1 files changed, 101 insertions, 0 deletions
diff --git a/arch/powerpc/mach-mpc5xxx/speed.c b/arch/powerpc/mach-mpc5xxx/speed.c
new file mode 100644
index 0000000000..760d923bcf
--- /dev/null
+++ b/arch/powerpc/mach-mpc5xxx/speed.c
@@ -0,0 +1,101 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <mach/mpc5xxx.h>
+#include <init.h>
+#include <asm/processor.h>
+#include <types.h>
+#include <mach/clock.h>
+
+/* Bus-to-Core Multipliers */
+
+static int bus2core[] = {
+	3, 2, 2, 2, 4, 4, 5, 9,
+	6, 11, 8, 10, 3, 12, 7, 0,
+	6, 5, 13, 2, 14, 4, 15, 9,
+	0, 11, 8, 10, 16, 12, 7, 0
+};
+
+unsigned long get_bus_clock(void)
+{
+	unsigned long val, vco;
+
+#if !defined(CFG_MPC5XXX_CLKIN)
+#error clock measuring not implemented yet - define CFG_MPC5XXX_CLKIN
+#endif
+
+	val = *(vu_long *)MPC5XXX_CDM_PORCFG;
+	if (val & (1 << 6))
+		vco = CFG_MPC5XXX_CLKIN * 12;
+	else
+		vco = CFG_MPC5XXX_CLKIN * 16;
+
+	if (val & (1 << 5))
+		return vco / 8;
+	else
+		return vco / 4;
+}
+
+unsigned long get_cpu_clock(void)
+{
+	unsigned long val;
+	val = *(vu_long *)MPC5XXX_CDM_PORCFG;
+	return get_bus_clock() * bus2core[val & 0x1f] / 2;
+}
+
+unsigned long get_ipb_clock(void)
+{
+	unsigned long val;
+
+	val = *(vu_long *)MPC5XXX_CDM_CFG;
+	if (val & (1 << 8))
+		return get_bus_clock() / 2;
+	else
+		return get_bus_clock();
+}
+
+unsigned long get_pci_clock(void)
+{
+	unsigned long val;
+
+	val = *(vu_long *)MPC5XXX_CDM_CFG;
+	switch (val & 3) {
+		case 0:
+			return get_ipb_clock();
+		case 1:
+			return get_ipb_clock() / 2;
+		default:
+			return get_bus_clock() / 4;
+	}
+}
+
+unsigned long get_timebase_clock(void)
+{
+	return (get_bus_clock() + 3L) / 4L;
+}
+
+static int prt_mpc5xxx_clks (void)
+{
+	printf("       Bus %ld MHz, IPB %ld MHz, PCI %ld MHz\n",
+			get_bus_clock() / 1000000, get_ipb_clock() / 1000000,
+			get_pci_clock() / 1000000);
+
+	return 0;
+}
+
+late_initcall(prt_mpc5xxx_clks);
+