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Linux/arch/sh/boards/mach-sdk7786/nmi.c

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  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 
 12 enum {
 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  */
 23 static unsigned int __initdata nmi_mode = NMI_MODE_ANY;
 24 
 25 static 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_warning("Unknown NMI mode %s\n", str);
 41         }
 42 
 43         printk("Set NMI mode to %d\n", nmi_mode);
 44         return 0;
 45 }
 46 early_param("nmi_mode", nmi_mode_setup);
 47 
 48 void __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 

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