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sh: mach-sdk7786: Handle baseboard NMI source selection.

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The on-board NMI switch is routed through and mangled by the FPGA prior
to its delivery to the NMI pin, so add some glue for the various
configuration options. The default is to unmask it and enable all input
sources.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-12-17 18:58:04 +09:00
parent c43328e890
commit 76496f8f2e
4 changed files with 93 additions and 1 deletions
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2
arch/sh/boards/mach-sdk7786/Makefile
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@ -1,4 +1,4 @@
obj-y := fpga.o irq.o setup.o
obj-y := fpga.o irq.o nmi.o setup.o
obj-$(CONFIG_GENERIC_GPIO) += gpio.o
obj-$(CONFIG_HAVE_SRAM_POOL) += sram.o

83
arch/sh/boards/mach-sdk7786/nmi.c Normal file
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@ -0,0 +1,83 @@
/*
* 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);
}

1
arch/sh/boards/mach-sdk7786/setup.c
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@ -237,6 +237,7 @@ static void __init sdk7786_setup(char **cmdline_p)
pr_info("Renesas Technology Europe SDK7786 support:\n");
sdk7786_fpga_init();
sdk7786_nmi_init();
pr_info("\tPCB revision:\t%d\n", fpga_read_reg(PCBRR) & 0xf);

8
arch/sh/include/mach-sdk7786/mach/fpga.h
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@ -14,11 +14,16 @@
#define INTTESTR 0x040
#define SYSSR 0x050
#define NRGPR 0x060
#define NMISR 0x070
#define NMISR_MAN_NMI BIT(0)
#define NMISR_AUX_NMI BIT(1)
#define NMISR_MASK (NMISR_MAN_NMI | NMISR_AUX_NMI)
#define NMIMR 0x080
#define NMIMR_MAN_NMIM BIT(0) /* Manual NMI mask */
#define NMIMR_AUX_NMIM BIT(1) /* Auxiliary NMI mask */
#define NMIMR_MASK (NMIMR_MAN_NMIM | NMIMR_AUX_NMIM)
#define INTBSR 0x090
#define INTBMR 0x0a0
@ -126,6 +131,9 @@
extern void __iomem *sdk7786_fpga_base;
extern void sdk7786_fpga_init(void);
/* arch/sh/boards/mach-sdk7786/nmi.c */
extern void sdk7786_nmi_init(void);
#define SDK7786_FPGA_REGADDR(reg) (sdk7786_fpga_base + (reg))
/*