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![Chunfeng Yun](/assets/img/avatar_default.png)
This patch adds support for the MediaTek USB3 DRD controller, its host side is based on xHCI, this driver supports device mode and host mode. Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Acked-by: Bin Meng <bmeng.cn@gmail.com>
687 lines
15 KiB
C
687 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* mtu3_gadget.c - MediaTek usb3 DRD peripheral support
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*
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* Copyright (C) 2016 MediaTek Inc.
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*
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* Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
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*/
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#include "mtu3.h"
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void mtu3_req_complete(struct mtu3_ep *mep,
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struct usb_request *req, int status)
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__releases(mep->mtu->lock)
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__acquires(mep->mtu->lock)
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{
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struct mtu3_request *mreq = to_mtu3_request(req);
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struct mtu3 *mtu = mreq->mtu;
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list_del(&mreq->list);
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if (req->status == -EINPROGRESS)
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req->status = status;
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spin_unlock(&mtu->lock);
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/* ep0 makes use of PIO, needn't unmap it */
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if (mep->epnum)
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usb_gadget_unmap_request(&mtu->g, req, mep->is_in);
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dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n",
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mep->name, req, req->status, req->actual, req->length);
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usb_gadget_giveback_request(&mep->ep, req);
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spin_lock(&mtu->lock);
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}
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static void nuke(struct mtu3_ep *mep, const int status)
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{
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struct mtu3_request *mreq = NULL;
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if (list_empty(&mep->req_list))
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return;
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dev_dbg(mep->mtu->dev, "abort %s's req: sts %d\n", mep->name, status);
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/* exclude EP0 */
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if (mep->epnum)
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mtu3_qmu_flush(mep);
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while (!list_empty(&mep->req_list)) {
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mreq = list_first_entry(&mep->req_list,
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struct mtu3_request, list);
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mtu3_req_complete(mep, &mreq->request, status);
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}
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}
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static int mtu3_ep_enable(struct mtu3_ep *mep)
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{
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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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struct mtu3 *mtu = mep->mtu;
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u32 interval = 0;
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u32 mult = 0;
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u32 burst = 0;
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int max_packet;
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int ret;
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desc = mep->desc;
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comp_desc = mep->comp_desc;
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mep->type = usb_endpoint_type(desc);
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max_packet = usb_endpoint_maxp(desc);
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mep->maxp = max_packet & GENMASK(10, 0);
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switch (mtu->g.speed) {
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case USB_SPEED_SUPER:
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case USB_SPEED_SUPER_PLUS:
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if (usb_endpoint_xfer_int(desc) ||
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usb_endpoint_xfer_isoc(desc)) {
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interval = desc->bInterval;
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interval = clamp_val(interval, 1, 16) - 1;
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if (usb_endpoint_xfer_isoc(desc) && comp_desc)
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mult = comp_desc->bmAttributes;
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}
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if (comp_desc)
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burst = comp_desc->bMaxBurst;
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break;
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case USB_SPEED_HIGH:
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if (usb_endpoint_xfer_isoc(desc) ||
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usb_endpoint_xfer_int(desc)) {
