2440/2410上將usb device改成usb host
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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(jué)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(méi)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(méi)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(jué)外拉電阻不一樣應(yīng)該也不會(huì)影響使用，所以就沒(méi)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(méi)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(lèi)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(méi)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(jué)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(xiě)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(méi)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(jué)帖子文章中第二篇沒(méi)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(jué)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(xiě)，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(lèi)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(méi)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(méi)有本質(zhì)差別，2410上應(yīng)該也可以。
評(píng)論