mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-05 05:49:42 +02:00
206 lines
4.3 KiB
C
206 lines
4.3 KiB
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_SPINLOCK(timer_reg_lock);
|
||
|
static DEFINE_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;
|
||
|
|
||
|
spin_lock(&timer_reg_lock);
|
||
|
stat = bcm_timer_readl(TIMER_IRQSTAT_REG);
|
||
|
bcm_timer_writel(stat, TIMER_IRQSTAT_REG);
|
||
|
spin_unlock(&timer_reg_lock);
|
||
|
|
||
|
for (i = 0; i < BCM63XX_TIMER_COUNT; i++) {
|
||
|
if (!(stat & TIMER_IRQSTAT_TIMER_CAUSE(i)))
|
||
|
continue;
|
||
|
|
||
|
spin_lock(&timer_data_lock);
|
||
|
if (!timer_data[i].cb) {
|
||
|
spin_unlock(&timer_data_lock);
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
timer_data[i].cb(timer_data[i].data);
|
||
|
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;
|
||
|
|
||
|
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);
|
||
|
|
||
|
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;
|
||
|
|
||
|
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);
|
||
|
|
||
|
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;
|
||
|
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:
|
||
|
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;
|
||
|
|
||
|
spin_lock_irqsave(&timer_data_lock, flags);
|
||
|
timer_data[id].cb = NULL;
|
||
|
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;
|
||
|
|
||
|
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));
|
||
|
|
||
|
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);
|