linux/drivers/phy/phy-stih407-usb.c
Lee Jones f5f35830fb phy: phy-stih407-usb: Use explicit reset_control_get_exclusive() API
We're making all reset line users specify whether their lines are
shared with other IP or they operate them exclusively.  In this case
the line is exclusively used only by this IP, so use the *_exclusive()
API accordingly.

Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2016-07-01 10:52:09 +01:00

181 lines
4.8 KiB
C

/*
* Copyright (C) 2014 STMicroelectronics
*
* STMicroelectronics Generic PHY driver for STiH407 USB2.
*
* Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
*/
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/mfd/syscon.h>
#include <linux/phy/phy.h>
#define PHYPARAM_REG 1
#define PHYCTRL_REG 2
/* Default PHY_SEL and REFCLKSEL configuration */
#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6
#define STIH407_USB_PICOPHY_CTRL_PORT_MASK 0x1f
/* ports parameters overriding */
#define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc
#define STIH407_USB_PICOPHY_PARAM_MASK 0xffffffff
struct stih407_usb2_picophy {
struct phy *phy;
struct regmap *regmap;
struct device *dev;
struct reset_control *rstc;
struct reset_control *rstport;
int ctrl;
int param;
};
static int stih407_usb2_pico_ctrl(struct stih407_usb2_picophy *phy_dev)
{
reset_control_deassert(phy_dev->rstc);
return regmap_update_bits(phy_dev->regmap, phy_dev->ctrl,
STIH407_USB_PICOPHY_CTRL_PORT_MASK,
STIH407_USB_PICOPHY_CTRL_PORT_CONF);
}
static int stih407_usb2_init_port(struct phy *phy)
{
int ret;
struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);
stih407_usb2_pico_ctrl(phy_dev);
ret = regmap_update_bits(phy_dev->regmap,
phy_dev->param,
STIH407_USB_PICOPHY_PARAM_MASK,
STIH407_USB_PICOPHY_PARAM_DEF);
if (ret)
return ret;
return reset_control_deassert(phy_dev->rstport);
}
static int stih407_usb2_exit_port(struct phy *phy)
{
struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);
/*
* Only port reset is asserted, phy global reset is kept untouched
* as other ports may still be active. When all ports are in reset
* state, assumption is made that power will be cut off on the phy, in
* case of suspend for instance. Theoretically, asserting individual
* reset (like here) or global reset should be equivalent.
*/
return reset_control_assert(phy_dev->rstport);
}
static const struct phy_ops stih407_usb2_picophy_data = {
.init = stih407_usb2_init_port,
.exit = stih407_usb2_exit_port,
.owner = THIS_MODULE,
};
static int stih407_usb2_picophy_probe(struct platform_device *pdev)
{
struct stih407_usb2_picophy *phy_dev;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct phy_provider *phy_provider;
struct phy *phy;
int ret;
phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
if (!phy_dev)
return -ENOMEM;
phy_dev->dev = dev;
dev_set_drvdata(dev, phy_dev);
phy_dev->rstc = devm_reset_control_get_shared(dev, "global");
if (IS_ERR(phy_dev->rstc)) {
dev_err(dev, "failed to ctrl picoPHY reset\n");
return PTR_ERR(phy_dev->rstc);
}
phy_dev->rstport = devm_reset_control_get_exclusive(dev, "port");
if (IS_ERR(phy_dev->rstport)) {
dev_err(dev, "failed to ctrl picoPHY reset\n");
return PTR_ERR(phy_dev->rstport);
}
/* Reset port by default: only deassert it in phy init */
reset_control_assert(phy_dev->rstport);
phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
if (IS_ERR(phy_dev->regmap)) {
dev_err(dev, "No syscfg phandle specified\n");
return PTR_ERR(phy_dev->regmap);
}
ret = of_property_read_u32_index(np, "st,syscfg", PHYPARAM_REG,
&phy_dev->param);
if (ret) {
dev_err(dev, "can't get phyparam offset (%d)\n", ret);
return ret;
}
ret = of_property_read_u32_index(np, "st,syscfg", PHYCTRL_REG,
&phy_dev->ctrl);
if (ret) {
dev_err(dev, "can't get phyctrl offset (%d)\n", ret);
return ret;
}
phy = devm_phy_create(dev, NULL, &stih407_usb2_picophy_data);
if (IS_ERR(phy)) {
dev_err(dev, "failed to create Display Port PHY\n");
return PTR_ERR(phy);
}
phy_dev->phy = phy;
phy_set_drvdata(phy, phy_dev);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
if (IS_ERR(phy_provider))
return PTR_ERR(phy_provider);
dev_info(dev, "STiH407 USB Generic picoPHY driver probed!");
return 0;
}
static const struct of_device_id stih407_usb2_picophy_of_match[] = {
{ .compatible = "st,stih407-usb2-phy" },
{ /*sentinel */ },
};
MODULE_DEVICE_TABLE(of, stih407_usb2_picophy_of_match);
static struct platform_driver stih407_usb2_picophy_driver = {
.probe = stih407_usb2_picophy_probe,
.driver = {
.name = "stih407-usb-genphy",
.of_match_table = stih407_usb2_picophy_of_match,
}
};
module_platform_driver(stih407_usb2_picophy_driver);
MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
MODULE_DESCRIPTION("STMicroelectronics Generic picoPHY driver for STiH407");
MODULE_LICENSE("GPL v2");