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

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