void __init mxc_timer_init(struct clk *timer_clk, void __iomem *base, int irq)
{
uint32_t tctl_val;
clk_enable(timer_clk);
timer_base = base;
__raw_writel(0, timer_base + MXC_TCTL);
__raw_writel(0, timer_base + MXC_TPRER);
if (cpu_is_mx3() || cpu_is_mx25())
tctl_val = MX3_TCTL_CLK_IPG | MX3_TCTL_FRR | MX3_TCTL_WAITEN | MXC_TCTL_TEN;
else
tctl_val = MX1_2_TCTL_FRR | MX1_2_TCTL_CLK_PCLK1 | MXC_TCTL_TEN;
__raw_writel(tctl_val, timer_base + MXC_TCTL);
mxc_clocksource_init(timer_clk);
mxc_clockevent_init(timer_clk);
setup_irq(irq, &mxc_timer_irq);
}
static void mxc_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
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 */
gpt_irq_disable();
if (mode != clockevent_mode) {
/* Set event time into far-far future */
if (cpu_is_mx3())
__raw_writel(__raw_readl(timer_base + MX3_TCN) - 3,
timer_base + MX3_TCMP);
else
__raw_writel(__raw_readl(timer_base + MX1_2_TCN) - 3,
timer_base + MX1_2_TCMP);
/* Clear pending interrupt */
gpt_irq_acknowledge();
}
#ifdef DEBUG
printk(KERN_INFO "mxc_set_mode: changing mode from %s to %s\n",
clock_event_mode_label[clockevent_mode],
clock_event_mode_label[mode]);
#endif /* DEBUG */
/* Remember timer mode */
clockevent_mode = mode;
local_irq_restore(flags);
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
printk(KERN_ERR"mxc_set_mode: Periodic mode is not "
"supported for i.MX\n");
break;
case CLOCK_EVT_MODE_ONESHOT:
/*
* 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
*/
local_irq_save(flags);
gpt_irq_enable();
local_irq_restore(flags);
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_RESUME:
/* Left event sources disabled, no more interrupts appear */
break;
}
}
void __init mxc_timer_init(struct clk *timer_clk)
{
uint32_t tctl_val;
int irq;
clk_enable(timer_clk);
if (cpu_is_mx1()) {
#ifdef CONFIG_ARCH_MX1
timer_base = IO_ADDRESS(TIM1_BASE_ADDR);
irq = TIM1_INT;
#endif
} else if (cpu_is_mx2()) {
#ifdef CONFIG_ARCH_MX2
timer_base = IO_ADDRESS(GPT1_BASE_ADDR);
irq = MXC_INT_GPT1;
#endif
} else if (cpu_is_mx3()) {
#ifdef CONFIG_ARCH_MX3
timer_base = IO_ADDRESS(GPT1_BASE_ADDR);
irq = MXC_INT_GPT;
#endif
} else
BUG();
/*
* Initialise to a known state (all timers off, and timing reset)
*/
__raw_writel(0, timer_base + MXC_TCTL);
__raw_writel(0, timer_base + MXC_TPRER); /* see datasheet note */
if (cpu_is_mx3())
tctl_val = MX3_TCTL_CLK_IPG | MX3_TCTL_FRR | MX3_TCTL_WAITEN | MXC_TCTL_TEN;
else
tctl_val = MX1_2_TCTL_FRR | MX1_2_TCTL_CLK_PCLK1 | MXC_TCTL_TEN;
__raw_writel(tctl_val, timer_base + MXC_TCTL);
/* init and register the timer to the framework */
mxc_clocksource_init(timer_clk);
mxc_clockevent_init(timer_clk);
/* Make irqs happen */
setup_irq(irq, &mxc_timer_irq);
}
static void gpt_irq_acknowledge(void)
{
if (cpu_is_mx1())
__raw_writel(0, timer_base + MX1_2_TSTAT);
if (cpu_is_mx2())
__raw_writel(MX2_TSTAT_CAPT | MX2_TSTAT_COMP, timer_base + MX1_2_TSTAT);
if (cpu_is_mx3() || cpu_is_mx25())
__raw_writel(MX3_TSTAT_OF1, timer_base + MX3_TSTAT);
}
static inline void gpt_irq_enable(void)
{
if (cpu_is_mx3() || cpu_is_mx25())
__raw_writel(1<<0, timer_base + MX3_IR);
else {
__raw_writel(__raw_readl(timer_base + MXC_TCTL) | MX1_2_TCTL_IRQEN,
timer_base + MXC_TCTL);
}
}
static inline void gpt_irq_disable(void)
{
unsigned int tmp;
if (cpu_is_mx3() || cpu_is_mx25())
__raw_writel(0, timer_base + MX3_IR);
else {
tmp = __raw_readl(timer_base + MXC_TCTL);
__raw_writel(tmp & ~MX1_2_TCTL_IRQEN, timer_base + MXC_TCTL);
}
}
static void mxc_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
unsigned long flags;
local_irq_save(flags);
gpt_irq_disable();
if (mode != clockevent_mode) {
if (cpu_is_mx3() || cpu_is_mx25())
__raw_writel(__raw_readl(timer_base + MX3_TCN) - 3,
timer_base + MX3_TCMP);
else
__raw_writel(__raw_readl(timer_base + MX1_2_TCN) - 3,
timer_base + MX1_2_TCMP);
gpt_irq_acknowledge();
}
#ifdef DEBUG
printk(KERN_INFO "mxc_set_mode: changing mode from %s to %s\n",
clock_event_mode_label[clockevent_mode],
clock_event_mode_label[mode]);
#endif
clockevent_mode = mode;
local_irq_restore(flags);
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
printk(KERN_ERR"mxc_set_mode: Periodic mode is not "
"supported for i.MX\n");
break;
case CLOCK_EVT_MODE_ONESHOT:
local_irq_save(flags);
gpt_irq_enable();
local_irq_restore(flags);
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_RESUME:
break;
}
}
static int __init mxc_clocksource_init(struct clk *timer_clk)
{
unsigned int c = clk_get_rate(timer_clk);
if (cpu_is_mx3() || cpu_is_mx25())
clocksource_mxc.read = mx3_get_cycles;
clocksource_mxc.mult = clocksource_hz2mult(c,
clocksource_mxc.shift);
clocksource_register(&clocksource_mxc);
return 0;
}
static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = &clockevent_mxc;
uint32_t tstat;
if (cpu_is_mx3() || cpu_is_mx25())
tstat = __raw_readl(timer_base + MX3_TSTAT);
else
tstat = __raw_readl(timer_base + MX1_2_TSTAT);
gpt_irq_acknowledge();
evt->event_handler(evt);
return IRQ_HANDLED;
}
static int __init mxc_clockevent_init(struct clk *timer_clk)
{
unsigned int c = clk_get_rate(timer_clk);
if (cpu_is_mx3() || cpu_is_mx25())
clockevent_mxc.set_next_event = mx3_set_next_event;
clockevent_mxc.mult = div_sc(c, NSEC_PER_SEC,
clockevent_mxc.shift);
clockevent_mxc.max_delta_ns =
clockevent_delta2ns(0xfffffffe, &clockevent_mxc);
clockevent_mxc.min_delta_ns =
clockevent_delta2ns(0xff, &clockevent_mxc);
clockevent_mxc.cpumask = cpumask_of(0);
clockevents_register_device(&clockevent_mxc);
return 0;
}
