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696c8b1282
we will be using a single event buffer and that renders ev_buffs array unnecessary. Let's remove it in favor of a single pointer to a single event buffer. Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2893 lines
70 KiB
C
2893 lines
70 KiB
C
/**
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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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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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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/**
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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
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* return 0 on success or -EINVAL if wrong Test Selector
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* 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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dwc3_trace(trace_dwc3_gadget,
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"link state change request timed out");
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return -ETIMEDOUT;
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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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int i;
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if (req->started) {
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i = 0;
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do {
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dep->busy_slot++;
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/*
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* Skip LINK TRB. We can't use req->trb and check for
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* DWC3_TRBCTL_LINK_TRB because it points the TRB we
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* just completed (not the LINK TRB).
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*/
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if (((dep->busy_slot & DWC3_TRB_MASK) ==
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DWC3_TRB_NUM- 1) &&
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usb_endpoint_xfer_isoc(dep->endpoint.desc))
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dep->busy_slot++;
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} while(++i < req->request.num_mapped_sgs);
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req->started = false;
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}
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list_del(&req->list);
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req->trb = NULL;
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if (req->request.status == -EINPROGRESS)
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req->request.status = status;
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if (dwc->ep0_bounced && dep->number == 0)
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dwc->ep0_bounced = false;
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else
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usb_gadget_unmap_request(&dwc->gadget, &req->request,
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req->direction);
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trace_dwc3_gadget_giveback(req);
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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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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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u32 reg;
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trace_dwc3_gadget_generic_cmd(cmd, param);
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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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dwc3_trace(trace_dwc3_gadget,
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"Command Complete --> %d",
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DWC3_DGCMD_STATUS(reg));
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if (DWC3_DGCMD_STATUS(reg))
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return -EINVAL;
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return 0;
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}
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/*
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* We can't sleep here, because it's also called from
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* interrupt context.
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*/
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timeout--;
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if (!timeout) {
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dwc3_trace(trace_dwc3_gadget,
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"Command Timed Out");
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return -ETIMEDOUT;
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}
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udelay(1);
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} while (1);
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}
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int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
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unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
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{
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struct dwc3_ep *dep = dwc->eps[ep];
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u32 timeout = 500;
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u32 reg;
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trace_dwc3_gadget_ep_cmd(dep, cmd, params);
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dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
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dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
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dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
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dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
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do {
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reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
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if (!(reg & DWC3_DEPCMD_CMDACT)) {
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dwc3_trace(trace_dwc3_gadget,
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"Command Complete --> %d",
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DWC3_DEPCMD_STATUS(reg));
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if (DWC3_DEPCMD_STATUS(reg))
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return -EINVAL;
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return 0;
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}
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/*
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* We can't sleep here, because it is also called from
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* interrupt context.
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*/
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timeout--;
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if (!timeout) {
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dwc3_trace(trace_dwc3_gadget,
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"Command Timed Out");
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return -ETIMEDOUT;
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}
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udelay(1);
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} while (1);
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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->dev,
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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->dev, 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 *dwc, struct dwc3_ep *dep);
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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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* The assignment of transfer resources cannot perfectly follow the
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* data book due to the fact that the controller driver does not have
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* all knowledge of the configuration in advance. It is given this
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* information piecemeal by the composite gadget framework after every
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* SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
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* programming model in this scenario can cause errors. For two
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* reasons:
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*
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* 1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION
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* and SET_INTERFACE (8.1.5). This is incorrect in the scenario of
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* multiple interfaces.
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*
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* 2) The databook does not mention doing more DEPXFERCFG for new
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* endpoint on alt setting (8.1.6).
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*
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* The following simplified method is used instead:
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*
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* All hardware endpoints can be assigned a transfer resource and this
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* setting will stay persistent until either a core reset or
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* hibernation. So whenever we do a DEPSTARTCFG(0) we can go ahead and
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* do DEPXFERCFG for every hardware endpoint as well. We are
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* guaranteed that there are as many transfer resources as endpoints.
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*
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* This function is called for each endpoint when it is being enabled
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* but is triggered only when called for EP0-out, which always happens
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* first, and which should only happen in one of the above conditions.
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*/
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static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
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{
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struct dwc3_gadget_ep_cmd_params params;
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u32 cmd;
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int i;
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int ret;
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if (dep->number)
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return 0;
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memset(¶ms, 0x00, sizeof(params));
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cmd = DWC3_DEPCMD_DEPSTARTCFG;
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ret = dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms);
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if (ret)
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return ret;
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for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
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struct dwc3_ep *dep = dwc->eps[i];
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if (!dep)
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continue;
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ret = dwc3_gadget_set_xfer_resource(dwc, dep);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
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const struct usb_endpoint_descriptor *desc,
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const struct usb_ss_ep_comp_descriptor *comp_desc,
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bool ignore, bool restore)
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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_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
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| DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
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/* Burst size is only needed in SuperSpeed mode */
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if (dwc->gadget.speed >= USB_SPEED_SUPER) {
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u32 burst = dep->endpoint.maxburst - 1;
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params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
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}
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if (ignore)
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params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
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if (restore) {
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params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
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params.param2 |= dep->saved_state;
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}
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params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
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| DWC3_DEPCFG_XFER_NOT_READY_EN;
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if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
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params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
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| DWC3_DEPCFG_STREAM_EVENT_EN;
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dep->stream_capable = true;
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}
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|
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if (!usb_endpoint_xfer_control(desc))
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params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
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/*
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* We are doing 1:1 mapping for endpoints, meaning
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* Physical Endpoints 2 maps to Logical Endpoint 2 and
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* so on. We consider the direction bit as part of the physical
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* endpoint number. So USB endpoint 0x81 is 0x03.
