phy: phy-stih407-usb: Add usb picoPHY driver found on stih407 SoC family (89ae1f5d) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/phy/Kconfig

+9 −0

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		@@ -239,4 +239,13 @@ config PHY_XGENE
		help
		This option enables support for APM X-Gene SoC multi-purpose PHY.

		config PHY_STIH407_USB
		tristate "STMicroelectronics USB2 picoPHY driver for STiH407 family"
		depends on RESET_CONTROLLER
		depends on ARCH_STI \|\| COMPILE_TEST
		select GENERIC_PHY
		help
		Enable this support to enable the picoPHY device used by USB2
		and USB3 controllers on STMicroelectronics STiH407 SoC families.

		endmenu

drivers/phy/Makefile

+1 −0

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		@@ -29,3 +29,4 @@ obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o
		obj-$(CONFIG_PHY_ST_SPEAR1310_MIPHY) += phy-spear1310-miphy.o
		obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY) += phy-spear1340-miphy.o
		obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
		obj-$(CONFIG_PHY_STIH407_USB) += phy-stih407-usb.o

drivers/phy/phy-stih407-usb.c

0 → 100644

+177 −0

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		/*
		* 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>

		/* 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;
		struct resource *res;

		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(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(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);
		}

		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
		if (!res) {
		dev_err(dev, "No ctrl reg found\n");
		return -ENXIO;
		}
		phy_dev->ctrl = res->start;

		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "param");
		if (!res) {
		dev_err(dev, "No param reg found\n");
		return -ENXIO;
		}
		phy_dev->param = res->start;

		phy = devm_phy_create(dev, NULL, &stih407_usb2_picophy_data, NULL);
		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");