From patchwork Fri Aug 9 20:27:11 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Petazzoni X-Patchwork-Id: 2842131 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 5D205BF546 for ; Fri, 9 Aug 2013 20:27:44 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4B6E42038B for ; Fri, 9 Aug 2013 20:27:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 25E0E2037D for ; Fri, 9 Aug 2013 20:27:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031056Ab3HIU1l (ORCPT ); Fri, 9 Aug 2013 16:27:41 -0400 Received: from top.free-electrons.com ([176.31.233.9]:46459 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1031006Ab3HIU1k (ORCPT ); Fri, 9 Aug 2013 16:27:40 -0400 Received: by mail.free-electrons.com (Postfix, from userid 106) id 08AF56CEC; Fri, 9 Aug 2013 22:27:49 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-5.1 required=5.0 tests=BAYES_00,KHOP_BIG_TO_CC, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from localhost (unknown [37.161.232.130]) by mail.free-electrons.com (Postfix) with ESMTPSA id DDC076555; Fri, 9 Aug 2013 22:27:48 +0200 (CEST) From: Thomas Petazzoni To: Bjorn Helgaas , linux-pci@vger.kernel.org, Russell King , Benjamin Herrenschmidt , Rob Herring , Thomas Gleixner , Jason Cooper , Andrew Lunn , Gregory Clement Cc: Ezequiel Garcia , linux-arm-kernel@lists.infradead.org, Maen Suleiman , Lior Amsalem , Thierry Reding Subject: [PATCHv9 06/10] irqchip: armada-370-xp: implement MSI support Date: Fri, 9 Aug 2013 22:27:11 +0200 Message-Id: <1376080035-29344-7-git-send-email-thomas.petazzoni@free-electrons.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1376080035-29344-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1376080035-29344-1-git-send-email-thomas.petazzoni@free-electrons.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This commit introduces the support for the MSI interrupts in the armada-370-xp interrupt controller driver. It registers an MSI chip to the MSI chip registry, which will be used by the Marvell PCIe host controller driver. The MSI interrupts use the 16 high doorbells, and are therefore notified using IRQ1 of the main interrupt controller. Signed-off-by: Thomas Petazzoni Acked-by: Gregory CLEMENT --- .../devicetree/bindings/arm/armada-370-xp-mpic.txt | 3 + drivers/irqchip/irq-armada-370-xp.c | 182 ++++++++++++++++++++- 2 files changed, 184 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/arm/armada-370-xp-mpic.txt b/Documentation/devicetree/bindings/arm/armada-370-xp-mpic.txt index 61df564..d74091a 100644 --- a/Documentation/devicetree/bindings/arm/armada-370-xp-mpic.txt +++ b/Documentation/devicetree/bindings/arm/armada-370-xp-mpic.txt @@ -4,6 +4,8 @@ Marvell Armada 370 and Armada XP Interrupt Controller Required properties: - compatible: Should be "marvell,mpic" - interrupt-controller: Identifies the node as an interrupt controller. +- msi-controller: Identifies the node as an PCI Message Signaled + Interrupt controller. - #interrupt-cells: The number of cells to define the interrupts. Should be 1. The cell is the IRQ number @@ -24,6 +26,7 @@ Example: #address-cells = <1>; #size-cells = <1>; interrupt-controller; + msi-controller; reg = <0xd0020a00 0x1d0>, <0xd0021070 0x58>; }; diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c index 26adc74..433cc85 100644 --- a/drivers/irqchip/irq-armada-370-xp.c +++ b/drivers/irqchip/irq-armada-370-xp.c @@ -21,7 +21,10 @@ #include #include #include +#include #include +#include +#include #include #include #include @@ -51,12 +54,22 @@ #define IPI_DOORBELL_START (0) #define IPI_DOORBELL_END (8) #define IPI_DOORBELL_MASK 0xFF +#define PCI_MSI_DOORBELL_START (16) +#define PCI_MSI_DOORBELL_NR (16) +#define PCI_MSI_DOORBELL_END (32) +#define PCI_MSI_DOORBELL_MASK 0xFFFF0000 static DEFINE_RAW_SPINLOCK(irq_controller_lock); static void __iomem *per_cpu_int_base; static void __iomem *main_int_base; static struct irq_domain *armada_370_xp_mpic_domain; +#ifdef CONFIG_PCI_MSI +static struct irq_domain *armada_370_xp_msi_domain; +static DECLARE_BITMAP(msi_used, PCI_MSI_DOORBELL_NR); +static DEFINE_MUTEX(msi_used_lock); +static phys_addr_t msi_doorbell_addr; +#endif /* * In SMP mode: @@ -87,6 +100,144 @@ static void armada_370_xp_irq_unmask(struct irq_data *d) ARMADA_370_XP_INT_CLEAR_MASK_OFFS); } +#ifdef