274 lines
6.3 KiB
C
274 lines
6.3 KiB
C
/*
|
|
* omap-usb2.c - USB PHY, talking to musb controller in OMAP.
|
|
*
|
|
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Author: Kishon Vijay Abraham I <kishon@ti.com>
|
|
*
|
|
* 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/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of.h>
|
|
#include <linux/io.h>
|
|
#include <linux/usb/omap_usb.h>
|
|
#include <linux/usb/phy_companion.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/usb/omap_control_usb.h>
|
|
|
|
/**
|
|
* omap_usb2_set_comparator - links the comparator present in the sytem with
|
|
* this phy
|
|
* @comparator - the companion phy(comparator) for this phy
|
|
*
|
|
* The phy companion driver should call this API passing the phy_companion
|
|
* filled with set_vbus and start_srp to be used by usb phy.
|
|
*
|
|
* For use by phy companion driver
|
|
*/
|
|
int omap_usb2_set_comparator(struct phy_companion *comparator)
|
|
{
|
|
struct omap_usb *phy;
|
|
struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2);
|
|
|
|
if (IS_ERR(x))
|
|
return -ENODEV;
|
|
|
|
phy = phy_to_omapusb(x);
|
|
phy->comparator = comparator;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
|
|
|
|
static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
|
|
{
|
|
struct omap_usb *phy = phy_to_omapusb(otg->phy);
|
|
|
|
if (!phy->comparator)
|
|
return -ENODEV;
|
|
|
|
return phy->comparator->set_vbus(phy->comparator, enabled);
|
|
}
|
|
|
|
static int omap_usb_start_srp(struct usb_otg *otg)
|
|
{
|
|
struct omap_usb *phy = phy_to_omapusb(otg->phy);
|
|
|
|
if (!phy->comparator)
|
|
return -ENODEV;
|
|
|
|
return phy->comparator->start_srp(phy->comparator);
|
|
}
|
|
|
|
static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
|
|
{
|
|
struct usb_phy *phy = otg->phy;
|
|
|
|
otg->host = host;
|
|
if (!host)
|
|
phy->state = OTG_STATE_UNDEFINED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_usb_set_peripheral(struct usb_otg *otg,
|
|
struct usb_gadget *gadget)
|
|
{
|
|
struct usb_phy *phy = otg->phy;
|
|
|
|
otg->gadget = gadget;
|
|
if (!gadget)
|
|
phy->state = OTG_STATE_UNDEFINED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_usb2_suspend(struct usb_phy *x, int suspend)
|
|
{
|
|
u32 ret;
|
|
struct omap_usb *phy = phy_to_omapusb(x);
|
|
|
|
if (suspend && !phy->is_suspended) {
|
|
omap_control_usb_phy_power(phy->control_dev, 0);
|
|
pm_runtime_put_sync(phy->dev);
|
|
phy->is_suspended = 1;
|
|
} else if (!suspend && phy->is_suspended) {
|
|
ret = pm_runtime_get_sync(phy->dev);
|
|
if (ret < 0) {
|
|
dev_err(phy->dev, "get_sync failed with err %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
omap_control_usb_phy_power(phy->control_dev, 1);
|
|
phy->is_suspended = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_usb2_probe(struct platform_device *pdev)
|
|
{
|
|
struct omap_usb *phy;
|
|
struct usb_otg *otg;
|
|
|
|
phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
|
|
if (!phy) {
|
|
dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
|
|
if (!otg) {
|
|
dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
phy->dev = &pdev->dev;
|
|
|
|
phy->phy.dev = phy->dev;
|
|
phy->phy.label = "omap-usb2";
|
|
phy->phy.set_suspend = omap_usb2_suspend;
|
|
phy->phy.otg = otg;
|
|
phy->phy.type = USB_PHY_TYPE_USB2;
|
|
|
|
phy->control_dev = omap_get_control_dev();
|
|
if (IS_ERR(phy->control_dev)) {
|
|
dev_dbg(&pdev->dev, "Failed to get control device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
phy->is_suspended = 1;
|
|
omap_control_usb_phy_power(phy->control_dev, 0);
|
|
|
|
otg->set_host = omap_usb_set_host;
|
|
otg->set_peripheral = omap_usb_set_peripheral;
|
|
otg->set_vbus = omap_usb_set_vbus;
|
|
otg->start_srp = omap_usb_start_srp;
|
|
otg->phy = &phy->phy;
|
|
|
|
phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
|
|
if (IS_ERR(phy->wkupclk)) {
|
|
dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
|
|
return PTR_ERR(phy->wkupclk);
|
|
}
|
|
clk_prepare(phy->wkupclk);
|
|
|
|
phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
|
|
if (IS_ERR(phy->optclk))
|
|
dev_vdbg(&pdev->dev, "unable to get refclk960m\n");
|
|
else
|
|
clk_prepare(phy->optclk);
|
|
|
|
usb_add_phy_dev(&phy->phy);
|
|
|
|
platform_set_drvdata(pdev, phy);
|
|
|
|
pm_runtime_enable(phy->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_usb2_remove(struct platform_device *pdev)
|
|
{
|
|
struct omap_usb *phy = platform_get_drvdata(pdev);
|
|
|
|
clk_unprepare(phy->wkupclk);
|
|
if (!IS_ERR(phy->optclk))
|
|
clk_unprepare(phy->optclk);
|
|
usb_remove_phy(&phy->phy);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
|
|
static int omap_usb2_runtime_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct omap_usb *phy = platform_get_drvdata(pdev);
|
|
|
|
clk_disable(phy->wkupclk);
|
|
if (!IS_ERR(phy->optclk))
|
|
clk_disable(phy->optclk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_usb2_runtime_resume(struct device *dev)
|
|
{
|
|
u32 ret = 0;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct omap_usb *phy = platform_get_drvdata(pdev);
|
|
|
|
ret = clk_enable(phy->wkupclk);
|
|
if (ret < 0) {
|
|
dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
|
|
goto err0;
|
|
}
|
|
|
|
if (!IS_ERR(phy->optclk)) {
|
|
ret = clk_enable(phy->optclk);
|
|
if (ret < 0) {
|
|
dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
|
|
goto err1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err1:
|
|
clk_disable(phy->wkupclk);
|
|
|
|
err0:
|
|
return ret;
|
|
}
|
|
|
|
static const struct dev_pm_ops omap_usb2_pm_ops = {
|
|
SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
|
|
NULL)
|
|
};
|
|
|
|
#define DEV_PM_OPS (&omap_usb2_pm_ops)
|
|
#else
|
|
#define DEV_PM_OPS NULL
|
|
#endif
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id omap_usb2_id_table[] = {
|
|
{ .compatible = "ti,omap-usb2" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
|
|
#endif
|
|
|
|
static struct platform_driver omap_usb2_driver = {
|
|
.probe = omap_usb2_probe,
|
|
.remove = omap_usb2_remove,
|
|
.driver = {
|
|
.name = "omap-usb2",
|
|
.owner = THIS_MODULE,
|
|
.pm = DEV_PM_OPS,
|
|
.of_match_table = of_match_ptr(omap_usb2_id_table),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(omap_usb2_driver);
|
|
|
|
MODULE_ALIAS("platform: omap_usb2");
|
|
MODULE_AUTHOR("Texas Instruments Inc.");
|
|
MODULE_DESCRIPTION("OMAP USB2 phy driver");
|
|
MODULE_LICENSE("GPL v2");
|