575 lines
12 KiB
C
575 lines
12 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* Cadence USBSS and USBSSP DRD Driver.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2018-2019 Cadence.
|
||
|
|
* Copyright (C) 2017-2018 NXP
|
||
|
|
* Copyright (C) 2019 Texas Instruments
|
||
|
|
*
|
||
|
|
* Author: Peter Chen <peter.chen@nxp.com>
|
||
|
|
* Pawel Laszczak <pawell@cadence.com>
|
||
|
|
* Roger Quadros <rogerq@ti.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/dma-mapping.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/platform_device.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/pm_runtime.h>
|
||
|
|
|
||
|
|
#include "core.h"
|
||
|
|
#include "host-export.h"
|
||
|
|
#include "drd.h"
|
||
|
|
|
||
|
|
static int cdns_idle_init(struct cdns *cdns);
|
||
|
|
|
||
|
|
static int cdns_role_start(struct cdns *cdns, enum usb_role role)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (WARN_ON(role > USB_ROLE_DEVICE))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
mutex_lock(&cdns->mutex);
|
||
|
|
cdns->role = role;
|
||
|
|
mutex_unlock(&cdns->mutex);
|
||
|
|
|
||
|
|
if (!cdns->roles[role])
|
||
|
|
return -ENXIO;
|
||
|
|
|
||
|
|
if (cdns->roles[role]->state == CDNS_ROLE_STATE_ACTIVE)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
mutex_lock(&cdns->mutex);
|
||
|
|
ret = cdns->roles[role]->start(cdns);
|
||
|
|
if (!ret)
|
||
|
|
cdns->roles[role]->state = CDNS_ROLE_STATE_ACTIVE;
|
||
|
|
mutex_unlock(&cdns->mutex);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void cdns_role_stop(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
enum usb_role role = cdns->role;
|
||
|
|
|
||
|
|
if (WARN_ON(role > USB_ROLE_DEVICE))
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (cdns->roles[role]->state == CDNS_ROLE_STATE_INACTIVE)
|
||
|
|
return;
|
||
|
|
|
||
|
|
mutex_lock(&cdns->mutex);
|
||
|
|
cdns->roles[role]->stop(cdns);
|
||
|
|
cdns->roles[role]->state = CDNS_ROLE_STATE_INACTIVE;
|
||
|
|
mutex_unlock(&cdns->mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void cdns_exit_roles(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
cdns_role_stop(cdns);
|
||
|
|
cdns_drd_exit(cdns);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cdns_core_init_role - initialize role of operation
|
||
|
|
* @cdns: Pointer to cdns structure
|
||
|
|
*
|
||
|
|
* Returns 0 on success otherwise negative errno
|
||
|
|
*/
|
||
|
|
static int cdns_core_init_role(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
struct device *dev = cdns->dev;
|
||
|
|
enum usb_dr_mode best_dr_mode;
|
||
|
|
enum usb_dr_mode dr_mode;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
dr_mode = usb_get_dr_mode(dev);
|
||
|
|
cdns->role = USB_ROLE_NONE;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If driver can't read mode by means of usb_get_dr_mode function then
|
||
|
|
* chooses mode according with Kernel configuration. This setting
|
||
|
|
* can be restricted later depending on strap pin configuration.
|
||
|
|
*/
|
||
|
|
if (dr_mode == USB_DR_MODE_UNKNOWN) {
|
||
|
|
if (cdns->version == CDNSP_CONTROLLER_V2) {
|
||
|
|
if (IS_ENABLED(CONFIG_USB_CDNSP_HOST) &&
|
||
|
|
IS_ENABLED(CONFIG_USB_CDNSP_GADGET))
|
||
|
|
dr_mode = USB_DR_MODE_OTG;
|
||
|
|
else if (IS_ENABLED(CONFIG_USB_CDNSP_HOST))
|
||
|
|
dr_mode = USB_DR_MODE_HOST;
|
||
|
|
else if (IS_ENABLED(CONFIG_USB_CDNSP_GADGET))
|
||
|
|
dr_mode = USB_DR_MODE_PERIPHERAL;
|
||
|
|
} else {
|
||
|
|
if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
|
||
|
|
IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
|
||
|
|
dr_mode = USB_DR_MODE_OTG;
|
||
|
|
else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
|
||
|
|
dr_mode = USB_DR_MODE_HOST;
|
||
|
|
else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
|
||
|
|
dr_mode = USB_DR_MODE_PERIPHERAL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* At this point cdns->dr_mode contains strap configuration.
