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-rw-r--r--arch/sh/boards/mach-sdk7786/nmi.c80
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);
+}