[U-Boot] [PATCH v3 1/3] usb:ehci-mx6 add board_usb_phy_mode function

[Marek Vasut <marex@denx.de>]

On Friday, November 07, 2014 at 02:08:12 AM, Peng Fan wrote:
> Include a weak function board_usb_phy_mode.
> 
> usb_phy_enable decide whether the controller in device mode or in host mode
> by '*phy_ctrl & USBPHY_CTRL_OTG_ID'.
> 
> There are two usb port on mx6sxsabresd and also mx6slevk.
> 1. OTG port
> 2. HOST port
> There are connected to SOC USB controller OTG1 core and OTG2 core as
> following: OTG1 core <----> board OTG port
> OTG2 core <----> board HOST port

This patch has nothing to do with any board, so this part should not
be in the commit message.

> However to these two board, no ID pin for the board host port. If only use
> '*phy_ctrl & USBPHY_CTRL_OTG_ID' to decide the work mode, the host port
> will not work, because "type = usb_phy_enable(index, ehci) ?
> USB_INIT_DEVICE : USB_INIT_HOST;" will always set 'type' with
> USB_INIT_DEVICE.
> 
> So introduce this weak function to let board level code can decide to work
> in host or device mode, if board level code want to implement this
> function.
> 
> Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
> Signed-off-by: Ye Li <B37916@freescale.com>
> ---
> 
> Changes v3:
>  Take Marek's suggestions, replace 'return val & USBPHY_CTRL_OTG_ID' with
>  this new function like 'return board_usb_phy_mode(index);'
>  Here board_usb_phy_mode only has one parameter 'index' as board_ehci_power
> and board_echi_hcd_init do.
>  "http://lists.denx.de/pipermail/u-boot/2014-November/194183.html" has
> detailed discussion.
> 
> Changes v2:
>  Introduce a new weak function to let board have a choice to decide which
> mode to work at.
> 
>  drivers/usb/host/ehci-mx6.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c
> index 9ec5a0a..e2a247e 100644
> --- a/drivers/usb/host/ehci-mx6.c
> +++ b/drivers/usb/host/ehci-mx6.c
> @@ -113,6 +113,20 @@ static void usb_power_config(int index)
>  		     pll_480_ctrl_set);
>  }
> 
> +int __weak board_usb_phy_mode(int port)
> +{
> +	void __iomem *phy_reg;
> +	void __iomem *phy_ctrl;
> +	u32 val;
> +
> +	phy_reg = (void __iomem *)phy_bases[port];
> +	phy_ctrl = (void __iomem *)(phy_reg + USBPHY_CTRL);
> +
> +	val = __raw_readl(phy_ctrl);
> +
> +	return val & USBPHY_CTRL_OTG_ID;
> +}
> +
>  /* Return 0 : host node, <>0 : device mode */
>  static int usb_phy_enable(int index, struct usb_ehci *ehci)
>  {
> @@ -160,7 +174,7 @@ static int usb_phy_enable(int index, struct usb_ehci
> *ehci) val |= (USBPHY_CTRL_ENUTMILEVEL2 | USBPHY_CTRL_ENUTMILEVEL3);
>  	__raw_writel(val, phy_ctrl);
> 
> -	return val & USBPHY_CTRL_OTG_ID;
> +	return board_usb_phy_mode(index);

This should be called from ehci_hcd_init() right after usb_phy_enable().
Afterall, the mode detection has nothing to do with the PHY enabling.

btw. an idea for a separate patch(set) -- the PHY registers should be
converted to struct-based access.

>  }
> 
>  /* Base address for this IP block is 0x02184800 */