diff options
Diffstat (limited to 'drivers/clocksource/timer-atmel-st.c')
| -rw-r--r-- | drivers/clocksource/timer-atmel-st.c | 94 |
1 files changed, 35 insertions, 59 deletions
diff --git a/drivers/clocksource/timer-atmel-st.c b/drivers/clocksource/timer-atmel-st.c index 7d062ab32674..674ef2519d6b 100644 --- a/drivers/clocksource/timer-atmel-st.c +++ b/drivers/clocksource/timer-atmel-st.c @@ -24,18 +24,19 @@ #include <linux/irq.h> #include <linux/clockchips.h> #include <linux/export.h> -#include <linux/of.h> -#include <linux/of_address.h> +#include <linux/mfd/syscon.h> +#include <linux/mfd/syscon/atmel-st.h> #include <linux/of_irq.h> +#include <linux/regmap.h> #include <asm/mach/time.h> -#include <mach/at91_st.h> #include <mach/hardware.h> static unsigned long last_crtr; static u32 irqmask; static struct clock_event_device clkevt; +static struct regmap *regmap_st; #define RM9200_TIMER_LATCH ((AT91_SLOW_CLOCK + HZ/2) / HZ) @@ -46,11 +47,11 @@ static struct clock_event_device clkevt; */ static inline unsigned long read_CRTR(void) { - unsigned long x1, x2; + unsigned int x1, x2; - x1 = at91_st_read(AT91_ST_CRTR); + regmap_read(regmap_st, AT91_ST_CRTR, &x1); do { - x2 = at91_st_read(AT91_ST_CRTR); + regmap_read(regmap_st, AT91_ST_CRTR, &x2); if (x1 == x2) break; x1 = x2; @@ -63,7 +64,10 @@ static inline unsigned long read_CRTR(void) */ static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id) { - u32 sr = at91_st_read(AT91_ST_SR) & irqmask; + u32 sr; + + regmap_read(regmap_st, AT91_ST_SR, &sr); + sr &= irqmask; /* * irqs should be disabled here, but as the irq is shared they are only @@ -115,23 +119,25 @@ static struct clocksource clk32k = { static void clkevt32k_mode(enum clock_event_mode mode, struct clock_event_device *dev) { + unsigned int val; + /* Disable and flush pending timer interrupts */ - at91_st_write(AT91_ST_IDR, AT91_ST_PITS | AT91_ST_ALMS); - at91_st_read(AT91_ST_SR); + regmap_write(regmap_st, AT91_ST_IDR, AT91_ST_PITS | AT91_ST_ALMS); + regmap_read(regmap_st, AT91_ST_SR, &val); last_crtr = read_CRTR(); switch (mode) { case CLOCK_EVT_MODE_PERIODIC: /* PIT for periodic irqs; fixed rate of 1/HZ */ irqmask = AT91_ST_PITS; - at91_st_write(AT91_ST_PIMR, RM9200_TIMER_LATCH); + regmap_write(regmap_st, AT91_ST_PIMR, RM9200_TIMER_LATCH); break; case CLOCK_EVT_MODE_ONESHOT: /* ALM for oneshot irqs, set by next_event() * before 32 seconds have passed */ irqmask = AT91_ST_ALMS; - at91_st_write(AT91_ST_RTAR, last_crtr); + regmap_write(regmap_st, AT91_ST_RTAR, last_crtr); break; case CLOCK_EVT_MODE_SHUTDOWN: case CLOCK_EVT_MODE_UNUSED: @@ -139,7 +145,7 @@ clkevt32k_mode(enum clock_event_mode mode, struct clock_event_device *dev) irqmask = 0; break; } - at91_st_write(AT91_ST_IER, irqmask); + regmap_write(regmap_st, AT91_ST_IER, irqmask); } static int @@ -147,6 +153,7 @@ clkevt32k_next_event(unsigned long delta, struct clock_event_device *dev) { u32 alm; int status = 0; + unsigned int val; BUG_ON(delta < 2); @@ -162,12 +169,12 @@ clkevt32k_next_event(unsigned long delta, struct clock_event_device *dev) alm = read_CRTR(); /* Cancel any pending alarm; flush any pending IRQ */ - at91_st_write(AT91_ST_RTAR, alm); - at91_st_read(AT91_ST_SR); + regmap_write(regmap_st, AT91_ST_RTAR, alm); + regmap_read(regmap_st, AT91_ST_SR, &val); /* Schedule alarm by writing RTAR. */ alm += delta; - at91_st_write(AT91_ST_RTAR, alm); + regmap_write(regmap_st, AT91_ST_RTAR, alm); return status; } @@ -180,57 +187,26 @@ static struct clock_event_device clkevt = { .set_mode = clkevt32k_mode, }; -void __iomem *at91_st_base; -EXPORT_SYMBOL_GPL(at91_st_base); - -static const struct of_device_id at91rm9200_st_timer_ids[] = { - { .compatible = "atmel,at91rm9200-st" }, - { /* sentinel */ } -}; - -static int __init of_at91rm9200_st_init(void) -{ - struct device_node *np; - int ret; - - np = of_find_matching_node(NULL, at91rm9200_st_timer_ids); - if (!np) - goto err; - - at91_st_base = of_iomap(np, 0); - if (!at91_st_base) - goto node_err; - - /* Get the interrupts property */ - ret = irq_of_parse_and_map(np, 0); - if (!ret) - goto ioremap_err; - at91rm9200_timer_irq.irq = ret; - - of_node_put(np); - - return 0; - -ioremap_err: - iounmap(at91_st_base); -node_err: - of_node_put(np); -err: - return -EINVAL; -} - /* * ST (system timer) module supports both clockevents and clocksource. */ static void __init atmel_st_timer_init(struct device_node *node) { - /* For device tree enabled device: initialize here */ - of_at91rm9200_st_init(); + unsigned int val; + + regmap_st = syscon_node_to_regmap(node); + if (IS_ERR(regmap_st)) + panic(pr_fmt("Unable to get regmap\n")); /* Disable all timer interrupts, and clear any pending ones */ - at91_st_write(AT91_ST_IDR, + regmap_write(regmap_st, AT91_ST_IDR, AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS); - at91_st_read(AT91_ST_SR); + regmap_read(regmap_st, AT91_ST_SR, &val); + + /* Get the interrupts property */ + at91rm9200_timer_irq.irq = irq_of_parse_and_map(node, 0); + if (!at91rm9200_timer_irq.irq) + panic(pr_fmt("Unable to get IRQ from DT\n")); /* Make IRQs happen for the system timer */ setup_irq(at91rm9200_timer_irq.irq, &at91rm9200_timer_irq); @@ -239,7 +215,7 @@ static void __init atmel_st_timer_init(struct device_node *node) * directly for the clocksource and all clockevents, after adjusting * its prescaler from the 1 Hz default. */ - at91_st_write(AT91_ST_RTMR, 1); + regmap_write(regmap_st, AT91_ST_RTMR, 1); /* Setup timer clockevent, with minimum of two ticks (important!!) */ clkevt.cpumask = cpumask_of(0); |