u-boot/arch/riscv/lib/sbi_ipi.c
Sean Anderson 40686c394e 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>
2020-07-01 15:01:22 +08:00

42 lines
616 B
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 Fraunhofer AISEC,
* Lukas Auer <lukas.auer@aisec.fraunhofer.de>
*/
#include <common.h>
#include <asm/encoding.h>
#include <asm/sbi.h>
int riscv_init_ipi(void)
{
return 0;
}
int riscv_send_ipi(int hart)
{
ulong mask;
mask = 1UL << hart;
sbi_send_ipi(&mask);
return 0;
}
int riscv_clear_ipi(int hart)
{
csr_clear(CSR_SIP, SIP_SSIP);
return 0;
}
int riscv_get_ipi(int hart, int *pending)
{
/*
* The SBI does not support reading the IPI status. We always return 0
* to indicate that no IPI is pending.
*/
*pending = 0;
return 0;
}