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interval = desc->bInterval;
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interval = clamp_val(interval, 1, 16) - 1;
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burst = (max_packet & GENMASK(12, 11)) >> 11;
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}
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break;
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default:
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break; /*others are ignored */
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}
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dev_dbg(mtu->dev, "%s maxp:%d, interval:%d, burst:%d, mult:%d\n",
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__func__, mep->maxp, interval, burst, mult);
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mep->ep.maxpacket = mep->maxp;
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mep->ep.desc = desc;
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mep->ep.comp_desc = comp_desc;
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mep->slot = mtu->slot;
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ret = mtu3_config_ep(mtu, mep, interval, burst, mult);
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if (ret < 0)
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return ret;
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ret = mtu3_gpd_ring_alloc(mep);
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if (ret < 0) {
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mtu3_deconfig_ep(mtu, mep);
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return ret;
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}
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mtu3_qmu_start(mep);
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return 0;
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}
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static int mtu3_ep_disable(struct mtu3_ep *mep)
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{
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struct mtu3 *mtu = mep->mtu;
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mtu3_qmu_stop(mep);
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/* abort all pending requests */
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nuke(mep, -ESHUTDOWN);
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mtu3_deconfig_ep(mtu, mep);
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mtu3_gpd_ring_free(mep);
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mep->desc = NULL;
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mep->ep.desc = NULL;
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mep->comp_desc = NULL;
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mep->type = 0;
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mep->flags = 0;
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return 0;
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}
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static int mtu3_gadget_ep_enable(struct usb_ep *ep,
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const struct usb_endpoint_descriptor *desc)
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{
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struct mtu3_ep *mep;
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struct mtu3 *mtu;
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unsigned long flags;
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int ret = -EINVAL;
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if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
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pr_debug("%s invalid parameters\n", __func__);
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return -EINVAL;
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}
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if (!desc->wMaxPacketSize) {
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pr_debug("%s missing wMaxPacketSize\n", __func__);
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return -EINVAL;
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}
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mep = to_mtu3_ep(ep);
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mtu = mep->mtu;
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/* check ep number and direction against endpoint */
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if (usb_endpoint_num(desc) != mep->epnum)
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return -EINVAL;
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if (!!usb_endpoint_dir_in(desc) ^ !!mep->is_in)
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return -EINVAL;
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dev_dbg(mtu->dev, "%s %s\n", __func__, ep->name);
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if (mep->flags & MTU3_EP_ENABLED) {
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dev_warn(mtu->dev, "%s is already enabled\n", mep->name);
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return 0;
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}
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spin_lock_irqsave(&mtu->lock, flags);
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mep->desc = desc;
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mep->comp_desc = ep->comp_desc;
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ret = mtu3_ep_enable(mep);
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if (ret)
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goto error;
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mep->flags = MTU3_EP_ENABLED;
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mtu->active_ep++;
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error:
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spin_unlock_irqrestore(&mtu->lock, flags);
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dev_dbg(mtu->dev, "%s active_ep=%d\n", __func__, mtu->active_ep);
