[deliverable/linux.git] / arch / arm / mach-davinci / time.c

/*
 * DaVinci timer subsystem
 *
 * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
 *
 * 2007 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/platform_device.h>

#include <mach/hardware.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#include <asm/errno.h>
#include <mach/io.h>
#include <mach/cputype.h>
#include <mach/time.h>
#include "clock.h"

static struct clock_event_device clockevent_davinci;
static unsigned int davinci_clock_tick_rate;

/*
 * This driver configures the 2 64-bit count-up timers as 4 independent
 * 32-bit count-up timers used as follows:
 */

enum {
	TID_CLOCKEVENT,
	TID_CLOCKSOURCE,
};

/* Timer register offsets */
#define PID12			0x0
#define TIM12			0x10
#define TIM34			0x14
#define PRD12			0x18
#define PRD34			0x1c
#define TCR			0x20
#define TGCR			0x24
#define WDTCR			0x28

/* Offsets of the 8 compare registers */
#define	CMP12_0			0x60
#define	CMP12_1			0x64
#define	CMP12_2			0x68
#define	CMP12_3			0x6c
#define	CMP12_4			0x70
#define	CMP12_5			0x74
#define	CMP12_6			0x78
#define	CMP12_7			0x7c

/* Timer register bitfields */
#define TCR_ENAMODE_DISABLE          0x0
#define TCR_ENAMODE_ONESHOT          0x1
#define TCR_ENAMODE_PERIODIC         0x2
#define TCR_ENAMODE_MASK             0x3

#define TGCR_TIMMODE_SHIFT           2
#define TGCR_TIMMODE_64BIT_GP        0x0
#define TGCR_TIMMODE_32BIT_UNCHAINED 0x1
#define TGCR_TIMMODE_64BIT_WDOG      0x2
#define TGCR_TIMMODE_32BIT_CHAINED   0x3

#define TGCR_TIM12RS_SHIFT           0
#define TGCR_TIM34RS_SHIFT           1
#define TGCR_RESET                   0x0
#define TGCR_UNRESET                 0x1
#define TGCR_RESET_MASK              0x3

#define WDTCR_WDEN_SHIFT             14
#define WDTCR_WDEN_DISABLE           0x0
#define WDTCR_WDEN_ENABLE            0x1
#define WDTCR_WDKEY_SHIFT            16
#define WDTCR_WDKEY_SEQ0             0xa5c6
#define WDTCR_WDKEY_SEQ1             0xda7e

struct timer_s {
	char *name;
	unsigned int id;
	unsigned long period;
	unsigned long opts;
	unsigned long flags;
	void __iomem *base;
	unsigned long tim_off;
	unsigned long prd_off;
	unsigned long enamode_shift;
	struct irqaction irqaction;
};
static struct timer_s timers[];

/* values for 'opts' field of struct timer_s */
#define TIMER_OPTS_DISABLED		0x01
#define TIMER_OPTS_ONESHOT		0x02
#define TIMER_OPTS_PERIODIC		0x04
#define TIMER_OPTS_STATE_MASK		0x07

#define TIMER_OPTS_USE_COMPARE		0x80000000
#define USING_COMPARE(t)		((t)->opts & TIMER_OPTS_USE_COMPARE)

static char *id_to_name[] = {
	[T0_BOT]	= "timer0_0",
	[T0_TOP]	= "timer0_1",
	[T1_BOT]	= "timer1_0",
	[T1_TOP]	= "timer1_1",
};

static int timer32_config(struct timer_s *t)
{
	u32 tcr;
	struct davinci_soc_info *soc_info = davinci_get_soc_info();

	if (USING_COMPARE(t)) {
		struct davinci_timer_instance *dtip =
				soc_info->timer_info->timers;
		int event_timer = ID_TO_TIMER(timers[TID_CLOCKEVENT].id);

		/*
		 * Next interrupt should be the current time reg value plus
		 * the new period (using 32-bit unsigned addition/wrapping
		 * to 0 on overflow).  This assumes that the clocksource
		 * is setup to count to 2^32-1 before wrapping around to 0.
		 */
		__raw_writel(__raw_readl(t->base + t->tim_off) + t->period,
			t->base + dtip[event_timer].cmp_off);
	} else {
		tcr = __raw_readl(t->base + TCR);

		/* disable timer */
		tcr &= ~(TCR_ENAMODE_MASK << t->enamode_shift);
		__raw_writel(tcr, t->base + TCR);

