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Diffstat (limited to 'arch/ppc/cpu/mpc5xx/speed.c')
-rw-r--r--arch/ppc/cpu/mpc5xx/speed.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/ppc/cpu/mpc5xx/speed.c b/arch/ppc/cpu/mpc5xx/speed.c
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+++ b/arch/ppc/cpu/mpc5xx/speed.c
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+/*
+ * (C) Copyright 2003
+ * Martin Winistoerfer, martinwinistoerfer@gmx.ch.
+ *
+ * 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,
+ */
+
+/*
+ * File: speed.c
+ *
+ * Discription: Provides cpu speed calculation
+ *
+ */
+
+#include <common.h>
+#include <mpc5xx.h>
+#include <asm/processor.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Get cpu and bus clock
+ */
+int get_clocks (void)
+{
+ volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+
+#ifndef CONFIG_5xx_GCLK_FREQ
+ uint divf = (immr->im_clkrst.car_plprcr & PLPRCR_DIVF_MSK);
+ uint mf = ((immr->im_clkrst.car_plprcr & PLPRCR_MF_MSK) >> PLPRCR_MF_SHIFT);
+ ulong vcoout;
+
+ vcoout = (CONFIG_SYS_OSC_CLK / (divf + 1)) * (mf + 1) * 2;
+ if(immr->im_clkrst.car_plprcr & PLPRCR_CSRC_MSK) {
+ gd->cpu_clk = vcoout / (2^(((immr->im_clkrst.car_sccr & SCCR_DFNL_MSK) >> SCCR_DFNL_SHIFT) + 1));
+ } else {
+ gd->cpu_clk = vcoout / (2^(immr->im_clkrst.car_sccr & SCCR_DFNH_MSK));
+ }
+
+#else /* CONFIG_5xx_GCLK_FREQ */
+ gd->bus_clk = CONFIG_5xx_GCLK_FREQ;
+#endif /* CONFIG_5xx_GCLK_FREQ */
+
+ if ((immr->im_clkrst.car_sccr & SCCR_EBDF11) == 0) {
+ /* No Bus Divider active */
+ gd->bus_clk = gd->cpu_clk;
+ } else {
+ /* CLKOUT is GCLK / 2 */
+ gd->bus_clk = gd->cpu_clk / 2;
+ }
+ return (0);
+}