125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/*
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* linux/drivers/irqchip/irq-zevio.c
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*
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* Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2, as
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* published by the Free Software Foundation.
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*
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*/
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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/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 <asm/mach/irq.h>
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#include <asm/exception.h>
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#define IO_STATUS 0x000
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#define IO_RAW_STATUS 0x004
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#define IO_ENABLE 0x008
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#define IO_DISABLE 0x00C
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#define IO_CURRENT 0x020
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#define IO_RESET 0x028
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#define IO_MAX_PRIOTY 0x02C
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#define IO_IRQ_BASE 0x000
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#define IO_FIQ_BASE 0x100
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#define IO_INVERT_SEL 0x200
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#define IO_STICKY_SEL 0x204
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#define IO_PRIORITY_SEL 0x300
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#define MAX_INTRS 32
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#define FIQ_START MAX_INTRS
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static struct irq_domain *zevio_irq_domain;
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static void __iomem *zevio_irq_io;
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static void zevio_irq_ack(struct irq_data *irqd)
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{
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struct irq_chip_generic *gc = irq_data_get_irq_chip_data(irqd);
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struct irq_chip_regs *regs = &irq_data_get_chip_type(irqd)->regs;
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readl(gc->reg_base + regs->ack);
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}
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static void __exception_irq_entry zevio_handle_irq(struct pt_regs *regs)
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{
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int irqnr;
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while (readl(zevio_irq_io + IO_STATUS)) {
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irqnr = readl(zevio_irq_io + IO_CURRENT);
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handle_domain_irq(zevio_irq_domain, irqnr, regs);
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};
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}
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static void __init zevio_init_irq_base(void __iomem *base)
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{
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/* Disable all interrupts */
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writel(~0, base + IO_DISABLE);
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/* Accept interrupts of all priorities */
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writel(0xF, base + IO_MAX_PRIOTY);
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/* Reset existing interrupts */
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readl(base + IO_RESET);
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}
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static int __init zevio_of_init(struct device_node *node,
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struct device_node *parent)
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{
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unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
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struct irq_chip_generic *gc;
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int ret;
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if (WARN_ON(zevio_irq_io || zevio_irq_domain))
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return -EBUSY;
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zevio_irq_io = of_iomap(node, 0);
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BUG_ON(!zevio_irq_io);
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/* Do not invert interrupt status bits */
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writel(~0, zevio_irq_io + IO_INVERT_SEL);
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/* Disable sticky interrupts */
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writel(0, zevio_irq_io + IO_STICKY_SEL);
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/* We don't use IRQ priorities. Set each IRQ to highest priority. */
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memset_io(zevio_irq_io + IO_PRIORITY_SEL, 0, MAX_INTRS * sizeof(u32));
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/* Init IRQ and FIQ */
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zevio_init_irq_base(zevio_irq_io + IO_IRQ_BASE);
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zevio_init_irq_base(zevio_irq_io + IO_FIQ_BASE);
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zevio_irq_domain = irq_domain_add_linear(node, MAX_INTRS,
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&irq_generic_chip_ops, NULL);
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BUG_ON(!zevio_irq_domain);
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ret = irq_alloc_domain_generic_chips(zevio_irq_domain, MAX_INTRS, 1,
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"zevio_intc", handle_level_irq,
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clr, 0, IRQ_GC_INIT_MASK_CACHE);
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BUG_ON(ret);
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gc = irq_get_domain_generic_chip(zevio_irq_domain, 0);
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gc->reg_base = zevio_irq_io;
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gc->chip_types[0].chip.irq_ack = zevio_irq_ack;
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gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg;
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gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg;
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gc->chip_types[0].regs.mask = IO_IRQ_BASE + IO_ENABLE;
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gc->chip_types[0].regs.enable = IO_IRQ_BASE + IO_ENABLE;
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gc->chip_types[0].regs.disable = IO_IRQ_BASE + IO_DISABLE;
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gc->chip_types[0].regs.ack = IO_IRQ_BASE + IO_RESET;
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set_handle_irq(zevio_handle_irq);
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pr_info("TI-NSPIRE classic IRQ controller\n");
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return 0;
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}
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IRQCHIP_DECLARE(zevio_irq, "lsi,zevio-intc", zevio_of_init);
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