From patchwork Wed Oct 28 01:31:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kunihiko Hayashi X-Patchwork-Id: 11863421 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C1D4492C for ; Wed, 28 Oct 2020 21:59:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AA49E24754 for ; Wed, 28 Oct 2020 21:59:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728746AbgJ1V7q (ORCPT ); Wed, 28 Oct 2020 17:59:46 -0400 Received: from mx.socionext.com ([202.248.49.38]:49811 "EHLO mx.socionext.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729293AbgJ1V7o (ORCPT ); Wed, 28 Oct 2020 17:59:44 -0400 Received: from unknown (HELO iyokan-ex.css.socionext.com) ([172.31.9.54]) by mx.socionext.com with ESMTP; 28 Oct 2020 10:31:57 +0900 Received: from mail.mfilter.local (m-filter-2 [10.213.24.62]) by iyokan-ex.css.socionext.com (Postfix) with ESMTP id 0FDDA60058; Wed, 28 Oct 2020 10:31:57 +0900 (JST) Received: from 172.31.9.51 (172.31.9.51) by m-FILTER with ESMTP; Wed, 28 Oct 2020 10:31:56 +0900 Received: from plum.e01.socionext.com (unknown [10.213.132.32]) by kinkan.css.socionext.com (Postfix) with ESMTP id 5EDFA1A0509; Wed, 28 Oct 2020 10:31:56 +0900 (JST) From: Kunihiko Hayashi To: Bjorn Helgaas , Rob Herring , Lorenzo Pieralisi , Jingoo Han , Gustavo Pimentel , Marc Zyngier Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Masami Hiramatsu , Jassi Brar , Kunihiko Hayashi Subject: [PATCH v8 3/3] PCI: uniphier: Add misc interrupt handler to invoke PME and AER Date: Wed, 28 Oct 2020 10:31:43 +0900 Message-Id: <1603848703-21099-4-git-send-email-hayashi.kunihiko@socionext.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1603848703-21099-1-git-send-email-hayashi.kunihiko@socionext.com> References: <1603848703-21099-1-git-send-email-hayashi.kunihiko@socionext.com> Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This patch adds misc interrupt handler to detect and invoke PME/AER event. In UniPhier PCIe controller, PME/AER signals are assigned to the same signal as MSI by the internal logic. These signals should be detected by the internal register, however, DWC MSI handler can't handle these signals. DWC MSI handler calls .msi_host_isr() callback function, that detects PME/AER signals with the internal register and invokes the interrupt with PME/AER vIRQ numbers. These vIRQ numbers is obtained from portdrv in uniphier_add_pcie_port() function. Cc: Marc Zyngier Cc: Jingoo Han Cc: Gustavo Pimentel Cc: Lorenzo Pieralisi Signed-off-by: Kunihiko Hayashi Reviewed-by: Rob Herring --- drivers/pci/controller/dwc/pcie-uniphier.c | 77 +++++++++++++++++++++++++----- 1 file changed, 66 insertions(+), 11 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c index 4817626..237537a 100644 --- a/drivers/pci/controller/dwc/pcie-uniphier.c +++ b/drivers/pci/controller/dwc/pcie-uniphier.c @@ -21,6 +21,7 @@ #include #include "pcie-designware.h" +#include "../../pcie/portdrv.h" #define PCL_PINCTRL0 0x002c #define PCL_PERST_PLDN_REGEN BIT(12) @@ -44,7 +45,9 @@ #define PCL_SYS_AUX_PWR_DET BIT(8) #define PCL_RCV_INT 0x8108 +#define PCL_RCV_INT_ALL_INT_MASK GENMASK(28, 25) #define PCL_RCV_INT_ALL_ENABLE GENMASK(20, 17) +#define PCL_RCV_INT_ALL_MSI_MASK GENMASK(12, 9) #define PCL_CFG_BW_MGT_STATUS BIT(4) #define PCL_CFG_LINK_AUTO_BW_STATUS BIT(3) #define PCL_CFG_AER_RC_ERR_MSI_STATUS BIT(2) @@ -68,6 +71,8 @@ struct uniphier_pcie_priv { struct reset_control *rst; struct phy *phy; struct irq_domain *legacy_irq_domain; + int aer_irq; + int pme_irq; }; #define to_uniphier_pcie(x) dev_get_drvdata((x)->dev) @@ -167,7 +172,15 @@ static void uniphier_pcie_stop_link(struct dw_pcie *pci) static void uniphier_pcie_irq_enable(struct uniphier_pcie_priv *priv) { - writel(PCL_RCV_INT_ALL_ENABLE, priv->base + PCL_RCV_INT); + u32 val; + + val = PCL_RCV_INT_ALL_ENABLE; + if (pci_msi_enabled()) + val |= PCL_RCV_INT_ALL_INT_MASK; + else + val |= PCL_RCV_INT_ALL_MSI_MASK; + + writel(val, priv->base + PCL_RCV_INT); writel(PCL_RCV_INTX_ALL_ENABLE, priv->base + PCL_RCV_INTX); } @@ -231,28 +244,52 @@ static const struct irq_domain_ops uniphier_intx_domain_ops = { .map = uniphier_pcie_intx_map, }; -static void uniphier_pcie_irq_handler(struct irq_desc *desc) +static void uniphier_pcie_misc_isr(struct pcie_port *pp, bool is_msi) { - struct pcie_port *pp = irq_desc_get_handler_data(desc); struct dw_pcie *pci = to_dw_pcie_from_pp(pp); struct uniphier_pcie_priv *priv = to_uniphier_pcie(pci); - struct irq_chip *chip = irq_desc_get_chip(desc); - unsigned long reg; - u32 val, bit, virq; + u32 val; - /* INT for debug */ val = readl(priv->base + PCL_RCV_INT); if (val & PCL_CFG_BW_MGT_STATUS) dev_dbg(pci->dev, "Link Bandwidth Management Event\n"); + if (val & PCL_CFG_LINK_AUTO_BW_STATUS) dev_dbg(pci->dev, "Link Autonomous Bandwidth Event\n"); - if (val & PCL_CFG_AER_RC_ERR_MSI_STATUS) - dev_dbg(pci->dev, "Root Error\n"); - if (val & PCL_CFG_PME_MSI_STATUS) - dev_dbg(pci->dev, "PME Interrupt\n"); + + if (is_msi) { + if (val & PCL_CFG_AER_RC_ERR_MSI_STATUS) { + dev_dbg(pci->dev, "Root Error Status\n"); + if (priv->aer_irq) + generic_handle_irq(priv->aer_irq); + } + + if (val & PCL_CFG_PME_MSI_STATUS) { + dev_dbg(pci->dev, "PME Interrupt\n"); + if (priv->pme_irq) + generic_handle_irq(priv->pme_irq); + } + } writel(val, priv->base + PCL_RCV_INT); +} + +static void uniphier_pcie_msi_host_isr(struct pcie_port *pp) +{ + uniphier_pcie_misc_isr(pp, true); +} + +static void uniphier_pcie_irq_handler(struct irq_desc *desc) +{ + struct pcie_port *pp = irq_desc_get_handler_data(desc); + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct uniphier_pcie_priv *priv = to_uniphier_pcie(pci); + struct irq_chip *chip = irq_desc_get_chip(desc); + unsigned long reg; + u32 val, bit, virq; + + uniphier_pcie_misc_isr(pp, false); /* INTx */ chained_irq_enter(chip, desc); @@ -329,6 +366,7 @@ static int uniphier_pcie_host_init(struct pcie_port *pp) static const struct dw_pcie_host_ops uniphier_pcie_host_ops = { .host_init = uniphier_pcie_host_init, + .msi_host_isr = uniphier_pcie_msi_host_isr, }; static int uniphier_add_pcie_port(struct uniphier_pcie_priv *priv, @@ -337,6 +375,7 @@ static int uniphier_add_pcie_port(struct uniphier_pcie_priv *priv, struct dw_pcie *pci = &priv->pci; struct pcie_port *pp = &pci->pp; struct device *dev = &pdev->dev; + struct pci_dev *pcidev; int ret; pp->ops = &uniphier_pcie_host_ops; @@ -353,6 +392,22 @@ static int uniphier_add_pcie_port(struct uniphier_pcie_priv *priv, return ret; } + /* irq for PME */ + list_for_each_entry(pcidev, &pp->bridge->bus->devices, bus_list) { + priv->pme_irq = + pcie_port_service_get_irq(pcidev, PCIE_PORT_SERVICE_PME); + if (priv->pme_irq) + break; + } + + /* irq for AER */ + list_for_each_entry(pcidev, &pp->bridge->bus->devices, bus_list) { + priv->aer_irq = + pcie_port_service_get_irq(pcidev, PCIE_PORT_SERVICE_AER); + if (priv->aer_irq) + break; + } + return 0; }