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plat: clint: Reduce use of atomic operation on IPI registers

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Currently, we aggresively use atomic operation on CLINT IPI
register. This patch simplify CLINT IPI APIs by reducing use
of atomic operations. In future, we will gradually increase
use of atomic operations for CLINT IPI APIs.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Anup Patel authored and Anup Patel committed 2018-12-16 13:51:16 +05:30
1 parent 385b5afe7d
commit 8a4088c3af
1 file changed
+4 -9
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plat/common/sys/clint.c
+4 -9
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@@ -22,8 +22,7 @@ void clint_ipi_inject(u32 target_hart, u32 source_hart)
return;
/* Set CLINT IPI */
__io_bw();
atomic_raw_xchg_uint(&clint_ipi[target_hart], 1);
writel(1, &clint_ipi[target_hart]);
}
void clint_ipi_sync(u32 target_hart, u32 source_hart)
@@ -41,15 +40,12 @@ void clint_ipi_sync(u32 target_hart, u32 source_hart)
if (!target_ipi)
break;
__io_bw();
incoming_ipi |=
atomic_raw_xchg_uint(&clint_ipi[source_hart], 0);
}
if (incoming_ipi) {
__io_bw();
atomic_raw_xchg_uint(&clint_ipi[source_hart], incoming_ipi);
}
if (incoming_ipi)
writel(incoming_ipi, &clint_ipi[source_hart]);
}
void clint_ipi_clear(u32 target_hart)
@@ -58,8 +54,7 @@ void clint_ipi_clear(u32 target_hart)
return;
/* Clear CLINT IPI */
__io_bw();
atomic_raw_xchg_uint(&clint_ipi[target_hart], 0);
writel(0, &clint_ipi[target_hart]);
}
int clint_warm_ipi_init(u32 target_hart)