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: 452624 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=ham 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 E9C70C47092 for ; Wed, 2 Jun 2021 12:08:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D11D0613B4 for ; Wed, 2 Jun 2021 12:08:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229682AbhFBMJx (ORCPT ); Wed, 2 Jun 2021 08:09:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229656AbhFBMJv (ORCPT ); Wed, 2 Jun 2021 08:09:51 -0400 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01540C06175F for ; Wed, 2 Jun 2021 05:08:08 -0700 (PDT) Received: by mail-pj1-x1034.google.com with SMTP id m13-20020a17090b068db02901656cc93a75so3330402pjz.3 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=TZkgcmNVrFZCJ8sqDQtXmbvR7Vt17Jp07B/zjJ1PuhrRSFlAXx4Cd/t3GbNdMMrzso qUc2Z8jx+l2+ySmQclKf0JJaGF5q0IHgpuiVnNXuPc5E0d6TTenn72dKZK3djugg2lew nwid9BVnRG8pKZtQtapoUNPbIJmblJ6z7+LzkHX51tH+v6q5jTpYIgX7DuthHEMGUXay Dlv1BBqtFvaNnTbGomirw5qiLRtCSs2PkPuO7pM8f8iyb2go+aw99+Ep6eeylA6abumX gaULbn+zYVJlKEeuFu4BLw/fCN8Y+x5YmD2MgkPObqHF3vTnyijOosMrXS806ZWhh0hD 6ZUQ== X-Gm-Message-State: AOAM530uN7PSM5QEW+ZdHjxedcykR9Z0tOJRrj3a7f4oNbHwtj9vZ8Rj SpVJFzVXbrqTI5MPxKjafazj 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-arm-msm@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: 452493 Delivered-To: patch@linaro.org Received: by 2002:a02:c735:0:0:0:0:0 with SMTP id h21csp508284jao; 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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 --- 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 -- 2.25.1 Reported-by: kernel test robot 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 "); +MODULE_DESCRIPTION("Qualcomm PCIe Endpoint controller driver"); +MODULE_LICENSE("GPL v2"); From patchwork Wed Jun 2 12:07:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 452494 Delivered-To: patch@linaro.org Received: by 2002:a02:c735:0:0:0:0:0 with SMTP id h21csp508499jao; Wed, 2 Jun 2021 05:08:34 -0700 (PDT) X-Google-Smtp-Source: ABdhPJy55Vbp543Qy+PFRSXO4m5+tK1lHjV9LedtUB3cO/JHgnbnP9N8TsmBZw3RQwBBijwX+Ig4 X-Received: by 2002:a17:906:2c4a:: with SMTP id f10mr26246091ejh.493.1622635714043; Wed, 02 Jun 2021 05:08:34 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1622635714; cv=none; d=google.com; s=arc-20160816; b=XbVie17LJxnpz6s7BxfZOa0tJeyY/wPWAgruWmvDniN8vJF13fjjjC+fxvv52pb0ID DgQdNosM1kAiJiKzsjjstLc4JlU9A5KGEX4H7+Q73qmt26GSBgHFvyzxUAFCCGFqa52v ttJnFXCXNOpSk6PLOUlnTlTmPol889tYjhp2Yvq9MMxj6S4fIZdb8Z8I8q7Jz6xP18Jd /EOkMeHJl2mg2GEBpd7zXP20yu/pipXQ70DQOF/GhYwIK/UNc9ND9u0OkCH4d2LgyIWj AwlL1vXci8g4T070v4pZPe6Izv96sMIkfo4Jm1F9EZwJ46ez4QUbECNSOcLUqz5my5uA O7gw== ARC-Message-Signature: i=1; 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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(-) -- 2.25.1 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