From patchwork Wed Jun 2 12:07:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 12294009 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 056BFC4708F for ; Wed, 2 Jun 2021 12:08:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E077A61168 for ; Wed, 2 Jun 2021 12:08:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229697AbhFBMJx (ORCPT ); Wed, 2 Jun 2021 08:09:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229663AbhFBMJv (ORCPT ); Wed, 2 Jun 2021 08:09:51 -0400 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 003D0C06174A for ; Wed, 2 Jun 2021 05:08:07 -0700 (PDT) Received: by mail-pl1-x62e.google.com with SMTP id 69so1001185plc.5 for ; Wed, 02 Jun 2021 05:08:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=WvMmXhTxHZnXNL1q69wHChx/x73KLtybaTJDDd58n6o=; b=IA5S0gstqxEGIewvObCuPYmOo+eQZVBHq3AC9fuvTtPKlP1t5QGR7C/vQMhqnDeE1s E0CIQBEruKhlvIHovbLh3xEeThdIZMkr2jmBJLLYvGzwgxGoThk3tA5DWDg3WqTmv0+M oLxtoj55BvGnJowv8KiE5LbWB/pwv6zdXPQ3yllGhVx2mrK2s/Ku79UT2TpCMwHtJ13w P/XprsIROcP+FhH8uAY2K+mLCdTVHJ+D1eReu/NfpOkr2Ci2S0LiMcJ7RZ4FkH+Y6mfs XRq+7BNrN6oA01+5mbsXTKdDp3rB8QJ5uKx6RnlOOFacWBHSHgrZsRRb/C7oyBpBAfWP nHxg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=WvMmXhTxHZnXNL1q69wHChx/x73KLtybaTJDDd58n6o=; b=Po7P3c+wpKOpVJjviGEsL7NI55zv1DvzrKzxQqfJYqRDbQdjclS/spD2FWnKIN1Gg5 PvUzbzYVyk3H8M3dZauzM0dXAcYaQS1SWlg2Bh3SEsTB9hDVfrRHDyXU1ZUHJZDqqfgC /G7RmVdR6StCrbrmrZ5KuEds6tFzYJF7cHnMQbFiLxm6NYG4HGdwzhipbxH/VaDmDbWz 7aMlU13SLi14/x59TbxEve9d3P+SPrWv8y8PaFyN4FWKYT3p8UOz22a6fJvZ3F1zsZnh F33oEMm5Zrtr0R4qX55NrYw2kOCtfyICpwh2fTMnPGh6WYxw0ueZlfd2RETABKfuMude x9ZQ== X-Gm-Message-State: AOAM531TNWFDzjAuC1EuaR/7B7ppzEt/LGURA3OsMXpWFJd8nSBGKD8p mkOim8L35vI0xwTGXZxSxTcd X-Google-Smtp-Source: ABdhPJyL2MP1U4TFzNwYyn2DTPsXQ1gifT4OpKrdbzOPbdutN3Ydkn1OjNc48gJo9lPRnzHpmhmlXA== X-Received: by 2002:a17:90a:d98f:: with SMTP id d15mr5337754pjv.51.1622635687528; Wed, 02 Jun 2021 05:08:07 -0700 (PDT) Received: from localhost.localdomain ([120.138.12.54]) by smtp.gmail.com with ESMTPSA id h18sm12502907pgl.87.2021.06.02.05.08.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Jun 2021 05:08:07 -0700 (PDT) From: Manivannan Sadhasivam To: lorenzo.pieralisi@arm.com, robh@kernel.org, bhelgaas@google.com Cc: bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH 1/3] dt-bindings: pci: Add devicetree binding for Qualcomm PCIe EP controller Date: Wed, 2 Jun 2021 17:37:50 +0530 Message-Id: <20210602120752.46154-2-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210602120752.46154-1-manivannan.sadhasivam@linaro.org> References: <20210602120752.46154-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add devicetree binding for Qualcomm PCIe EP controller used in platforms like SDX55. The EP controller is based on the Designware core with Qualcomm specific wrappers. Signed-off-by: Manivannan Sadhasivam --- .../devicetree/bindings/pci/qcom,pcie-ep.yaml | 139 ++++++++++++++++++ 1 file changed, 139 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml new file mode 100644 index 000000000000..0f9140e93bcb --- /dev/null +++ b/Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml @@ -0,0 +1,139 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pci/qcom,pcie-ep.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Qualcomm PCIe Endpoint Controller binding + +maintainers: + - Manivannan Sadhasivam + +allOf: + - $ref: "pci-ep.yaml#" + +properties: + compatible: + const: qcom,pcie-ep + + reg: + items: + - description: Designware PCIe registers + - description: External local bus interface registers + - description: Address Translation Unit (ATU) registers + - description: Memory region used to map remote RC address space + - description: Qualcomm specific PARF configuration registers + - description: Qualcomm specific TCSR registers + + reg-names: + items: + - const: dbi + - const: elbi + - const: atu + - const: addr_space + - const: parf + - const: tcsr + + clocks: + items: + - description: PCIe CFG AHB clock + - description: PCIe Auxiliary clock + - description: PCIe Master AXI clock + - description: PCIe