// SPDX-License-Identifier: GPL-2.0
/*
* mtu3_gadget.c - MediaTek usb3 DRD peripheral support
*
* Copyright (C) 2016 MediaTek Inc.
*
* Author: Chunfeng Yun <[email protected]>
*/
#include "mtu3.h"
#include "mtu3_trace.h"
void mtu3_req_complete(struct mtu3_ep *mep,
struct usb_request *req, int status)
__releases(mep->mtu->lock)
__acquires(mep->mtu->lock)
{
struct mtu3_request *mreq = to_mtu3_request(req);
struct mtu3 *mtu = mreq->mtu;
list_del(&mreq->list);
if (req->status == -EINPROGRESS)
req->status = status;
trace_mtu3_req_complete(mreq);
/* ep0 makes use of PIO, needn't unmap it */
if (mep->epnum)
usb_gadget_unmap_request(&mtu->g, req, mep->is_in);
dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n",
mep->name, req, req->status, req->actual, req->length);
spin_unlock(&mtu->lock);
usb_gadget_giveback_request(&mep->ep, req);
spin_lock(&mtu->lock);
}
static void nuke(struct mtu3_ep *mep, const int status)
{
struct mtu3_request *mreq = NULL;
if (list_empty(&mep->req_list))
return;
dev_dbg(mep->mtu->dev, "abort %s's req: sts %d\n", mep->name, status);
/* exclude EP0 */
if (mep->epnum)
mtu3_qmu_flush(mep);
while (!list_empty(&mep->req_list)) {
mreq = list_first_entry(&mep->req_list,
struct mtu3_request, list);
mtu3_req_complete(mep, &mreq->request, status);
}
}
static int mtu3_ep_enable(struct mtu3_ep *mep)
{
const struct usb_endpoint_descriptor *desc;
const struct usb_ss_ep_comp_descriptor *comp_desc;
struct mtu3 *mtu = mep->mtu;
u32 interval = 0;
u32 mult = 0;
u32 burst = 0;
int ret;
desc = mep->desc;
comp_desc = mep->comp_desc;
mep->type = usb_endpoint_type(desc);
mep->maxp = usb_endpoint_maxp(desc);
switch (mtu->g.speed) {
case USB_SPEED_SUPER:
case USB_SPEED_SUPER_PLUS:
if (usb_endpoint_xfer_int(desc) ||
usb_endpoint_xfer_isoc(desc)) {
interval = desc->bInterval;
interval = clamp_val(interval, 1, 16);
if (usb_endpoint_xfer_isoc(desc) && comp_desc)
mult = comp_desc->bmAttributes;
}
if (comp_desc)
burst = comp_desc->bMaxBurst;
break;
case USB_SPEED_HIGH:
if (usb_endpoint_xfer_isoc(desc) ||
usb_endpoint_xfer_int(desc)) {
interval = desc->bInterval;
interval = clamp_val(interval, 1, 16);
mult = usb_endpoint_maxp_mult(desc) - 1;
}
break;
case USB_SPEED_FULL:
if (usb_endpoint_xfer_isoc(desc))
interval = clamp_val(desc->bInterval, 1, 16);
else if (usb_endpoint_xfer_int(desc))
interval = clamp_val(desc->bInterval, 1, 255);
break;
default:
break; /*others are ignored */
}
dev_dbg(mtu->dev, "%s maxp:%d, interval:%d, burst:%d, mult:%d\n",
__func__, mep->maxp, interval, burst, mult);
mep->ep.maxpacket = mep->maxp;
mep->ep.desc = desc;
mep->ep.comp_desc = comp_desc;
/* slot mainly affects bulk/isoc transfer, so ignore int */
mep->slot = usb_endpoint_xfer_int(desc) ? 0 : mtu->slot;
ret = mtu3_config_ep(mtu, mep, interval, burst, mult);
if (ret < 0)
return ret;
ret = mtu3_gpd_ring_alloc(mep);
if (ret < 0) {
mtu3_deconfig_ep(mtu, mep);
return ret;
}
mtu3_qmu_start(mep);
return 0;
}
static int mtu3_ep_disable(struct mtu3_ep *mep)
{
struct mtu3 *mtu = mep->mtu;
/* abort all pending requests */
nuke(mep, -ESHUTDOWN);
mtu3_qmu_stop(mep);
mtu3_deconfig_ep(mtu, mep);
mtu3_gpd_ring_free(mep);
mep->desc = NULL;
mep->ep.desc = NULL;
mep->comp_desc = NULL;
mep->type = 0;
mep->flags = 0;
return 0;
}
static int mtu3_gadget_ep_enable(struct usb_ep *ep,
const struct usb_endpoint_descriptor *desc)
{
struct mtu3_ep *mep;
struct mtu3 *mtu;
unsigned long flags;
int ret = -EINVAL;
if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
pr_debug("%s invalid parameters\n", __func__);
return -EINVAL;
}
if (!desc->wMaxPacketSize) {
pr_debug("%s missing wMaxPacketSize\n", __func__);
return -EINVAL;
}
mep = to_mtu3_ep(ep);
mtu = mep->mtu;
/* check ep number and direction against endpoint */
if (usb_endpoint_num(desc) != mep->epnum)
return -EINVAL;
if (!!usb_endpoint_dir_in(desc) ^ !!mep->is_in)
