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c450960187
linux/drivers/usb/dwc3/gadget.c
John Youn c450960187 usb: dwc3: Fix assignment of EP transfer resources 
The assignement of EP transfer resources was not handled properly in the
dwc3 driver. Commit aebda61871 ("usb: dwc3: Reset the transfer
resource index on SET_INTERFACE") previously fixed one aspect of this
where resources may be exhausted with multiple calls to SET_INTERFACE.
However, it introduced an issue where composite devices with multiple
interfaces can be assigned the same transfer resources for different
endpoints. This patch solves both issues.

The assignment of transfer resources cannot perfectly follow the data
book due to the fact that the controller driver does not have all
knowledge of the configuration in advance. It is given this information
piecemeal by the composite gadget framework after every
SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
programming model in this scenario can cause errors. For two reasons:

1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION and
SET_INTERFACE (8.1.5). This is incorrect in the scenario of multiple
interfaces.

2) The databook does not mention doing more DEPXFERCFG for new endpoint
on alt setting (8.1.6).

The following simplified method is used instead:

All hardware endpoints can be assigned a transfer resource and this
setting will stay persistent until either a core reset or hibernation.
So whenever we do a DEPSTARTCFG(0) we can go ahead and do DEPXFERCFG for
every hardware endpoint as well. We are guaranteed that there are as
many transfer resources as endpoints.

This patch triggers off of the calling dwc3_gadget_start_config() for
EP0-out, which always happens first, and which should only happen in one
of the above conditions.

Fixes: aebda61871 ("usb: dwc3: Reset the transfer resource index on SET_INTERFACE")
Cc: <stable@vger.kernel.org> # v3.2+
Reported-by: Ravi Babu <ravibabu@ti.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
2016-02-17 10:31:53 +02:00

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/**
* gadget.c - DesignWare USB3 DRD Controller Gadget Framework Link
*
* Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
*
* Authors: Felipe Balbi <balbi@ti.com>,
* Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 of
* the License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/dma-mapping.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include "debug.h"
#include "core.h"
#include "gadget.h"
#include "io.h"
/**
* dwc3_gadget_set_test_mode - Enables USB2 Test Modes
* @dwc: pointer to our context structure
* @mode: the mode to set (J, K SE0 NAK, Force Enable)
*
* Caller should take care of locking. This function will
* return 0 on success or -EINVAL if wrong Test Selector
* is passed
*/
int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
{
u32 reg;
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg &= ~DWC3_DCTL_TSTCTRL_MASK;
switch (mode) {
case TEST_J:
case TEST_K:
case TEST_SE0_NAK:
case TEST_PACKET:
case TEST_FORCE_EN:
reg |= mode << 1;
break;
default:
return -EINVAL;
}
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
return 0;
}
/**
* dwc3_gadget_get_link_state - Gets current state of USB Link
* @dwc: pointer to our context structure
*
* Caller should take care of locking. This function will
* return the link state on success (>= 0) or -ETIMEDOUT.
*/
int dwc3_gadget_get_link_state(struct dwc3 *dwc)
{
u32 reg;
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
return DWC3_DSTS_USBLNKST(reg);
}
/**
* dwc3_gadget_set_link_state - Sets USB Link to a particular State
* @dwc: pointer to our context structure
* @state: the state to put link into
*
* Caller should take care of locking. This function will
* return 0 on success or -ETIMEDOUT.
*/
int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
{
int retries = 10000;
u32 reg;
/*
* Wait until device controller is ready. Only applies to 1.94a and
* later RTL.
*/
if (dwc->revision >= DWC3_REVISION_194A) {
while (--retries) {
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
if (reg & DWC3_DSTS_DCNRD)
udelay(5);
else
break;
}
if (retries <= 0)
return -ETIMEDOUT;
}
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
/* set requested state */
reg |= DWC3_DCTL_ULSTCHNGREQ(state);
dwc3_writel(dwc->regs, DWC3_DCTL, reg);
/*
* The following code is racy when called from dwc3_gadget_wakeup,
* and is not needed, at least on newer versions
*/
if (dwc->revision >= DWC3_REVISION_194A)
return 0;
/* wait for a change in DSTS */
retries = 10000;
while (--retries) {
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
if (DWC3_DSTS_USBLNKST(reg) == state)
return 0;
udelay(5);
}
dwc3_trace(trace_dwc3_gadget,
"link state change request timed out");
return -ETIMEDOUT;
}
/**
* dwc3_gadget_resize_tx_fifos - reallocate fifo spaces for current use-case
* @dwc: pointer to our context structure
*
* This function will a best effort FIFO allocation in order
* to improve FIFO usage and throughput, while still allowing
* us to enable as many endpoints as possible.
