Commit 398aa9a7 authored by Manan Aurora's avatar Manan Aurora Committed by Greg Kroah-Hartman
Browse files

usb: dwc3: Support EBC feature of DWC_usb31 



Support configuration and use of bulk endpoints in the so-called EBC
mode described in the DBC_usb31 databook (appendix E)

Added a bit fifo_mode to usb_ep to indicate to the UDC driver that a
specific endpoint is to operate in the EBC (or equivalent) mode when
enabled

Added macros for bits 15 and 14 of DEPCFG parameter 1 to indicate EBC
mode and write back behaviour. These bits will be set to 1 when
configuring an EBC endpoint as described in the programming guide

Signed-off-by: default avatarManan Aurora <maurora@google.com>
Link: https://lore.kernel.org/r/20231031034641.660606-1-maurora@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cd099cde

drivers/usb/dwc3/core.h

+1 −0
Original line number Diff line number Diff line
@@ -376,6 +376,7 @@ 
/* Global HWPARAMS4 Register */

#define DWC3_GHWPARAMS4_HIBER_SCRATCHBUFS(n)	(((n) & (0x0f << 13)) >> 13)

#define DWC3_MAX_HIBER_SCRATCHBUFS		15

#define DWC3_EXT_BUFF_CONTROL		BIT(21)



/* Global HWPARAMS6 Register */

#define DWC3_GHWPARAMS6_BCSUPPORT		BIT(14)

drivers/usb/dwc3/gadget.c

+6 −0
Original line number Diff line number Diff line
@@ -673,6 +673,12 @@ static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action) 
		params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(bInterval_m1);

	}



	if (dep->endpoint.fifo_mode) {

		if (!(dwc->hwparams.hwparams4 & DWC3_EXT_BUFF_CONTROL))

			return -EINVAL;

		params.param1 |= DWC3_DEPCFG_EBC_HWO_NOWB | DWC3_DEPCFG_USE_EBC;

	}



	return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, &params);

}

drivers/usb/dwc3/gadget.h

+2 −0
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ struct dwc3; 
#define DWC3_DEPCFG_XFER_NOT_READY_EN	BIT(10)

#define DWC3_DEPCFG_FIFO_ERROR_EN	BIT(11)

#define DWC3_DEPCFG_STREAM_EVENT_EN	BIT(13)

#define DWC3_DEPCFG_EBC_HWO_NOWB	BIT(14)

#define DWC3_DEPCFG_USE_EBC		BIT(15)

#define DWC3_DEPCFG_BINTERVAL_M1(n)	(((n) & 0xff) << 16)

#define DWC3_DEPCFG_STREAM_CAPABLE	BIT(24)

#define DWC3_DEPCFG_EP_NUMBER(n)	(((n) & 0x1f) << 25)

include/linux/usb/gadget.h

+1 −0
Original line number Diff line number Diff line
@@ -236,6 +236,7 @@ struct usb_ep { 
	unsigned		max_streams:16;

	unsigned		mult:2;

	unsigned		maxburst:5;

	unsigned		fifo_mode:1;

	u8			address;

	const struct usb_endpoint_descriptor	*desc;

	const struct usb_ss_ep_comp_descriptor	*comp_desc;