return -EINVAL;
dev_dbg(mtu->dev, "%s %s\n", __func__, ep->name);
if (mep->flags & MTU3_EP_ENABLED) {
dev_WARN_ONCE(mtu->dev, true, "%s is already enabled\n",
mep->name);
return 0;
}
spin_lock_irqsave(&mtu->lock, flags);
mep->desc = desc;
mep->comp_desc = ep->comp_desc;
ret = mtu3_ep_enable(mep);
if (ret)
goto error;
mep->flags = MTU3_EP_ENABLED;
mtu->active_ep++;
error:
spin_unlock_irqrestore(&mtu->lock, flags);
dev_dbg(mtu->dev, "%s active_ep=%d\n", __func__, mtu->active_ep);
trace_mtu3_gadget_ep_enable(mep);
return ret;
}
static int mtu3_gadget_ep_disable(struct usb_ep *ep)
{
struct mtu3_ep *mep = to_mtu3_ep(ep);
struct mtu3 *mtu = mep->mtu;
unsigned long flags;
dev_dbg(mtu->dev, "%s %s\n", __func__, mep->name);
trace_mtu3_gadget_ep_disable(mep);
if (!(mep->flags & MTU3_EP_ENABLED)) {
dev_warn(mtu->dev, "%s is already disabled\n", mep->name);
return 0;
}
spin_lock_irqsave(&mtu->lock, flags);
mtu3_ep_disable(mep);
mep->flags = 0;
mtu->active_ep--;
spin_unlock_irqrestore(&(mtu->lock), flags);
dev_dbg(mtu->dev, "%s active_ep=%d, mtu3 is_active=%d\n",
__func__, mtu->active_ep, mtu->is_active);
return 0;
}
struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
{
struct mtu3_ep *mep = to_mtu3_ep(ep);
struct mtu3_request *mreq;
mreq = kzalloc(sizeof(*mreq), gfp_flags);
if (!mreq)
return NULL;
mreq->request.dma = DMA_ADDR_INVALID;
mreq->epnum = mep->epnum;
mreq->mep = mep;
INIT_LIST_HEAD(&mreq->list);
trace_mtu3_alloc_request(mreq);
return &mreq->request;
}
void mtu3_free_request(struct usb_ep *ep, struct usb_request *req)
{
struct mtu3_request *mreq = to_mtu3_request(req);
trace_mtu3_free_request(mreq);
kfree(mreq);
}
static int mtu3_gadget_queue(struct usb_ep *ep,
struct usb_request *req, gfp_t gfp_flags)
{
struct mtu3_ep *mep = to_mtu3_ep(ep);
struct mtu3_request *mreq = to_mtu3_request(req);
struct mtu3 *mtu = mep->mtu;
unsigned long flags;
int ret = 0;
if (!req->buf)
return -ENODATA;
if (mreq->mep != mep)
return -EINVAL;
dev_dbg(mtu->dev, "%s %s EP%d(%s), req=%p, maxp=%d, len#%d\n",
__func__, mep->is_in ? "TX" : "RX", mreq->epnum, ep->name,
mreq, ep->maxpacket, mreq->request.length);
if (req->length > GPD_BUF_SIZE ||
(mtu->gen2cp && req->length > GPD_BUF_SIZE_EL)) {
dev_warn(mtu->dev,
"req length > supported MAX:%d requested:%d\n",
mtu->gen2cp ? GPD_BUF_SIZE_EL : GPD_BUF_SIZE,
req->length);
return -EOPNOTSUPP;
}
/* don't queue if the ep is down */
if (!mep->desc) {
dev_dbg(mtu->dev, "req=%p queued to %s while it's disabled\n",
req, ep->name);
return -ESHUTDOWN;
}
mreq->mtu = mtu;
mreq->request.actual = 0;
mreq->request.status = -EINPROGRESS;
ret = usb_gadget_map_request(&mtu->g, req, mep->is_in);
if (ret) {
dev_err(mtu->dev, "dma mapping failed\n");
return ret;
}
spin_lock_irqsave(&mtu->lock, flags);
if (mtu3_prepare_transfer(mep)) {
ret = -EAGAIN;
goto error;
}
list_add_tail(&mreq->list, &mep->req_list);
mtu3_insert_gpd(mep, mreq);
mtu3_qmu_resume(mep);
error:
spin_unlock_irqrestore(&mtu->lock, flags);
trace_mtu3_gadget_queue(mreq);
return ret;
}
static int mtu3_gadget_dequeue(struct usb_ep *ep, struct usb_request *req)
{
struct mtu3_ep *mep = to_mtu3_ep(ep);
struct mtu3_request *mreq = to_mtu3_request(req);
struct mtu3_request *r;
struct mtu3 *mtu = mep->mtu;
unsigned long flags;
int ret = 0;
if (mreq->mep != mep)
return -EINVAL;
dev_dbg(mtu->dev, "%s : req=%p\n", __func__, req);
trace_mtu3_gadget_dequeue(mreq);
spin_lock_irqsave(&mtu->lock, flags);
list_for_each_entry(r, &mep->req_list, list) {
if (r == mreq)
break;
}
if (r != mreq) {
dev_dbg(mtu->dev, "req=%p not queued to %s\n", req, ep->name);
ret = -EINVAL;
goto done;
}
mtu3_qmu_flush(mep); /* REVISIT: set BPS ?? */
mtu3_req_complete(mep, req, -ECONNRESET);
mtu3_qmu_start(mep);
done:
spin_unlock_irqrestore(&mtu->lock, flags);
return ret;
}
/*
* Set or clear the halt bit of an EP.
