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(lái)想試著修改內(nèi)核中關(guān)于hub.c和ohci-s3c2410中的代碼，看看能不能好使，但后來(lái)在PC機(jī)上的hub下使用攝像頭也不好使，看來(lái)是我使用的zc301攝像頭對(duì)hub不支持吧。（估計(jì)一般的攝像頭都對(duì)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(guò)關(guān)于s3c2410的手冊(cè)，它應(yīng)該是支持2個(gè)usb host通道的啊，2440應(yīng)該也是如此。所以仔細(xì)看了下s3c2440的手冊(cè)，發(fā)現(xiàn)第二個(gè)usb hos通道的管腳和usb device的管腳是復(fù)用的。所以感覺將usb device改成host應(yīng)該是可行的，深入研究研究。（好像一些板子已經(jīng)設(shè)計(jì)出來(lái)可以跳線選擇，友善之臂的沒這么設(shè)計(jì)）

要將usb device改成host，不只是硬件上需要改動(dòng)，軟件驅(qū)動(dòng)上肯定也需要改動(dòng)，所以分為硬件和軟件兩個(gè)部分。

硬件上：仔細(xì)看了mini2440的手冊(cè)中的關(guān)于usb電路圖，其實(shí)硬件電路上host和device沒什么本質(zhì)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(yīng)該也不會(huì)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(gè)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(dòng)了。自己動(dòng)手做了一個(gè)usb host口。

軟件上：本質(zhì)就是對(duì)寄存器MISCCR的設(shè)置改變一下，為了以后改動(dòng)方便，我參考了網(wǎng)上的一些《關(guān)于陽(yáng)初2440 超值版只能使用一個(gè) USB Host 問(wèn)題的解決》的方法。以下主要參照了一些關(guān)于這個(gè)方法的帖子博客之類的。（轉(zhuǎn)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(shè)置的緣故，我在mach-2410.c中增加了設(shè)置MISCCR寄存器的內(nèi)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(shè)置UPLLCON

upllvalue = (0x78<<12)|(0x02<<4)|(0x03);

__raw_writel(upllvalue,S3C2410_UPLLCON);

//設(shè)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(shè)置2410觸摸屏

set_s3c2410ts_info(&sbc2410_ts_cfg);

//設(shè)置USB相關(guān)寄存器

usb_seigpao_init();

/* end by seigpao */

}

不知道為什么會(huì)有第二篇，感覺不適合，所以又重網(wǎng)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(dòng)。頭文件位置可能根據(jù)內(nèi)核不同做相應(yīng)改動(dòng)。我的2.6.29內(nèi)核中的regs-clock.h和regs-gpio.h是在archarmmach-s3c2410includemach中。我拷貝兩個(gè)頭文件到本地drivers/usb/host/，include 變成""。

然后make zImage,之后Kconfig會(huì)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(xiàng)選的時(shí)候選成2就行了，因?yàn)閏onfig MAX_ROOT_PORTS為2代表使用兩個(gè)host。

燒寫生成的內(nèi)核，結(jié)果大失所望，啟動(dòng)后在自己焊出的usb host口上插上設(shè)備沒反應(yīng)。不過(guò)郁悶重啟之時(shí)，發(fā)現(xiàn)先在這之上插上設(shè)備啟動(dòng)時(shí)，設(shè)備就能識(shí)別出來(lái)了。而且插入無(wú)線網(wǎng)卡可以配置使用。不過(guò)使用攝像頭確出現(xiàn)錯(cuò)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(duì)內(nèi)核的改動(dòng)上，當(dāng)改動(dòng)內(nèi)核時(shí)就感覺帖子文章中第二篇沒什么用，跟第一篇有些重復(fù)之嫌，后來(lái)替代的在static void s3c2410_start_hc中的改動(dòng)也是，感覺有些重復(fù)static int usb_hcd_s3c2410_probe中的內(nèi)容，所以重新編譯內(nèi)核，將對(duì)static void s3c2410_start_hc的改動(dòng)去掉，即不改s3c2410_start_hc，重新編譯內(nèi)核燒寫，結(jié)果使用攝像頭正常。

也就是說(shuō)，usb device已經(jīng)改成了usb host，可以當(dāng)成usb host使用了，只不過(guò)，必需先插入設(shè)備再啟動(dòng)板子，分析這種情況的原因可能是因?yàn)閎ootloader中肯定有對(duì)usb部分的設(shè)置驅(qū)動(dòng)之類的，（Nor Flash的時(shí)候可以使用usb device進(jìn)行下載傳輸，說(shuō)明肯定已經(jīng)驅(qū)上了usb device），vivi的設(shè)置跟重新編譯的內(nèi)核對(duì)usb設(shè)置不一樣，可能就導(dǎo)致了這種情況，我也不確定是不是這個(gè)原因。不插設(shè)備的時(shí)候啟動(dòng)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(shè)備比如無(wú)線網(wǎng)卡，就能找到設(shè)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(duì)于這種情況，上網(wǎng)搜了一下，好像修改vivi中的upll設(shè)置，在main中添加了ChangeUPllValue(56,2,2)一句后，問(wèn)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(shí)現(xiàn)的，基于2410與2440沒有本質(zhì)差別，2410上應(yīng)該也可以。