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d7ca7e1896
Instead of *always* calling dwc3_gadget_ep_get_transfer_index() after sending a Start Transfer command, we can call it once from dwc3_send_gadget_ep_cmd() itself. Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
3313 lines
81 KiB
C
3313 lines
81 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
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*
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* Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
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*
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* Authors: Felipe Balbi <balbi@ti.com>,
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* Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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*/
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/list.h>
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#include <linux/dma-mapping.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include "debug.h"
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#include "core.h"
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#include "gadget.h"
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#include "io.h"
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#define DWC3_ALIGN_FRAME(d) (((d)->frame_number + (d)->interval) \
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& ~((d)->interval - 1))
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/**
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* dwc3_gadget_set_test_mode - enables usb2 test modes
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* @dwc: pointer to our context structure
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* @mode: the mode to set (J, K SE0 NAK, Force Enable)
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*
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* Caller should take care of locking. This function will return 0 on
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* success or -EINVAL if wrong Test Selector is passed.
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*/
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int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
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{
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u32 reg;
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reg = dwc3_readl(dwc->regs, DWC3_DCTL);
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reg &= ~DWC3_DCTL_TSTCTRL_MASK;
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switch (mode) {
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case TEST_J:
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case TEST_K:
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case TEST_SE0_NAK:
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case TEST_PACKET:
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case TEST_FORCE_EN:
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reg |= mode << 1;
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break;
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default:
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return -EINVAL;
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}
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dwc3_writel(dwc->regs, DWC3_DCTL, reg);
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return 0;
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}
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/**
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* dwc3_gadget_get_link_state - gets current state of usb link
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* @dwc: pointer to our context structure
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*
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* Caller should take care of locking. This function will
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* return the link state on success (>= 0) or -ETIMEDOUT.
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*/
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int dwc3_gadget_get_link_state(struct dwc3 *dwc)
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{
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u32 reg;
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reg = dwc3_readl(dwc->regs, DWC3_DSTS);
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return DWC3_DSTS_USBLNKST(reg);
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}
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/**
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* dwc3_gadget_set_link_state - sets usb link to a particular state
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* @dwc: pointer to our context structure
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* @state: the state to put link into
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*
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* Caller should take care of locking. This function will
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* return 0 on success or -ETIMEDOUT.
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*/
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int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
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{
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int retries = 10000;
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u32 reg;
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/*
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* Wait until device controller is ready. Only applies to 1.94a and
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* later RTL.
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*/
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if (dwc->revision >= DWC3_REVISION_194A) {
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while (--retries) {
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reg = dwc3_readl(dwc->regs, DWC3_DSTS);
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if (reg & DWC3_DSTS_DCNRD)
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udelay(5);
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else
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break;
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}
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if (retries <= 0)
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return -ETIMEDOUT;
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}
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reg = dwc3_readl(dwc->regs, DWC3_DCTL);
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reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
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/* set requested state */
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reg |= DWC3_DCTL_ULSTCHNGREQ(state);
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dwc3_writel(dwc->regs, DWC3_DCTL, reg);
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/*
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* The following code is racy when called from dwc3_gadget_wakeup,
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* and is not needed, at least on newer versions
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*/
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if (dwc->revision >= DWC3_REVISION_194A)
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return 0;
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/* wait for a change in DSTS */
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retries = 10000;
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while (--retries) {
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reg = dwc3_readl(dwc->regs, DWC3_DSTS);
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if (DWC3_DSTS_USBLNKST(reg) == state)
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return 0;
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udelay(5);
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}
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return -ETIMEDOUT;
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}
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/**
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* dwc3_ep_inc_trb - increment a trb index.
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* @index: Pointer to the TRB index to increment.
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*
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* The index should never point to the link TRB. After incrementing,
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* if it is point to the link TRB, wrap around to the beginning. The
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* link TRB is always at the last TRB entry.
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*/
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static void dwc3_ep_inc_trb(u8 *index)
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{
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(*index)++;
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if (*index == (DWC3_TRB_NUM - 1))
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*index = 0;
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}
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/**
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* dwc3_ep_inc_enq - increment endpoint's enqueue pointer
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* @dep: The endpoint whose enqueue pointer we're incrementing
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*/
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static void dwc3_ep_inc_enq(struct dwc3_ep *dep)
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{
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dwc3_ep_inc_trb(&dep->trb_enqueue);
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}
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/**
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* dwc3_ep_inc_deq - increment endpoint's dequeue pointer
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* @dep: The endpoint whose enqueue pointer we're incrementing
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*/
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static void dwc3_ep_inc_deq(struct dwc3_ep *dep)
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{
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dwc3_ep_inc_trb(&dep->trb_dequeue);
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}
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void dwc3_gadget_del_and_unmap_request(struct dwc3_ep *dep,
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struct dwc3_request *req, int status)
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{
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struct dwc3 *dwc = dep->dwc;
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req->started = false;
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list_del(&req->list);
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req->remaining = 0;
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if (req->request.status == -EINPROGRESS)
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req->request.status = status;
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if (req->trb)
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usb_gadget_unmap_request_by_dev(dwc->sysdev,
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&req->request, req->direction);
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req->trb = NULL;
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trace_dwc3_gadget_giveback(req);
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if (dep->number > 1)
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pm_runtime_put(dwc->dev);
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}
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/**
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* dwc3_gadget_giveback - call struct usb_request's ->complete callback
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* @dep: The endpoint to whom the request belongs to
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* @req: The request we're giving back
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* @status: completion code for the request
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*
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* Must be called with controller's lock held and interrupts disabled. This
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* function will unmap @req and call its ->complete() callback to notify upper
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* layers that it has completed.
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*/
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void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
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int status)
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{
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struct dwc3 *dwc = dep->dwc;
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dwc3_gadget_del_and_unmap_request(dep, req, status);
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spin_unlock(&dwc->lock);
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usb_gadget_giveback_request(&dep->endpoint, &req->request);
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spin_lock(&dwc->lock);
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}
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/**
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* dwc3_send_gadget_generic_command - issue a generic command for the controller
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* @dwc: pointer to the controller context
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* @cmd: the command to be issued
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* @param: command parameter
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*
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* Caller should take care of locking. Issue @cmd with a given @param to @dwc
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* and wait for its completion.
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*/
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int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
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{
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u32 timeout = 500;
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int status = 0;
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int ret = 0;
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u32 reg;
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dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
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dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
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do {
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reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
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if (!(reg & DWC3_DGCMD_CMDACT)) {
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status = DWC3_DGCMD_STATUS(reg);
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if (status)
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ret = -EINVAL;
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break;
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}
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} while (--timeout);
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if (!timeout) {
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ret = -ETIMEDOUT;
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status = -ETIMEDOUT;
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}
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trace_dwc3_gadget_generic_cmd(cmd, param, status);
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return ret;
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}
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static int __dwc3_gadget_wakeup(struct dwc3 *dwc);
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/**
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* dwc3_send_gadget_ep_cmd - issue an endpoint command
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* @dep: the endpoint to which the command is going to be issued
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* @cmd: the command to be issued
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* @params: parameters to the command
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*
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* Caller should handle locking. This function will issue @cmd with given
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* @params to @dep and wait for its completion.
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*/
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int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
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struct dwc3_gadget_ep_cmd_params *params)
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{
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const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
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struct dwc3 *dwc = dep->dwc;
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u32 timeout = 1000;
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u32 reg;
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int cmd_status = 0;
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int susphy = false;
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int ret = -EINVAL;
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/*
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* Synopsys Databook 2.60a states, on section 6.3.2.5.[1-8], that if
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* we're issuing an endpoint command, we must check if
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* GUSB2PHYCFG.SUSPHY bit is set. If it is, then we need to clear it.
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*
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* We will also set SUSPHY bit to what it was before returning as stated
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* by the same section on Synopsys databook.
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*/
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if (dwc->gadget.speed <= USB_SPEED_HIGH) {
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reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
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if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {
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susphy = true;
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reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
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dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
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}
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}
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if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
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int needs_wakeup;
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needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 ||
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dwc->link_state == DWC3_LINK_STATE_U2 ||
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dwc->link_state == DWC3_LINK_STATE_U3);
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if (unlikely(needs_wakeup)) {
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ret = __dwc3_gadget_wakeup(dwc);
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dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n",
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ret);
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}
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}
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dwc3_writel(dep->regs, DWC3_DEPCMDPAR0, params->param0);
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dwc3_writel(dep->regs, DWC3_DEPCMDPAR1, params->param1);
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dwc3_writel(dep->regs, DWC3_DEPCMDPAR2, params->param2);
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/*
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* Synopsys Databook 2.60a states in section 6.3.2.5.6 of that if we're
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* not relying on XferNotReady, we can make use of a special "No
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* Response Update Transfer" command where we should clear both CmdAct
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* and CmdIOC bits.
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*
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* With this, we don't need to wait for command completion and can
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* straight away issue further commands to the endpoint.
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*
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* NOTICE: We're making an assumption that control endpoints will never
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* make use of Update Transfer command. This is a safe assumption
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* because we can never have more than one request at a time with
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* Control Endpoints. If anybody changes that assumption, this chunk
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* needs to be updated accordingly.
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*/
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if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_UPDATETRANSFER &&
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!usb_endpoint_xfer_isoc(desc))
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cmd &= ~(DWC3_DEPCMD_CMDIOC | DWC3_DEPCMD_CMDACT);
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else
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cmd |= DWC3_DEPCMD_CMDACT;
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dwc3_writel(dep->regs, DWC3_DEPCMD, cmd);
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do {
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reg = dwc3_readl(dep->regs, DWC3_DEPCMD);
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if (!(reg & DWC3_DEPCMD_CMDACT)) {
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cmd_status = DWC3_DEPCMD_STATUS(reg);
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switch (cmd_status) {
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case 0:
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ret = 0;
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break;
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case DEPEVT_TRANSFER_NO_RESOURCE:
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ret = -EINVAL;
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break;
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case DEPEVT_TRANSFER_BUS_EXPIRY:
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/*
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* SW issues START TRANSFER command to
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* isochronous ep with future frame interval. If
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* future interval time has already passed when
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* core receives the command, it will respond
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* with an error status of 'Bus Expiry'.
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*
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* Instead of always returning -EINVAL, let's
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* give a hint to the gadget driver that this is
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* the case by returning -EAGAIN.
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*/
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ret = -EAGAIN;
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break;
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default:
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dev_WARN(dwc->dev, "UNKNOWN cmd status\n");
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}
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break;
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}
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} while (--timeout);
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if (timeout == 0) {
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ret = -ETIMEDOUT;
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cmd_status = -ETIMEDOUT;
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}
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trace_dwc3_gadget_ep_cmd(dep, cmd, params, cmd_status);
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if (ret == 0) {
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switch (DWC3_DEPCMD_CMD(cmd)) {
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case DWC3_DEPCMD_STARTTRANSFER:
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dep->flags |= DWC3_EP_TRANSFER_STARTED;
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dwc3_gadget_ep_get_transfer_index(dep);
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break;
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case DWC3_DEPCMD_ENDTRANSFER:
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dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
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break;
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default:
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/* nothing */
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break;
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}
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}
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if (unlikely(susphy)) {
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reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
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reg |= DWC3_GUSB2PHYCFG_SUSPHY;
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dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
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}
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return ret;
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}
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static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
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{
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struct dwc3 *dwc = dep->dwc;
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struct dwc3_gadget_ep_cmd_params params;
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u32 cmd = DWC3_DEPCMD_CLEARSTALL;
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/*
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* As of core revision 2.60a the recommended programming model
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* is to set the ClearPendIN bit when issuing a Clear Stall EP
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* command for IN endpoints. This is to prevent an issue where
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* some (non-compliant) hosts may not send ACK TPs for pending
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* IN transfers due to a mishandled error condition. Synopsys
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* STAR 9000614252.
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*/
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if (dep->direction && (dwc->revision >= DWC3_REVISION_260A) &&
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(dwc->gadget.speed >= USB_SPEED_SUPER))
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cmd |= DWC3_DEPCMD_CLEARPENDIN;
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memset(¶ms, 0, sizeof(params));
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return dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
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}
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static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
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struct dwc3_trb *trb)
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{
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u32 offset = (char *) trb - (char *) dep->trb_pool;
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return dep->trb_pool_dma + offset;
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}
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static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
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{
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struct dwc3 *dwc = dep->dwc;
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if (dep->trb_pool)
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return 0;
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dep->trb_pool = dma_alloc_coherent(dwc->sysdev,
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sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
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&dep->trb_pool_dma, GFP_KERNEL);
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if (!dep->trb_pool) {
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dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
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dep->name);
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return -ENOMEM;
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}
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return 0;
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}
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static void dwc3_free_trb_pool(struct dwc3_ep *dep)
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{
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struct dwc3 *dwc = dep->dwc;
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dma_free_coherent(dwc->sysdev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
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dep->trb_pool, dep->trb_pool_dma);
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dep->trb_pool = NULL;
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dep->trb_pool_dma = 0;
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}
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static int dwc3_gadget_set_xfer_resource(struct dwc3_ep *dep)
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{
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struct dwc3_gadget_ep_cmd_params params;
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memset(¶ms, 0x00, sizeof(params));
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params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
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return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETTRANSFRESOURCE,
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¶ms);
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}
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/**
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* dwc3_gadget_start_config - configure ep resources
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* @dwc: pointer to our controller context structure
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* @dep: endpoint that is being enabled
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*
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* Issue a %DWC3_DEPCMD_DEPSTARTCFG command to @dep. After the command's
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* completion, it will set Transfer Resource for all available endpoints.