* A halted EP won't TX/RX any data but will queue requests.
*/
static int mtu3_gadget_ep_set_halt(struct usb_ep *ep, int value)
{
struct mtu3_ep *mep = to_mtu3_ep(ep);
struct mtu3 *mtu = mep->mtu;
struct mtu3_request *mreq;
unsigned long flags;
int ret = 0;
dev_dbg(mtu->dev, "%s : %s...", __func__, ep->name);
spin_lock_irqsave(&mtu->lock, flags);
if (mep->type == USB_ENDPOINT_XFER_ISOC) {
ret = -EINVAL;
goto done;
}
mreq = next_request(mep);
if (value) {
/*
* If there is not request for TX-EP, QMU will not transfer
* data to TX-FIFO, so no need check whether TX-FIFO
* holds bytes or not here
*/
if (mreq) {
dev_dbg(mtu->dev, "req in progress, cannot halt %s\n",
ep->name);
ret = -EAGAIN;
goto done;
}
} else {
mep->flags &= ~MTU3_EP_WEDGE;
}
dev_dbg(mtu->dev, "%s %s stall\n", ep->name, value ? "set" : "clear");
mtu3_ep_stall_set(mep, value);
done:
spin_unlock_irqrestore(&mtu->lock, flags);
trace_mtu3_gadget_ep_set_halt(mep);
return ret;
}
/* Sets the halt feature with the clear requests ignored */
static int mtu3_gadget_ep_set_wedge(struct usb_ep *ep)
{
struct mtu3_ep *mep = to_mtu3_ep(ep);
mep->flags |= MTU3_EP_WEDGE;
return usb_ep_set_halt(ep);
}
static const struct usb_ep_ops mtu3_ep_ops = {
.enable = mtu3_gadget_ep_enable,
.disable = mtu3_gadget_ep_disable,
.alloc_request = mtu3_alloc_request,
.free_request = mtu3_free_request,
.queue = mtu3_gadget_queue,
.dequeue = mtu3_gadget_dequeue,
.set_halt = mtu3_gadget_ep_set_halt,
.set_wedge = mtu3_gadget_ep_set_wedge,
};
static int mtu3_gadget_get_frame(struct usb_gadget *gadget)
{
struct mtu3 *mtu = gadget_to_mtu3(gadget);
return (int)mtu3_readl(mtu->mac_base, U3D_USB20_FRAME_NUM);
}
static void function_wake_notif(struct mtu3 *mtu, u8 intf)
{
mtu3_writel(mtu->mac_base, U3D_DEV_NOTIF_0,
TYPE_FUNCTION_WAKE | DEV_NOTIF_VAL_FW(intf));
mtu3_setbits(mtu->mac_base, U3D_DEV_NOTIF_0, SEND_DEV_NOTIF);
}
static int mtu3_gadget_wakeup(struct usb_gadget *gadget)
{
struct mtu3 *mtu = gadget_to_mtu3(gadget);
unsigned long flags;
dev_dbg(mtu->dev, "%s\n", __func__);
/* remote wakeup feature is not enabled by host */
if (!mtu->may_wakeup)
return -EOPNOTSUPP;
spin_lock_irqsave(&mtu->lock, flags);
if (mtu->g.speed >= USB_SPEED_SUPER) {
/*
* class driver may do function wakeup even UFP is in U0,
* and UX_EXIT only takes effect in U1/U2/U3;
*/
mtu3_setbits(mtu->mac_base, U3D_LINK_POWER_CONTROL, UX_EXIT);
/*
* Assume there's only one function on the composite device
* and enable remote wake for the first interface.