CONFIG_PCI_MSI + +static int armada_370_xp_alloc_msi(void) +{ + int hwirq; + + mutex_lock(&msi_used_lock); + hwirq = find_first_zero_bit(&msi_used, PCI_MSI_DOORBELL_NR); + if (hwirq >= PCI_MSI_DOORBELL_NR) + hwirq = -ENOSPC; + else + set_bit(hwirq, msi_used); + mutex_unlock(&msi_used_lock); + + return hwirq; +} + +static void armada_370_xp_free_msi(int hwirq) +{ + mutex_lock(&msi_used_lock); + if (!test_bit(hwirq, msi_used)) + pr_err("trying to free unused MSI#%d\n", hwirq); + else + clear_bit(hwirq, msi_used); + mutex_unlock(&msi_used_lock); +} + +static int armada_370_xp_setup_msi_irq(struct msi_chip *chip, + struct pci_dev *pdev, + struct msi_desc *desc) +{ + struct msi_msg msg; + irq_hw_number_t hwirq; + int virq; + + hwirq = armada_370_xp_alloc_msi(); + if (hwirq < 0) + return hwirq; + + virq = irq_create_mapping(armada_370_xp_msi_domain, hwirq); + if (!virq) { + armada_370_xp_free_msi(hwirq); + return -EINVAL; + } + + irq_set_msi_desc(virq, desc); + + msg.address_lo = msi_doorbell_addr; + msg.address_hi = 0; + msg.data = 0xf00 | (hwirq + 16); + + write_msi_msg(virq, &msg); + return 0; +} + +static void armada_370_xp_teardown_msi_irq(struct msi_chip *chip, + unsigned int irq) +{ + struct irq_data *d = irq_get_irq_data(irq); + irq_dispose_mapping(irq); + armada_370_xp_free_msi(d->hwirq); +} + +static struct irq_chip armada_370_xp_msi_irq_chip = { + .name = "armada_370_xp_msi_irq", + .irq_enable = unmask_msi_irq, + .irq_disable = mask_msi_irq, + .irq_mask = mask_msi_irq, + .irq_unmask = unmask_msi_irq, +}; + +static int armada_370_xp_msi_map(struct irq_domain *domain, unsigned int virq, + irq_hw_number_t hw) +{ + irq_set_chip_and_handler(virq, &armada_370_xp_msi_irq_chip, + handle_simple_irq); + set_irq_flags(virq, IRQF_VALID); + + return 0; +} + +static const struct irq_domain_ops armada_370_xp_msi_irq_ops = { + .map = armada_370_xp_msi_map, +}; + +static int armada_370_xp_msi_init(struct device_node *node, + phys_addr_t main_int_phys_base) +{ + struct msi_chip *msi_chip; + u32 reg; + int ret; + + msi_doorbell_addr = main_int_phys_base + + ARMADA_370_XP_SW_TRIG_INT_OFFS; + + msi_chip = kzalloc(sizeof(*msi_chip), GFP_KERNEL); + if (!msi_chip) + return -ENOMEM; + + msi_chip->setup_irq = armada_370_xp_setup_msi_irq; + msi_chip->teardown_irq = armada_370_xp_teardown_msi_irq; + msi_chip->of_node = node; + + armada_370_xp_msi_domain = + irq_domain_add_linear(NULL, PCI_MSI_DOORBELL_NR, + &armada_370_xp_msi_irq_ops, + NULL); + if (!armada_370_xp_msi_domain) { + kfree(msi_chip); + return -ENOMEM; + } + + ret = of_pci_msi_chip_add(msi_chip); + if (ret < 0) { + irq_domain_remove(armada_370_xp_msi_domain); + kfree(msi_chip); + return ret; + } + + reg = readl(per_cpu_int_base + ARMADA_370_XP_IN_DRBEL_MSK_OFFS) + | PCI_MSI_DOORBELL_MASK; + + writel(reg, per_cpu_int_base + + ARMADA_370_XP_IN_DRBEL_MSK_OFFS); + + /* Unmask IPI interrupt */ + writel(1, per_cpu_int_base + ARMADA_370_XP_INT_CLEAR_MASK_OFFS); + + return 0; +} +#else +static inline int armada_370_xp_msi_init(struct device_node *node, + phys_addr_t main_int_phys_base) +{ + return 0; +} +#endif + #ifdef CONFIG_SMP static int armada_xp_set_affinity(struct irq_data *d, const struct cpumask *mask_val, bool force) @@ -214,12 +365,39 @@ armada_370_xp_handle_irq(struct pt_regs *regs) if (irqnr > 1022) break; - if (irqnr > 0) { + if (irqnr > 1) { irqnr = irq_find_mapping(armada_370_xp_mpic_domain, irqnr); handle_IRQ(irqnr, regs); continue; } + +#ifdef CONFIG_PCI_MSI + /* MSI handling */ + if (irqnr == 1) { + u32 msimask, msinr; + + msimask = readl_relaxed(per_cpu_int_base + + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS) + & PCI_MSI_DOORBELL_MASK; + + writel(~PCI_MSI_DOORBELL_MASK, per_cpu_int_base + + ARMADA_370_XP_IN_DRBEL_CAUSE_OFFS); + + for (msinr = PCI_MSI_DOORBELL_START; + msinr < PCI_MSI_DOORBELL_END; msinr++) { + int irq; + + if (!(msimask & BIT(msinr))) + continue; + + irq = irq_find_mapping(armada_370_xp_msi_domain, + msinr - 16); + handle_IRQ(irq, regs); + } + } +#endif + #ifdef CONFIG_SMP /* IPI Handling */ if (irqnr == 0) { @@ -292,6 +470,8 @@ static int __init armada_370_xp_mpic_of_init(struct device_node *node, #endif + armada_370_xp_msi_init(node, main_int_res.start); + set_handle_irq(armada_370_xp_handle_irq); return 0;