| Message ID | 20181017134159.9656-5-m.szyprowski@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3,1/6] clocksource: exynos_mct: Remove dead code | expand |
Hi Marek, On 2018년 10월 17일 22:41, Marek Szyprowski wrote: > To get ARM Architected Timers working on Samsung Exynos SoCs, one has to > first configure and enable Exynos Multi-Core Timer, because they both > share some common hardware blocks (global system counter). This patch > adds a mode of cooperation with arch_timer driver, so kernel can use > CP15 based timer interface via arch_timer driver, which is mandatory > on ARM64. In such mode MCT driver only enables its clocks and starts > global timer. Everything else will be handled by arch_timer driver. > > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> > --- > drivers/clocksource/exynos_mct.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c > index 02ad55db390b..1b19a4f03929 100644 > --- a/drivers/clocksource/exynos_mct.c > +++ b/drivers/clocksource/exynos_mct.c > @@ -606,6 +606,15 @@ static int __init mct_init_dt(struct device_node *np, unsigned int int_type) > if (ret) > return ret; > > + if (IS_ENABLED(CONFIG_ARM64) && IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) { > + struct device_node *np = of_find_compatible_node(NULL, NULL, > + "arm,armv8-timer"); > + if (np) { > + of_node_put(np); > + exynos4_mct_frc_start(); > + return 0; > + } > + } > > ret = exynos4_timer_interrupts(np, int_type); > if (ret) > I tested it on Exynos5433-based TM2 board. Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c index 02ad55db390b..1b19a4f03929 100644 --- a/drivers/clocksource/exynos_mct.c +++ b/drivers/clocksource/exynos_mct.c @@ -606,6 +606,15 @@ static int __init mct_init_dt(struct device_node *np, unsigned int int_type) if (ret) return ret; + if (IS_ENABLED(CONFIG_ARM64) && IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) { + struct device_node *np = of_find_compatible_node(NULL, NULL, + "arm,armv8-timer"); + if (np) { + of_node_put(np); + exynos4_mct_frc_start(); + return 0; + } + } ret = exynos4_timer_interrupts(np, int_type); if (ret)
To get ARM Architected Timers working on Samsung Exynos SoCs, one has to first configure and enable Exynos Multi-Core Timer, because they both share some common hardware blocks (global system counter). This patch adds a mode of cooperation with arch_timer driver, so kernel can use CP15 based timer interface via arch_timer driver, which is mandatory on ARM64. In such mode MCT driver only enables its clocks and starts global timer. Everything else will be handled by arch_timer driver. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> --- drivers/clocksource/exynos_mct.c | 9 +++++++++ 1 file changed, 9 insertions(+)