| /* |
| * (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; |
| } |