|
||
|
|
* Driver try update this setting considering kernel configuration
|
||
|
|
*/
|
||
|
|
best_dr_mode = cdns->dr_mode;
|
||
|
|
|
||
|
|
ret = cdns_idle_init(cdns);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (dr_mode == USB_DR_MODE_OTG) {
|
||
|
|
best_dr_mode = cdns->dr_mode;
|
||
|
|
} else if (cdns->dr_mode == USB_DR_MODE_OTG) {
|
||
|
|
best_dr_mode = dr_mode;
|
||
|
|
} else if (cdns->dr_mode != dr_mode) {
|
||
|
|
dev_err(dev, "Incorrect DRD configuration\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
dr_mode = best_dr_mode;
|
||
|
|
|
||
|
|
if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
|
||
|
|
if ((cdns->version == CDNSP_CONTROLLER_V2 &&
|
||
|
|
IS_ENABLED(CONFIG_USB_CDNSP_HOST)) ||
|
||
|
|
(cdns->version < CDNSP_CONTROLLER_V2 &&
|
||
|
|
IS_ENABLED(CONFIG_USB_CDNS3_HOST)))
|
||
|
|
ret = cdns_host_init(cdns);
|
||
|
|
else
|
||
|
|
ret = -ENXIO;
|
||
|
|
|
||
|
|
if (ret) {
|
||
|
|
dev_err(dev, "Host initialization failed with %d\n",
|
||
|
|
ret);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
|
||
|
|
if (cdns->gadget_init)
|
||
|
|
ret = cdns->gadget_init(cdns);
|
||
|
|
else
|
||
|
|
ret = -ENXIO;
|
||
|
|
|
||
|
|
if (ret) {
|
||
|
|
dev_err(dev, "Device initialization failed with %d\n",
|
||
|
|
ret);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
cdns->dr_mode = dr_mode;
|
||
|
|
|
||
|
|
ret = cdns_drd_update_mode(cdns);
|
||
|
|
if (ret)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
/* Initialize idle role to start with */
|
||
|
|
ret = cdns_role_start(cdns, USB_ROLE_NONE);
|
||
|
|
if (ret)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
switch (cdns->dr_mode) {
|
||
|
|
case USB_DR_MODE_OTG:
|
||
|
|
ret = cdns_hw_role_switch(cdns);
|
||
|
|
if (ret)
|
||
|
|
goto err;
|
||
|
|
break;
|
||
|
|
case USB_DR_MODE_PERIPHERAL:
|
||
|
|
ret = cdns_role_start(cdns, USB_ROLE_DEVICE);
|
||
|
|
if (ret)
|
||
|
|
goto err;
|
||
|
|
break;
|
||
|
|
case USB_DR_MODE_HOST:
|
||
|
|
ret = cdns_role_start(cdns, USB_ROLE_HOST);
|
||
|
|
if (ret)
|
||
|
|
goto err;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
ret = -EINVAL;
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
err:
|
||
|
|
cdns_exit_roles(cdns);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cdns_hw_role_state_machine - role switch state machine based on hw events.
|
||
|
|
* @cdns: Pointer to controller structure.
|
||
|
|
*
|
||
|
|
* Returns next role to be entered based on hw events.
