Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756263AbaLICoE (ORCPT ); Mon, 8 Dec 2014 21:44:04 -0500 Received: from lucky1.263xmail.com ([211.157.147.130]:55080 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753148AbaLICoA (ORCPT ); Mon, 8 Dec 2014 21:44:00 -0500 X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-RL-SENDER: lyz@rock-chips.com X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: lyz@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Yunzhi Li To: heiko@sntech.de, dianders@chromium.org Cc: olof@lixom.net, huangtao@rock-chips.com, zyw@rock-chips.com, cf@rock-chips.com, linux-rockchip@lists.infradead.org, Yunzhi Li , Kishon Vijay Abraham I , Grant Likely , Rob Herring , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org Subject: [PATCH v4 1/5] phy: add a driver for the Rockchip SoC internal USB2.0 PHY Date: Tue, 9 Dec 2014 10:43:17 +0800 Message-Id: <1418093001-30443-2-git-send-email-lyz@rock-chips.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1418093001-30443-1-git-send-email-lyz@rock-chips.com> References: <1418093001-30443-1-git-send-email-lyz@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch to add a generic PHY driver for ROCKCHIP usb PHYs, currently this driver can support RK3288. The RK3288 SoC have three independent USB PHY IPs which are all configured through a set of registers located in the GRF (general register files) module. Signed-off-by: Yunzhi Li --- Changes in v4: - Get number of PHYs from device tree. - Model each PHY as subnode of the phy provider node. Changes in v3: - Use BIT macro instead of bit shift ops. - Rename the config entry to PHY_ROCKCHIP_USB. drivers/phy/Kconfig | 7 ++ drivers/phy/Makefile | 1 + drivers/phy/phy-rockchip-usb.c | 211 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 219 insertions(+) create mode 100644 drivers/phy/phy-rockchip-usb.c diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index ccad880..8a39d2a 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -239,6 +239,13 @@ config PHY_QCOM_IPQ806X_SATA depends on OF select GENERIC_PHY +config PHY_ROCKCHIP_USB2 + tristate "Rockchip USB2 PHY Driver" + depends on ARCH_ROCKCHIP && OF + select GENERIC_PHY + help + Enable this to support the Rockchip USB 2.0 PHY. + config PHY_ST_SPEAR1310_MIPHY tristate "ST SPEAR1310-MIPHY driver" select GENERIC_PHY diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index aa74f96..8a13f72 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -28,6 +28,7 @@ phy-exynos-usb2-$(CONFIG_PHY_EXYNOS5250_USB2) += phy-exynos5250-usb2.o phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2) += phy-s5pv210-usb2.o obj-$(CONFIG_PHY_EXYNOS5_USBDRD) += phy-exynos5-usbdrd.o obj-$(CONFIG_PHY_QCOM_APQ8064_SATA) += phy-qcom-apq8064-sata.o +obj-$(CONFIG_PHY_ROCKCHIP_USB2) += phy-rockchip-usb.o obj-$(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 diff --git a/drivers/phy/phy-rockchip-usb.c b/drivers/phy/phy-rockchip-usb.c new file mode 100644 index 0000000..0317c21 --- /dev/null +++ b/drivers/phy/phy-rockchip-usb.c @@ -0,0 +1,211 @@ +/* + * Rockchip usb PHY driver + * + * Copyright (C) 2014 Yunzhi Li + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ROCKCHIP_RK3288_UOC(n) (0x320 + n * 0x14) + +/* + * 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_MSK BIT(13 + 16) +#define SIDDQ_ON BIT(13) +#define SIDDQ_OFF (0 << 13) + +struct rockchip_usb_phy { + struct regmap *reg_base; + unsigned int reg_offset; + struct clk *clk; + struct phy *phy; + unsigned index; +}; + +struct rockchip_usb_phy_priv { + struct rockchip_usb_phy *phys; + unsigned nphys; +}; + +static int rockchip_usb_phy_power(struct rockchip_usb_phy *phy, + bool siddq) +{ + return regmap_write(phy->reg_base, phy->reg_offset, + SIDDQ_MSK | (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); + if (ret) + return ret; + + 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) + return ret; + + return 0; +} + +static struct phy *rockchip_usb_phy_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct rockchip_usb_phy_priv *priv = dev_get_drvdata(dev); + int i; + + if (WARN_ON(args->args[0] >= priv->nphys)) + return ERR_PTR(-ENODEV); + + for (i = 0; i < priv->nphys; i++) { + if (priv->phys[i].index == args->args[0]) + break; + } + + if (i == priv->nphys) + return ERR_PTR(-ENODEV); + + return priv->phys[i].phy; +} + +static 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 rockchip_usb_phy_priv *priv; + struct phy_provider *phy_provider; + struct device_node *child; + struct regmap *grf; + unsigned int phy_id; + + 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); + } + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + /* Get number of phys from device tree */ + priv->nphys = of_get_child_count(dev->of_node); + if (priv->nphys == 0) + return -ENODEV; + + priv->phys = devm_kzalloc(dev, priv->nphys * sizeof(*priv->phys), + GFP_KERNEL); + if (!priv->phys) + return -ENOMEM; + + rk_phy = priv->phys; + for_each_available_child_of_node(dev->of_node, child) { + if (of_property_read_u32(child, "reg", &phy_id)) { + dev_err(dev, "missing reg property in node %s\n", + child->name); + return -EINVAL; + } + + if (phy_id < 0 || phy_id >= priv->nphys) { + dev_err(dev, "invalid phy id\n"); + return -EINVAL; + } + + rk_phy->reg_offset = ROCKCHIP_RK3288_UOC(phy_id); + rk_phy->reg_base = grf; + + rk_phy->clk = of_clk_get(child, 0); + if (IS_ERR(rk_phy->clk)) { + dev_warn(dev, "failed to get clock\n"); + rk_phy->clk = NULL; + } + + rk_phy->phy = devm_phy_create(dev, NULL, &ops); + if (IS_ERR(rk_phy->phy)) { + dev_err(dev, "failed to create PHY %d\n", phy_id); + return PTR_ERR(rk_phy->phy); + } + phy_set_drvdata(rk_phy->phy, rk_phy); + + rk_phy->index = phy_id; + rk_phy++; + } + + platform_set_drvdata(pdev, priv); + + phy_provider = devm_of_phy_provider_register(dev, + rockchip_usb_phy_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", + .owner = THIS_MODULE, + .of_match_table = rockchip_usb_phy_dt_ids, + }, +}; + +module_platform_driver(rockchip_usb_driver); + +MODULE_AUTHOR("Yunzhi Li "); +MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver"); +MODULE_LICENSE("GPL v2"); -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/