Slave AXI clock + - description: PCIe Reference clock + - description: PCIe Sleep clock + - description: PCIe Slave Q2A AXI clock + + clock-names: + items: + - const: cfg + - const: aux + - const: bus_master + - const: bus_slave + - const: ref + - const: sleep + - const: slave_q2a + + interrupts: + maxItems: 1 + description: PCIe Global interrupt + + interrupt-names: + const: int_global + + perst-gpios: + description: PCIe endpoint reset GPIO + maxItems: 1 + + wake-gpios: + description: PCIe endpoint wake GPIO + maxItems: 1 + + resets: + maxItems: 1 + + reset-names: + const: core_reset + + power-domains: + maxItems: 1 + + phys: + maxItems: 1 + + phy-names: + const: pciephy + +required: + - compatible + - reg + - reg-names + - clocks + - clock-names + - interrupts + - interrupt-names + - perst-gpios + - resets + - reset-names + - power-domains + +unevaluatedProperties: false + +examples: + - | + #include + #include + #include + pcie_ep: pcie-ep@40000000 { + compatible = "qcom,pcie-ep"; + + reg = <0x40000000 0xf1d>, + <0x40000f20 0xc8>, + <0x40001000 0x1000>, + <0x42000000 0x1000>, + <0x01c00000 0x3000>, + <0x01fcb000 0x1000>; + reg-names = "dbi", "elbi", "atu", "addr_space", "parf", "tcsr"; + + clocks = <&gcc GCC_PCIE_CFG_AHB_CLK>, + <&gcc GCC_PCIE_AUX_CLK>, + <&gcc GCC_PCIE_MSTR_AXI_CLK>, + <&gcc GCC_PCIE_SLV_AXI_CLK>, + <&gcc GCC_PCIE_0_CLKREF_CLK>, + <&gcc GCC_PCIE_SLEEP_CLK>, + <&gcc GCC_PCIE_SLV_Q2A_AXI_CLK>; + clock-names = "cfg", "aux", "bus_master", "bus_slave", + "ref", "sleep", "slave_q2a"; + + interrupts = ; + interrupt-names = "int_global"; + perst-gpios = <&tlmm 57 GPIO_ACTIVE_HIGH>; + wake-gpios = <&tlmm 53 GPIO_ACTIVE_LOW>; + resets = <&gcc GCC_PCIE_BCR>; + reset-names = "core_reset"; + power-domains = <&gcc PCIE_GDSC>; + phys = <&pcie0_lane>; + phy-names = "pciephy"; + max-link-speed = <3>; + num-lanes = <2>; + }; From patchwork Wed Jun 2 12:07:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 12294011 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 108DEC47099 for ; 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Wed, 02 Jun 2021 05:08:11 -0700 (PDT) Received: from localhost.localdomain ([120.138.12.54]) by smtp.gmail.com with ESMTPSA id h18sm12502907pgl.87.2021.06.02.05.08.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Jun 2021 05:08:10 -0700 (PDT) From: Manivannan Sadhasivam To: lorenzo.pieralisi@arm.com, robh@kernel.org, bhelgaas@google.com Cc: bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam , Siddartha Mohanadoss Subject: [PATCH 2/3] PCI: dwc: Add Qualcomm PCIe Endpoint controller driver Date: Wed, 2 Jun 2021 17:37:51 +0530 Message-Id: <20210602120752.46154-3-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210602120752.46154-1-manivannan.sadhasivam@linaro.org> References: <20210602120752.46154-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add driver support for Qualcomm PCIe Endpoint controller driver based on the Designware core with added Qualcomm specific wrapper around the core. The driver support is very basic such that it supports only enumeration, PCIe read/write, and MSI. There is no ASPM and PM support for now but these will be added later. The driver is capable of using the PERST# and WAKE# side-band GPIOs for operation and written on top of the DWC PCI framework. Co-developed-by: Siddartha Mohanadoss Signed-off-by: Siddartha Mohanadoss [mani: restructured the driver and fixed several bugs for upstream] Signed-off-by: Manivannan Sadhasivam Reported-by: kernel test robot --- drivers/pci/controller/dwc/Kconfig | 10 + drivers/pci/controller/dwc/Makefile | 1 + drivers/pci/controller/dwc/pcie-qcom-ep.c | 788 ++++++++++++++++++++++ 3 files changed, 799 insertions(+) create mode 100644 drivers/pci/controller/dwc/pcie-qcom-ep.c diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig index 423d35872ce4..32e735b1fd85 100644 --- a/drivers/pci/controller/dwc/Kconfig +++ b/drivers/pci/controller/dwc/Kconfig @@ -180,6 +180,16 @@ config PCIE_QCOM PCIe controller uses the DesignWare core plus Qualcomm-specific hardware wrappers. +config