123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for IDT/Renesas 79RC3243x Interrupt Controller.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqchip.h>
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#include <linux/irqchip/chained_irq.h>
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#include <linux/irqdomain.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#define IDT_PIC_NR_IRQS 32
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#define IDT_PIC_IRQ_PEND 0x00
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#define IDT_PIC_IRQ_MASK 0x08
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struct idt_pic_data {
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void __iomem *base;
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struct irq_domain *irq_domain;
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struct irq_chip_generic *gc;
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};
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static void idt_irq_dispatch(struct irq_desc *desc)
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{
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struct idt_pic_data *idtpic = irq_desc_get_handler_data(desc);
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struct irq_chip *host_chip = irq_desc_get_chip(desc);
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u32 pending, hwirq;
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chained_irq_enter(host_chip, desc);
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pending = irq_reg_readl(idtpic->gc, IDT_PIC_IRQ_PEND);
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pending &= ~idtpic->gc->mask_cache;
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while (pending) {
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hwirq = __fls(pending);
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generic_handle_domain_irq(idtpic->irq_domain, hwirq);
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pending &= ~(1 << hwirq);
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}
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chained_irq_exit(host_chip, desc);
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}
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static int idt_pic_init(struct device_node *of_node, struct device_node *parent)
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{
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struct irq_domain *domain;
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struct idt_pic_data *idtpic;
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struct irq_chip_generic *gc;
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struct irq_chip_type *ct;
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unsigned int parent_irq;
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int ret = 0;
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idtpic = kzalloc(sizeof(*idtpic), GFP_KERNEL);
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if (!idtpic) {
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ret = -ENOMEM;
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goto out_err;
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}
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parent_irq = irq_of_parse_and_map(of_node, 0);
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if (!parent_irq) {
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pr_err("Failed to map parent IRQ!\n");
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ret = -EINVAL;
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goto out_free;
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}
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idtpic->base = of_iomap(of_node, 0);
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if (!idtpic->base) {
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pr_err("Failed to map base address!\n");
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ret = -ENOMEM;
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goto out_unmap_irq;
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}
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domain = irq_domain_add_linear(of_node, IDT_PIC_NR_IRQS,
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&irq_generic_chip_ops, NULL);
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if (!domain) {
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pr_err("Failed to add irqdomain!\n");
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ret = -ENOMEM;
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goto out_iounmap;
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}
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idtpic->irq_domain = domain;
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ret = irq_alloc_domain_generic_chips(domain, 32, 1, "IDTPIC",
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handle_level_irq, 0,
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IRQ_NOPROBE | IRQ_LEVEL, 0);
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if (ret)
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goto out_domain_remove;
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gc = irq_get_domain_generic_chip(domain, 0);
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gc->reg_base = idtpic->base;
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gc->private = idtpic;
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ct = gc->chip_types;
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ct->regs.mask = IDT_PIC_IRQ_MASK;
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ct->chip.irq_mask = irq_gc_mask_set_bit;
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ct->chip.irq_unmask = irq_gc_mask_clr_bit;
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idtpic->gc = gc;
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/* Mask interrupts. */
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writel(0xffffffff, idtpic->base + IDT_PIC_IRQ_MASK);
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gc->mask_cache = 0xffffffff;
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irq_set_chained_handler_and_data(parent_irq,
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idt_irq_dispatch, idtpic);
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return 0;
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out_domain_remove:
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irq_domain_remove(domain);
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out_iounmap:
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iounmap(idtpic->base);
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out_unmap_irq:
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irq_dispose_mapping(parent_irq);
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out_free:
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kfree(idtpic);
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out_err:
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pr_err("Failed to initialize! (errno = %d)\n", ret);
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return ret;
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}
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IRQCHIP_DECLARE(idt_pic, "idt,32434-pic", idt_pic_init);
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