LXR linux/arch/xtensa/variants/s6000/irq.c

   1/*
   2 * s6000 irq crossbar
   3 *
   4 * Copyright (c) 2009 emlix GmbH
   5 * Authors:     Johannes Weiner <jw@emlix.com>
   6 *              Oskar Schirmer <os@emlix.com>
   7 */
   8#include <linux/io.h>
   9#include <asm/irq.h>
  10#include <variant/hardware.h>
  11
  12/* S6_REG_INTC */
  13#define INTC_STATUS     0x000
  14#define INTC_RAW        0x010
  15#define INTC_STATUS_AG  0x100
  16#define INTC_CFG(n)     (0x200 + 4 * (n))
  17
  18/*
  19 * The s6000 has a crossbar that multiplexes interrupt output lines
  20 * from the peripherals to input lines on the xtensa core.
  21 *
  22 * We leave the mapping decisions to the platform as it depends on the
  23 * actually connected peripherals which distribution makes sense.
  24 */
  25extern const signed char *platform_irq_mappings[NR_IRQS];
  26
  27static unsigned long scp_to_intc_enable[] = {
  28#define TO_INTC_ENABLE(n)       (((n) << 1) + 1)
  29        TO_INTC_ENABLE(0),
  30        TO_INTC_ENABLE(1),
  31        TO_INTC_ENABLE(2),
  32        TO_INTC_ENABLE(3),
  33        TO_INTC_ENABLE(4),
  34        TO_INTC_ENABLE(5),
  35        TO_INTC_ENABLE(6),
  36        TO_INTC_ENABLE(7),
  37        TO_INTC_ENABLE(8),
  38        TO_INTC_ENABLE(9),
  39        TO_INTC_ENABLE(10),
  40        TO_INTC_ENABLE(11),
  41        TO_INTC_ENABLE(12),
  42        -1,
  43        -1,
  44        TO_INTC_ENABLE(13),
  45        -1,
  46        TO_INTC_ENABLE(14),
  47        -1,
  48        TO_INTC_ENABLE(15),
  49#undef  TO_INTC_ENABLE
  50};
  51
  52static void irq_set(unsigned int irq, int enable)
  53{
  54        unsigned long en;
  55        const signed char *m = platform_irq_mappings[irq];
  56
  57        if (!m)
  58                return;
  59        en = enable ? scp_to_intc_enable[irq] : 0;
  60        while (*m >= 0) {
  61                writel(en, S6_REG_INTC + INTC_CFG(*m));
  62                m++;
  63        }
  64}
  65
  66void variant_irq_enable(unsigned int irq)
  67{
  68        irq_set(irq, 1);
  69}
  70
  71void variant_irq_disable(unsigned int irq)
  72{
  73        irq_set(irq, 0);
  74}
  75