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*
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* The assignment of transfer resources cannot perfectly follow the data book
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* due to the fact that the controller driver does not have all knowledge of the
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* configuration in advance. It is given this information piecemeal by the
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* composite gadget framework after every SET_CONFIGURATION and
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* SET_INTERFACE. Trying to follow the databook programming model in this
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|
* scenario can cause errors. For two reasons:
|
|
*
|
|
* 1) The databook says to do %DWC3_DEPCMD_DEPSTARTCFG for every
|
|
* %USB_REQ_SET_CONFIGURATION and %USB_REQ_SET_INTERFACE (8.1.5). This is
|
|
* incorrect in the scenario of multiple interfaces.
|
|
*
|
|
* 2) The databook does not mention doing more %DWC3_DEPCMD_DEPXFERCFG for new
|
|
* endpoint on alt setting (8.1.6).
|
|
*
|
|
* The following simplified method is used instead:
|
|
*
|
|
* All hardware endpoints can be assigned a transfer resource and this setting
|
|
* will stay persistent until either a core reset or hibernation. So whenever we
|
|
* do a %DWC3_DEPCMD_DEPSTARTCFG(0) we can go ahead and do
|
|
* %DWC3_DEPCMD_DEPXFERCFG for every hardware endpoint as well. We are
|
|
* guaranteed that there are as many transfer resources as endpoints.
|
|
*
|
|
* This function is called for each endpoint when it is being enabled but is
|
|
* triggered only when called for EP0-out, which always happens first, and which
|
|
* should only happen in one of the above conditions.
|
|
*/
|
|
static int dwc3_gadget_start_config(struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3_gadget_ep_cmd_params params;
|
|
struct dwc3 *dwc;
|
|
u32 cmd;
|
|
int i;
|
|
int ret;
|
|
|
|
if (dep->number)
|
|
return 0;
|
|
|
|
memset(¶ms, 0x00, sizeof(params));
|
|
cmd = DWC3_DEPCMD_DEPSTARTCFG;
|
|
dwc = dep->dwc;
|
|
|
|
ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
|
|
struct dwc3_ep *dep = dwc->eps[i];
|
|
|
|
if (!dep)
|
|
continue;
|
|
|
|
ret = dwc3_gadget_set_xfer_resource(dep);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action)
|
|
{
|
|
const struct usb_ss_ep_comp_descriptor *comp_desc;
|
|
const struct usb_endpoint_descriptor *desc;
|
|
struct dwc3_gadget_ep_cmd_params params;
|
|
struct dwc3 *dwc = dep->dwc;
|
|
|
|
comp_desc = dep->endpoint.comp_desc;
|
|
desc = dep->endpoint.desc;
|
|
|
|
memset(¶ms, 0x00, sizeof(params));
|
|
|
|
params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
|
|
| DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
|
|
|
|
/* Burst size is only needed in SuperSpeed mode */
|
|
if (dwc->gadget.speed >= USB_SPEED_SUPER) {
|
|
u32 burst = dep->endpoint.maxburst;
|
|
params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst - 1);
|
|
}
|
|
|
|
params.param0 |= action;
|
|
if (action == DWC3_DEPCFG_ACTION_RESTORE)
|
|
params.param2 |= dep->saved_state;
|
|
|
|
if (usb_endpoint_xfer_control(desc))
|
|
params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN;
|
|
|
|
if (dep->number <= 1 || usb_endpoint_xfer_isoc(desc))
|
|
params.param1 |= DWC3_DEPCFG_XFER_NOT_READY_EN;
|
|
|
|
if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
|
|
params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
|
|
| DWC3_DEPCFG_STREAM_EVENT_EN;
|
|
dep->stream_capable = true;
|
|
}
|
|
|
|
if (!usb_endpoint_xfer_control(desc))
|
|
params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
|
|
|
|
/*
|
|
* We are doing 1:1 mapping for endpoints, meaning
|
|
* Physical Endpoints 2 maps to Logical Endpoint 2 and
|
|
* so on. We consider the direction bit as part of the physical
|
|
* endpoint number. So USB endpoint 0x81 is 0x03.
|
|
*/
|
|
params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
|
|
|
|
/*
|
|
* We must use the lower 16 TX FIFOs even though
|
|
* HW might have more
|
|
*/
|
|
if (dep->direction)
|
|
params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
|
|
|
|
if (desc->bInterval) {
|
|
params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
|
|
dep->interval = 1 << (desc->bInterval - 1);
|
|
}
|
|
|
|
return dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETEPCONFIG, ¶ms);
|
|
}
|
|
|
|
/**
|
|
* __dwc3_gadget_ep_enable - initializes a hw endpoint
|
|
* @dep: endpoint to be initialized
|
|
* @action: one of INIT, MODIFY or RESTORE
|
|
*
|
|
* Caller should take care of locking. Execute all necessary commands to
|
|
* initialize a HW endpoint so it can be used by a gadget driver.
|
|
*/
|
|
static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
|
|
{
|
|
const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
|
|
struct dwc3 *dwc = dep->dwc;
|
|
|
|
u32 reg;
|
|
int ret;
|
|
|
|
if (!(dep->flags & DWC3_EP_ENABLED)) {
|
|
ret = dwc3_gadget_start_config(dep);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = dwc3_gadget_set_ep_config(dep, action);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!(dep->flags & DWC3_EP_ENABLED)) {
|
|
struct dwc3_trb *trb_st_hw;
|
|
struct dwc3_trb *trb_link;
|
|
|
|
dep->type = usb_endpoint_type(desc);
|
|
dep->flags |= DWC3_EP_ENABLED;
|
|
dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
|
|
reg |= DWC3_DALEPENA_EP(dep->number);
|
|
dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
|
|
|
|
init_waitqueue_head(&dep->wait_end_transfer);
|
|
|
|
if (usb_endpoint_xfer_control(desc))
|
|
goto out;
|
|
|
|
/* Initialize the TRB ring */
|
|
dep->trb_dequeue = 0;
|
|
dep->trb_enqueue = 0;
|
|
memset(dep->trb_pool, 0,
|
|
sizeof(struct dwc3_trb) * DWC3_TRB_NUM);
|
|
|
|
/* Link TRB. The HWO bit is never reset */
|
|
trb_st_hw = &dep->trb_pool[0];
|
|
|
|
trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
|
|
trb_link->bpl = lower_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
|
|
trb_link->bph = upper_32_bits(dwc3_trb_dma_offset(dep, trb_st_hw));
|
|
trb_link->ctrl |= DWC3_TRBCTL_LINK_TRB;
|
|
trb_link->ctrl |= DWC3_TRB_CTRL_HWO;
|
|
}
|
|
|
|
/*
|
|
* Issue StartTransfer here with no-op TRB so we can always rely on No
|
|
* Response Update Transfer command.
|
|
*/
|
|
if (usb_endpoint_xfer_bulk(desc) ||
|
|
usb_endpoint_xfer_int(desc)) {
|
|
struct dwc3_gadget_ep_cmd_params params;
|
|
struct dwc3_trb *trb;
|
|
dma_addr_t trb_dma;
|
|
u32 cmd;
|
|
|
|
memset(¶ms, 0, sizeof(params));
|
|
trb = &dep->trb_pool[0];
|
|
trb_dma = dwc3_trb_dma_offset(dep, trb);
|
|
|
|
params.param0 = upper_32_bits(trb_dma);
|
|
params.param1 = lower_32_bits(trb_dma);
|
|
|
|
cmd = DWC3_DEPCMD_STARTTRANSFER;
|
|
|
|
ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
out:
|
|
trace_dwc3_gadget_ep_enable(dep);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force);
|
|
static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3_request *req;
|
|
|
|
dwc3_stop_active_transfer(dep, true);
|
|
|
|
/* - giveback all requests to gadget driver */
|
|
while (!list_empty(&dep->started_list)) {
|
|
req = next_request(&dep->started_list);
|
|
|
|
dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
|
|
}
|
|
|
|
while (!list_empty(&dep->pending_list)) {
|
|
req = next_request(&dep->pending_list);
|
|
|
|
dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* __dwc3_gadget_ep_disable - disables a hw endpoint
|
|
* @dep: the endpoint to disable
|
|
*
|
|
* This function undoes what __dwc3_gadget_ep_enable did and also removes
|
|
* requests which are currently being processed by the hardware and those which
|
|
* are not yet scheduled.
|
|
*
|
|
* Caller should take care of locking.
|
|
*/
|
|
static int __dwc3_gadget_ep_disable(struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
|
|
u32 reg;
|
|
|
|
trace_dwc3_gadget_ep_disable(dep);
|
|
|
|
dwc3_remove_requests(dwc, dep);
|
|
|
|
/* make sure HW endpoint isn't stalled */
|
|
if (dep->flags & DWC3_EP_STALL)
|
|
__dwc3_gadget_ep_set_halt(dep, 0, false);
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
|
|
reg &= ~DWC3_DALEPENA_EP(dep->number);
|
|
dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
|
|
|
|
dep->stream_capable = false;
|
|
dep->type = 0;
|
|
dep->flags &= DWC3_EP_END_TRANSFER_PENDING;
|
|
|
|
/* Clear out the ep descriptors for non-ep0 */
|
|
if (dep->number > 1) {
|
|
dep->endpoint.comp_desc = NULL;
|
|
dep->endpoint.desc = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
static int dwc3_gadget_ep0_enable(struct usb_ep *ep,
|
|
const struct usb_endpoint_descriptor *desc)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int dwc3_gadget_ep0_disable(struct usb_ep *ep)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
static int dwc3_gadget_ep_enable(struct usb_ep *ep,
|
|
const struct usb_endpoint_descriptor *desc)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
struct dwc3 *dwc;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
|
|
pr_debug("dwc3: invalid parameters\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!desc->wMaxPacketSize) {
|
|
pr_debug("dwc3: missing wMaxPacketSize\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dep = to_dwc3_ep(ep);
|
|
dwc = dep->dwc;
|
|
|
|
if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
|
|
"%s is already enabled\n",
|
|
dep->name))
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dwc3_gadget_ep_disable(struct usb_ep *ep)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
struct dwc3 *dwc;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
if (!ep) {
|
|
pr_debug("dwc3: invalid parameters\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dep = to_dwc3_ep(ep);
|
|
dwc = dep->dwc;
|
|
|
|
if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
|
|
"%s is already disabled\n",
|
|
dep->name))
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
ret = __dwc3_gadget_ep_disable(dep);
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct usb_request *dwc3_gadget_ep_alloc_request(struct usb_ep *ep,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct dwc3_request *req;
|
|
struct dwc3_ep *dep = to_dwc3_ep(ep);
|
|
|
|
req = kzalloc(sizeof(*req), gfp_flags);
|
|
if (!req)
|
|
return NULL;
|
|
|
|
req->epnum = dep->number;
|
|
req->dep = dep;
|
|
|
|
trace_dwc3_alloc_request(req);
|
|
|
|
return &req->request;
|
|
}
|
|
|
|
static void dwc3_gadget_ep_free_request(struct usb_ep *ep,
|
|
struct usb_request *request)
|
|
{
|
|
struct dwc3_request *req = to_dwc3_request(request);
|
|
|
|
trace_dwc3_free_request(req);
|
|
kfree(req);
|
|
}
|
|
|
|
/**
|
|
* dwc3_ep_prev_trb - returns the previous TRB in the ring
|
|
* @dep: The endpoint with the TRB ring
|
|
* @index: The index of the current TRB in the ring
|
|
*
|
|
* Returns the TRB prior to the one pointed to by the index. If the
|
|
* index is 0, we will wrap backwards, skip the link TRB, and return
|
|
* the one just before that.
|
|
*/
|
|
static struct dwc3_trb *dwc3_ep_prev_trb(struct dwc3_ep *dep, u8 index)
|
|
{
|
|
u8 tmp = index;
|
|
|
|
if (!tmp)
|
|
tmp = DWC3_TRB_NUM - 1;
|
|
|
|
return &dep->trb_pool[tmp - 1];
|
|
}
|
|
|
|
static u32 dwc3_calc_trbs_left(struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3_trb *tmp;
|
|
u8 trbs_left;
|
|
|
|
/*
|
|
* If enqueue & dequeue are equal than it is either full or empty.
|
|
*
|
|
* One way to know for sure is if the TRB right before us has HWO bit
|
|
* set or not. If it has, then we're definitely full and can't fit any
|
|
* more transfers in our ring.
