[deliverable/linux.git] / arch / mips / bcm63xx / timer.c

/*
 * 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.
 *
 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <bcm63xx_cpu.h>
#include <bcm63xx_io.h>
#include <bcm63xx_timer.h>
#include <bcm63xx_regs.h>

static DEFINE_RAW_SPINLOCK(timer_reg_lock);
static DEFINE_RAW_SPINLOCK(timer_data_lock);
static struct clk *periph_clk;

static struct timer_data {
	void	(*cb)(void *);
	void	*data;
} timer_data[BCM63XX_TIMER_COUNT];

static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
	u32 stat;
	int i;

	raw_spin_lock(&timer_reg_lock);
	stat = bcm_timer_readl(TIMER_IRQSTAT_REG);
	bcm_timer_writel(stat, TIMER_IRQSTAT_REG);
	raw_spin_unlock(&timer_reg_lock);

	for (i = 0; i < BCM63XX_TIMER_COUNT; i++) {
		if (!(stat & TIMER_IRQSTAT_TIMER_CAUSE(i)))
			continue;

		raw_spin_lock(&timer_data_lock);
		if (!timer_data[i].cb) {
			raw_spin_unlock(&timer_data_lock);
			continue;
		}

		timer_data[i].cb(timer_data[i].data);
		raw_spin_unlock(&timer_data_lock);
	}

	return IRQ_HANDLED;
}

int bcm63xx_timer_enable(int id)
{
	u32 reg;
	unsigned long flags;

	if (id >= BCM63XX_TIMER_COUNT)
		return -EINVAL;

	raw_spin_lock_irqsave(&timer_reg_lock, flags);

	reg = bcm_timer_readl(TIMER_CTLx_REG(id));
	reg |= TIMER_CTL_ENABLE_MASK;
	bcm_timer_writel(reg, TIMER_CTLx_REG(id));

	reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
	reg |= TIMER_IRQSTAT_TIMER_IR_EN(id);
	bcm_timer_writel(reg, TIMER_IRQSTAT_REG);

	raw_spin_unlock_irqrestore(&timer_reg_lock, flags);
	return 0;
}

EXPORT_SYMBOL(bcm63xx_timer_enable);

int bcm63xx_timer_disable(int id)
{
	u32 reg;
	unsigned long flags;

	if (id >= BCM63XX_TIMER_COUNT)
		return -EINVAL;

	raw_spin_lock_irqsave(&timer_reg_lock, flags);

	reg = bcm_timer_readl(TIMER_CTLx_REG(id));
	reg &= ~TIMER_CTL_ENABLE_MASK;
	bcm_timer_writel(reg, TIMER_CTLx_REG(id));

	reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
	reg &= ~TIMER_IRQSTAT_TIMER_IR_EN(id);
	bcm_timer_writel(reg, TIMER_IRQSTAT_REG);

	raw_spin_unlock_irqrestore(&timer_reg_lock, flags);
	return 0;
}

EXPORT_SYMBOL(bcm63xx_timer_disable);

int bcm63xx_timer_register(int id, void (*callback)(void *data), void *data)
{
	unsigned long flags;
	int ret;

	if (id >= BCM63XX_TIMER_COUNT || !callback)
		return -EINVAL;

	ret = 0;
	raw_spin_lock_irqsave(&timer_data_lock, flags);
	if (timer_data[id].cb) {
		ret = -EBUSY;
		goto out;
	}

	timer_data[id].cb = callback;
	timer_data[id].data = data;

out:
	raw_spin_unlock_irqrestore(&timer_data_lock, flags);
	return ret;
}

EXPORT_SYMBOL(bcm63xx_timer_register);

void bcm63xx_timer_unregister(int id)
{
	unsigned long flags;

	if (id >= BCM63XX_TIMER_COUNT)
		return;

	raw_spin_lock_irqsave(&timer_data_lock, flags);
	timer_data[id].cb = NULL;
	raw_spin_unlock_irqrestore(&timer_data_lock, flags);
}

EXPORT_SYMBOL(bcm63xx_timer_unregister);

unsigned int bcm63xx_timer_countdown(unsigned int countdown_us)
{
	return (clk_get_rate(periph_clk) / (1000 * 1000)) * countdown_us;
}

