3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #include <asm/inca-ip.h>
28 /*******************************************************************************
30 * get_cpuclk - returns the frequency of the CPU.
32 * Gets the value directly from the INCA-IP hardware.
35 * 150.000.000 for 150 MHz
36 * 130.000.000. for 130 Mhz
37 * 100.000.000. for 100 Mhz
39 * This functions should be used by the hardware driver to get the correct
40 * frequency of the CPU. Don't use the macros, which are set to init the CPU
41 * frequency in the ROM code.
43 uint incaip_get_cpuclk(void)
45 /*-------------------------------------------------------------------------*/
46 /* CPU Clock Input Multiplexer (MUX I) */
47 /* Multiplexer MUX I selects the maximum input clock to the CPU. */
48 /*-------------------------------------------------------------------------*/
49 if (*((volatile ulong*)INCA_IP_CGU_CGU_MUXCR) & INCA_IP_CGU_CGU_MUXCR_MUXI)
51 /* MUX I set to 150 MHz clock */
56 /* MUX I set to 100/133 MHz clock */
57 if (*((volatile ulong*)INCA_IP_CGU_CGU_DIVCR) & 0x40)
59 /* Division value is 1/3, maximum CPU operating */
60 /* frequency is 133.3 MHz */
65 /* Division value is 1/4, maximum CPU operating */
66 /* frequency is 100 MHz */
72 /*******************************************************************************
74 * get_fpiclk - returns the frequency of the FPI bus.
76 * Gets the value directly from the INCA-IP hardware.
78 * RETURNS: Frquency in Hz
81 * This functions should be used by the hardware driver to get the correct
82 * frequency of the CPU. Don't use the macros, which are set to init the CPU
83 * frequency in the ROM code.
84 * The calculation for the
86 uint incaip_get_fpiclk(void)
90 clkCPU = incaip_get_cpuclk();
92 switch (*((volatile ulong*)INCA_IP_CGU_CGU_DIVCR) & 0xC)
95 return clkCPU >> 1; /* devided by 2 */
98 return clkCPU >> 2; /* devided by 4 */