drivers/irqchip/irq-renesas-h8s.c

   1 /*
   2  * H8S interrupt contoller driver
   3  *
   4  * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
   5  */
   6
   7 #include <linux/irq.h>
   8 #include <linux/irqchip.h>
   9 #include <linux/of_address.h>
  10 #include <linux/of_irq.h>
  11 #include <asm/io.h>
  12
  13 static void *intc_baseaddr;
  14 #define IPRA ((unsigned long)intc_baseaddr)
  15
  16 static const unsigned char ipr_table[] = {
  17         0x03, 0x02, 0x01, 0x00, 0x13, 0x12, 0x11, 0x10, /* 16 - 23 */
  18         0x23, 0x22, 0x21, 0x20, 0x33, 0x32, 0x31, 0x30, /* 24 - 31 */
  19         0x43, 0x42, 0x41, 0x40, 0x53, 0x53, 0x52, 0x52, /* 32 - 39 */
  20         0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, 0x51, /* 40 - 47 */
  21         0x50, 0x50, 0x50, 0x50, 0x63, 0x63, 0x63, 0x63, /* 48 - 55 */
  22         0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, 0x62, /* 56 - 63 */
  23         0x61, 0x61, 0x61, 0x61, 0x60, 0x60, 0x60, 0x60, /* 64 - 71 */
  24         0x73, 0x73, 0x73, 0x73, 0x72, 0x72, 0x72, 0x72, /* 72 - 79 */
  25         0x71, 0x71, 0x71, 0x71, 0x70, 0x83, 0x82, 0x81, /* 80 - 87 */
  26         0x80, 0x80, 0x80, 0x80, 0x93, 0x93, 0x93, 0x93, /* 88 - 95 */
  27         0x92, 0x92, 0x92, 0x92, 0x91, 0x91, 0x91, 0x91, /* 96 - 103 */
  28         0x90, 0x90, 0x90, 0x90, 0xa3, 0xa3, 0xa3, 0xa3, /* 104 - 111 */
  29         0xa2, 0xa2, 0xa2, 0xa2, 0xa1, 0xa1, 0xa1, 0xa1, /* 112 - 119 */
  30         0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, 0xa0, /* 120 - 127 */
  31 };
  32
  33 static void h8s_disable_irq(struct irq_data *data)
  34 {
  35         int pos;
  36         unsigned int addr;
  37         unsigned short pri;
  38         int irq = data->irq;
  39
  40         addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3);
  41         pos = (ipr_table[irq - 16] & 0x0f) * 4;
  42         pri = ~(0x000f << pos);
  43         pri &= readw(addr);
  44         writew(pri, addr);
  45 }
  46
  47 static void h8s_enable_irq(struct irq_data *data)
  48 {
  49         int pos;
  50         unsigned int addr;
  51         unsigned short pri;
  52         int irq = data->irq;
  53
  54         addr = IPRA + ((ipr_table[irq - 16] & 0xf0) >> 3);
  55         pos = (ipr_table[irq - 16] & 0x0f) * 4;
  56         pri = ~(0x000f << pos);
  57         pri &= readw(addr);
  58         pri |= 1 << pos;
  59         writew(pri, addr);
  60 }
  61
  62 struct irq_chip h8s_irq_chip = {
  63         .name           = "H8S-INTC",
  64         .irq_enable     = h8s_enable_irq,
  65         .irq_disable    = h8s_disable_irq,
  66 };
  67
  68 static __init int irq_map(struct irq_domain *h, unsigned int virq,
  69                           irq_hw_number_t hw_irq_num)
  70 {
  71        irq_set_chip_and_handler(virq, &h8s_irq_chip, handle_simple_irq);
  72
  73        return 0;
  74 }
  75
  76 static const struct irq_domain_ops irq_ops = {
  77        .map    = irq_map,
  78        .xlate  = irq_domain_xlate_onecell,
  79 };
  80
  81 static int __init h8s_intc_of_init(struct device_node *intc,
  82                                    struct device_node *parent)
  83 {
  84         struct irq_domain *domain;
  85         int n;
  86
  87         intc_baseaddr = of_iomap(intc, 0);
  88         BUG_ON(!intc_baseaddr);
  89
  90         /* All interrupt priority is 0 (disable) */
  91         /* IPRA to IPRK */
  92         for (n = 0; n <= 'k' - 'a'; n++)
  93                 writew(0x0000, IPRA + (n * 2));
  94
  95         domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL);
  96         BUG_ON(!domain);
  97         irq_set_default_host(domain);
  98         return 0;
  99 }
 100
 101 IRQCHIP_DECLARE(h8s_intc, "renesas,h8s-intc", h8s_intc_of_init);