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| author | Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> | 2016-02-09 22:54:27 -0300 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2016-02-25 14:33:58 +0100 |
| commit | 1b18fd2023acf7679a79d94ee85d488664ef0553 (patch) | |
| tree | 80c58a213552e2cd5bc1e768d8e74712db3e6344 /drivers/clocksource | |
| parent | 32f32d982f655dd191858406b11e50219a0ee01e (diff) | |
| download | lwn-1b18fd2023acf7679a79d94ee85d488664ef0553.tar.gz lwn-1b18fd2023acf7679a79d94ee85d488664ef0553.zip | |
clocksource/drivers/lpc32xx: Support timer-based ARM delay
This commit implements the ARM timer-based delay timer for the
LPC32xx, LPC18xx, LPC43xx family of SoCs.
Also, add a dependency to restrict compiling this driver for
the ARM architecture.
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Joachim Eastwood <manabian@gmail.com>
Tested-by: Joachim Eastwood <manabian@gmail.com>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/clocksource/time-lpc32xx.c | 12 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 56777f04d2d9..c9c4db6c2797 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -153,6 +153,7 @@ config CLKSRC_EFM32 config CLKSRC_LPC32XX bool "Clocksource for LPC32XX" if COMPILE_TEST depends on GENERIC_CLOCKEVENTS && HAS_IOMEM + depends on ARM select CLKSRC_MMIO select CLKSRC_OF help diff --git a/drivers/clocksource/time-lpc32xx.c b/drivers/clocksource/time-lpc32xx.c index 5694eddade15..daae61e8c820 100644 --- a/drivers/clocksource/time-lpc32xx.c +++ b/drivers/clocksource/time-lpc32xx.c @@ -18,6 +18,7 @@ #include <linux/clk.h> #include <linux/clockchips.h> #include <linux/clocksource.h> +#include <linux/delay.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/kernel.h> @@ -54,6 +55,15 @@ static u64 notrace lpc32xx_read_sched_clock(void) return readl(clocksource_timer_counter); } +static unsigned long lpc32xx_delay_timer_read(void) +{ + return readl(clocksource_timer_counter); +} + +static struct delay_timer lpc32xx_delay_timer = { + .read_current_timer = lpc32xx_delay_timer_read, +}; + static int lpc32xx_clkevt_next_event(unsigned long delta, struct clock_event_device *evtdev) { @@ -192,6 +202,8 @@ static int __init lpc32xx_clocksource_init(struct device_node *np) } clocksource_timer_counter = base + LPC32XX_TIMER_TC; + lpc32xx_delay_timer.freq = rate; + register_current_timer_delay(&lpc32xx_delay_timer); sched_clock_register(lpc32xx_read_sched_clock, 32, rate); return 0; |