[deliverable/linux.git] / arch / m68k / platform / 68328 / timers.c

/***************************************************************************/

/*
 *  linux/arch/m68knommu/platform/68328/timers.c
 *
 *  Copyright (C) 1993 Hamish Macdonald
 *  Copyright (C) 1999 D. Jeff Dionne
 *  Copyright (C) 2001 Georges Menie, Ken Desmet
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

/***************************************************************************/

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/clocksource.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/MC68VZ328.h>

/***************************************************************************/

#if defined(CONFIG_DRAGEN2)
/* with a 33.16 MHz clock, this will give usec resolution to the time functions */
#define CLOCK_SOURCE	TCTL_CLKSOURCE_SYSCLK
#define CLOCK_PRE	7
#define TICKS_PER_JIFFY	41450

#elif defined(CONFIG_XCOPILOT_BUGS)
/*
 * The only thing I know is that CLK32 is not available on Xcopilot
 * I have little idea about what frequency SYSCLK has on Xcopilot.
 * The values for prescaler and compare registers were simply
 * taken from the original source
 */
#define CLOCK_SOURCE	TCTL_CLKSOURCE_SYSCLK
#define CLOCK_PRE	2
#define TICKS_PER_JIFFY	0xd7e4

#else
/* default to using the 32Khz clock */
#define CLOCK_SOURCE	TCTL_CLKSOURCE_32KHZ
#define CLOCK_PRE	31
#define TICKS_PER_JIFFY	10
#endif

static u32 m68328_tick_cnt;

/***************************************************************************/

static irqreturn_t hw_tick(int irq, void *dummy)
{
	/* Reset Timer1 */
	TSTAT &= 0;

	m68328_tick_cnt += TICKS_PER_JIFFY;
	return arch_timer_interrupt(irq, dummy);
}

/***************************************************************************/

static struct irqaction m68328_timer_irq = {
	.name	 = "timer",
	.flags	 = IRQF_DISABLED | IRQF_TIMER,
	.handler = hw_tick,
};

/***************************************************************************/

static cycle_t m68328_read_clk(struct clocksource *cs)
{
	unsigned long flags;
	u32 cycles;

	local_irq_save(flags);
	cycles = m68328_tick_cnt + TCN;
	local_irq_restore(flags);

	return cycles;
}

/***************************************************************************/

static struct clocksource m68328_clk = {
	.name	= "timer",
	.rating	= 250,
	.read	= m68328_read_clk,
	.shift	= 20,
	.mask	= CLOCKSOURCE_MASK(32),
	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
};

/***************************************************************************/

void hw_timer_init(void)
{
	/* disable timer 1 */
	TCTL = 0;

	/* set ISR */
	setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);

	/* Restart mode, Enable int, Set clock source */
	TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
	TPRER = CLOCK_PRE;
	TCMP = TICKS_PER_JIFFY;

	/* Enable timer 1 */
	TCTL |= TCTL_TEN;
	m68328_clk.mult = clocksource_hz2mult(TICKS_PER_JIFFY*HZ, m68328_clk.shift);
	clocksource_register(&m68328_clk);
}

/***************************************************************************/

void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
{
	long now = RTCTIME;

	*year = *mon = *day = 1;
	*hour = (now >> 24) % 24;
	*min = (now >> 16) % 60;
	*sec = now % 60;
}

