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40686c394e
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>
43 lines
616 B
C
43 lines
616 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 Fraunhofer AISEC,
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* Lukas Auer <lukas.auer@aisec.fraunhofer.de>
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*/
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#include <common.h>
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#include <asm/encoding.h>
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#include <asm/sbi.h>
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int riscv_init_ipi(void)
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{
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return 0;
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}
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int riscv_send_ipi(int hart)
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{
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ulong mask;
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mask = 1UL << hart;
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sbi_send_ipi(&mask);
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return 0;
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}
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int riscv_clear_ipi(int hart)
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{
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csr_clear(CSR_SIP, SIP_SSIP);
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return 0;
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}
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int riscv_get_ipi(int hart, int *pending)
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{
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/*
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* The SBI does not support reading the IPI status. We always return 0
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* to indicate that no IPI is pending.
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*/
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*pending = 0;
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return 0;
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}
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