2440/2410上將usb device改成usb host
usb 1-1: reset full speed USB device using s3c2410-ohci and address 3
usb 1-1.2: new full speed USB device using s3c2410-ohci and address 4
usb 1-1.2: device descriptor read/64, error -62
usb 1-1.2: device descriptor read/64, error -62
usb 1-1.2: new full speed USB device using s3c2410-ohci and address 5
usb 1-1.2: device descriptor read/64, error -62
usb 1-1.2: device descriptor read/64, error -62
usb 1-1.2: new full speed USB device using s3c2410-ohci and address 6
usb 1-1.2: device not accepting address 6, error -62
usb 1-1.2: new full speed USB device using s3c2410-ohci and address 7
usb 1-1.2: device not accepting address 7, error -62
hub 1-1:1.0: unable to enumerate USB device on port 2
本來想試著修改內核中關于hub.c和ohci-s3c2410中的代碼,看看能不能好使,但后來在PC機上的hub下使用攝像頭也不好使,看來是我使用的zc301攝像頭對hub不支持吧。(估計一般的攝像頭都對hub不支持,我又試了另一款也是這樣的)。
所以放棄了在usb hub上使用攝像頭的想法。記得以前看過關于s3c2410的手冊,它應該是支持2個usb host通道的啊,2440應該也是如此。所以仔細看了下s3c2440的手冊,發(fā)現第二個usb hos通道的管腳和usb device的管腳是復用的。所以感覺將usb device改成host應該是可行的,深入研究研究。(好像一些板子已經設計出來可以跳線選擇,友善之臂的沒這么設計)
要將usb device改成host,不只是硬件上需要改動,軟件驅動上肯定也需要改動,所以分為硬件和軟件兩個部分。
硬件上:仔細看了mini2440的手冊中的關于usb電路圖,其實硬件電路上host和device沒什么本質區(qū)別,一些外拉電阻不一樣,VBUS的提供者不一樣。將device改成host感覺外拉電阻不一樣應該也不會影響使用,所以就沒有改變,避免在板子上做手腳。其它的就是要給VBUS一個5v的電源,而不是像device一樣電腦供電了。其它的就沒什么改動了。自己動手做了一個usb host口。
軟件上:本質就是對寄存器MISCCR的設置改變一下,為了以后改動方便,我參考了網上的一些《關于陽初2440 超值版只能使用一個 USB Host 問題的解決》的方法。以下主要參照了一些關于這個方法的帖子博客之類的。(轉載一些)
第一篇:
修改linux-2.6.20.3/drivers/usb/host/Kconfig,添加:
config MAX_ROOT_PORTS
int "Maximum port(s) of RootHub"
depends on USB_OHCI_HCD && ARCH_S3C2410
default 1
---help---
pls select usb host number,default one host and one device.so We select one normally
修改/linux-2.6.20.3/drivers/usb/host/ohci-s3c2410.c
static int usb_hcd_s3c2410_probe (const struct hc_driver *driver,
struct platform_device *dev)
{
struct usb_hcd *hcd = NULL;
int retval;
//add by hiboy
unsigned long tmp;
#if CONFIG_MAX_ROOT_PORTS < 2
/* 1 host port, 1 slave port*/
tmp = __raw_readl(S3C2410_MISCCR);
tmp &= ~S3C2410_MISCCR_USBHOST;
__raw_writel(tmp, S3C2410_MISCCR);
s3c2410_usb_set_power(dev->dev.platform_data, 1, 1);
#else
/* 2 host port */
tmp = __raw_readl(S3C2410_MISCCR);
tmp |= S3C2410_MISCCR_USBHOST;
__raw_writel(tmp, S3C2410_MISCCR);
s3c2410_usb_set_power(dev->dev.platform_data, 1, 1);
s3c2410_usb_set_power(dev->dev.platform_data, 2, 1);
#endif
//s3c2410_usb_set_power(dev->dev.platform_data, 1, 1);
//s3c2410_usb_set_power(dev->dev.platform_data, 2, 1);
......
修改/linux-2.6.20.3/drivers/usb/core/hub.c
static int hub_configure(struct usb_hub *hub,
struct usb_endpoint_descriptor *endpoint)
{
struct usb_device *hdev = hub->hdev;
struct device *hub_dev = hub->intfdev;
u16 hubstatus, hubchange;
u16 wHubCharacteristics;
unsigned int pipe;
int maxp, ret;
char *message;
hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
&hub->buffer_dma);
if (!hub->buffer) {
message = "cant allocate hub irq buffer";
ret = -ENOMEM;
goto fail;
}
hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
if (!hub->status) {
message = "cant kmalloc hub status buffer";
ret = -ENOMEM;
goto fail;
}
mutex_init(&hub->status_mutex);
hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
if (!hub->descriptor) {
message = "cant kmalloc hub descriptor";
ret = -ENOMEM;
goto fail;
}
/* Request the entire hub descriptor.
