speed.c
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/*
* Copyright 2004 Freescale Semiconductor.
* Jeff Brown
* Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <mpc86xx.h>
#include <asm/processor.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
/* used in some defintiions of CONFIG_SYS_CLK_FREQ */
extern unsigned long get_board_sys_clk(unsigned long dummy);
void get_sys_info(sys_info_t *sys_info)
{
volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
volatile ccsr_gur_t *gur = &immap->im_gur;
uint plat_ratio, e600_ratio;
plat_ratio = (gur->porpllsr) & 0x0000003e;
plat_ratio >>= 1;
switch (plat_ratio) {
case 0x0:
sys_info->freq_systembus = 16 * CONFIG_SYS_CLK_FREQ;
break;
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x08:
case 0x09:
case 0x0a:
case 0x0c:
case 0x10:
sys_info->freq_systembus = plat_ratio * CONFIG_SYS_CLK_FREQ;
break;
default:
sys_info->freq_systembus = 0;
break;
}
e600_ratio = (gur->porpllsr) & 0x003f0000;
e600_ratio >>= 16;
switch (e600_ratio) {
case 0x10:
sys_info->freq_processor = 2 * sys_info->freq_systembus;
break;
case 0x19:
sys_info->freq_processor = 5 * sys_info->freq_systembus / 2;
break;
case 0x20:
sys_info->freq_processor = 3 * sys_info->freq_systembus;
break;
case 0x39:
sys_info->freq_processor = 7 * sys_info->freq_systembus / 2;
break;
case 0x28:
sys_info->freq_processor = 4 * sys_info->freq_systembus;
break;
case 0x1d:
sys_info->freq_processor = 9 * sys_info->freq_systembus / 2;
break;
default:
sys_info->freq_processor = e600_ratio +
sys_info->freq_systembus;
break;
}
sys_info->freq_localbus = sys_info->freq_systembus;
}
/*
* Measure CPU clock speed (core clock GCLK1, GCLK2)
* (Approx. GCLK frequency in Hz)
*/
int get_clocks(void)
{
sys_info_t sys_info;
get_sys_info(&sys_info);
gd->cpu_clk = sys_info.freq_processor;
gd->bus_clk = sys_info.freq_systembus;
gd->arch.lbc_clk = sys_info.freq_localbus;
/*
* The base clock for I2C depends on the actual SOC. Unfortunately,
* there is no pattern that can be used to determine the frequency, so
* the only choice is to look up the actual SOC number and use the value
* for that SOC. This information is taken from application note
* AN2919.
*/
#ifdef CONFIG_ARCH_MPC8610
gd->arch.i2c1_clk = sys_info.freq_systembus;
#else
gd->arch.i2c1_clk = sys_info.freq_systembus / 2;
#endif
gd->arch.i2c2_clk = gd->arch.i2c1_clk;
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.freq_systembus;
return val;
}