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