|
||
|
|
*/
|
||
|
|
static enum usb_role cdns_hw_role_state_machine(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
enum usb_role role = USB_ROLE_NONE;
|
||
|
|
int id, vbus;
|
||
|
|
|
||
|
|
if (cdns->dr_mode != USB_DR_MODE_OTG) {
|
||
|
|
if (cdns_is_host(cdns))
|
||
|
|
role = USB_ROLE_HOST;
|
||
|
|
if (cdns_is_device(cdns))
|
||
|
|
role = USB_ROLE_DEVICE;
|
||
|
|
|
||
|
|
return role;
|
||
|
|
}
|
||
|
|
|
||
|
|
id = cdns_get_id(cdns);
|
||
|
|
vbus = cdns_get_vbus(cdns);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Role change state machine
|
||
|
|
* Inputs: ID, VBUS
|
||
|
|
* Previous state: cdns->role
|
||
|
|
* Next state: role
|
||
|
|
*/
|
||
|
|
role = cdns->role;
|
||
|
|
|
||
|
|
switch (role) {
|
||
|
|
case USB_ROLE_NONE:
|
||
|
|
/*
|
||
|
|
* Driver treats USB_ROLE_NONE synonymous to IDLE state from
|
||
|
|
* controller specification.
|
||
|
|
*/
|
||
|
|
if (!id)
|
||
|
|
role = USB_ROLE_HOST;
|
||
|
|
else if (vbus)
|
||
|
|
role = USB_ROLE_DEVICE;
|
||
|
|
break;
|
||
|
|
case USB_ROLE_HOST: /* from HOST, we can only change to NONE */
|
||
|
|
if (id)
|
||
|
|
role = USB_ROLE_NONE;
|
||
|
|
break;
|
||
|
|
case USB_ROLE_DEVICE: /* from GADGET, we can only change to NONE*/
|
||
|
|
if (!vbus)
|
||
|
|
role = USB_ROLE_NONE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
|
||
|
|
|
||
|
|
return role;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int cdns_idle_role_start(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void cdns_idle_role_stop(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
/* Program Lane swap and bring PHY out of RESET */
|
||
|
|
phy_reset(cdns->usb3_phy);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int cdns_idle_init(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
struct cdns_role_driver *rdrv;
|
||
|
|
|
||
|
|
rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
|
||
|
|
if (!rdrv)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
rdrv->start = cdns_idle_role_start;
|
||
|
|
rdrv->stop = cdns_idle_role_stop;
|
||
|
|
rdrv->state = CDNS_ROLE_STATE_INACTIVE;
|
||
|
|
rdrv->suspend = NULL;
|
||
|
|
rdrv->resume = NULL;
|
||
|
|
rdrv->name = "idle";
|
||
|
|
|
||
|
|
cdns->roles[USB_ROLE_NONE] = rdrv;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cdns_hw_role_switch - switch roles based on HW state
|
||
|
|
* @cdns: controller
|
||
|
|
*/
|
||
|
|
int cdns_hw_role_switch(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
enum usb_role real_role, current_role;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
/* Depends on role switch class */
|
||
|
|
if (cdns->role_sw)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
pm_runtime_get_sync(cdns->dev);
|
||
|
|
|
||
|
|
current_role = cdns->role;
|
||
|
|
real_role = cdns_hw_role_state_machine(cdns);
|
||
|
|
|
||
|
|
/* Do nothing if nothing changed */
|
||
|
|
if (current_role == real_role)
|
||
|
|
goto exit;
|
||
|
|
|
||
|
|
cdns_role_stop(cdns);
|
||
|
|
|
||
|
|
dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);
|
||
|
|
|
||
|
|
ret = cdns_role_start(cdns, real_role);
|
||
|
|
if (ret) {
|
||
|
|
/* Back to current role */
|
||
|
|
dev_err(cdns->dev, "set %d has failed, back to %d\n",
|
||
|
|
real_role, current_role);
|
||
|
|
ret = cdns_role_start(cdns, current_role);
|
||
|
|
if (ret)
|
||
|
|
dev_err(cdns->dev, "back to %d failed too\n",
|
||
|
|
current_role);
|
||
|
|
}
|
||
|
|
exit:
|
||
|
|
pm_runtime_put_sync(cdns->dev);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cdns_role_get - get current role of controller.
|
||
|
|
*
|
||
|
|
* @sw: pointer to USB role switch structure
|
||
|
|
*
|
||
|
|
* Returns role
|
||
|
|
*/
|
||
|
|
static enum usb_role cdns_role_get(struct usb_role_switch *sw)
|
||
|
|
{
|
||
|
|
struct cdns *cdns = usb_role_switch_get_drvdata(sw);
|
||
|
|
|
||
|
|
return cdns->role;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cdns_role_set - set current role of controller.
