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lib: utils/timer: Simplify MTIMER synchronization

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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>
This commit is contained in:
Anup Patel
2021-07-24 10:35:01 +05:30
committed by Anup Patel
parent b35f7826b0
commit 7aa6c9aa96
3 changed files with 83 additions and 33 deletions
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7
include/sbi_utils/timer/aclint_mtimer.h
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@@ -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,