soc/amd/common/smi_util: add PSP SMI helper functions

The PSP can send SMIs to the x86 side of the system. Add helper
functions to configure and to reset the PSP SMI generation. Since
Stoneyridge also selects SOC_AMD_COMMON_BLOCK_SMI, add the SMITRIG0_PSP
define and rename SMITYPE_FCH_FAKE0 to SMITYPE_PSP in its SoC-specific
smi.h to bring it in line with the newer SoCs.

This patch is split out from CB:65523.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Signed-off-by: Ritul Guru <ritul.bits@gmail.com>
Change-Id: I525a447c9a75fdb95b9750e85a02896056315edf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83702
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 26 insertions, 0 deletions

diff --git a/src/soc/amd/common/block/include/amdblocks/smi.h b/src/soc/amd/common/block/include/amdblocks/smi.h
index b870f16cdb..6995bef0f3 100644
--- a/src/soc/amd/common/block/include/amdblocks/smi.h
+++ b/src/soc/amd/common/block/include/amdblocks/smi.h
@@ -48,5 +48,7 @@ void disable_gevent_smi(uint8_t gevent);
 void gpe_configure_sci(const struct sci_source *scis, size_t num_gpes);
 void clear_all_smi_status(void);
 void clear_smi_sci_status(void);
+void reset_psp_smi(void);
+void configure_psp_smi(void);
 
 #endif /* AMD_BLOCK_SMI_H */
diff --git a/src/soc/amd/common/block/smi/smi_util.c b/src/soc/amd/common/block/smi/smi_util.c
index ac2f4b450c..8ec900f762 100644
--- a/src/soc/amd/common/block/smi/smi_util.c
+++ b/src/soc/amd/common/block/smi/smi_util.c
@@ -154,3 +154,27 @@ void clear_smi_sci_status(void)
 {
 	smi_write32(SMI_SCI_STATUS, smi_read32(SMI_SCI_STATUS));
 }
+
+static void clear_psp_smi(void)
+{
+	uint32_t reg32;
+	/* SMITYPE_PSP is 33, so it's bit 33 % 32 in the second 32 bit SMI status register */
+	reg32 = smi_read32(SMI_REG_SMISTS1);
+	reg32 |= 1 << (SMITYPE_PSP % 32);
+	smi_write32(SMI_REG_SMISTS1, reg32);
+}
+
+void reset_psp_smi(void)
+{
+	uint32_t reg32;
+	reg32 = smi_read32(SMI_REG_SMITRIG0);
+	reg32 &= ~SMITRIG0_PSP;
+	smi_write32(SMI_REG_SMITRIG0, reg32);
+}
+
+void configure_psp_smi(void)
+{
+	clear_psp_smi();
+	reset_psp_smi();
+	configure_smi(SMITYPE_PSP, SMI_MODE_SMI);
+}