From patchwork Thu Mar 26 06:48:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Srinath Mannam X-Patchwork-Id: 1261822 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=broadcom.com header.i=@broadcom.com header.a=rsa-sha256 header.s=google header.b=NXMrBUAF; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48nwZc3CV9z9sSL for ; Thu, 26 Mar 2020 17:49:28 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727725AbgCZGt1 (ORCPT ); Thu, 26 Mar 2020 02:49:27 -0400 Received: from mail-wr1-f65.google.com ([209.85.221.65]:33865 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727752AbgCZGt1 (ORCPT ); Thu, 26 Mar 2020 02:49:27 -0400 Received: by mail-wr1-f65.google.com with SMTP id 65so6399507wrl.1 for ; Wed, 25 Mar 2020 23:49:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=fh/TLNefQmL1SjuEsz52lTohOhcfunUSRzYwviSzm/Y=; b=NXMrBUAF2/syHgv1mCPuwpGVTtKZMJfoDeayagoJ4OiDq+ycNTphmqXDZNryHWDKzL MiKDQYxc23B3Ivzm7qW990+m8vIMAkRa+8KPtlqQyAyj8Jkw4gsuzNytrgohAxFJf7KN 4smiFzsPh1N+otMLKkRsPXpH7fV3LkHw5Vi1U= 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; bh=fh/TLNefQmL1SjuEsz52lTohOhcfunUSRzYwviSzm/Y=; b=GrmqWHm37g4LopkkMG90UALXrNKNoghkzKoUzoF/fNrxbeGjmYMNsz5y5JHKXm3lpQ 0PQ0bqhSmTRqR4YncyG8N3vUf+jipNYK0VLE1+3fAiul+nQX7nrMMrW+lrKJhULwGbId vykBi6vXQForysVRq6IETiwlb4b5MMOnOfSQQVJ4nraDeBwc0LKh15CWNvhvzrOfSiE0 NqEp/b8Mm5mmId08WfGZf+Sfktct8zDJ0TbJIkog0TBDnqzd6hwlBwGgnscVQHaLn/4l c1eQ31b+JASNdRS7Lolgow0JBXUFRP4rf3oy29TzBfX2vSX6pyDJDtPKY0IM5+OTTomJ K1vQ== X-Gm-Message-State: ANhLgQ0rb5CrCQkkC8A3PkhxryFmeM6r9SdAN7na29lGG8btmm8SYekd 0c2Fqu914Lb7irM+UIkzzMMjtA== X-Google-Smtp-Source: ADFU+vvQ3rK47wJ0+nIAYV8ZUHsndQ8ahJHsCpAmdfrH86NngQd44OZSVGpJqx7/ULYofCL2OrXueg== X-Received: by 2002:adf:e611:: with SMTP id p17mr7444925wrm.212.1585205365864; Wed, 25 Mar 2020 23:49:25 -0700 (PDT) Received: from mannams-OptiPlex-7010.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id v21sm2069137wmj.8.2020.03.25.23.49.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 25 Mar 2020 23:49:25 -0700 (PDT) From: Srinath Mannam To: Lorenzo Pieralisi , Bjorn Helgaas , Florian Fainelli , Ray Jui , Rob Herring , Andrew Murray , Mark Rutland , Andy Shevchenko , Arnd Bergmann Cc: bcm-kernel-feedback-list@broadcom.com, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Ray Jui , Srinath Mannam Subject: [PATCH v5 2/6] PCI: iproc: Add INTx support with better modeling Date: Thu, 26 Mar 2020 12:18:42 +0530 Message-Id: <1585205326-25326-3-git-send-email-srinath.mannam@broadcom.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1585205326-25326-1-git-send-email-srinath.mannam@broadcom.com> References: <1585205326-25326-1-git-send-email-srinath.mannam@broadcom.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Ray Jui Add PCIe legacy interrupt INTx support to the iProc PCIe driver by modeling it with its own IRQ domain. All 4 interrupts INTA, INTB, INTC, INTD share the same interrupt line connected to the GIC in the system, while the status of each INTx can be obtained through the INTX CSR register. Signed-off-by: Ray Jui Signed-off-by: Srinath Mannam Reviewed-by: Andrew Murray --- drivers/pci/controller/pcie-iproc.c | 147 +++++++++++++++++++++++++++++++++++- drivers/pci/controller/pcie-iproc.h | 8 ++ 2 files changed, 153 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c index 0a468c7..62d8f43 100644 --- a/drivers/pci/controller/pcie-iproc.c +++ b/drivers/pci/controller/pcie-iproc.