| wdenk | 42d1f03 | 2003-10-15 23:53:47 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * (C) Copyright 2003 Motorola Inc. |
| 3 | * Xianghua Xiao, (X.Xiao@motorola.com) |
| 4 | * |
| 5 | * (C) Copyright 2000 |
| 6 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 7 | * |
| 8 | * See file CREDITS for list of people who contributed to this |
| 9 | * project. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation; either version 2 of |
| 14 | * the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 24 | * MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #include <common.h> |
| 28 | #include <ppc_asm.tmpl> |
| 29 | #include <asm/processor.h> |
| 30 | |
| 31 | /* --------------------------------------------------------------- */ |
| 32 | |
| 33 | #define ONE_BILLION 1000000000 |
| 34 | |
| 35 | void get_sys_info (sys_info_t * sysInfo) |
| 36 | { |
| 37 | volatile immap_t *immap = (immap_t *)CFG_IMMR; |
| 38 | volatile ccsr_gur_t *gur = &immap->im_gur; |
| 39 | uint plat_ratio,e500_ratio; |
| 40 | |
| 41 | plat_ratio = (gur->porpllsr) & 0x0000003e; |
| 42 | plat_ratio >>= 1; |
| 43 | switch(plat_ratio) { |
| 44 | case 0x02: |
| 45 | case 0x03: |
| 46 | case 0x04: |
| 47 | case 0x05: |
| 48 | case 0x06: |
| 49 | case 0x08: |
| 50 | case 0x09: |
| 51 | case 0x0a: |
| 52 | case 0x0c: |
| 53 | case 0x10: |
| 54 | sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ; |
| 55 | break; |
| 56 | default: |
| 57 | sysInfo->freqSystemBus = 0; |
| 58 | break; |
| 59 | } |
| 60 | |
| 61 | e500_ratio = (gur->porpllsr) & 0x003f0000; |
| 62 | e500_ratio >>= 16; |
| 63 | switch(e500_ratio) { |
| 64 | case 0x04: |
| 65 | sysInfo->freqProcessor = 2*sysInfo->freqSystemBus; |
| 66 | break; |
| 67 | case 0x05: |
| 68 | sysInfo->freqProcessor = 5*sysInfo->freqSystemBus/2; |
| 69 | break; |
| 70 | case 0x06: |
| 71 | sysInfo->freqProcessor = 3*sysInfo->freqSystemBus; |
| 72 | break; |
| 73 | case 0x07: |
| 74 | sysInfo->freqProcessor = 7*sysInfo->freqSystemBus/2; |
| 75 | break; |
| 76 | default: |
| 77 | sysInfo->freqProcessor = 0; |
| 78 | break; |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | int get_clocks (void) |
| 83 | { |
| 84 | DECLARE_GLOBAL_DATA_PTR; |
| 85 | sys_info_t sys_info; |
| 86 | #if defined(CONFIG_MPC8560) |
| 87 | volatile immap_t *immap = (immap_t *) CFG_IMMR; |
| 88 | uint sccr, dfbrg; |
| 89 | |
| 90 | /* set VCO = 4 * BRG */ |
| 91 | immap->im_cpm.im_cpm_intctl.sccr &= 0xfffffffc; |
| 92 | sccr = immap->im_cpm.im_cpm_intctl.sccr; |
| 93 | dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT; |
| 94 | #endif |
| 95 | get_sys_info (&sys_info); |
| 96 | gd->cpu_clk = sys_info.freqProcessor; |
| 97 | gd->bus_clk = sys_info.freqSystemBus; |
| 98 | #if defined(CONFIG_MPC8560) |
| 99 | gd->vco_out = 2*sys_info.freqSystemBus; |
| 100 | gd->cpm_clk = gd->vco_out / 2; |
| 101 | gd->scc_clk = gd->vco_out / 4; |
| 102 | gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1))); |
| 103 | #endif |
| 104 | |
| 105 | if(gd->cpu_clk != 0) return (0); |
| 106 | else return (1); |
| 107 | } |
| 108 | |
| 109 | |
| 110 | /******************************************** |
| 111 | * get_bus_freq |
| 112 | * return system bus freq in Hz |
| 113 | *********************************************/ |
| 114 | ulong get_bus_freq (ulong dummy) |
| 115 | { |
| 116 | ulong val; |
| 117 | |
| 118 | sys_info_t sys_info; |
| 119 | |
| 120 | get_sys_info (&sys_info); |
| 121 | val = sys_info.freqSystemBus; |
| 122 | |
| 123 | return val; |
| 124 | } |