/***************************************************************************/
Commit	Line	Data
75003c48 GU	1	/***************************************************************************/
	2
	3	/*
	4	* linux/arch/m68knommu/platform/68328/timers.c
	5	*
	6	* Copyright (C) 1993 Hamish Macdonald
	7	* Copyright (C) 1999 D. Jeff Dionne
	8	* Copyright (C) 2001 Georges Menie, Ken Desmet
	9	*
	10	* This file is subject to the terms and conditions of the GNU General Public
	11	* License. See the file COPYING in the main directory of this archive
	12	* for more details.
	13	*/
	14
	15	/***************************************************************************/
	16
75003c48 GU	17	#include <linux/types.h>
	18	#include <linux/kernel.h>
	19	#include <linux/mm.h>
1ea9acc7	20	#include <linux/interrupt.h>
be03e56b	21	#include <linux/irq.h>
36a90f26	22	#include <linux/clocksource.h>
75003c48 GU	23	#include <asm/setup.h>
	24	#include <asm/system.h>
	25	#include <asm/pgtable.h>
75003c48 GU	26	#include <asm/machdep.h>
	27	#include <asm/MC68VZ328.h>
	28
	29	/***************************************************************************/
	30
	31	#if defined(CONFIG_DRAGEN2)
	32	/* with a 33.16 MHz clock, this will give usec resolution to the time functions */
	33	#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
	34	#define CLOCK_PRE 7
	35	#define TICKS_PER_JIFFY 41450
	36
	37	#elif defined(CONFIG_XCOPILOT_BUGS)
	38	/*
	39	* The only thing I know is that CLK32 is not available on Xcopilot
	40	* I have little idea about what frequency SYSCLK has on Xcopilot.
	41	* The values for prescaler and compare registers were simply
	42	* taken from the original source
	43	*/
	44	#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
	45	#define CLOCK_PRE 2
	46	#define TICKS_PER_JIFFY 0xd7e4
	47
	48	#else
	49	/* default to using the 32Khz clock */
	50	#define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ
	51	#define CLOCK_PRE 31
	52	#define TICKS_PER_JIFFY 10
	53	#endif
	54
36a90f26 GU	55	static u32 m68328_tick_cnt;
	56
	57	/***************************************************************************/
	58
	59	static irqreturn_t hw_tick(int irq, void *dummy)
	60	{
	61	/* Reset Timer1 */
	62	TSTAT &= 0;
	63
	64	m68328_tick_cnt += TICKS_PER_JIFFY;
	65	return arch_timer_interrupt(irq, dummy);
	66	}
	67
75003c48 GU	68	/***************************************************************************/
75003c48 GU	69
be03e56b	70	static struct irqaction m68328_timer_irq = {
84675716 GU	71	.name = "timer",
	72	.flags = IRQF_DISABLED \| IRQF_TIMER,
	73	.handler = hw_tick,
be03e56b GU	74	};
be03e56b GU	75
36a90f26 GU	76	/***************************************************************************/
36a90f26 GU	77
8e19608e	78	static cycle_t m68328_read_clk(struct clocksource *cs)
36a90f26 GU	79	{
	80	unsigned long flags;
	81	u32 cycles;
	82
	83	local_irq_save(flags);
	84	cycles = m68328_tick_cnt + TCN;
	85	local_irq_restore(flags);
	86
	87	return cycles;
	88	}
	89
	90	/***************************************************************************/
	91
	92	static struct clocksource m68328_clk = {
	93	.name = "timer",
	94	.rating = 250,
	95	.read = m68328_read_clk,
	96	.shift = 20,
	97	.mask = CLOCKSOURCE_MASK(32),
	98	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
	99	};
	100
	101	/***************************************************************************/
	102
84675716	103	void hw_timer_init(void)
75003c48 GU	104	{
	105	/* disable timer 1 */
	106	TCTL = 0;
	107
	108	/* set ISR */
be03e56b	109	setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);
75003c48 GU	110
	111	/* Restart mode, Enable int, Set clock source */
	112	TCTL = TCTL_OM \| TCTL_IRQEN \| CLOCK_SOURCE;
	113	TPRER = CLOCK_PRE;
	114	TCMP = TICKS_PER_JIFFY;
	115
	116	/* Enable timer 1 */
	117	TCTL \|= TCTL_TEN;
36a90f26 GU	118	m68328_clk.mult = clocksource_hz2mult(TICKS_PER_JIFFY*HZ, m68328_clk.shift);
36a90f26 GU	119	clocksource_register(&m68328_clk);
75003c48 GU	120	}
	121
	122	/***************************************************************************/
	123
	124	void m68328_timer_gettod(int year, int mon, int day, int hour, int min, int sec)
	125	{
	126	long now = RTCTIME;
	127
	128	year = mon = *day = 1;
	129	*hour = (now >> 24) % 24;
	130	*min = (now >> 16) % 60;
	131	*sec = now % 60;
	132	}
	133
	134	/***************************************************************************/