EXPORT_SYMBOL(bcm63xx_timer_countdown);

int bcm63xx_timer_set(int id, int monotonic, unsigned int countdown_us)
{
	u32 reg, countdown;
	unsigned long flags;

	if (id >= BCM63XX_TIMER_COUNT)
		return -EINVAL;

	countdown = bcm63xx_timer_countdown(countdown_us);
	if (countdown & ~TIMER_CTL_COUNTDOWN_MASK)
		return -EINVAL;

	raw_spin_lock_irqsave(&timer_reg_lock, flags);
	reg = bcm_timer_readl(TIMER_CTLx_REG(id));

	if (monotonic)
		reg &= ~TIMER_CTL_MONOTONIC_MASK;
	else
		reg |= TIMER_CTL_MONOTONIC_MASK;

	reg &= ~TIMER_CTL_COUNTDOWN_MASK;
	reg |= countdown;
	bcm_timer_writel(reg, TIMER_CTLx_REG(id));

	raw_spin_unlock_irqrestore(&timer_reg_lock, flags);
	return 0;
}

EXPORT_SYMBOL(bcm63xx_timer_set);

int bcm63xx_timer_init(void)
{
	int ret, irq;
	u32 reg;

	reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
	reg &= ~TIMER_IRQSTAT_TIMER0_IR_EN;
	reg &= ~TIMER_IRQSTAT_TIMER1_IR_EN;
	reg &= ~TIMER_IRQSTAT_TIMER2_IR_EN;
	bcm_timer_writel(reg, TIMER_IRQSTAT_REG);

	periph_clk = clk_get(NULL, "periph");
	if (IS_ERR(periph_clk))
		return -ENODEV;

	irq = bcm63xx_get_irq_number(IRQ_TIMER);
	ret = request_irq(irq, timer_interrupt, 0, "bcm63xx_timer", NULL);
	if (ret) {
		printk(KERN_ERR "bcm63xx_timer: failed to register irq\n");
		return ret;
	}