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*/
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params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
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|
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/*
|
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* We must use the lower 16 TX FIFOs even though
|
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* HW might have more
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*/
|
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if (dep->direction)
|
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params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
|
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|
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if (desc->bInterval) {
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params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
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dep->interval = 1 << (desc->bInterval - 1);
|
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}
|
|
|
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return dwc3_send_gadget_ep_cmd(dwc, dep->number,
|
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DWC3_DEPCMD_SETEPCONFIG, ¶ms);
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}
|
|
|
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static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
|
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{
|
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struct dwc3_gadget_ep_cmd_params params;
|
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|
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memset(¶ms, 0x00, sizeof(params));
|
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|
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params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
|
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|
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return dwc3_send_gadget_ep_cmd(dwc, dep->number,
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DWC3_DEPCMD_SETTRANSFRESOURCE, ¶ms);
|
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}
|
|
|
|
/**
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* __dwc3_gadget_ep_enable - Initializes a HW endpoint
|
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* @dep: endpoint to be initialized
|
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* @desc: USB Endpoint Descriptor
|
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*
|
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* Caller should take care of locking
|
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*/
|
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static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
|
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const struct usb_endpoint_descriptor *desc,
|
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const struct usb_ss_ep_comp_descriptor *comp_desc,
|
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bool ignore, bool restore)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
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u32 reg;
|
|
int ret;
|
|
|
|
dwc3_trace(trace_dwc3_gadget, "Enabling %s", dep->name);
|
|
|
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if (!(dep->flags & DWC3_EP_ENABLED)) {
|
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ret = dwc3_gadget_start_config(dwc, dep);
|
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if (ret)
|
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return ret;
|
|
}
|
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|
|
ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore,
|
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restore);
|
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if (ret)
|
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return ret;
|
|
|
|
if (!(dep->flags & DWC3_EP_ENABLED)) {
|
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struct dwc3_trb *trb_st_hw;
|
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struct dwc3_trb *trb_link;
|
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|
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dep->endpoint.desc = desc;
|
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dep->comp_desc = comp_desc;
|
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dep->type = usb_endpoint_type(desc);
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dep->flags |= DWC3_EP_ENABLED;
|
|
|
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reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
|
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reg |= DWC3_DALEPENA_EP(dep->number);
|
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dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
|
|
|
|
if (!usb_endpoint_xfer_isoc(desc))
|
|
goto out;
|
|
|
|
/* Link TRB for ISOC. The HWO bit is never reset */
|
|
trb_st_hw = &dep->trb_pool[0];
|
|
|
|
trb_link = &dep->trb_pool[DWC3_TRB_NUM - 1];
|
|
memset(trb_link, 0, sizeof(*trb_link));
|
|
|
|
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;
|
|
}
|
|
|
|
out:
|
|
switch (usb_endpoint_type(desc)) {
|
|
case USB_ENDPOINT_XFER_CONTROL:
|
|
/* don't change name */
|
|
break;
|
|
case USB_ENDPOINT_XFER_ISOC:
|
|
strlcat(dep->name, "-isoc", sizeof(dep->name));
|
|
break;
|
|
case USB_ENDPOINT_XFER_BULK:
|
|
strlcat(dep->name, "-bulk", sizeof(dep->name));
|
|
break;
|
|
case USB_ENDPOINT_XFER_INT:
|
|
strlcat(dep->name, "-int", sizeof(dep->name));
|
|
break;
|
|
default:
|
|
dev_err(dwc->dev, "invalid endpoint transfer type\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force);
|
|
static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3_request *req;
|
|
|
|
if (!list_empty(&dep->started_list)) {
|
|
dwc3_stop_active_transfer(dwc, dep->number, 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 also removes requests which are currently processed ny 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;
|
|
|
|
dwc3_trace(trace_dwc3_gadget, "Disabling %s", dep->name);
|
|
|
|
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->endpoint.desc = NULL;
|
|
dep->comp_desc = NULL;
|
|
dep->type = 0;
|
|
dep->flags = 0;
|
|
|
|
snprintf(dep->name, sizeof(dep->name), "ep%d%s",
|
|
dep->number >> 1,
|
|
(dep->number & 1) ? "in" : "out");
|
|
|
|
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, desc, ep->comp_desc, false, false);
|
|
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_prepare_one_trb - setup one TRB from one request
|
|
* @dep: endpoint for which this request is prepared
|
|
* @req: dwc3_request pointer
|
|
*/
|
|
static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
|
|
struct dwc3_request *req, dma_addr_t dma,
|
|
unsigned length, unsigned last, unsigned chain, unsigned node)
|
|
{
|
|
struct dwc3_trb *trb;
|
|
|
|
dwc3_trace(trace_dwc3_gadget, "%s: req %p dma %08llx length %d%s%s",
|
|
dep->name, req, (unsigned long long) dma,
|
|
length, last ? " last" : "",
|
|
chain ? " chain" : "");
|
|
|
|
|
|
trb = &dep->trb_pool[dep->free_slot & DWC3_TRB_MASK];
|
|
|
|
if (!req->trb) {
|
|
dwc3_gadget_move_started_request(req);
|
|
req->trb = trb;
|
|
req->trb_dma = dwc3_trb_dma_offset(dep, trb);
|
|
req->start_slot = dep->free_slot & DWC3_TRB_MASK;
|
|
}
|
|
|
|
dep->free_slot++;
|
|
/* Skip the LINK-TRB on ISOC */
|
|
if (((dep->free_slot & DWC3_TRB_MASK) == DWC3_TRB_NUM - 1) &&
|
|
usb_endpoint_xfer_isoc(dep->endpoint.desc))
|
|
dep->free_slot++;
|
|
|
|
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;
|
|
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 :)
|
|
*/
|
|
BUG();
|
|
}
|
|
|
|
/* always enable Continue on Short Packet */
|
|
trb->ctrl |= DWC3_TRB_CTRL_CSP;
|
|
|
|
if (!req->request.no_interrupt)
|
|
trb->ctrl |= DWC3_TRB_CTRL_IOC | DWC3_TRB_CTRL_ISP_IMI;
|
|
|
|
if (last)
|
|
trb->ctrl |= DWC3_TRB_CTRL_LST;
|
|
|
|
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(req->request.stream_id);
|
|
|
|
trb->ctrl |= DWC3_TRB_CTRL_HWO;
|
|
|
|
trace_dwc3_prepare_trb(dep, trb);
|
|
}
|
|
|
|
/*
|
|
* dwc3_prepare_trbs - setup TRBs from requests
|
|
* @dep: endpoint for which requests are being prepared
|
|
* @starting: true if the endpoint is idle and no requests are queued.
|
|
*
|
|
* 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, bool starting)
|
|
{
|
|
struct dwc3_request *req, *n;
|
|
u32 trbs_left;
|
|
u32 max;
|
|
unsigned int last_one = 0;
|
|
|
|
BUILD_BUG_ON_NOT_POWER_OF_2(DWC3_TRB_NUM);
|
|
|
|
/* the first request must not be queued */
|
|
trbs_left = (dep->busy_slot - dep->free_slot) & DWC3_TRB_MASK;
|
|
|
|
/* Can't wrap around on a non-isoc EP since there's no link TRB */
|
|
if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
|
|
max = DWC3_TRB_NUM - (dep->free_slot & DWC3_TRB_MASK);
|
|
if (trbs_left > max)
|
|
trbs_left = max;
|
|
}
|
|
|
|
/*
|
|
* If busy & slot are equal than it is either full or empty. If we are
|
|
* starting to process requests then we are empty. Otherwise we are
|
|
* full and don't do anything
|
|
*/
|
|
if (!trbs_left) {
|
|
if (!starting)
|
|
return;
|
|
trbs_left = DWC3_TRB_NUM;
|
|
/*
|
|
* In case we start from scratch, we queue the ISOC requests
|
|
* starting from slot 1. This is done because we use ring
|
|
* buffer and have no LST bit to stop us. Instead, we place
|
|
* IOC bit every TRB_NUM/4. We try to avoid having an interrupt
|
|
* after the first request so we start at slot 1 and have
|
|
* 7 requests proceed before we hit the first IOC.
