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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * SDK7786 FPGA NMI Support.
   4 *
   5 * Copyright (C) 2010  Paul Mundt
   6 */
   7#include <linux/init.h>
   8#include <linux/kernel.h>
   9#include <linux/string.h>
  10#include <mach/fpga.h>
  11
  12enum {
  13        NMI_MODE_MANUAL,
  14        NMI_MODE_AUX,
  15        NMI_MODE_MASKED,
  16        NMI_MODE_ANY,
  17        NMI_MODE_UNKNOWN,
  18};
  19
  20/*
  21 * Default to the manual NMI switch.
  22 */
  23static unsigned int __initdata nmi_mode = NMI_MODE_ANY;
  24
  25static int __init nmi_mode_setup(char *str)
  26{
  27        if (!str)
  28                return 0;
  29
  30        if (strcmp(str, "manual") == 0)
  31                nmi_mode = NMI_MODE_MANUAL;
  32        else if (strcmp(str, "aux") == 0)
  33                nmi_mode = NMI_MODE_AUX;
  34        else if (strcmp(str, "masked") == 0)
  35                nmi_mode = NMI_MODE_MASKED;
  36        else if (strcmp(str, "any") == 0)
  37                nmi_mode = NMI_MODE_ANY;
  38        else {
  39                nmi_mode = NMI_MODE_UNKNOWN;
  40                pr_warn("Unknown NMI mode %s\n", str);
  41        }
  42
  43        printk("Set NMI mode to %d\n", nmi_mode);
  44        return 0;
  45}
  46early_param("nmi_mode", nmi_mode_setup);
  47
  48void __init sdk7786_nmi_init(void)
  49{
  50        unsigned int source, mask, tmp;
  51
  52        switch (nmi_mode) {
  53        case NMI_MODE_MANUAL:
  54                source = NMISR_MAN_NMI;
  55                mask = NMIMR_MAN_NMIM;
  56                break;
  57        case NMI_MODE_AUX:
  58                source = NMISR_AUX_NMI;
  59                mask = NMIMR_AUX_NMIM;
  60                break;
  61        case NMI_MODE_ANY:
  62                source = NMISR_MAN_NMI | NMISR_AUX_NMI;
  63                mask = NMIMR_MAN_NMIM | NMIMR_AUX_NMIM;
  64                break;
  65        case NMI_MODE_MASKED:
  66        case NMI_MODE_UNKNOWN:
  67        default:
  68                source = mask = 0;
  69                break;
  70        }
  71
  72        /* Set the NMI source */
  73        tmp = fpga_read_reg(NMISR);
  74        tmp &= ~NMISR_MASK;
  75        tmp |= source;
  76        fpga_write_reg(tmp, NMISR);
  77
  78        /* And the IRQ masking */
  79        fpga_write_reg(NMIMR_MASK ^ mask, NMIMR);
  80}
  81