move ifxmips uboot to package/

[openwrt/svn-archive/archive.git] / package / uboot-ifxmips / files / cpu / mips / danube / incaip_clock.c

diff --git a/package/uboot-ifxmips/files/cpu/mips/danube/incaip_clock.c b/package/uboot-ifxmips/files/cpu/mips/danube/incaip_clock.c
new file mode 100644 (file)
index 0000000..1b0a0fd
--- /dev/null
+++ b/package/uboot-ifxmips/files/cpu/mips/danube/incaip_clock.c
@@ -0,0 +1,120 @@
+/*
+ * (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
+ */
+
+#ifdef CONFIG_INCA_IP
+
+#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_r ("cpuclk", tmp, sizeof (tmp)) > 0) {
+               cpuclk = simple_strtoul (tmp, NULL, 10) * 1000000;
+               cgu_init (cpuclk);
+               ebu_init (cpuclk);
+               sdram_init (cpuclk);
+       }
+
+       return 0;
+}
+
+#endif /* CONFIG_INCA_IP */