		/* reset counter to zero, set new period */
		__raw_writel(0, t->base + t->tim_off);
		__raw_writel(t->period, t->base + t->prd_off);

		/* Set enable mode */
		if (t->opts & TIMER_OPTS_ONESHOT)
			tcr |= TCR_ENAMODE_ONESHOT << t->enamode_shift;
		else if (t->opts & TIMER_OPTS_PERIODIC)
			tcr |= TCR_ENAMODE_PERIODIC << t->enamode_shift;

		__raw_writel(tcr, t->base + TCR);
	}
	return 0;
}

static inline u32 timer32_read(struct timer_s *t)
{
	return __raw_readl(t->base + t->tim_off);
}

static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
	struct clock_event_device *evt = &clockevent_davinci;

	evt->event_handler(evt);
	return IRQ_HANDLED;
}

/* called when 32-bit counter wraps */
static irqreturn_t freerun_interrupt(int irq, void *dev_id)
{
	return IRQ_HANDLED;
}

static struct timer_s timers[] = {
	[TID_CLOCKEVENT] = {
		.name      = "clockevent",
		.opts      = TIMER_OPTS_DISABLED,
		.irqaction = {
			.flags   = IRQF_DISABLED | IRQF_TIMER,
			.handler = timer_interrupt,
		}
	},
	[TID_CLOCKSOURCE] = {
		.name       = "free-run counter",
		.period     = ~0,
		.opts       = TIMER_OPTS_PERIODIC,
		.irqaction = {
			.flags   = IRQF_DISABLED | IRQF_TIMER,
			.handler = freerun_interrupt,
		}
	},
};

static void __init timer_init(void)
{
	struct davinci_soc_info *soc_info = &davinci_soc_info;
	struct davinci_timer_instance *dtip = soc_info->timer_info->timers;
	int i;

	/* Global init of each 64-bit timer as a whole */
	for(i=0; i<2; i++) {
		u32 tgcr;
		void __iomem *base = dtip[i].base;

		/* Disabled, Internal clock source */
		__raw_writel(0, base + TCR);

		/* reset both timers, no pre-scaler for timer34 */
		tgcr = 0;
		__raw_writel(tgcr, base + TGCR);

		/* Set both timers to unchained 32-bit */
		tgcr = TGCR_TIMMODE_32BIT_UNCHAINED << TGCR_TIMMODE_SHIFT;
		__raw_writel(tgcr, base + TGCR);

		/* Unreset timers */
		tgcr |= (TGCR_UNRESET << TGCR_TIM12RS_SHIFT) |
			(TGCR_UNRESET << TGCR_TIM34RS_SHIFT);
		__raw_writel(tgcr, base + TGCR);

		/* Init both counters to zero */
		__raw_writel(0, base + TIM12);
		__raw_writel(0, base + TIM34);
	}

	/* Init of each timer as a 32-bit timer */
	for (i=0; i< ARRAY_SIZE(timers); i++) {
		struct timer_s *t = &timers[i];
		int timer = ID_TO_TIMER(t->id);
		u32 irq;

		t->base = dtip[timer].base;

		if (IS_TIMER_BOT(t->id)) {
			t->enamode_shift = 6;
			t->tim_off = TIM12;
			t->prd_off = PRD12;
			irq = dtip[timer].bottom_irq;
		} else {
			t->enamode_shift = 22;
			t->tim_off = TIM34;
			t->prd_off = PRD34;
			irq = dtip[timer].top_irq;
		}

		/* Register interrupt */
		t->irqaction.name = t->name;
		t->irqaction.dev_id = (void *)t;

		if (t->irqaction.handler != NULL) {
			irq = USING_COMPARE(t) ? dtip[i].cmp_irq : irq;
			setup_irq(irq, &t->irqaction);
		}

		timer32_config(&timers[i]);
	}
}

/*
 * clocksource
 */
static cycle_t read_cycles(struct clocksource *cs)
{
	struct timer_s *t = &timers[TID_CLOCKSOURCE];

	return (cycles_t)timer32_read(t);
}

static struct clocksource clocksource_davinci = {
	.rating		= 300,
	.read		= read_cycles,
	.mask		= CLOCKSOURCE_MASK(32),
	.shift		= 24,
	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
};