	return 0;
}

arch_initcall(bcm63xx_timer_init);
Commit	Line	Data
e7300d04 MB	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/err.h>
	11	#include <linux/module.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/clk.h>
	15	#include <bcm63xx_cpu.h>
	16	#include <bcm63xx_io.h>
	17	#include <bcm63xx_timer.h>
	18	#include <bcm63xx_regs.h>
	19
d8d607d5 RB	20	static DEFINE_RAW_SPINLOCK(timer_reg_lock);
d8d607d5 RB	21	static DEFINE_RAW_SPINLOCK(timer_data_lock);
e7300d04 MB	22	static struct clk *periph_clk;
	23
	24	static struct timer_data {
	25	void (cb)(void );
	26	void *data;
	27	} timer_data[BCM63XX_TIMER_COUNT];
	28
	29	static irqreturn_t timer_interrupt(int irq, void *dev_id)
	30	{
	31	u32 stat;
	32	int i;
	33
d8d607d5	34	raw_spin_lock(&timer_reg_lock);
e7300d04 MB	35	stat = bcm_timer_readl(TIMER_IRQSTAT_REG);
e7300d04 MB	36	bcm_timer_writel(stat, TIMER_IRQSTAT_REG);
d8d607d5	37	raw_spin_unlock(&timer_reg_lock);
e7300d04 MB	38
	39	for (i = 0; i < BCM63XX_TIMER_COUNT; i++) {
	40	if (!(stat & TIMER_IRQSTAT_TIMER_CAUSE(i)))
	41	continue;
	42
d8d607d5	43	raw_spin_lock(&timer_data_lock);
e7300d04	44	if (!timer_data[i].cb) {
d8d607d5	45	raw_spin_unlock(&timer_data_lock);
e7300d04 MB	46	continue;
	47	}
	48
	49	timer_data[i].cb(timer_data[i].data);
d8d607d5	50	raw_spin_unlock(&timer_data_lock);
e7300d04 MB	51	}
	52
	53	return IRQ_HANDLED;
	54	}
	55
	56	int bcm63xx_timer_enable(int id)
	57	{
	58	u32 reg;
	59	unsigned long flags;
	60
	61	if (id >= BCM63XX_TIMER_COUNT)
	62	return -EINVAL;
	63
d8d607d5	64	raw_spin_lock_irqsave(&timer_reg_lock, flags);
e7300d04 MB	65
	66	reg = bcm_timer_readl(TIMER_CTLx_REG(id));
	67	reg \|= TIMER_CTL_ENABLE_MASK;
	68	bcm_timer_writel(reg, TIMER_CTLx_REG(id));
	69
	70	reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
	71	reg \|= TIMER_IRQSTAT_TIMER_IR_EN(id);
	72	bcm_timer_writel(reg, TIMER_IRQSTAT_REG);
	73
d8d607d5	74	raw_spin_unlock_irqrestore(&timer_reg_lock, flags);
e7300d04 MB	75	return 0;
	76	}
	77
	78	EXPORT_SYMBOL(bcm63xx_timer_enable);
	79
	80	int bcm63xx_timer_disable(int id)
	81	{
	82	u32 reg;
	83	unsigned long flags;
	84
	85	if (id >= BCM63XX_TIMER_COUNT)
	86	return -EINVAL;
	87
d8d607d5	88	raw_spin_lock_irqsave(&timer_reg_lock, flags);
e7300d04 MB	89
	90	reg = bcm_timer_readl(TIMER_CTLx_REG(id));
	91	reg &= ~TIMER_CTL_ENABLE_MASK;
	92	bcm_timer_writel(reg, TIMER_CTLx_REG(id));
	93
	94	reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
	95	reg &= ~TIMER_IRQSTAT_TIMER_IR_EN(id);
	96	bcm_timer_writel(reg, TIMER_IRQSTAT_REG);
	97
d8d607d5	98	raw_spin_unlock_irqrestore(&timer_reg_lock, flags);
e7300d04 MB	99	return 0;
	100	}
	101
	102	EXPORT_SYMBOL(bcm63xx_timer_disable);
	103
	104	int bcm63xx_timer_register(int id, void (callback)(void data), void *data)
	105	{
	106	unsigned long flags;
	107	int ret;
	108
	109	if (id >= BCM63XX_TIMER_COUNT \|\| !callback)
	110	return -EINVAL;
	111
	112	ret = 0;
d8d607d5	113	raw_spin_lock_irqsave(&timer_data_lock, flags);
e7300d04 MB	114	if (timer_data[id].cb) {
	115	ret = -EBUSY;
	116	goto out;
	117	}
	118
	119	timer_data[id].cb = callback;
	120	timer_data[id].data = data;
	121
	122	out:
d8d607d5	123	raw_spin_unlock_irqrestore(&timer_data_lock, flags);
e7300d04 MB	124	return ret;
	125	}
	126
	127	EXPORT_SYMBOL(bcm63xx_timer_register);
	128
	129	void bcm63xx_timer_unregister(int id)
	130	{
	131	unsigned long flags;
	132
	133	if (id >= BCM63XX_TIMER_COUNT)
	134	return;
	135
d8d607d5	136	raw_spin_lock_irqsave(&timer_data_lock, flags);
e7300d04	137	timer_data[id].cb = NULL;
d8d607d5	138	raw_spin_unlock_irqrestore(&timer_data_lock, flags);
e7300d04 MB	139	}
	140
	141	EXPORT_SYMBOL(bcm63xx_timer_unregister);
	142
	143	unsigned int bcm63xx_timer_countdown(unsigned int countdown_us)
	144	{
	145	return (clk_get_rate(periph_clk) / (1000 * 1000)) * countdown_us;
	146	}
	147
	148	EXPORT_SYMBOL(bcm63xx_timer_countdown);
	149
	150	int bcm63xx_timer_set(int id, int monotonic, unsigned int countdown_us)
	151	{
	152	u32 reg, countdown;
	153	unsigned long flags;
	154
	155	if (id >= BCM63XX_TIMER_COUNT)
	156	return -EINVAL;
	157
	158	countdown = bcm63xx_timer_countdown(countdown_us);
	159	if (countdown & ~TIMER_CTL_COUNTDOWN_MASK)
	160	return -EINVAL;
	161
d8d607d5	162	raw_spin_lock_irqsave(&timer_reg_lock, flags);
e7300d04 MB	163	reg = bcm_timer_readl(TIMER_CTLx_REG(id));
	164
	165	if (monotonic)
	166	reg &= ~TIMER_CTL_MONOTONIC_MASK;
	167	else
	168	reg \|= TIMER_CTL_MONOTONIC_MASK;
	169
	170	reg &= ~TIMER_CTL_COUNTDOWN_MASK;
	171	reg \|= countdown;
	172	bcm_timer_writel(reg, TIMER_CTLx_REG(id));
	173
d8d607d5	174	raw_spin_unlock_irqrestore(&timer_reg_lock, flags);
e7300d04 MB	175	return 0;
	176	}
	177
	178	EXPORT_SYMBOL(bcm63xx_timer_set);
	179
	180	int bcm63xx_timer_init(void)
	181	{
	182	int ret, irq;
	183	u32 reg;
	184
	185	reg = bcm_timer_readl(TIMER_IRQSTAT_REG);
	186	reg &= ~TIMER_IRQSTAT_TIMER0_IR_EN;
	187	reg &= ~TIMER_IRQSTAT_TIMER1_IR_EN;
	188	reg &= ~TIMER_IRQSTAT_TIMER2_IR_EN;
	189	bcm_timer_writel(reg, TIMER_IRQSTAT_REG);
	190
	191	periph_clk = clk_get(NULL, "periph");
	192	if (IS_ERR(periph_clk))
	193	return -ENODEV;
	194
	195	irq = bcm63xx_get_irq_number(IRQ_TIMER);
	196	ret = request_irq(irq, timer_interrupt, 0, "bcm63xx_timer", NULL);
	197	if (ret) {
	198	printk(KERN_ERR "bcm63xx_timer: failed to register irq\n");
	199	return ret;
	200	}
	201
	202	return 0;
	203	}
	204
	205	arch_initcall(bcm63xx_timer_init);