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return ret;
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}
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static int mtu3_gadget_ep_disable(struct usb_ep *ep)
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{
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struct mtu3_ep *mep = to_mtu3_ep(ep);
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struct mtu3 *mtu = mep->mtu;
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unsigned long flags;
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dev_dbg(mtu->dev, "%s %s\n", __func__, mep->name);
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if (!(mep->flags & MTU3_EP_ENABLED)) {
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dev_warn(mtu->dev, "%s is already disabled\n", mep->name);
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return 0;
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}
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spin_lock_irqsave(&mtu->lock, flags);
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mtu3_ep_disable(mep);
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mep->flags = 0;
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mtu->active_ep--;
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spin_unlock_irqrestore(&mtu->lock, flags);
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dev_dbg(mtu->dev, "%s active_ep=%d, mtu3 is_active=%d\n",
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__func__, mtu->active_ep, mtu->is_active);
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return 0;
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}
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struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
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{
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struct mtu3_ep *mep = to_mtu3_ep(ep);
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struct mtu3_request *mreq;
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mreq = kzalloc(sizeof(*mreq), gfp_flags);
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if (!mreq)
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return NULL;
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mreq->request.dma = DMA_ADDR_INVALID;
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mreq->epnum = mep->epnum;
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mreq->mep = mep;
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return &mreq->request;
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}
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void mtu3_free_request(struct usb_ep *ep, struct usb_request *req)
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{
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struct mtu3_request *mreq = to_mtu3_request(req);
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kfree(mreq);
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}
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static int mtu3_gadget_queue(struct usb_ep *ep,
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struct usb_request *req, gfp_t gfp_flags)
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{
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struct mtu3_ep *mep = to_mtu3_ep(ep);
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struct mtu3_request *mreq = to_mtu3_request(req);
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struct mtu3 *mtu = mep->mtu;
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unsigned long flags;
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int ret = 0;
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if (!req->buf)
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return -ENODATA;
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if (mreq->mep != mep)
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return -EINVAL;
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dev_dbg(mtu->dev, "%s %s EP%d(%s), req=%p, maxp=%d, len#%d\n",
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__func__, mep->is_in ? "TX" : "RX", mreq->epnum, ep->name,
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mreq, ep->maxpacket, mreq->request.length);
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if (req->length > GPD_BUF_SIZE) {
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dev_warn(mtu->dev,
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"req length > supported MAX:%d requested:%d\n",
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GPD_BUF_SIZE, req->length);
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return -EOPNOTSUPP;
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}
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/* don't queue if the ep is down */
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if (!mep->desc) {
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dev_dbg(mtu->dev, "req=%p queued to %s while it's disabled\n",
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req, ep->name);
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return -ESHUTDOWN;
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}
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mreq->mtu = mtu;
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mreq->request.actual = 0;
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mreq->request.status = -EINPROGRESS;
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ret = usb_gadget_map_request(&mtu->g, req, mep->is_in);
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if (ret) {
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dev_err(mtu->dev, "dma mapping failed\n");
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return ret;
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}
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spin_lock_irqsave(&mtu->lock, flags);
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if (mtu3_prepare_transfer(mep)) {
