riscv: Clean up IPI initialization code

The previous IPI code initialized the device whenever the first call was
made to a riscv_*_ipi function. This made it difficult to determine when
the IPI device was initialized. This patch introduces a new function
riscv_init_ipi. It is called once during arch_cpu_init_dm. In SPL, it is
called in spl_invoke_opensbi. Before this point, no riscv_*_ipi functions
should be called.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/riscv/lib/sbi_ipi.c b/arch/riscv/lib/sbi_ipi.c
index abafca9e5c..d02e2b4c48 100644
--- a/arch/riscv/lib/sbi_ipi.c
+++ b/arch/riscv/lib/sbi_ipi.c
@@ -8,6 +8,11 @@
 #include <asm/encoding.h>
 #include <asm/sbi.h>
 
+int riscv_init_ipi(void)
+{
+	return 0;
+}
+
 int riscv_send_ipi(int hart)
 {
 	ulong mask;