diff options
Diffstat (limited to 'drivers/irqchip/irq-sni-exiu.c')
| -rw-r--r-- | drivers/irqchip/irq-sni-exiu.c | 147 |
1 files changed, 112 insertions, 35 deletions
diff --git a/drivers/irqchip/irq-sni-exiu.c b/drivers/irqchip/irq-sni-exiu.c index 1927b2f36ff6..1d027623c776 100644 --- a/drivers/irqchip/irq-sni-exiu.c +++ b/drivers/irqchip/irq-sni-exiu.c @@ -1,15 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Driver for Socionext External Interrupt Unit (EXIU) * - * Copyright (c) 2017 Linaro, Ltd. <ard.biesheuvel@linaro.org> + * 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 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/interrupt.h> @@ -20,6 +17,7 @@ #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> @@ -134,9 +132,13 @@ static int exiu_domain_translate(struct irq_domain *domain, *hwirq = fwspec->param[1] - info->spi_base; *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; - return 0; + } else { + if (fwspec->param_count != 2) + return -EINVAL; + *hwirq = fwspec->param[0]; + *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK; } - return -EINVAL; + return 0; } static int exiu_domain_alloc(struct irq_domain *dom, unsigned int virq, @@ -147,16 +149,21 @@ static int exiu_domain_alloc(struct irq_domain *dom, unsigned int virq, struct exiu_irq_data *info = dom->host_data; irq_hw_number_t hwirq; - 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 */ + 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); - hwirq = fwspec->param[1] - info->spi_base; irq_domain_set_hwirq_and_chip(dom, virq, hwirq, &exiu_irq_chip, info); - parent_fwspec = *fwspec; parent_fwspec.fwnode = dom->parent->fwnode; return irq_domain_alloc_irqs_parent(dom, virq, nr_irqs, &parent_fwspec); } @@ -167,35 +174,23 @@ static const struct irq_domain_ops exiu_domain_ops = { .free = irq_domain_free_irqs_common, }; -static int __init exiu_init(struct device_node *node, - struct device_node *parent) +static struct exiu_irq_data *exiu_init(const struct fwnode_handle *fwnode, + struct resource *res) { - struct irq_domain *parent_domain, *domain; struct exiu_irq_data *data; int err; - 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; - } - data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) - return -ENOMEM; + return ERR_PTR(-ENOMEM); - if (of_property_read_u32(node, "socionext,spi-base", &data->spi_base)) { - pr_err("%pOF: failed to parse 'spi-base' property\n", node); + if (fwnode_property_read_u32_array(fwnode, "socionext,spi-base", + &data->spi_base, 1)) { err = -ENODEV; goto out_free; } - data->base = of_iomap(node, 0); + data->base = ioremap(res->start, resource_size(res)); if (!data->base) { err = -ENODEV; goto out_free; @@ -205,11 +200,44 @@ static int __init exiu_init(struct device_node *node, 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); - err = -ENOMEM; goto out_unmap; } @@ -220,8 +248,57 @@ static int __init exiu_init(struct device_node *node, out_unmap: iounmap(data->base); -out_free: kfree(data); - return err; + 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; } -IRQCHIP_DECLARE(exiu, "socionext,synquacer-exiu", exiu_init); + +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 |