From a3146205c382ffdd440dc9c7ea2cac9b0f577aef Mon Sep 17 00:00:00 2001
From: Subrata Banik <subratabanik@google.com>
Date: Fri, 29 Apr 2022 14:19:32 +0530
Subject: [PATCH] soc/intel/cmn/blk/pmc: API to inform PMC about PCI
 enumeration done
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This patch sends an IPC to PMC to inform about PCI enumeration.

BUG=b:211954778
TEST=Able to build and boot google/redrix to OS.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I77d428f9501feaccab8bb431090d10ce8d3af9b2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63953
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
---
 .../common/block/include/intelblocks/pmclib.h    |  3 +++
 src/soc/intel/common/block/pmc/pmclib.c          | 16 ++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/soc/intel/common/block/include/intelblocks/pmclib.h b/src/soc/intel/common/block/include/intelblocks/pmclib.h
index fc65a089d3..62f27a9d5a 100644
--- a/src/soc/intel/common/block/include/intelblocks/pmclib.h
+++ b/src/soc/intel/common/block/include/intelblocks/pmclib.h
@@ -28,6 +28,9 @@ enum pch_pmc_xtal {
  */
 enum pch_pmc_xtal pmc_get_xtal_freq(void);
 
+/* pmc_send_pci_enum_done() - send PMC IPC to inform PCI enumeration is done. */
+void pmc_send_pci_enum_done(void);
+
 /* Forward declare the power state struct here */
 struct chipset_power_state;
 
diff --git a/src/soc/intel/common/block/pmc/pmclib.c b/src/soc/intel/common/block/pmc/pmclib.c
index a733920139..0f1da72577 100644
--- a/src/soc/intel/common/block/pmc/pmclib.c
+++ b/src/soc/intel/common/block/pmc/pmclib.c
@@ -10,6 +10,7 @@
 #include <cpu/x86/smm.h>
 #include <console/console.h>
 #include <halt.h>
+#include <intelblocks/pmc_ipc.h>
 #include <intelblocks/pmclib.h>
 #include <intelblocks/gpio.h>
 #include <intelblocks/tco.h>
@@ -21,6 +22,9 @@
 #include <string.h>
 #include <timer.h>
 
+#define PMC_IPC_BIOS_RST_COMPLETE		0xd0
+#define PMC_IPC_BIOS_RST_SUBID_PCI_ENUM_DONE	0
+
 static struct chipset_power_state power_state;
 
 /* List of Minimum Assertion durations in microseconds */
@@ -785,3 +789,15 @@ enum pch_pmc_xtal pmc_get_xtal_freq(void)
 		return XTAL_UNKNOWN_FREQ;
 	}
 }
+
+void pmc_send_pci_enum_done(void)
+{
+	struct pmc_ipc_buffer req = { 0 };
+	struct pmc_ipc_buffer rsp;
+	uint32_t cmd;
+
+	cmd = pmc_make_ipc_cmd(PMC_IPC_BIOS_RST_COMPLETE,
+			 PMC_IPC_BIOS_RST_SUBID_PCI_ENUM_DONE, 0);
+	if (pmc_send_ipc_cmd(cmd, &req, &rsp) != CB_SUCCESS)
+		printk(BIOS_ERR, "PMC: Failed sending PCI Enumeration Done Command\n");
+}