/*
 * clockevent
 */
static int davinci_set_next_event(unsigned long cycles,
				  struct clock_event_device *evt)
{
	struct timer_s *t = &timers[TID_CLOCKEVENT];

	t->period = cycles;
	timer32_config(t);
	return 0;
}

static void davinci_set_mode(enum clock_event_mode mode,
			     struct clock_event_device *evt)
{
	struct timer_s *t = &timers[TID_CLOCKEVENT];

	switch (mode) {
	case CLOCK_EVT_MODE_PERIODIC:
		t->period = davinci_clock_tick_rate / (HZ);
		t->opts &= ~TIMER_OPTS_STATE_MASK;
		t->opts |= TIMER_OPTS_PERIODIC;
		timer32_config(t);
		break;
	case CLOCK_EVT_MODE_ONESHOT:
		t->opts &= ~TIMER_OPTS_STATE_MASK;
		t->opts |= TIMER_OPTS_ONESHOT;
		break;
	case CLOCK_EVT_MODE_UNUSED:
	case CLOCK_EVT_MODE_SHUTDOWN:
		t->opts &= ~TIMER_OPTS_STATE_MASK;
		t->opts |= TIMER_OPTS_DISABLED;
		break;
	case CLOCK_EVT_MODE_RESUME:
		break;
	}
}

static struct clock_event_device clockevent_davinci = {
	.features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
	.shift		= 32,
	.set_next_event	= davinci_set_next_event,
	.set_mode	= davinci_set_mode,
};


static void __init davinci_timer_init(void)
{
	struct clk *timer_clk;
	struct davinci_soc_info *soc_info = &davinci_soc_info;
	unsigned int clockevent_id;
	unsigned int clocksource_id;
	static char err[] __initdata = KERN_ERR
		"%s: can't register clocksource!\n";

	clockevent_id = soc_info->timer_info->clockevent_id;
	clocksource_id = soc_info->timer_info->clocksource_id;

	timers[TID_CLOCKEVENT].id = clockevent_id;
	timers[TID_CLOCKSOURCE].id = clocksource_id;

	/*
	 * If using same timer for both clock events & clocksource,
	 * a compare register must be used to generate an event interrupt.
	 * This is equivalent to a oneshot timer only (not periodic).
	 */
	if (clockevent_id == clocksource_id) {
		struct davinci_timer_instance *dtip =
				soc_info->timer_info->timers;
		int event_timer = ID_TO_TIMER(clockevent_id);

		/* Only bottom timers can use compare regs */
		if (IS_TIMER_TOP(clockevent_id))
			pr_warning("davinci_timer_init: Invalid use"
				" of system timers.  Results unpredictable.\n");
		else if ((dtip[event_timer].cmp_off == 0)
				|| (dtip[event_timer].cmp_irq == 0))
			pr_warning("davinci_timer_init:  Invalid timer instance"
				" setup.  Results unpredictable.\n");
		else {
			timers[TID_CLOCKEVENT].opts |= TIMER_OPTS_USE_COMPARE;
			clockevent_davinci.features = CLOCK_EVT_FEAT_ONESHOT;
		}
	}

	/* init timer hw */
	timer_init();

	timer_clk = clk_get(NULL, "timer0");
	BUG_ON(IS_ERR(timer_clk));
	clk_enable(timer_clk);

	davinci_clock_tick_rate = clk_get_rate(timer_clk);

	/* setup clocksource */
	clocksource_davinci.name = id_to_name[clocksource_id];
	clocksource_davinci.mult =
		clocksource_khz2mult(davinci_clock_tick_rate/1000,
				     clocksource_davinci.shift);
	if (clocksource_register(&clocksource_davinci))
		printk(err, clocksource_davinci.name);

	/* setup clockevent */
	clockevent_davinci.name = id_to_name[timers[TID_CLOCKEVENT].id];
	clockevent_davinci.mult = div_sc(davinci_clock_tick_rate, NSEC_PER_SEC,
					 clockevent_davinci.shift);
	clockevent_davinci.max_delta_ns =
		clockevent_delta2ns(0xfffffffe, &clockevent_davinci);
	clockevent_davinci.min_delta_ns = 50000; /* 50 usec */

	clockevent_davinci.cpumask = cpumask_of(0);
	clockevents_register_device(&clockevent_davinci);
}

struct sys_timer davinci_timer = {
	.init   = davinci_timer_init,
};


/* reset board using watchdog timer */
void davinci_watchdog_reset(void)
{
	u32 tgcr, wdtcr;
	struct davinci_soc_info *soc_info = &davinci_soc_info;
	void __iomem *base = soc_info->wdt_base;
	struct clk *wd_clk;

	wd_clk = clk_get(&davinci_wdt_device.dev, NULL);
	if (WARN_ON(IS_ERR(wd_clk)))
		return;
	clk_enable(wd_clk);

