提交 1b18fd20 编写于 作者: E Ezequiel Garcia 提交者: Daniel Lezcano

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: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: NJoachim Eastwood <manabian@gmail.com>
Tested-by: NJoachim Eastwood <manabian@gmail.com>
上级 32f32d98
......@@ -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
......
......@@ -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;
......
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