|
|
*/
|
|
if (dep->trb_enqueue == dep->trb_dequeue) {
|
|
tmp = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
|
|
if (tmp->ctrl & DWC3_TRB_CTRL_HWO)
|
|
return 0;
|
|
|
|
return DWC3_TRB_NUM - 1;
|
|
}
|
|
|
|
trbs_left = dep->trb_dequeue - dep->trb_enqueue;
|
|
trbs_left &= (DWC3_TRB_NUM - 1);
|
|
|
|
if (dep->trb_dequeue < dep->trb_enqueue)
|
|
trbs_left--;
|
|
|
|
return trbs_left;
|
|
}
|
|
|
|
static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_trb *trb,
|
|
dma_addr_t dma, unsigned length, unsigned chain, unsigned node,
|
|
unsigned stream_id, unsigned short_not_ok, unsigned no_interrupt)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
|
|
struct usb_gadget *gadget = &dwc->gadget;
|
|
enum usb_device_speed speed = gadget->speed;
|
|
|
|
dwc3_ep_inc_enq(dep);
|
|
|
|
trb->size = DWC3_TRB_SIZE_LENGTH(length);
|
|
trb->bpl = lower_32_bits(dma);
|
|
trb->bph = upper_32_bits(dma);
|
|
|
|
switch (usb_endpoint_type(dep->endpoint.desc)) {
|
|
case USB_ENDPOINT_XFER_CONTROL:
|
|
trb->ctrl = DWC3_TRBCTL_CONTROL_SETUP;
|
|
break;
|
|
|
|
case USB_ENDPOINT_XFER_ISOC:
|
|
if (!node) {
|
|
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
|
|
|
|
/*
|
|
* USB Specification 2.0 Section 5.9.2 states that: "If
|
|
* there is only a single transaction in the microframe,
|
|
* only a DATA0 data packet PID is used. If there are
|
|
* two transactions per microframe, DATA1 is used for
|
|
* the first transaction data packet and DATA0 is used
|
|
* for the second transaction data packet. If there are
|
|
* three transactions per microframe, DATA2 is used for
|
|
* the first transaction data packet, DATA1 is used for
|
|
* the second, and DATA0 is used for the third."
|
|
*
|
|
* IOW, we should satisfy the following cases:
|
|
*
|
|
* 1) length <= maxpacket
|
|
* - DATA0
|
|
*
|
|
* 2) maxpacket < length <= (2 * maxpacket)
|
|
* - DATA1, DATA0
|
|
*
|
|
* 3) (2 * maxpacket) < length <= (3 * maxpacket)
|
|
* - DATA2, DATA1, DATA0
|
|
*/
|
|
if (speed == USB_SPEED_HIGH) {
|
|
struct usb_ep *ep = &dep->endpoint;
|
|
unsigned int mult = 2;
|
|
unsigned int maxp = usb_endpoint_maxp(ep->desc);
|
|
|
|
if (length <= (2 * maxp))
|
|
mult--;
|
|
|
|
if (length <= maxp)
|
|
mult--;
|
|
|
|
trb->size |= DWC3_TRB_SIZE_PCM1(mult);
|
|
}
|
|
} else {
|
|
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
|
|
}
|
|
|
|
/* always enable Interrupt on Missed ISOC */
|
|
trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
|
|
break;
|
|
|
|
case USB_ENDPOINT_XFER_BULK:
|
|
case USB_ENDPOINT_XFER_INT:
|
|
trb->ctrl = DWC3_TRBCTL_NORMAL;
|
|
break;
|
|
default:
|
|
/*
|
|
* This is only possible with faulty memory because we
|
|
* checked it already :)
|
|
*/
|
|
dev_WARN(dwc->dev, "Unknown endpoint type %d\n",
|
|
usb_endpoint_type(dep->endpoint.desc));
|
|
}
|
|
|
|
/* always enable Continue on Short Packet */
|
|
if (usb_endpoint_dir_out(dep->endpoint.desc)) {
|
|
trb->ctrl |= DWC3_TRB_CTRL_CSP;
|
|
|
|
if (short_not_ok)
|
|
trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
|
|
}
|
|
|
|
if ((!no_interrupt && !chain) ||
|
|
(dwc3_calc_trbs_left(dep) == 0))
|
|
trb->ctrl |= DWC3_TRB_CTRL_IOC;
|
|
|
|
if (chain)
|
|
trb->ctrl |= DWC3_TRB_CTRL_CHN;
|
|
|
|
if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
|
|
trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(stream_id);
|
|
|
|
trb->ctrl |= DWC3_TRB_CTRL_HWO;
|
|
|
|
trace_dwc3_prepare_trb(dep, trb);
|
|
}
|
|
|
|
/**
|
|
* dwc3_prepare_one_trb - setup one TRB from one request
|
|
* @dep: endpoint for which this request is prepared
|
|
* @req: dwc3_request pointer
|
|
* @chain: should this TRB be chained to the next?
|
|
* @node: only for isochronous endpoints. First TRB needs different type.
|
|
*/
|
|
static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
|
|
struct dwc3_request *req, unsigned chain, unsigned node)
|
|
{
|
|
struct dwc3_trb *trb;
|
|
unsigned int length;
|
|
dma_addr_t dma;
|
|
unsigned stream_id = req->request.stream_id;
|
|
unsigned short_not_ok = req->request.short_not_ok;
|
|
unsigned no_interrupt = req->request.no_interrupt;
|
|
|
|
if (req->request.num_sgs > 0) {
|
|
length = sg_dma_len(req->start_sg);
|
|
dma = sg_dma_address(req->start_sg);
|
|
} else {
|
|
length = req->request.length;
|
|
dma = req->request.dma;
|
|
}
|
|
|
|
trb = &dep->trb_pool[dep->trb_enqueue];
|
|
|
|
if (!req->trb) {
|
|
dwc3_gadget_move_started_request(req);
|
|
req->trb = trb;
|
|
req->trb_dma = dwc3_trb_dma_offset(dep, trb);
|
|
}
|
|
|
|
__dwc3_prepare_one_trb(dep, trb, dma, length, chain, node,
|
|
stream_id, short_not_ok, no_interrupt);
|
|
}
|
|
|
|
static void dwc3_prepare_one_trb_sg(struct dwc3_ep *dep,
|
|
struct dwc3_request *req)
|
|
{
|
|
struct scatterlist *sg = req->start_sg;
|
|
struct scatterlist *s;
|
|
int i;
|
|
|
|
unsigned int remaining = req->request.num_mapped_sgs
|
|
- req->num_queued_sgs;
|
|
|
|
for_each_sg(sg, s, remaining, i) {
|
|
unsigned int length = req->request.length;
|
|
unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
|
|
unsigned int rem = length % maxp;
|
|
unsigned chain = true;
|
|
|
|
if (sg_is_last(s))
|
|
chain = false;
|
|
|
|
if (rem && usb_endpoint_dir_out(dep->endpoint.desc) && !chain) {
|
|
struct dwc3 *dwc = dep->dwc;
|
|
struct dwc3_trb *trb;
|
|
|
|
req->unaligned = true;
|
|
|
|
/* prepare normal TRB */
|
|
dwc3_prepare_one_trb(dep, req, true, i);
|
|
|
|
/* Now prepare one extra TRB to align transfer size */
|
|
trb = &dep->trb_pool[dep->trb_enqueue];
|
|
__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr,
|
|
maxp - rem, false, 0,
|
|
req->request.stream_id,
|
|
req->request.short_not_ok,
|
|
req->request.no_interrupt);
|
|
} else {
|
|
dwc3_prepare_one_trb(dep, req, chain, i);
|
|
}
|
|
|
|
/*
|
|
* There can be a situation where all sgs in sglist are not
|
|
* queued because of insufficient trb number. To handle this
|
|
* case, update start_sg to next sg to be queued, so that
|
|
* we have free trbs we can continue queuing from where we
|
|
* previously stopped
|
|
*/
|
|
if (chain)
|
|
req->start_sg = sg_next(s);
|
|
|
|
req->num_queued_sgs++;
|
|
|
|
if (!dwc3_calc_trbs_left(dep))
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dwc3_prepare_one_trb_linear(struct dwc3_ep *dep,
|
|
struct dwc3_request *req)
|
|
{
|
|
unsigned int length = req->request.length;
|
|
unsigned int maxp = usb_endpoint_maxp(dep->endpoint.desc);
|
|
unsigned int rem = length % maxp;
|
|
|
|
if (rem && usb_endpoint_dir_out(dep->endpoint.desc)) {
|
|
struct dwc3 *dwc = dep->dwc;
|
|
struct dwc3_trb *trb;
|
|
|
|
req->unaligned = true;
|
|
|
|
/* prepare normal TRB */
|
|
dwc3_prepare_one_trb(dep, req, true, 0);
|
|
|
|
/* Now prepare one extra TRB to align transfer size */
|
|
trb = &dep->trb_pool[dep->trb_enqueue];
|
|
__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, maxp - rem,
|
|
false, 0, req->request.stream_id,
|
|
req->request.short_not_ok,
|
|
req->request.no_interrupt);
|
|
} else if (req->request.zero && req->request.length &&
|
|
(IS_ALIGNED(req->request.length,dep->endpoint.maxpacket))) {
|
|
struct dwc3 *dwc = dep->dwc;
|
|
struct dwc3_trb *trb;
|
|
|
|
req->zero = true;
|
|
|
|
/* prepare normal TRB */
|
|
dwc3_prepare_one_trb(dep, req, true, 0);
|
|
|
|
/* Now prepare one extra TRB to handle ZLP */
|
|
trb = &dep->trb_pool[dep->trb_enqueue];
|
|
__dwc3_prepare_one_trb(dep, trb, dwc->bounce_addr, 0,
|
|
false, 0, req->request.stream_id,
|
|
req->request.short_not_ok,
|
|
req->request.no_interrupt);
|
|
} else {
|
|
dwc3_prepare_one_trb(dep, req, false, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* dwc3_prepare_trbs - setup TRBs from requests
|
|
* @dep: endpoint for which requests are being prepared
|
|
*
|
|
* The function goes through the requests list and sets up TRBs for the
|
|
* transfers. The function returns once there are no more TRBs available or
|
|
* it runs out of requests.
|
|
*/
|
|
static void dwc3_prepare_trbs(struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3_request *req, *n;
|
|
|
|
BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
|
|
|
|
/*
|
|
* We can get in a situation where there's a request in the started list
|
|
* but there weren't enough TRBs to fully kick it in the first time
|
|
* around, so it has been waiting for more TRBs to be freed up.
|
|
*
|
|
* In that case, we should check if we have a request with pending_sgs
|
|
* in the started list and prepare TRBs for that request first,
|
|
* otherwise we will prepare TRBs completely out of order and that will
|
|
* break things.
|
|
*/
|
|
list_for_each_entry(req, &dep->started_list, list) {
|
|
if (req->num_pending_sgs > 0)
|
|
dwc3_prepare_one_trb_sg(dep, req);
|
|
|
|
if (!dwc3_calc_trbs_left(dep))
|
|
return;
|
|
}
|
|
|
|
list_for_each_entry_safe(req, n, &dep->pending_list, list) {
|
|
struct dwc3 *dwc = dep->dwc;
|
|
int ret;
|
|
|
|
ret = usb_gadget_map_request_by_dev(dwc->sysdev, &req->request,
|
|
dep->direction);
|
|
if (ret)
|
|
return;
|
|
|
|
req->sg = req->request.sg;
|
|
req->start_sg = req->sg;
|
|
req->num_queued_sgs = 0;
|
|
req->num_pending_sgs = req->request.num_mapped_sgs;
|
|
|
|
if (req->num_pending_sgs > 0)
|
|
dwc3_prepare_one_trb_sg(dep, req);
|
|
else
|
|
dwc3_prepare_one_trb_linear(dep, req);
|
|
|
|
if (!dwc3_calc_trbs_left(dep))
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3_gadget_ep_cmd_params params;
|
|
struct dwc3_request *req;
|
|
int starting;
|
|
int ret;
|
|
u32 cmd;
|
|
|
|
if (!dwc3_calc_trbs_left(dep))
|
|
return 0;
|
|
|
|
starting = !(dep->flags & DWC3_EP_TRANSFER_STARTED);
|
|
|
|
dwc3_prepare_trbs(dep);
|
|
req = next_request(&dep->started_list);
|
|
if (!req) {
|
|
dep->flags |= DWC3_EP_PENDING_REQUEST;
|
|
return 0;
|
|
}
|
|
|
|
memset(¶ms, 0, sizeof(params));
|
|
|
|
if (starting) {
|
|
params.param0 = upper_32_bits(req->trb_dma);
|
|
params.param1 = lower_32_bits(req->trb_dma);
|
|
cmd = DWC3_DEPCMD_STARTTRANSFER;
|
|
|
|
if (usb_endpoint_xfer_isoc(dep->endpoint.desc))
|
|
cmd |= DWC3_DEPCMD_PARAM(dep->frame_number);
|
|
} else {
|
|
cmd = DWC3_DEPCMD_UPDATETRANSFER |
|
|
DWC3_DEPCMD_PARAM(dep->resource_index);
|
|
}
|
|
|
|
ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
|
|
if (ret < 0) {
|
|
/*
|
|
* FIXME we need to iterate over the list of requests
|
|
* here and stop, unmap, free and del each of the linked
|
|
* requests instead of what we do now.