	/* disable, internal clock source */
	__raw_writel(0, base + TCR);

	/* reset timer, set mode to 64-bit watchdog, and unreset */
	tgcr = 0;
	__raw_writel(tgcr, base + TCR);
	tgcr = TGCR_TIMMODE_64BIT_WDOG << TGCR_TIMMODE_SHIFT;
	tgcr |= (TGCR_UNRESET << TGCR_TIM12RS_SHIFT) |
		(TGCR_UNRESET << TGCR_TIM34RS_SHIFT);
	__raw_writel(tgcr, base + TCR);

	/* clear counter and period regs */
	__raw_writel(0, base + TIM12);
	__raw_writel(0, base + TIM34);
	__raw_writel(0, base + PRD12);
	__raw_writel(0, base + PRD34);

	/* enable */
	wdtcr = __raw_readl(base + WDTCR);
	wdtcr |= WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT;
	__raw_writel(wdtcr, base + WDTCR);

	/* put watchdog in pre-active state */
	wdtcr = (WDTCR_WDKEY_SEQ0 << WDTCR_WDKEY_SHIFT) |
		(WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT);
	__raw_writel(wdtcr, base + WDTCR);

	/* put watchdog in active state */
	wdtcr = (WDTCR_WDKEY_SEQ1 << WDTCR_WDKEY_SHIFT) |
		(WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT);
	__raw_writel(wdtcr, base + WDTCR);

