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Thu, 25 Mar 2021 04:00:52 -0500 Received: from DLEE103.ent.ti.com (157.170.170.33) by DLEE102.ent.ti.com (157.170.170.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Thu, 25 Mar 2021 04:00:52 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE103.ent.ti.com (157.170.170.33) 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; Thu, 25 Mar 2021 04:00:52 -0500 Received: from a0393678-ssd.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 12P90RkC115556; Thu, 25 Mar 2021 04:00:49 -0500 From: Kishon Vijay Abraham I To: Kishon Vijay Abraham I , Bjorn Helgaas , Rob Herring , Lorenzo Pieralisi , Marc Zyngier CC: , , , , Lokesh Vutla Subject: [PATCH 5/6] PCI: keystone: Add PCI legacy interrupt support for AM654 Date: Thu, 25 Mar 2021 14:30:25 +0530 Message-ID: <20210325090026.8843-6-kishon@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210325090026.8843-1-kishon@ti.com> References: <20210325090026.8843-1-kishon@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210325_090102_057953_FC68EF49 X-CRM114-Status: GOOD ( 20.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add PCI legacy interrupt support for AM654. AM654 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 AM654 has provided IRQ_EOI register. When the SW writes to IRQ_EOI register after handling the interrupt, the IP checks the state of legacy interrupt and re-triggers pulse interrupt invoking the handler again. Signed-off-by: Kishon Vijay Abraham I --- drivers/pci/controller/dwc/pci-keystone.c | 87 +++++++++++++++++++++-- 1 file changed, 82 insertions(+), 5 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c index dfa9a7fcf9b7..84a25207d0d3 100644 --- a/drivers/pci/controller/dwc/pci-keystone.c +++ b/drivers/pci/controller/dwc/pci-keystone.c @@ -118,6 +118,7 @@ struct keystone_pcie { /* PCI Device ID */ u32 device_id; struct device_node *legacy_intc_np; + struct irq_domain *legacy_irq_domain; int msi_host_irq; int num_lanes; @@ -289,6 +290,29 @@ static irqreturn_t ks_pcie_handle_error_irq(struct keystone_pcie *ks_pcie) return IRQ_HANDLED; } +static void ks_pcie_am654_legacy_irq_handler(struct irq_desc *desc) +{ + struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + int virq, i; + u32 reg; + + chained_irq_enter(chip, desc); + + for (i = 0; i < PCI_NUM_INTX; i++) { + reg = ks_pcie_app_readl(ks_pcie, IRQ_STATUS(i)); + if (!(reg & INTx_EN)) + continue; + + virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, i); + generic_handle_irq(virq); + ks_pcie_app_writel(ks_pcie, IRQ_STATUS(i), INTx_EN); + ks_pcie_app_writel(ks_pcie, IRQ_EOI, i); + } + + chained_irq_exit(chip, desc); +} + void ks_pcie_irq_eoi(struct irq_data *data) { struct keystone_pcie *ks_pcie = irq_data_get_irq_chip_data(data); @@ -728,6 +752,54 @@ static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie) return ret; } +static int ks_pcie_am654_intx_map(struct irq_domain *domain, unsigned int irq, + irq_hw_number_t hwirq) +{ + irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq); + irq_set_chip_data(irq, domain->host_data); + + return 0; +} + +static const struct irq_domain_ops ks_pcie_am654_irq_domain_ops = { + .map = ks_pcie_am654_intx_map, +}; + +static int ks_pcie_am654_config_legacy_irq(struct keystone_pcie *ks_pcie) +{ + struct device *dev = ks_pcie->pci->dev; + struct irq_domain *legacy_irq_domain; + struct device_node *np = ks_pcie->np; + struct device_node *intc_np; + int ret = 0; + int irq; + int i; + + intc_np = of_get_child_by_name(np, "interrupt-controller"); + if (!intc_np) { + dev_warn(dev, "legacy interrupt-controller node is absent\n"); + return -EINVAL; + } + + irq = irq_of_parse_and_map(intc_np, 0); + if (!irq) + return -EINVAL; + + irq_set_chained_handler_and_data(irq, ks_pcie_am654_legacy_irq_handler, ks_pcie); + legacy_irq_domain = irq_domain_add_linear(intc_np, PCI_NUM_INTX, + &ks_pcie_am654_irq_domain_ops, ks_pcie); + if (!legacy_irq_domain) { + dev_err(dev, "Failed to add irq domain for legacy irqs\n"); + return -EINVAL; + } + ks_pcie->legacy_irq_domain = legacy_irq_domain; + + for (i = 0; i < PCI_NUM_INTX; i++) + ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_SET(i), INTx_EN); + + return ret; +} + static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie) { struct device *dev = ks_pcie->pci->dev; @@ -835,12 +907,17 @@ static int __init ks_pcie_host_init(struct pcie_port *pp) int ret; pp->bridge->ops = &ks_pcie_ops; - if (!ks_pcie->is_am6) - pp->bridge->child_ops = &ks_child_pcie_ops; - ret = ks_pcie_config_legacy_irq(ks_pcie); - if (ret) - return ret; + if (!ks_pcie->is_am6) { + pp->bridge->child_ops = &ks_child_pcie_ops; + ret = ks_pcie_config_legacy_irq(ks_pcie); + if (ret) + return ret; + } else { + ret = ks_pcie_am654_config_legacy_irq(ks_pcie); + if (ret) + return ret; + } ret = ks_pcie_config_msi_irq(ks_pcie); if (ret)