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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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20
platform/generic/platform.c
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@@ -13,6 +13,7 @@
#include <sbi/sbi_hartmask.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_string.h>
#include <sbi/sbi_system.h>
#include <sbi_utils/fdt/fdt_domain.h>
#include <sbi_utils/fdt/fdt_fixup.h>
#include <sbi_utils/fdt/fdt_helper.h>
@@ -219,7 +220,24 @@ static int generic_extensions_init(struct sbi_hart_features *hfeatures)
static int generic_domains_init(void)
{
return fdt_domains_populate(fdt_get_address());
void *fdt = fdt_get_address();
int offset, ret;
ret = fdt_domains_populate(fdt);
if (ret < 0)
return ret;
offset = fdt_path_offset(fdt, "/chosen");
if (offset >= 0) {
offset = fdt_node_offset_by_compatible(fdt, offset,
"opensbi,domain,config");
if (offset >= 0 &&
fdt_get_property(fdt, offset, "system-suspend-test", NULL))
sbi_system_suspend_test_enable();
}
return 0;
}
static u64 generic_tlbr_flush_limit(void)