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176 lines
4.7 KiB
176 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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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#define PHYPARAM_REG 1 |
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#define PHYCTRL_REG 2 |
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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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int ret; |
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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_shared(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_exclusive(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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ret = of_property_read_u32_index(np, "st,syscfg", PHYPARAM_REG, |
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&phy_dev->param); |
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if (ret) { |
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dev_err(dev, "can't get phyparam offset (%d)\n", ret); |
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return ret; |
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} |
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ret = of_property_read_u32_index(np, "st,syscfg", PHYCTRL_REG, |
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&phy_dev->ctrl); |
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if (ret) { |
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dev_err(dev, "can't get phyctrl offset (%d)\n", ret); |
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return ret; |
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} |
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phy = devm_phy_create(dev, NULL, &stih407_usb2_picophy_data); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("STMicroelectronics Generic picoPHY driver for STiH407"); |
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MODULE_LICENSE("GPL v2");
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