|
|
*/
|
|
if (req->trb)
|
|
memset(req->trb, 0, sizeof(struct dwc3_trb));
|
|
dwc3_gadget_del_and_unmap_request(dep, req, ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __dwc3_gadget_get_frame(struct dwc3 *dwc)
|
|
{
|
|
u32 reg;
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
|
|
return DWC3_DSTS_SOFFN(reg);
|
|
}
|
|
|
|
static void __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
|
|
{
|
|
if (list_empty(&dep->pending_list)) {
|
|
dev_info(dep->dwc->dev, "%s: ran out of requests\n",
|
|
dep->name);
|
|
dep->flags |= DWC3_EP_PENDING_REQUEST;
|
|
return;
|
|
}
|
|
|
|
dep->frame_number = DWC3_ALIGN_FRAME(dep);
|
|
__dwc3_gadget_kick_transfer(dep);
|
|
}
|
|
|
|
static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
|
|
|
|
if (!dep->endpoint.desc) {
|
|
dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
|
|
dep->name);
|
|
return -ESHUTDOWN;
|
|
}
|
|
|
|
if (WARN(req->dep != dep, "request %pK belongs to '%s'\n",
|
|
&req->request, req->dep->name))
|
|
return -EINVAL;
|
|
|
|
pm_runtime_get(dwc->dev);
|
|
|
|
req->request.actual = 0;
|
|
req->request.status = -EINPROGRESS;
|
|
req->direction = dep->direction;
|
|
req->epnum = dep->number;
|
|
|
|
trace_dwc3_ep_queue(req);
|
|
|
|
list_add_tail(&req->list, &dep->pending_list);
|
|
|
|
/*
|
|
* NOTICE: Isochronous endpoints should NEVER be prestarted. We must
|
|
* wait for a XferNotReady event so we will know what's the current
|
|
* (micro-)frame number.
|
|
*
|
|
* Without this trick, we are very, very likely gonna get Bus Expiry
|
|
* errors which will force us issue EndTransfer command.
|
|
*/
|
|
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
|
|
if (!(dep->flags & DWC3_EP_PENDING_REQUEST) &&
|
|
!(dep->flags & DWC3_EP_TRANSFER_STARTED))
|
|
return 0;
|
|
|
|
if ((dep->flags & DWC3_EP_PENDING_REQUEST)) {
|
|
if (!(dep->flags & DWC3_EP_TRANSFER_STARTED)) {
|
|
__dwc3_gadget_start_isoc(dep);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return __dwc3_gadget_kick_transfer(dep);
|
|
}
|
|
|
|
static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct dwc3_request *req = to_dwc3_request(request);
|
|
struct dwc3_ep *dep = to_dwc3_ep(ep);
|
|
struct dwc3 *dwc = dep->dwc;
|
|
|
|
unsigned long flags;
|
|
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
ret = __dwc3_gadget_ep_queue(dep, req);
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
|
|
struct usb_request *request)
|
|
{
|
|
struct dwc3_request *req = to_dwc3_request(request);
|
|
struct dwc3_request *r = NULL;
|
|
|
|
struct dwc3_ep *dep = to_dwc3_ep(ep);
|
|
struct dwc3 *dwc = dep->dwc;
|
|
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
trace_dwc3_ep_dequeue(req);
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
|
|
list_for_each_entry(r, &dep->pending_list, list) {
|
|
if (r == req)
|
|
break;
|
|
}
|
|
|
|
if (r != req) {
|
|
list_for_each_entry(r, &dep->started_list, list) {
|
|
if (r == req)
|
|
break;
|
|
}
|
|
if (r == req) {
|
|
/* wait until it is processed */
|
|
dwc3_stop_active_transfer(dep, true);
|
|
|
|
/*
|
|
* If request was already started, this means we had to
|
|
* stop the transfer. With that we also need to ignore
|
|
* all TRBs used by the request, however TRBs can only
|
|
* be modified after completion of END_TRANSFER
|
|
* command. So what we do here is that we wait for
|
|
* END_TRANSFER completion and only after that, we jump
|
|
* over TRBs by clearing HWO and incrementing dequeue
|
|
* pointer.
|
|
*
|
|
* Note that we have 2 possible types of transfers here:
|
|
*
|
|
* i) Linear buffer request
|
|
* ii) SG-list based request
|
|
*
|
|
* SG-list based requests will have r->num_pending_sgs
|
|
* set to a valid number (> 0). Linear requests,
|
|
* normally use a single TRB.
|
|
*
|
|
* For each of these two cases, if r->unaligned flag is
|
|
* set, one extra TRB has been used to align transfer
|
|
* size to wMaxPacketSize.
|
|
*
|
|
* All of these cases need to be taken into
|
|
* consideration so we don't mess up our TRB ring
|
|
* pointers.
|
|
*/
|
|
wait_event_lock_irq(dep->wait_end_transfer,
|
|
!(dep->flags & DWC3_EP_END_TRANSFER_PENDING),
|
|
dwc->lock);
|
|
|
|
if (!r->trb)
|
|
goto out1;
|
|
|
|
if (r->num_pending_sgs) {
|
|
struct dwc3_trb *trb;
|
|
int i = 0;
|
|
|
|
for (i = 0; i < r->num_pending_sgs; i++) {
|
|
trb = r->trb + i;
|
|
trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
|
|
dwc3_ep_inc_deq(dep);
|
|
}
|
|
|
|
if (r->unaligned || r->zero) {
|
|
trb = r->trb + r->num_pending_sgs + 1;
|
|
trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
|
|
dwc3_ep_inc_deq(dep);
|
|
}
|
|
} else {
|
|
struct dwc3_trb *trb = r->trb;
|
|
|
|
trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
|
|
dwc3_ep_inc_deq(dep);
|
|
|
|
if (r->unaligned || r->zero) {
|
|
trb = r->trb + 1;
|
|
trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
|
|
dwc3_ep_inc_deq(dep);
|
|
}
|
|
}
|
|
goto out1;
|
|
}
|
|
dev_err(dwc->dev, "request %pK was not queued to %s\n",
|
|
request, ep->name);
|
|
ret = -EINVAL;
|
|
goto out0;
|
|
}
|
|
|
|
out1:
|
|
/* giveback the request */
|
|
|
|
dwc3_gadget_giveback(dep, req, -ECONNRESET);
|
|
|
|
out0:
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
|
|
{
|
|
struct dwc3_gadget_ep_cmd_params params;
|
|
struct dwc3 *dwc = dep->dwc;
|
|
int ret;
|
|
|
|
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
|
|
dev_err(dwc->dev, "%s is of Isochronous type\n", dep->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
memset(¶ms, 0x00, sizeof(params));
|
|
|
|
if (value) {
|
|
struct dwc3_trb *trb;
|
|
|
|
unsigned transfer_in_flight;
|
|
unsigned started;
|
|
|
|
if (dep->flags & DWC3_EP_STALL)
|
|
return 0;
|
|
|
|
if (dep->number > 1)
|
|
trb = dwc3_ep_prev_trb(dep, dep->trb_enqueue);
|
|
else
|
|
trb = &dwc->ep0_trb[dep->trb_enqueue];
|
|
|
|
transfer_in_flight = trb->ctrl & DWC3_TRB_CTRL_HWO;
|
|
started = !list_empty(&dep->started_list);
|
|
|
|
if (!protocol && ((dep->direction && transfer_in_flight) ||
|
|
(!dep->direction && started))) {
|
|
return -EAGAIN;
|
|
}
|
|
|
|
ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_SETSTALL,
|
|
¶ms);
|
|
if (ret)
|
|
dev_err(dwc->dev, "failed to set STALL on %s\n",
|
|
dep->name);
|
|
else
|
|
dep->flags |= DWC3_EP_STALL;
|
|
} else {
|
|
if (!(dep->flags & DWC3_EP_STALL))
|
|
return 0;
|
|
|
|
ret = dwc3_send_clear_stall_ep_cmd(dep);
|
|
if (ret)
|
|
dev_err(dwc->dev, "failed to clear STALL on %s\n",
|
|
dep->name);
|
|
else
|
|
dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dwc3_gadget_ep_set_halt(struct usb_ep *ep, int value)
|
|
{
|
|
struct dwc3_ep *dep = to_dwc3_ep(ep);
|
|
struct dwc3 *dwc = dep->dwc;
|
|
|
|
unsigned long flags;
|
|
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
ret = __dwc3_gadget_ep_set_halt(dep, value, false);
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dwc3_gadget_ep_set_wedge(struct usb_ep *ep)
|
|
{
|
|
struct dwc3_ep *dep = to_dwc3_ep(ep);
|
|
struct dwc3 *dwc = dep->dwc;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
dep->flags |= DWC3_EP_WEDGE;
|
|
|
|
if (dep->number == 0 || dep->number == 1)
|
|
ret = __dwc3_gadget_ep0_set_halt(ep, 1);
|
|
else
|
|
ret = __dwc3_gadget_ep_set_halt(dep, 1, false);
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
static struct usb_endpoint_descriptor dwc3_gadget_ep0_desc = {
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
|
|
};
|
|
|
|
static const struct usb_ep_ops dwc3_gadget_ep0_ops = {
|
|
.enable = dwc3_gadget_ep0_enable,
|
|
.disable = dwc3_gadget_ep0_disable,
|
|
.alloc_request = dwc3_gadget_ep_alloc_request,
|
|
.free_request = dwc3_gadget_ep_free_request,
|
|
.queue = dwc3_gadget_ep0_queue,
|
|
.dequeue = dwc3_gadget_ep_dequeue,
|
|
.set_halt = dwc3_gadget_ep0_set_halt,
|
|
.set_wedge = dwc3_gadget_ep_set_wedge,
|
|
};
|
|
|
|
static const struct usb_ep_ops dwc3_gadget_ep_ops = {
|
|
.enable = dwc3_gadget_ep_enable,
|
|
.disable = dwc3_gadget_ep_disable,
|
|
.alloc_request = dwc3_gadget_ep_alloc_request,
|
|
.free_request = dwc3_gadget_ep_free_request,
|
|
.queue = dwc3_gadget_ep_queue,
|
|
.dequeue = dwc3_gadget_ep_dequeue,
|
|
.set_halt = dwc3_gadget_ep_set_halt,
|
|
.set_wedge = dwc3_gadget_ep_set_wedge,
|
|
};
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
static int dwc3_gadget_get_frame(struct usb_gadget *g)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
|
|
return __dwc3_gadget_get_frame(dwc);
|
|
}
|
|
|
|
static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
|
|
{
|
|
int retries;
|
|
|
|
int ret;
|
|
u32 reg;
|
|
|
|
u8 link_state;
|
|
u8 speed;
|
|
|
|
/*
|
|
* According to the Databook Remote wakeup request should
|
|
* be issued only when the device is in early suspend state.
|
|
*
|
|
* We can check that via USB Link State bits in DSTS register.
|
|
*/
|
|
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
|
|
|
|
speed = reg & DWC3_DSTS_CONNECTSPD;
|
|
if ((speed == DWC3_DSTS_SUPERSPEED) ||
|
|
(speed == DWC3_DSTS_SUPERSPEED_PLUS))
|
|
return 0;
|
|
|
|
link_state = DWC3_DSTS_USBLNKST(reg);
|
|
|
|
switch (link_state) {
|
|
case DWC3_LINK_STATE_RX_DET: /* in HS, means Early Suspend */
|
|
case DWC3_LINK_STATE_U3: /* in HS, means SUSPEND */
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RECOV);
|
|
if (ret < 0) {
|
|
dev_err(dwc->dev, "failed to put link in Recovery\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Recent versions do this automatically */
|
|
if (dwc->revision < DWC3_REVISION_194A) {
|
|
/* write zeroes to Link Change Request */
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
|
|
reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
|
|
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
|
|
}
|
|
|
|
/* poll until Link State changes to ON */
|
|
retries = 20000;
|
|
|
|
while (retries--) {
|
|
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
|
|
|
|
/* in HS, means ON */
|
|
if (DWC3_DSTS_USBLNKST(reg) == DWC3_LINK_STATE_U0)
|
|
break;
|
|
}
|
|
|
|
if (DWC3_DSTS_USBLNKST(reg) != DWC3_LINK_STATE_U0) {
|
|
dev_err(dwc->dev, "failed to send remote wakeup\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dwc3_gadget_wakeup(struct usb_gadget *g)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
ret = __dwc3_gadget_wakeup(dwc);
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dwc3_gadget_set_selfpowered(struct usb_gadget *g,
|
|
int is_selfpowered)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
g->is_selfpowered = !!is_selfpowered;
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
|
|
{
|
|
u32 reg;
|
|
u32 timeout = 500;
|
|
|
|
if (pm_runtime_suspended(dwc->dev))
|
|
return 0;
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
|
|
if (is_on) {
|
|
if (dwc->revision <= DWC3_REVISION_187A) {
|
|
reg &= ~DWC3_DCTL_TRGTULST_MASK;
|
|
reg |= DWC3_DCTL_TRGTULST_RX_DET;
|
|
}
|
|
|
|
if (dwc->revision >= DWC3_REVISION_194A)
|
|
reg &= ~DWC3_DCTL_KEEP_CONNECT;
|
|
reg |= DWC3_DCTL_RUN_STOP;
|
|
|
|
if (dwc->has_hibernation)
|
|
reg |= DWC3_DCTL_KEEP_CONNECT;
|
|
|
|
dwc->pullups_connected = true;
|
|
} else {
|
|
reg &= ~DWC3_DCTL_RUN_STOP;
|
|
|
|
if (dwc->has_hibernation && !suspend)
|
|
reg &= ~DWC3_DCTL_KEEP_CONNECT;
|
|
|
|
dwc->pullups_connected = false;
|
|
}
|
|
|
|
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
|
|
|
|
do {
|
|
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
|
|
reg &= DWC3_DSTS_DEVCTRLHLT;
|
|
} while (--timeout && !(!is_on ^ !reg));
|
|
|
|
if (!timeout)
|
|
return -ETIMEDOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
is_on = !!is_on;
|
|
|
|
/*
|
|
* Per databook, when we want to stop the gadget, if a control transfer
|
|
* is still in process, complete it and get the core into setup phase.
