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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207/* * 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);