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -270,6 +271,7 @@ enum iproc_pcie_reg { /* enable INTx */ IPROC_PCIE_INTX_EN, + IPROC_PCIE_INTX_CSR, /* outbound address mapping */ IPROC_PCIE_OARR0, @@ -314,6 +316,7 @@ static const u16 iproc_pcie_reg_paxb_bcma[] = { [IPROC_PCIE_CFG_ADDR] = 0x1f8, [IPROC_PCIE_CFG_DATA] = 0x1fc, [IPROC_PCIE_INTX_EN] = 0x330, + [IPROC_PCIE_INTX_CSR] = 0x334, [IPROC_PCIE_LINK_STATUS] = 0xf0c, }; @@ -325,6 +328,7 @@ static const u16 iproc_pcie_reg_paxb[] = { [IPROC_PCIE_CFG_ADDR] = 0x1f8, [IPROC_PCIE_CFG_DATA] = 0x1fc, [IPROC_PCIE_INTX_EN] = 0x330, + [IPROC_PCIE_INTX_CSR] = 0x334, [IPROC_PCIE_OARR0] = 0xd20, [IPROC_PCIE_OMAP0] = 0xd40, [IPROC_PCIE_OARR1] = 0xd28, @@ -341,6 +345,7 @@ static const u16 iproc_pcie_reg_paxb_v2[] = { [IPROC_PCIE_CFG_ADDR] = 0x1f8, [IPROC_PCIE_CFG_DATA] = 0x1fc, [IPROC_PCIE_INTX_EN] = 0x330, + [IPROC_PCIE_INTX_CSR] = 0x334, [IPROC_PCIE_OARR0] = 0xd20, [IPROC_PCIE_OMAP0] = 0xd40, [IPROC_PCIE_OARR1] = 0xd28, @@ -846,9 +851,142 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie) return link_is_active ? 0 : -ENODEV; } -static void iproc_pcie_enable(struct iproc_pcie *pcie) +static void iproc_pcie_mask_irq(struct irq_data *d) { + struct iproc_pcie *pcie = irq_data_get_irq_chip_data(d); + u32 val; + unsigned long flags; + + spin_lock_irqsave(&pcie->intx_lock, flags); + val = iproc_pcie_read_reg(pcie, IPROC_PCIE_INTX_EN); + val &= ~(BIT(irqd_to_hwirq(d))); + iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, val); + spin_unlock_irqrestore(&pcie->intx_lock, flags); +} + +static void iproc_pcie_unmask_irq(struct irq_data *d) +{ + struct iproc_pcie *pcie = irq_data_get_irq_chip_data(d); + u32 val; + unsigned long flags; + + spin_lock_irqsave(&pcie->intx_lock, flags); + val = iproc_pcie_read_reg(pcie, IPROC_PCIE_INTX_EN); + val |= (BIT(irqd_to_hwirq(d))); + iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, val); + spin_unlock_irqrestore(&pcie->intx_lock, flags); +} + +static struct irq_chip iproc_pcie_irq_chip = { + .name = "pcie-iproc-intc", + .irq_enable = iproc_pcie_unmask_irq, + .irq_disable = iproc_pcie_mask_irq, + .irq_mask = iproc_pcie_mask_irq, + .irq_unmask = iproc_pcie_unmask_irq, +}; + +static int iproc_pcie_intx_map(struct irq_domain *domain, unsigned int irq, + irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &iproc_pcie_irq_chip, handle_level_irq); + irq_set_chip_data(irq, domain->host_data); + + return 0; +} + +static const struct irq_domain_ops intx_domain_ops = { + .map = iproc_pcie_intx_map, +}; + +static void iproc_pcie_isr(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct iproc_pcie *pcie; + struct device *dev; + unsigned long status; + u32 bit, virq; + + chained_irq_enter(chip, desc); + pcie = irq_desc_get_handler_data(desc); + dev = pcie->dev; + + /* go through INTx A, B, C, D until all interrupts are handled */ + do { + status = iproc_pcie_read_reg(pcie, IPROC_PCIE_INTX_CSR); + for_each_set_bit(bit, &status, PCI_NUM_INTX) { + virq = irq_find_mapping(pcie->irq_domain, bit); + if (virq) + generic_handle_irq(virq); + else + dev_err(dev, "unexpected INTx%u\n", bit); + } + } while ((status & SYS_RC_INTX_MASK) != 0); + + chained_irq_exit(chip, desc); +} + +static int iproc_pcie_intx_enable(struct iproc_pcie *pcie) +{ + struct device *dev = pcie->dev; + struct device_node *node; + int ret; + + /* + * BCMA devices do not map INTx the same way as platform devices. All + * BCMA needs below line to enable INTx + */ iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, SYS_RC_INTX_MASK); + + node = of_get_compatible_child(dev->of_node, "brcm,iproc-intc"); + if (node) + pcie->irq = of_irq_get(node, 0); + + if (!node || pcie->irq <= 0) + return 0; + + spin_lock_init(&pcie->intx_lock); + + /* set IRQ handler */ + irq_set_chained_handler_and_data(pcie->irq, iproc_pcie_isr, pcie); + + /* add IRQ domain for INTx */ + pcie->irq_domain = irq_domain_add_linear(node, PCI_NUM_INTX, + &intx_domain_ops, pcie); + if (!pcie->irq_domain) { + dev_err(dev, "failed to add INTx IRQ domain\n"); + ret = -ENOMEM; + goto err_rm_handler_data; + } + + return 0; + +err_rm_handler_data: + of_node_put(node); + irq_set_chained_handler_and_data(pcie->irq, NULL, NULL); + + return ret; +} + +static void iproc_pcie_intx_disable(struct iproc_pcie *pcie) +{ + uint32_t offset, virq; + unsigned long flags; + + spin_lock_irqsave(&pcie->intx_lock, flags); + iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, 0x0); + spin_unlock_irqrestore(&pcie->intx_lock, flags); + + if (pcie->irq <= 0) + return; + + for (offset = 0; offset < PCI_NUM_INTX; offset++) { + virq = irq_find_mapping(pcie->irq_domain, offset); + if (virq) + irq_dispose_mapping(virq); + } + + irq_domain_remove(pcie->irq_domain); + irq_set_chained_handler_and_data(pcie->irq, NULL, NULL); } static inline bool iproc_pcie_ob_is_valid(struct iproc_pcie *pcie, @@ -1518,7 +1656,11 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res) goto err_power_off_phy; } - iproc_pcie_enable(pcie); + ret = iproc_pcie_intx_enable(pcie); + if (ret) { + dev_err(dev, "failed to enable INTx\n"); + goto err_power_off_phy; + } if (IS_ENABLED(CONFIG_PCI_MSI)) if (iproc_pcie_msi_enable(pcie)) @@ -1562,6 +1704,7 @@ int iproc_pcie_remove(struct iproc_pcie *pcie) pci_remove_root_bus(pcie->root_bus); iproc_pcie_msi_disable(pcie); + iproc_pcie_intx_disable(pcie); phy_power_off(pcie->phy); phy_exit(pcie->phy); diff --git a/drivers/pci/controller/pcie-iproc.h b/drivers/pci/controller/pcie-iproc.h index 4f03ea5..787bfba 100644 --- a/drivers/pci/controller/pcie-iproc.h +++ b/drivers/pci/controller/pcie-iproc.h @@ -74,9 +74,13 @@ struct iproc_msi; * @ib: inbound mapping related parameters * @ib_map: outbound mapping region related parameters * + * @irq: interrupt line wired to the generic GIC for INTx + * @irq_domain: IRQ domain for INTx + * * @need_msi_steer: indicates additional configuration of the iProc PCIe * controller is required to steer MSI writes to external interrupt controller * @msi: MSI data + * @intx_lock: spinlock to protect access to INTx related registers */ struct iproc_pcie { struct device *dev; @@ -102,8 +106,12 @@ struct iproc_pcie { struct iproc_pcie_ib ib; const struct iproc_pcie_ib_map *ib_map; + int irq; + struct irq_domain *irq_domain; + bool need_msi_steer; struct iproc_msi *msi; + spinlock_t intx_lock; }; int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res);