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authorStephen Warren <swarren@nvidia.com>2014-04-30 21:09:57 (GMT)
committerMarek Vasut <marex@denx.de>2014-05-14 22:21:17 (GMT)
commita4539a2aa7bde003d4318b1b2e21fd217cc2899f (patch)
tree8197bd3aa83a73a49af74c71a37c13aa99683e79 /arch/arm
parent2d34151f7501ddaa599897f0d89ad576126b03eb (diff)
downloadu-boot-a4539a2aa7bde003d4318b1b2e21fd217cc2899f.tar.xz
usb: tegra: support device mode
A few changes are made to the Tegra EHCI driver so that it can set everything up for device-mode operation on the first USB controller. This can be used in conjunction with ci_udc.c to operate as a USB device. Detailed changes are: * Rename set_host_mode() to set_up_vbus() since that's really what it does. * Modify set_up_vbus() to know whether it's initializing in host or device mode, and: - Skip the external VBUS check in device mode, since external VBUS is expected in this case. - Disable VBUS output in device mode. * Modify init_phy_mux() to know whether it's initializing in host or device mode, and hence skip setting USBMODE_CM_HC (which enables host mode) in device mode. See the comments in that function for why this is safe w.r.t. the ordering requirements of PHY selection. * Modify init_utmi_usb_controller() to force "b session valid" in device mode, since the HW requires this. This is done in UTMI-specific code, since we only support device mode on the first USB controller, and that controller can only talk to a UTMI PHY. * Enhance ehci_hcd_init() to error-check the requested host-/device-mode vs. the dr_mode (dual-role mode) value present in device tree, and the HW configurations which support device mode. * Enhance ehci_hcd_init() not to skip HW initialization when switching between host and device mode on a controller. This requires remembering which mode the last initialization used. Cc: Jim Lin <jilin@nvidia.com> Cc: Stefan Agner <stefan@agner.ch> Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/include/asm/arch-tegra/usb.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-tegra/usb.h b/arch/arm/include/asm/arch-tegra/usb.h
index ceb7bcd..c817088 100644
--- a/arch/arm/include/asm/arch-tegra/usb.h
+++ b/arch/arm/include/asm/arch-tegra/usb.h
@@ -349,6 +349,8 @@ struct usb_ctlr {
/* USB3_IF_USB_PHY_VBUS_SENSORS_0 */
#define VBUS_VLD_STS (1 << 26)
+#define VBUS_B_SESS_VLD_SW_VALUE (1 << 12)
+#define VBUS_B_SESS_VLD_SW_EN (1 << 11)
/* Setup USB on the board */
int usb_process_devicetree(const void *blob);