[S] Change in coreboot[main]: soc/amd/common: Add function to check the if it is in A/B recovery

[Bao Zheng (Code Review)]

Attention is currently required from: Felix Held, Fred Reitberger, Jason Glenesk, Matt DeVillier, Zheng Bao.

Hello Zheng Bao,

I'd like you to do a code review.
Please visit

https://review.coreboot.org/c/coreboot/+/84576?usp=email

to review the following change.

Change subject: soc/amd/common: Add function to check the if it is in A/B recovery
......................................................................

soc/amd/common: Add function to check the if it is in A/B recovery

Change-Id: Iadd0f91221e92eab5e563fa19d6e4ab199871b11
Signed-off-by: Zheng Bao 
---
M src/soc/amd/common/block/include/amdblocks/psp.h
M src/soc/amd/common/block/psp/psp_gen2.c
2 files changed, 10 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/76/84576/1

diff --git a/src/soc/amd/common/block/include/amdblocks/psp.h b/src/soc/amd/common/block/include/amdblocks/psp.h
index 1ab3385..83afdbe 100644
--- a/src/soc/amd/common/block/include/amdblocks/psp.h
+++ b/src/soc/amd/common/block/include/amdblocks/psp.h
@@ -84,4 +84,6 @@
 /* Sets the GPIO used for the TPM IRQ */
 void psp_set_tpm_irq_gpio(unsigned int gpio);

+uint8_t check_abrecovery(void);
+
 #endif /* AMD_BLOCK_PSP_H */
diff --git a/src/soc/amd/common/block/psp/psp_gen2.c b/src/soc/amd/common/block/psp/psp_gen2.c
index 2113b57..0ac069a 100644
--- a/src/soc/amd/common/block/psp/psp_gen2.c
+++ b/src/soc/amd/common/block/psp/psp_gen2.c
@@ -211,3 +211,11 @@
    *msg_38_value = read32p(psp_mmio | CORE_2_PSP_MSG_38_OFFSET);
    return CB_SUCCESS;
 }
+
+uint8_t check_abrecovery(void)
+{
+	union pspv2_mbox_command tmp;
+
+	tmp.val = smn_read32(SMN_PSP_PUBLIC_BASE + PSP_MAILBOX_COMMAND_OFFSET);
+	return !!tmp.fields.recovery;
+}