Source of timer-imx-gpt.c - linux-imx - PHYTEC BitBucket (Stash)

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    writel_relaxed(tcmp, imxtm->base + V2_TCMP);
​
    return evt < 0x7fffffff &&
        (int)(tcmp - readl_relaxed(imxtm->base + V2_TCN)) < 0 ?
                -ETIME : 0;
}
​
static int mxc_shutdown(struct clock_event_device *ced)
{
    struct imx_timer *imxtm = to_imx_timer(ced);
    unsigned long flags;
    u32 tcn;
​
    /*
     * The timer interrupt generation is disabled at least
     * for enough time to call mxc_set_next_event()
     */
    local_irq_save(flags);
​
    /* Disable interrupt in GPT module */
    imxtm->gpt->gpt_irq_disable(imxtm);
​
    tcn = readl_relaxed(imxtm->base + imxtm->gpt->reg_tcn);
    /* Set event time into far-far future */
    writel_relaxed(tcn - 3, imxtm->base + imxtm->gpt->reg_tcmp);
​
    /* Clear pending interrupt */
    imxtm->gpt->gpt_irq_acknowledge(imxtm);
​
#ifdef DEBUG
    printk(KERN_INFO "%s: changing mode\n", __func__);
#endif /* DEBUG */
​
    local_irq_restore(flags);
​
    return 0;
}
​
static int mxc_set_oneshot(struct clock_event_device *ced)
{
    struct imx_timer *imxtm = to_imx_timer(ced);
    unsigned long flags;
​
    /*
     * The timer interrupt generation is disabled at least
     * for enough time to call mxc_set_next_event()
     */
    local_irq_save(flags);
​
    /* Disable interrupt in GPT module */
    imxtm->gpt->gpt_irq_disable(imxtm);
​
    if (!clockevent_state_oneshot(ced)) {
        u32 tcn = readl_relaxed(imxtm->base + imxtm->gpt->reg_tcn);
        /* Set event time into far-far future */
        writel_relaxed(tcn - 3, imxtm->base + imxtm->gpt->reg_tcmp);
​
        /* Clear pending interrupt */
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    printk(KERN_INFO "%s: changing mode\n", __func__);
#endif /* DEBUG */
​
    /*
     * Do not put overhead of interrupt enable/disable into
     * mxc_set_next_event(), the core has about 4 minutes
     * to call mxc_set_next_event() or shutdown clock after
     * mode switching
     */
    imxtm->gpt->gpt_irq_enable(imxtm);
    local_irq_restore(flags);
​
    return 0;
}
​
/*
 * IRQ handler for the timer
 */
static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
{
    struct clock_event_device *ced = dev_id;