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206 lines
4.4 KiB
206 lines
4.4 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 2008 Maxime Bizon <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/export.h> |
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#include <linux/spinlock.h> |
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#include <linux/interrupt.h> |
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#include <linux/clk.h> |
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#include <bcm63xx_cpu.h> |
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#include <bcm63xx_io.h> |
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#include <bcm63xx_timer.h> |
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#include <bcm63xx_regs.h> |
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static DEFINE_RAW_SPINLOCK(timer_reg_lock); |
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static DEFINE_RAW_SPINLOCK(timer_data_lock); |
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static struct clk *periph_clk; |
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static struct timer_data { |
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void (*cb)(void *); |
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void *data; |
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} timer_data[BCM63XX_TIMER_COUNT]; |
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static irqreturn_t timer_interrupt(int irq, void *dev_id) |
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{ |
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u32 stat; |
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int i; |
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raw_spin_lock(&timer_reg_lock); |
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stat = bcm_timer_readl(TIMER_IRQSTAT_REG); |
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bcm_timer_writel(stat, TIMER_IRQSTAT_REG); |
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raw_spin_unlock(&timer_reg_lock); |
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for (i = 0; i < BCM63XX_TIMER_COUNT; i++) { |
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if (!(stat & TIMER_IRQSTAT_TIMER_CAUSE(i))) |
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continue; |
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raw_spin_lock(&timer_data_lock); |
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if (!timer_data[i].cb) { |
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raw_spin_unlock(&timer_data_lock); |
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continue; |
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} |
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timer_data[i].cb(timer_data[i].data); |
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raw_spin_unlock(&timer_data_lock); |
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} |
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return IRQ_HANDLED; |
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} |
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int bcm63xx_timer_enable(int id) |
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{ |
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u32 reg; |
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unsigned long flags; |
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if (id >= BCM63XX_TIMER_COUNT) |
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return -EINVAL; |
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raw_spin_lock_irqsave(&timer_reg_lock, flags); |
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reg = bcm_timer_readl(TIMER_CTLx_REG(id)); |
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reg |= TIMER_CTL_ENABLE_MASK; |
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bcm_timer_writel(reg, TIMER_CTLx_REG(id)); |
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reg = bcm_timer_readl(TIMER_IRQSTAT_REG); |
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reg |= TIMER_IRQSTAT_TIMER_IR_EN(id); |
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bcm_timer_writel(reg, TIMER_IRQSTAT_REG); |
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raw_spin_unlock_irqrestore(&timer_reg_lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL(bcm63xx_timer_enable); |
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int bcm63xx_timer_disable(int id) |
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{ |
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u32 reg; |
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unsigned long flags; |
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if (id >= BCM63XX_TIMER_COUNT) |
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return -EINVAL; |
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raw_spin_lock_irqsave(&timer_reg_lock, flags); |
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reg = bcm_timer_readl(TIMER_CTLx_REG(id)); |
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reg &= ~TIMER_CTL_ENABLE_MASK; |
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bcm_timer_writel(reg, TIMER_CTLx_REG(id)); |
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reg = bcm_timer_readl(TIMER_IRQSTAT_REG); |
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reg &= ~TIMER_IRQSTAT_TIMER_IR_EN(id); |
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bcm_timer_writel(reg, TIMER_IRQSTAT_REG); |
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raw_spin_unlock_irqrestore(&timer_reg_lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL(bcm63xx_timer_disable); |
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int bcm63xx_timer_register(int id, void (*callback)(void *data), void *data) |
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{ |
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unsigned long flags; |
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int ret; |
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if (id >= BCM63XX_TIMER_COUNT || !callback) |
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return -EINVAL; |
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ret = 0; |
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raw_spin_lock_irqsave(&timer_data_lock, flags); |
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if (timer_data[id].cb) { |
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ret = -EBUSY; |
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goto out; |
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} |
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timer_data[id].cb = callback; |
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timer_data[id].data = data; |
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out: |
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raw_spin_unlock_irqrestore(&timer_data_lock, flags); |
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return ret; |
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} |
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EXPORT_SYMBOL(bcm63xx_timer_register); |
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void bcm63xx_timer_unregister(int id) |
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{ |
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unsigned long flags; |
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if (id >= BCM63XX_TIMER_COUNT) |
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return; |
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raw_spin_lock_irqsave(&timer_data_lock, flags); |
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timer_data[id].cb = NULL; |
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raw_spin_unlock_irqrestore(&timer_data_lock, flags); |
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} |
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EXPORT_SYMBOL(bcm63xx_timer_unregister); |
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unsigned int bcm63xx_timer_countdown(unsigned int countdown_us) |
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{ |
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return (clk_get_rate(periph_clk) / (1000 * 1000)) * countdown_us; |
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} |
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EXPORT_SYMBOL(bcm63xx_timer_countdown); |
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int bcm63xx_timer_set(int id, int monotonic, unsigned int countdown_us) |
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{ |
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u32 reg, countdown; |
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unsigned long flags; |
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if (id >= BCM63XX_TIMER_COUNT) |
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return -EINVAL; |
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countdown = bcm63xx_timer_countdown(countdown_us); |
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if (countdown & ~TIMER_CTL_COUNTDOWN_MASK) |
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return -EINVAL; |
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raw_spin_lock_irqsave(&timer_reg_lock, flags); |
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reg = bcm_timer_readl(TIMER_CTLx_REG(id)); |
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if (monotonic) |
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reg &= ~TIMER_CTL_MONOTONIC_MASK; |
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else |
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reg |= TIMER_CTL_MONOTONIC_MASK; |
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reg &= ~TIMER_CTL_COUNTDOWN_MASK; |
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reg |= countdown; |
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bcm_timer_writel(reg, TIMER_CTLx_REG(id)); |
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raw_spin_unlock_irqrestore(&timer_reg_lock, flags); |
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return 0; |
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} |
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EXPORT_SYMBOL(bcm63xx_timer_set); |
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int bcm63xx_timer_init(void) |
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{ |
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int ret, irq; |
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u32 reg; |
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reg = bcm_timer_readl(TIMER_IRQSTAT_REG); |
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reg &= ~TIMER_IRQSTAT_TIMER0_IR_EN; |
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reg &= ~TIMER_IRQSTAT_TIMER1_IR_EN; |
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reg &= ~TIMER_IRQSTAT_TIMER2_IR_EN; |
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bcm_timer_writel(reg, TIMER_IRQSTAT_REG); |
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periph_clk = clk_get(NULL, "periph"); |
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if (IS_ERR(periph_clk)) |
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return -ENODEV; |
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irq = bcm63xx_get_irq_number(IRQ_TIMER); |
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ret = request_irq(irq, timer_interrupt, 0, "bcm63xx_timer", NULL); |
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if (ret) { |
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pr_err("%s: failed to register irq\n", __func__); |
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return ret; |
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} |
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return 0; |
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} |
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arch_initcall(bcm63xx_timer_init);
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