	/* write an invalid value to the WDKEY field to trigger
	 * a watchdog reset */
	wdtcr = 0x00004000;
	__raw_writel(wdtcr, base + WDTCR);
}
Commit	Line	Data
7c6337e2 KH	1	/*
	2	* DaVinci timer subsystem
	3	*
	4	* Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
	5	*
	6	* 2007 (c) MontaVista Software, Inc. This file is licensed under
	7	* the terms of the GNU General Public License version 2. This program
	8	* is licensed "as is" without any warranty of any kind, whether express
	9	* or implied.
	10	*/
	11	#include <linux/kernel.h>
	12	#include <linux/init.h>
	13	#include <linux/types.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/clocksource.h>
	16	#include <linux/clockchips.h>
	17	#include <linux/spinlock.h>
fced80c7	18	#include <linux/io.h>
f5c122da KH	19	#include <linux/clk.h>
	20	#include <linux/err.h>
	21	#include <linux/device.h>
fb631387	22	#include <linux/platform_device.h>
7c6337e2	23
a09e64fb	24	#include <mach/hardware.h>
7c6337e2 KH	25	#include <asm/system.h>
	26	#include <asm/irq.h>
	27	#include <asm/mach/irq.h>
	28	#include <asm/mach/time.h>
	29	#include <asm/errno.h>
a09e64fb	30	#include <mach/io.h>
f5c122da	31	#include <mach/cputype.h>
f64691b3	32	#include <mach/time.h>
f5c122da	33	#include "clock.h"
7c6337e2 KH	34
7c6337e2 KH	35	static struct clock_event_device clockevent_davinci;
e6099002	36	static unsigned int davinci_clock_tick_rate;
7c6337e2	37
7c6337e2 KH	38	/*
	39	* This driver configures the 2 64-bit count-up timers as 4 independent
	40	* 32-bit count-up timers used as follows:
7c6337e2	41	*/
f64691b3 MG	42
	43	enum {
	44	TID_CLOCKEVENT,
	45	TID_CLOCKSOURCE,
	46	};
7c6337e2 KH	47
7c6337e2 KH	48	/* Timer register offsets */
3abd5acf MG	49	#define PID12 0x0
	50	#define TIM12 0x10
	51	#define TIM34 0x14
	52	#define PRD12 0x18
	53	#define PRD34 0x1c
	54	#define TCR 0x20
	55	#define TGCR 0x24
	56	#define WDTCR 0x28
	57
	58	/* Offsets of the 8 compare registers */
	59	#define CMP12_0 0x60
	60	#define CMP12_1 0x64
	61	#define CMP12_2 0x68
	62	#define CMP12_3 0x6c
	63	#define CMP12_4 0x70
	64	#define CMP12_5 0x74
	65	#define CMP12_6 0x78
	66	#define CMP12_7 0x7c
7c6337e2 KH	67
	68	/* Timer register bitfields */
	69	#define TCR_ENAMODE_DISABLE 0x0
	70	#define TCR_ENAMODE_ONESHOT 0x1
	71	#define TCR_ENAMODE_PERIODIC 0x2
	72	#define TCR_ENAMODE_MASK 0x3
	73
	74	#define TGCR_TIMMODE_SHIFT 2
	75	#define TGCR_TIMMODE_64BIT_GP 0x0
	76	#define TGCR_TIMMODE_32BIT_UNCHAINED 0x1
	77	#define TGCR_TIMMODE_64BIT_WDOG 0x2
	78	#define TGCR_TIMMODE_32BIT_CHAINED 0x3
	79
	80	#define TGCR_TIM12RS_SHIFT 0
	81	#define TGCR_TIM34RS_SHIFT 1
	82	#define TGCR_RESET 0x0
	83	#define TGCR_UNRESET 0x1
	84	#define TGCR_RESET_MASK 0x3
	85
	86	#define WDTCR_WDEN_SHIFT 14
	87	#define WDTCR_WDEN_DISABLE 0x0
	88	#define WDTCR_WDEN_ENABLE 0x1
	89	#define WDTCR_WDKEY_SHIFT 16
	90	#define WDTCR_WDKEY_SEQ0 0xa5c6
	91	#define WDTCR_WDKEY_SEQ1 0xda7e
	92
	93	struct timer_s {
	94	char *name;
	95	unsigned int id;
	96	unsigned long period;
	97	unsigned long opts;
3abd5acf	98	unsigned long flags;
f5c122da KH	99	void __iomem *base;
	100	unsigned long tim_off;
	101	unsigned long prd_off;
7c6337e2 KH	102	unsigned long enamode_shift;
	103	struct irqaction irqaction;
	104	};
	105	static struct timer_s timers[];
	106
	107	/* values for 'opts' field of struct timer_s */
3abd5acf MG	108	#define TIMER_OPTS_DISABLED 0x01
	109	#define TIMER_OPTS_ONESHOT 0x02
	110	#define TIMER_OPTS_PERIODIC 0x04
	111	#define TIMER_OPTS_STATE_MASK 0x07
	112
	113	#define TIMER_OPTS_USE_COMPARE 0x80000000
	114	#define USING_COMPARE(t) ((t)->opts & TIMER_OPTS_USE_COMPARE)
7c6337e2	115
f64691b3 MG	116	static char *id_to_name[] = {
	117	[T0_BOT] = "timer0_0",
	118	[T0_TOP] = "timer0_1",
