/* * 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/init.h>#include <linux/export.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); static 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) {		pr_err("%s: failed to register irq\n", __func__);		return ret;	} 	return 0;} arch_initcall(bcm63xx_timer_init);