|
||
|
|
*
|
||
|
|
* @sw: pointer to USB role switch structure
|
||
|
|
* @role: the previous role
|
||
|
|
* Handles below events:
|
||
|
|
* - Role switch for dual-role devices
|
||
|
|
* - USB_ROLE_GADGET <--> USB_ROLE_NONE for peripheral-only devices
|
||
|
|
*/
|
||
|
|
static int cdns_role_set(struct usb_role_switch *sw, enum usb_role role)
|
||
|
|
{
|
||
|
|
struct cdns *cdns = usb_role_switch_get_drvdata(sw);
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
pm_runtime_get_sync(cdns->dev);
|
||
|
|
|
||
|
|
if (cdns->role == role)
|
||
|
|
goto pm_put;
|
||
|
|
|
||
|
|
if (cdns->dr_mode == USB_DR_MODE_HOST) {
|
||
|
|
switch (role) {
|
||
|
|
case USB_ROLE_NONE:
|
||
|
|
case USB_ROLE_HOST:
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
goto pm_put;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (cdns->dr_mode == USB_DR_MODE_PERIPHERAL) {
|
||
|
|
switch (role) {
|
||
|
|
case USB_ROLE_NONE:
|
||
|
|
case USB_ROLE_DEVICE:
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
goto pm_put;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
cdns_role_stop(cdns);
|
||
|
|
ret = cdns_role_start(cdns, role);
|
||
|
|
if (ret)
|
||
|
|
dev_err(cdns->dev, "set role %d has failed\n", role);
|
||
|
|
|
||
|
|
pm_put:
|
||
|
|
pm_runtime_put_sync(cdns->dev);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cdns_wakeup_irq - interrupt handler for wakeup events
|
||
|
|
* @irq: irq number for cdns3/cdnsp core device
|
||
|
|
* @data: structure of cdns
|
||
|
|
*
|
||
|
|
* Returns IRQ_HANDLED or IRQ_NONE
|
||
|
|
*/
|
||
|
|
static irqreturn_t cdns_wakeup_irq(int irq, void *data)
|
||
|
|
{
|
||
|
|
struct cdns *cdns = data;
|
||
|
|
|
||
|
|
if (cdns->in_lpm) {
|
||
|
|
disable_irq_nosync(irq);
|
||
|
|
cdns->wakeup_pending = true;
|
||
|
|
if ((cdns->role == USB_ROLE_HOST) && cdns->host_dev)
|
||
|
|
pm_request_resume(&cdns->host_dev->dev);
|
||
|
|
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
return IRQ_NONE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cdns_init - probe for cdns3/cdnsp core device
|
||
|
|
* @cdns: Pointer to cdns structure.
