[people/ms/u-boot.git] / lib_sh / time.c

/*
 * (C) Copyright 2007-2008
 * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
 *
 * (C) Copyright 2003
 * 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 <asm/processor.h>
#include <asm/io.h>

#define TMU_MAX_COUNTER (~0UL)
static int clk_adj = 1;

static void tmu_timer_start (unsigned int timer)
{
	if (timer > 2)
		return;
	writeb(readb(TSTR) | (1 << timer), TSTR);
}

static void tmu_timer_stop (unsigned int timer)
{
	if (timer > 2)
		return;
	writeb(readb(TSTR) & ~(1 << timer), TSTR);
}

int timer_init (void)
{
	/* Divide clock by TMU_CLK_DIVIDER */
	u16 bit = 0;

	switch (TMU_CLK_DIVIDER) {
	case 1024:
		bit = 4;
		break;
	case 256:
		bit = 3;
		break;
	case 64:
		bit = 2;
		break;
	case 16:
		bit = 1;
		break;
	case 4:
	default:
		bit = 0;
		break;
	}
	writew(readw(TCR0) | bit, TCR0);

	/* Clock adjustment calc */
	clk_adj = (int)(1.0 / ((1.0 / CONFIG_SYS_HZ) * 1000000));
	if (clk_adj < 1)
		clk_adj = 1;

	tmu_timer_stop(0);
	tmu_timer_start(0);

	return 0;
}

unsigned long long get_ticks (void)
{
	return 0 - readl(TCNT0);
}

static unsigned long get_usec (void)
{
	return (0 - readl(TCNT0));
}

void udelay (unsigned long usec)
{
	unsigned int start = get_usec();
	unsigned int end = start + (usec * clk_adj);

	while (get_usec() < end)
		continue;
}

unsigned long get_timer (unsigned long base)
{
	/* return msec */
	return ((get_usec() / clk_adj) / 1000) - base;
}

void set_timer (unsigned long t)
{
	writel((0 - t), TCNT0);
}

void reset_timer (void)
{
	tmu_timer_stop(0);
	set_timer (0);
	tmu_timer_start(0);
}

unsigned long get_tbclk (void)
{
	return CONFIG_SYS_HZ;
}
Commit	Line	Data
0b135cfc	1	/*
e9d5f354 NI	2	* (C) Copyright 2007-2008
	3	* Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
	4	*
	5	* (C) Copyright 2003
	6	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
0b135cfc NI	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>
9e23fe05	28	#include <asm/processor.h>
e9d5f354 NI	29	#include <asm/io.h>
	30
	31	#define TMU_MAX_COUNTER (~0UL)
	32	static int clk_adj = 1;
0b135cfc NI	33
	34	static void tmu_timer_start (unsigned int timer)
	35	{
	36	if (timer > 2)
	37	return;
e9d5f354 NI	38	writeb(readb(TSTR) \| (1 << timer), TSTR);
e9d5f354 NI	39	}
0b135cfc	40
e9d5f354 NI	41	static void tmu_timer_stop (unsigned int timer)
	42	{
	43	if (timer > 2)
	44	return;
	45	writeb(readb(TSTR) & ~(1 << timer), TSTR);
0b135cfc NI	46	}
	47
	48	int timer_init (void)
	49	{
e9d5f354 NI	50	/* Divide clock by TMU_CLK_DIVIDER */
e9d5f354 NI	51	u16 bit = 0;
1e15ff99 JCPV	52
	53	switch (TMU_CLK_DIVIDER) {
	54	case 1024:
	55	bit = 4;
e9d5f354 NI	56	break;
	57	case 256:
	58	bit = 3;
	59	break;
1e15ff99 JCPV	60	case 64:
1e15ff99 JCPV	61	bit = 2;
e9d5f354	62	break;
1e15ff99 JCPV	63	case 16:
	64	bit = 1;
	65	break;
	66	case 4:
e9d5f354 NI	67	default:
	68	bit = 0;
	69	break;
	70	}
	71	writew(readw(TCR0) \| bit, TCR0);
	72
	73	/* Clock adjustment calc */
1e15ff99	74	clk_adj = (int)(1.0 / ((1.0 / CONFIG_SYS_HZ) * 1000000));
e9d5f354 NI	75	if (clk_adj < 1)
	76	clk_adj = 1;
	77
	78	tmu_timer_stop(0);
	79	tmu_timer_start(0);
0b135cfc	80
0b135cfc NI	81	return 0;
	82	}
	83
	84	unsigned long long get_ticks (void)
	85	{
e9d5f354	86	return 0 - readl(TCNT0);
0b135cfc NI	87	}
0b135cfc NI	88
e9d5f354	89	static unsigned long get_usec (void)
0b135cfc	90	{
e9d5f354	91	return (0 - readl(TCNT0));
0b135cfc NI	92	}
0b135cfc NI	93
e9d5f354	94	void udelay (unsigned long usec)
0b135cfc	95	{
e9d5f354 NI	96	unsigned int start = get_usec();
	97	unsigned int end = start + (usec * clk_adj);
	98
	99	while (get_usec() < end)
	100	continue;
0b135cfc NI	101	}
0b135cfc NI	102
e9d5f354	103	unsigned long get_timer (unsigned long base)
0b135cfc	104	{
1e15ff99 JCPV	105	/* return msec */
1e15ff99 JCPV	106	return ((get_usec() / clk_adj) / 1000) - base;
0b135cfc NI	107	}
0b135cfc NI	108
e9d5f354	109	void set_timer (unsigned long t)
0b135cfc	110	{
e9d5f354 NI	111	writel((0 - t), TCNT0);
e9d5f354 NI	112	}
0b135cfc	113
e9d5f354 NI	114	void reset_timer (void)
	115	{
	116	tmu_timer_stop(0);
	117	set_timer (0);
	118	tmu_timer_start(0);
0b135cfc NI	119	}
	120
	121	unsigned long get_tbclk (void)
	122	{
6d0f6bcf	123	return CONFIG_SYS_HZ;
0b135cfc	124	}