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riscv: Do some basic architecture level cpu initialization

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In arch_cpu_init_dm() do some basic architecture level cpu
initialization, like FPU enable, etc.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Bin Meng 2018-12-12 06:12:40 -08:00 committed by Andes
parent 57fe5c64cb
commit 485e822346
1 changed files with 26 additions and 1 deletions
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27
arch/riscv/cpu/cpu.c
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@ -8,6 +8,7 @@
#include <dm.h>
#include <log.h>
#include <asm/csr.h>
#include <asm/encoding.h>
#include <dm/uclass-internal.h>
/*
@ -61,7 +62,31 @@ static int riscv_cpu_probe(void)
int arch_cpu_init_dm(void)
{
return riscv_cpu_probe();
int ret;
ret = riscv_cpu_probe();
if (ret)
return ret;
/* Enable FPU */
if (supports_extension('d') || supports_extension('f')) {
csr_set(MODE_PREFIX(status), MSTATUS_FS);
csr_write(fcsr, 0);
}
if (CONFIG_IS_ENABLED(RISCV_MMODE)) {
/*
* Enable perf counters for cycle, time,
* and instret counters only
*/
csr_write(mcounteren, GENMASK(2, 0));
/* Disable paging */
if (supports_extension('s'))
csr_write(satp, 0);
}
return 0;
}
int arch_early_init_r(void)