1 /* 2 * Copyright 2008 Extreme Engineering Solutions, Inc. 3 * 4 * See file CREDITS for list of people who contributed to this 5 * project. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of 10 * the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 20 * MA 02111-1307 USA 21 */ 22 23 #include <common.h> 24 25 /* 26 * Return SYSCLK input frequency - 50 MHz or 66 MHz depending on POR config 27 */ 28 unsigned long get_board_sys_clk(ulong dummy) 29 { 30 #if defined(CONFIG_MPC85xx) 31 volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR); 32 #elif defined(CONFIG_MPC86xx) 33 immap_t *immap = (immap_t *)CONFIG_SYS_IMMR; 34 volatile ccsr_gur_t *gur = &immap->im_gur; 35 #endif 36 u32 gpporcr = gur->gpporcr; 37 38 if (gpporcr & 0x10000) 39 return 66666666; 40 else 41 return 50000000; 42 } 43 44 #ifdef CONFIG_MPC85xx 45 /* 46 * Return DDR input clock - synchronous with SYSCLK or 66 MHz 47 * Note: 86xx doesn't support asynchronous DDR clk 48 */ 49 unsigned long get_board_ddr_clk(ulong dummy) 50 { 51 volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR); 52 u32 ddr_ratio = ((gur->porpllsr) & 0x00003e00) >> 9; 53 54 if (ddr_ratio == 0x7) 55 return get_board_sys_clk(dummy); 56 57 return 66666666; 58 } 59 #endif 60