|
|
* Other transfer types don't use the ring buffer and are
|
|
* processed from the first TRB until the last one. Since we
|
|
* don't wrap around we have to start at the beginning.
|
|
*/
|
|
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
|
|
dep->busy_slot = 1;
|
|
dep->free_slot = 1;
|
|
} else {
|
|
dep->busy_slot = 0;
|
|
dep->free_slot = 0;
|
|
}
|
|
}
|
|
|
|
/* The last TRB is a link TRB, not used for xfer */
|
|
if ((trbs_left <= 1) && usb_endpoint_xfer_isoc(dep->endpoint.desc))
|
|
return;
|
|
|
|
list_for_each_entry_safe(req, n, &dep->pending_list, list) {
|
|
unsigned length;
|
|
dma_addr_t dma;
|
|
last_one = false;
|
|
|
|
if (req->request.num_mapped_sgs > 0) {
|
|
struct usb_request *request = &req->request;
|
|
struct scatterlist *sg = request->sg;
|
|
struct scatterlist *s;
|
|
int i;
|
|
|
|
for_each_sg(sg, s, request->num_mapped_sgs, i) {
|
|
unsigned chain = true;
|
|
|
|
length = sg_dma_len(s);
|
|
dma = sg_dma_address(s);
|
|
|
|
if (i == (request->num_mapped_sgs - 1) ||
|
|
sg_is_last(s)) {
|
|
if (list_empty(&dep->pending_list))
|
|
last_one = true;
|
|
chain = false;
|
|
}
|
|
|
|
trbs_left--;
|
|
if (!trbs_left)
|
|
last_one = true;
|
|
|
|
if (last_one)
|
|
chain = false;
|
|
|
|
dwc3_prepare_one_trb(dep, req, dma, length,
|
|
last_one, chain, i);
|
|
|
|
if (last_one)
|
|
break;
|
|
}
|
|
|
|
if (last_one)
|
|
break;
|
|
} else {
|
|
dma = req->request.dma;
|
|
length = req->request.length;
|
|
trbs_left--;
|
|
|
|
if (!trbs_left)
|
|
last_one = 1;
|
|
|
|
/* Is this the last request? */
|
|
if (list_is_last(&req->list, &dep->pending_list))
|
|
last_one = 1;
|
|
|
|
dwc3_prepare_one_trb(dep, req, dma, length,
|
|
last_one, false, 0);
|
|
|
|
if (last_one)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param,
|
|
int start_new)
|
|
{
|
|
struct dwc3_gadget_ep_cmd_params params;
|
|
struct dwc3_request *req;
|
|
struct dwc3 *dwc = dep->dwc;
|
|
int ret;
|
|
u32 cmd;
|
|
|
|
if (start_new && (dep->flags & DWC3_EP_BUSY)) {
|
|
dwc3_trace(trace_dwc3_gadget, "%s: endpoint busy", dep->name);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/*
|
|
* If we are getting here after a short-out-packet we don't enqueue any
|
|
* new requests as we try to set the IOC bit only on the last request.
|
|
*/
|
|
if (start_new) {
|
|
if (list_empty(&dep->started_list))
|
|
dwc3_prepare_trbs(dep, start_new);
|
|
|
|
/* req points to the first request which will be sent */
|
|
req = next_request(&dep->started_list);
|
|
} else {
|
|
dwc3_prepare_trbs(dep, start_new);
|
|
|
|
/*
|
|
* req points to the first request where HWO changed from 0 to 1
|
|
*/
|
|
req = next_request(&dep->started_list);
|
|
}
|
|
if (!req) {
|
|
dep->flags |= DWC3_EP_PENDING_REQUEST;
|
|
return 0;
|
|
}
|
|
|
|
memset(¶ms, 0, sizeof(params));
|
|
|
|
if (start_new) {
|
|
params.param0 = upper_32_bits(req->trb_dma);
|
|
params.param1 = lower_32_bits(req->trb_dma);
|
|
cmd = DWC3_DEPCMD_STARTTRANSFER;
|
|
} else {
|
|
cmd = DWC3_DEPCMD_UPDATETRANSFER;
|
|
}
|
|
|
|
cmd |= DWC3_DEPCMD_PARAM(cmd_param);
|
|
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, 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.
|
|
*/
|
|
usb_gadget_unmap_request(&dwc->gadget, &req->request,
|
|
req->direction);
|
|
list_del(&req->list);
|
|
return ret;
|
|
}
|
|
|
|
dep->flags |= DWC3_EP_BUSY;
|
|
|
|
if (start_new) {
|
|
dep->resource_index = dwc3_gadget_ep_get_transfer_index(dwc,
|
|
dep->number);
|
|
WARN_ON_ONCE(!dep->resource_index);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
|
|
struct dwc3_ep *dep, u32 cur_uf)
|
|
{
|
|
u32 uf;
|
|
|
|
if (list_empty(&dep->pending_list)) {
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"ISOC ep %s run out for requests",
|
|
dep->name);
|
|
dep->flags |= DWC3_EP_PENDING_REQUEST;
|
|
return;
|
|
}
|
|
|
|
/* 4 micro frames in the future */
|
|
uf = cur_uf + dep->interval * 4;
|
|
|
|
__dwc3_gadget_kick_transfer(dep, uf, 1);
|
|
}
|
|
|
|
static void dwc3_gadget_start_isoc(struct dwc3 *dwc,
|
|
struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
|
|
{
|
|
u32 cur_uf, mask;
|
|
|
|
mask = ~(dep->interval - 1);
|
|
cur_uf = event->parameters & mask;
|
|
|
|
__dwc3_gadget_start_isoc(dwc, dep, cur_uf);
|
|
}
|
|
|
|
static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
|
|
{
|
|
struct dwc3 *dwc = dep->dwc;
|
|
int ret;
|
|
|
|
if (!dep->endpoint.desc) {
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"trying to queue request %p to disabled %s\n",
|
|
&req->request, dep->endpoint.name);
|
|
return -ESHUTDOWN;
|
|
}
|
|
|
|
if (WARN(req->dep != dep, "request %p belongs to '%s'\n",
|
|
&req->request, req->dep->name)) {
|
|
dwc3_trace(trace_dwc3_gadget, "request %p belongs to '%s'\n",
|
|
&req->request, req->dep->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
req->request.actual = 0;
|
|
req->request.status = -EINPROGRESS;
|
|
req->direction = dep->direction;
|
|
req->epnum = dep->number;
|
|
|
|
trace_dwc3_ep_queue(req);
|
|
|
|
/*
|
|
* We only add to our list of requests now and
|
|
* start consuming the list once we get XferNotReady
|
|
* IRQ.
