/* * Rockchip usb PHY driver * * Copyright (C) 2014 Yunzhi Li <lyz@rock-chips.com> * Copyright (C) 2014 ROCKCHIP, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/clk.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/regulator/consumer.h> #include <linux/reset.h> #include <linux/regmap.h> #include <linux/mfd/syscon.h> /* * The higher 16-bit of this register is used for write protection * only if BIT(13 + 16) set to 1 the BIT(13) can be written. */ #define SIDDQ_WRITE_ENA BIT(29) #define SIDDQ_ON BIT(13) #define SIDDQ_OFF (0 << 13) struct rockchip_usb_phy { unsigned int reg_offset; struct regmap *reg_base; struct clk *clk; struct phy *phy; }; static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy, bool siddq) { return regmap_write(phy->reg_base, phy->reg_offset, SIDDQ_WRITE_ENA | (siddq ? SIDDQ_ON : SIDDQ_OFF)); } static int rockchip_usb_phy_power_off(struct phy *_phy) { struct rockchip_usb_phy *phy = phy_get_drvdata(_phy); int ret = 0; /* Power down usb phy analog blocks by set siddq 1 */ ret = rockchip_usb_phy_power(phy, 1); if (ret) return ret; clk_disable_unprepare(phy->clk); return 0; } static int rockchip_usb_phy_power_on(struct phy *_phy) { struct rockchip_usb_phy *phy = phy_get_drvdata(_phy); int ret = 0; ret = clk_prepare_enable(phy->clk); if (ret) return ret; /* Power up usb phy analog blocks by set siddq 0 */ ret = rockchip_usb_phy_power(phy, 0); if (ret) { clk_disable_unprepare(phy->clk); return ret; } return 0; } static const struct phy_ops ops = { .power_on = rockchip_usb_phy_power_on, .power_off = rockchip_usb_phy_power_off, .owner = THIS_MODULE, }; static int rockchip_usb_phy_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rockchip_usb_phy *rk_phy; struct phy_provider *phy_provider; struct device_node *child; struct regmap *grf; unsigned int reg_offset; int err; grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf"); if (IS_ERR(grf)) { dev_err(&pdev->dev, "Missing rockchip,grf property\n"); return PTR_ERR(grf); } for_each_available_child_of_node(dev->of_node, child) { rk_phy = devm_kzalloc(dev, sizeof(*rk_phy), GFP_KERNEL); if (!rk_phy) return -ENOMEM; if (of_property_read_u32(child, "reg", ®_offset)) { dev_err(dev, "missing reg property in node %s\n", child->name); return -EINVAL; } rk_phy->reg_offset = reg_offset; rk_phy->reg_base = grf; rk_phy->clk = of_clk_get_by_name(child, "phyclk"); if (IS_ERR(rk_phy->clk)) rk_phy->clk = NULL; rk_phy->phy = devm_phy_create(dev, child, &ops); if (IS_ERR(rk_phy->phy)) { dev_err(dev, "failed to create PHY\n"); return PTR_ERR(rk_phy->phy); } phy_set_drvdata(rk_phy->phy, rk_phy); /* only power up usb phy when it use, so disable it when init*/ err = rockchip_usb_phy_power(rk_phy, 1); if (err) return err; } phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); return PTR_ERR_OR_ZERO(phy_provider); } static const struct of_device_id rockchip_usb_phy_dt_ids[] = { { .compatible = "rockchip,rk3288-usb-phy" }, {} }; MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids); static struct platform_driver rockchip_usb_driver = { .probe = rockchip_usb_phy_probe, .driver = { .name = "rockchip-usb-phy", .of_match_table = rockchip_usb_phy_dt_ids, }, }; module_platform_driver(rockchip_usb_driver); MODULE_AUTHOR("Yunzhi Li <lyz@rock-chips.com>"); MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver"); MODULE_LICENSE("GPL v2");