// SPDX-License-Identifier: GPL-2.0-only /* * Driver for Socionext External Interrupt Unit (EXIU) * * Copyright (c) 2017-2019 Linaro, Ltd. <ard.biesheuvel@linaro.org> * * Based on irq-tegra.c: * Copyright (C) 2011 Google, Inc. * Copyright (C) 2010,2013, NVIDIA Corporation */ #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irq.h> #include <linux/irqchip.h> #include <linux/irqdomain.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/platform_device.h> #include <dt-bindings/interrupt-controller/arm-gic.h> #define NUM_IRQS 32 #define EIMASK 0x00 #define EISRCSEL 0x04 #define EIREQSTA 0x08 #define EIRAWREQSTA 0x0C #define EIREQCLR 0x10 #define EILVL 0x14 #define EIEDG 0x18 #define EISIR 0x1C struct exiu_irq_data { void __iomem *base; u32 spi_base; }; static void exiu_irq_eoi(struct irq_data *d) { struct exiu_irq_data *data = irq_data_get_irq_chip_data(d); writel(BIT(d->hwirq), data->base + EIREQCLR); irq_chip_eoi_parent(d); } static void exiu_irq_mask(struct irq_data *d) { struct exiu_irq_data *data = irq_data_get_irq_chip_data(d); u32 val; val = readl_relaxed(data->base + EIMASK) | BIT(d->hwirq); writel_relaxed(val, data->base + EIMASK); irq_chip_mask_parent(d); } static void exiu_irq_unmask(struct irq_data *d) { struct exiu_irq_data *data = irq_data_get_irq_chip_data(d); u32 val; val = readl_relaxed(data->base + EIMASK) & ~BIT(d->hwirq); writel_relaxed(val, data->base + EIMASK); irq_chip_unmask_parent(d); } static void exiu_irq_enable(struct irq_data *d) { struct exiu_irq_data *data = irq_data_get_irq_chip_data(d); u32 val; /* clear interrupts that were latched while disabled */ writel_relaxed(BIT(d->hwirq), data->base + EIREQCLR); val = readl_relaxed(data->base + EIMASK) & ~BIT(d->hwirq); writel_relaxed(val, data->base + EIMASK); irq_chip_enable_parent(d); } static int exiu_irq_set_type(struct irq_data *d, unsigned int type) { struct exiu_irq_data *data = irq_data_get_irq_chip_data(d); u32 val; val = readl_relaxed(data->base + EILVL); if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH) val |= BIT(d->hwirq); else val &= ~BIT(d->hwirq); writel_relaxed(val, data->base + EILVL); val = readl_relaxed(data->base + EIEDG); if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH) val &= ~BIT(d->hwirq); else val |= BIT(d->hwirq); writel_relaxed(val, data->base + EIEDG); writel_relaxed(BIT(d->hwirq), data->base + EIREQCLR); return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH); } static struct irq_chip exiu_irq_chip = { .name = "EXIU", .irq_eoi = exiu_irq_eoi, .irq_enable = exiu_irq_enable, .irq_mask = exiu_irq_mask, .irq_unmask = exiu_irq_unmask, .irq_set_type = exiu_irq_set_type, .irq_set_affinity = irq_chip_set_affinity_parent, .flags = IRQCHIP_SET_TYPE_MASKED | IRQCHIP_SKIP_SET_WAKE | IRQCHIP_EOI_THREADED | IRQCHIP_MASK_ON_SUSPEND, }; static int exiu_domain_translate(struct irq_domain *domain, struct irq_fwspec *fwspec, unsigned long *hwirq, unsigned int *type) { struct exiu_irq_data *info = domain->host_data; if (is_of_node(fwspec->fwnode)) { if (fwspec->param_count != 3) return -EINVAL; if (fwspec->param[0] != GIC_SPI) return -EINVAL; /* No PPI should point to this domain */ *hwirq = fwspec->param[1] - info->spi_base; *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; } else { if (fwspec->param_count != 2) return -EINVAL; *hwirq = fwspec->param[0]; *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; } return 0; } static int exiu_domain_alloc(struct irq_domain *dom, unsigned int virq, unsigned int nr_irqs, void *data) { struct irq_fwspec *fwspec = data; struct irq_fwspec parent_fwspec; struct exiu_irq_data *info = dom->host_data; irq_hw_number_t hwirq; parent_fwspec = *fwspec; if (is_of_node(dom->parent->fwnode)) { if (fwspec->param_count != 3) return -EINVAL; /* Not GIC compliant */ if (fwspec->param[0] != GIC_SPI) return -EINVAL; /* No PPI should point to this domain */ hwirq = fwspec->param[1] - info->spi_base; } else { hwirq = fwspec->param[0]; parent_fwspec.param[0] = hwirq + info->spi_base + 32; } WARN_ON(nr_irqs != 1); irq_domain_set_hwirq_and_chip(dom, virq, hwirq, &exiu_irq_chip, info); parent_fwspec.fwnode = dom->parent->fwnode; return irq_domain_alloc_irqs_parent(dom, virq, nr_irqs, &parent_fwspec); } static const struct irq_domain_ops exiu_domain_ops = { .translate = exiu_domain_translate, .alloc = exiu_domain_alloc, .free = irq_domain_free_irqs_common, }; static struct exiu_irq_data *exiu_init(const struct fwnode_handle *fwnode, struct resource *res) { struct exiu_irq_data *data; int err; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return ERR_PTR(-ENOMEM); if (fwnode_property_read_u32_array(fwnode, "socionext,spi-base", &data->spi_base, 1)) { err = -ENODEV; goto out_free; } data->base = ioremap(res->start, resource_size(res)); if (!data->base) { err = -ENODEV; goto out_free; } /* clear and mask all interrupts */ writel_relaxed(0xFFFFFFFF, data->base + EIREQCLR); writel_relaxed(0xFFFFFFFF, data->base + EIMASK); return data; out_free: kfree(data); return ERR_PTR(err); } static int __init exiu_dt_init(struct device_node *node, struct device_node *parent) { struct irq_domain *parent_domain, *domain; struct exiu_irq_data *data; struct resource res; if (!parent) { pr_err("%pOF: no parent, giving up\n", node); return -ENODEV; } parent_domain = irq_find_host(parent); if (!parent_domain) { pr_err("%pOF: unable to obtain parent domain\n", node); return -ENXIO; } if (of_address_to_resource(node, 0, &res)) { pr_err("%pOF: failed to parse memory resource\n", node); return -ENXIO; } data = exiu_init(of_node_to_fwnode(node), &res); if (IS_ERR(data)) return PTR_ERR(data); domain = irq_domain_add_hierarchy(parent_domain, 0, NUM_IRQS, node, &exiu_domain_ops, data); if (!domain) { pr_err("%pOF: failed to allocate domain\n", node); goto out_unmap; } pr_info("%pOF: %d interrupts forwarded to %pOF\n", node, NUM_IRQS, parent); return 0; out_unmap: iounmap(data->base); kfree(data); return -ENOMEM; } IRQCHIP_DECLARE(exiu, "socionext,synquacer-exiu", exiu_dt_init); #ifdef CONFIG_ACPI static int exiu_acpi_probe(struct platform_device *pdev) { struct irq_domain *domain; struct exiu_irq_data *data; struct resource *res; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "failed to parse memory resource\n"); return -ENXIO; } data = exiu_init(dev_fwnode(&pdev->dev), res); if (IS_ERR(data)) return PTR_ERR(data); domain = acpi_irq_create_hierarchy(0, NUM_IRQS, dev_fwnode(&pdev->dev), &exiu_domain_ops, data); if (!domain) { dev_err(&pdev->dev, "failed to create IRQ domain\n"); goto out_unmap; } dev_info(&pdev->dev, "%d interrupts forwarded\n", NUM_IRQS); return 0; out_unmap: iounmap(data->base); kfree(data); return -ENOMEM; } static const struct acpi_device_id exiu_acpi_ids[] = { { "SCX0008" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(acpi, exiu_acpi_ids); static struct platform_driver exiu_driver = { .driver = { .name = "exiu", .acpi_match_table = exiu_acpi_ids, }, .probe = exiu_acpi_probe, }; builtin_platform_driver(exiu_driver); #endif