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122 lines
2.8 KiB
122 lines
2.8 KiB
// 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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