From patchwork Wed Aug 11 12:38:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Kishon Vijay Abraham I X-Patchwork-Id: 495479 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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 4D80AC4320E for ; Wed, 11 Aug 2021 12:39:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 325C76101D for ; Wed, 11 Aug 2021 12:39:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231639AbhHKMjc (ORCPT ); Wed, 11 Aug 2021 08:39:32 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:55362 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230420AbhHKMjb (ORCPT ); Wed, 11 Aug 2021 08:39:31 -0400 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 17BCd0BS018060; Wed, 11 Aug 2021 07:39:00 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1628685540; bh=oik4GnEIkEmZ9D1i+/AJF0jdOo3E9UKHSjJq6+bgAgM=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=ZJPobtay5fhr+ZYnYFm9KZkOOuQmpMCZfgUJq8Y7h27IS1DdSFBsTc37u93btEr+Z 4Y/j8JIvAYtx5EqbUaqMlBB+Pb5YMNE6xCP33+c1zzaa7cTGdJfwkmq3iJvkAnlCpk xWW3Wsl/KSsesEks9LUXhqpMWFwpAllvWraF0SG8= Received: from DFLE101.ent.ti.com (dfle101.ent.ti.com [10.64.6.22]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 17BCd0gQ018463 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 11 Aug 2021 07:39:00 -0500 Received: from DFLE101.ent.ti.com (10.64.6.22) by DFLE101.ent.ti.com (10.64.6.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Wed, 11 Aug 2021 07:38:59 -0500 Received: from lelv0327.itg.ti.com (10.180.67.183) by DFLE101.ent.ti.com (10.64.6.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Wed, 11 Aug 2021 07:38:59 -0500 Received: from a0393678-ssd.dal.design.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 17BCckL1053470; Wed, 11 Aug 2021 07:38:56 -0500 From: Kishon Vijay Abraham I To: Lorenzo Pieralisi , Marc Zyngier , Rob Herring , Bjorn Helgaas CC: Lokesh Vutla , , , , , Subject: [PATCH 2/2] PCI: j721e: Add PCI legacy interrupt support for J7200 Date: Wed, 11 Aug 2021 18:08:46 +0530 Message-ID: <20210811123846.31921-3-kishon@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210811123846.31921-1-kishon@ti.com> References: <20210811123846.31921-1-kishon@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org Add PCI legacy interrupt support for J7200. J7200 has a single HW interrupt line for all the four legacy interrupts INTA/INTB/INTC/INTD. The HW interrupt line connected to GIC is a pulse interrupt whereas the legacy interrupts by definition is level interrupt. In order to provide level interrupt functionality to edge interrupt line, PCIe in J7200 has provided USER_EOI_REG register. When the SW writes to USER_EOI_REG register after handling the interrupt, the IP checks the state of legacy interrupt and re-triggers pulse interrupt invoking the handler again. Due to Errata ID #i2094 ([1]), EOI feature is not enabled in J721E and only a single pulse interrupt will be generated for every ASSERT_INTx/DEASSERT_INTx. Hence legacy interrupt is not enabled in J721E. [1] -> J721E DRA829/TDA4VM Processors Silicon Revision 1.1/1.0 SPRZ455A – DECEMBER 2020 – REVISED AUGUST 2021 (https://www.ti.com/lit/er/sprz455a/sprz455a.pdf) Signed-off-by: Kishon Vijay Abraham I --- drivers/pci/controller/cadence/pci-j721e.c | 119 +++++++++++++++++++++ 1 file changed, 119 insertions(+) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index ffb176d288cd..4e786d6b89e0 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -29,12 +29,24 @@ #define LINK_DOWN BIT(1) #define J7200_LINK_DOWN BIT(10) +#define ENABLE_REG_SYS_1 0x104 +#define STATUS_REG_SYS_1 0x504 +#define SYS1_INTx_EN(num) (1 << (22 + (num))) + #define J721E_PCIE_USER_CMD_STATUS 0x4 #define LINK_TRAINING_ENABLE BIT(0) #define J721E_PCIE_USER_LINKSTATUS 