[U-Boot] [PATCH V5 02/18] usb: ehci-mx6: add support for host mode otg port

[Troy Kisky <troy.kisky@boundarydevices.com>]

On 9/27/2013 10:50 AM, Marek Vasut wrote:
> Dear Troy Kisky,
>
>> Previously, only host1 was supported using an index of 0.
>> Now, otg has index 0, host1 is 1, host2 is 2, host3 is 3.
>> Since OTG requires usbmode to be set after reset, I added
>> CONFIG_EHCI_HCD_INIT_AFTER_RESET to nitrogen6x.h and
>> mx6qsabreauto.h.
>>
>> I also added a weak function board_ehci_power to handle
>> turning power on/off for otg.
>>
>> Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
>>
>> ---
>> V4: new patch, replaces "usb: gadget: mv_udc: fix hardware udc address for
>> i.MX6" and has the bonus of giving OTG host mode support
>>
>> V5: use CONFIG_EHCI_HCD_INIT_AFTER_RESET instead of a weak function.
>> Return error if otg_id is high.
>> ---
>>   drivers/usb/host/ehci-mx6.c     | 123
>> +++++++++++++++++++++++++++------------- include/configs/mx6qsabreauto.h |
>>    3 +-
>>   include/configs/nitrogen6x.h    |   3 +-
>>   3 files changed, 87 insertions(+), 42 deletions(-)
>>
>> diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c
>> index eb24af5..ff4424d 100644
>> --- a/drivers/usb/host/ehci-mx6.c
>> +++ b/drivers/usb/host/ehci-mx6.c
>> @@ -35,6 +35,7 @@
>>   #define USBPHY_CTRL_CLKGATE			0x40000000
>>   #define USBPHY_CTRL_ENUTMILEVEL3		0x00008000
>>   #define USBPHY_CTRL_ENUTMILEVEL2		0x00004000
>> +#define USBPHY_CTRL_OTD_ID_BIT			27
> Why is this anarchism used here? Why is it not defined as the rest of the
> values? Btw. its OTG_ID_VALUE , not OTD.

Good catch on the typo!

> [...]
>
>> @@ -123,31 +156,36 @@ static int usbh1_phy_enable(void)
>>   	/* Power up the PHY */
>>   	__raw_writel(0, phy_reg + USBPHY_PWD);
>>   	/* enable FS/LS device */
>> -	val = __raw_readl(phy_reg + USBPHY_CTRL);
>> +	val = __raw_readl(phy_ctrl);
>>   	val |= (USBPHY_CTRL_ENUTMILEVEL2 | USBPHY_CTRL_ENUTMILEVEL3);
>> -	__raw_writel(val, phy_reg + USBPHY_CTRL);
>> +	__raw_writel(val, phy_ctrl);
>>
>> -	return 0;
>> +	return (val >> USBPHY_CTRL_OTD_ID_BIT) & 1;
> See above, you can use return (val & USBPHY_CTRL_OTG_ID_VALUE); here instead.

Yes, I can do that, and also change my documentation along with it.

>
>>   }
>>
>> -static void usbh1_oc_config(void)
>> +struct usbnc_regs {
>> +	u32	ctrl[4];	/* otg/host1-3 */
> This won't scale. Align this with the # of controllers you claim you have here,
> why dont you?

You've lost me here. Can you post the struct you'd like to see?

>
> [...]
>
>> diff --git a/include/configs/mx6qsabreauto.h
>> b/include/configs/mx6qsabreauto.h index 5530fc6..9e48a49 100644
>> --- a/include/configs/mx6qsabreauto.h
>> +++ b/include/configs/mx6qsabreauto.h
>> @@ -23,7 +23,8 @@
>>   #define CONFIG_USB_STORAGE
>>   #define CONFIG_USB_HOST_ETHER
>>   #define CONFIG_USB_ETHER_ASIX
>> -#define CONFIG_MXC_USB_PORT	1
>> +#define CONFIG_USB_MAX_CONTROLLER_COUNT 2
>> +#define CONFIG_EHCI_HCD_INIT_AFTER_RESET	/* For OTG port */
>>   #define CONFIG_MXC_USB_PORTSC	(PORT_PTS_UTMI | PORT_PTS_PTW)
>>   #define CONFIG_MXC_USB_FLAGS	0
>>
>> diff --git a/include/configs/nitrogen6x.h b/include/configs/nitrogen6x.h
>> index 3454b86..2e5ae13 100644
>> --- a/include/configs/nitrogen6x.h
>> +++ b/include/configs/nitrogen6x.h
>> @@ -119,7 +119,8 @@
>>   #define CONFIG_USB_HOST_ETHER
>>   #define CONFIG_USB_ETHER_ASIX
>>   #define CONFIG_USB_ETHER_SMSC95XX
>> -#define CONFIG_MXC_USB_PORT	1
>> +#define CONFIG_USB_MAX_CONTROLLER_COUNT 2
>> +#define CONFIG_EHCI_HCD_INIT_AFTER_RESET	/* For OTG port */
>>   #define CONFIG_MXC_USB_PORTSC	(PORT_PTS_UTMI | PORT_PTS_PTW)
>>   #define CONFIG_MXC_USB_FLAGS	0
> Does this patch do two things here ? I think it does, if I'm right, split this
> board adjustment away please.
>
>

If I split this, USB will stop working between the 2 patches. The OTG 
port will be initialized
instead of the main USB port, and it won't work because it requires 
CONFIG_EHCI_HCD_INIT_AFTER_RESET.

BR

Troy