ARM: tegra: shut down USB device controller at boot
When loading U-Boot into RAM over USB protocols using tools such as
tegrarcm or L4T's exec-uboot.sh/tegraflash.py, Tegra's USB device
mode controller is initialized and enumerated by the host PC running
the tool. Unfortunately, these tools do not shut down the USB
controller before executing the downloaded code, and so the host PC
does not "de-enumerate" the USB device. This patch implements optional
code to shut down the USB controller when U-Boot boots to avoid leaving
a stale USB device present.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index 48a387c..0b2852c 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -52,6 +52,19 @@
endchoice
+config TEGRA_DISCONNECT_UDC_ON_BOOT
+ bool "Disconnect USB device mode controller on boot"
+ default y
+ help
+ When loading U-Boot into RAM over USB protocols using tools such as
+ tegrarcm or L4T's exec-uboot.sh/tegraflash.py, Tegra's USB device
+ mode controller is initialized and enumerated by the host PC running
+ the tool. Unfortunately, these tools do not shut down the USB
+ controller before executing the downloaded code, and so the host PC
+ does not "de-enumerate" the USB device. This option shuts down the
+ USB controller when U-Boot boots to avoid leaving a stale USB device
+ present.
+
config SYS_MALLOC_F_LEN
default 0x1800
diff --git a/arch/arm/mach-tegra/board2.c b/arch/arm/mach-tegra/board2.c
index a650abd..60e19c8 100644
--- a/arch/arm/mach-tegra/board2.c
+++ b/arch/arm/mach-tegra/board2.c
@@ -34,8 +34,8 @@
#ifdef CONFIG_TEGRA_CLOCK_SCALING
#include <asm/arch/emc.h>
#endif
-#ifdef CONFIG_USB_EHCI_TEGRA
#include <asm/arch-tegra/usb.h>
+#ifdef CONFIG_USB_EHCI_TEGRA
#include <usb.h>
#endif
#ifdef CONFIG_TEGRA_MMC
@@ -201,6 +201,14 @@
int board_early_init_f(void)
{
+#if defined(CONFIG_TEGRA_DISCONNECT_UDC_ON_BOOT)
+#define USBCMD_FS2 (1 << 15)
+ {
+ struct usb_ctlr *usbctlr = (struct usb_ctlr *)0x7d000000;
+ writel(USBCMD_FS2, &usbctlr->usb_cmd);
+ }
+#endif
+
/* Do any special system timer/TSC setup */
#if defined(CONFIG_TEGRA_SUPPORT_NON_SECURE)
if (!tegra_cpu_is_non_secure())