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          EEPW首頁 > 嵌入式系統(tǒng) > 設計應用 > 2440/2410上將usb device改成usb host

          2440/2410上將usb device改成usb host

          作者: 時間:2016-11-09 來源:網絡 收藏
          之前的開發(fā),要在2440上使用兩個usb host口,一個接攝像頭,一個接無線網卡。但友善之臂mini2440板子只有一個usb host口,曾想通過外接一個usb hub來解決,無線網卡接hub沒有問題,但是攝像頭插到hub上總是有錯誤:

          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

          本文引用地址:http://www.ex-cimer.com/article/201611/317619.htm

          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。



          關鍵詞: 24402410usbdevicehos

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