* FIXME if the IAD (interface association descriptor) shows
* there is more than one function.
*/
function_wake_notif(mtu, 0);
} else {
mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
spin_unlock_irqrestore(&mtu->lock, flags);
usleep_range(10000, 11000);
spin_lock_irqsave(&mtu->lock, flags);
mtu3_clrbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME);
}
spin_unlock_irqrestore(&mtu->lock, flags);
return 0;
}
static int mtu3_gadget_set_self_powered(struct usb_gadget *gadget,
int is_selfpowered)
{
struct mtu3 *mtu = gadget_to_mtu3(gadget);
mtu->is_self_powered = !!is_selfpowered;
return 0;
}
static int mtu3_gadget_pullup(struct usb_gadget *gadget, int is_on)
{
struct mtu3 *mtu = gadget_to_mtu3(gadget);
unsigned long flags;
dev_dbg(mtu->dev, "%s (%s) for %sactive device\n", __func__,
is_on ? "on" : "off", mtu->is_active ? "" : "in");
pm_runtime_get_sync(mtu->dev);
/* we'd rather not pullup unless the device is active. */
spin_lock_irqsave(&mtu->lock, flags);
is_on = !!is_on;
if (!mtu->is_active) {
/* save it for mtu3_start() to process the request */
mtu->softconnect = is_on;
} else if (is_on != mtu->softconnect) {
mtu->softconnect = is_on;
mtu3_dev_on_off(mtu, is_on);
}
spin_unlock_irqrestore(&mtu->lock, flags);
pm_runtime_put(mtu->dev);
return 0;
}
static int mtu3_gadget_start(struct usb_gadget *gadget,
struct usb_gadget_driver *driver)
{
struct mtu3 *mtu = gadget_to_mtu3(gadget);
unsigned long flags;
if (mtu->gadget_driver) {
dev_err(mtu->dev, "%s is already bound to %s\n",
mtu->g.name, mtu->gadget_driver->driver.name);
return -EBUSY;
}
dev_dbg(mtu->dev, "bind driver %s\n", driver->function);
pm_runtime_get_sync(mtu->dev);
spin_lock_irqsave(&mtu->lock, flags);
mtu->softconnect = 0;
mtu->gadget_driver = driver;
if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
mtu3_start(mtu);
spin_unlock_irqrestore(&mtu->lock, flags);
pm_runtime_put(mtu->dev);
return 0;
}
static void stop_activity(struct mtu3 *mtu)
{
struct usb_gadget_driver *driver = mtu->gadget_driver;
int i;
/* don't disconnect if it's not connected */
if (mtu->g.speed == USB_SPEED_UNKNOWN)
driver = NULL;
else
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);
}
if (driver) {
spin_unlock(&mtu->lock);
driver->disconnect(&mtu->g);
spin_lock(&mtu->lock);
}
}
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;
if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL)
mtu3_stop(mtu);
spin_unlock_irqrestore(&mtu->lock, flags);
synchronize_irq(mtu->irq);
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 %s\n", __func__, usb_speed_string(speed));
spin_lock_irqsave(&mtu->lock, flags);
mtu->speed = speed;
spin_unlock_irqrestore(&mtu->lock, flags);
}
static void mtu3_gadget_async_callbacks(struct usb_gadget *g, bool enable)
{
struct mtu3 *mtu = gadget_to_mtu3(g);
unsigned long flags;
dev_dbg(mtu->dev, "%s %s\n", __func__, enable ? "en" : "dis");
spin_lock_irqsave(&mtu->lock, flags);
mtu->async_callbacks = enable;
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,
.udc_async_callbacks = mtu3_gadget_async_callbacks,
};
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, 512);
mep->ep.caps.type_control = true;
mep->ep.ops = &mtu3_ep0_ops;
mtu->g.ep0 = &mep->ep;
} else {
usb_ep_set_maxpacket_limit(&mep->ep, 1024);
mep->ep.caps.type_iso = true;
mep->ep.caps.type_bulk = true;
mep->ep.caps.type_int = true;
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);
if (!epnum) {
mep->ep.caps.dir_in = true;
mep->ep.caps.dir_out = true;
} else if (is_in) {
mep->ep.caps.dir_in = true;
} else {
mep->ep.caps.dir_out = true;
}
}
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.sg_supported = 0;
mtu->g.name = MTU3_DRIVER_NAME;
mtu->g.irq = mtu->irq;
mtu->is_active = 0;
mtu->delayed_status = false;
mtu3_gadget_init_eps(mtu);
return usb_add_gadget_udc(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->async_callbacks && 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->async_callbacks && 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->async_callbacks && 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);
}
Codebase Browser
linux