/*
* omap-control-usb.c - The USB part of control module.
*
* Copyright (C) 2013 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/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/usb/omap_control_usb.h>
static struct omap_control_usb *control_usb;
/**
* omap_get_control_dev - returns the device pointer for this control device
*
* This API should be called to get the device pointer for this control
* module device. This device pointer should be used for called other
* exported API's in this driver.
*
* To be used by PHY driver and glue driver.
*/
struct device *omap_get_control_dev(void)
{
if (!control_usb)
return ERR_PTR(-ENODEV);
return control_usb->dev;
}
EXPORT_SYMBOL_GPL(omap_get_control_dev);
/**
* omap_control_usb3_phy_power - power on/off the serializer using control
* module
* @dev: the control module device
* @on: 0 to off and 1 to on based on powering on or off the PHY
*
* usb3 PHY driver should call this API to power on or off the PHY.
*/
void omap_control_usb3_phy_power(struct device *dev, bool on)
{
u32 val;
unsigned long rate;
struct omap_control_usb *control_usb = dev_get_drvdata(dev);
if (control_usb->type != OMAP_CTRL_DEV_TYPE2)
return;
rate = clk_get_rate(control_usb->sys_clk);
rate = rate/1000000;
val = readl(control_usb->phy_power);
if (on) {
val &= ~(OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK |
OMAP_CTRL_USB_PWRCTL_CLK_FREQ_MASK);
val |= OMAP_CTRL_USB3_PHY_TX_RX_POWERON <<
OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
val |= rate << OMAP_CTRL_USB_PWRCTL_CLK_FREQ_SHIFT;
} else {
val &= ~OMAP_CTRL_USB_PWRCTL_CLK_CMD_MASK;
val |= OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF <<
OMAP_CTRL_USB_PWRCTL_CLK_CMD_SHIFT;
}
writel(val, control_usb->phy_power);
}
EXPORT_SYMBOL_GPL(omap_control_usb3_phy_power);
/**
* omap_control_usb_phy_power - power on/off the phy using control module reg
* @dev: the control module device
* @on: 0 or 1, based on powering on or off the PHY
*/
void omap_control_usb_phy_power(struct device *dev, int on)
{
u32 val;
struct omap_control_usb *control_usb = dev_get_drvdata(dev);
val = readl(control_usb->dev_conf);
if (on)
val &= ~OMAP_CTRL_DEV_PHY_PD;
else
val |= OMAP_CTRL_DEV_PHY_PD;
writel(val, control_usb->dev_conf);
}
EXPORT_SYMBOL_GPL(omap_control_usb_phy_power);
/**
* omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
* @ctrl_usb: struct omap_control_usb *
*
* Writes to the mailbox register to notify the usb core that a usb
* device has been connected.
*/
static void omap_control_usb_host_mode(struct omap_control_usb *ctrl_usb)
{
u32 val;
val = readl(ctrl_usb->otghs_control);
val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
writel(val, ctrl_usb->otghs_control);
}
/**
* omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
* impedance
* @ctrl_usb: struct omap_control_usb *
*
* Writes to the mailbox register to notify the usb core that it has been
* connected to a usb host.
*/
static void omap_control_usb_device_mode(struct omap_control_usb *ctrl_usb)
{
u32 val;
val = readl(ctrl_usb->otghs_control);
val &= ~OMAP_CTRL_DEV_SESSEND;
val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
OMAP_CTRL_DEV_VBUSVALID;
writel(val, ctrl_usb->otghs_control);
}
/**
* omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
* impedance
* @ctrl_usb: struct omap_control_usb *
*
* Writes to the mailbox register to notify the usb core it's now in
* disconnected state.
*/
static void omap_control_usb_set_sessionend(struct omap_control_usb *ctrl_usb)
{
u32 val;
val = readl(ctrl_usb->otghs_control);
val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
writel(val, ctrl_usb->otghs_control);
}
/**
* omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
* or device mode or to denote disconnected state
* @dev: the control module device
* @mode: The mode to which usb should be configured
*
* This is an API to write to the mailbox register to notify the usb core that
* a usb device has been connected.
*/
void omap_control_usb_set_mode(struct device *dev,
enum omap_control_usb_mode mode)
{
struct omap_control_usb *ctrl_usb;
if (IS_ERR(dev) || control_usb->type != OMAP_CTRL_DEV_TYPE1)
return;
ctrl_usb = dev_get_drvdata(dev);
switch (mode) {
case USB_MODE_HOST:
omap_control_usb_host_mode(ctrl_usb);
break;
case USB_MODE_DEVICE:
omap_control_usb_device_mode(ctrl_usb);
break;
case USB_MODE_DISCONNECT:
omap_control_usb_set_sessionend(ctrl_usb);
break;
default:
dev_vdbg(dev, "invalid omap control usb mode\n");
}
}
EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);
static int omap_control_usb_probe(struct platform_device *pdev)
{
struct resource *res;
struct device_node *np = pdev->dev.of_node;
struct omap_control_usb_platform_data *pdata = pdev->dev.platform_data;
control_usb = devm_kzalloc(&pdev->dev, sizeof(*control_usb),
GFP_KERNEL);
if (!control_usb) {
dev_err(&pdev->dev, "unable to alloc memory for control usb\n");
return -ENOMEM;
}
if (np) {
of_property_read_u32(np, "ti,type", &control_usb->type);
} else if (pdata) {
control_usb->type = pdata->type;
} else {
dev_err(&pdev->dev, "no pdata present\n");
return -EINVAL;
}
control_usb->dev = &pdev->dev;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"control_dev_conf");
control_usb->dev_conf = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(control_usb->dev_conf))
return PTR_ERR(control_usb->dev_conf);
if (control_usb->type == OMAP_CTRL_DEV_TYPE1) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"otghs_control");
control_usb->otghs_control = devm_ioremap_resource(
&pdev->dev, res);
if (IS_ERR(control_usb->otghs_control))
return PTR_ERR(control_usb->otghs_control);
}
if (control_usb->type == OMAP_CTRL_DEV_TYPE2) {
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"phy_power_usb");
control_usb->phy_power = devm_ioremap_resource(
&pdev->dev, res);
if (IS_ERR(control_usb->phy_power))
return PTR_ERR(control_usb->phy_power);
control_usb->sys_clk = devm_clk_get(control_usb->dev,
"sys_clkin");
if (IS_ERR(control_usb->sys_clk)) {
pr_err("%s: unable to get sys_clkin\n", __func__);
return -EINVAL;
}
}
dev_set_drvdata(control_usb->dev, control_usb);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id omap_control_usb_id_table[] = {
{ .compatible = "ti,omap-control-usb" },
{}
};
MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
#endif
static struct platform_driver omap_control_usb_driver = {
.probe = omap_control_usb_probe,
.driver = {
.name = "omap-control-usb",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(omap_control_usb_id_table),
},
};
static int __init omap_control_usb_init(void)
{
return platform_driver_register(&omap_control_usb_driver);
}
subsys_initcall(omap_control_usb_init);
static void __exit omap_control_usb_exit(void)
{
platform_driver_unregister(&omap_control_usb_driver);
}
module_exit(omap_control_usb_exit);
MODULE_ALIAS("platform: omap_control_usb");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("OMAP Control Module USB Driver");
MODULE_LICENSE("GPL v2");
