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platform: generic: Add system suspend test

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When the system-suspend-test property is present in the domain config
node as shown below, implement system suspend with a simple 5 second
delay followed by a WFI. This allows testing system suspend when the
low-level firmware doesn't support it.

  / {
    chosen {
      opensbi-domains {
          compatible = "opensbi,domain,config";
          system-suspend-test;
      };

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Andrew Jones
2023-02-27 11:31:06 +01:00
committed by Anup Patel
parent 37558dccbe
commit 5ccebf0a7e
4 changed files with 55 additions and 1 deletions
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31
lib/sbi/sbi_system.c
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@@ -17,6 +17,7 @@
#include <sbi/sbi_system.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_init.h>
#include <sbi/sbi_timer.h>
static SBI_LIST_HEAD(reset_devices_list);
@@ -108,6 +109,36 @@ void sbi_system_suspend_set_device(struct sbi_system_suspend_device *dev)
suspend_dev = dev;
}
static int sbi_system_suspend_test_check(u32 sleep_type)
{
return sleep_type == SBI_SUSP_SLEEP_TYPE_SUSPEND;
}
static int sbi_system_suspend_test_suspend(u32 sleep_type,
unsigned long mmode_resume_addr)
{
if (sleep_type != SBI_SUSP_SLEEP_TYPE_SUSPEND)
return SBI_EINVAL;
sbi_timer_mdelay(5000);
/* Wait for interrupt */
wfi();
return SBI_OK;
}
static struct sbi_system_suspend_device sbi_system_suspend_test = {
.name = "system-suspend-test",
.system_suspend_check = sbi_system_suspend_test_check,
.system_suspend = sbi_system_suspend_test_suspend,
};
void sbi_system_suspend_test_enable(void)
{
sbi_system_suspend_set_device(&sbi_system_suspend_test);
}
bool sbi_system_suspend_supported(u32 sleep_type)
{
return suspend_dev && suspend_dev->system_suspend_check &&