Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / arch / sh / boards / mach-sdk7786 / nmi.c

diff --git a/arch/sh/boards/mach-sdk7786/nmi.c b/arch/sh/boards/mach-sdk7786/nmi.c
new file mode 100644 (file)
index 0000000..edcfa1f
--- /dev/null
+++ b/arch/sh/boards/mach-sdk7786/nmi.c
@@ -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);
+}