[S] Change in coreboot[master]: soc/intel/alderlake: Implement `soc_is_ish_partition_enabled` override

[Subrata Banik (Code Review)]

Attention is currently required from: Tarun Tuli.

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/74532 )

Change subject: soc/intel/alderlake: Implement `soc_is_ish_partition_enabled` override
......................................................................

soc/intel/alderlake: Implement `soc_is_ish_partition_enabled` override

This patch implements `soc_is_ish_partition_enabled()` override to
uniquely identify the SKU type between UFS and non-UFS to conclude
if ISH partition is enabled and need to retrieve the ISH version from
CSE FPT by sending HECI command.

TEST=Able to uniquely identify the UFS and non-UFS SKUs while booting
to google/rex.

Signed-off-by: Subrata Banik 
Change-Id: I7771aebb988f11d9d1b2824aa28e6f294fd67c25
---
M src/soc/intel/alderlake/chip.c
1 file changed, 32 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/32/74532/1

diff --git a/src/soc/intel/alderlake/chip.c b/src/soc/intel/alderlake/chip.c
index 7cdeb7c..2d27f0f 100644
--- a/src/soc/intel/alderlake/chip.c
+++ b/src/soc/intel/alderlake/chip.c
@@ -161,6 +161,20 @@
    return NULL;
 }
 #endif
+/*
+ * SoC override API to identify if ISH Firmware existed inside CSE FPT.
+ *
+ * SoC with UFS enabled would like to keep ISH enabled as well, hence
+ * identifying the UFS enabled device is enough to conclude that the ISH
+ * partition also is available.
+ */
+bool soc_is_ish_partition_enabled(void)
+{
+	if (is_devfn_enabled(PCH_DEVFN_UFS))
+		return true;
+
+	return false;
+}

/* SoC routine to fill GPIO PM mask and value for GPIO_MISCCFG register */
 static void soc_fill_gpio_pm_configuration(void)