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ret = -EAGAIN;
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goto error;
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}
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list_add_tail(&mreq->list, &mep->req_list);
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mtu3_insert_gpd(mep, mreq);
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mtu3_qmu_resume(mep);
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error:
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spin_unlock_irqrestore(&mtu->lock, flags);
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return ret;
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}
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static int mtu3_gadget_dequeue(struct usb_ep *ep, struct usb_request *req)
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{
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struct mtu3_ep *mep = to_mtu3_ep(ep);
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struct mtu3_request *mreq = to_mtu3_request(req);
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struct mtu3_request *r;
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struct mtu3 *mtu = mep->mtu;
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unsigned long flags;
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int ret = 0;
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if (mreq->mep != mep)
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return -EINVAL;
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dev_dbg(mtu->dev, "%s : req=%p\n", __func__, req);
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spin_lock_irqsave(&mtu->lock, flags);
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list_for_each_entry(r, &mep->req_list, list) {
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if (r == mreq)
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break;
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}
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if (r != mreq) {
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dev_dbg(mtu->dev, "req=%p not queued to %s\n", req, ep->name);
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ret = -EINVAL;
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goto done;
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}
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mtu3_qmu_flush(mep); /* REVISIT: set BPS ?? */
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mtu3_req_complete(mep, req, -ECONNRESET);
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mtu3_qmu_start(mep);
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done:
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spin_unlock_irqrestore(&mtu->lock, flags);
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return ret;
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}
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/*
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* Set or clear the halt bit of an EP.
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* A halted EP won't TX/RX any data but will queue requests.
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*/
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static int mtu3_gadget_ep_set_halt(struct usb_ep *ep, int value)
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{
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struct mtu3_ep *mep = to_mtu3_ep(ep);
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struct mtu3 *mtu = mep->mtu;
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struct mtu3_request *mreq;
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unsigned long flags = 0;
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int ret = 0;
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dev_dbg(mtu->dev, "%s : %s...", __func__, ep->name);
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spin_lock_irqsave(&mtu->lock, flags);
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if (mep->type == USB_ENDPOINT_XFER_ISOC) {
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ret = -EINVAL;
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goto done;
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}
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mreq = next_request(mep);
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if (value) {
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/*
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* If there is not request for TX-EP, QMU will not transfer
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* data to TX-FIFO, so no need check whether TX-FIFO
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* holds bytes or not here
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*/
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if (mreq) {
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dev_dbg(mtu->dev, "req in progress, cannot halt %s\n",
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ep->name);
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ret = -EAGAIN;
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goto done;
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}
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} else {
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mep->flags &= ~MTU3_EP_WEDGE;
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}
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dev_dbg(mtu->dev, "%s %s stall\n", ep->name, value ? "set" : "clear");
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mtu3_ep_stall_set(mep, value);
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done:
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spin_unlock_irqrestore(&mtu->lock, flags);
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return ret;
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}
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/* Sets the halt feature with the clear requests ignored */