|
|
*
|
|
* That way, we avoid doing anything that we don't need
|
|
* to do now and defer it until the point we receive a
|
|
* particular token from the Host side.
|
|
*
|
|
* This will also avoid Host cancelling URBs due to too
|
|
* many NAKs.
|
|
*/
|
|
ret = usb_gadget_map_request(&dwc->gadget, &req->request,
|
|
dep->direction);
|
|
if (ret)
|
|
return ret;
|
|
|
|
list_add_tail(&req->list, &dep->pending_list);
|
|
|
|
/*
|
|
* If there are no pending requests and the endpoint isn't already
|
|
* busy, we will just start the request straight away.
|
|
*
|
|
* This will save one IRQ (XFER_NOT_READY) and possibly make it a
|
|
* little bit faster.
|
|
*/
|
|
if (!usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
|
|
!usb_endpoint_xfer_int(dep->endpoint.desc) &&
|
|
!(dep->flags & DWC3_EP_BUSY)) {
|
|
ret = __dwc3_gadget_kick_transfer(dep, 0, true);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* There are a few special cases:
|
|
*
|
|
* 1. XferNotReady with empty list of requests. We need to kick the
|
|
* transfer here in that situation, otherwise we will be NAKing
|
|
* forever. If we get XferNotReady before gadget driver has a
|
|
* chance to queue a request, we will ACK the IRQ but won't be
|
|
* able to receive the data until the next request is queued.
|
|
* The following code is handling exactly that.
|
|
*
|
|
*/
|
|
if (dep->flags & DWC3_EP_PENDING_REQUEST) {
|
|
/*
|
|
* If xfernotready is already elapsed and it is a case
|
|
* of isoc transfer, then issue END TRANSFER, so that
|
|
* you can receive xfernotready again and can have
|
|
* notion of current microframe.
|
|
*/
|
|
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
|
|
if (list_empty(&dep->started_list)) {
|
|
dwc3_stop_active_transfer(dwc, dep->number, true);
|
|
dep->flags = DWC3_EP_ENABLED;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
ret = __dwc3_gadget_kick_transfer(dep, 0, true);
|
|
if (!ret)
|
|
dep->flags &= ~DWC3_EP_PENDING_REQUEST;
|
|
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 2. XferInProgress on Isoc EP with an active transfer. We need to
|
|
* kick the transfer here after queuing a request, otherwise the
|
|
* core may not see the modified TRB(s).
|
|
*/
|
|
if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
|
|
(dep->flags & DWC3_EP_BUSY) &&
|
|
!(dep->flags & DWC3_EP_MISSED_ISOC)) {
|
|
WARN_ON_ONCE(!dep->resource_index);
|
|
ret = __dwc3_gadget_kick_transfer(dep, dep->resource_index,
|
|
false);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 4. Stream Capable Bulk Endpoints. We need to start the transfer
|
|
* right away, otherwise host will not know we have streams to be
|
|
* handled.
|
|
*/
|
|
if (dep->stream_capable)
|
|
ret = __dwc3_gadget_kick_transfer(dep, 0, true);
|
|
|
|
out:
|
|
if (ret && ret != -EBUSY)
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"%s: failed to kick transfers\n",
|
|
dep->name);
|
|
if (ret == -EBUSY)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __dwc3_gadget_ep_zlp_complete(struct usb_ep *ep,
|
|
struct usb_request *request)
|
|
{
|
|
dwc3_gadget_ep_free_request(ep, request);
|
|
}
|
|
|
|
static int __dwc3_gadget_ep_queue_zlp(struct dwc3 *dwc, struct dwc3_ep *dep)
|
|
{
|
|
struct dwc3_request *req;
|
|
struct usb_request *request;
|
|
struct usb_ep *ep = &dep->endpoint;
|
|
|
|
dwc3_trace(trace_dwc3_gadget, "queueing ZLP\n");
|
|
request = dwc3_gadget_ep_alloc_request(ep, GFP_ATOMIC);
|
|
if (!request)
|
|
return -ENOMEM;
|
|
|
|
request->length = 0;
|
|
request->buf = dwc->zlp_buf;
|
|
request->complete = __dwc3_gadget_ep_zlp_complete;
|
|
|
|
req = to_dwc3_request(request);
|
|
|
|
return __dwc3_gadget_ep_queue(dep, req);
|
|
}
|
|
|
|
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);
|
|
|
|
/*
|
|
* Okay, here's the thing, if gadget driver has requested for a ZLP by
|
|
* setting request->zero, instead of doing magic, we will just queue an
|
|
* extra usb_request ourselves so that it gets handled the same way as
|
|
* any other request.
