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/*
* Copyright 2012 Freescale Semiconductor, Inc.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/delay.h>
#include "ci13xxx_imx.h"
#define USB_DEV_MAX 4
#define MX25_USB_PHY_CTRL_OFFSET 0x08
#define MX25_BM_EXTERNAL_VBUS_DIVIDER BIT(23)
#define MX53_USB_OTG_PHY_CTRL_0_OFFSET 0x08
#define MX53_USB_UH2_CTRL_OFFSET 0x14
#define MX53_USB_UH3_CTRL_OFFSET 0x18
#define MX53_BM_OVER_CUR_DIS_H1 BIT(5)
#define MX53_BM_OVER_CUR_DIS_OTG BIT(8)
#define MX53_BM_OVER_CUR_DIS_UHx BIT(30)
#define MX6_BM_OVER_CUR_DIS BIT(7)
struct imx_usbmisc {
void __iomem *base;
spinlock_t lock;
struct clk *clk;
struct usbmisc_usb_device usbdev[USB_DEV_MAX];
const struct usbmisc_ops *ops;
};
static struct imx_usbmisc *usbmisc;
static struct usbmisc_usb_device *get_usbdev(struct device *dev)
{
int i, ret;
for (i = 0; i < USB_DEV_MAX; i++) {
if (usbmisc->usbdev[i].dev == dev)
return &usbmisc->usbdev[i];
else if (!usbmisc->usbdev[i].dev)
break;
}
if (i >= USB_DEV_MAX)
return ERR_PTR(-EBUSY);
ret = usbmisc_get_init_data(dev, &usbmisc->usbdev[i]);
if (ret)
return ERR_PTR(ret);
return &usbmisc->usbdev[i];
}
static int usbmisc_imx25_post(struct device *dev)
{
struct usbmisc_usb_device *usbdev;
void __iomem *reg;
unsigned long flags;
u32 val;
usbdev = get_usbdev(dev);
if (IS_ERR(usbdev))
return PTR_ERR(usbdev);
reg = usbmisc->base + MX25_USB_PHY_CTRL_OFFSET;
if (usbdev->evdo) {
spin_lock_irqsave(&usbmisc->lock, flags);
val = readl(reg);
writel(val | MX25_BM_EXTERNAL_VBUS_DIVIDER, reg);
spin_unlock_irqrestore(&usbmisc->lock, flags);
usleep_range(5000, 10000); /* needed to stabilize voltage */
}
return 0;
}
static int usbmisc_imx53_init(struct device *dev)
{
struct usbmisc_usb_device *usbdev;
void __iomem *reg = NULL;
unsigned long flags;
u32 val = 0;
usbdev = get_usbdev(dev);
if (IS_ERR(usbdev))
return PTR_ERR(usbdev);
if (usbdev->disable_oc) {
spin_lock_irqsave(&usbmisc->lock, flags);
switch (usbdev->index) {
case 0:
reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
val = readl(reg) | MX53_BM_OVER_CUR_DIS_OTG;
break;
case 1:
reg = usbmisc->base + MX53_USB_OTG_PHY_CTRL_0_OFFSET;
val = readl(reg) | MX53_BM_OVER_CUR_DIS_H1;
break;
case 2:
reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
break;
case 3:
reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
break;
}
if (reg && val)
writel(val, reg);
spin_unlock_irqrestore(&usbmisc->lock, flags);
}
return 0;
}
static int usbmisc_imx6q_init(struct device *dev)
{
struct usbmisc_usb_device *usbdev;
unsigned long flags;
u32 reg;
usbdev = get_usbdev(dev);
if (IS_ERR(usbdev))
return PTR_ERR(usbdev);
if (usbdev->disable_oc) {
spin_lock_irqsave(&usbmisc->lock, flags);
reg = readl(usbmisc->base + usbdev->index * 4);
writel(reg | MX6_BM_OVER_CUR_DIS,
usbmisc->base + usbdev->index * 4);
spin_unlock_irqrestore(&usbmisc->lock, flags);
}
return 0;
}
static const struct usbmisc_ops imx25_usbmisc_ops = {
.post = usbmisc_imx25_post,
};
static const struct usbmisc_ops imx53_usbmisc_ops = {
.init = usbmisc_imx53_init,
};
static const struct usbmisc_ops imx6q_usbmisc_ops = {
.init = usbmisc_imx6q_init,
};
static const struct of_device_id usbmisc_imx_dt_ids[] = {
{
.compatible = "fsl,imx25-usbmisc",
.data = &imx25_usbmisc_ops,
},
{
.compatible = "fsl,imx53-usbmisc",
.data = &imx53_usbmisc_ops,
},
{
.compatible = "fsl,imx6q-usbmisc",
.data = &imx6q_usbmisc_ops,
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, usbmisc_imx_dt_ids);
static int usbmisc_imx_probe(struct platform_device *pdev)
{
struct resource *res;
struct imx_usbmisc *data;
int ret;
struct of_device_id *tmp_dev;
if (usbmisc)
return -EBUSY;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
spin_lock_init(&data->lock);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(data->base))
return PTR_ERR(data->base);
data->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(data->clk)) {
dev_err(&pdev->dev,
"failed to get clock, err=%ld\n", PTR_ERR(data->clk));
return PTR_ERR(data->clk);
}
ret = clk_prepare_enable(data->clk);
if (ret) {
dev_err(&pdev->dev,
"clk_prepare_enable failed, err=%d\n", ret);
return ret;
}
tmp_dev = (struct of_device_id *)
of_match_device(usbmisc_imx_dt_ids, &pdev->dev);
data->ops = (const struct usbmisc_ops *)tmp_dev->data;
usbmisc = data;
ret = usbmisc_set_ops(data->ops);
if (ret) {
usbmisc = NULL;
clk_disable_unprepare(data->clk);
return ret;
}
return 0;
}
static int usbmisc_imx_remove(struct platform_device *pdev)
{
usbmisc_unset_ops(usbmisc->ops);
clk_disable_unprepare(usbmisc->clk);
usbmisc = NULL;
return 0;
}
static struct platform_driver usbmisc_imx_driver = {
.probe = usbmisc_imx_probe,
.remove = usbmisc_imx_remove,
.driver = {
.name = "usbmisc_imx",
.owner = THIS_MODULE,
.of_match_table = usbmisc_imx_dt_ids,
},
};
module_platform_driver(usbmisc_imx_driver);
MODULE_ALIAS("platform:usbmisc-imx");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("driver for imx usb non-core registers");
MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
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