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static int mtu3_gadget_ep_set_wedge(struct usb_ep *ep)
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{
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struct mtu3_ep *mep = to_mtu3_ep(ep);
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mep->flags |= MTU3_EP_WEDGE;
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return usb_ep_set_halt(ep);
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}
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static const struct usb_ep_ops mtu3_ep_ops = {
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.enable = mtu3_gadget_ep_enable,
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.disable = mtu3_gadget_ep_disable,
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.alloc_request = mtu3_alloc_request,
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.free_request = mtu3_free_request,
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.queue = mtu3_gadget_queue,
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.dequeue = mtu3_gadget_dequeue,
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.set_halt = mtu3_gadget_ep_set_halt,
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.set_wedge = mtu3_gadget_ep_set_wedge,
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};
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static int mtu3_gadget_get_frame(struct usb_gadget *gadget)
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{
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struct mtu3 *mtu = gadget_to_mtu3(gadget);
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return (int)mtu3_readl(mtu->mac_base, U3D_USB20_FRAME_NUM);
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}
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static int mtu3_gadget_wakeup(struct usb_gadget *gadget)
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{
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struct mtu3 *mtu = gadget_to_mtu3(gadget);
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unsigned long flags;
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dev_dbg(mtu->dev, "%s\n", __func__);
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/* remote wakeup feature is not enabled by host */
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if (!mtu->may_wakeup)
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return -EOPNOTSUPP;
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spin_lock_irqsave(&mtu->lock, flags);
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if (mtu->g.speed >= USB_SPEED_SUPER) {
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mtu3_setbits(mtu->mac_base, U3D_LINK_POWER_CONTROL, UX_EXIT);
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} else {
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mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
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spin_unlock_irqrestore(&mtu->lock, flags);
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mdelay(10);
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spin_lock_irqsave(&mtu->lock, flags);
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mtu3_clrbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
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}
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spin_unlock_irqrestore(&mtu->lock, flags);
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return 0;
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}
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static int mtu3_gadget_set_self_powered(struct usb_gadget *gadget,
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int is_selfpowered)
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{
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struct mtu3 *mtu = gadget_to_mtu3(gadget);
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mtu->is_self_powered = !!is_selfpowered;
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return 0;
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}
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static int mtu3_gadget_pullup(struct usb_gadget *gadget, int is_on)
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{
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struct mtu3 *mtu = gadget_to_mtu3(gadget);
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unsigned long flags;
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dev_dbg(mtu->dev, "%s (%s) for %sactive device\n", __func__,
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is_on ? "on" : "off", mtu->is_active ? "" : "in");
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/* we'd rather not pullup unless the device is active. */
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spin_lock_irqsave(&mtu->lock, flags);
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is_on = !!is_on;
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if (!mtu->is_active) {
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/* save it for mtu3_start() to process the request */
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mtu->softconnect = is_on;
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} else if (is_on != mtu->softconnect) {
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mtu->softconnect = is_on;
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mtu3_dev_on_off(mtu, is_on);
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}
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spin_unlock_irqrestore(&mtu->lock, flags);
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return 0;
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}
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static int mtu3_gadget_start(struct usb_gadget *gadget,
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struct usb_gadget_driver *driver)
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{
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struct mtu3 *mtu = gadget_to_mtu3(gadget);