* hub->descriptor can handle USB_MAXCHILDREN ports,
* but the hub can/will return fewer bytes here.
*/
ret = get_hub_descriptor(hdev, hub->descriptor,
sizeof(*hub->descriptor));
if (ret < 0) {
message = "cant read hub descriptor";
goto fail;
} else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
message = "hub has too many ports!";
ret = -ENODEV;
goto fail;
}
/********************************************/
/*add by hiboy */
#ifdef CONFIG_ARCH_S3C2410
if ((hdev->devnum == 1) // Root Hub
&& hub->descriptor->bNbrPorts > CONFIG_MAX_ROOT_PORTS) {
int j;
for (j=hub->descriptor->bNbrPorts-1; j>=0; j--) {
printk("port #%d ", j);
if (j > CONFIG_MAX_ROOT_PORTS-1) {
printk("suspened!n");
} else {
printk("alived!n");
}
}
hub->descriptor->bNbrPorts = CONFIG_MAX_ROOT_PORTS;
}
#endif
/*********************************************/
第二篇:
是由于MISCCR寄存器沒有正確設置的緣故,我在mach-2410.c中增加了設置MISCCR寄存器的內容,HOST0就可以正常使用了
/*add by seigpao*/
int usb_seigpao_init(void)
{
unsigned long upllvalue;
unsigned long misccr;
//設置UPLLCON
upllvalue = (0x78<<12)|(0x02<<4)|(0x03);
__raw_writel(upllvalue,S3C2410_UPLLCON);
//設置MISCCR
misccr = __raw_readl(S3C2410_MISCCR);
misccr |= S3C2410_MISCCR_USBHOST;
misccr &= ~(S3C2410_MISCCR_USBSUSPND0 | S3C2410_MISCCR_USBSUSPND1);
__raw_writel(misccr,S3C2410_MISCCR);
return 1;
}
/* end by seigpao */
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);
/*add by seigpao*/
//設置2410觸摸屏
set_s3c2410ts_info(&sbc2410_ts_cfg);
//設置USB相關寄存器
usb_seigpao_init();
/* end by seigpao */
}
不知道為什么會有第二篇,感覺不適合,所以又重網上找了另一篇文章。
修改ohci-s3c2440.c文件(含頭文件):
#include
#include
#include
/*add here*/
#include
#include
#include
#include
/*end here*/
#define valid_port(idx) ((idx) == 1 || (idx) == 2)
/*add here*/
static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
{
unsigned long upllvalue = (0x78<<12)|(0x02<<4)|(0x03); //add upllvalue
unsigned long misccr; //add misccr
struct s3c2410_hcd_info *info = dev->dev.platform_data;
while (upllvalue != __raw_readl(S3C2410_UPLLCON)) //setup UPLLCON
{
__raw_writel(upllvalue, S3C2410_UPLLCON);
mdelay(1);
}
misccr = __raw_readl(S3C2410_MISCCR); //MISCCR
misccr |= S3C2410_MISCCR_USBHOST;
misccr&=~(S3C2410_MISCCR_USBSUSPND0|S3C2410_MISCCR_USBSUSPND1);
__raw_writel(misccr,S3C2410_MISCCR);
dev_dbg(&dev->dev, "s3c2410_start_hc:n");
clk_enable(clk);
if (info != NULL) {
info->hcd = hcd;
info->report_oc = s3c2410_hcd_oc;
if (info->enable_oc != NULL) {
(info->enable_oc)(info, 1);
}
}
}
使用了這篇文章的改動。頭文件位置可能根據內核不同做相應改動。我的2.6.29內核中的regs-clock.h和regs-gpio.h是在archarmmach-s3c2410includemach中。我拷貝兩個頭文件到本地drivers/usb/host/,include 變成""。
然后make zImage,之后Kconfig會重新選擇,
USB support (USB_SUPPORT) [Y/n/?] y
Support for Host-side USB (USB) [Y/n/m/?] y
USB verbose debug messages (USB_DEBUG) [N/y/?] n
USB announce new devices (USB_ANNOUNCE_NEW_DEVICES) [Y/n/?] y
*
* Miscellaneous USB options
*
