1 files changed, 116 insertions, 0 deletions
diff --git a/arch/mips/cpu/mips32/incaip/incaip_clock.c b/arch/mips/cpu/mips32/incaip/incaip_clock.c
new file mode 100644
index 0000000..b65dfe0
--- /dev/null
+++ b/arch/mips/cpu/mips32/incaip/incaip_clock.c
@@ -0,0 +1,116 @@
+/*
+ * (C) Copyright 2003
+ * 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 <asm/inca-ip.h>
+
+
+/*******************************************************************************
+*
+* get_cpuclk - returns the frequency of the CPU.
+*
+* Gets the value directly from the INCA-IP hardware.
+*
+* RETURNS:
+*          150.000.000 for 150 MHz
+*          133.333.333 for 133 MHz (= 400MHz/3)
+*          100.000.000 for 100 MHz (= 400MHz/4)
+* NOTE:
+*   This functions should be used by the hardware driver to get the correct
+*   frequency of the CPU. Don't use the macros, which are set to init the CPU
+*   frequency in the ROM code.
+*/
+uint incaip_get_cpuclk (void)
+{
+	/*-------------------------------------------------------------------------*/
+	/* CPU Clock Input Multiplexer (MUX I)                                     */
+	/* Multiplexer MUX I selects the maximum input clock to the CPU.           */
+	/*-------------------------------------------------------------------------*/
+	if (*((volatile ulong *) INCA_IP_CGU_CGU_MUXCR) &
+	    INCA_IP_CGU_CGU_MUXCR_MUXI) {
+		/* MUX I set to 150 MHz clock */
+		return 150000000;
+	} else {
+		/* MUX I set to 100/133 MHz clock */
+		if (*((volatile ulong *) INCA_IP_CGU_CGU_DIVCR) & 0x40) {
+			/* Division value is 1/3, maximum CPU operating */
+			/* frequency is 133.3 MHz                       */
+			return 133333333;
+		} else {
+			/* Division value is 1/4, maximum CPU operating */
+			/* frequency is 100 MHz                         */
+			return 100000000;
+		}
+	}
+}
+
+/*******************************************************************************
+*
+* get_fpiclk - returns the frequency of the FPI bus.
+*
+* Gets the value directly from the INCA-IP hardware.
+*
+* RETURNS: Frquency in Hz
+*
+* NOTE:
+*   This functions should be used by the hardware driver to get the correct
+*   frequency of the CPU. Don't use the macros, which are set to init the CPU
+*   frequency in the ROM code.
+*   The calculation for the
+*/
+uint incaip_get_fpiclk (void)
+{
+	uint clkCPU;
+
+	clkCPU = incaip_get_cpuclk ();
+
+	switch (*((volatile ulong *) INCA_IP_CGU_CGU_DIVCR) & 0xC) {
+	case 0x4:
+		return clkCPU >> 1;	/* devided by 2 */
+		break;
+	case 0x8:
+		return clkCPU >> 2;	/* devided by 4 */
+		break;
+	default:
+		return clkCPU;
+		break;
+	}
+}
+
+int incaip_set_cpuclk (void)
+{
+	extern void ebu_init(long);
+	extern void cgu_init(long);
+	extern void sdram_init(long);
+	char tmp[64];
+	ulong cpuclk;
+
+	if (getenv_f("cpuclk", tmp, sizeof (tmp)) > 0) {
+		cpuclk = simple_strtoul (tmp, NULL, 10) * 1000000;
+		cgu_init (cpuclk);
+		ebu_init (cpuclk);
+		sdram_init (cpuclk);
+	}
+
+	return 0;
+}