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。
/******************************************************************************
* 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.c
static 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, |
}, |
}; |
V
static 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]) |
