diff options
| author | Stephen Warren <swarren@nvidia.com> | 2014-04-30 15:09:57 -0600 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2014-05-15 00:21:17 +0200 |
| commit | a4539a2aa7bde003d4318b1b2e21fd217cc2899f (patch) | |
| tree | 8197bd3aa83a73a49af74c71a37c13aa99683e79 /arch | |
| parent | 2d34151f7501ddaa599897f0d89ad576126b03eb (diff) | |
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')
| -rw-r--r-- | arch/arm/include/asm/arch-tegra/usb.h | 2 |
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 ceb7bcd9cf..c817088fa5 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); |