1 files changed, 83 insertions, 0 deletions
diff --git a/cpu/lh7a40x/speed.c b/cpu/lh7a40x/speed.c
new file mode 100644
index 0000000..e80b046
--- /dev/null
+++ b/cpu/lh7a40x/speed.c
@@ -0,0 +1,83 @@
+/*
+ * (C) Copyright 2001-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2002
+ * David Mueller, ELSOFT AG, d.mueller@elsoft.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, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <lh7a40x.h>
+
+
+/* ------------------------------------------------------------------------- */
+/* NOTE: This describes the proper use of this file.
+ *
+ * CONFIG_SYS_CLK_FREQ should be defined as the input frequency of the PLL.
+ *
+ * get_FCLK(), get_HCLK(), get_PCLK() return the clock of
+ * the specified bus in HZ.
+ */
+/* ------------------------------------------------------------------------- */
+
+ulong get_PLLCLK (void)
+{
+	return CONFIG_SYS_CLK_FREQ;
+}
+
+/* return FCLK frequency */
+ulong get_FCLK (void)
+{
+	LH7A40X_CSC_PTR (csc);
+	ulong maindiv1, maindiv2, prediv, ps;
+
+	/*
+	 * from userguide 6.1.1.2
+	 *
+	 * FCLK = ((MAINDIV1 +2) * (MAINDIV2 +2) * 14.7456MHz) /
+	 *                   ((PREDIV+2) * (2^PS))
+	 */
+	maindiv2 = (csc->clkset & CLKSET_MAINDIV2) >> 11;
+	maindiv1 = (csc->clkset & CLKSET_MAINDIV1) >> 7;
+	prediv = (csc->clkset & CLKSET_PREDIV) >> 2;
+	ps = (csc->clkset & CLKSET_PS) >> 16;
+
+	return (((maindiv2 + 2) * (maindiv1 + 2) * CONFIG_SYS_CLK_FREQ) /
+		((prediv + 2) * (1 << ps)));
+}
+
+
+/* return HCLK frequency */
+ulong get_HCLK (void)
+{
+	LH7A40X_CSC_PTR (csc);
+
+	return (get_FCLK () / ((csc->clkset & CLKSET_HCLKDIV) + 1));
+}
+
+/* return PCLK frequency */
+ulong get_PCLK (void)
+{
+	LH7A40X_CSC_PTR (csc);
+
+	return (get_HCLK () /
+		(1 << (((csc->clkset & CLKSET_PCLKDIV) >> 16) + 1)));
+}