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Amelie Delaunay 17f934024e usb: dwc2: override PHY input signals with usb role switch support

This patch adds support for usb role switch to dwc2, by using overriding
control of the PHY voltage valid and ID input signals.

iddig signal (ID) can be overridden:
- when setting GUSBCFG_FORCEHOSTMODE, iddig input pin is overridden with 1;
- when setting GUSBCFG_FORCEDEVMODE, iddig input pin is overridden with 0.

avalid/bvalid/vbusvalid signals can be overridden respectively with:
- GOTGCTL_AVALOEN + GOTGCTL_AVALOVAL
- GOTGCTL_BVALOEN + GOTGCTL_BVALOVAL
- GOTGCTL_VBVALEN + GOTGCTL_VBVALOVAL

It is possible to determine valid sessions thanks to usb role switch:
- if USB_ROLE_NONE then !avalid && !bvalid && !vbusvalid
- if USB_ROLE_DEVICE then !avalid && bvalid && vbusvalid
- if USB_ROLE_HOST then avalid && !bvalid && vbusvalid

Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

2020-10-02 13:29:13 +03:00

995 B

Raw Blame History

SPDX-License-Identifier: GPL-2.0

ccflags-$(CONFIG_USB_DWC2_DEBUG) += -DDEBUG ccflags-$(CONFIG_USB_DWC2_VERBOSE) += -DVERBOSE_DEBUG

obj-$(CONFIG_USB_DWC2) += dwc2.o dwc2-y := core.o core_intr.o platform.o drd.o dwc2-y += params.o

ifneq ($(filter y,$(CONFIG_USB_DWC2_HOST) $(CONFIG_USB_DWC2_DUAL_ROLE)),) dwc2-y += hcd.o hcd_intr.o dwc2-y += hcd_queue.o hcd_ddma.o endif

ifneq ($(filter y,$(CONFIG_USB_DWC2_PERIPHERAL) $(CONFIG_USB_DWC2_DUAL_ROLE)),) dwc2-y += gadget.o endif

ifneq ($(CONFIG_DEBUG_FS),) dwc2-y += debugfs.o endif

NOTE: The previous s3c-hsotg peripheral mode only driver has been moved to

this location and renamed gadget.c. When building for dynamically linked

modules, dwc2.ko will get built for host mode, peripheral mode, and dual-role

mode. The PCI bus interface module will called dwc2_pci.ko and the platform

interface module will be called dwc2_platform.ko.

obj-$(CONFIG_USB_DWC2_PCI) += dwc2_pci.o dwc2_pci-y := pci.o

995 B Raw Blame History