0x14 #define LINK_STATUS GENMASK(1, 0) +#define USER_EOI_REG 0xC8 +enum eoi_reg { + EOI_DOWNSTREAM_INTERRUPT, + EOI_FLR_INTERRUPT, + EOI_LEGACY_INTERRUPT, + EOI_POWER_STATE_INTERRUPT, +}; + enum link_status { NO_RECEIVERS_DETECTED, LINK_TRAINING_IN_PROGRESS, @@ -59,6 +71,7 @@ struct j721e_pcie { void __iomem *user_cfg_base; void __iomem *intd_cfg_base; u32 linkdown_irq_regfield; + struct irq_domain *legacy_irq_domain; }; enum j721e_pcie_mode { @@ -121,6 +134,108 @@ static void j721e_pcie_config_link_irq(struct j721e_pcie *pcie) j721e_pcie_intd_writel(pcie, ENABLE_REG_SYS_2, reg); } +static void j721e_pcie_legacy_irq_handler(struct irq_desc *desc) +{ + struct j721e_pcie *pcie = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + int i, virq; + u32 reg; + + chained_irq_enter(chip, desc); + + reg = j721e_pcie_intd_readl(pcie, STATUS_REG_SYS_1); + for (i = 0; i < PCI_NUM_INTX; i++) { + if (!(reg & SYS1_INTx_EN(i))) + continue; + + virq = irq_find_mapping(pcie->legacy_irq_domain, i); + generic_handle_irq(virq); + } + + chained_irq_exit(chip, desc); +} + +static void j721e_pcie_irq_eoi(struct irq_data *data) +{ + struct j721e_pcie *pcie = irq_data_get_irq_chip_data(data); + + j721e_pcie_user_writel(pcie, USER_EOI_REG, EOI_LEGACY_INTERRUPT); +} + +static void j721e_pcie_irq_enable(struct irq_data *data) +{ + struct j721e_pcie *pcie = irq_data_get_irq_chip_data(data); + u32 reg; + + reg = j721e_pcie_intd_readl(pcie, ENABLE_REG_SYS_1); + reg |= SYS1_INTx_EN(irqd_to_hwirq(data)); + j721e_pcie_intd_writel(pcie, ENABLE_REG_SYS_1, reg); +} + +static void j721e_pcie_irq_disable(struct irq_data *data) +{ + struct j721e_pcie *pcie = irq_data_get_irq_chip_data(data); + u32 reg; + + reg = j721e_pcie_intd_readl(pcie, ENABLE_REG_SYS_1); + reg &= ~SYS1_INTx_EN(irqd_to_hwirq(data)); + j721e_pcie_intd_writel(pcie, ENABLE_REG_SYS_1, reg); +} + +struct irq_chip j721e_pcie_irq_chip = { + .name = "J721E-PCIE-INTX", + .irq_eoi = j721e_pcie_irq_eoi, + .irq_enable = j721e_pcie_irq_enable, + .irq_disable = j721e_pcie_irq_disable, +}; + +static int j721e_pcie_intx_map(struct irq_domain *domain, unsigned int irq, irq_hw_number_t hwirq) +{ + struct j721e_pcie *pcie = domain->host_data; + + irq_set_chip_and_handler(irq, &j721e_pcie_irq_chip, handle_fasteoi_irq); + irq_set_chip_data(irq, pcie); + + return 0; +} + +static const struct irq_domain_ops j721e_pcie_intx_domain_ops = { + .map = j721e_pcie_intx_map, +}; + +static int j721e_pcie_config_legacy_irq(struct j721e_pcie *pcie) +{ + struct irq_domain *legacy_irq_domain; + struct device *dev = pcie->dev; + struct device_node *node = dev->of_node; + struct device_node *intc_node; + int irq; + + intc_node = of_get_child_by_name(node, "interrupt-controller"); + if (!intc_node) { + dev_dbg(dev, "interrupt-controller node is absent. Legacy INTR not supported\n"); + return 0; + } + + irq = irq_of_parse_and_map(intc_node, 0); + if (!irq) { + dev_err(dev, "Failed to parse and map legacy irq\n"); + return -EINVAL; + } + + irq_set_chained_handler_and_data(irq, j721e_pcie_legacy_irq_handler, pcie); + + legacy_irq_domain = irq_domain_add_linear(intc_node, PCI_NUM_INTX, + &j721e_pcie_intx_domain_ops, pcie); + if (!legacy_irq_domain) { + dev_err(dev, "Failed to add irq domain for legacy irqs\n"); + return -EINVAL; + } + pcie->legacy_irq_domain = legacy_irq_domain; + + return 0; +} + static int j721e_pcie_start_link(struct cdns_pcie *cdns_pcie) { struct j721e_pcie *pcie = dev_get_drvdata(cdns_pcie->dev); @@ -433,6 +548,10 @@ static int j721e_pcie_probe(struct platform_device *pdev) goto err_get_sync; } + ret = j721e_pcie_config_legacy_irq(pcie); + if (ret < 0) + goto err_get_sync; + bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc)); if (!bridge) { ret = -ENOMEM;