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authorZhen Lei <thunder.leizhen@huawei.com>2020-09-18 16:22:36 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2020-09-24 11:51:04 +0300
commit549437a43f45ce70cf5012317633c635c43ba4f4 (patch)
treea1d1a8deafd03c00822cd56fbe0d99cf6314f13f /drivers/clocksource/timer-sp804.c
parentbd5a1936ffa2b69032815775fa54fc1c422d49d5 (diff)
downloadlinux-549437a43f45ce70cf5012317633c635c43ba4f4.tar.xz
clocksource/drivers/sp804: Enable Hisilicon sp804 timer 64bit mode
A 100MHZ 32-bit timer will be wrapped up less than 43s. Although the kernel maintains a software high 32-bit count in the tick IRQ. But it's not applicable to the user mode APPs. Note: The kernel still uses the lower 32 bits of the timer. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200918132237.3552-9-thunder.leizhen@huawei.com
Diffstat (limited to 'drivers/clocksource/timer-sp804.c')
-rw-r--r--drivers/clocksource/timer-sp804.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/clocksource/timer-sp804.c b/drivers/clocksource/timer-sp804.c
index f0783d19522f..6e8ad4a4ea3c 100644
--- a/drivers/clocksource/timer-sp804.c
+++ b/drivers/clocksource/timer-sp804.c
@@ -24,12 +24,15 @@
#define HISI_TIMER_1_BASE 0x00
#define HISI_TIMER_2_BASE 0x40
#define HISI_TIMER_LOAD 0x00
+#define HISI_TIMER_LOAD_H 0x04
#define HISI_TIMER_VALUE 0x08
+#define HISI_TIMER_VALUE_H 0x0c
#define HISI_TIMER_CTRL 0x10
#define HISI_TIMER_INTCLR 0x14
#define HISI_TIMER_RIS 0x18
#define HISI_TIMER_MIS 0x1c
#define HISI_TIMER_BGLOAD 0x20
+#define HISI_TIMER_BGLOAD_H 0x24
struct sp804_timer __initdata arm_sp804_timer = {
@@ -43,7 +46,9 @@ struct sp804_timer __initdata arm_sp804_timer = {
struct sp804_timer __initdata hisi_sp804_timer = {
.load = HISI_TIMER_LOAD,
+ .load_h = HISI_TIMER_LOAD_H,
.value = HISI_TIMER_VALUE,
+ .value_h = HISI_TIMER_VALUE_H,
.ctrl = HISI_TIMER_CTRL,
.intclr = HISI_TIMER_INTCLR,
.timer_base = {HISI_TIMER_1_BASE, HISI_TIMER_2_BASE},
@@ -129,6 +134,10 @@ int __init sp804_clocksource_and_sched_clock_init(void __iomem *base,
writel(0, clkevt->ctrl);
writel(0xffffffff, clkevt->load);
writel(0xffffffff, clkevt->value);
+ if (clkevt->width == 64) {
+ writel(0xffffffff, clkevt->load_h);
+ writel(0xffffffff, clkevt->value_h);
+ }
writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
clkevt->ctrl);
@@ -245,7 +254,9 @@ static void __init sp804_clkevt_init(struct sp804_timer *timer, void __iomem *ba
clkevt = &sp804_clkevt[i];
clkevt->base = timer_base;
clkevt->load = timer_base + timer->load;
+ clkevt->load_h = timer_base + timer->load_h;
clkevt->value = timer_base + timer->value;
+ clkevt->value_h = timer_base + timer->value_h;
clkevt->ctrl = timer_base + timer->ctrl;
clkevt->intclr = timer_base + timer->intclr;
clkevt->width = timer->width;