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![Peter Griffin](/assets/img/avatar_default.png)
This is the generic phy driver for the picoPHY ports used by the USB2 and USB3 Host controllers when controlling usb2/1.1 devices. It is found on STiH407 SoC family from STMicroelectronics. Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: Peter Griffin <peter.griffin@linaro.org> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
177 lines
4.8 KiB
C
177 lines
4.8 KiB
C
/*
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* Copyright (C) 2014 STMicroelectronics
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*
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* STMicroelectronics Generic PHY driver for STiH407 USB2.
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*
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* Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2, as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/clk.h>
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#include <linux/regmap.h>
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#include <linux/reset.h>
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#include <linux/mfd/syscon.h>
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#include <linux/phy/phy.h>
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/* Default PHY_SEL and REFCLKSEL configuration */
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#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6
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#define STIH407_USB_PICOPHY_CTRL_PORT_MASK 0x1f
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/* ports parameters overriding */
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#define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc
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#define STIH407_USB_PICOPHY_PARAM_MASK 0xffffffff
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struct stih407_usb2_picophy {
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struct phy *phy;
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struct regmap *regmap;
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struct device *dev;
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struct reset_control *rstc;
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struct reset_control *rstport;
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int ctrl;
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int param;
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};
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static int stih407_usb2_pico_ctrl(struct stih407_usb2_picophy *phy_dev)
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{
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reset_control_deassert(phy_dev->rstc);
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return regmap_update_bits(phy_dev->regmap, phy_dev->ctrl,
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STIH407_USB_PICOPHY_CTRL_PORT_MASK,
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STIH407_USB_PICOPHY_CTRL_PORT_CONF);
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}
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static int stih407_usb2_init_port(struct phy *phy)
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{
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int ret;
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struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);
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stih407_usb2_pico_ctrl(phy_dev);
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ret = regmap_update_bits(phy_dev->regmap,
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phy_dev->param,
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STIH407_USB_PICOPHY_PARAM_MASK,
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STIH407_USB_PICOPHY_PARAM_DEF);
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if (ret)
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return ret;
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return reset_control_deassert(phy_dev->rstport);
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}
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static int stih407_usb2_exit_port(struct phy *phy)
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{
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struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy);
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/*
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* Only port reset is asserted, phy global reset is kept untouched
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* as other ports may still be active. When all ports are in reset
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* state, assumption is made that power will be cut off on the phy, in
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* case of suspend for instance. Theoretically, asserting individual
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* reset (like here) or global reset should be equivalent.
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*/
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return reset_control_assert(phy_dev->rstport);
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}
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static const struct phy_ops stih407_usb2_picophy_data = {
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.init = stih407_usb2_init_port,
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.exit = stih407_usb2_exit_port,
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.owner = THIS_MODULE,
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};
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static int stih407_usb2_picophy_probe(struct platform_device *pdev)
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{
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struct stih407_usb2_picophy *phy_dev;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct phy_provider *phy_provider;
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struct phy *phy;
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struct resource *res;
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phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
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if (!phy_dev)
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return -ENOMEM;
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phy_dev->dev = dev;
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dev_set_drvdata(dev, phy_dev);
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phy_dev->rstc = devm_reset_control_get(dev, "global");
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if (IS_ERR(phy_dev->rstc)) {
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dev_err(dev, "failed to ctrl picoPHY reset\n");
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return PTR_ERR(phy_dev->rstc);
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}
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phy_dev->rstport = devm_reset_control_get(dev, "port");
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if (IS_ERR(phy_dev->rstport)) {
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dev_err(dev, "failed to ctrl picoPHY reset\n");
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return PTR_ERR(phy_dev->rstport);
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}
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/* Reset port by default: only deassert it in phy init */
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reset_control_assert(phy_dev->rstport);
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phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
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if (IS_ERR(phy_dev->regmap)) {
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dev_err(dev, "No syscfg phandle specified\n");
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return PTR_ERR(phy_dev->regmap);
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}
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
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if (!res) {
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dev_err(dev, "No ctrl reg found\n");
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return -ENXIO;
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}
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phy_dev->ctrl = res->start;
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "param");
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if (!res) {
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dev_err(dev, "No param reg found\n");
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return -ENXIO;
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}
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phy_dev->param = res->start;
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phy = devm_phy_create(dev, NULL, &stih407_usb2_picophy_data, NULL);
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if (IS_ERR(phy)) {
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dev_err(dev, "failed to create Display Port PHY\n");
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return PTR_ERR(phy);
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}
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phy_dev->phy = phy;
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phy_set_drvdata(phy, phy_dev);
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phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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if (IS_ERR(phy_provider))
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return PTR_ERR(phy_provider);
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dev_info(dev, "STiH407 USB Generic picoPHY driver probed!");
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return 0;
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}
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static const struct of_device_id stih407_usb2_picophy_of_match[] = {
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{ .compatible = "st,stih407-usb2-phy" },
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{ /*sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, stih407_usb2_picophy_of_match);
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static struct platform_driver stih407_usb2_picophy_driver = {
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.probe = stih407_usb2_picophy_probe,
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.driver = {
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.name = "stih407-usb-genphy",
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.of_match_table = stih407_usb2_picophy_of_match,
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}
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};
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module_platform_driver(stih407_usb2_picophy_driver);
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MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics Generic picoPHY driver for STiH407");
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MODULE_LICENSE("GPL v2");
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