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imx: add macro to detect whether USB has been initialized

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This macro allows to detect whether the boot ROM initialized USB
already (serial downloader). This is helpful to reliably detect
if the system has been recovered via USB serial downloader.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
This commit is contained in:
Stefan Agner 2018-05-30 19:01:45 +02:00 committed by Stefano Babic
parent c7f367bc8d
commit 23eaf4180f
1 changed files with 7 additions and 0 deletions
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7
arch/arm/include/asm/arch-mx6/imx-regs.h
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@ -996,5 +996,12 @@ struct pwm_regs {
u32 pr;
u32 cnr;
};
/*
* If ROM fail back to USB recover mode, USBPH0_PWD will be clear to use USB
* If boot from the other mode, USB0_PWD will keep reset value
*/
#define is_boot_from_usb(void) (!(readl(USB_PHY0_BASE_ADDR) & (1<<20)))
#endif /* __ASSEMBLER__*/
#endif /* __ASM_ARCH_MX6_IMX_REGS_H__ */