LXR linux/arch/sh/boards/mach-sdk7786/nmi.c

   1/*
   2 * SDK7786 FPGA NMI Support.
   3 *
   4 * Copyright (C) 2010  Paul Mundt
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10#include <linux/init.h>
  11#include <linux/kernel.h>
  12#include <linux/string.h>
  13#include <mach/fpga.h>
  14
  15enum {
  16        NMI_MODE_MANUAL,
  17        NMI_MODE_AUX,
  18        NMI_MODE_MASKED,
  19        NMI_MODE_ANY,
  20        NMI_MODE_UNKNOWN,
  21};
  22
  23/*
  24 * Default to the manual NMI switch.
  25 */
  26static unsigned int __initdata nmi_mode = NMI_MODE_ANY;
  27
  28static int __init nmi_mode_setup(char *str)
  29{
  30        if (!str)
  31                return 0;
  32
  33        if (strcmp(str, "manual") == 0)
  34                nmi_mode = NMI_MODE_MANUAL;
  35        else if (strcmp(str, "aux") == 0)
  36                nmi_mode = NMI_MODE_AUX;
  37        else if (strcmp(str, "masked") == 0)
  38                nmi_mode = NMI_MODE_MASKED;
  39        else if (strcmp(str, "any") == 0)
  40                nmi_mode = NMI_MODE_ANY;
  41        else {
  42                nmi_mode = NMI_MODE_UNKNOWN;
  43                pr_warning("Unknown NMI mode %s\n", str);
  44        }
  45
  46        printk("Set NMI mode to %d\n", nmi_mode);
  47        return 0;
  48}
  49early_param("nmi_mode", nmi_mode_setup);
  50
  51void __init sdk7786_nmi_init(void)
  52{
  53        unsigned int source, mask, tmp;
  54
  55        switch (nmi_mode) {
  56        case NMI_MODE_MANUAL:
  57                source = NMISR_MAN_NMI;
  58                mask = NMIMR_MAN_NMIM;
  59                break;
  60        case NMI_MODE_AUX:
  61                source = NMISR_AUX_NMI;
  62                mask = NMIMR_AUX_NMIM;
  63                break;
  64        case NMI_MODE_ANY:
  65                source = NMISR_MAN_NMI | NMISR_AUX_NMI;
  66                mask = NMIMR_MAN_NMIM | NMIMR_AUX_NMIM;
  67                break;
  68        case NMI_MODE_MASKED:
  69        case NMI_MODE_UNKNOWN:
  70        default:
  71                source = mask = 0;
  72                break;
  73        }
  74
  75        /* Set the NMI source */
  76        tmp = fpga_read_reg(NMISR);
  77        tmp &= ~NMISR_MASK;
  78        tmp |= source;
  79        fpga_write_reg(tmp, NMISR);
  80
  81        /* And the IRQ masking */
  82        fpga_write_reg(NMIMR_MASK ^ mask, NMIMR);
  83}
  84