/*******************************************************************************            I.MX6 make menuconfig OTG to slave only mode* 声明：*     本文通过跟踪代码的方式来了解如何将I.MX6的OTG的Host模式去掉，仅仅剩下* slave模式，主要是有些场合仅仅需要slave模式。**                                      2015-9-5 晴 深圳 南山平山村 曾剑锋*****************************************************************************/<kernel path>/drivers/usb/otg/fsl_otg.cstatic int __init fsl_usb_otg_init(void)       <----------------------------+{                                                                           |printk(KERN_INFO DRIVER_DESC " loaded, %s\n", DRIVER_VERSION);          |return platform_driver_register(&fsl_otg_driver);                       |}                                             |                             ||                             |static void __exit fsl_usb_otg_exit(void)     +-------------+               |{                                                           |               |platform_driver_unregister(&fsl_otg_driver);            |               |printk(KERN_INFO DRIVER_DESC " unloaded\n");            |               |}                                                           |               ||               |subsys_initcall(fsl_usb_otg_init);      --------------------|---------------+module_exit(fsl_usb_otg_exit);                              ||MODULE_DESCRIPTION(DRIVER_INFO);                            |MODULE_AUTHOR(DRIVER_AUTHOR);                               |MODULE_LICENSE("GPL");                                      |||struct platform_driver fsl_otg_driver = {     <-------------+.probe = fsl_otg_probe,.remove = fsl_otg_remove,.driver = {.name = driver_name,    --------+.owner = THIS_MODULE,           |},                                  |};                                      |Vstatic const char driver_name[] = "fsl-usb2-otg";    -------------+||
<kernel path>/arch/arm$ grep fsl-usb2-otg * -R                        |Binary file boot/Image matches                                    |mach-mx5/devices.c:    .name = "fsl-usb2-otg",                    |......                                                            |Binary file plat-mxc/devices/built-in.o matches                   V
-+- plat-mxc/devices/platform-fsl-usb2-otg.c:    const char *name = "fsl-usb2-otg";|  Binary file plat-mxc/built-in.o matches                                    |+--------------------------------------------+                                |V                                |
<kernel path>/arch/arm/plat-mxc/devices/platform-fsl-usb2-otg.c                |#define imx_fsl_usb2_otg_data_entry_single(soc)             \              |{                               \                                      |.iobase = soc ## _USB_OTG_BASE_ADDR,            \                  |.irq = soc ## _INT_USB_OTG,             \                          |}                                                                      |||#ifdef CONFIG_SOC_IMX6Q                                                    |const struct imx_fsl_usb2_otg_data imx6q_fsl_usb2_otg_data __initconst =   |imx_fsl_usb2_otg_data_entry_single(MX6Q);                              |#endif /* ifdef CONFIG_SOC_IMX6Q */                                        ||struct platform_device *__init imx_add_fsl_usb2_otg(         ----------+   |const struct imx_fsl_usb2_otg_data *data,                      |   |const struct fsl_usb2_platform_data *pdata)                    |   |{                                                                      |   |struct resource res[] = {                                          |   |{                                                              |   |.start = data->iobase,                                     |   |.end = data->iobase + SZ_512 - 1,                          |   |.flags = IORESOURCE_MEM,                                   |   |}, {                                                           |   |.start = data->irq,                                        |   |.end = data->irq,                                          |   |.flags = IORESOURCE_IRQ,                                   |   |},                                                             |   |};                                                                 |   ||   |int ret = -ENOMEM;                                                 |   |const char *name = "fsl-usb2-otg";       <-------------------------|---+int id = -1;                                                       |unsigned int num_resources = ARRAY_SIZE(res);                      |size_t size_data = sizeof(*pdata);                                 |u64 dmamask = DMA_BIT_MASK(32);                                    |struct platform_device *pdev;                                      ||pdev = platform_device_alloc(name, id);                            |if (!pdev)                                                         |goto err;                                                      ||if (dmamask) {                                                     |/*                                                             |* This memory isn't freed when the device is put,             |* I don't have a nice idea for that though.  Conceptually     |* dma_mask in struct device should not be a pointer.          |* See http://thread.gmane.org/gmane.linux.kernel.pci/9081     |*/                                                            |pdev->dev.dma_mask =                                           |kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);          |if (!pdev->dev.dma_mask)                                       |/* ret is still -ENOMEM; */                                |goto err;                                                  ||*pdev->dev.dma_mask = dmamask;                                 |pdev->dev.coherent_dma_mask = dmamask;                         |}                                                                  ||ret = platform_device_add_resources(pdev, res, num_resources);     |if (ret)                                                           |goto err;                                                      ||if (data) {                                                        |ret = platform_device_add_data(pdev, pdata, size_data);        |if (ret)                                                       |goto err;                                                  |}                                                                  ||return pdev;                                                       |err:                                                                   |if (dmamask)                                                   |kfree(pdev->dev.dma_mask);                                 |platform_device_put(pdev);                                     |return ERR_PTR(ret);                                           |}                                                                      |EXPORT_SYMBOL(imx_add_fsl_usb2_otg);                                   ||
<kernel path>/arch/arm$ grep imx_add_fsl_usb2_otg * -R       <-------------+Binary file boot/Image matches
-+- mach-mx6/devices-imx6q.h:    imx_add_fsl_usb2_otg(&imx6q_fsl_usb2_otg_data, pdata)   ----------+|  ......                                                                                         ||  plat-mxc/devices/platform-fsl-usb2-otg.c:struct platform_device *__init imx_add_fsl_usb2_otg(  ||  plat-mxc/devices/platform-fsl-usb2-otg.c:EXPORT_SYMBOL(imx_add_fsl_usb2_otg);                  ||  Binary file plat-mxc/built-in.o matches                                                        |+----------------------------------+                                                              |V                                                              |
<kernel path>/arch/arm/mach-mx6/devices-imx6q.h                                                    |extern const struct imx_fsl_usb2_otg_data imx6q_fsl_usb2_otg_data __initconst;                 |#define imx6q_add_fsl_usb2_otg(pdata)   \                            -------------------+      |imx_add_fsl_usb2_otg(&imx6q_fsl_usb2_otg_data, pdata)            <------------------*------+|
<kernel path>/arch/arm$ grep imx6q_add_fsl_usb2_otg * -R                                    |Binary file mach-mx6/.usb_dr.c.swp matches                                              |mach-mx6/devices-imx6q.h:#define imx6q_add_fsl_usb2_otg(pdata)    \                     |mach-mx6/devices-imx6q.h:#define imx6q_add_fsl_usb2_otg_wakeup(pdata)    \              |mach-mx6/usb_dr.c:    pdev[i] = imx6q_add_fsl_usb2_otg(&dr_utmi_config);                |mach-mx6/usb_dr.c:    pdev_wakeup = imx6q_add_fsl_usb2_otg_wakeup(&dr_wakeup_config);   ||
<kernel path>/arch/arm/mach-mx6/usb_dr.c                                                    |static int  __init mx6_usb_dr_init(void)                                                |{                                                                                       |int i = 0;                                                                          |void __iomem *anatop_base_addr = MX6_IO_ADDRESS(ANATOP_BASE_ADDR);                  |struct imx_fsl_usb2_wakeup_data imx6q_fsl_otg_wakeup_data =                         |imx_fsl_usb2_wakeup_data_entry_single(MX6Q, 0, OTG);                            |struct imx_mxc_ehci_data __maybe_unused imx6q_mxc_ehci_otg_data =                   |imx_mxc_ehci_data_entry_single(MX6Q, 0, OTG);                                   |struct imx_fsl_usb2_udc_data __maybe_unused imx6q_fsl_usb2_udc_data =               |imx_fsl_usb2_udc_data_entry_single(MX6Q);                                       |struct imx_fsl_usb2_otg_data __maybe_unused imx6q_fsl_usb2_otg_data  =              |imx_fsl_usb2_otg_data_entry_single(MX6Q);                                       ||/* Some phy and power's special controls for otg                                    |* 1. The external charger detector needs to be disabled                            |* or the signal at DP will be poor                                                 |* 2. The EN_USB_CLKS is always enabled.                                            |* The PLL's power is controlled by usb and others who                              |* use pll3 too.                                                                    |*/                                                                                 |__raw_writel(BM_ANADIG_USB1_CHRG_DETECT_EN_B  \                                     || BM_ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B,  \                                 |anatop_base_addr + HW_ANADIG_USB1_CHRG_DETECT);                             |__raw_writel(BM_ANADIG_USB1_PLL_480_CTRL_EN_USB_CLKS,                               |anatop_base_addr + HW_ANADIG_USB1_PLL_480_CTRL_SET);                        |mx6_get_otghost_vbus_func(&mx6_set_usb_otg_vbus);                                   |dr_utmi_config.platform_driver_vbus = mx6_set_usb_otg_vbus;                         ||#ifdef CONFIG_USB_OTG                                                                   |/* wake_up_enable is useless, just for usb_register_remote_wakeup execution*/       |dr_utmi_config.wake_up_enable = _device_wakeup_enable;                              |dr_utmi_config.operating_mode = FSL_USB2_DR_OTG;                                    |dr_utmi_config.wakeup_pdata = &dr_wakeup_config;                                    |pdev[i] = imx6q_add_fsl_usb2_otg(&dr_utmi_config);         <------------------------+dr_wakeup_config.usb_pdata[i] = pdev[i]->dev.platform_data;i++;#endif#ifdef CONFIG_USB_EHCI_ARC_OTG                                 -------------------------+dr_utmi_config.operating_mode = DR_HOST_MODE;                                       |dr_utmi_config.wake_up_enable = _host_wakeup_enable;                                |if (usb_icbug_swfix_need()) {                                                       |dr_utmi_config.platform_rh_suspend = _host_platform_rh_suspend_swfix;           |dr_utmi_config.platform_rh_resume  = _host_platform_rh_resume_swfix;            |} else {                                                                            |dr_utmi_config.platform_rh_suspend = _host_platform_rh_suspend;                 |dr_utmi_config.platform_rh_resume  = _host_platform_rh_resume;                  |}                                                                                   |dr_utmi_config.platform_set_disconnect_det = fsl_platform_otg_set_usb_phy_dis;      |dr_utmi_config.phy_lowpower_suspend = _host_phy_lowpower_suspend;                   |dr_utmi_config.is_wakeup_event = _is_host_wakeup;                                   |dr_utmi_config.wakeup_pdata = &dr_wakeup_config;                                    |dr_utmi_config.wakeup_handler = host_wakeup_handler;                                |dr_utmi_config.platform_phy_power_on = dr_platform_phy_power_on;                    |pdev[i] = imx6q_add_fsl_ehci_otg(&dr_utmi_config);                                  |dr_wakeup_config.usb_pdata[i] = pdev[i]->dev.platform_data;                         |i++;                                                                                |#endif                                                                                  |#ifdef CONFIG_USB_GADGET_ARC                                                            |dr_utmi_config.operating_mode = DR_UDC_MODE;                                        |dr_utmi_config.wake_up_enable = _device_wakeup_enable;                              |dr_utmi_config.platform_rh_suspend = NULL;                                          |dr_utmi_config.platform_rh_resume  = NULL;                                          |dr_utmi_config.platform_set_disconnect_det = NULL;                                  |dr_utmi_config.phy_lowpower_suspend = _device_phy_lowpower_suspend;                 |dr_utmi_config.is_wakeup_event = _is_device_wakeup;                                 |dr_utmi_config.wakeup_pdata = &dr_wakeup_config;                                    |dr_utmi_config.wakeup_handler = device_wakeup_handler;                              |dr_utmi_config.charger_base_addr = anatop_base_addr;                                |dr_utmi_config.platform_phy_power_on = dr_platform_phy_power_on;                    |pdev[i] = imx6q_add_fsl_usb2_udc(&dr_utmi_config);                                  |dr_wakeup_config.usb_pdata[i] = pdev[i]->dev.platform_data;                         |i++;                                                                                |#endif                                                                                  |devnum = i;                                                                         |/* register wakeup device */                                                        |pdev_wakeup = imx6q_add_fsl_usb2_otg_wakeup(&dr_wakeup_config);                     |for (i = 0; i < devnum; i++) {                                                      |platform_device_add(pdev[i]);                                                   |((struct fsl_usb2_platform_data *)(pdev[i]->dev.platform_data))->wakeup_pdata = |(struct fsl_usb2_wakeup_platform_data *)(pdev_wakeup->dev.platform_data);   |}                                                                                   ||return 0;                                                                           |}                                                                                       |module_init(mx6_usb_dr_init);                                                           ||
<kernel path>$ make menuconfig                                                              || Symbol: USB_EHCI_ARC_OTG [=n]     <--------------------------------*--------------------+│ Type  : boolean                                                    |│ Prompt: Support for DR host port on Freescale controller           |│   Defined at drivers/usb/host/Kconfig:80                           |│   Depends on: USB_SUPPORT [=y] && USB_EHCI_ARC [=y]                |│   Location:                                                        |│     -> Device Drivers                                              |│       -> USB support (USB_SUPPORT [=y])                            |│         -> Support for Freescale controller (USB_EHCI_ARC [=y])    |