[PATCH 5/9] clocksource/drivers/lpc32xx: Support timer-based ARM delay
From: Daniel Lezcano <hidden>
Date: 2016-02-25 13:39:30
Also in:
lkml
Subsystem:
clocksource, clockevent drivers, the rest · Maintainers:
Daniel Lezcano, Thomas Gleixner, Linus Torvalds
From: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> 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 <redacted> Reviewed-by: Joachim Eastwood <redacted> Tested-by: Joachim Eastwood <redacted> --- drivers/clocksource/Kconfig | 1 + drivers/clocksource/time-lpc32xx.c | 12 ++++++++++++ 2 files changed, 13 insertions(+)
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 56777f0..c9c4db6 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 5694edd..daae61e 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;
--
1.9.1