v4.19.13 snapshot.
diff --git a/arch/sparc/kernel/power.c b/arch/sparc/kernel/power.c
new file mode 100644
index 0000000..92627ab
--- /dev/null
+++ b/arch/sparc/kernel/power.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/* power.c: Power management driver.
+ *
+ * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+#include <linux/of_device.h>
+
+#include <asm/prom.h>
+#include <asm/io.h>
+
+static void __iomem *power_reg;
+
+static irqreturn_t power_handler(int irq, void *dev_id)
+{
+ orderly_poweroff(true);
+
+ /* FIXME: Check registers for status... */
+ return IRQ_HANDLED;
+}
+
+static int has_button_interrupt(unsigned int irq, struct device_node *dp)
+{
+ if (irq == 0xffffffff)
+ return 0;
+ if (!of_find_property(dp, "button", NULL))
+ return 0;
+
+ return 1;
+}
+
+static int power_probe(struct platform_device *op)
+{
+ struct resource *res = &op->resource[0];
+ unsigned int irq = op->archdata.irqs[0];
+
+ power_reg = of_ioremap(res, 0, 0x4, "power");
+
+ printk(KERN_INFO "%s: Control reg at %llx\n",
+ op->dev.of_node->name, res->start);
+
+ if (has_button_interrupt(irq, op->dev.of_node)) {
+ if (request_irq(irq,
+ power_handler, 0, "power", NULL) < 0)
+ printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
+ }
+
+ return 0;
+}
+
+static const struct of_device_id power_match[] = {
+ {
+ .name = "power",
+ },
+ {},
+};
+
+static struct platform_driver power_driver = {
+ .probe = power_probe,
+ .driver = {
+ .name = "power",
+ .of_match_table = power_match,
+ },
+};
+
+builtin_platform_driver(power_driver);