|
|
*/
|
|
if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) {
|
|
reinit_completion(&dwc->ep0_in_setup);
|
|
|
|
ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
|
|
msecs_to_jiffies(DWC3_PULL_UP_TIMEOUT));
|
|
if (ret == 0) {
|
|
dev_err(dwc->dev, "timed out waiting for SETUP phase\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
}
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
ret = dwc3_gadget_run_stop(dwc, is_on, false);
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void dwc3_gadget_enable_irq(struct dwc3 *dwc)
|
|
{
|
|
u32 reg;
|
|
|
|
/* Enable all but Start and End of Frame IRQs */
|
|
reg = (DWC3_DEVTEN_VNDRDEVTSTRCVEDEN |
|
|
DWC3_DEVTEN_EVNTOVERFLOWEN |
|
|
DWC3_DEVTEN_CMDCMPLTEN |
|
|
DWC3_DEVTEN_ERRTICERREN |
|
|
DWC3_DEVTEN_WKUPEVTEN |
|
|
DWC3_DEVTEN_CONNECTDONEEN |
|
|
DWC3_DEVTEN_USBRSTEN |
|
|
DWC3_DEVTEN_DISCONNEVTEN);
|
|
|
|
if (dwc->revision < DWC3_REVISION_250A)
|
|
reg |= DWC3_DEVTEN_ULSTCNGEN;
|
|
|
|
dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
|
|
}
|
|
|
|
static void dwc3_gadget_disable_irq(struct dwc3 *dwc)
|
|
{
|
|
/* mask all interrupts */
|
|
dwc3_writel(dwc->regs, DWC3_DEVTEN, 0x00);
|
|
}
|
|
|
|
static irqreturn_t dwc3_interrupt(int irq, void *_dwc);
|
|
static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc);
|
|
|
|
/**
|
|
* dwc3_gadget_setup_nump - calculate and initialize NUMP field of %DWC3_DCFG
|
|
* @dwc: pointer to our context structure
|
|
*
|
|
* The following looks like complex but it's actually very simple. In order to
|
|
* calculate the number of packets we can burst at once on OUT transfers, we're
|
|
* gonna use RxFIFO size.
|
|
*
|
|
* To calculate RxFIFO size we need two numbers:
|
|
* MDWIDTH = size, in bits, of the internal memory bus
|
|
* RAM2_DEPTH = depth, in MDWIDTH, of internal RAM2 (where RxFIFO sits)
|
|
*
|
|
* Given these two numbers, the formula is simple:
|
|
*
|
|
* RxFIFO Size = (RAM2_DEPTH * MDWIDTH / 8) - 24 - 16;
|
|
*
|
|
* 24 bytes is for 3x SETUP packets
|
|
* 16 bytes is a clock domain crossing tolerance
|
|
*
|
|
* Given RxFIFO Size, NUMP = RxFIFOSize / 1024;
|
|
*/
|
|
static void dwc3_gadget_setup_nump(struct dwc3 *dwc)
|
|
{
|
|
u32 ram2_depth;
|
|
u32 mdwidth;
|
|
u32 nump;
|
|
u32 reg;
|
|
|
|
ram2_depth = DWC3_GHWPARAMS7_RAM2_DEPTH(dwc->hwparams.hwparams7);
|
|
mdwidth = DWC3_GHWPARAMS0_MDWIDTH(dwc->hwparams.hwparams0);
|
|
|
|
nump = ((ram2_depth * mdwidth / 8) - 24 - 16) / 1024;
|
|
nump = min_t(u32, nump, 16);
|
|
|
|
/* update NumP */
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
|
|
reg &= ~DWC3_DCFG_NUMP_MASK;
|
|
reg |= nump << DWC3_DCFG_NUMP_SHIFT;
|
|
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
|
|
}
|
|
|
|
static int __dwc3_gadget_start(struct dwc3 *dwc)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
int ret = 0;
|
|
u32 reg;
|
|
|
|
/*
|
|
* Use IMOD if enabled via dwc->imod_interval. Otherwise, if
|
|
* the core supports IMOD, disable it.
|
|
*/
|
|
if (dwc->imod_interval) {
|
|
dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
|
|
dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
|
|
} else if (dwc3_has_imod(dwc)) {
|
|
dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), 0);
|
|
}
|
|
|
|
/*
|
|
* We are telling dwc3 that we want to use DCFG.NUMP as ACK TP's NUMP
|
|
* field instead of letting dwc3 itself calculate that automatically.
|
|
*
|
|
* This way, we maximize the chances that we'll be able to get several
|
|
* bursts of data without going through any sort of endpoint throttling.
|
|
*/
|
|
reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
|
|
if (dwc3_is_usb31(dwc))
|
|
reg &= ~DWC31_GRXTHRCFG_PKTCNTSEL;
|
|
else
|
|
reg &= ~DWC3_GRXTHRCFG_PKTCNTSEL;
|
|
|
|
dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
|
|
|
|
dwc3_gadget_setup_nump(dwc);
|
|
|
|
/* Start with SuperSpeed Default */
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
|
|
|
|
dep = dwc->eps[0];
|
|
ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
|
|
goto err0;
|
|
}
|
|
|
|
dep = dwc->eps[1];
|
|
ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_INIT);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
|
|
goto err1;
|
|
}
|
|
|
|
/* begin to receive SETUP packets */
|
|
dwc->ep0state = EP0_SETUP_PHASE;
|
|
dwc3_ep0_out_start(dwc);
|
|
|
|
dwc3_gadget_enable_irq(dwc);
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
__dwc3_gadget_ep_disable(dwc->eps[0]);
|
|
|
|
err0:
|
|
return ret;
|
|
}
|
|
|
|
static int dwc3_gadget_start(struct usb_gadget *g,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
int irq;
|
|
|
|
irq = dwc->irq_gadget;
|
|
ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
|
|
IRQF_SHARED, "dwc3", dwc->ev_buf);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
|
|
irq, ret);
|
|
goto err0;
|
|
}
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
if (dwc->gadget_driver) {
|
|
dev_err(dwc->dev, "%s is already bound to %s\n",
|
|
dwc->gadget.name,
|
|
dwc->gadget_driver->driver.name);
|
|
ret = -EBUSY;
|
|
goto err1;
|
|
}
|
|
|
|
dwc->gadget_driver = driver;
|
|
|
|
if (pm_runtime_active(dwc->dev))
|
|
__dwc3_gadget_start(dwc);
|
|
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
free_irq(irq, dwc);
|
|
|
|
err0:
|
|
return ret;
|
|
}
|
|
|
|
static void __dwc3_gadget_stop(struct dwc3 *dwc)
|
|
{
|
|
dwc3_gadget_disable_irq(dwc);
|
|
__dwc3_gadget_ep_disable(dwc->eps[0]);
|
|
__dwc3_gadget_ep_disable(dwc->eps[1]);
|
|
}
|
|
|
|
static int dwc3_gadget_stop(struct usb_gadget *g)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
unsigned long flags;
|
|
int epnum;
|
|
u32 tmo_eps = 0;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
|
|
if (pm_runtime_suspended(dwc->dev))
|
|
goto out;
|
|
|
|
__dwc3_gadget_stop(dwc);
|
|
|
|
for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
|
|
struct dwc3_ep *dep = dwc->eps[epnum];
|
|
int ret;
|
|
|
|
if (!dep)
|
|
continue;
|
|
|
|
if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
|
|
continue;
|
|
|
|
ret = wait_event_interruptible_lock_irq_timeout(dep->wait_end_transfer,
|
|
!(dep->flags & DWC3_EP_END_TRANSFER_PENDING),
|
|
dwc->lock, msecs_to_jiffies(5));
|
|
|
|
if (ret <= 0) {
|
|
/* Timed out or interrupted! There's nothing much
|
|
* we can do so we just log here and print which
|
|
* endpoints timed out at the end.
|
|
*/
|
|
tmo_eps |= 1 << epnum;
|
|
dep->flags &= DWC3_EP_END_TRANSFER_PENDING;
|
|
}
|
|
}
|
|
|
|
if (tmo_eps) {
|
|
dev_err(dwc->dev,
|
|
"end transfer timed out on endpoints 0x%x [bitmap]\n",
|
|
tmo_eps);
|
|
}
|
|
|
|
out:
|
|
dwc->gadget_driver = NULL;
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
free_irq(dwc->irq_gadget, dwc->ev_buf);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dwc3_gadget_set_speed(struct usb_gadget *g,
|
|
enum usb_device_speed speed)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
unsigned long flags;
|
|
u32 reg;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
|
|
reg &= ~(DWC3_DCFG_SPEED_MASK);
|
|
|
|
/*
|
|
* WORKAROUND: DWC3 revision < 2.20a have an issue
|
|
* which would cause metastability state on Run/Stop
|
|
* bit if we try to force the IP to USB2-only mode.
|
|
*
|
|
* Because of that, we cannot configure the IP to any
|
|
* speed other than the SuperSpeed
|
|
*
|
|
* Refers to:
|
|
*
|
|
* STAR#9000525659: Clock Domain Crossing on DCTL in
|
|
* USB 2.0 Mode
|
|
*/
|
|
if (dwc->revision < DWC3_REVISION_220A &&
|
|
!dwc->dis_metastability_quirk) {
|
|
reg |= DWC3_DCFG_SUPERSPEED;
|
|
} else {
|
|
switch (speed) {
|
|
case USB_SPEED_LOW:
|
|
reg |= DWC3_DCFG_LOWSPEED;
|
|
break;
|
|
case USB_SPEED_FULL:
|
|
reg |= DWC3_DCFG_FULLSPEED;
|
|
break;
|
|
case USB_SPEED_HIGH:
|
|
reg |= DWC3_DCFG_HIGHSPEED;
|
|
break;
|
|
case USB_SPEED_SUPER:
|
|
reg |= DWC3_DCFG_SUPERSPEED;
|
|
break;
|
|
case USB_SPEED_SUPER_PLUS:
|
|
if (dwc3_is_usb31(dwc))
|
|
reg |= DWC3_DCFG_SUPERSPEED_PLUS;
|
|
else
|
|
reg |= DWC3_DCFG_SUPERSPEED;
|
|
break;
|
|
default:
|
|
dev_err(dwc->dev, "invalid speed (%d)\n", speed);
|
|
|
|
if (dwc->revision & DWC3_REVISION_IS_DWC31)
|
|
reg |= DWC3_DCFG_SUPERSPEED_PLUS;
|
|
else
|
|
reg |= DWC3_DCFG_SUPERSPEED;
|
|
}
|
|
}
|
|
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
|
|
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
}
|
|
|
|
static const struct usb_gadget_ops dwc3_gadget_ops = {
|
|
.get_frame = dwc3_gadget_get_frame,
|
|
.wakeup = dwc3_gadget_wakeup,
|
|
.set_selfpowered = dwc3_gadget_set_selfpowered,
|
|
.pullup = dwc3_gadget_pullup,
|
|
.udc_start = dwc3_gadget_start,
|
|
.udc_stop = dwc3_gadget_stop,
|
|
.udc_set_speed = dwc3_gadget_set_speed,
|
|
};
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
static int dwc3_gadget_init_control_endpoint(struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
|
|
|
|
usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
|
|
dep->endpoint.maxburst = 1;
|
|
dep->endpoint.ops = &dwc3_gadget_ep0_ops;
|
|
if (!dep->direction)
|
|
dwc->gadget.ep0 = &dep->endpoint;
|
|
|
|
dep->endpoint.caps.type_control = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
|
|
int mdwidth;
|
|
int kbytes;
|
|
int size;
|
|
|
|
mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
|
|
/* MDWIDTH is represented in bits, we need it in bytes */
|
|
mdwidth /= 8;
|
|
|
|
size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1));
|
|
if (dwc3_is_usb31(dwc))
|
|
size = DWC31_GTXFIFOSIZ_TXFDEF(size);
|
|
else
|
|
size = DWC3_GTXFIFOSIZ_TXFDEF(size);
|
|
|
|
/* FIFO Depth is in MDWDITH bytes. Multiply */
|
|
size *= mdwidth;
|
|
|
|
kbytes = size / 1024;
|
|
if (kbytes == 0)
|
|
kbytes = 1;
|
|
|
|
/*
|
|
* FIFO sizes account an extra MDWIDTH * (kbytes + 1) bytes for
|
|
* internal overhead. We don't really know how these are used,
|
|
* but documentation say it exists.