PCIE_QCOM_EP + bool "Qualcomm PCIe controller - Endpoint mode" + depends on OF && (ARCH_QCOM || COMPILE_TEST) + depends on PCI_ENDPOINT + select PCIE_DW_EP + help + Say Y here to enable support for the PCIe controllers on Qualcomm SoCs + to work in endpoint mode. The PCIe controller uses the DesignWare core + plus Qualcomm-specific hardware wrappers. + config PCIE_ARMADA_8K bool "Marvell Armada-8K PCIe controller" depends on ARCH_MVEBU || COMPILE_TEST diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile index eca805c1a023..abb27642d46b 100644 --- a/drivers/pci/controller/dwc/Makefile +++ b/drivers/pci/controller/dwc/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone.o obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o obj-$(CONFIG_PCI_LAYERSCAPE_EP) += pci-layerscape-ep.o obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o +obj-$(CONFIG_PCIE_QCOM_EP) += pcie-qcom-ep.o obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o obj-$(CONFIG_PCIE_INTEL_GW) += pcie-intel-gw.o diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c new file mode 100644 index 000000000000..84e8f3b40c1c --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -0,0 +1,788 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Qualcomm PCIe Endpoint controller driver + * + * Copyright (c) 2020, The Linux Foundation. All rights reserved. + * Author: Siddartha Mohanadoss +#include +#include +#include +#include +#include +#include + +#include "pcie-designware.h" + +/* PARF registers */ +#define PARF_SYS_CTRL 0x00 +#define PARF_DB_CTRL 0x10 +#define PARF_PM_CTRL 0x20 +#define PARF_DEBUG_INT_EN 0x190 +#define PARF_AXI_MSTR_RD_HALT_NO_WRITES 0x1a4 +#define PARF_AXI_MSTR_WR_ADDR_HALT 0x1a8 +#define PARF_Q2A_FLUSH 0x1aC +#define PARF_LTSSM 0x1b0 +#define PARF_CFG_BITS 0x210 +#define PARF_INT_ALL_STATUS 0x224 +#define PARF_INT_ALL_CLEAR 0x228 +#define PARF_INT_ALL_MASK 0x22c +#define PARF_SLV_ADDR_MSB_CTRL 0x2c0 +#define PARF_DBI_BASE_ADDR 0x350 +#define PARF_DBI_BASE_ADDR_HI 0x354 +#define PARF_SLV_ADDR_SPACE_SIZE 0x358 +#define PARF_SLV_ADDR_SPACE_SIZE_HI 0x35c +#define PARF_ATU_BASE_ADDR 0x634 +#define PARF_ATU_BASE_ADDR_HI 0x638 +#define PARF_SRIS_MODE 0x644 +#define PARF_DEVICE_TYPE 0x1000 +#define PARF_BDF_TO_SID_CFG 0x2c00 + +/* ELBI registers */ +#define ELBI_SYS_STTS 0x08 + +/* DBI registers */ +#define DBI_CAP_ID_NXT_PTR 0x40 +#define DBI_CON_STATUS 0x44 +#define DBI_DEVICE_CAPABILITIES 0x74 +#define DBI_LINK_CAPABILITIES 0x7c +#define DBI_LINK_CONTROL2_LINK_STATUS2 0xa0 +#define DBI_L1SUB_CAPABILITY 0x234 +#define DBI_ACK_F_ASPM_CTRL 0x70c +#define DBI_GEN3_RELATED_OFF 0x890 +#define DBI_AUX_CLK_FREQ 0xb40 + +#define DBI_L0S_ACCPT_LATENCY_MASK GENMASK(8, 6) +#define DBI_L1_ACCPT_LATENCY_MASK GENMASK(11, 9) +#define DBI_L0S_EXIT_LATENCY_MASK GENMASK(14, 12) +#define DBI_L1_EXIT_LATENCY_MASK GENMASK(17, 15) +#define DBI_ACK_N_FTS_MASK GENMASK(15, 8) + +/* TCSR registers */ +#define TCSR_PCIE_PERST_EN 0x258 +#define TCSR_PERST_SEPARATION_ENABLE 0x270 + +#define XMLH_LINK_UP 0x400 +#define CORE_RESET_TIME_US_MIN 1000 +#define CORE_RESET_TIME_US_MAX 1005 +#define WAKE_DELAY_US 2000 /* 2 ms */ + +#define to_pcie_ep(x) dev_get_drvdata((x)->dev) + +enum qcom_pcie_ep_link_status { + QCOM_PCIE_EP_LINK_DISABLED, + QCOM_PCIE_EP_LINK_ENABLED, + QCOM_PCIE_EP_LINK_UP, + QCOM_PCIE_EP_LINK_DOWN, +}; + +enum qcom_pcie_ep_irq { + QCOM_PCIE_EP_INT_RESERVED, + QCOM_PCIE_EP_INT_LINK_DOWN, + QCOM_PCIE_EP_INT_BME, + QCOM_PCIE_EP_INT_PM_TURNOFF, + QCOM_PCIE_EP_INT_DEBUG, + QCOM_PCIE_EP_INT_LTR, + QCOM_PCIE_EP_INT_MHI_Q6, + QCOM_PCIE_EP_INT_MHI_A7, + QCOM_PCIE_EP_INT_DSTATE_CHANGE, + QCOM_PCIE_EP_INT_L1SUB_TIMEOUT, + QCOM_PCIE_EP_INT_MMIO_WRITE, + QCOM_PCIE_EP_INT_CFG_WRITE, + QCOM_PCIE_EP_INT_BRIDGE_FLUSH_N, + QCOM_PCIE_EP_INT_LINK_UP, + QCOM_PCIE_EP_INT_AER_LEGACY, + QCOM_PCIE_EP_INT_PLS_ERR, + QCOM_PCIE_EP_INT_PME_LEGACY, + QCOM_PCIE_EP_INT_PLS_PME, + QCOM_PCIE_EP_INT_MAX, +}; + +static struct clk_bulk_data qcom_pcie_ep_clks[] = { + { .id = "cfg" }, + { .id = "aux" }, + { .id = "bus_master" }, + { .id = "bus_slave" }, + { .id = "ref" }, + { .id = "sleep" }, + { .id = "slave_q2a" }, +}; + +struct qcom_pcie_ep { + struct dw_pcie pci; + + void __iomem *parf; + void __iomem *elbi; + void __iomem *tcsr; + + struct reset_control *core_reset; + struct gpio_desc *reset; + struct gpio_desc *wake; + struct phy *phy; + + resource_size_t dbi_phys; + resource_size_t atu_phys; + + enum qcom_pcie_ep_link_status link_status; + int global_irq; + int perst_irq; +}; + +static void qcom_pcie_ep_enable_ltssm(struct qcom_pcie_ep *pcie_ep) +{ + u32 reg; + + reg = readl(pcie_ep->parf + PARF_LTSSM); + reg |= BIT(8); + writel_relaxed(reg, pcie_ep->parf + PARF_LTSSM); +} + +static int qcom_pcie_ep_core_reset(struct qcom_pcie_ep *pcie_ep) +{ + struct dw_pcie *pci = &pcie_ep->pci; + struct device *dev = pci->dev; + int ret = 0; + + ret = reset_control_assert(pcie_ep->core_reset); + if (ret) { + dev_err(dev, "Cannot assert core reset\n"); + return ret; + } + + usleep_range(CORE_RESET_TIME_US_MIN, CORE_RESET_TIME_US_MAX); + + ret = reset_control_deassert(pcie_ep->core_reset); + if (ret) { + dev_err(dev, "Cannot de-assert core reset\n"); + return ret; + } + + usleep_range(CORE_RESET_TIME_US_MIN, CORE_RESET_TIME_US_MAX); + + return 0; +} + +/* + * Delatch PERST_EN and PERST_SEPARATION_ENABLE with TCSR to avoid + * device reset during host reboot and hibernation. The driver is + * expected to handle this situation. + */ +static void qcom_pcie_ep_configure_tcsr(struct qcom_pcie_ep *pcie_ep) +{ + u32 reg; + + reg = readl(pcie_ep->tcsr + TCSR_PCIE_PERST_EN); + writel_relaxed(0x0, pcie_ep->tcsr + TCSR_PCIE_PERST_EN); + + reg = readl(pcie_ep->tcsr + TCSR_PERST_SEPARATION_ENABLE); + writel_relaxed(0x0, pcie_ep->tcsr + TCSR_PERST_SEPARATION_ENABLE); +} + +static int qcom_pcie_ep_enable_resources(struct qcom_pcie_ep *pcie_ep) +{ + struct dw_pcie *pci = &pcie_ep->pci; + struct device *dev = pci->dev; + int ret; + + ret = clk_bulk_prepare_enable(ARRAY_SIZE(qcom_pcie_ep_clks), + qcom_pcie_ep_clks); + if (ret) { + dev_err(dev, "Failed to enable clocks: %d\n", ret); + return ret; + } + + return 0; +} + +static void qcom_pcie_ep_disable_resources(struct qcom_pcie_ep *pcie_ep) +{ + clk_bulk_disable_unprepare(ARRAY_SIZE(qcom_pcie_ep_clks), + qcom_pcie_ep_clks); +} + +static void qcom_pcie_ep_configure_irq(struct qcom_pcie_ep *pcie_ep) +{ + u32 val; + + writel_relaxed(0, pcie_ep->parf + PARF_INT_ALL_MASK); + val = BIT(QCOM_PCIE_EP_INT_LINK_DOWN) | + BIT(QCOM_PCIE_EP_INT_BME) | + BIT(QCOM_PCIE_EP_INT_PM_TURNOFF) | + BIT(QCOM_PCIE_EP_INT_DSTATE_CHANGE) | + BIT(QCOM_PCIE_EP_INT_LINK_UP); + writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_MASK); +} + +static int qcom_pcie_ep_core_init(struct qcom_pcie_ep *pcie_ep) +{ + struct dw_pcie *pci = &pcie_ep->pci; + u32 val; + + /* Disable BDF to SID mapping */ + val = readl_relaxed(pcie_ep->parf + PARF_BDF_TO_SID_CFG); + val |= BIT(0); + writel_relaxed(val, pcie_ep->parf + PARF_BDF_TO_SID_CFG); + + /* enable debug IRQ */ + writel_relaxed((BIT(3) | BIT(2) | BIT(1)), + pcie_ep->parf + PARF_DEBUG_INT_EN); + + /* Configure PCIe to endpoint mode */ + writel_relaxed(0x0, pcie_ep->parf + PARF_DEVICE_TYPE); + + /* Configure PCIe core to support 1GB aperture */ + writel_relaxed(0x40000000, pcie_ep->parf + PARF_SLV_ADDR_SPACE_SIZE); + + /* Allow entering L1 state */ + val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); + val &= ~BIT(5); + writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL); + + /* Configure Slave, DBI and iATU base addresses */ + writel_relaxed(BIT(0), pcie_ep->parf + PARF_SLV_ADDR_MSB_CTRL); + writel_relaxed(0x200, pcie_ep->parf + PARF_SLV_ADDR_SPACE_SIZE_HI); + writel_relaxed(0x0, pcie_ep->parf + PARF_SLV_ADDR_SPACE_SIZE); + writel_relaxed(0x100, pcie_ep->parf + PARF_DBI_BASE_ADDR_HI); + writel_relaxed(pcie_ep->dbi_phys, pcie_ep->parf + PARF_DBI_BASE_ADDR); + writel_relaxed(0x100, pcie_ep->parf + PARF_ATU_BASE_ADDR_HI); + writel_relaxed(pcie_ep->atu_phys, pcie_ep->parf + PARF_ATU_BASE_ADDR); + + /* Read halts write */ + writel_relaxed(0x0, pcie_ep->parf + PARF_AXI_MSTR_RD_HALT_NO_WRITES); + /* Write