94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
/*
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* H8/300H interrupt controller driver
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*
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* Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
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*/
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/irqchip.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/io.h>
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static const char ipr_bit[] = {
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7, 6, 5, 5,
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4, 4, 4, 4, 3, 3, 3, 3,
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2, 2, 2, 2, 1, 1, 1, 1,
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0, 0, 0, 0, 15, 15, 15, 15,
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14, 14, 14, 14, 13, 13, 13, 13,
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-1, -1, -1, -1, 11, 11, 11, 11,
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10, 10, 10, 10, 9, 9, 9, 9,
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};
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static void __iomem *intc_baseaddr;
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#define IPR (intc_baseaddr + 6)
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static void h8300h_disable_irq(struct irq_data *data)
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{
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int bit;
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int irq = data->irq - 12;
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bit = ipr_bit[irq];
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if (bit >= 0) {
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if (bit < 8)
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ctrl_bclr(bit & 7, IPR);
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else
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ctrl_bclr(bit & 7, (IPR+1));
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}
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}
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static void h8300h_enable_irq(struct irq_data *data)
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{
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int bit;
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int irq = data->irq - 12;
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bit = ipr_bit[irq];
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if (bit >= 0) {
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if (bit < 8)
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ctrl_bset(bit & 7, IPR);
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else
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ctrl_bset(bit & 7, (IPR+1));
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}
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}
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struct irq_chip h8300h_irq_chip = {
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.name = "H8/300H-INTC",
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.irq_enable = h8300h_enable_irq,
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.irq_disable = h8300h_disable_irq,
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};
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static int irq_map(struct irq_domain *h, unsigned int virq,
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irq_hw_number_t hw_irq_num)
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{
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irq_set_chip_and_handler(virq, &h8300h_irq_chip, handle_simple_irq);
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return 0;
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}
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static struct irq_domain_ops irq_ops = {
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.map = irq_map,
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.xlate = irq_domain_xlate_onecell,
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};
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static int __init h8300h_intc_of_init(struct device_node *intc,
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struct device_node *parent)
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{
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struct irq_domain *domain;
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intc_baseaddr = of_iomap(intc, 0);
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BUG_ON(!intc_baseaddr);
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/* All interrupt priority low */
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writeb(0x00, IPR + 0);
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writeb(0x00, IPR + 1);
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domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL);
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BUG_ON(!domain);
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irq_set_default_host(domain);
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return 0;
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}
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IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init);
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