*
* Keep in mind that this operation will be highly dependent
* on the configured size for RAM1 - which contains TxFifo -,
* the amount of endpoints enabled on coreConsultant tool, and
* the width of the Master Bus.
*
* In the ideal world, we would always be able to satisfy the
* following equation:
*
* ((512 + 2 * MDWIDTH-Bytes) + (Number of IN Endpoints - 1) * \
* (3 * (1024 + MDWIDTH-Bytes) + MDWIDTH-Bytes)) / MDWIDTH-Bytes
*
* Unfortunately, due to many variables that's not always the case.
*/
int dwc3_gadget_resize_tx_fifos(struct dwc3 *dwc)
{
int last_fifo_depth = 0;
int ram1_depth;
int fifo_size;
int mdwidth;
int num;
if (!dwc->needs_fifo_resize)
return 0;
ram1_depth = DWC3_RAM1_DEPTH(dwc->hwparams.hwparams7);
mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
/* MDWIDTH is represented in bits, we need it in bytes */
mdwidth >>= 3;
/*
* FIXME For now we will only allocate 1 wMaxPacketSize space
* for each enabled endpoint, later patches will come to
* improve this algorithm so that we better use the internal
* FIFO space
*/
for (num = 0; num < dwc->num_in_eps; num++) {
/* bit0 indicates direction; 1 means IN ep */
struct dwc3_ep *dep = dwc->eps[(num << 1) | 1];
int mult = 1;
int tmp;
if (!(dep->flags & DWC3_EP_ENABLED))
continue;
if (usb_endpoint_xfer_bulk(dep->endpoint.desc)
|| usb_endpoint_xfer_isoc(dep->endpoint.desc))
mult = 3;
/*
* REVISIT: the following assumes we will always have enough
* space available on the FIFO RAM for all possible use cases.
* Make sure that's true somehow and change FIFO allocation
* accordingly.
*
* If we have Bulk or Isochronous endpoints, we want
* them to be able to be very, very fast. So we're giving
* those endpoints a fifo_size which is enough for 3 full
* packets
*/
tmp = mult * (dep->endpoint.maxpacket + mdwidth);
tmp += mdwidth;
fifo_size = DIV_ROUND_UP(tmp, mdwidth);
fifo_size |= (last_fifo_depth << 16);
dwc3_trace(trace_dwc3_gadget, "%s: Fifo Addr %04x Size %d",
dep->name, last_fifo_depth, fifo_size & 0xffff);
dwc3_writel(dwc->regs, DWC3_GTXFIFOSIZ(num), fifo_size);
last_fifo_depth += (fifo_size & 0xffff);
}
return 0;
}
void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
int status)
{
struct dwc3 *dwc = dep->dwc;
int i;
if (req->queued) {
i = 0;
do {
dep->busy_slot++;
/*
* Skip LINK TRB. We can't use req->trb and check for
* DWC3_TRBCTL_LINK_TRB because it points the TRB we
* just completed (not the LINK TRB).
*/
if (((dep->busy_slot & DWC3_TRB_MASK) ==
DWC3_TRB_NUM- 1) &&
usb_endpoint_xfer_isoc(dep->endpoint.desc))
dep->busy_slot++;
} while(++i < req->request.num_mapped_sgs);
req->queued = false;
}
list_del(&req->list);
req->trb = NULL;
if (req->request.status == -EINPROGRESS)
req->request.status = status;
if (dwc->ep0_bounced && dep->number == 0)
dwc->ep0_bounced = false;
else
usb_gadget_unmap_request(&dwc->gadget, &req->request,
req->direction);
trace_dwc3_gadget_giveback(req);
spin_unlock(&dwc->lock);
usb_gadget_giveback_request(&dep->endpoint, &req->request);
spin_lock(&dwc->lock);
}
int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
{
u32 timeout = 500;
u32 reg;
trace_dwc3_gadget_generic_cmd(cmd, param);
dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
do {
reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
if (!(reg & DWC3_DGCMD_CMDACT)) {
dwc3_trace(trace_dwc3_gadget,
"Command Complete --> %d",
DWC3_DGCMD_STATUS(reg));
if (DWC3_DGCMD_STATUS(reg))
return -EINVAL;
return 0;
}
/*
* We can't sleep here, because it's also called from
* interrupt context.