	119	[T1_BOT] = "timer1_0",
	120	[T1_TOP] = "timer1_1",
	121	};
	122
7c6337e2 KH	123	static int timer32_config(struct timer_s *t)
7c6337e2 KH	124	{
3abd5acf MG	125	u32 tcr;
	126	struct davinci_soc_info *soc_info = davinci_get_soc_info();
	127
	128	if (USING_COMPARE(t)) {
	129	struct davinci_timer_instance *dtip =
	130	soc_info->timer_info->timers;
	131	int event_timer = ID_TO_TIMER(timers[TID_CLOCKEVENT].id);
	132
	133	/*
	134	* Next interrupt should be the current time reg value plus
	135	* the new period (using 32-bit unsigned addition/wrapping
	136	* to 0 on overflow). This assumes that the clocksource
	137	* is setup to count to 2^32-1 before wrapping around to 0.
	138	*/
	139	__raw_writel(__raw_readl(t->base + t->tim_off) + t->period,
	140	t->base + dtip[event_timer].cmp_off);
	141	} else {
	142	tcr = __raw_readl(t->base + TCR);
	143
	144	/* disable timer */
	145	tcr &= ~(TCR_ENAMODE_MASK << t->enamode_shift);
	146	__raw_writel(tcr, t->base + TCR);
	147
	148	/* reset counter to zero, set new period */
	149	__raw_writel(0, t->base + t->tim_off);
	150	__raw_writel(t->period, t->base + t->prd_off);
	151
	152	/* Set enable mode */
	153	if (t->opts & TIMER_OPTS_ONESHOT)
	154	tcr \|= TCR_ENAMODE_ONESHOT << t->enamode_shift;
	155	else if (t->opts & TIMER_OPTS_PERIODIC)
	156	tcr \|= TCR_ENAMODE_PERIODIC << t->enamode_shift;
	157
	158	__raw_writel(tcr, t->base + TCR);
7c6337e2	159	}
7c6337e2 KH	160	return 0;
	161	}
	162
	163	static inline u32 timer32_read(struct timer_s *t)
	164	{
f5c122da	165	return __raw_readl(t->base + t->tim_off);
7c6337e2 KH	166	}
	167
	168	static irqreturn_t timer_interrupt(int irq, void *dev_id)
	169	{
	170	struct clock_event_device *evt = &clockevent_davinci;
	171
	172	evt->event_handler(evt);
	173	return IRQ_HANDLED;
	174	}
	175
	176	/* called when 32-bit counter wraps */
	177	static irqreturn_t freerun_interrupt(int irq, void *dev_id)
	178	{
	179	return IRQ_HANDLED;
	180	}
	181
	182	static struct timer_s timers[] = {
	183	[TID_CLOCKEVENT] = {
	184	.name = "clockevent",
	185	.opts = TIMER_OPTS_DISABLED,
	186	.irqaction = {
	187	.flags = IRQF_DISABLED \| IRQF_TIMER,
	188	.handler = timer_interrupt,
	189	}
	190	},
	191	[TID_CLOCKSOURCE] = {
	192	.name = "free-run counter",
	193	.period = ~0,
	194	.opts = TIMER_OPTS_PERIODIC,
	195	.irqaction = {
	196	.flags = IRQF_DISABLED \| IRQF_TIMER,
	197	.handler = freerun_interrupt,
	198	}
	199	},
	200	};
	201
	202	static void __init timer_init(void)
	203	{
f64691b3 MG	204	struct davinci_soc_info *soc_info = &davinci_soc_info;
f64691b3 MG	205	struct davinci_timer_instance *dtip = soc_info->timer_info->timers;
7c6337e2 KH	206	int i;
	207
	208	/* Global init of each 64-bit timer as a whole */
	209	for(i=0; i<2; i++) {
f5c122da	210	u32 tgcr;
f64691b3	211	void __iomem *base = dtip[i].base;
7c6337e2 KH	212
7c6337e2 KH	213	/* Disabled, Internal clock source */
f5c122da	214	__raw_writel(0, base + TCR);
7c6337e2 KH	215
	216	/* reset both timers, no pre-scaler for timer34 */
	217	tgcr = 0;
f5c122da	218	__raw_writel(tgcr, base + TGCR);
7c6337e2 KH	219
	220	/* Set both timers to unchained 32-bit */
	221	tgcr = TGCR_TIMMODE_32BIT_UNCHAINED << TGCR_TIMMODE_SHIFT;
f5c122da	222	__raw_writel(tgcr, base + TGCR);
7c6337e2 KH	223
	224	/* Unreset timers */
	225	tgcr \|= (TGCR_UNRESET << TGCR_TIM12RS_SHIFT) \|
	226	(TGCR_UNRESET << TGCR_TIM34RS_SHIFT);
f5c122da	227	__raw_writel(tgcr, base + TGCR);
7c6337e2 KH	228
7c6337e2 KH	229	/* Init both counters to zero */
f5c122da KH	230	__raw_writel(0, base + TIM12);
f5c122da KH	231	__raw_writel(0, base + TIM34);
7c6337e2 KH	232	}
	233
	234	/* Init of each timer as a 32-bit timer */
	235	for (i=0; i< ARRAY_SIZE(timers); i++) {
	236	struct timer_s *t = &timers[i];