|
|
*/
|
|
if (ret == 0 && request->zero && request->length &&
|
|
(request->length % ep->maxpacket == 0))
|
|
ret = __dwc3_gadget_ep_queue_zlp(dwc, dep);
|
|
|
|
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(dwc, dep->number, true);
|
|
goto out1;
|
|
}
|
|
dev_err(dwc->dev, "request %p 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) {
|
|
if (!protocol && ((dep->direction && dep->flags & DWC3_EP_BUSY) ||
|
|
(!list_empty(&dep->started_list) ||
|
|
!list_empty(&dep->pending_list)))) {
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"%s: pending request, cannot halt\n",
|
|
dep->name);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
|
|
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 {
|
|
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
|
|
DWC3_DEPCMD_CLEARSTALL, ¶ms);
|
|
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);
|
|
u32 reg;
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
|
|
return DWC3_DSTS_SOFFN(reg);
|
|
}
|
|
|
|
static int dwc3_gadget_wakeup(struct usb_gadget *g)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
|
|
unsigned long timeout;
|
|
unsigned long flags;
|
|
|
|
u32 reg;
|
|
|
|
int ret = 0;
|
|
|
|
u8 link_state;
|
|
u8 speed;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
|
|
/*
|
|
* 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)) {
|
|
dwc3_trace(trace_dwc3_gadget, "no wakeup on SuperSpeed\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
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:
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"can't wakeup from '%s'\n",
|
|
dwc3_gadget_link_string(link_state));
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
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");
|
|
goto out;
|
|
}
|
|
|
|
/* 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 */
|
|
timeout = jiffies + msecs_to_jiffies(100);
|
|
|
|
while (!time_after(jiffies, timeout)) {
|
|
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");
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
out:
|
|
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;
|
|
|
|
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);
|
|
if (is_on) {
|
|
if (!(reg & DWC3_DSTS_DEVCTRLHLT))
|
|
break;
|
|
} else {
|
|
if (reg & DWC3_DSTS_DEVCTRLHLT)
|
|
break;
|
|
}
|
|
timeout--;
|
|
if (!timeout)
|
|
return -ETIMEDOUT;
|
|
udelay(1);
|
|
} while (1);
|
|
|
|
dwc3_trace(trace_dwc3_gadget, "gadget %s data soft-%s",
|
|
dwc->gadget_driver
|
|
? dwc->gadget_driver->function : "no-function",
|
|
is_on ? "connect" : "disconnect");
|
|
|
|
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;
|
|
|
|
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_ULSTCNGEN |
|
|
DWC3_DEVTEN_CONNECTDONEEN |
|
|
DWC3_DEVTEN_USBRSTEN |
|
|
DWC3_DEVTEN_DISCONNEVTEN);
|
|
|
|
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);
|
|
|
|
static int dwc3_gadget_start(struct usb_gadget *g,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
struct dwc3_ep *dep;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
int irq;
|
|
u32 reg;
|
|
|
|
irq = platform_get_irq(to_platform_device(dwc->dev), 0);
|
|
ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
|
|
IRQF_SHARED, "dwc3", dwc);
|
|
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;
|
|
|
|
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) {
|
|
reg |= DWC3_DCFG_SUPERSPEED;
|
|
} else {
|
|
switch (dwc->maximum_speed) {
|
|
case USB_SPEED_LOW:
|
|
reg |= DWC3_DSTS_LOWSPEED;
|
|
break;
|
|
case USB_SPEED_FULL:
|
|
reg |= DWC3_DSTS_FULLSPEED1;
|
|
break;
|
|
case USB_SPEED_HIGH:
|
|
reg |= DWC3_DSTS_HIGHSPEED;
|
|
break;
|
|
case USB_SPEED_SUPER_PLUS:
|
|
reg |= DWC3_DSTS_SUPERSPEED_PLUS;
|
|
break;
|
|
default:
|
|
dev_err(dwc->dev, "invalid dwc->maximum_speed (%d)\n",
|
|
dwc->maximum_speed);
|
|
/* fall through */
|
|
case USB_SPEED_SUPER:
|
|
reg |= DWC3_DCFG_SUPERSPEED;
|
|
break;
|
|
}
|
|
}
|
|
dwc3_writel(dwc->regs, DWC3_DCFG, reg);
|
|
|
|
/* Start with SuperSpeed Default */
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
|
|
|
|
dep = dwc->eps[0];
|
|
ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
|
|
false);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
|
|
goto err2;
|
|
}
|
|
|
|
dep = dwc->eps[1];
|
|
ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
|
|
false);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to enable %s\n", dep->name);
|
|
goto err3;
|
|
}
|
|
|
|
/* begin to receive SETUP packets */
|
|
dwc->ep0state = EP0_SETUP_PHASE;
|
|
dwc3_ep0_out_start(dwc);
|
|
|
|
dwc3_gadget_enable_irq(dwc);
|
|
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return 0;
|
|
|
|
err3:
|
|
__dwc3_gadget_ep_disable(dwc->eps[0]);
|
|
|
|
err2:
|
|
dwc->gadget_driver = NULL;
|
|
|
|
err1:
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
free_irq(irq, dwc);
|
|
|
|
err0:
|
|
return ret;
|
|
}
|
|
|
|
static int dwc3_gadget_stop(struct usb_gadget *g)
|
|
{
|
|
struct dwc3 *dwc = gadget_to_dwc(g);
|
|
unsigned long flags;
|
|
int irq;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
|
|
dwc3_gadget_disable_irq(dwc);
|
|
__dwc3_gadget_ep_disable(dwc->eps[0]);
|
|
__dwc3_gadget_ep_disable(dwc->eps[1]);
|
|
|
|
dwc->gadget_driver = NULL;
|
|
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
irq = platform_get_irq(to_platform_device(dwc->dev), 0);
|
|
free_irq(irq, dwc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
|
|
u8 num, u32 direction)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
u8 i;
|
|
|
|
for (i = 0; i < num; i++) {
|
|
u8 epnum = (i << 1) | (!!direction);
|
|
|
|
dep = kzalloc(sizeof(*dep), GFP_KERNEL);
|
|
if (!dep)
|
|
return -ENOMEM;
|
|
|
|
dep->dwc = dwc;
|
|
dep->number = epnum;
|
|
dep->direction = !!direction;
|
|
dwc->eps[epnum] = dep;
|
|
|
|
snprintf(dep->name, sizeof(dep->name), "ep%d%s", epnum >> 1,
|
|
(epnum & 1) ? "in" : "out");
|
|
|
|
dep->endpoint.name = dep->name;
|
|
|
|
dwc3_trace(trace_dwc3_gadget, "initializing %s", dep->name);
|
|
|
|
if (epnum == 0 || epnum == 1) {
|
|
usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
|
|
dep->endpoint.maxburst = 1;
|
|
dep->endpoint.ops = &dwc3_gadget_ep0_ops;
|
|
if (!epnum)
|
|
dwc->gadget.ep0 = &dep->endpoint;
|
|
} else {
|
|
int ret;
|
|
|
|
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);
|
|
|
|
ret = dwc3_alloc_trb_pool(dep);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (epnum == 0 || epnum == 1) {
|
|
dep->endpoint.caps.type_control = true;
|
|
} else {
|
|
dep->endpoint.caps.type_iso = true;
|
|
dep->endpoint.caps.type_bulk = true;
|
|
dep->endpoint.caps.type_int = true;
|
|
}
|
|
|
|
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)
|
|
{
|
|
int ret;
|
|
|
|
INIT_LIST_HEAD(&dwc->gadget.ep_list);
|
|
|
|
ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_out_eps, 0);
|
|
if (ret < 0) {
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"failed to allocate OUT endpoints");
|
|
return ret;
|
|
}
|
|
|
|
ret = dwc3_gadget_init_hw_endpoints(dwc, dwc->num_in_eps, 1);
|
|
if (ret < 0) {
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"failed to allocate IN endpoints");
|
|
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_cleanup_done_trbs(struct dwc3 *dwc, struct dwc3_ep *dep,
|
|
struct dwc3_request *req, struct dwc3_trb *trb,
|
|
const struct dwc3_event_depevt *event, int status)
|
|
{
|
|
unsigned int count;
|
|
unsigned int s_pkt = 0;
|
|
unsigned int trb_status;
|
|
|
|
trace_dwc3_complete_trb(dep, trb);
|
|
|
|
if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
|
|
/*
|
|
* We continue despite the error. There is not much we
|
|
* can do. If we don't clean it up we loop forever. If
|
|
* we skip the TRB then it gets overwritten after a
|
|
* while since we use them in a ring buffer. A BUG()
|
|
* would help. Lets hope that if this occurs, someone
|
|
* fixes the root cause instead of looking away :)
|
|
*/
|
|
dev_err(dwc->dev, "%s's TRB (%p) still owned by HW\n",
|
|
dep->name, trb);
|
|
count = trb->size & DWC3_TRB_SIZE_MASK;
|
|
|
|
if (dep->direction) {
|
|
if (count) {
|
|
trb_status = DWC3_TRB_SIZE_TRBSTS(trb->size);
|
|
if (trb_status == DWC3_TRBSTS_MISSED_ISOC) {
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"%s: incomplete IN transfer\n",
|
|
dep->name);
|
|
/*
|
|
* If missed isoc occurred and there is
|
|
* no request queued then issue END
|
|
* TRANSFER, so that core generates
|
|
* next xfernotready and we will issue
|
|
* a fresh START TRANSFER.
