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imx: add macro to detect whether USB PHY is active

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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_v2016.03_4.1.15_2.0.0_ga&id=a352ed3c5184b95c4c9f7468f5fbb5f43de5e412

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>
Reviewed-by: Eric Nelson <eric@nelint.com>
(cherry picked from commit 7d289d6239)
This commit is contained in:
Stefan Agner 2017-09-13 14:29:44 -07:00 committed by Otavio Salvador
parent ed4d1d9811
commit 5615ed0835
1 changed files with 7 additions and 0 deletions
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7
arch/arm/include/asm/arch-mx6/sys_proto.h
View File

@ -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 */
#define is_usbotg_phy_active(void) (!(readl(USB_PHY0_BASE_ADDR + USBPHY_PWD) & \
USBPHY_PWD_RXPWDRX))