Import of Linux/MIPS 2.1.14

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/mips/sni/reset.c b/arch/mips/sni/reset.c
new file mode 100644
index 000000000..9dd017a7c
--- /dev/null
+++ b/arch/mips/sni/reset.c
@@ -0,0 +1,38 @@
+/*
+ *  linux/arch/mips/sni/process.c
+ *
+ *  Reset a SNI machine.
+ */
+#include <asm/io.h>
+#include <asm/system.h>
+
+/*
+ * This routine reboots the machine by asking the keyboard
+ * controller to pulse the reset-line low. We try that for a while,
+ * and if it doesn't work, we do some other stupid things.
+ */
+static inline void
+kb_wait(void)
+{
+	int i;
+
+	for (i=0; i<0x10000; i++)
+		if ((inb_p(0x64) & 0x02) == 0)
+			break;
+}
+
+void
+sni_hard_reset_now(void)
+{
+	int i, j;
+
+	sti();
+	for (;;) {
+		for (i=0; i<100; i++) {
+			kb_wait();
+			for(j = 0; j < 100000 ; j++)
+				/* nothing */;
+			outb_p(0xfe,0x64);	 /* pulse reset low */
+		}
+	}
+}