[deliverable/linux.git] / arch / m68k / 68000 / timers.c

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

/*
 *  timers.c - Generic hardware timer support.
 *
 *  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 <linux/rtc.h>
#include <asm/setup.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 irq_handler_t timer_interrupt;

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

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

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

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

static struct irqaction m68328_timer_irq = {
	.name	 = "timer",
	.flags	 = 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,
	.mask	= CLOCKSOURCE_MASK(32),
	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
};

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

void hw_timer_init(irq_handler_t handler)
{
	/* 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;
	clocksource_register_hz(&m68328_clk, TICKS_PER_JIFFY*HZ);
	timer_interrupt = handler;
}

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

int m68328_hwclk(int set, struct rtc_time *t)
{
	if (!set) {
		long now = RTCTIME;
		t->tm_year = t->tm_mon = t->tm_mday = 1;
		t->tm_hour = (now >> 24) % 24;
		t->tm_min = (now >> 16) % 60;
		t->tm_sec = now % 60;
	}

	return 0;
}

/***************************************************************************/
Commit	Line	Data
	1	/***************************************************************************/
	2
	3	/*
	4	* timers.c - Generic hardware timer support.
	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
	17	#include <linux/types.h>
	18	#include <linux/kernel.h>
	19	#include <linux/mm.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/irq.h>
	22	#include <linux/clocksource.h>
	23	#include <linux/rtc.h>
	24	#include <asm/setup.h>
	25	#include <asm/pgtable.h>
	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
	55	static u32 m68328_tick_cnt;
	56	static irq_handler_t timer_interrupt;
	57
	58	/***************************************************************************/
	59
	60	static irqreturn_t hw_tick(int irq, void *dummy)
	61	{
	62	/* Reset Timer1 */
	63	TSTAT &= 0;
	64
	65	m68328_tick_cnt += TICKS_PER_JIFFY;
	66	return timer_interrupt(irq, dummy);
	67	}
	68
	69	/***************************************************************************/
	70
	71	static struct irqaction m68328_timer_irq = {
	72	.name = "timer",
	73	.flags = IRQF_TIMER,
	74	.handler = hw_tick,
	75	};
	76
	77	/***************************************************************************/
	78
	79	static cycle_t m68328_read_clk(struct clocksource *cs)
	80	{
	81	unsigned long flags;
	82	u32 cycles;
	83
	84	local_irq_save(flags);
	85	cycles = m68328_tick_cnt + TCN;
	86	local_irq_restore(flags);
	87
	88	return cycles;
	89	}
	90
	91	/***************************************************************************/
	92
	93	static struct clocksource m68328_clk = {
	94	.name = "timer",
	95	.rating = 250,
	96	.read = m68328_read_clk,
	97	.mask = CLOCKSOURCE_MASK(32),
	98	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
	99	};
	100
	101	/***************************************************************************/
	102
	103	void hw_timer_init(irq_handler_t handler)
	104	{
	105	/* disable timer 1 */
	106	TCTL = 0;
	107
	108	/* set ISR */
	109	setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);
	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;
	118	clocksource_register_hz(&m68328_clk, TICKS_PER_JIFFY*HZ);
	119	timer_interrupt = handler;
	120	}
	121
	122	/***************************************************************************/
	123
	124	int m68328_hwclk(int set, struct rtc_time *t)
	125	{
	126	if (!set) {
	127	long now = RTCTIME;
	128	t->tm_year = t->tm_mon = t->tm_mday = 1;
	129	t->tm_hour = (now >> 24) % 24;
	130	t->tm_min = (now >> 16) % 60;
	131	t->tm_sec = now % 60;
	132	}
	133
	134	return 0;
	135	}
	136
	137	/***************************************************************************/