Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3f8da2e3 authored by Peter Griffin's avatar Peter Griffin Committed by Kishon Vijay Abraham I
Browse files

phy: phy-stih41x-usb: Add usb phy support for STiH41x SoCs.



This driver adds support for USB (1.1 and 2.0) phy for STiH415 and
STiH416 System-On-Chips from STMicroelectronics.

Signed-off-by: default avatarMaxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: default avatarPeter Griffin <peter.griffin@linaro.org>
Signed-off-by: default avatarKishon Vijay Abraham I <kishon@ti.com>
parent 6da969a5
Loading
Loading
Loading
Loading
+8 −0
Original line number Original line Diff line number Diff line
@@ -248,4 +248,12 @@ config PHY_STIH407_USB
	  Enable this support to enable the picoPHY device used by USB2
	  Enable this support to enable the picoPHY device used by USB2
	  and USB3 controllers on STMicroelectronics STiH407 SoC families.
	  and USB3 controllers on STMicroelectronics STiH407 SoC families.


config PHY_STIH41X_USB
	tristate "STMicroelectronics USB2 PHY driver for STiH41x series"
	depends on ARCH_STI
	select GENERIC_PHY
	help
	  Enable this to support the USB transceiver that is part of
	  STMicroelectronics STiH41x SoC series.

endmenu
endmenu
+1 −0
Original line number Original line Diff line number Diff line
@@ -30,3 +30,4 @@ obj-$(CONFIG_PHY_ST_SPEAR1310_MIPHY) += phy-spear1310-miphy.o
obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY)	+= phy-spear1340-miphy.o
obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY)	+= phy-spear1340-miphy.o
obj-$(CONFIG_PHY_XGENE)			+= phy-xgene.o
obj-$(CONFIG_PHY_XGENE)			+= phy-xgene.o
obj-$(CONFIG_PHY_STIH407_USB)		+= phy-stih407-usb.o
obj-$(CONFIG_PHY_STIH407_USB)		+= phy-stih407-usb.o
obj-$(CONFIG_PHY_STIH41X_USB)		+= phy-stih41x-usb.o
+187 −0
Original line number Original line Diff line number Diff line
/*
 * Copyright (C) 2014 STMicroelectronics
 *
 * STMicroelectronics PHY driver for STiH41x USB.
 *
 * Author: Maxime Coquelin <maxime.coquelin@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/phy/phy.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>

#define SYSCFG332  0x80
#define SYSCFG2520 0x820

/**
 * struct stih41x_usb_cfg - SoC specific PHY register mapping
 * @syscfg: Offset in syscfg registers bank
 * @cfg_mask: Bits mask for PHY configuration
 * @cfg: Static configuration value for PHY
 * @oscok: Notify the PHY oscillator clock is ready
 *	   Setting this bit enable the PHY
 */
struct stih41x_usb_cfg {
	u32 syscfg;
	u32 cfg_mask;
	u32 cfg;
	u32 oscok;
};

/**
 * struct stih41x_usb_phy - Private data for the PHY
 * @dev: device for this controller
 * @regmap: Syscfg registers bank in which PHY is configured
 * @cfg: SoC specific PHY register mapping
 * @clk: Oscillator used by the PHY
 */
struct stih41x_usb_phy {
	struct device *dev;
	struct regmap *regmap;
	const struct stih41x_usb_cfg *cfg;
	struct clk *clk;
};

static struct stih41x_usb_cfg stih415_usb_phy_cfg = {
	.syscfg = SYSCFG332,
	.cfg_mask = 0x3f,
	.cfg = 0x38,
	.oscok = BIT(6),
};

static struct stih41x_usb_cfg stih416_usb_phy_cfg = {
	.syscfg = SYSCFG2520,
	.cfg_mask = 0x33f,
	.cfg = 0x238,
	.oscok = BIT(6),
};

static int stih41x_usb_phy_init(struct phy *phy)
{
	struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);

	return regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
			   phy_dev->cfg->cfg_mask, phy_dev->cfg->cfg);
}

static int stih41x_usb_phy_power_on(struct phy *phy)
{
	struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
	int ret;

	ret = clk_prepare_enable(phy_dev->clk);
	if (ret) {
		dev_err(phy_dev->dev, "Failed to enable osc_phy clock\n");
		return ret;
	}

	return regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
			phy_dev->cfg->oscok, phy_dev->cfg->oscok);
}

static int stih41x_usb_phy_power_off(struct phy *phy)
{
	struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
	int ret;

	ret = regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
			phy_dev->cfg->oscok, 0);
	if (ret) {
		dev_err(phy_dev->dev, "Failed to clear oscok bit\n");
		return ret;
	}

	clk_disable_unprepare(phy_dev->clk);

	return 0;
}

static struct phy_ops stih41x_usb_phy_ops = {
	.init		= stih41x_usb_phy_init,
	.power_on	= stih41x_usb_phy_power_on,
	.power_off	= stih41x_usb_phy_power_off,
	.owner		= THIS_MODULE,
};

static const struct of_device_id stih41x_usb_phy_of_match[];

static int stih41x_usb_phy_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	const struct of_device_id *match;
	struct stih41x_usb_phy *phy_dev;
	struct device *dev = &pdev->dev;
	struct phy_provider *phy_provider;
	struct phy *phy;

	phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
	if (!phy_dev)
		return -ENOMEM;

	match = of_match_device(stih41x_usb_phy_of_match, &pdev->dev);
	if (!match)
		return -ENODEV;

	phy_dev->cfg = match->data;

	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);
	}

	phy_dev->clk = devm_clk_get(dev, "osc_phy");
	if (IS_ERR(phy_dev->clk)) {
		dev_err(dev, "osc_phy clk not found\n");
		return PTR_ERR(phy_dev->clk);
	}

	phy = devm_phy_create(dev, NULL, &stih41x_usb_phy_ops, NULL);

	if (IS_ERR(phy)) {
		dev_err(dev, "failed to create phy\n");
		return PTR_ERR(phy);
	}

	phy_dev->dev = dev;

	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);

	return 0;
}

static const struct of_device_id stih41x_usb_phy_of_match[] = {
	{ .compatible = "st,stih415-usb-phy", .data = &stih415_usb_phy_cfg },
	{ .compatible = "st,stih416-usb-phy", .data = &stih416_usb_phy_cfg },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, stih41x_usb_phy_of_match);

static struct platform_driver stih41x_usb_phy_driver = {
	.probe	= stih41x_usb_phy_probe,
	.driver = {
		.name	= "stih41x-usb-phy",
		.of_match_table	= stih41x_usb_phy_of_match,
	}
};
module_platform_driver(stih41x_usb_phy_driver);

MODULE_AUTHOR("Maxime Coquelin <maxime.coquelin@st.com>");
MODULE_DESCRIPTION("STMicroelectronics USB PHY driver for STiH41x series");
MODULE_LICENSE("GPL v2");