after write halt */ + writel_relaxed(BIT(31), pcie_ep->parf + PARF_AXI_MSTR_WR_ADDR_HALT); + /* Q2A flush disable */ + writel_relaxed(0, pcie_ep->parf + PARF_Q2A_FLUSH); + + /* Disable the DBI Wakeup */ + writel_relaxed(BIT(11), pcie_ep->parf + PARF_SYS_CTRL); + /* Disable the debouncers */ + writel_relaxed(0x73, pcie_ep->parf + PARF_DB_CTRL); + /* Disable core clock CGC */ + writel_relaxed(BIT(6), pcie_ep->parf + PARF_SYS_CTRL); + /* Set AUX power to be on */ + writel_relaxed(BIT(4), pcie_ep->parf + PARF_SYS_CTRL); + /* Request to exit from L1SS for MSI and LTR MSG */ + writel_relaxed(BIT(1), pcie_ep->parf + PARF_CFG_BITS); + + dw_pcie_dbi_ro_wr_en(pci); + + /* Set the PMC Register - to support PME in D0/D3hot/D3cold */ + val = dw_pcie_readl_dbi(pci, DBI_CAP_ID_NXT_PTR); + val |= BIT(31) | BIT(30) | BIT(27); + dw_pcie_writel_dbi(pci, DBI_CAP_ID_NXT_PTR, val); + + /* Set the Endpoint L0s Acceptable Latency to 1us (max) */ + val = dw_pcie_readl_dbi(pci, DBI_DEVICE_CAPABILITIES); + val |= FIELD_PREP(DBI_L0S_ACCPT_LATENCY_MASK, 0x7); + dw_pcie_writel_dbi(pci, DBI_DEVICE_CAPABILITIES, val); + + /* Set the Endpoint L1 Acceptable Latency to 1us (max) */ + val = dw_pcie_readl_dbi(pci, DBI_DEVICE_CAPABILITIES); + val |= FIELD_PREP(DBI_L1_ACCPT_LATENCY_MASK, 0x7); + dw_pcie_writel_dbi(pci, DBI_DEVICE_CAPABILITIES, val); + + /* Set the L0s Exit Latency to 2us-4us = 0x6 */ + val = dw_pcie_readl_dbi(pci, DBI_LINK_CAPABILITIES); + val |= FIELD_PREP(DBI_L0S_EXIT_LATENCY_MASK, 0x6); + dw_pcie_writel_dbi(pci, DBI_LINK_CAPABILITIES, val); + + /* Set the L1 Exit Latency to be 32us-64 us = 0x6 */ + val = dw_pcie_readl_dbi(pci, DBI_LINK_CAPABILITIES); + val |= FIELD_PREP(DBI_L1_EXIT_LATENCY_MASK, 0x6); + dw_pcie_writel_dbi(pci, DBI_LINK_CAPABILITIES, val); + + /* L1ss is supported */ + val = dw_pcie_readl_dbi(pci, DBI_L1SUB_CAPABILITY); + val |= 0x1f; + dw_pcie_writel_dbi(pci, DBI_L1SUB_CAPABILITY, val); + + /* Enable Clock Power Management */ + val = dw_pcie_readl_dbi(pci, DBI_LINK_CAPABILITIES); + val |= BIT(18); + dw_pcie_writel_dbi(pci, DBI_LINK_CAPABILITIES, val); + + dw_pcie_dbi_ro_wr_dis(pci); + + /* Set FTS value to match the PHY setting */ + val = dw_pcie_readl_dbi(pci, DBI_ACK_F_ASPM_CTRL); + val |= FIELD_PREP(DBI_ACK_N_FTS_MASK, 0x80); + dw_pcie_writel_dbi(pci, DBI_ACK_F_ASPM_CTRL, val); + + dw_pcie_writel_dbi(pci, DBI_AUX_CLK_FREQ, 0x14); + + /* Prevent L1ss wakeup after 100ms */ + val = dw_pcie_readl_dbi(pci, DBI_GEN3_RELATED_OFF); + val &= ~BIT(0); + dw_pcie_writel_dbi(pci, DBI_GEN3_RELATED_OFF, val); + + /* Disable SRIS_MODE */ + val = readl_relaxed(pcie_ep->parf + PARF_SRIS_MODE); + val &= ~BIT(0); + writel_relaxed(val, pcie_ep->parf + PARF_SRIS_MODE); + + qcom_pcie_ep_configure_irq(pcie_ep); + + return 0; +} + +static int qcom_pcie_confirm_linkup(struct dw_pcie *pci) +{ + struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); + u32 reg; + + reg = readl_relaxed(pcie_ep->elbi + ELBI_SYS_STTS); + + return reg & XMLH_LINK_UP; +} + +static int qcom_pcie_start_link(struct dw_pcie *pci) +{ + struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); + + enable_irq(pcie_ep->perst_irq); + + return 0; +} + +static int qcom_pcie_establish_link(struct dw_pcie *pci) +{ + struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); + struct pci_epc *epc = pci->ep.epc; + struct pci_epf_bar epf_bar; + struct device *dev = pci->dev; + int ret; + + if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_ENABLED) { + dev_dbg(dev, "Link is already enabled\n"); + return 0; + } + + /* Enable power and clocks */ + ret = qcom_pcie_ep_enable_resources(pcie_ep); + if (ret) { + dev_err(dev, "Failed to enable resources: %d\n", ret); + return ret; + } + + /* Perform controller reset */ + ret = qcom_pcie_ep_core_reset(pcie_ep); + if (ret) { + dev_err(dev, "Failed to reset the core: %d\n", ret); + goto err_disable_resources; + } + + /* Initialize PHY */ + ret = phy_init(pcie_ep->phy); + if (ret) { + dev_err(dev, "Failed to initialize PHY: %d\n", ret); + goto err_disable_resources; + } + + /* Power ON PHY */ + ret = phy_power_on(pcie_ep->phy); + if (ret) { + dev_err(dev, "Failed to Power ON PHY: %d\n", ret); + goto err_phy_exit; + } + + /* Assert WAKE# to RC to indicate device is ready */ + gpiod_set_value_cansleep(pcie_ep->wake, 0); + usleep_range(WAKE_DELAY_US, WAKE_DELAY_US + 500); + gpiod_set_value_cansleep(pcie_ep->wake, 1); + + /* Configure TCSR for PERST separation */ + qcom_pcie_ep_configure_tcsr(pcie_ep); + + /* Initialize the controller */ + ret = qcom_pcie_ep_core_init(pcie_ep); + if (ret) { + dev_err(dev, "Failed to init controller: %d\n", ret); + goto err_phy_power_off; + } + + ret = dw_pcie_ep_init_complete(&pcie_ep->pci.ep); + if (ret) { + dev_err(dev, "Failed to complete initialization: %d\n", ret); + goto err_phy_power_off; + } + + dw_pcie_ep_init_notify(&pcie_ep->pci.ep); + + /* Enable LTSSM */ + qcom_pcie_ep_enable_ltssm(pcie_ep); + + return 0; + +err_phy_power_off: + phy_power_off(pcie_ep->phy); +err_phy_exit: + phy_exit(pcie_ep->phy); +err_disable_resources: + qcom_pcie_ep_disable_resources(pcie_ep); + + return ret; +} + +static void qcom_pcie_disable_link(struct dw_pcie *pci) +{ + struct qcom_pcie_ep *pcie_ep = to_pcie_ep(pci); + struct device *dev = pci->dev; + + if (pcie_ep->link_status == QCOM_PCIE_EP_LINK_DISABLED) { + dev_dbg(dev, "Link is already disabled\n"); + return; + } + + phy_power_off(pcie_ep->phy); + phy_exit(pcie_ep->phy); + qcom_pcie_ep_disable_resources(pcie_ep); + pcie_ep->link_status = QCOM_PCIE_EP_LINK_DISABLED; +} + +/* Common DWC controller ops */ +static const struct dw_pcie_ops pci_ops = { + .link_up = qcom_pcie_confirm_linkup, + .start_link = qcom_pcie_start_link, + .stop_link = qcom_pcie_disable_link, +}; + +static int qcom_pcie_ep_get_io_resources(struct platform_device *pdev, + struct qcom_pcie_ep *pcie_ep) +{ + struct device *dev = &pdev->dev; + struct dw_pcie *pci = &pcie_ep->pci; + struct resource *res; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi"); + pci->dbi_base = devm_pci_remap_cfg_resource(dev, res); + if (IS_ERR(pci->dbi_base)) + return PTR_ERR(pci->dbi_base); + pci->dbi_base2 = pci->dbi_base; + pcie_ep->dbi_phys = res->start; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi"); + pcie_ep->elbi = devm_pci_remap_cfg_resource(dev, res); + if (IS_ERR(pcie_ep->elbi)) + return PTR_ERR(pcie_ep->elbi); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "parf"); + pcie_ep->parf = devm_ioremap_resource(dev, res); + if (IS_ERR(pcie_ep->parf)) + return PTR_ERR(pcie_ep->parf); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "tcsr"); + pcie_ep->tcsr = devm_ioremap_resource(dev, res); + if (IS_ERR(pcie_ep->tcsr)) + return PTR_ERR(pcie_ep->tcsr); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu"); + pci->atu_base = devm_pci_remap_cfg_resource(dev, res); + if (IS_ERR(pci->atu_base)) + return PTR_ERR(pci->atu_base); + pcie_ep->atu_phys = res->start; + + return 0; +} + +static int qcom_pcie_ep_get_resources(struct platform_device *pdev, + struct qcom_pcie_ep *pcie_ep) +{ + struct device *dev = &pdev->dev; + int ret; + + ret = qcom_pcie_ep_get_io_resources(pdev, pcie_ep); + if (ret) { + dev_err(&pdev->dev, "failed to get io resources %d\n", ret); + return ret; + } + + /* Enable GDSC power domain */ + ret = dev_pm_domain_attach(dev, true); + if (ret) + return ret; + + ret = devm_clk_bulk_get(dev, ARRAY_SIZE(qcom_pcie_ep_clks), + qcom_pcie_ep_clks); + if (ret) { + dev_err(dev, "Failed to get clocks: %d\n", ret); + return ret; + } + + pcie_ep->core_reset = devm_reset_control_get_exclusive(dev, "core_reset"); + if (IS_ERR(pcie_ep->core_reset)) + return PTR_ERR(pcie_ep->core_reset); + + pcie_ep->reset = devm_gpiod_get(dev, "perst", GPIOD_IN); + if (IS_ERR(pcie_ep->reset)) + return PTR_ERR(pcie_ep->reset); + + pcie_ep->wake = devm_gpiod_get_optional(dev, "wake", GPIOD_OUT_HIGH); + if (IS_ERR(pcie_ep->wake)) + return PTR_ERR(pcie_ep->wake); + + pcie_ep->phy = devm_phy_optional_get(&pdev->dev, "pciephy"); + if (IS_ERR(pcie_ep->phy)) + ret = PTR_ERR(pcie_ep->phy); + + return ret; +} + +/* TODO: Notify clients about PCIe state change */ +static irqreturn_t qcom_pcie_ep_global_threaded_irq(int irq, void *data) +{ + struct qcom_pcie_ep *pcie_ep = data; + struct dw_pcie *pci = &pcie_ep->pci; + struct device *dev = pci->dev; + u32 status = readl(pcie_ep->parf + PARF_INT_ALL_STATUS); + u32 mask = readl(pcie_ep->parf + PARF_INT_ALL_MASK); + u32 dstate, event, val; + + writel_relaxed(status, pcie_ep->parf + PARF_INT_ALL_CLEAR); + status &= mask; + + for (event = 1; event < QCOM_PCIE_EP_INT_MAX; event++) { + if (status & BIT(event)) { + switch (event) { + case QCOM_PCIE_EP_INT_LINK_DOWN: + dev_dbg(dev, "Received Linkdown event\n"); + pcie_ep->link_status = QCOM_PCIE_EP_LINK_DOWN; + break; + case QCOM_PCIE_EP_INT_BME: + dev_dbg(dev, "Received BME event. Link is enabled!\n"); + pcie_ep->link_status = QCOM_PCIE_EP_LINK_ENABLED; + break; + case QCOM_PCIE_EP_INT_PM_TURNOFF: + dev_dbg(dev, "Received PM Turn-off event! Entering L23\n"); + val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); + val |= BIT(2); + writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL); + break; + case QCOM_PCIE_EP_INT_DSTATE_CHANGE: + dstate = dw_pcie_readl_dbi(pci, DBI_CON_STATUS) & 0x3; + dev_dbg(dev, "Received D%d state event\n", dstate); + if (dstate == 3) { + val = readl_relaxed(pcie_ep->parf + PARF_PM_CTRL); + val |= BIT(1); + writel_relaxed(val, pcie_ep->parf + PARF_PM_CTRL); + } + /* Handle D0 state change */ + break; + case QCOM_PCIE_EP_INT_LINK_UP: + dev_dbg(dev, "Received Linkup event. Enumeration complete!\n"); + dw_pcie_ep_linkup(&pci->ep); + pcie_ep->link_status = QCOM_PCIE_EP_LINK_UP; + break; + default: + dev_err(dev, "Received unknown event: %d\n", event); + break; + } + } + } + + return IRQ_HANDLED; +} + +static irqreturn_t qcom_pcie_ep_perst_threaded_irq(int irq, void *data) +{ + struct qcom_pcie_ep *pcie_ep = data; + struct dw_pcie *pci = &pcie_ep->pci; + struct device *dev = pci->dev; + u32 perst; + + perst = gpiod_get_value(pcie_ep->reset); + + if (perst) { + /* Start link training */ + dev_dbg(dev, "PERST de-asserted by host. Starting link training!\n"); + qcom_pcie_establish_link(pci); + } else { + /* Shutdown the link if the link is already on */ + dev_dbg(dev, "PERST asserted by host. Shutting down the PCIe link!\n"); + qcom_pcie_disable_link(pci); + } + + /* Set trigger type based on the next expected value of perst gpio */ + irq_set_irq_type(gpiod_to_irq(pcie_ep->reset), + (perst ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH)); + + return IRQ_HANDLED; +} + +static int qcom_pcie_ep_enable_irq_resources(struct platform_device *pdev, + struct qcom_pcie_ep *pcie_ep) +{ + int irq, ret; + + irq = platform_get_irq_byname(pdev, "int_global"); + if (irq < 0) { + dev_err(&pdev->dev, "Failed to get Global IRQ\n"); + return irq; + } + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + qcom_pcie_ep_global_threaded_irq, + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, + "int_global", pcie_ep); + if (ret) { + dev_err(&pdev->dev, "Failed to request Global IRQ\n"); + return ret; + } + + pcie_ep->perst_irq = gpiod_to_irq(pcie_ep->reset); + irq_set_status_flags(pcie_ep->perst_irq, IRQ_NOAUTOEN); + ret = devm_request_threaded_irq(&pdev->dev, pcie_ep->perst_irq, NULL, + qcom_pcie_ep_perst_threaded_irq, + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, + "ep_pcie_perst", pcie_ep); + if (ret) { + dev_err(&pdev->dev, "Failed to request PERST IRQ\n"); + return ret; + } + + return 0; +} + +static int qcom_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, + enum pci_epc_irq_type type, u16 interrupt_num) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + + switch (type) { + case PCI_EPC_IRQ_LEGACY: + return dw_pcie_ep_raise_legacy_irq(ep, func_no); + case PCI_EPC_IRQ_MSI: + return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num); + default: + dev_err(pci->dev, "Unknown IRQ type\n"); + return -EINVAL; + } +} + +static const struct pci_epc_features qcom_pcie_epc_features = { + .linkup_notifier = true, + .core_init_notifier = true, + .msi_capable = true, + .msix_capable = false, +}; + +static const struct