*/
timeout--;
if (!timeout) {
dwc3_trace(trace_dwc3_gadget,
"Command Timed Out");
return -ETIMEDOUT;
}
udelay(1);
} while (1);
}
int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
{
struct dwc3_ep *dep = dwc->eps[ep];
u32 timeout = 500;
u32 reg;
trace_dwc3_gadget_ep_cmd(dep, cmd, params);
dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2);
dwc3_writel(dwc->regs, DWC3_DEPCMD(ep), cmd | DWC3_DEPCMD_CMDACT);
do {
reg = dwc3_readl(dwc->regs, DWC3_DEPCMD(ep));
if (!(reg & DWC3_DEPCMD_CMDACT)) {
dwc3_trace(trace_dwc3_gadget,
"Command Complete --> %d",
DWC3_DEPCMD_STATUS(reg));
if (DWC3_DEPCMD_STATUS(reg))
return -EINVAL;
return 0;
}
/*
* We can't sleep here, because it is also called from
* interrupt context.
*/
timeout--;
if (!timeout) {
dwc3_trace(trace_dwc3_gadget,
"Command Timed Out");
return -ETIMEDOUT;
}
udelay(1);
} while (1);
}
static dma_addr_t dwc3_trb_dma_offset(struct dwc3_ep *dep,
struct dwc3_trb *trb)
{
u32 offset = (char *) trb - (char *) dep->trb_pool;
return dep->trb_pool_dma + offset;
}
static int dwc3_alloc_trb_pool(struct dwc3_ep *dep)
{
struct dwc3 *dwc = dep->dwc;
if (dep->trb_pool)
return 0;
dep->trb_pool = dma_alloc_coherent(dwc->dev,
sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
&dep->trb_pool_dma, GFP_KERNEL);
if (!dep->trb_pool) {
dev_err(dep->dwc->dev, "failed to allocate trb pool for %s\n",
dep->name);
return -ENOMEM;
}
return 0;
}
static void dwc3_free_trb_pool(struct dwc3_ep *dep)
{
struct dwc3 *dwc = dep->dwc;
dma_free_coherent(dwc->dev, sizeof(struct dwc3_trb) * DWC3_TRB_NUM,
dep->trb_pool, dep->trb_pool_dma);
dep->trb_pool = NULL;
dep->trb_pool_dma = 0;
}
static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep);
/**
* dwc3_gadget_start_config - Configure EP resources
* @dwc: pointer to our controller context structure
* @dep: endpoint that is being enabled
*
* The assignment of transfer resources cannot perfectly follow the
* data book due to the fact that the controller driver does not have
* all knowledge of the configuration in advance. It is given this
* information piecemeal by the composite gadget framework after every
* SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
* programming model in this scenario can cause errors. For two
* reasons:
*
* 1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION
* and SET_INTERFACE (8.1.5). This is incorrect in the scenario of
* multiple interfaces.
*
* 2) The databook does not mention doing more DEPXFERCFG for new
* endpoint on alt setting (8.1.6).
*
* The following simplified method is used instead:
*
* All hardware endpoints can be assigned a transfer resource and this
* setting will stay persistent until either a core reset or
* hibernation. So whenever we do a DEPSTARTCFG(0) we can go ahead and
* do DEPXFERCFG for every hardware endpoint as well. We are
* guaranteed that there are as many transfer resources as endpoints.
*
* This function is called for each endpoint when it is being enabled
* but is triggered only when called for EP0-out, which always happens
* first, and which should only happen in one of the above conditions.
