Change in coreboot[master]: soc/intel/tigerlake: Define soc_get_pcie_rp_type

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: Patrick Rudolph.
Tim Wawrzynczak has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/59853 )

Change subject: soc/intel/tigerlake: Define soc_get_pcie_rp_type
......................................................................

soc/intel/tigerlake: Define soc_get_pcie_rp_type

In order to distinguish PCH from CPU PCIe RPs, define the
soc_get_pcie_rp_type function for tigerlake.

BUG=b:197983574

Signed-off-by: Tim Wawrzynczak 
Change-Id: Ic3f7d3f2fc12ae2b53604cd8f8b694a7674c3620
---
M src/soc/intel/common/block/include/intelblocks/pcie_rp.h
M src/soc/intel/tigerlake/Makefile.inc
A src/soc/intel/tigerlake/pcie_rp.c
3 files changed, 58 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/53/59853/1

diff --git a/src/soc/intel/common/block/include/intelblocks/pcie_rp.h b/src/soc/intel/common/block/include/intelblocks/pcie_rp.h
index f74706e..52eaecf 100644
--- a/src/soc/intel/common/block/include/intelblocks/pcie_rp.h
+++ b/src/soc/intel/common/block/include/intelblocks/pcie_rp.h
@@ -117,4 +117,9 @@
    PCIE_RP_PCH,
 };

+/*
+ * For PCIe RTD3 support, each SoC that uses it must implement this function.
+ */
+enum pcie_rp_type soc_get_pcie_rp_type(const struct device *dev);
+
 #endif /* SOC_INTEL_COMMON_BLOCK_PCIE_RP_H */
diff --git a/src/soc/intel/tigerlake/Makefile.inc b/src/soc/intel/tigerlake/Makefile.inc
index 6da5e00..25a1d65 100644
--- a/src/soc/intel/tigerlake/Makefile.inc
+++ b/src/soc/intel/tigerlake/Makefile.inc
@@ -34,6 +34,7 @@
 ramstage-y += lpm.c
 ramstage-y += me.c
 ramstage-y += p2sb.c
+ramstage-y += pcie_rp.c
 ramstage-y += pmc.c
 ramstage-y += reset.c
 ramstage-y += soundwire.c
diff --git a/src/soc/intel/tigerlake/pcie_rp.c b/src/soc/intel/tigerlake/pcie_rp.c
new file mode 100644
index 0000000..f8d4109
--- /dev/null
+++ b/src/soc/intel/tigerlake/pcie_rp.c
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/device.h>
+#include <intelblocks/pcie_rp.h>
+#include <soc/pci_devs.h>
+#include <soc/pcie.h>
+
+static const struct pcie_rp_group pch_lp_rp_groups[] = {
+	{ .slot = PCH_DEV_SLOT_PCIE,	.count = 8 },
+	{ .slot = PCH_DEV_SLOT_PCIE_1,	.count = 4 },
+	{ 0 }
+};
+
+static const struct pcie_rp_group cpu_rp_groups[] = {
+	{ .slot = SA_DEV_SLOT_CPU_6, .start = 0, .count = 1 },
+	{ .slot = SA_DEV_SLOT_CPU_1, .start = 0, .count = 1 },
+	{ .slot = SA_DEV_SLOT_CPU_6, .start = 2, .count = 1 },
+	{ 0 }
+};
+
+static bool is_part_of_group(const struct device *dev,
+			     const struct pcie_rp_group *groups)
+{
+	if (dev->path.type != DEVICE_PATH_PCI)
+		return false;
+
+	const unsigned int slot_to_find = PCI_SLOT(dev->path.pci.devfn);
+	const unsigned int fn_to_find = PCI_FUNC(dev->path.pci.devfn);
+	const struct pcie_rp_group *group;
+	unsigned int i;
+	unsigned int fn;
+
+	for (group = groups; group->count; ++group) {
+		for (i = 0, fn = rp_start_fn(group); i < group->count; i++, fn++) {
+			if (slot_to_find == group->slot && fn_to_find == fn)
+				return true;
+		}
+	}
+
+	return false;
+}
+
+enum pcie_rp_type soc_get_pcie_rp_type(const struct device *dev)
+{
+	if (is_part_of_group(dev, pch_lp_rp_groups))
+		return PCIE_RP_PCH;
+
+	if (is_part_of_group(dev, cpu_rp_groups))
+		return PCIE_RP_CPU;
+
+	return PCIE_RP_UNKNOWN;
+}