|
|
*/
|
|
size -= mdwidth * (kbytes + 1);
|
|
size /= kbytes;
|
|
|
|
usb_ep_set_maxpacket_limit(&dep->endpoint, size);
|
|
|
|
dep->endpoint.max_streams = 15;
|
|
dep->endpoint.ops = &dwc3_gadget_ep_ops;
|
|
list_add_tail(&dep->endpoint.ep_list,
|
|
&dwc->gadget.ep_list);
|
|
dep->endpoint.caps.type_iso = true;
|
|
dep->endpoint.caps.type_bulk = true;
|
|
dep->endpoint.caps.type_int = true;
|
|
|
|
return dwc3_alloc_trb_pool(dep);
|
|
}
|
|
|
|
static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
|
|
|
|
usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
|
|
dep->endpoint.max_streams = 15;
|
|
dep->endpoint.ops = &dwc3_gadget_ep_ops;
|
|
list_add_tail(&dep->endpoint.ep_list,
|
|
&dwc->gadget.ep_list);
|
|
dep->endpoint.caps.type_iso = true;
|
|
dep->endpoint.caps.type_bulk = true;
|
|
dep->endpoint.caps.type_int = true;
|
|
|
|
return dwc3_alloc_trb_pool(dep);
|
|
}
|
|
|
|
static int dwc3_gadget_init_endpoint(struct dwc3 *dwc, u8 epnum)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
bool direction = epnum & 1;
|
|
int ret;
|
|
u8 num = epnum >> 1;
|
|
|
|
dep = kzalloc(sizeof(*dep), GFP_KERNEL);
|
|
if (!dep)
|
|
return -ENOMEM;
|
|
|
|
dep->dwc = dwc;
|
|
dep->number = epnum;
|
|
dep->direction = direction;
|
|
dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
|
|
dwc->eps[epnum] = dep;
|
|
|
|
snprintf(dep->name, sizeof(dep->name), "ep%u%s", num,
|
|
direction ? "in" : "out");
|
|
|
|
dep->endpoint.name = dep->name;
|
|
|
|
if (!(dep->number > 1)) {
|
|
dep->endpoint.desc = &dwc3_gadget_ep0_desc;
|
|
dep->endpoint.comp_desc = NULL;
|
|
}
|
|
|
|
spin_lock_init(&dep->lock);
|
|
|
|
if (num == 0)
|
|
ret = dwc3_gadget_init_control_endpoint(dep);
|
|
else if (direction)
|
|
ret = dwc3_gadget_init_in_endpoint(dep);
|
|
else
|
|
ret = dwc3_gadget_init_out_endpoint(dep);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
dep->endpoint.caps.dir_in = direction;
|
|
dep->endpoint.caps.dir_out = !direction;
|
|
|
|
INIT_LIST_HEAD(&dep->pending_list);
|
|
INIT_LIST_HEAD(&dep->started_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dwc3_gadget_init_endpoints(struct dwc3 *dwc, u8 total)
|
|
{
|
|
u8 epnum;
|
|
|
|
INIT_LIST_HEAD(&dwc->gadget.ep_list);
|
|
|
|
for (epnum = 0; epnum < total; epnum++) {
|
|
int ret;
|
|
|
|
ret = dwc3_gadget_init_endpoint(dwc, epnum);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dwc3_gadget_free_endpoints(struct dwc3 *dwc)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
u8 epnum;
|
|
|
|
for (epnum = 0; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
|
|
dep = dwc->eps[epnum];
|
|
if (!dep)
|
|
continue;
|
|
/*
|
|
* Physical endpoints 0 and 1 are special; they form the
|
|
* bi-directional USB endpoint 0.
|
|
*
|
|
* For those two physical endpoints, we don't allocate a TRB
|
|
* pool nor do we add them the endpoints list. Due to that, we
|
|
* shouldn't do these two operations otherwise we would end up
|
|
* with all sorts of bugs when removing dwc3.ko.
|
|
*/
|
|
if (epnum != 0 && epnum != 1) {
|
|
dwc3_free_trb_pool(dep);
|
|
list_del(&dep->endpoint.ep_list);
|
|
}
|
|
|
|
kfree(dep);
|
|
}
|
|
}
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
static int dwc3_gadget_ep_reclaim_completed_trb(struct dwc3_ep *dep,
|
|
struct dwc3_request *req, struct dwc3_trb *trb,
|
|
const struct dwc3_event_depevt *event, int status, int chain)
|
|
{
|
|
unsigned int count;
|
|
|
|
dwc3_ep_inc_deq(dep);
|
|
|
|
trace_dwc3_complete_trb(dep, trb);
|
|
|
|
/*
|
|
* If we're in the middle of series of chained TRBs and we
|
|
* receive a short transfer along the way, DWC3 will skip
|
|
* through all TRBs including the last TRB in the chain (the
|
|
* where CHN bit is zero. DWC3 will also avoid clearing HWO
|
|
* bit and SW has to do it manually.
|
|
*
|
|
* We're going to do that here to avoid problems of HW trying
|
|
* to use bogus TRBs for transfers.
|
|
*/
|
|
if (chain && (trb->ctrl & DWC3_TRB_CTRL_HWO))
|
|
trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
|
|
|
|
/*
|
|
* If we're dealing with unaligned size OUT transfer, we will be left
|
|
* with one TRB pending in the ring. We need to manually clear HWO bit
|
|
* from that TRB.
|
|
*/
|
|
if ((req->zero || req->unaligned) && (trb->ctrl & DWC3_TRB_CTRL_HWO)) {
|
|
trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
|
|
return 1;
|
|
}
|
|
|
|
count = trb->size & DWC3_TRB_SIZE_MASK;
|
|
req->remaining += count;
|
|
|
|
if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
|
|
return 1;
|
|
|
|
if (event->status & DEPEVT_STATUS_SHORT && !chain)
|
|
return 1;
|
|
|
|
if (event->status & DEPEVT_STATUS_IOC)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dwc3_gadget_ep_reclaim_trb_sg(struct dwc3_ep *dep,
|
|
struct dwc3_request *req, const struct dwc3_event_depevt *event,
|
|
int status)
|
|
{
|
|
struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
|
|
struct scatterlist *sg = req->sg;
|
|
struct scatterlist *s;
|
|
unsigned int pending = req->num_pending_sgs;
|
|
unsigned int i;
|
|
int ret = 0;
|
|
|
|
for_each_sg(sg, s, pending, i) {
|
|
trb = &dep->trb_pool[dep->trb_dequeue];
|
|
|
|
if (trb->ctrl & DWC3_TRB_CTRL_HWO)
|
|
break;
|
|
|
|
req->sg = sg_next(s);
|
|
req->num_pending_sgs--;
|
|
|
|
ret = dwc3_gadget_ep_reclaim_completed_trb(dep, req,
|
|
trb, event, status, true);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dwc3_gadget_ep_reclaim_trb_linear(struct dwc3_ep *dep,
|
|
struct dwc3_request *req, const struct dwc3_event_depevt *event,
|
|
int status)
|
|
{
|
|
struct dwc3_trb *trb = &dep->trb_pool[dep->trb_dequeue];
|
|
|
|
return dwc3_gadget_ep_reclaim_completed_trb(dep, req, trb,
|
|
event, status, false);
|
|
}
|
|
|
|
static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req)
|
|
{
|
|
return req->request.actual == req->request.length;
|
|
}
|
|
|
|
static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
|
|
const struct dwc3_event_depevt *event,
|
|
struct dwc3_request *req, int status)
|
|
{
|
|
int ret;
|
|
|
|
if (req->num_pending_sgs)
|
|
ret = dwc3_gadget_ep_reclaim_trb_sg(dep, req, event,
|
|
status);
|
|
else
|
|
ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
|
|
status);
|
|
|
|
if (req->unaligned || req->zero) {
|
|
ret = dwc3_gadget_ep_reclaim_trb_linear(dep, req, event,
|
|
status);
|
|
req->unaligned = false;
|
|
req->zero = false;
|
|
}
|
|
|
|
req->request.actual = req->request.length - req->remaining;
|
|
|
|
if (!dwc3_gadget_ep_request_completed(req) &&
|
|
req->num_pending_sgs) {
|
|
__dwc3_gadget_kick_transfer(dep);
|
|
goto out;
|
|
}
|
|
|
|
dwc3_gadget_giveback(dep, req, status);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
|
|
const struct dwc3_event_depevt *event, int status)
|
|
{
|
|
struct dwc3_request *req;
|
|
struct dwc3_request *tmp;
|
|
|
|
list_for_each_entry_safe(req, tmp, &dep->started_list, list) {
|
|
int ret;
|
|
|
|
ret = dwc3_gadget_ep_cleanup_completed_request(dep, event,
|
|
req, status);
|
|
if (ret)
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dwc3_gadget_endpoint_frame_from_event(struct dwc3_ep *dep,
|
|
const struct dwc3_event_depevt *event)
|
|
{
|
|
dep->frame_number = event->parameters;
|
|
}
|
|
|
|
static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
|
|
const struct dwc3_event_depevt *event)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
|
|
unsigned status = 0;
|
|
bool stop = false;
|
|
|
|
dwc3_gadget_endpoint_frame_from_event(dep, event);
|
|
|
|
if (event->status & DEPEVT_STATUS_BUSERR)
|
|
status = -ECONNRESET;
|
|
|
|
if (event->status & DEPEVT_STATUS_MISSED_ISOC) {
|
|
status = -EXDEV;
|
|
|
|
if (list_empty(&dep->started_list))
|
|
stop = true;
|
|
}
|
|
|
|
dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
|
|
|
|
if (stop) {
|
|
dwc3_stop_active_transfer(dep, true);
|
|
dep->flags = DWC3_EP_ENABLED;
|
|
}
|
|
|
|
/*
|
|
* WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
|
|
* See dwc3_gadget_linksts_change_interrupt() for 1st half.
|
|
*/
|
|
if (dwc->revision < DWC3_REVISION_183A) {
|
|
u32 reg;
|
|
int i;
|
|
|
|
for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
|
|
dep = dwc->eps[i];
|
|
|
|
if (!(dep->flags & DWC3_EP_ENABLED))
|
|
continue;
|
|
|
|
if (!list_empty(&dep->started_list))
|
|
return;
|
|
}
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
|
|
reg |= dwc->u1u2;
|
|
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
|
|
|
|
dwc->u1u2 = 0;
|
|
}
|
|
}
|
|
|
|
static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
|
|
const struct dwc3_event_depevt *event)
|
|
{
|
|
dwc3_gadget_endpoint_frame_from_event(dep, event);
|
|
__dwc3_gadget_start_isoc(dep);
|
|
}
|
|
|
|
static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
|
|
const struct dwc3_event_depevt *event)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
u8 epnum = event->endpoint_number;
|
|
u8 cmd;
|
|
|
|
dep = dwc->eps[epnum];
|
|
|
|
if (!(dep->flags & DWC3_EP_ENABLED)) {
|
|
if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
|
|
return;
|
|
|
|
/* Handle only EPCMDCMPLT when EP disabled */
|
|
if (event->endpoint_event != DWC3_DEPEVT_EPCMDCMPLT)
|
|
return;
|
|
}
|
|
|
|
if (epnum == 0 || epnum == 1) {
|
|
dwc3_ep0_interrupt(dwc, event);
|
|
return;
|
|
}
|
|
|
|
switch (event->endpoint_event) {
|
|
case DWC3_DEPEVT_XFERINPROGRESS:
|
|
dwc3_gadget_endpoint_transfer_in_progress(dep, event);
|
|
break;
|
|
case DWC3_DEPEVT_XFERNOTREADY:
|
|
dwc3_gadget_endpoint_transfer_not_ready(dep, event);
|
|
break;
|
|
case DWC3_DEPEVT_EPCMDCMPLT:
|
|
cmd = DEPEVT_PARAMETER_CMD(event->parameters);
|
|
|
|
if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
|
|
dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
|
|
wake_up(&dep->wait_end_transfer);
|
|
}
|
|
break;
|
|
case DWC3_DEPEVT_STREAMEVT:
|
|
case DWC3_DEPEVT_XFERCOMPLETE:
|
|
case DWC3_DEPEVT_RXTXFIFOEVT:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dwc3_disconnect_gadget(struct dwc3 *dwc)
|
|
{
|
|
if (dwc->gadget_driver && dwc->gadget_driver->disconnect) {
|
|
spin_unlock(&dwc->lock);
|
|
dwc->gadget_driver->disconnect(&dwc->gadget);
|
|
spin_lock(&dwc->lock);
|
|
}
|
|
}
|
|
|
|
static void dwc3_suspend_gadget(struct dwc3 *dwc)
|
|
{
|
|
if (dwc->gadget_driver && dwc->gadget_driver->suspend) {
|
|
spin_unlock(&dwc->lock);
|
|
dwc->gadget_driver->suspend(&dwc->gadget);
|
|
spin_lock(&dwc->lock);
|
|
}
|
|
}
|
|
|
|
static void dwc3_resume_gadget(struct dwc3 *dwc)
|
|
{
|
|
if (dwc->gadget_driver && dwc->gadget_driver->resume) {
|
|
spin_unlock(&dwc->lock);
|
|
dwc->gadget_driver->resume(&dwc->gadget);
|
|
spin_lock(&dwc->lock);
|
|
}
|
|
}
|
|
|
|
static void dwc3_reset_gadget(struct dwc3 *dwc)
|
|
{
|
|
if (!dwc->gadget_driver)
|
|
return;
|
|
|
|
if (dwc->gadget.speed != USB_SPEED_UNKNOWN) {
|
|
spin_unlock(&dwc->lock);
|
|
usb_gadget_udc_reset(&dwc->gadget, dwc->gadget_driver);
|
|
spin_lock(&dwc->lock);
|
|
}
|
|
}
|
|
|
|
static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
|
|
struct dwc3_gadget_ep_cmd_params params;
|
|
u32 cmd;
|
|
int ret;
|
|
|
|
if ((dep->flags & DWC3_EP_END_TRANSFER_PENDING) ||
|
|
!dep->resource_index)
|
|
return;
|
|
|
|
/*
|
|
* NOTICE: We are violating what the Databook says about the
|
|
* EndTransfer command. Ideally we would _always_ wait for the
|
|
* EndTransfer Command Completion IRQ, but that's causing too
|
|
* much trouble synchronizing between us and gadget driver.
|
|
*
|
|
* We have discussed this with the IP Provider and it was
|
|
* suggested to giveback all requests here, but give HW some
|
|
* extra time to synchronize with the interconnect. We're using
|
|
* an arbitrary 100us delay for that.
