1 files changed, 144 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/devices.c b/arch/sparc64/kernel/devices.c
new file mode 100644
index 00000000000..d710274e516
--- /dev/null
+++ b/arch/sparc64/kernel/devices.c
@@ -0,0 +1,144 @@
+/* devices.c: Initial scan of the prom device tree for important
+ *            Sparc device nodes which we need to find.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/threads.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/string.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+
+#include <asm/page.h>
+#include <asm/oplib.h>
+#include <asm/system.h>
+#include <asm/smp.h>
+#include <asm/spitfire.h>
+#include <asm/timer.h>
+#include <asm/cpudata.h>
+
+/* Used to synchronize acceses to NatSemi SUPER I/O chip configure
+ * operations in asm/ns87303.h
+ */
+DEFINE_SPINLOCK(ns87303_lock);
+
+extern void cpu_probe(void);
+extern void central_probe(void);
+
+static char *cpu_mid_prop(void)
+{
+	if (tlb_type == spitfire)
+		return "upa-portid";
+	return "portid";
+}
+
+static int check_cpu_node(int nd, int *cur_inst,
+			  int (*compare)(int, int, void *), void *compare_arg,
+			  int *prom_node, int *mid)
+{
+	char node_str[128];
+
+	prom_getstring(nd, "device_type", node_str, sizeof(node_str));
+	if (strcmp(node_str, "cpu"))
+		return -ENODEV;
+
+	if (!compare(nd, *cur_inst, compare_arg)) {
+		if (prom_node)
+			*prom_node = nd;
+		if (mid)
+			*mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
+		return 0;
+	}
+
+	(*cur_inst)++;
+
+	return -ENODEV;
+}
+
+static int __cpu_find_by(int (*compare)(int, int, void *), void *compare_arg,
+			 int *prom_node, int *mid)
+{
+	int nd, cur_inst, err;
+
+	nd = prom_root_node;
+	cur_inst = 0;
+
+	err = check_cpu_node(nd, &cur_inst,
+			     compare, compare_arg,
+			     prom_node, mid);
+	if (err == 0)
+		return 0;
+
+	nd = prom_getchild(nd);
+	while ((nd = prom_getsibling(nd)) != 0) {
+		err = check_cpu_node(nd, &cur_inst,
+				     compare, compare_arg,
+				     prom_node, mid);
+		if (err == 0)
+			return 0;
+	}
+
+	return -ENODEV;
+}
+
+static int cpu_instance_compare(int nd, int instance, void *_arg)
+{
+	int desired_instance = (int) (long) _arg;
+
+	if (instance == desired_instance)
+		return 0;
+	return -ENODEV;
+}
+
+int cpu_find_by_instance(int instance, int *prom_node, int *mid)
+{
+	return __cpu_find_by(cpu_instance_compare, (void *)(long)instance,
+			     prom_node, mid);
+}
+
+static int cpu_mid_compare(int nd, int instance, void *_arg)
+{
+	int desired_mid = (int) (long) _arg;
+	int this_mid;
+
+	this_mid = prom_getintdefault(nd, cpu_mid_prop(), 0);
+	if (this_mid == desired_mid)
+		return 0;
+	return -ENODEV;
+}
+
+int cpu_find_by_mid(int mid, int *prom_node)
+{
+	return __cpu_find_by(cpu_mid_compare, (void *)(long)mid,
+			     prom_node, NULL);
+}
+
+void __init device_scan(void)
+{
+	/* FIX ME FAST... -DaveM */
+	ioport_resource.end = 0xffffffffffffffffUL;
+
+	prom_printf("Booting Linux...\n");
+
+#ifndef CONFIG_SMP
+	{
+		int err, cpu_node;
+		err = cpu_find_by_instance(0, &cpu_node, NULL);
+		if (err) {
+			prom_printf("No cpu nodes, cannot continue\n");
+			prom_halt();
+		}
+		cpu_data(0).clock_tick = prom_getintdefault(cpu_node,
+							    "clock-frequency",
+							    0);
+	}
+#endif
+
+	central_probe();
+
+	cpu_probe();
+}