MIPS: add support for SGI Octane (IP30)

This changeset adds support for SGI Octane/Octane2 workstations.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/mips/sgi-ip30/ip30-power.c b/arch/mips/sgi-ip30/ip30-power.c
new file mode 100644
index 000000000000..120b3f3d5108
--- /dev/null
+++ b/arch/mips/sgi-ip30/ip30-power.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ip30-power.c: Software powerdown and reset handling for IP30 architecture.
+ *
+ * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
+ *               2014 Joshua Kinard <kumba@gentoo.org>
+ *               2009 Johannes Dickgreber <tanzy@gmx.de>
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/notifier.h>
+#include <linux/delay.h>
+#include <linux/rtc/ds1685.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+
+#include <asm/reboot.h>
+#include <asm/sgi/heart.h>
+
+static void __noreturn ip30_machine_restart(char *cmd)
+{
+	/*
+	 * Execute HEART cold reset
+	 *   Yes, it's cold-HEARTed!
+	 */
+	heart_write((heart_read(&heart_regs->mode) | HM_COLD_RST),
+		    &heart_regs->mode);
+	unreachable();
+}
+
+static int __init ip30_reboot_setup(void)
+{
+	_machine_restart = ip30_machine_restart;
+
+	return 0;
+}
+
+subsys_initcall(ip30_reboot_setup);