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/*
* Copyright (C) 2010 ST-Ericsson AB
* Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
*
* Based on omap2430.c
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include "musb_core.h"
struct ux500_glue {
struct device *dev;
struct platform_device *musb;
struct clk *clk;
};
#define glue_to_musb(g) platform_get_drvdata(g->musb)
static irqreturn_t ux500_musb_interrupt(int irq, void *__hci)
{
unsigned long flags;
irqreturn_t retval = IRQ_NONE;
struct musb *musb = __hci;
spin_lock_irqsave(&musb->lock, flags);
musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
if (musb->int_usb || musb->int_tx || musb->int_rx)
retval = musb_interrupt(musb);
spin_unlock_irqrestore(&musb->lock, flags);
return retval;
}
static int ux500_musb_init(struct musb *musb)
{
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (IS_ERR_OR_NULL(musb->xceiv)) {
pr_err("HS USB OTG: no transceiver configured\n");
return -EPROBE_DEFER;
}
musb->isr = ux500_musb_interrupt;
return 0;
}
static int ux500_musb_exit(struct musb *musb)
{
usb_put_phy(musb->xceiv);
return 0;
}
static const struct musb_platform_ops ux500_ops = {
.init = ux500_musb_init,
.exit = ux500_musb_exit,
};
static int ux500_probe(struct platform_device *pdev)
{
struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
struct platform_device *musb;
struct ux500_glue *glue;
struct clk *clk;
int ret = -ENOMEM;
glue = kzalloc(sizeof(*glue), GFP_KERNEL);
if (!glue) {
dev_err(&pdev->dev, "failed to allocate glue context\n");
goto err0;
}
musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
if (!musb) {
dev_err(&pdev->dev, "failed to allocate musb device\n");
goto err1;
}
clk = clk_get(&pdev->dev, "usb");
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
ret = PTR_ERR(clk);
goto err3;
}
ret = clk_prepare_enable(clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable clock\n");
goto err4;
}
musb->dev.parent = &pdev->dev;
musb->dev.dma_mask = pdev->dev.dma_mask;
musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
glue->dev = &pdev->dev;
glue->musb = musb;
glue->clk = clk;
pdata->platform_ops = &ux500_ops;
platform_set_drvdata(pdev, glue);
ret = platform_device_add_resources(musb, pdev->resource,
pdev->num_resources);
if (ret) {
dev_err(&pdev->dev, "failed to add resources\n");
goto err5;
}
ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
if (ret) {
dev_err(&pdev->dev, "failed to add platform_data\n");
goto err5;
}
ret = platform_device_add(musb);
if (ret) {
dev_err(&pdev->dev, "failed to register musb device\n");
goto err5;
}
return 0;
err5:
clk_disable_unprepare(clk);
err4:
clk_put(clk);
err3:
platform_device_put(musb);
err1:
kfree(glue);
err0:
return ret;
}
static int ux500_remove(struct platform_device *pdev)
{
struct ux500_glue *glue = platform_get_drvdata(pdev);
platform_device_unregister(glue->musb);
clk_disable_unprepare(glue->clk);
clk_put(glue->clk);
kfree(glue);
return 0;
}
#ifdef CONFIG_PM
static int ux500_suspend(struct device *dev)
{
struct ux500_glue *glue = dev_get_drvdata(dev);
struct musb *musb = glue_to_musb(glue);
usb_phy_set_suspend(musb->xceiv, 1);
clk_disable_unprepare(glue->clk);
return 0;
}
static int ux500_resume(struct device *dev)
{
struct ux500_glue *glue = dev_get_drvdata(dev);
struct musb *musb = glue_to_musb(glue);
int ret;
ret = clk_prepare_enable(glue->clk);
if (ret) {
dev_err(dev, "failed to enable clock\n");
return ret;
}
usb_phy_set_suspend(musb->xceiv, 0);
return 0;
}
static const struct dev_pm_ops ux500_pm_ops = {
.suspend = ux500_suspend,
.resume = ux500_resume,
};
#define DEV_PM_OPS (&ux500_pm_ops)
#else
#define DEV_PM_OPS NULL
#endif
static struct platform_driver ux500_driver = {
.probe = ux500_probe,
.remove = ux500_remove,
.driver = {
.name = "musb-ux500",
.pm = DEV_PM_OPS,
},
};
MODULE_DESCRIPTION("UX500 MUSB Glue Layer");
MODULE_AUTHOR("Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>");
MODULE_LICENSE("GPL v2");
module_platform_driver(ux500_driver);
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