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-rw-r--r--cpu/mpc5xxx/speed.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/cpu/mpc5xxx/speed.c b/cpu/mpc5xxx/speed.c
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+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <mpc5xxx.h>
+#include <asm/processor.h>
+
+/* ------------------------------------------------------------------------- */
+
+/* Bus-to-Core Multipliers */
+
+static int bus2core[] = {
+ 0, 0, 0, 10, 20, 20, 25, 45,
+ 30, 55, 40, 50, 0, 60, 35, 0,
+ 30, 25, 65, 10, 70, 20, 75, 45,
+ 0, 55, 40, 50, 80, 60, 35, 0
+};
+/* ------------------------------------------------------------------------- */
+
+/*
+ *
+ */
+
+int get_clocks (void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+
+ ulong 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)) {
+ gd->bus_clk = vco / 8;
+ } else {
+ gd->bus_clk = vco / 4;
+ }
+ gd->cpu_clk = gd->bus_clk * bus2core[val & 0x1f] / 10;
+
+ val = *(vu_long *)MPC5XXX_CDM_CFG;
+ if (val & (1 << 8)) {
+ gd->ipb_clk = gd->bus_clk / 2;
+ } else {
+ gd->ipb_clk = gd->bus_clk;
+ }
+ switch (val & 3) {
+ case 0: gd->pci_clk = gd->ipb_clk; break;
+ case 1: gd->pci_clk = gd->ipb_clk / 2; break;
+ default: gd->pci_clk = gd->bus_clk / 4; break;
+ }
+
+ return (0);
+}
+
+int prt_mpc5xxx_clks (void)
+{
+ DECLARE_GLOBAL_DATA_PTR;
+
+ printf(" Bus %ld MHz, IPB %ld MHz, PCI %ld MHz\n",
+ gd->bus_clk / 1000000, gd->ipb_clk / 1000000,
+ gd->pci_clk / 1000000);
+
+ return (0);
+}
+
+/* ------------------------------------------------------------------------- */