From 23eaf4180f9ff6f3898e0199e56cfcb563d2eb74 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan.agner@toradex.com>
Date: Wed, 30 May 2018 19:01:45 +0200
Subject: [PATCH] imx: add macro to detect whether USB has been initialized
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>
---
arch/arm/include/asm/arch-mx6/imx-regs.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/arm/include/asm/arch-mx6/imx-regs.h b/arch/arm/include/asm/arch-mx6/imx-regs.h
index 431439218d..4f01b20aed 100644
--- a/arch/arm/include/asm/arch-mx6/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx6/imx-regs.h
@@ -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__ */
--
2.39.5