From 7aa6c9aa96049b741b754b7340ea96a37719de27 Mon Sep 17 00:00:00 2001
From: Anup Patel <anup.patel@wdc.com>
Date: Sat, 24 Jul 2021 10:35:01 +0530
Subject: lib: utils/timer: Simplify MTIMER synchronization
We simplify MTIMER synchronization as follows:
1) Detect MTIMER devices with unique (or non-shared) MTIME
register at boot-time
2) Select first MTIMER device with no associated HART as our
reference MTIMER device
3) Only synchronize MTIMER devices with unique (or non-shared)
MTIME register using reference MTIMER device
4) Directly update the MTIME register at time of synchronization
because MTIME is a read/write register.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
---
include/sbi_utils/timer/aclint_mtimer.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
(limited to 'include')
diff --git a/include/sbi_utils/timer/aclint_mtimer.h b/include/sbi_utils/timer/aclint_mtimer.h
index fdc46cd..a9fe445 100644
--- a/include/sbi_utils/timer/aclint_mtimer.h
+++ b/include/sbi_utils/timer/aclint_mtimer.h
@@ -31,14 +31,19 @@ struct aclint_mtimer_data {
u32 first_hartid;
u32 hart_count;
bool has_64bit_mmio;
+ bool has_shared_mtime;
/* Private details (initialized and used by ACLINT MTIMER library) */
struct aclint_mtimer_data *time_delta_reference;
unsigned long time_delta_computed;
- u64 time_delta;
u64 (*time_rd)(volatile u64 *addr);
void (*time_wr)(bool timecmp, u64 value, volatile u64 *addr);
};
+void aclint_mtimer_sync(struct aclint_mtimer_data *mt);
+
+void aclint_mtimer_set_reference(struct aclint_mtimer_data *mt,
+ struct aclint_mtimer_data *ref);
+
int aclint_mtimer_warm_init(void);
int aclint_mtimer_cold_init(struct aclint_mtimer_data *mt,
--
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