pci_epc_features * +qcom_pcie_epc_get_features(struct dw_pcie_ep *pci_ep) +{ + return &qcom_pcie_epc_features; +} + +static void qcom_pcie_ep_init(struct dw_pcie_ep *ep) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + enum pci_barno bar; + + for (bar = BAR_0; bar <= BAR_5; bar++) + dw_pcie_ep_reset_bar(pci, bar); +} + +static struct dw_pcie_ep_ops pci_ep_ops = { + .ep_init = qcom_pcie_ep_init, + .raise_irq = qcom_pcie_ep_raise_irq, + .get_features = qcom_pcie_epc_get_features, +}; + +static const struct of_device_id qcom_pcie_ep_match[] = { + { .compatible = "qcom,pcie-ep", }, + { } +}; + +static int qcom_pcie_ep_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct qcom_pcie_ep *pcie_ep; + int ret; + + pcie_ep = devm_kzalloc(dev, sizeof(*pcie_ep), GFP_KERNEL); + if (!pcie_ep) + return -ENOMEM; + + pcie_ep->pci.dev = dev; + pcie_ep->pci.ops = &pci_ops; + pcie_ep->pci.ep.ops = &pci_ep_ops; + + ret = qcom_pcie_ep_get_resources(pdev, pcie_ep); + if (ret) { + dev_err(dev, "Failed to get resources:%d\n", ret); + return ret; + } + + /* Enable power and clocks */ + ret = qcom_pcie_ep_enable_resources(pcie_ep); + if (ret) { + dev_err(dev, "Failed to enable resources: %d\n", ret); + return ret; + } + + /* Perform controller reset */ + ret = qcom_pcie_ep_core_reset(pcie_ep); + if (ret) { + dev_err(dev, "Failed to reset the core: %d\n", ret); + goto err_disable_resources; + } + + /* Initialize PHY */ + ret = phy_init(pcie_ep->phy); + if (ret) { + dev_err(dev, "Failed to initialize PHY: %d\n", ret); + goto err_disable_resources; + } + + /* PHY needs to be powered on for dw_pcie_ep_init() */ + ret = phy_power_on(pcie_ep->phy); + if (ret) { + dev_err(dev, "Failed to Power ON PHY: %d\n", ret); + goto err_phy_exit; + } + + platform_set_drvdata(pdev, pcie_ep); + + ret = qcom_pcie_ep_enable_irq_resources(pdev, pcie_ep); + if (ret) { + dev_err(dev, "Failed to get IRQ resources %d\n", ret); + goto err_phy_power_off; + } + + ret = dw_pcie_ep_init(&pcie_ep->pci.ep); + if (ret) { + dev_err(dev, "Failed to initialize endpoint:%d\n", ret); + goto err_phy_power_off; + } + + enable_irq(pcie_ep->perst_irq); + return 0; + +err_phy_power_off: + phy_power_off(pcie_ep->phy); +err_phy_exit: + phy_exit(pcie_ep->phy); +err_disable_resources: + qcom_pcie_ep_disable_resources(pcie_ep); + + return ret; +} + +static struct platform_driver qcom_pcie_ep_driver = { + .probe = qcom_pcie_ep_probe, + .driver = { + .name = "qcom-pcie-ep", + .suppress_bind_attrs = true, + .of_match_table = qcom_pcie_ep_match, + }, +}; +builtin_platform_driver(qcom_pcie_ep_driver); + +MODULE_AUTHOR("Siddartha Mohanadoss "); +MODULE_AUTHOR("Manivannan Sadhasivam "); 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Wed, 02 Jun 2021 05:08:14 -0700 (PDT) From: Manivannan Sadhasivam To: lorenzo.pieralisi@arm.com, robh@kernel.org, bhelgaas@google.com Cc: bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH 3/3] MAINTAINERS: Add entry for Qualcomm PCIe Endpoint driver and binding Date: Wed, 2 Jun 2021 17:37:52 +0530 Message-Id: <20210602120752.46154-4-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210602120752.46154-1-manivannan.sadhasivam@linaro.org> References: <20210602120752.46154-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add MAINTAINERS entry for Qualcomm PCIe Endpoint driver and its devicetree binding. While at it, let's also fix the PCIE RC entry to cover only the RC driver. Signed-off-by: Manivannan Sadhasivam --- MAINTAINERS | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/MAINTAINERS b/MAINTAINERS index bd7aff0c120f..cdd370138b9f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14254,7 +14254,15 @@ M: Stanimir Varbanov L: linux-pci@vger.kernel.org L: linux-arm-msm@vger.kernel.org S: Maintained -F: drivers/pci/controller/dwc/*qcom* +F: drivers/pci/controller/dwc/pcie-qcom.c + +PCIE ENDPOINT DRIVER FOR QUALCOMM +M: Manivannan Sadhasivam +L: linux-pci@vger.kernel.org +L: linux-arm-msm@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml +F: drivers/pci/controller/dwc/pcie-qcom-ep.c PCIE DRIVER FOR ROCKCHIP M: Shawn Lin