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unsigned long flags;
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if (mtu->gadget_driver) {
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dev_err(mtu->dev, "%s is already bound to %s\n",
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mtu->g.name, mtu->gadget_driver->function);
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return -EBUSY;
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}
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dev_dbg(mtu->dev, "bind driver %s\n", driver->function);
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spin_lock_irqsave(&mtu->lock, flags);
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mtu->softconnect = 0;
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mtu->gadget_driver = driver;
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mtu3_start(mtu);
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spin_unlock_irqrestore(&mtu->lock, flags);
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return 0;
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}
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static void stop_activity(struct mtu3 *mtu)
|
|
{
|
|
int i;
|
|
|
|
mtu->g.speed = USB_SPEED_UNKNOWN;
|
|
|
|
/* deactivate the hardware */
|
|
if (mtu->softconnect) {
|
|
mtu->softconnect = 0;
|
|
mtu3_dev_on_off(mtu, 0);
|
|
}
|
|
|
|
/*
|
|
* killing any outstanding requests will quiesce the driver;
|
|
* then report disconnect
|
|
*/
|
|
nuke(mtu->ep0, -ESHUTDOWN);
|
|
for (i = 1; i < mtu->num_eps; i++) {
|
|
nuke(mtu->in_eps + i, -ESHUTDOWN);
|
|
nuke(mtu->out_eps + i, -ESHUTDOWN);
|
|
}
|
|
}
|
|
|
|
static int mtu3_gadget_stop(struct usb_gadget *g)
|
|
{
|
|
struct mtu3 *mtu = gadget_to_mtu3(g);
|
|
unsigned long flags;
|
|
|
|
dev_dbg(mtu->dev, "%s\n", __func__);
|
|
|
|
spin_lock_irqsave(&mtu->lock, flags);
|
|
|
|
stop_activity(mtu);
|
|
mtu->gadget_driver = NULL;
|
|
mtu3_stop(mtu);
|
|
|
|
spin_unlock_irqrestore(&mtu->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
mtu3_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed)
|
|
{
|
|
struct mtu3 *mtu = gadget_to_mtu3(g);
|
|
unsigned long flags;
|
|
|
|
dev_dbg(mtu->dev, "%s %d\n", __func__, speed);
|
|
|
|
spin_lock_irqsave(&mtu->lock, flags);
|
|
mtu3_set_speed(mtu, speed);
|
|
spin_unlock_irqrestore(&mtu->lock, flags);
|
|
}
|
|
|
|
static const struct usb_gadget_ops mtu3_gadget_ops = {
|
|
.get_frame = mtu3_gadget_get_frame,
|
|
.wakeup = mtu3_gadget_wakeup,
|
|
.set_selfpowered = mtu3_gadget_set_self_powered,
|
|
.pullup = mtu3_gadget_pullup,
|
|
.udc_start = mtu3_gadget_start,
|
|
.udc_stop = mtu3_gadget_stop,
|
|
.udc_set_speed = mtu3_gadget_set_speed,
|
|
};
|
|
|
|
static void mtu3_state_reset(struct mtu3 *mtu)
|
|
{
|
|
mtu->address = 0;
|
|
mtu->ep0_state = MU3D_EP0_STATE_SETUP;
|
|
mtu->may_wakeup = 0;
|
|
mtu->u1_enable = 0;
|
|
mtu->u2_enable = 0;
|
|
mtu->delayed_status = false;
|
|
mtu->test_mode = false;
|
|
}
|
|
|
|
static void init_hw_ep(struct mtu3 *mtu, struct mtu3_ep *mep,
|
|
u32 epnum, u32 is_in)
|
|
{
|
|
mep->epnum = epnum;
|
|
mep->mtu = mtu;
|
|
mep->is_in = is_in;
|
|
|
|
INIT_LIST_HEAD(&mep->req_list);
|
|
|
|
sprintf(mep->name, "ep%d%s", epnum,
|
|
!epnum ? "" : (is_in ? "in" : "out"));
|
|
|
|
mep->ep.name = mep->name;
|
|
INIT_LIST_HEAD(&mep->ep.ep_list);
|
|
|
|
/* initialize maxpacket as SS */
|
|
if (!epnum) {
|
|
usb_ep_set_maxpacket_limit(&mep->ep, USB_HS_MAXP);
|
|
mep->ep.ops = &mtu3_ep0_ops;
|
|
mtu->g.ep0 = &mep->ep;
|
|
} else {
|
|
usb_ep_set_maxpacket_limit(&mep->ep, USB_SS_MAXP);
|
|
mep->ep.ops = &mtu3_ep_ops;
|
|
list_add_tail(&mep->ep.ep_list, &mtu->g.ep_list);
|
|
}
|
|
|
|
dev_dbg(mtu->dev, "%s, name=%s, maxp=%d\n", __func__, mep->ep.name,
|
|
mep->ep.maxpacket);
|
|
}
|
|
|
|
static void mtu3_gadget_init_eps(struct mtu3 *mtu)
|
|
{
|
|
u8 epnum;
|
|
|
|
/* initialize endpoint list just once */
|
|
INIT_LIST_HEAD(&mtu->g.ep_list);
|
|
|
|
dev_dbg(mtu->dev, "%s num_eps(1 for a pair of tx&rx ep)=%d\n",
|
|
__func__, mtu->num_eps);
|
|
|
|
init_hw_ep(mtu, mtu->ep0, 0, 0);
|
|
for (epnum = 1; epnum < mtu->num_eps; epnum++) {
|
|
init_hw_ep(mtu, mtu->in_eps + epnum, epnum, 1);
|
|
init_hw_ep(mtu, mtu->out_eps + epnum, epnum, 0);
|
|
}
|
|
}
|
|
|
|
int mtu3_gadget_setup(struct mtu3 *mtu)
|
|
{
|
|
mtu->g.ops = &mtu3_gadget_ops;
|
|
mtu->g.max_speed = mtu->max_speed;
|
|
mtu->g.speed = USB_SPEED_UNKNOWN;
|
|
mtu->g.is_dualspeed = 1;
|
|
mtu->g.name = MTU3_DRIVER_NAME;
|
|
mtu->is_active = 0;
|
|
mtu->delayed_status = false;
|
|
|
|
mtu3_gadget_init_eps(mtu);
|
|
|
|
return usb_add_gadget_udc((struct device *)mtu->dev, &mtu->g);
|
|
}
|
|
|
|
void mtu3_gadget_cleanup(struct mtu3 *mtu)
|
|
{
|
|
usb_del_gadget_udc(&mtu->g);
|
|
}
|
|
|
|
void mtu3_gadget_resume(struct mtu3 *mtu)
|
|
{
|
|
dev_dbg(mtu->dev, "gadget RESUME\n");
|
|
if (mtu->gadget_driver && mtu->gadget_driver->resume) {
|
|
spin_unlock(&mtu->lock);
|
|
mtu->gadget_driver->resume(&mtu->g);
|
|
spin_lock(&mtu->lock);
|
|
}
|
|
}
|
|
|
|
/* called when SOF packets stop for 3+ msec or enters U3 */
|
|
void mtu3_gadget_suspend(struct mtu3 *mtu)
|
|
{
|
|
dev_dbg(mtu->dev, "gadget SUSPEND\n");
|
|
if (mtu->gadget_driver && mtu->gadget_driver->suspend) {
|
|
spin_unlock(&mtu->lock);
|
|
mtu->gadget_driver->suspend(&mtu->g);
|
|
spin_lock(&mtu->lock);
|
|
}
|
|
}
|
|
|
|
/* called when VBUS drops below session threshold, and in other cases */
|
|
void mtu3_gadget_disconnect(struct mtu3 *mtu)
|
|
{
|
|
dev_dbg(mtu->dev, "gadget DISCONNECT\n");
|
|
if (mtu->gadget_driver && mtu->gadget_driver->disconnect) {
|
|
spin_unlock(&mtu->lock);
|
|
mtu->gadget_driver->disconnect(&mtu->g);
|
|
spin_lock(&mtu->lock);
|
|
}
|
|
|
|
mtu3_state_reset(mtu);
|
|
usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED);
|
|
}
|
|
|
|
void mtu3_gadget_reset(struct mtu3 *mtu)
|
|
{
|
|
dev_dbg(mtu->dev, "gadget RESET\n");
|
|
|
|
/* report disconnect, if we didn't flush EP state */
|
|
if (mtu->g.speed != USB_SPEED_UNKNOWN)
|
|
mtu3_gadget_disconnect(mtu);
|
|
else
|
|
mtu3_state_reset(mtu);
|
|
}
|