USB device filesystem (USB_DEVICEFS) [Y/n/?] y
USB device class-devices (DEPRECATED) (USB_DEVICE_CLASS) [N/y/?] n
Dynamic USB minor allocation (USB_DYNAMIC_MINORS) [N/y/?] n
USB Monitor (USB_MON) [N/m/y/?] n
Enable Wireless USB extensions (EXPERIMENTAL) (USB_WUSB) [N/m/y/?] n
Support WUSB Cable Based Association (CBA) (USB_WUSB_CBAF) [N/m/y/?] n
*
* USB Host Controller Drivers
*
Cypress C67x00 HCD support (USB_C67X00_HCD) [N/m/y/?] n
OXU210HP HCD support (USB_OXU210HP_HCD) [N/m/y/?] n
ISP116X HCD support (USB_ISP116X_HCD) [N/m/y/?] n
OHCI HCD support (USB_OHCI_HCD) [Y/n/m/?] y
SL811HS HCD support (USB_SL811_HCD) [N/m/y/?] n
R8A66597 HCD support (USB_R8A66597_HCD) [N/m/y/?] n
Host Wire Adapter (HWA) driver (EXPERIMENTAL) (USB_HWA_HCD) [N/m/y/?] n
Maximum port(s) of RootHub (MAX_ROOT_PORTS) [2] (NEW)
最后一項選的時候選成2就行了,因為config MAX_ROOT_PORTS為2代表使用兩個host。
燒寫生成的內核,結果大失所望,啟動后在自己焊出的usb host口上插上設備沒反應。不過郁悶重啟之時,發(fā)現先在這之上插上設備啟動時,設備就能識別出來了。而且插入無線網卡可以配置使用。不過使用攝像頭確出現錯誤:
gspca: ISOC data error: [1] len=318, status=-84
gspca: ISOC data error: [4] len=274, status=-84
gspca: ISOC data error: [25] len=144, status=-84
gspca: ISOC data error: [1] len=240, status=-84
等等。這是又回到對內核的改動上,當改動內核時就感覺帖子文章中第二篇沒什么用,跟第一篇有些重復之嫌,后來替代的在static void s3c2410_start_hc中的改動也是,感覺有些重復static int usb_hcd_s3c2410_probe中的內容,所以重新編譯內核,將對static void s3c2410_start_hc的改動去掉,即不改s3c2410_start_hc,重新編譯內核燒寫,結果使用攝像頭正常。
也就是說,usb device已經改成了usb host,可以當成usb host使用了,只不過,必需先插入設備再啟動板子,分析這種情況的原因可能是因為bootloader中肯定有對usb部分的設置驅動之類的,(Nor Flash的時候可以使用usb device進行下載傳輸,說明肯定已經驅上了usb device),vivi的設置跟重新編譯的內核對usb設置不一樣,可能就導致了這種情況,我也不確定是不是這個原因。不插設備的時候啟動信息改的usb 1-2提示:
usb 1-2: new full speed USB device using s3c2410-ohci and address 3
usb 1-2: device descriptor read/64, error -62
usb 1-2: device descriptor read/64, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 4
usb 1-2: device descriptor read/64, error -62
usb 1-2: device descriptor read/64, error -62
usb 1-2: new full speed US. device using s3c2410-ohci and address 5
usb 1-2: device not accepting addre髎 5, error -62
usb 1-2: new full speed USB device using s3c2410-ohci and address 6
usb 1-2: device not accepting address 6, error -62
hub 1-0:1.0: unable to enumerate USB device on port 2
但是,插上設備比如無線網卡,就能找到設備,提示:
usb 1-2: new full speed USB device using s3c2410-o鑓i and address 3
usb 1-2: New USB device found, idVen鋙r=0ace, idProduct=1215
usb 1-2: New USB device strings: Mfr=16, Product=32, SerialNumber=0
usb 1-2: Product: USB2.0 WLAN
usb 1-2: Manufacturer: ZyDAS
usb 1-2: configuration #1 chosen from 1 choice
usb 1-2: reset full speed USB device using s3c2410-ohci and address 3
wmaster0 (zd1211rw): not using net_device_ops yet
wlan0 (zd1211rw): not using net_device_ops yet
zd1211rw 1-2:1.0: phy0
對于這種情況,上網搜了一下,好像修改vivi中的upll設置,在main中添加了ChangeUPllValue(56,2,2)一句后,問題可以解決。具體沒有再試,先如此的用著吧。
我是在友善之臂的mini2440上實現的,基于2410與2440沒有本質差別,2410上應該也可以。
評論