|
||
|
|
*
|
||
|
|
* Returns 0 on success otherwise negative errno
|
||
|
|
*/
|
||
|
|
int cdns_init(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
struct device *dev = cdns->dev;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
|
||
|
|
if (ret) {
|
||
|
|
dev_err(dev, "error setting dma mask: %d\n", ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_init(&cdns->mutex);
|
||
|
|
|
||
|
|
if (device_property_read_bool(dev, "usb-role-switch")) {
|
||
|
|
struct usb_role_switch_desc sw_desc = { };
|
||
|
|
|
||
|
|
sw_desc.set = cdns_role_set;
|
||
|
|
sw_desc.get = cdns_role_get;
|
||
|
|
sw_desc.allow_userspace_control = true;
|
||
|
|
sw_desc.driver_data = cdns;
|
||
|
|
sw_desc.fwnode = dev->fwnode;
|
||
|
|
|
||
|
|
cdns->role_sw = usb_role_switch_register(dev, &sw_desc);
|
||
|
|
if (IS_ERR(cdns->role_sw)) {
|
||
|
|
dev_warn(dev, "Unable to register Role Switch\n");
|
||
|
|
return PTR_ERR(cdns->role_sw);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (cdns->wakeup_irq) {
|
||
|
|
ret = devm_request_irq(cdns->dev, cdns->wakeup_irq,
|
||
|
|
cdns_wakeup_irq,
|
||
|
|
IRQF_SHARED,
|
||
|
|
dev_name(cdns->dev), cdns);
|
||
|
|
|
||
|
|
if (ret) {
|
||
|
|
dev_err(cdns->dev, "couldn't register wakeup irq handler\n");
|
||
|
|
goto role_switch_unregister;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = cdns_drd_init(cdns);
|
||
|
|
if (ret)
|
||
|
|
goto init_failed;
|
||
|
|
|
||
|
|
ret = cdns_core_init_role(cdns);
|
||
|
|
if (ret)
|
||
|
|
goto init_failed;
|
||
|
|
|
||
|
|
spin_lock_init(&cdns->lock);
|
||
|
|
|
||
|
|
dev_dbg(dev, "Cadence USB3 core: probe succeed\n");
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
init_failed:
|
||
|
|
cdns_drd_exit(cdns);
|
||
|
|
role_switch_unregister:
|
||
|
|
if (cdns->role_sw)
|
||
|
|
usb_role_switch_unregister(cdns->role_sw);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cdns_init);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* cdns_remove - unbind drd driver and clean up
|
||
|
|
* @cdns: Pointer to cdns structure.
|
||
|
|
*
|
||
|
|
* Returns 0 on success otherwise negative errno
|
||
|
|
*/
|
||
|
|
int cdns_remove(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
cdns_exit_roles(cdns);
|
||
|
|
usb_role_switch_unregister(cdns->role_sw);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cdns_remove);
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM_SLEEP
|
||
|
|
int cdns_suspend(struct cdns *cdns)
|
||
|
|
{
|
||
|
|
struct device *dev = cdns->dev;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
if (pm_runtime_status_suspended(dev))
|
||
|
|
pm_runtime_resume(dev);
|
||
|
|
|
||
|
|
if (cdns->roles[cdns->role]->suspend) {
|
||
|
|
spin_lock_irqsave(&cdns->lock, flags);
|
||
|
|
cdns->roles[cdns->role]->suspend(cdns, false);
|
||
|
|
spin_unlock_irqrestore(&cdns->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cdns_suspend);
|
||
|
|
|
||
|
|
int cdns_resume(struct cdns *cdns, u8 set_active)
|
||
|
|
{
|
||
|
|
struct device *dev = cdns->dev;
|
||
|
|
enum usb_role real_role;
|
||
|
|
bool role_changed = false;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
if (cdns_power_is_lost(cdns)) {
|
||
|
|
if (cdns->role_sw) {
|
||
|
|
cdns->role = cdns_role_get(cdns->role_sw);
|
||
|
|
} else {
|
||
|
|
real_role = cdns_hw_role_state_machine(cdns);
|
||
|
|
if (real_role != cdns->role) {
|
||
|
|
ret = cdns_hw_role_switch(cdns);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
role_changed = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!role_changed) {
|
||
|
|
if (cdns->role == USB_ROLE_HOST)
|
||
|
|
ret = cdns_drd_host_on(cdns);
|
||
|
|
else if (cdns->role == USB_ROLE_DEVICE)
|
||
|
|
ret = cdns_drd_gadget_on(cdns);
|
||
|
|
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (cdns->roles[cdns->role]->resume)
|
||
|
|
cdns->roles[cdns->role]->resume(cdns, cdns_power_is_lost(cdns));
|
||
|
|
|
||
|
|
if (set_active) {
|
||
|
|
pm_runtime_disable(dev);
|
||
|
|
pm_runtime_set_active(dev);
|
||
|
|
pm_runtime_enable(dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(cdns_resume);
|
||
|
|
#endif /* CONFIG_PM_SLEEP */
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Peter Chen <peter.chen@nxp.com>");
|
||
|
|
MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
|
||
|
|
MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
|
||
|
|
MODULE_DESCRIPTION("Cadence USBSS and USBSSP DRD Driver");
|
||
|
|
MODULE_LICENSE("GPL");
|