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