f64691b3 MG	237	int timer = ID_TO_TIMER(t->id);
	238	u32 irq;
	239
	240	t->base = dtip[timer].base;
	241
	242	if (IS_TIMER_BOT(t->id)) {
	243	t->enamode_shift = 6;
	244	t->tim_off = TIM12;
	245	t->prd_off = PRD12;
	246	irq = dtip[timer].bottom_irq;
	247	} else {
	248	t->enamode_shift = 22;
	249	t->tim_off = TIM34;
	250	t->prd_off = PRD34;
	251	irq = dtip[timer].top_irq;
7c6337e2	252	}
f64691b3 MG	253
	254	/* Register interrupt */
	255	t->irqaction.name = t->name;
	256	t->irqaction.dev_id = (void *)t;
3abd5acf MG	257
	258	if (t->irqaction.handler != NULL) {
	259	irq = USING_COMPARE(t) ? dtip[i].cmp_irq : irq;
f64691b3	260	setup_irq(irq, &t->irqaction);
3abd5acf	261	}
f64691b3 MG	262
f64691b3 MG	263	timer32_config(&timers[i]);
7c6337e2 KH	264	}
	265	}
	266
	267	/*
	268	* clocksource
	269	*/
8e19608e	270	static cycle_t read_cycles(struct clocksource *cs)
7c6337e2 KH	271	{
	272	struct timer_s *t = &timers[TID_CLOCKSOURCE];
	273
	274	return (cycles_t)timer32_read(t);
	275	}
	276
	277	static struct clocksource clocksource_davinci = {
7c6337e2 KH	278	.rating = 300,
	279	.read = read_cycles,
	280	.mask = CLOCKSOURCE_MASK(32),
	281	.shift = 24,
	282	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
	283	};
	284
	285	/*
	286	* clockevent
	287	*/
	288	static int davinci_set_next_event(unsigned long cycles,
	289	struct clock_event_device *evt)
	290	{
	291	struct timer_s *t = &timers[TID_CLOCKEVENT];
	292
	293	t->period = cycles;
	294	timer32_config(t);
	295	return 0;
	296	}
	297
	298	static void davinci_set_mode(enum clock_event_mode mode,
	299	struct clock_event_device *evt)
	300	{
	301	struct timer_s *t = &timers[TID_CLOCKEVENT];
	302
	303	switch (mode) {
	304	case CLOCK_EVT_MODE_PERIODIC:
e6099002	305	t->period = davinci_clock_tick_rate / (HZ);
3abd5acf MG	306	t->opts &= ~TIMER_OPTS_STATE_MASK;
3abd5acf MG	307	t->opts \|= TIMER_OPTS_PERIODIC;
7c6337e2 KH	308	timer32_config(t);
	309	break;
	310	case CLOCK_EVT_MODE_ONESHOT:
3abd5acf MG	311	t->opts &= ~TIMER_OPTS_STATE_MASK;
3abd5acf MG	312	t->opts \|= TIMER_OPTS_ONESHOT;
7c6337e2 KH	313	break;
	314	case CLOCK_EVT_MODE_UNUSED:
	315	case CLOCK_EVT_MODE_SHUTDOWN:
3abd5acf MG	316	t->opts &= ~TIMER_OPTS_STATE_MASK;
3abd5acf MG	317	t->opts \|= TIMER_OPTS_DISABLED;
7c6337e2	318	break;
18de5bc4 TG	319	case CLOCK_EVT_MODE_RESUME:
18de5bc4 TG	320	break;
7c6337e2 KH	321	}
	322	}
	323
	324	static struct clock_event_device clockevent_davinci = {
7c6337e2 KH	325	.features = CLOCK_EVT_FEAT_PERIODIC \| CLOCK_EVT_FEAT_ONESHOT,
	326	.shift = 32,
	327	.set_next_event = davinci_set_next_event,
	328	.set_mode = davinci_set_mode,
	329	};
	330
	331
	332	static void __init davinci_timer_init(void)
	333	{
e6099002	334	struct clk *timer_clk;
f64691b3	335	struct davinci_soc_info *soc_info = &davinci_soc_info;
3abd5acf MG	336	unsigned int clockevent_id;
3abd5acf MG	337	unsigned int clocksource_id;
7c6337e2 KH	338	static char err[] __initdata = KERN_ERR
	339	"%s: can't register clocksource!\n";
	340
3abd5acf MG	341	clockevent_id = soc_info->timer_info->clockevent_id;
	342	clocksource_id = soc_info->timer_info->clocksource_id;
	343
	344	timers[TID_CLOCKEVENT].id = clockevent_id;
	345	timers[TID_CLOCKSOURCE].id = clocksource_id;
	346
	347	/*
	348	* If using same timer for both clock events & clocksource,
	349	* a compare register must be used to generate an event interrupt.
	350	* This is equivalent to a oneshot timer only (not periodic).
	351	*/
	352	if (clockevent_id == clocksource_id) {
	353	struct davinci_timer_instance *dtip =
	354	soc_info->timer_info->timers;
	355	int event_timer = ID_TO_TIMER(clockevent_id);
	356
	357	/* Only bottom timers can use compare regs */
	358	if (IS_TIMER_TOP(clockevent_id))