|
|
* If there are still queued request
|
|
* then wait, do not issue either END
|
|
* or UPDATE TRANSFER, just attach next
|
|
* request in pending_list during
|
|
* giveback.If any future queued request
|
|
* is successfully transferred then we
|
|
* will issue UPDATE TRANSFER for all
|
|
* request in the pending_list.
|
|
*/
|
|
dep->flags |= DWC3_EP_MISSED_ISOC;
|
|
} else {
|
|
dev_err(dwc->dev, "incomplete IN transfer %s\n",
|
|
dep->name);
|
|
status = -ECONNRESET;
|
|
}
|
|
} else {
|
|
dep->flags &= ~DWC3_EP_MISSED_ISOC;
|
|
}
|
|
} else {
|
|
if (count && (event->status & DEPEVT_STATUS_SHORT))
|
|
s_pkt = 1;
|
|
}
|
|
|
|
/*
|
|
* We assume here we will always receive the entire data block
|
|
* which we should receive. Meaning, if we program RX to
|
|
* receive 4K but we receive only 2K, we assume that's all we
|
|
* should receive and we simply bounce the request back to the
|
|
* gadget driver for further processing.
|
|
*/
|
|
req->request.actual += req->request.length - count;
|
|
if (s_pkt)
|
|
return 1;
|
|
if ((event->status & DEPEVT_STATUS_LST) &&
|
|
(trb->ctrl & (DWC3_TRB_CTRL_LST |
|
|
DWC3_TRB_CTRL_HWO)))
|
|
return 1;
|
|
if ((event->status & DEPEVT_STATUS_IOC) &&
|
|
(trb->ctrl & DWC3_TRB_CTRL_IOC))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
|
|
const struct dwc3_event_depevt *event, int status)
|
|
{
|
|
struct dwc3_request *req;
|
|
struct dwc3_trb *trb;
|
|
unsigned int slot;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
do {
|
|
req = next_request(&dep->started_list);
|
|
if (WARN_ON_ONCE(!req))
|
|
return 1;
|
|
|
|
i = 0;
|
|
do {
|
|
slot = req->start_slot + i;
|
|
if ((slot == DWC3_TRB_NUM - 1) &&
|
|
usb_endpoint_xfer_isoc(dep->endpoint.desc))
|
|
slot++;
|
|
slot %= DWC3_TRB_NUM;
|
|
trb = &dep->trb_pool[slot];
|
|
|
|
ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
|
|
event, status);
|
|
if (ret)
|
|
break;
|
|
} while (++i < req->request.num_mapped_sgs);
|
|
|
|
dwc3_gadget_giveback(dep, req, status);
|
|
|
|
if (ret)
|
|
break;
|
|
} while (1);
|
|
|
|
if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
|
|
list_empty(&dep->started_list)) {
|
|
if (list_empty(&dep->pending_list)) {
|
|
/*
|
|
* If there is no entry in request list then do
|
|
* not issue END TRANSFER now. Just set PENDING
|
|
* flag, so that END TRANSFER is issued when an
|
|
* entry is added into request list.
|
|
*/
|
|
dep->flags = DWC3_EP_PENDING_REQUEST;
|
|
} else {
|
|
dwc3_stop_active_transfer(dwc, dep->number, true);
|
|
dep->flags = DWC3_EP_ENABLED;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc,
|
|
struct dwc3_ep *dep, const struct dwc3_event_depevt *event)
|
|
{
|
|
unsigned status = 0;
|
|
int clean_busy;
|
|
u32 is_xfer_complete;
|
|
|
|
is_xfer_complete = (event->endpoint_event == DWC3_DEPEVT_XFERCOMPLETE);
|
|
|
|
if (event->status & DEPEVT_STATUS_BUSERR)
|
|
status = -ECONNRESET;
|
|
|
|
clean_busy = dwc3_cleanup_done_reqs(dwc, dep, event, status);
|
|
if (clean_busy && (is_xfer_complete ||
|
|
usb_endpoint_xfer_isoc(dep->endpoint.desc)))
|
|
dep->flags &= ~DWC3_EP_BUSY;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
if (!usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
|
|
int ret;
|
|
|
|
ret = __dwc3_gadget_kick_transfer(dep, 0, is_xfer_complete);
|
|
if (!ret || ret == -EBUSY)
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
|
|
const struct dwc3_event_depevt *event)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
u8 epnum = event->endpoint_number;
|
|
|
|
dep = dwc->eps[epnum];
|
|
|
|
if (!(dep->flags & DWC3_EP_ENABLED))
|
|
return;
|
|
|
|
if (epnum == 0 || epnum == 1) {
|
|
dwc3_ep0_interrupt(dwc, event);
|
|
return;
|
|
}
|
|
|
|
switch (event->endpoint_event) {
|
|
case DWC3_DEPEVT_XFERCOMPLETE:
|
|
dep->resource_index = 0;
|
|
|
|
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"%s is an Isochronous endpoint\n",
|
|
dep->name);
|
|
return;
|
|
}
|
|
|
|
dwc3_endpoint_transfer_complete(dwc, dep, event);
|
|
break;
|
|
case DWC3_DEPEVT_XFERINPROGRESS:
|
|
dwc3_endpoint_transfer_complete(dwc, dep, event);
|
|
break;
|
|
case DWC3_DEPEVT_XFERNOTREADY:
|
|
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
|
|
dwc3_gadget_start_isoc(dwc, dep, event);
|
|
} else {
|
|
int active;
|
|
int ret;
|
|
|
|
active = event->status & DEPEVT_STATUS_TRANSFER_ACTIVE;
|
|
|
|
dwc3_trace(trace_dwc3_gadget, "%s: reason %s",
|
|
dep->name, active ? "Transfer Active"
|
|
: "Transfer Not Active");
|
|
|
|
ret = __dwc3_gadget_kick_transfer(dep, 0, !active);
|
|
if (!ret || ret == -EBUSY)
|
|
return;
|
|
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"%s: failed to kick transfers\n",
|
|
dep->name);
|
|
}
|
|
|
|
break;
|
|
case DWC3_DEPEVT_STREAMEVT:
|
|
if (!usb_endpoint_xfer_bulk(dep->endpoint.desc)) {
|
|
dev_err(dwc->dev, "Stream event for non-Bulk %s\n",
|
|
dep->name);
|
|
return;
|
|
}
|
|
|
|
switch (event->status) {
|
|
case DEPEVT_STREAMEVT_FOUND:
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"Stream %d found and started",
|
|
