2440/2410上将usb device改成usb host

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2009-08-11 16:35
之前的开发,要在2440上使用两个usb host口,一个接摄像头,一个接无线网卡。但友善之臂mini2440板子只有一个usb host口,曾想通过外接一个usb hub来解决,无线网卡接hub没有问题,但是摄像头插到hub上总是有错误:

          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

本来想试着修改内核中关于hub.c和ohci-s3c2410中的代码,看看能不能好使,但后来在PC机上的hub下使用摄像头也不好使,看来是我使用的zc301摄像头对hub不支持吧。(估计一般的摄像头都对hub不支持,我又试了另一款也是这样的)。

    所以放弃了在usb hub上使用摄像头的想法。记得以前看过关于s3c2410的手册,它应该是支持2个usb host通道的啊,2440应该也是如此。所以仔细看了下s3c2440的手册,发现第二个usb hos通道的管脚和usb device的管脚是复用的。所以感觉将usb device改成host应该是可行的,深入研究研究。(好像一些板子已经设计出来可以跳线选择,友善之臂的没这么设计)

    要将usb device改成host,不只是硬件上需要改动,软件驱动上肯定也需要改动,所以分为硬件和软件两个部分。

    硬件上:仔细看了mini2440的手册中的关于usb电路图,其实硬件电路上host和device没什么本质区别,一些外拉电阻不一样,VBUS的提供者不一样。将device改成host感觉外拉电阻不一样应该也不会影响使用,所以就没有改变,避免在板子上做手脚。其它的就是要给VBUS一个5v的电源,而不是像device一样电脑供电了。其它的就没什么改动了。自己动手做了一个usb host口。

    软件上:本质就是对寄存器MISCCR的设置改变一下,为了以后改动方便,我参考了网上的一些《关于阳初2440 超值版只能使用一个 USB Host 问题的解决》的方法。以下主要参照了一些关于这个方法的帖子博客之类的。(转载一些)

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 = "can't allocate hub irq buffer";

          ret = -ENOMEM;

          goto fail;

       }

       hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);

       if (!hub->status) {

          message = "can't 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 = "can't 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 = "can't 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寄存器没有正确设置的缘故,我在mach-2410.c中增加了设置MISCCR寄存器的内容,HOST0就可以正常使用了

    /*add by seigpao*/

    int usb_seigpao_init(void)

    {

      unsigned long upllvalue;

      unsigned long misccr;

      //设置UPLLCON

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

      __raw_writel(upllvalue,S3C2410_UPLLCON);

      //设置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*/

        //设置2410触摸屏

        set_s3c2410ts_info(&sbc2410_ts_cfg);

        //设置USB相关寄存器

        usb_seigpao_init();

        /* end by seigpao */

     }

    不知道为什么会有第二篇,感觉不适合,所以又重网上找了另一篇文章。

修改ohci-s3c2440.c文件(含头文件):


    #include <asm/hardware.h>


    #include <asm/hardware/clock.h>


    #include <asm/arch/usb-control.h>

    /*add here*/


    #include <asm/arch/regs-clock.h>


    #include <linux/device.h>


    #include <linux/delay.h>

    #include <asm/arch/regs-gpio.h>


    /*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);

          }


}


     }

     使用了这篇文章的改动。头文件位置可能根据内核不同做相应改动。我的2.6.29内核中的regs-clock.h和regs-gpio.h是在arch\arm\mach-s3c2410\include\mach中。我拷贝两个头文件到本地drivers/usb/host/,include 变成""。

    然后make zImage,之后Kconfig会重新选择,

    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)

   最后一项选的时候选成2就行了,因为config MAX_ROOT_PORTS为2代表使用两个host。

   烧写生成的内核,结果大失所望,启动后在自己焊出的usb host口上插上设备没反应。不过郁闷重启之时,发现先在这之上插上设备启动时,设备就能识别出来了。而且插入无线网卡可以配置使用。不过使用摄像头确出现错误:

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。这是又回到对内核的改动上,当改动内核时就感觉帖子文章中第二篇没什么用,跟第一篇有些重复之嫌,后来替代的在static void s3c2410_start_hc中的改动也是,感觉有些重复static int usb_hcd_s3c2410_probe中的内容,所以重新编译内核,将对static void s3c2410_start_hc的改动去掉,即不改s3c2410_start_hc,重新编译内核烧写,结果使用摄像头正常。

    也就是说,usb device已经改成了usb host,可以当成usb host使用了,只不过,必需先插入设备再启动板子,分析这种情况的原因可能是因为bootloader中肯定有对usb部分的设置驱动之类的,(Nor Flash的时候可以使用usb device进行下载传输,说明肯定已经驱上了usb device),vivi的设置跟重新编译的内核对usb设置不一样,可能就导致了这种情况,我也不确定是不是这个原因。不插设备的时候启动信息改的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,插上设备比如无线网卡,就能找到设备,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

对于这种情况,上网搜了一下,好像修改vivi中的upll设置,在main中添加了ChangeUPllValue(56,2,2)一句后,问题可以解决。具体没有再试,先如此的用着吧。
    我是在友善之臂的mini2440上实现的,基于2410与2440没有本质差别,2410上应该也可以。

转载自 http://hi.baidu.com/weili8607/blog/item/301f2550eed26110367abebe.html