	359	pr_warning("davinci_timer_init: Invalid use"
	360	" of system timers. Results unpredictable.\n");
	361	else if ((dtip[event_timer].cmp_off == 0)
	362	\|\| (dtip[event_timer].cmp_irq == 0))
	363	pr_warning("davinci_timer_init: Invalid timer instance"
	364	" setup. Results unpredictable.\n");
	365	else {
	366	timers[TID_CLOCKEVENT].opts \|= TIMER_OPTS_USE_COMPARE;
	367	clockevent_davinci.features = CLOCK_EVT_FEAT_ONESHOT;
	368	}
	369	}
f64691b3	370
7c6337e2 KH	371	/* init timer hw */
	372	timer_init();
	373
e6099002 KH	374	timer_clk = clk_get(NULL, "timer0");
	375	BUG_ON(IS_ERR(timer_clk));
	376	clk_enable(timer_clk);
	377
	378	davinci_clock_tick_rate = clk_get_rate(timer_clk);
	379
7c6337e2	380	/* setup clocksource */
3abd5acf	381	clocksource_davinci.name = id_to_name[clocksource_id];
7c6337e2	382	clocksource_davinci.mult =
e6099002	383	clocksource_khz2mult(davinci_clock_tick_rate/1000,
7c6337e2 KH	384	clocksource_davinci.shift);
	385	if (clocksource_register(&clocksource_davinci))
	386	printk(err, clocksource_davinci.name);
	387
	388	/* setup clockevent */
f64691b3	389	clockevent_davinci.name = id_to_name[timers[TID_CLOCKEVENT].id];
e6099002	390	clockevent_davinci.mult = div_sc(davinci_clock_tick_rate, NSEC_PER_SEC,
7c6337e2 KH	391	clockevent_davinci.shift);
	392	clockevent_davinci.max_delta_ns =
	393	clockevent_delta2ns(0xfffffffe, &clockevent_davinci);
3abd5acf	394	clockevent_davinci.min_delta_ns = 50000; /* 50 usec */
7c6337e2	395
320ab2b0	396	clockevent_davinci.cpumask = cpumask_of(0);
7c6337e2 KH	397	clockevents_register_device(&clockevent_davinci);
	398	}
	399
	400	struct sys_timer davinci_timer = {
	401	.init = davinci_timer_init,
	402	};
	403
	404
	405	/* reset board using watchdog timer */
fb631387 KH	406	void davinci_watchdog_reset(void)
fb631387 KH	407	{
f5c122da	408	u32 tgcr, wdtcr;
951d6f6d MG	409	struct davinci_soc_info *soc_info = &davinci_soc_info;
951d6f6d MG	410	void __iomem *base = soc_info->wdt_base;
e6099002	411	struct clk *wd_clk;
e6099002	412
fb631387	413	wd_clk = clk_get(&davinci_wdt_device.dev, NULL);
e6099002 KH	414	if (WARN_ON(IS_ERR(wd_clk)))
	415	return;
	416	clk_enable(wd_clk);
7c6337e2 KH	417
7c6337e2 KH	418	/* disable, internal clock source */
f5c122da	419	__raw_writel(0, base + TCR);
7c6337e2 KH	420
	421	/* reset timer, set mode to 64-bit watchdog, and unreset */
	422	tgcr = 0;
f5c122da	423	__raw_writel(tgcr, base + TCR);
7c6337e2 KH	424	tgcr = TGCR_TIMMODE_64BIT_WDOG << TGCR_TIMMODE_SHIFT;
	425	tgcr \|= (TGCR_UNRESET << TGCR_TIM12RS_SHIFT) \|
	426	(TGCR_UNRESET << TGCR_TIM34RS_SHIFT);
f5c122da	427	__raw_writel(tgcr, base + TCR);
7c6337e2 KH	428
7c6337e2 KH	429	/* clear counter and period regs */
f5c122da KH	430	__raw_writel(0, base + TIM12);
	431	__raw_writel(0, base + TIM34);
	432	__raw_writel(0, base + PRD12);
	433	__raw_writel(0, base + PRD34);
7c6337e2 KH	434
7c6337e2 KH	435	/* enable */
f5c122da	436	wdtcr = __raw_readl(base + WDTCR);
7c6337e2	437	wdtcr \|= WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT;
f5c122da	438	__raw_writel(wdtcr, base + WDTCR);
7c6337e2 KH	439
	440	/* put watchdog in pre-active state */
	441	wdtcr = (WDTCR_WDKEY_SEQ0 << WDTCR_WDKEY_SHIFT) \|
	442	(WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT);
f5c122da	443	__raw_writel(wdtcr, base + WDTCR);
7c6337e2 KH	444
	445	/* put watchdog in active state */
	446	wdtcr = (WDTCR_WDKEY_SEQ1 << WDTCR_WDKEY_SHIFT) \|
	447	(WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT);
f5c122da	448	__raw_writel(wdtcr, base + WDTCR);
7c6337e2 KH	449
	450	/* write an invalid value to the WDKEY field to trigger
	451	* a watchdog reset */
	452	wdtcr = 0x00004000;
f5c122da	453	__raw_writel(wdtcr, base + WDTCR);
7c6337e2	454	}