* Add support for MIPS32 4Kc CPUs

* Add support for INCA-IP Board

1 files changed, 107 insertions, 0 deletions

diff --git a/cpu/mips/incaip_clock.c b/cpu/mips/incaip_clock.c
new file mode 100644
index 0000000..7fc6eb0
--- /dev/null
+++ b/cpu/mips/incaip_clock.c
@@ -0,0 +1,107 @@
+/*
+ * (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
+*          130.000.000. for 130 Mhz
+*          100.000.000. for 100 Mhz
+* 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 130000000;
+      }
+      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;
+   }
+}
+
+