From patchwork Fri Dec 12 17:13:58 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanimir Varbanov X-Patchwork-Id: 5484361 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 5B40FBEEA8 for ; Fri, 12 Dec 2014 17:19:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 38FA720148 for ; Fri, 12 Dec 2014 17:19:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DF8B92010B for ; Fri, 12 Dec 2014 17:19:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031061AbaLLRRf (ORCPT ); Fri, 12 Dec 2014 12:17:35 -0500 Received: from ns.mm-sol.com ([37.157.136.199]:33683 "EHLO extserv.mm-sol.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030596AbaLLRRc (ORCPT ); Fri, 12 Dec 2014 12:17:32 -0500 Received: from localhost.localdomain (unknown [37.157.136.206]) by extserv.mm-sol.com (Postfix) with ESMTPSA id B1D7EC842; Fri, 12 Dec 2014 19:17:29 +0200 (EET) From: Stanimir Varbanov To: Rob Herring , Kumar Gala , Mark Rutland , Grant Likely , Bjorn Helgaas , Kishon Vijay Abraham I , Russell King , Arnd Bergmann Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, Stanimir Varbanov Subject: [PATCH 2/5] phy: qcom: Add Qualcomm PCIe PHY Date: Fri, 12 Dec 2014 19:13:58 +0200 Message-Id: <1418404441-5518-3-git-send-email-svarbanov@mm-sol.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1418404441-5518-1-git-send-email-svarbanov@mm-sol.com> References: <1418404441-5518-1-git-send-email-svarbanov@mm-sol.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a PCIe PHY driver used by PCIe host controller driver on Qualcomm SoCs like Snapdragon 805. Signed-off-by: Stanimir Varbanov --- drivers/phy/Kconfig | 7 + drivers/phy/Makefile | 1 + drivers/phy/phy-qcom-pcie.c | 311 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 319 insertions(+), 0 deletions(-) create mode 100644 drivers/phy/phy-qcom-pcie.c diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 2a436e6..135bdcc 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -218,6 +218,13 @@ config PHY_QCOM_IPQ806X_SATA depends on OF select GENERIC_PHY +config PHY_QCOM_PCIE + tristate "Qualcomm PCIe SerDes/PHY driver" + depends on ARCH_QCOM + depends on HAS_IOMEM + depends on OF + select GENERIC_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 c4590fc..e7662fb 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -26,6 +26,7 @@ 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_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o +obj-$(CONFIG_PHY_QCOM_PCIE) += phy-qcom-pcie.o obj-$(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 diff --git a/drivers/phy/phy-qcom-pcie.c b/drivers/phy/phy-qcom-pcie.c new file mode 100644 index 0000000..3db348a --- /dev/null +++ b/drivers/phy/phy-qcom-pcie.c @@ -0,0 +1,311 @@ +/* + * Copyright (c) 2014, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * 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 + +#define QSERDES_COM_PLL_CP_SETI 0x024 +#define QSERDES_COM_PLL_IP_SETP 0x028 +#define QSERDES_COM_PLL_CP_SETP 0x02c +#define QSERDES_COM_SYSCLK_EN_SEL 0x038 +#define QSERDES_COM_RESETSM_CNTRL 0x040 +#define QSERDES_COM_PLLLOCK_CMP1 0x044 +#define QSERDES_COM_PLLLOCK_CMP2 0x048 +#define QSERDES_COM_PLLLOCK_CMP_EN 0x050 +#define QSERDES_COM_DEC_START1 0x064 +#define QSERDES_COM_DIV_FRAC_START1 0x098 +#define QSERDES_COM_DIV_FRAC_START2 0x09c +#define QSERDES_COM_DIV_FRAC_START3 0x0a0 +#define QSERDES_COM_DEC_START2 0x0a4 +#define QSERDES_COM_PLL_RXTXEPCLK_EN 0x0a8 +#define QSERDES_COM_PLL_CRCTRL 0x0ac + +#define QSERDES_RX_CDR_CONTROL 0x400 +#define QSERDES_RX_CDR_CONTROL2 0x410 +#define QSERDES_RX_RX_TERM_HIGHZ_CM_AC_COUPLE 0x42c +#define QSERDES_RX_RX_EQ_GAIN12 0x430 + +#define PCIE_PHY_SW_RESET 0x600 +#define PCIE_PHY_POWER_DOWN_CONTROL 0x604 +#define PCIE_PHY_START 0x608 +#define PCIE_PHY_ENDPOINT_REFCLK_DRIVE 0x648 +#define PCIE_PHY_POWER_STATE_CONFIG1 0x650 +#define PCIE_PHY_POWER_STATE_CONFIG2 0x654 +#define PCIE_PHY_PWRUP_RESET_DLY_TIME_SYSCLK 0x678 +#define PCIE_PHY_PWRUP_RESET_DLY_TIME_AUXCLK 0x67c +#define PCIE_PHY_PCS_STATUS 0x6c8 + +#define PHY_DELAY_MIN_US 995 +#define PHY_DELAY_MAX_US 1005 +#define PHY_RETRIES_COUNT 10 + +#define PIPE_CLK_DELAY_MIN_US 5000 +#define PIPE_CLK_DELAY_MAX_US 5100 +#define PIPE_CLK_RETRIES_COUNT 10 + +struct qcom_pcie_phy { + void __iomem *base; + struct clk *clk; + struct reset_control *res_phy; + struct regulator *vdda_pll; + struct regulator *vdda; + struct device *dev; +}; + +struct phy_regs { + u32 reg_offset; + u32 val; +}; + +static const struct phy_regs pcie_phy_regs[] = { + { PCIE_PHY_POWER_DOWN_CONTROL, 0x03 }, + { QSERDES_COM_SYSCLK_EN_SEL, 0x08 }, + { QSERDES_COM_DEC_START1, 0x82 }, + { QSERDES_COM_DEC_START2, 0x03 }, + { QSERDES_COM_DIV_FRAC_START1, 0xd5 }, + { QSERDES_COM_DIV_FRAC_START2, 0xaa }, + { QSERDES_COM_DIV_FRAC_START3, 0x13 }, + { QSERDES_COM_PLLLOCK_CMP_EN, 0x01 }, + { QSERDES_COM_PLLLOCK_CMP1, 0x2b }, + { QSERDES_COM_PLLLOCK_CMP2, 0x68 }, + { QSERDES_COM_PLL_CRCTRL, 0xff }, + { QSERDES_COM_PLL_CP_SETI, 0x3f }, + { QSERDES_COM_PLL_IP_SETP, 0x07 }, + { QSERDES_COM_PLL_CP_SETP, 0x03 }, + { QSERDES_RX_CDR_CONTROL, 0xf3 }, + { QSERDES_RX_CDR_CONTROL2, 0x6b }, + { QSERDES_COM_RESETSM_CNTRL, 0x10 }, + { QSERDES_RX_RX_TERM_HIGHZ_CM_AC_COUPLE, 0x87 }, + { QSERDES_RX_RX_EQ_GAIN12, 0x54 }, + { PCIE_PHY_POWER_STATE_CONFIG1, 0xa3 }, + { PCIE_PHY_POWER_STATE_CONFIG2, 0xcb }, + { QSERDES_COM_PLL_RXTXEPCLK_EN, 0x10 }, + { PCIE_PHY_ENDPOINT_REFCLK_DRIVE, 0x10 }, + { PCIE_PHY_SW_RESET, 0x00 }, + { PCIE_PHY_START, 0x03 }, +}; + +static void qcom_pcie_phy_init(struct qcom_pcie_phy *pcie) +{ + const struct phy_regs *regs = pcie_phy_regs; + int i; + + for (i = 0; i < ARRAY_SIZE(pcie_phy_regs); i++) + writel(regs[i].val, pcie->base + regs[i].reg_offset); +} + +static bool qcom_pcie_phy_is_ready(struct qcom_pcie_phy *pcie) +{ + u32 val = readl(pcie->base + PCIE_PHY_PCS_STATUS); + + return val & BIT(6) ? false : true; +} + +static int qcom_pcie_phy_power_on(struct phy *phy) +{ + struct qcom_pcie_phy *pcie = phy_get_drvdata(phy); + struct device *dev = pcie->dev; + int ret, retries; + + ret = regulator_enable(pcie->vdda_pll); + if (ret) { + dev_err(dev, "cannot enable vdda_pll regulator\n"); + return ret; + } + + ret = regulator_enable(pcie->vdda); + if (ret) { + dev_err(dev, "cannot enable vdda regulator\n"); + goto fail_vdda_pll; + } + + ret = reset_control_deassert(pcie->res_phy); + if (ret) { + dev_err(dev, "cannot deassert phy reset\n"); + goto fail_vdda; + } + + qcom_pcie_phy_init(pcie); + + usleep_range(PHY_DELAY_MIN_US, PHY_DELAY_MAX_US); + + ret = clk_set_rate(pcie->clk, ~0); + if (ret) { + dev_err(dev, "cannot set pipe clk rate\n"); + goto fail_res; + } + + /* + * setting pipe rate takes time, try arbitrary delay before enabling + * the clock + */ + retries = PIPE_CLK_RETRIES_COUNT; + do { + usleep_range(PIPE_CLK_DELAY_MIN_US, PIPE_CLK_DELAY_MAX_US); + + ret = clk_prepare_enable(pcie->clk); + if (!ret) + break; + } while (retries--); + + if (retries < 0) { + dev_err(dev, "cannot enable phy clock\n"); + goto fail_res; + } + + retries = PHY_RETRIES_COUNT; + do { + ret = qcom_pcie_phy_is_ready(pcie); + if (ret) + break; + usleep_range(PHY_DELAY_MIN_US, PHY_DELAY_MAX_US); + } while (retries--); + + if (retries < 0) { + dev_err(dev, "phy failed to come up\n"); + ret = -ETIMEDOUT; + goto fail; + } + + return 0; + +fail: + clk_disable_unprepare(pcie->clk); +fail_res: + reset_control_assert(pcie->res_phy); +fail_vdda: + regulator_disable(pcie->vdda); +fail_vdda_pll: + regulator_disable(pcie->vdda_pll); + + return ret; +} + +static int qcom_pcie_phy_power_off(struct phy *phy) +{ + struct qcom_pcie_phy *pcie = phy_get_drvdata(phy); + + writel(1, pcie->base + PCIE_PHY_SW_RESET); + writel(0, pcie->base + PCIE_PHY_POWER_DOWN_CONTROL); + + reset_control_assert(pcie->res_phy); + clk_disable_unprepare(pcie->clk); + regulator_disable(pcie->vdda); + regulator_disable(pcie->vdda_pll); + + return 0; +} + +static struct phy_ops qcom_pcie_phy_ops = { + .power_on = qcom_pcie_phy_power_on, + .power_off = qcom_pcie_phy_power_off, + .owner = THIS_MODULE, +}; + +static int qcom_pcie_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct phy_provider *provider; + struct qcom_pcie_phy *pcie; + struct resource *res; + struct phy *phy; + + pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); + if (!pcie) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + pcie->base = devm_ioremap_resource(dev, res); + if (IS_ERR(pcie->base)) + return PTR_ERR(pcie->base); + + pcie->clk = devm_clk_get(dev, "core"); + if (IS_ERR(pcie->clk)) { + dev_err(dev, "failed to get pcie phy clock\n"); + return PTR_ERR(pcie->clk); + } + + pcie->vdda = devm_regulator_get(dev, "vdda"); + if (IS_ERR(pcie->vdda)) { + dev_err(dev, "failed to get vdda regulator\n"); + return PTR_ERR(pcie->vdda); + } + + pcie->vdda_pll = devm_regulator_get(dev, "vdda_pll"); + if (IS_ERR(pcie->vdda_pll)) { + dev_err(dev, "failed to get vdda_pll regulator\n"); + return PTR_ERR(pcie->vdda_pll); + } + + pcie->res_phy = devm_reset_control_get(dev, "phy"); + if (IS_ERR(pcie->res_phy)) { + dev_err(dev, "cannot get phy reset controller"); + return PTR_ERR(pcie->res_phy); + } + + phy = devm_phy_create(dev, NULL, &qcom_pcie_phy_ops, NULL); + if (IS_ERR(phy)) { + dev_err(dev, "failed to create phy\n"); + return PTR_ERR(phy); + } + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(provider)) { + dev_err(dev, "failed to register phy provider\n"); + return PTR_ERR(provider); + } + + pcie->dev = dev; + phy_set_drvdata(phy, pcie); + platform_set_drvdata(pdev, pcie); + + return 0; +} + +static int qcom_pcie_phy_remove(struct platform_device *pdev) +{ + struct qcom_pcie_phy *pcie = platform_get_drvdata(pdev); + + clk_disable_unprepare(pcie->clk); + + return 0; +} + +static const struct of_device_id qcom_pcie_phy_of_match[] = { + { .compatible = "qcom,pcie-phy" }, + { }, +}; +MODULE_DEVICE_TABLE(of, qcom_pcie_phy_of_match); + +static struct platform_driver qcom_pcie_phy_driver = { + .probe = qcom_pcie_phy_probe, + .remove = qcom_pcie_phy_remove, + .driver = { + .name = "pcie-phy", + .of_match_table = qcom_pcie_phy_of_match, + } +}; +module_platform_driver(qcom_pcie_phy_driver); + +MODULE_AUTHOR("Stanimir Varbanov "); +MODULE_DESCRIPTION("QCOM PCIe PHY driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:pcie-phy");