|
|
*
|
|
* Note also that a similar handling was tested by Synopsys
|
|
* (thanks a lot Paul) and nothing bad has come out of it.
|
|
* In short, what we're doing is:
|
|
*
|
|
* - Issue EndTransfer WITH CMDIOC bit set
|
|
* - Wait 100us
|
|
*
|
|
* As of IP version 3.10a of the DWC_usb3 IP, the controller
|
|
* supports a mode to work around the above limitation. The
|
|
* software can poll the CMDACT bit in the DEPCMD register
|
|
* after issuing a EndTransfer command. This mode is enabled
|
|
* by writing GUCTL2[14]. This polling is already done in the
|
|
* dwc3_send_gadget_ep_cmd() function so if the mode is
|
|
* enabled, the EndTransfer command will have completed upon
|
|
* returning from this function and we don't need to delay for
|
|
* 100us.
|
|
*
|
|
* This mode is NOT available on the DWC_usb31 IP.
|
|
*/
|
|
|
|
cmd = DWC3_DEPCMD_ENDTRANSFER;
|
|
cmd |= force ? DWC3_DEPCMD_HIPRI_FORCERM : 0;
|
|
cmd |= DWC3_DEPCMD_CMDIOC;
|
|
cmd |= DWC3_DEPCMD_PARAM(dep->resource_index);
|
|
memset(¶ms, 0, sizeof(params));
|
|
ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms);
|
|
WARN_ON_ONCE(ret);
|
|
dep->resource_index = 0;
|
|
|
|
if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A) {
|
|
dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
|
|
udelay(100);
|
|
}
|
|
}
|
|
|
|
static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
|
|
{
|
|
u32 epnum;
|
|
|
|
for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
|
|
struct dwc3_ep *dep;
|
|
int ret;
|
|
|
|
dep = dwc->eps[epnum];
|
|
if (!dep)
|
|
continue;
|
|
|
|
if (!(dep->flags & DWC3_EP_STALL))
|
|
continue;
|
|
|
|
dep->flags &= ~DWC3_EP_STALL;
|
|
|
|
ret = dwc3_send_clear_stall_ep_cmd(dep);
|
|
WARN_ON_ONCE(ret);
|
|
}
|
|
}
|
|
|
|
static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
|
|
{
|
|
int reg;
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
|
|
reg &= ~DWC3_DCTL_INITU1ENA;
|
|
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
|
|
|
|
reg &= ~DWC3_DCTL_INITU2ENA;
|
|
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
|
|
|
|
dwc3_disconnect_gadget(dwc);
|
|
|
|
dwc->gadget.speed = USB_SPEED_UNKNOWN;
|
|
dwc->setup_packet_pending = false;
|
|
usb_gadget_set_state(&dwc->gadget, USB_STATE_NOTATTACHED);
|
|
|
|
dwc->connected = false;
|
|
}
|
|
|
|
static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
|
|
{
|
|
u32 reg;
|
|
|
|
dwc->connected = true;
|
|
|
|
/*
|
|
* WORKAROUND: DWC3 revisions <1.88a have an issue which
|
|
* would cause a missing Disconnect Event if there's a
|
|
* pending Setup Packet in the FIFO.
|
|
*
|
|
* There's no suggested workaround on the official Bug
|
|
* report, which states that "unless the driver/application
|
|
* is doing any special handling of a disconnect event,
|
|
* there is no functional issue".
|
|
*
|
|
* Unfortunately, it turns out that we _do_ some special
|
|
* handling of a disconnect event, namely complete all
|
|
* pending transfers, notify gadget driver of the
|
|
* disconnection, and so on.
|
|
*
|
|
* Our suggested workaround is to follow the Disconnect
|
|
* Event steps here, instead, based on a setup_packet_pending
|
|
* flag. Such flag gets set whenever we have a SETUP_PENDING
|
|
* status for EP0 TRBs and gets cleared on XferComplete for the
|
|
* same endpoint.
|
|
*
|
|
* Refers to:
|
|
*
|
|
* STAR#9000466709: RTL: Device : Disconnect event not
|
|
* generated if setup packet pending in FIFO
|
|
*/
|
|
if (dwc->revision < DWC3_REVISION_188A) {
|
|
if (dwc->setup_packet_pending)
|
|
dwc3_gadget_disconnect_interrupt(dwc);
|
|
}
|
|
|
|
dwc3_reset_gadget(dwc);
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
|
|
reg &= ~DWC3_DCTL_TSTCTRL_MASK;
|
|
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
|
|
dwc->test_mode = false;
|
|
dwc3_clear_stall_all_ep(dwc);
|
|
|
|
/* Reset device address to zero */
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
|
|
reg &= ~(DWC3_DCFG_DEVADDR_MASK);
|
|
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
|
|
}
|
|
|
|
static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
int ret;
|
|
u32 reg;
|
|
u8 speed;
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
|
|
speed = reg & DWC3_DSTS_CONNECTSPD;
|
|
dwc->speed = speed;
|
|
|
|
/*
|
|
* RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
|
|
* each time on Connect Done.
|
|
*
|
|
* Currently we always use the reset value. If any platform
|
|
* wants to set this to a different value, we need to add a
|
|
* setting and update GCTL.RAMCLKSEL here.
|
|
*/
|
|
|
|
switch (speed) {
|
|
case DWC3_DSTS_SUPERSPEED_PLUS:
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
|
|
dwc->gadget.ep0->maxpacket = 512;
|
|
dwc->gadget.speed = USB_SPEED_SUPER_PLUS;
|
|
break;
|
|
case DWC3_DSTS_SUPERSPEED:
|
|
/*
|
|
* WORKAROUND: DWC3 revisions <1.90a have an issue which
|
|
* would cause a missing USB3 Reset event.
|
|
*
|
|
* In such situations, we should force a USB3 Reset
|
|
* event by calling our dwc3_gadget_reset_interrupt()
|
|
* routine.
|
|
*
|
|
* Refers to:
|
|
*
|
|
* STAR#9000483510: RTL: SS : USB3 reset event may
|
|
* not be generated always when the link enters poll
|
|
*/
|
|
if (dwc->revision < DWC3_REVISION_190A)
|
|
dwc3_gadget_reset_interrupt(dwc);
|
|
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
|
|
dwc->gadget.ep0->maxpacket = 512;
|
|
dwc->gadget.speed = USB_SPEED_SUPER;
|
|
break;
|
|
case DWC3_DSTS_HIGHSPEED:
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
|
|
dwc->gadget.ep0->maxpacket = 64;
|
|
dwc->gadget.speed = USB_SPEED_HIGH;
|
|
break;
|
|
case DWC3_DSTS_FULLSPEED:
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
|
|
dwc->gadget.ep0->maxpacket = 64;
|
|
dwc->gadget.speed = USB_SPEED_FULL;
|
|
break;
|
|
case DWC3_DSTS_LOWSPEED:
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
|
|
dwc->gadget.ep0->maxpacket = 8;
|
|
dwc->gadget.speed = USB_SPEED_LOW;
|
|
break;
|
|
}
|
|
|
|
dwc->eps[1]->endpoint.maxpacket = dwc->gadget.ep0->maxpacket;
|
|
|
|
/* Enable USB2 LPM Capability */
|
|
|
|
if ((dwc->revision > DWC3_REVISION_194A) &&
|
|
(speed != DWC3_DSTS_SUPERSPEED) &&
|
|
(speed != DWC3_DSTS_SUPERSPEED_PLUS)) {
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
|
|
reg |= DWC3_DCFG_LPM_CAP;
|
|
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
|
|
reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
|
|
|
|
reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);
|
|
|
|
/*
|
|
* When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
|
|
* DCFG.LPMCap is set, core responses with an ACK and the
|
|
* BESL value in the LPM token is less than or equal to LPM
|
|
* NYET threshold.
|
|
*/
|
|
WARN_ONCE(dwc->revision < DWC3_REVISION_240A
|
|
&& dwc->has_lpm_erratum,
|
|
"LPM Erratum not available on dwc3 revisions < 2.40a\n");
|
|
|
|
if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
|
|
reg |= DWC3_DCTL_LPM_ERRATA(dwc->lpm_nyet_threshold);
|
|
|
|
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
|
|
} else {
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
|
|
reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
|
|
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
|
|
}
|
|
|
|
dep = dwc->eps[0];
|
|
ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
|
|
return;
|
|
}
|
|
|
|
dep = dwc->eps[1];
|
|
ret = __dwc3_gadget_ep_enable(dep, DWC3_DEPCFG_ACTION_MODIFY);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Configure PHY via GUSB3PIPECTLn if required.
|
|
*
|
|
* Update GTXFIFOSIZn
|
|
*
|
|
* In both cases reset values should be sufficient.
|
|
*/
|
|
}
|
|
|
|
static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
|
|
{
|
|
/*
|
|
* TODO take core out of low power mode when that's
|
|
* implemented.
|
|
*/
|
|
|
|
if (dwc->gadget_driver && dwc->gadget_driver->resume) {
|
|
spin_unlock(&dwc->lock);
|
|
dwc->gadget_driver->resume(&dwc->gadget);
|
|
spin_lock(&dwc->lock);
|
|
}
|
|
}
|
|
|
|
static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
|
|
unsigned int evtinfo)
|
|
{
|
|
enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
|
|
unsigned int pwropt;
|
|
|
|
/*
|
|
* WORKAROUND: DWC3 < 2.50a have an issue when configured without
|
|
* Hibernation mode enabled which would show up when device detects
|
|
* host-initiated U3 exit.
|
|
*
|
|
* In that case, device will generate a Link State Change Interrupt
|
|
* from U3 to RESUME which is only necessary if Hibernation is
|
|
* configured in.
|
|
*
|
|
* There are no functional changes due to such spurious event and we
|
|
* just need to ignore it.
|
|
*
|
|
* Refers to:
|
|
*
|
|
* STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
|
|
* operational mode
|
|
*/
|
|
pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
|
|
if ((dwc->revision < DWC3_REVISION_250A) &&
|
|
(pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
|
|
if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
|
|
(next == DWC3_LINK_STATE_RESUME)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending
|
|
* on the link partner, the USB session might do multiple entry/exit
|
|
* of low power states before a transfer takes place.
|
|
*
|
|
* Due to this problem, we might experience lower throughput. The
|
|
* suggested workaround is to disable DCTL[12:9] bits if we're
|
|
* transitioning from U1/U2 to U0 and enable those bits again
|
|
* after a transfer completes and there are no pending transfers
|
|
* on any of the enabled endpoints.
|
|
*
|
|
* This is the first half of that workaround.
|
|
*
|
|
* Refers to:
|
|
*
|
|
* STAR#9000446952: RTL: Device SS : if U1/U2 ->U0 takes >128us
|
|
* core send LGO_Ux entering U0
|
|
*/
|
|
if (dwc->revision < DWC3_REVISION_183A) {
|
|
if (next == DWC3_LINK_STATE_U0) {
|
|
u32 u1u2;
|
|
u32 reg;
|
|
|
|
switch (dwc->link_state) {
|
|
case DWC3_LINK_STATE_U1:
|
|
case DWC3_LINK_STATE_U2:
|
|
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
|
|
u1u2 = reg & (DWC3_DCTL_INITU2ENA
|
|
| DWC3_DCTL_ACCEPTU2ENA
|
|
| DWC3_DCTL_INITU1ENA
|
|
| DWC3_DCTL_ACCEPTU1ENA);
|
|
|
|
if (!dwc->u1u2)
|
|
dwc->u1u2 = reg & u1u2;
|
|
|
|
reg &= ~u1u2;
|
|
|
|
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
|
|
break;
|
|
default:
|
|
/* do nothing */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
switch (next) {
|
|
case DWC3_LINK_STATE_U1:
|
|
if (dwc->speed == USB_SPEED_SUPER)
|
|
dwc3_suspend_gadget(dwc);
|
|
break;
|
|
case DWC3_LINK_STATE_U2:
|
|
case DWC3_LINK_STATE_U3:
|
|
dwc3_suspend_gadget(dwc);
|
|
break;
|
|
case DWC3_LINK_STATE_RESUME:
|
|
dwc3_resume_gadget(dwc);
|
|
break;
|
|
default:
|
|
/* do nothing */
|
|
break;
|
|
}
|
|
|
|
dwc->link_state = next;
|
|
}
|
|
|
|
static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
|
|
unsigned int evtinfo)
|
|
{
|
|
enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
|
|
|
|
if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
|
|
dwc3_suspend_gadget(dwc);
|
|
|
|
dwc->link_state = next;
|
|
}
|
|
|
|
static void dwc3_gadget_hibernation_interrupt(struct dwc3 *dwc,
|
|
unsigned int evtinfo)
|
|
{
|
|
unsigned int is_ss = evtinfo & BIT(4);
|
|
|
|
/*
|
|
* WORKAROUND: DWC3 revison 2.20a with hibernation support
|
|
* have a known issue which can cause USB CV TD.9.23 to fail
|
|
* randomly.
|
|
*
|
|
* Because of this issue, core could generate bogus hibernation
|
|
* events which SW needs to ignore.
