mirror of https://gitee.com/openkylin/linux.git
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
/*
|
|
* SDK7786 FPGA NMI Support.
|
|
*
|
|
* Copyright (C) 2010 Paul Mundt
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#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_warning("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);
|
|
}
|