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// SPDX-License-Identifier: GPL-2.0
/*
* SDK7786 FPGA NMI Support.
*
* Copyright (C) 2010 Paul Mundt
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <mach/fpga.h>
enum {
NMI_MODE_MANUAL,
NMI_MODE_AUX,
NMI_MODE_MASKED,
NMI_MODE_ANY,
NMI_MODE_UNKNOWN,
};
/*
* Default to the manual NMI switch.
*/
static unsigned int __initdata nmi_mode = NMI_MODE_ANY;
static int __init nmi_mode_setup(char *str)
{
if (!str)
return 0;
if (strcmp(str, "manual") == 0)
nmi_mode = NMI_MODE_MANUAL;
else if (strcmp(str, "aux") == 0)
nmi_mode = NMI_MODE_AUX;
else if (strcmp(str, "masked") == 0)
nmi_mode = NMI_MODE_MASKED;
else if (strcmp(str, "any") == 0)
nmi_mode = NMI_MODE_ANY;
else {
nmi_mode = NMI_MODE_UNKNOWN;
pr_warn("Unknown NMI mode %s\n", str);
}
printk("Set NMI mode to %d\n", nmi_mode);
return 0;
}
early_param("nmi_mode", nmi_mode_setup);
void __init sdk7786_nmi_init(void)
{
unsigned int source, mask, tmp;
switch (nmi_mode) {
case NMI_MODE_MANUAL:
source = NMISR_MAN_NMI;
mask = NMIMR_MAN_NMIM;
break;
case NMI_MODE_AUX:
source = NMISR_AUX_NMI;
mask = NMIMR_AUX_NMIM;
break;
case NMI_MODE_ANY:
source = NMISR_MAN_NMI | NMISR_AUX_NMI;
mask = NMIMR_MAN_NMIM | NMIMR_AUX_NMIM;
break;
case NMI_MODE_MASKED:
case NMI_MODE_UNKNOWN:
default:
source = mask = 0;
break;
}
/* Set the NMI source */
tmp = fpga_read_reg(NMISR);
tmp &= ~NMISR_MASK;
tmp |= source;
fpga_write_reg(tmp, NMISR);
/* And the IRQ masking */
fpga_write_reg(NMIMR_MASK ^ mask, NMIMR);
}
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