[people/ms/u-boot.git] / arch / powerpc / cpu / mpc5xx / speed.c

/*
 * (C) Copyright 2003
 * Martin Winistoerfer, martinwinistoerfer@gmx.ch.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * File:		speed.c
 *
 * Discription:		Provides cpu speed calculation
 *
 */

#include <common.h>
#include <mpc5xx.h>
#include <asm/processor.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * Get cpu and bus clock
 */
int get_clocks (void)
{
	volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;

#ifndef	CONFIG_5xx_GCLK_FREQ
	uint divf = (immr->im_clkrst.car_plprcr & PLPRCR_DIVF_MSK);
	uint mf = ((immr->im_clkrst.car_plprcr & PLPRCR_MF_MSK) >> PLPRCR_MF_SHIFT);
	ulong vcoout;

	vcoout = (CONFIG_SYS_OSC_CLK / (divf + 1)) * (mf + 1) * 2;
	if(immr->im_clkrst.car_plprcr & PLPRCR_CSRC_MSK) {
		gd->cpu_clk = vcoout / (2^(((immr->im_clkrst.car_sccr & SCCR_DFNL_MSK) >> SCCR_DFNL_SHIFT) + 1));
	} else {
		gd->cpu_clk = vcoout / (2^(immr->im_clkrst.car_sccr & SCCR_DFNH_MSK));
	}

#else /* CONFIG_5xx_GCLK_FREQ */
	gd->bus_clk = CONFIG_5xx_GCLK_FREQ;
#endif /* CONFIG_5xx_GCLK_FREQ */

	if ((immr->im_clkrst.car_sccr & SCCR_EBDF11) == 0) {
		/* No Bus Divider active */
		gd->bus_clk = gd->cpu_clk;
	} else {
		/* CLKOUT is GCLK / 2 */
		gd->bus_clk = gd->cpu_clk / 2;
	}
	return (0);
}
Commit	Line	Data
0db5bca8 WD	1	/*
	2	* (C) Copyright 2003
	3	* Martin Winistoerfer, martinwinistoerfer@gmx.ch.
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
0db5bca8 WD	6	*/
	7
	8	/*
	9	* File: speed.c
8bde7f77	10	*
0db5bca8	11	* Discription: Provides cpu speed calculation
8bde7f77	12	*
0db5bca8 WD	13	*/
	14
	15	#include <common.h>
	16	#include <mpc5xx.h>
	17	#include <asm/processor.h>
	18
d87080b7 WD	19	DECLARE_GLOBAL_DATA_PTR;
d87080b7 WD	20
0db5bca8 WD	21	/*
	22	* Get cpu and bus clock
	23	*/
	24	int get_clocks (void)
	25	{
6d0f6bcf	26	volatile immap_t immr = (immap_t ) CONFIG_SYS_IMMR;
0db5bca8 WD	27
	28	#ifndef CONFIG_5xx_GCLK_FREQ
	29	uint divf = (immr->im_clkrst.car_plprcr & PLPRCR_DIVF_MSK);
	30	uint mf = ((immr->im_clkrst.car_plprcr & PLPRCR_MF_MSK) >> PLPRCR_MF_SHIFT);
	31	ulong vcoout;
	32
6d0f6bcf	33	vcoout = (CONFIG_SYS_OSC_CLK / (divf + 1)) * (mf + 1) * 2;
0db5bca8 WD	34	if(immr->im_clkrst.car_plprcr & PLPRCR_CSRC_MSK) {
	35	gd->cpu_clk = vcoout / (2^(((immr->im_clkrst.car_sccr & SCCR_DFNL_MSK) >> SCCR_DFNL_SHIFT) + 1));
	36	} else {
53677ef1 WD	37	gd->cpu_clk = vcoout / (2^(immr->im_clkrst.car_sccr & SCCR_DFNH_MSK));
53677ef1 WD	38	}
8bde7f77	39
0db5bca8 WD	40	#else /* CONFIG_5xx_GCLK_FREQ */
	41	gd->bus_clk = CONFIG_5xx_GCLK_FREQ;
	42	#endif /* CONFIG_5xx_GCLK_FREQ */
	43
	44	if ((immr->im_clkrst.car_sccr & SCCR_EBDF11) == 0) {
	45	/* No Bus Divider active */
	46	gd->bus_clk = gd->cpu_clk;
	47	} else {
	48	/* CLKOUT is GCLK / 2 */
	49	gd->bus_clk = gd->cpu_clk / 2;
	50	}
	51	return (0);
	52	}