*/
static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep)
{
struct dwc3_gadget_ep_cmd_params params;
u32 cmd;
int i;
int ret;
if (dep->number)
return 0;
memset(&params, 0x00, sizeof(params));
cmd = DWC3_DEPCMD_DEPSTARTCFG;
ret = dwc3_send_gadget_ep_cmd(dwc, 0, cmd, &params);
if (ret)
return ret;
for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
struct dwc3_ep *dep = dwc->eps[i];
if (!dep)
continue;
ret = dwc3_gadget_set_xfer_resource(dwc, dep);
if (ret)
return ret;
}
return 0;
}
static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep,
const struct usb_endpoint_descriptor *desc,
const struct usb_ss_ep_comp_descriptor *comp_desc,
bool ignore, bool restore)
{
struct dwc3_gadget_ep_cmd_params params;
memset(&params, 0x00, sizeof(params));
params.param0 = DWC3_DEPCFG_EP_TYPE(usb_endpoint_type(desc))
| DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc));
/* Burst size is only needed in SuperSpeed mode */
if (dwc->gadget.speed == USB_SPEED_SUPER) {
u32 burst = dep->endpoint.maxburst - 1;
params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst);
}
if (ignore)
params.param0 |= DWC3_DEPCFG_IGN_SEQ_NUM;
if (restore) {
params.param0 |= DWC3_DEPCFG_ACTION_RESTORE;
params.param2 |= dep->saved_state;
}
params.param1 = DWC3_DEPCFG_XFER_COMPLETE_EN
| DWC3_DEPCFG_XFER_NOT_READY_EN;
if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
| DWC3_DEPCFG_STREAM_EVENT_EN;
dep->stream_capable = true;
}
if (!usb_endpoint_xfer_control(desc))
params.param1 |= DWC3_DEPCFG_XFER_IN_PROGRESS_EN;
/*
* We are doing 1:1 mapping for endpoints, meaning
* Physical Endpoints 2 maps to Logical Endpoint 2 and
* so on. We consider the direction bit as part of the physical
* endpoint number. So USB endpoint 0x81 is 0x03.
*/
params.param1 |= DWC3_DEPCFG_EP_NUMBER(dep->number);
/*
* We must use the lower 16 TX FIFOs even though
* HW might have more
*/
if (dep->direction)
params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1);
if (desc->bInterval) {
params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1);
dep->interval = 1 << (desc->bInterval - 1);
}
return dwc3_send_gadget_ep_cmd(dwc, dep->number,
DWC3_DEPCMD_SETEPCONFIG, &params);
}
static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep)
{
struct dwc3_gadget_ep_cmd_params params;
memset(&params, 0x00, sizeof(params));
params.param0 = DWC3_DEPXFERCFG_NUM_XFER_RES(1);
return dwc3_send_gadget_ep_cmd(dwc, dep->number,
DWC3_DEPCMD_SETTRANSFRESOURCE, &params);
}
/**
* __dwc3_gadget_ep_enable - Initializes a HW endpoint
* @dep: endpoint to be initialized
* @desc: USB Endpoint Descriptor
*
* Caller should take care of locking
*/
static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
const struct usb_endpoint_descriptor *desc,
const struct usb_ss_ep_comp_descriptor *comp_desc,
bool ignore, bool restore)
{
struct dwc3 *dwc = dep->dwc;
u32 reg;
int ret;
dwc3_trace(trace_dwc3_gadget, "Enabling %s", dep->name);
if (!(dep->flags & DWC3_EP_ENABLED)) {
ret = dwc3_gadget_start_config(dwc, dep);
if (ret)
return ret;
}
ret = dwc3_gadget_set_ep_config(dwc, dep, desc, comp_desc, ignore,
restore);
if (ret)
return ret;
if (!(dep->flags & DWC3_EP_ENABLED)) {
struct dwc3_trb *trb_st_hw;
struct dwc3_trb *trb_link;
dep->endpoint.desc = desc;
dep->comp_desc = comp_desc;
dep->type = usb_endpoint_type(desc);
dep->flags |= DWC3_EP_ENABLED;
reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
reg |= DWC3_DALEPENA_EP(dep->number);
dwc3_writel(dwc->regs, DWC3_DALEPENA, reg);
if (!usb_endpoint_xfer_isoc(desc))
return 0;
/* 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;
}
switch (usb_endpoint_type(desc)) {
case USB_ENDPOINT_XFER_CONTROL:
strlcat(dep->name, "-control", sizeof(dep->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->req_queued)) {
dwc3_stop_active_transfer(dwc, dep->number, true);
/* - giveback all requests to gadget driver */
while (!list_empty(&dep->req_queued)) {
req = next_request(&dep->req_queued);
dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
}
}
while (!list_empty(&dep->request_list)) {
req = next_request(&dep->request_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_request_queued(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;
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();
}
if (!req->request.no_interrupt && !chain)
trb->ctrl |= DWC3_TRB_CTRL_IOC;
if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) {
trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
trb->ctrl |= DWC3_TRB_CTRL_CSP;
} else 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->request_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->request_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->request_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->req_queued))
dwc3_prepare_trbs(dep, start_new);
/* req points to the first request which will be sent */
req = next_request(&dep->req_queued);
} else {
dwc3_prepare_trbs(dep, start_new);
/*
* req points to the first request where HWO changed from 0 to 1
*/
req = next_request(&dep->req_queued);
}
if (!req) {
dep->flags |= DWC3_EP_PENDING_REQUEST;
return 0;
}
memset(&params, 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, &params);
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->request_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->request_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->req_queued)) {
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->request_list, list) {
if (r == req)
break;
}
if (r != req) {
list_for_each_entry(r, &dep->req_queued, 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(&params, 0x00, sizeof(params));
if (value) {
if (!protocol && ((dep->direction && dep->flags & DWC3_EP_BUSY) ||
(!list_empty(&dep->req_queued) ||
!list_empty(&dep->request_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, &params);
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, &params);
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) {
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: /* FALLTHROUGH */
case USB_SPEED_UNKNOWN: /* FALTHROUGH */
default:
reg |= DWC3_DSTS_SUPERSPEED;
}
}
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->request_list);
INIT_LIST_HEAD(&dep->req_queued);
}
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 request_list during
* giveback.If any future queued request
* is successfully transferred then we
* will issue UPDATE TRANSFER for all
* request in the request_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->req_queued);
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->req_queued)) {
if (list_empty(&dep->request_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->req_queued))
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(&params, 0, sizeof(params));
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number, cmd, &params);
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(&params, 0, sizeof(params));
ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
DWC3_DEPCMD_CLEARSTALL, &params);
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)
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:
/*
* 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)) {
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.
*/
dwc->gadget_driver->resume(&dwc->gadget);
}
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, u32 buf)
{
struct dwc3_event_buffer *evt;
irqreturn_t ret = IRQ_NONE;
int left;
u32 reg;
evt = dwc->ev_buffs[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(buf), 4);
}
evt->count = 0;
evt->flags &= ~DWC3_EVENT_PENDING;
ret = IRQ_HANDLED;
/* Unmask interrupt */
reg = dwc3_readl(dwc->regs, DWC3_GEVNTSIZ(buf));
reg &= ~DWC3_GEVNTSIZ_INTMASK;
dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), 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;
int i;
spin_lock_irqsave(&dwc->lock, flags);
for (i = 0; i < dwc->num_event_buffers; i++)
ret |= dwc3_process_event_buf(dwc, i);
spin_unlock_irqrestore(&dwc->lock, flags);
return ret;
}
static irqreturn_t dwc3_check_event_buf(struct dwc3 *dwc, u32 buf)
{
struct dwc3_event_buffer *evt;
u32 count;
u32 reg;
evt = dwc->ev_buffs[buf];
count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(buf));
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(buf));
reg |= DWC3_GEVNTSIZ_INTMASK;
dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(buf), reg);
return IRQ_WAKE_THREAD;
}
static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
{
struct dwc3 *dwc = _dwc;
int i;
irqreturn_t ret = IRQ_NONE;
for (i = 0; i < dwc->num_event_buffers; i++) {
irqreturn_t status;
status = dwc3_check_event_buf(dwc, i);
if (status == IRQ_WAKE_THREAD)
ret = status;
}
return ret;
}
/**
* 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;
}
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