mirror of https://gitee.com/openkylin/linux.git
45 lines
945 B
C
45 lines
945 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2019 Christoph Hellwig.
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*/
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#include <linux/io.h>
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#include <linux/of_address.h>
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#include <linux/types.h>
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#include <asm/clint.h>
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#include <asm/csr.h>
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#include <asm/timex.h>
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#include <asm/smp.h>
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/*
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* This is the layout used by the SiFive clint, which is also shared by the qemu
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* virt platform, and the Kendryte KD210 at least.
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*/
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#define CLINT_IPI_OFF 0
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#define CLINT_TIME_CMP_OFF 0x4000
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#define CLINT_TIME_VAL_OFF 0xbff8
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u32 __iomem *clint_ipi_base;
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void clint_init_boot_cpu(void)
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{
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struct device_node *np;
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void __iomem *base;
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np = of_find_compatible_node(NULL, NULL, "riscv,clint0");
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if (!np) {
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panic("clint not found");
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return;
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}
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base = of_iomap(np, 0);
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if (!base)
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panic("could not map CLINT");
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clint_ipi_base = base + CLINT_IPI_OFF;
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riscv_time_cmp = base + CLINT_TIME_CMP_OFF;
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riscv_time_val = base + CLINT_TIME_VAL_OFF;
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clint_clear_ipi(boot_cpu_hartid);
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}
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