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lib: sbi: Extends sbi_ipi_raw_send() to use all available IPI devices

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A platform may contain multiple IPI devices. In certain use cases,
such as power management, it may be necessary to send an IPI through a
specific device to wake up a CPU. For example, if an IMSIC is powered
down and reset, the core cannot receive IPIs from it, so the wake-up must
instead be triggered through the CLINT.

Suggested-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Nick Hu <nick.hu@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251020-cache-upstream-v7-8-69a132447d8a@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Nick Hu
2025-10-20 14:34:10 +08:00
committed by Anup Patel
parent c2d2b9140a
commit 94f0f84656
4 changed files with 16 additions and 6 deletions
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2
platform/generic/andes/ae350.c
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@@ -35,7 +35,7 @@ static int ae350_hart_start(u32 hartid, ulong saddr)
* 2) the target hart is non-sleepable 25-series hart0
*/
if (!sbi_init_count(hartindex) || (is_andes(25) && hartid == 0))
return sbi_ipi_raw_send(hartindex);
return sbi_ipi_raw_send(hartindex, false);
/* Write wakeup command to the sleep hart */
smu_set_command(&smu, WAKEUP_CMD, hartid);