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riscv: Enable cpu clock if it is present

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The cpu clock is probably already enabled if we are executing code (though
we could be executing from a different core). This patch prevents the cpu
clock or its parents from being disabled.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Sean Anderson 2020-06-24 06:41:22 -04:00 committed by Andes
parent ab24017a19
commit 627718626b
1 changed files with 20 additions and 0 deletions
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20
drivers/cpu/riscv_cpu.c
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@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
* Copyright (C) 2020, Sean Anderson <seanga2@gmail.com>
*/
#include <clk.h>
@ -119,6 +120,24 @@ static int riscv_cpu_bind(struct udevice *dev)
return 0;
}
static int riscv_cpu_probe(struct udevice *dev)
{
int ret = 0;
struct clk clk;
/* Get a clock if it exists */
ret = clk_get_by_index(dev, 0, &clk);
if (ret)
return 0;
ret = clk_enable(&clk);
clk_free(&clk);
if (ret == -ENOSYS || ret == -ENOTSUPP)
return 0;
else
return ret;
}
static const struct cpu_ops riscv_cpu_ops = {
.get_desc = riscv_cpu_get_desc,
.get_info = riscv_cpu_get_info,
@ -135,6 +154,7 @@ U_BOOT_DRIVER(riscv_cpu) = {
.id = UCLASS_CPU,
.of_match = riscv_cpu_ids,
.bind = riscv_cpu_bind,
.probe = riscv_cpu_probe,
.ops = &riscv_cpu_ops,
.flags = DM_FLAG_PRE_RELOC,
};