1 files changed, 80 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-sdk7786/nmi.c b/arch/sh/boards/mach-sdk7786/nmi.c
new file mode 100644
index 0000000000..afba49679a
--- /dev/null
+++ b/arch/sh/boards/mach-sdk7786/nmi.c
@@ -0,0 +1,80 @@
+// 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);
+}