Hi Stefan,
On 09/08/2017 04:35 PM, Stefan Agner wrote:
From: Stefan Agner stefan.agner@toradex.com
This macro allows to detect whether the USB PHY is active. This is helpful to detect if the boot ROM has previously started the USB serial downloader.
The idea is taken from the mfgtool support in the NXP U-Boot: http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/commit/?h=imx_v2016....
Signed-off-by: Stefan Agner stefan.agner@toradex.com Acked-by: Marcel Ziswiler marcel.ziswiler@toradex.com Tested-by: Fabio Estevam fabio.estevam@nxp.com
Changes in v2:
Move macro to sys_proto.h
Renamed from is_boot_from_usb() to is_usbphy_active()
Use defines for register offset and field
Remove tab after define
Remove comment since the actual "magic" is happening and documented at usage side
arch/arm/include/asm/arch-mx6/sys_proto.h | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/arm/include/asm/arch-mx6/sys_proto.h b/arch/arm/include/asm/arch-mx6/sys_proto.h index 14f5d948c9..9d4b1d6768 100644 --- a/arch/arm/include/asm/arch-mx6/sys_proto.h +++ b/arch/arm/include/asm/arch-mx6/sys_proto.h @@ -6,3 +6,10 @@ */
#include <asm/mach-imx/sys_proto.h>
+#define USBPHY_PWD 0x00000000
+#define USBPHY_PWD_RXPWDRX (1 << 20) /* receiver block power down */
At least MX6 and MX7 have USB Host PHY as well as USB OTG.
How about is_otgphy_active() instead?
+#define is_usbphy_active(void) (!(readl(USB_PHY0_BASE_ADDR + USBPHY_PWD) & \
USBPHY_PWD_RXPWDRX))