From 1b18fd2023acf7679a79d94ee85d488664ef0553 Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Tue, 9 Feb 2016 22:54:27 -0300 Subject: [PATCH] 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 Signed-off-by: Daniel Lezcano Reviewed-by: Joachim Eastwood Tested-by: Joachim Eastwood --- 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 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 #include #include +#include #include #include #include @@ -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; -- 2.20.1