linux/drivers/phy/phy-omap-usb2.c
Roger Quadros 478b6c7436 usb: phy: omap-usb2: Don't use omap_get_control_dev()
omap_get_control_dev() is being deprecated as it doesn't support
multiple instances. As control device is present only from OMAP4
onwards which supports DT only, we use phandles to get the
reference to the control device.

As we don't support non-DT boot, we just bail out on probe
if device node is not present.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-03 15:47:30 -07:00

325 lines
7.5 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>
#include <linux/phy/phy.h>
#include <linux/of_platform.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)
{
struct omap_usb *phy = phy_to_omapusb(x);
int ret;
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_usb_power_off(struct phy *x)
{
struct omap_usb *phy = phy_get_drvdata(x);
omap_control_usb_phy_power(phy->control_dev, 0);
return 0;
}
static int omap_usb_power_on(struct phy *x)
{
struct omap_usb *phy = phy_get_drvdata(x);
omap_control_usb_phy_power(phy->control_dev, 1);
return 0;
}
static struct phy_ops ops = {
.power_on = omap_usb_power_on,
.power_off = omap_usb_power_off,
.owner = THIS_MODULE,
};
static int omap_usb2_probe(struct platform_device *pdev)
{
struct omap_usb *phy;
struct phy *generic_phy;
struct phy_provider *phy_provider;
struct usb_otg *otg;
struct device_node *node = pdev->dev.of_node;
struct device_node *control_node;
struct platform_device *control_pdev;
if (!node)
return -EINVAL;
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_provider = devm_of_phy_provider_register(phy->dev,
of_phy_simple_xlate);
if (IS_ERR(phy_provider))
return PTR_ERR(phy_provider);
control_node = of_parse_phandle(node, "ctrl-module", 0);
if (!control_node) {
dev_err(&pdev->dev, "Failed to get control device phandle\n");
return -EINVAL;
}
control_pdev = of_find_device_by_node(control_node);
if (!control_pdev) {
dev_err(&pdev->dev, "Failed to get control device\n");
return -EINVAL;
}
phy->control_dev = &control_pdev->dev;
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;
platform_set_drvdata(pdev, phy);
pm_runtime_enable(phy->dev);
generic_phy = devm_phy_create(phy->dev, &ops, NULL);
if (IS_ERR(generic_phy))
return PTR_ERR(generic_phy);
phy_set_drvdata(generic_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);
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)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_usb *phy = platform_get_drvdata(pdev);
int ret;
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");