event->parameters);
|
|
|
|
break;
|
|
case DEPEVT_STREAMEVT_NOTFOUND:
|
|
/* FALLTHROUGH */
|
|
default:
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"unable to find suitable stream\n");
|
|
}
|
|
break;
|
|
case DWC3_DEPEVT_RXTXFIFOEVT:
|
|
dwc3_trace(trace_dwc3_gadget, "%s FIFO Overrun\n", dep->name);
|
|
break;
|
|
case DWC3_DEPEVT_EPCMDCMPLT:
|
|
dwc3_trace(trace_dwc3_gadget, "Endpoint Command Complete");
|
|
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 *dwc, u32 epnum, bool force)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
struct dwc3_gadget_ep_cmd_params params;
|
|
u32 cmd;
|
|
int ret;
|
|
|
|
dep = dwc->eps[epnum];
|
|
|
|
if (!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
|
|
*/
|
|
|
|
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(dwc, dep->number, cmd, ¶ms);
|
|
WARN_ON_ONCE(ret);
|
|
dep->resource_index = 0;
|
|
dep->flags &= ~DWC3_EP_BUSY;
|
|
udelay(100);
|
|
}
|
|
|
|
static void dwc3_stop_active_transfers(struct dwc3 *dwc)
|
|
{
|
|
u32 epnum;
|
|
|
|
for (epnum = 2; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
|
|
struct dwc3_ep *dep;
|
|
|
|
dep = dwc->eps[epnum];
|
|
if (!dep)
|
|
continue;
|
|
|
|
if (!(dep->flags & DWC3_EP_ENABLED))
|
|
continue;
|
|
|
|
dwc3_remove_requests(dwc, dep);
|
|
}
|
|
}
|
|
|
|
static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
|
|
{
|
|
u32 epnum;
|
|
|
|
for (epnum = 1; epnum < DWC3_ENDPOINTS_NUM; epnum++) {
|
|
struct dwc3_ep *dep;
|
|
struct dwc3_gadget_ep_cmd_params params;
|
|
int ret;
|
|
|
|
dep = dwc->eps[epnum];
|
|
if (!dep)
|
|
continue;
|
|
|
|
if (!(dep->flags & DWC3_EP_STALL))
|
|
continue;
|
|
|
|
dep->flags &= ~DWC3_EP_STALL;
|
|
|
|
memset(¶ms, 0, sizeof(params));
|
|
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
|
|
DWC3_DEPCMD_CLEARSTALL, ¶ms);
|
|
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);
|
|
}
|
|
|
|
static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
|
|
{
|
|
u32 reg;
|
|
|
|
/*
|
|
* 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_stop_active_transfers(dwc);
|
|
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_update_ram_clk_sel(struct dwc3 *dwc, u32 speed)
|
|
{
|
|
u32 reg;
|
|
u32 usb30_clock = DWC3_GCTL_CLK_BUS;
|
|
|
|
/*
|
|
* We change the clock only at SS but I dunno why I would want to do
|
|
* this. Maybe it becomes part of the power saving plan.
|
|
*/
|
|
|
|
if ((speed != DWC3_DSTS_SUPERSPEED) &&
|
|
(speed != DWC3_DSTS_SUPERSPEED_PLUS))
|
|
return;
|
|
|
|
/*
|
|
* RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
|
|
* each time on Connect Done.
|
|
*/
|
|
if (!usb30_clock)
|
|
return;
|
|
|
|
reg = dwc3_readl(dwc->regs, DWC3_GCTL);
|
|
reg |= DWC3_GCTL_RAMCLKSEL(usb30_clock);
|
|
dwc3_writel(dwc->regs, DWC3_GCTL, 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;
|
|
|
|
dwc3_update_ram_clk_sel(dwc, speed);
|
|
|
|
switch (speed) {
|
|
case DWC3_DCFG_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_DCFG_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_DCFG_HIGHSPEED:
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
|
|
dwc->gadget.ep0->maxpacket = 64;
|
|
dwc->gadget.speed = USB_SPEED_HIGH;
|
|
break;
|
|
case DWC3_DCFG_FULLSPEED2:
|
|
case DWC3_DCFG_FULLSPEED1:
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
|
|
dwc->gadget.ep0->maxpacket = 64;
|
|
dwc->gadget.speed = USB_SPEED_FULL;
|
|
break;
|
|
case DWC3_DCFG_LOWSPEED:
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(8);
|
|
dwc->gadget.ep0->maxpacket = 8;
|
|
dwc->gadget.speed = USB_SPEED_LOW;
|
|
break;
|
|
}
|
|
|
|
/* Enable USB2 LPM Capability */
|
|
|
|
if ((dwc->revision > DWC3_REVISION_194A) &&
|
|
(speed != DWC3_DCFG_SUPERSPEED) &&
|
|
(speed != DWC3_DCFG_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 revisisions < 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_gadget_ep0_desc, NULL, true,
|
|
false);
|
|
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_gadget_ep0_desc, NULL, true,
|
|
false);
|
|
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)) {
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"ignoring transition U3 -> 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_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:
|
|
dwc3_trace(trace_dwc3_gadget, "End of Periodic Frame");
|
|
break;
|
|
case DWC3_DEVICE_EVENT_SOF:
|
|
dwc3_trace(trace_dwc3_gadget, "Start of Periodic Frame");
|
|
break;
|
|
case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
|
|
dwc3_trace(trace_dwc3_gadget, "Erratic Error");
|
|
break;
|
|
case DWC3_DEVICE_EVENT_CMD_CMPL:
|
|
dwc3_trace(trace_dwc3_gadget, "Command Complete");
|
|
break;
|
|
case DWC3_DEVICE_EVENT_OVERFLOW:
|
|
dwc3_trace(trace_dwc3_gadget, "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);
|
|
|
|
/* Endpoint IRQ, handle it and return early */
|
|
if (event->type.is_devspec == 0) {
|
|
/* depevt */
|
|
return dwc3_endpoint_interrupt(dwc, &event->depevt);
|
|
}
|
|
|
|
switch (event->type.type) {
|
|
case DWC3_EVENT_TYPE_DEV:
|
|
dwc3_gadget_interrupt(dwc, &event->devt);
