c_device_usb.dev.platform_data = &usb_s3c2410_info;

s3c2410_modify_misccr(S3C2410_MISCCR_USBSUSPND0 |
S3C2410_MISCCR_USBSUSPND1, 0x8);

upllvalue = (0x78<<12)|(0x02<<4)|(0x03);
while(upllvalue!=__raw_readl(S3C2410_UPLLCON))
{
__raw_writel(upllvalue,S3C2410_UPLLCON);
mdelay(1);
}
return 0;
}

static void __init f2410_init_machine(void)
{
s3c_device_nand.dev.platform_data = &sbc2410x_nand_info;
platform_add_devices(f2410_devices, ARRAY_SIZE(f2410_devices));
s3c2410_init_usb();
}

下面为配置：

下面为拷贝luofuchong的 linux-2.6.14下USB驱动移植心得，主要根据2.6.22的核改了一下，使其可以支持u盘。
/*****************************************from luofuchong**********************************/
１、让内核支持热插拔
│ General setup --->
[*] Configure standard kernel features (for small systems) --->
[*] Support for hot-pluggable devices (NEW)
2.USB驱动设置
Device Drivers --->
Generic Driver Options --->
<*> Userspace firmware loading support
Block devices --->
<*> Low Performance USB Block driver
SCSI device support --->
<*> SCSI generic support
[*] Probe all LUNs on each SCSI device
USB support --->
<*> Support for Host-side USB
[*] USB device filesystem
<*> OHCI HCD support
<*> USB Mass Storage support
[*] USB Monitor
３、加入了MSDOS fs和VFAT fs的支持。

File systems --->
DOS/FAT/NT Filesystems --->
<*> MSDOS fs support
<*> VFAT (Windows-95) fs support
(936) Default codepage for FAT
(cp936) Default iocharset for FAT

File systems --->
Partition Types --->
[*] PC BIOS (MSDOS partition tables) support

4. 加入中文字体库（可惜在我的板上还是没能正常显示中文~_~，知道的朋友麻烦告诉我一声，大家一起探讨）
Native Language Support --->
<*> Simplified Chinese charset (CP936, GB2312)
<*> NLS UTF8

5、另外，如果想让内核把它当成SCSI设备来处理的话，只要把上面：
Device Drivers --->
Block devices --->
<*> Low Performance USB Block driver
的 Low Performance USB Block driver这个选项去掉，然后把：
Device Drivers --->
SCSI device support --->
<*>SCSI disk support
的SCSI disk support这个选项选上，重新编译内核就行。
/***************************************end from*********************************************/
2007.11.13