LXR linux/drivers/irqchip/irq-renesas-h8300h.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * H8/300H interrupt controller driver
   4 *
   5 * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
   6 */
   7
   8#include <linux/init.h>
   9#include <linux/irq.h>
  10#include <linux/irqchip.h>
  11#include <linux/of_address.h>
  12#include <linux/of_irq.h>
  13#include <asm/io.h>
  14
  15static const char ipr_bit[] = {
  16         7,  6,  5,  5,
  17         4,  4,  4,  4,  3,  3,  3,  3,
  18         2,  2,  2,  2,  1,  1,  1,  1,
  19         0,  0,  0,  0, 15, 15, 15, 15,
  20        14, 14, 14, 14, 13, 13, 13, 13,
  21        -1, -1, -1, -1, 11, 11, 11, 11,
  22        10, 10, 10, 10,  9,  9,  9,  9,
  23};
  24
  25static void __iomem *intc_baseaddr;
  26
  27#define IPR (intc_baseaddr + 6)
  28
  29static void h8300h_disable_irq(struct irq_data *data)
  30{
  31        int bit;
  32        int irq = data->irq - 12;
  33
  34        bit = ipr_bit[irq];
  35        if (bit >= 0) {
  36                if (bit < 8)
  37                        ctrl_bclr(bit & 7, IPR);
  38                else
  39                        ctrl_bclr(bit & 7, (IPR+1));
  40        }
  41}
  42
  43static void h8300h_enable_irq(struct irq_data *data)
  44{
  45        int bit;
  46        int irq = data->irq - 12;
  47
  48        bit = ipr_bit[irq];
  49        if (bit >= 0) {
  50                if (bit < 8)
  51                        ctrl_bset(bit & 7, IPR);
  52                else
  53                        ctrl_bset(bit & 7, (IPR+1));
  54        }
  55}
  56
  57struct irq_chip h8300h_irq_chip = {
  58        .name           = "H8/300H-INTC",
  59        .irq_enable     = h8300h_enable_irq,
  60        .irq_disable    = h8300h_disable_irq,
  61};
  62
  63static int irq_map(struct irq_domain *h, unsigned int virq,
  64                   irq_hw_number_t hw_irq_num)
  65{
  66       irq_set_chip_and_handler(virq, &h8300h_irq_chip, handle_simple_irq);
  67
  68       return 0;
  69}
  70
  71static const struct irq_domain_ops irq_ops = {
  72       .map    = irq_map,
  73       .xlate  = irq_domain_xlate_onecell,
  74};
  75
  76static int __init h8300h_intc_of_init(struct device_node *intc,
  77                                      struct device_node *parent)
  78{
  79        struct irq_domain *domain;
  80
  81        intc_baseaddr = of_iomap(intc, 0);
  82        BUG_ON(!intc_baseaddr);
  83
  84        /* All interrupt priority low */
  85        writeb(0x00, IPR + 0);
  86        writeb(0x00, IPR + 1);
  87
  88        domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL);
  89        BUG_ON(!domain);
  90        irq_set_default_host(domain);
  91        return 0;
  92}
  93
  94IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init);
  95