diff options
Diffstat (limited to 'cpu/mpc85xx/speed.c')
| -rw-r--r-- | cpu/mpc85xx/speed.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/cpu/mpc85xx/speed.c b/cpu/mpc85xx/speed.c new file mode 100644 index 0000000..a720cff --- /dev/null +++ b/cpu/mpc85xx/speed.c @@ -0,0 +1,124 @@ +/* + * (C) Copyright 2003 Motorola Inc. + * Xianghua Xiao, (X.Xiao@motorola.com) + * + * (C) Copyright 2000 + * 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 <ppc_asm.tmpl> +#include <asm/processor.h> + +/* --------------------------------------------------------------- */ + +#define ONE_BILLION 1000000000 + +void get_sys_info (sys_info_t * sysInfo) +{ + volatile immap_t *immap = (immap_t *)CFG_IMMR; + volatile ccsr_gur_t *gur = &immap->im_gur; + uint plat_ratio,e500_ratio; + + plat_ratio = (gur->porpllsr) & 0x0000003e; + plat_ratio >>= 1; + switch(plat_ratio) { + case 0x02: + case 0x03: + case 0x04: + case 0x05: + case 0x06: + case 0x08: + case 0x09: + case 0x0a: + case 0x0c: + case 0x10: + sysInfo->freqSystemBus = plat_ratio * CONFIG_SYS_CLK_FREQ; + break; + default: + sysInfo->freqSystemBus = 0; + break; + } + + e500_ratio = (gur->porpllsr) & 0x003f0000; + e500_ratio >>= 16; + switch(e500_ratio) { + case 0x04: + sysInfo->freqProcessor = 2*sysInfo->freqSystemBus; + break; + case 0x05: + sysInfo->freqProcessor = 5*sysInfo->freqSystemBus/2; + break; + case 0x06: + sysInfo->freqProcessor = 3*sysInfo->freqSystemBus; + break; + case 0x07: + sysInfo->freqProcessor = 7*sysInfo->freqSystemBus/2; + break; + default: + sysInfo->freqProcessor = 0; + break; + } +} + +int get_clocks (void) +{ + DECLARE_GLOBAL_DATA_PTR; + sys_info_t sys_info; +#if defined(CONFIG_MPC8560) + volatile immap_t *immap = (immap_t *) CFG_IMMR; + uint sccr, dfbrg; + + /* set VCO = 4 * BRG */ + immap->im_cpm.im_cpm_intctl.sccr &= 0xfffffffc; + sccr = immap->im_cpm.im_cpm_intctl.sccr; + dfbrg = (sccr & SCCR_DFBRG_MSK) >> SCCR_DFBRG_SHIFT; +#endif + get_sys_info (&sys_info); + gd->cpu_clk = sys_info.freqProcessor; + gd->bus_clk = sys_info.freqSystemBus; +#if defined(CONFIG_MPC8560) + gd->vco_out = 2*sys_info.freqSystemBus; + gd->cpm_clk = gd->vco_out / 2; + gd->scc_clk = gd->vco_out / 4; + gd->brg_clk = gd->vco_out / (1 << (2 * (dfbrg + 1))); +#endif + + if(gd->cpu_clk != 0) return (0); + else return (1); +} + + +/******************************************** + * get_bus_freq + * return system bus freq in Hz + *********************************************/ +ulong get_bus_freq (ulong dummy) +{ + ulong val; + + sys_info_t sys_info; + + get_sys_info (&sys_info); + val = sys_info.freqSystemBus; + + return val; +} |