|
|
*
|
|
* Refers to:
|
|
*
|
|
* STAR#9000546576: Device Mode Hibernation: Issue in USB 2.0
|
|
* Device Fallback from SuperSpeed
|
|
*/
|
|
if (is_ss ^ (dwc->speed == USB_SPEED_SUPER))
|
|
return;
|
|
|
|
/* enter hibernation here */
|
|
}
|
|
|
|
static void dwc3_gadget_interrupt(struct dwc3 *dwc,
|
|
const struct dwc3_event_devt *event)
|
|
{
|
|
switch (event->type) {
|
|
case DWC3_DEVICE_EVENT_DISCONNECT:
|
|
dwc3_gadget_disconnect_interrupt(dwc);
|
|
break;
|
|
case DWC3_DEVICE_EVENT_RESET:
|
|
dwc3_gadget_reset_interrupt(dwc);
|
|
break;
|
|
case DWC3_DEVICE_EVENT_CONNECT_DONE:
|
|
dwc3_gadget_conndone_interrupt(dwc);
|
|
break;
|
|
case DWC3_DEVICE_EVENT_WAKEUP:
|
|
dwc3_gadget_wakeup_interrupt(dwc);
|
|
break;
|
|
case DWC3_DEVICE_EVENT_HIBER_REQ:
|
|
if (dev_WARN_ONCE(dwc->dev, !dwc->has_hibernation,
|
|
"unexpected hibernation event\n"))
|
|
break;
|
|
|
|
dwc3_gadget_hibernation_interrupt(dwc, event->event_info);
|
|
break;
|
|
case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
|
|
dwc3_gadget_linksts_change_interrupt(dwc, event->event_info);
|
|
break;
|
|
case DWC3_DEVICE_EVENT_EOPF:
|
|
/* It changed to be suspend event for version 2.30a and above */
|
|
if (dwc->revision >= DWC3_REVISION_230A) {
|
|
/*
|
|
* Ignore suspend event until the gadget enters into
|
|
* USB_STATE_CONFIGURED state.
|
|
*/
|
|
if (dwc->gadget.state >= USB_STATE_CONFIGURED)
|
|
dwc3_gadget_suspend_interrupt(dwc,
|
|
event->event_info);
|
|
}
|
|
break;
|
|
case DWC3_DEVICE_EVENT_SOF:
|
|
case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
|
|
case DWC3_DEVICE_EVENT_CMD_CMPL:
|
|
case DWC3_DEVICE_EVENT_OVERFLOW:
|
|
break;
|
|
default:
|
|
dev_WARN(dwc->dev, "UNKNOWN IRQ %d\n", event->type);
|
|
}
|
|
}
|
|
|
|
static void dwc3_process_event_entry(struct dwc3 *dwc,
|
|
const union dwc3_event *event)
|
|
{
|
|
trace_dwc3_event(event->raw, dwc);
|
|
|
|
if (!event->type.is_devspec)
|
|
dwc3_endpoint_interrupt(dwc, &event->depevt);
|
|
else if (event->type.type == DWC3_EVENT_TYPE_DEV)
|
|
dwc3_gadget_interrupt(dwc, &event->devt);
|
|
else
|
|
dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
|
|
}
|
|
|
|
static irqreturn_t dwc3_process_event_buf(struct dwc3_event_buffer *evt)
|
|
{
|
|
struct dwc3 *dwc = evt->dwc;
|
|
irqreturn_t ret = IRQ_NONE;
|
|
int left;
|
|
u32 reg;
|
|
|
|
left = evt->count;
|
|
|
|
if (!(evt->flags & DWC3_EVENT_PENDING))
|
|
return IRQ_NONE;
|
|
|
|
while (left > 0) {
|
|
union dwc3_event event;
|
|
|
|
event.raw = *(u32 *) (evt->cache + evt->lpos);
|
|
|
|
dwc3_process_event_entry(dwc, &event);
|
|
|
|
/*
|
|
* FIXME we wrap around correctly to the next entry as
|
|
* almost all entries are 4 bytes in size. There is one
|
|
* entry which has 12 bytes which is a regular entry
|
|
* followed by 8 bytes data. ATM I don't know how
|
|
* things are organized if we get next to the a
|
|
* boundary so I worry about that once we try to handle
|
|
* that.
|
|
*/
|
|
evt->lpos = (evt->lpos + 4) % evt->length;
|
|
left -= 4;
|
|
}
|
|
|
|
evt->count = 0;
|
|
evt->flags &= ~DWC3_EVENT_PENDING;
|
|
ret = IRQ_HANDLED;
|
|
|
|
/* Unmask interrupt */
|
|
reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
|
|
reg &= ~DWC3_GEVNTSIZ_INTMASK;
|
|
dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
|
|
|
|
if (dwc->imod_interval) {
|
|
dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), DWC3_GEVNTCOUNT_EHB);
|
|
dwc3_writel(dwc->regs, DWC3_DEV_IMOD(0), dwc->imod_interval);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t dwc3_thread_interrupt(int irq, void *_evt)
|
|
{
|
|
struct dwc3_event_buffer *evt = _evt;
|
|
struct dwc3 *dwc = evt->dwc;
|
|
unsigned long flags;
|
|
irqreturn_t ret = IRQ_NONE;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
ret = dwc3_process_event_buf(evt);
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt)
|
|
{
|
|
struct dwc3 *dwc = evt->dwc;
|
|
u32 amount;
|
|
u32 count;
|
|
u32 reg;
|
|
|
|
if (pm_runtime_suspended(dwc->dev)) {
|
|
pm_runtime_get(dwc->dev);
|
|
disable_irq_nosync(dwc->irq_gadget);
|
|
dwc->pending_events = true;
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* With PCIe legacy interrupt, test shows that top-half irq handler can
|
|
* be called again after HW interrupt deassertion. Check if bottom-half
|
|
* irq event handler completes before caching new event to prevent
|
|
* losing events.
|
|
*/
|
|
if (evt->flags & DWC3_EVENT_PENDING)
|
|
return IRQ_HANDLED;
|
|
|
|
count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
|
|
count &= DWC3_GEVNTCOUNT_MASK;
|
|
if (!count)
|
|
return IRQ_NONE;
|
|
|
|
evt->count = count;
|
|
evt->flags |= DWC3_EVENT_PENDING;
|
|
|
|
/* Mask interrupt */
|
|
reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(0));
|
|
reg |= DWC3_GEVNTSIZ_INTMASK;
|
|
dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), reg);
|
|
|
|
amount = min(count, evt->length - evt->lpos);
|
|
memcpy(evt->cache + evt->lpos, evt->buf + evt->lpos, amount);
|
|
|
|
if (amount < count)
|
|
memcpy(evt->cache, evt->buf, count - amount);
|
|
|
|
dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count);
|
|
|
|
return IRQ_WAKE_THREAD;
|
|
}
|
|
|
|
static irqreturn_t dwc3_interrupt(int irq, void *_evt)
|
|
{
|
|
struct dwc3_event_buffer *evt = _evt;
|
|
|
|
return dwc3_check_event_buf(evt);
|
|
}
|
|
|
|
static int dwc3_gadget_get_irq(struct dwc3 *dwc)
|
|
{
|
|
struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
|
|
int irq;
|
|
|
|
irq = platform_get_irq_byname(dwc3_pdev, "peripheral");
|
|
if (irq > 0)
|
|
goto out;
|
|
|
|
if (irq == -EPROBE_DEFER)
|
|
goto out;
|
|
|
|
irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
|
|
if (irq > 0)
|
|
goto out;
|
|
|
|
if (irq == -EPROBE_DEFER)
|
|
goto out;
|
|
|
|
irq = platform_get_irq(dwc3_pdev, 0);
|
|
if (irq > 0)
|
|
goto out;
|
|
|
|
if (irq != -EPROBE_DEFER)
|
|
dev_err(dwc->dev, "missing peripheral IRQ\n");
|
|
|
|
if (!irq)
|
|
irq = -EINVAL;
|
|
|
|
out:
|
|
return irq;
|
|
}
|
|
|
|
/**
|
|
* dwc3_gadget_init - initializes gadget related registers
|
|
* @dwc: pointer to our controller context structure
|
|
*
|
|
* Returns 0 on success otherwise negative errno.
|
|
*/
|
|
int dwc3_gadget_init(struct dwc3 *dwc)
|
|
{
|
|
int ret;
|
|
int irq;
|
|
|
|
irq = dwc3_gadget_get_irq(dwc);
|
|
if (irq < 0) {
|
|
ret = irq;
|
|
goto err0;
|
|
}
|
|
|
|
dwc->irq_gadget = irq;
|
|
|
|
dwc->ep0_trb = dma_alloc_coherent(dwc->sysdev,
|
|
sizeof(*dwc->ep0_trb) * 2,
|
|
&dwc->ep0_trb_addr, GFP_KERNEL);
|
|
if (!dwc->ep0_trb) {
|
|
dev_err(dwc->dev, "failed to allocate ep0 trb\n");
|
|
ret = -ENOMEM;
|
|
goto err0;
|
|
}
|
|
|
|
dwc->setup_buf = kzalloc(DWC3_EP0_SETUP_SIZE, GFP_KERNEL);
|
|
if (!dwc->setup_buf) {
|
|
ret = -ENOMEM;
|
|
goto err1;
|
|
}
|
|
|
|
dwc->bounce = dma_alloc_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE,
|
|
&dwc->bounce_addr, GFP_KERNEL);
|
|
if (!dwc->bounce) {
|
|
ret = -ENOMEM;
|
|
goto err2;
|
|
}
|
|
|
|
init_completion(&dwc->ep0_in_setup);
|
|
|
|
dwc->gadget.ops = &dwc3_gadget_ops;
|
|
dwc->gadget.speed = USB_SPEED_UNKNOWN;
|
|
dwc->gadget.sg_supported = true;
|
|
dwc->gadget.name = "dwc3-gadget";
|
|
dwc->gadget.is_otg = dwc->dr_mode == USB_DR_MODE_OTG;
|
|
|
|
/*
|
|
* FIXME We might be setting max_speed to <SUPER, however versions
|
|
* <2.20a of dwc3 have an issue with metastability (documented
|
|
* elsewhere in this driver) which tells us we can't set max speed to
|
|
* anything lower than SUPER.
|
|
*
|
|
* Because gadget.max_speed is only used by composite.c and function
|
|
* drivers (i.e. it won't go into dwc3's registers) we are allowing this
|
|
* to happen so we avoid sending SuperSpeed Capability descriptor
|
|
* together with our BOS descriptor as that could confuse host into
|
|
* thinking we can handle super speed.
|
|
*
|
|
* Note that, in fact, we won't even support GetBOS requests when speed
|
|
* is less than super speed because we don't have means, yet, to tell
|
|
* composite.c that we are USB 2.0 + LPM ECN.
|
|
*/
|
|
if (dwc->revision < DWC3_REVISION_220A &&
|
|
!dwc->dis_metastability_quirk)
|
|
dev_info(dwc->dev, "changing max_speed on rev %08x\n",
|
|
dwc->revision);
|
|
|
|
dwc->gadget.max_speed = dwc->maximum_speed;
|
|
|
|
/*
|
|
* REVISIT: Here we should clear all pending IRQs to be
|
|
* sure we're starting from a well known location.
|
|
*/
|
|
|
|
ret = dwc3_gadget_init_endpoints(dwc, dwc->num_eps);
|
|
if (ret)
|
|
goto err3;
|
|
|
|
ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to register udc\n");
|
|
goto err4;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err4:
|
|
dwc3_gadget_free_endpoints(dwc);
|
|
|
|
err3:
|
|
dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
|
|
dwc->bounce_addr);
|
|
|
|
err2:
|
|
kfree(dwc->setup_buf);
|
|
|
|
err1:
|
|
dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
|
|
dwc->ep0_trb, dwc->ep0_trb_addr);
|
|
|
|
err0:
|
|
return ret;
|
|
}
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
void dwc3_gadget_exit(struct dwc3 *dwc)
|
|
{
|
|
usb_del_gadget_udc(&dwc->gadget);
|
|
dwc3_gadget_free_endpoints(dwc);
|
|
dma_free_coherent(dwc->sysdev, DWC3_BOUNCE_SIZE, dwc->bounce,
|
|
dwc->bounce_addr);
|
|
kfree(dwc->setup_buf);
|
|
dma_free_coherent(dwc->sysdev, sizeof(*dwc->ep0_trb) * 2,
|
|
dwc->ep0_trb, dwc->ep0_trb_addr);
|
|
}
|
|
|
|
int dwc3_gadget_suspend(struct dwc3 *dwc)
|
|
{
|
|
if (!dwc->gadget_driver)
|
|
return 0;
|
|
|
|
dwc3_gadget_run_stop(dwc, false, false);
|
|
dwc3_disconnect_gadget(dwc);
|
|
__dwc3_gadget_stop(dwc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dwc3_gadget_resume(struct dwc3 *dwc)
|
|
{
|
|
int ret;
|
|
|
|
if (!dwc->gadget_driver)
|
|
return 0;
|
|
|
|
ret = __dwc3_gadget_start(dwc);
|
|
if (ret < 0)
|
|
goto err0;
|
|
|
|
ret = dwc3_gadget_run_stop(dwc, true, false);
|
|
if (ret < 0)
|
|
goto err1;
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
__dwc3_gadget_stop(dwc);
|
|
|
|
err0:
|
|
return ret;
|
|
}
|
|
|
|
void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
|
|
{
|
|
if (dwc->pending_events) {
|
|
dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
|
|
dwc->pending_events = false;
|
|
enable_irq(dwc->irq_gadget);
|
|
}
|
|
}
|