|
|
break;
|
|
/* REVISIT what to do with Carkit and I2C events ? */
|
|
default:
|
|
dev_err(dwc->dev, "UNKNOWN IRQ type %d\n", event->raw);
|
|
}
|
|
}
|
|
|
|
static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc)
|
|
{
|
|
struct dwc3_event_buffer *evt;
|
|
irqreturn_t ret = IRQ_NONE;
|
|
int left;
|
|
u32 reg;
|
|
|
|
evt = dwc->ev_buf;
|
|
left = evt->count;
|
|
|
|
if (!(evt->flags & DWC3_EVENT_PENDING))
|
|
return IRQ_NONE;
|
|
|
|
while (left > 0) {
|
|
union dwc3_event event;
|
|
|
|
event.raw = *(u32 *) (evt->buf + 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) % DWC3_EVENT_BUFFERS_SIZE;
|
|
left -= 4;
|
|
|
|
dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 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);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc)
|
|
{
|
|
struct dwc3 *dwc = _dwc;
|
|
unsigned long flags;
|
|
irqreturn_t ret = IRQ_NONE;
|
|
|
|
spin_lock_irqsave(&dwc->lock, flags);
|
|
ret = dwc3_process_event_buf(dwc);
|
|
spin_unlock_irqrestore(&dwc->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc)
|
|
{
|
|
struct dwc3_event_buffer *evt;
|
|
u32 count;
|
|
u32 reg;
|
|
|
|
evt = dwc->ev_buf;
|
|
|
|
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);
|
|
|
|
return IRQ_WAKE_THREAD;
|
|
}
|
|
|
|
static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
|
|
{
|
|
struct dwc3 *dwc = _dwc;
|
|
|
|
return dwc3_check_event_buf(dwc);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
|
|
&dwc->ctrl_req_addr, GFP_KERNEL);
|
|
if (!dwc->ctrl_req) {
|
|
dev_err(dwc->dev, "failed to allocate ctrl request\n");
|
|
ret = -ENOMEM;
|
|
goto err0;
|
|
}
|
|
|
|
dwc->ep0_trb = dma_alloc_coherent(dwc->dev, 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 err1;
|
|
}
|
|
|
|
dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
|
|
if (!dwc->setup_buf) {
|
|
ret = -ENOMEM;
|
|
goto err2;
|
|
}
|
|
|
|
dwc->ep0_bounce = dma_alloc_coherent(dwc->dev,
|
|
DWC3_EP0_BOUNCE_SIZE, &dwc->ep0_bounce_addr,
|
|
GFP_KERNEL);
|
|
if (!dwc->ep0_bounce) {
|
|
dev_err(dwc->dev, "failed to allocate ep0 bounce buffer\n");
|
|
ret = -ENOMEM;
|
|
goto err3;
|
|
}
|
|
|
|
dwc->zlp_buf = kzalloc(DWC3_ZLP_BUF_SIZE, GFP_KERNEL);
|
|
if (!dwc->zlp_buf) {
|
|
ret = -ENOMEM;
|
|
goto err4;
|
|
}
|
|
|
|
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)
|
|
dwc3_trace(trace_dwc3_gadget,
|
|
"Changing max_speed on rev %08x\n",
|
|
dwc->revision);
|
|
|
|
dwc->gadget.max_speed = dwc->maximum_speed;
|
|
|
|
/*
|
|
* Per databook, DWC3 needs buffer size to be aligned to MaxPacketSize
|
|
* on ep out.
|
|
*/
|
|
dwc->gadget.quirk_ep_out_aligned_size = true;
|
|
|
|
/*
|
|
* 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);
|
|
if (ret)
|
|
goto err5;
|
|
|
|
ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget);
|
|
if (ret) {
|
|
dev_err(dwc->dev, "failed to register udc\n");
|
|
goto err5;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err5:
|
|
kfree(dwc->zlp_buf);
|
|
|
|
err4:
|
|
dwc3_gadget_free_endpoints(dwc);
|
|
dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE,
|
|
dwc->ep0_bounce, dwc->ep0_bounce_addr);
|
|
|
|
err3:
|
|
kfree(dwc->setup_buf);
|
|
|
|
err2:
|
|
dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
|
|
dwc->ep0_trb, dwc->ep0_trb_addr);
|
|
|
|
err1:
|
|
dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
|
|
dwc->ctrl_req, dwc->ctrl_req_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->dev, DWC3_EP0_BOUNCE_SIZE,
|
|
dwc->ep0_bounce, dwc->ep0_bounce_addr);
|
|
|
|
kfree(dwc->setup_buf);
|
|
kfree(dwc->zlp_buf);
|
|
|
|
dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb),
|
|
dwc->ep0_trb, dwc->ep0_trb_addr);
|
|
|
|
dma_free_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
|
|
dwc->ctrl_req, dwc->ctrl_req_addr);
|
|
}
|
|
|
|
int dwc3_gadget_suspend(struct dwc3 *dwc)
|
|
{
|
|
if (dwc->pullups_connected) {
|
|
dwc3_gadget_disable_irq(dwc);
|
|
dwc3_gadget_run_stop(dwc, true, true);
|
|
}
|
|
|
|
__dwc3_gadget_ep_disable(dwc->eps[0]);
|
|
__dwc3_gadget_ep_disable(dwc->eps[1]);
|
|
|
|
dwc->dcfg = dwc3_readl(dwc->regs, DWC3_DCFG);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dwc3_gadget_resume(struct dwc3 *dwc)
|
|
{
|
|
struct dwc3_ep *dep;
|
|
int ret;
|
|
|
|
/* Start with SuperSpeed Default */
|
|
dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
|
|
|
|
dep = dwc->eps[0];
|
|
ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
|
|
false);
|
|
if (ret)
|
|
goto err0;
|
|
|
|
dep = dwc->eps[1];
|
|
ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false,
|
|
false);
|
|
if (ret)
|
|
goto err1;
|
|
|
|
/* begin to receive SETUP packets */
|
|
dwc->ep0state = EP0_SETUP_PHASE;
|
|
dwc3_ep0_out_start(dwc);
|
|
|
|
dwc3_writel(dwc->regs, DWC3_DCFG, dwc->dcfg);
|
|
|
|
if (dwc->pullups_connected) {
|
|
dwc3_gadget_enable_irq(dwc);
|
|
dwc3_gadget_run_stop(dwc, true, false);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
__dwc3_gadget_ep_disable(dwc->eps[0]);
|
|
|
|
err0:
|
|
return ret;
|
|
}
|