soc/intel/alderlake: Fix UFS OCP fabric timeout

The delayed return of certain fetch instruction from memory to
the UFS causes the OCP fabric to timeout on the transaction
and become non-responsive.
As recommended by the SoC and IP teams,program the
OCP fabric register to avoid the timeout in the OCP fabric.

This patch adds the following changes
1. Program the OCP fabric registers in the PS0 routine.
2. Move the ssdt contents of UFS to dsdt asl code to avoid
duplication of UFS device creation

BUG=b:240222922
TEST=Build and boot Nirwen UFS board, observe no system hang
during Chrome PLT test.

Signed-off-by: Meera Ravindranath <meera.ravindranath@intel.com>
Change-Id: I949a4538ea5c5c378a4e8ff7bb88546db1412df2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67770
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>

5 files changed, 95 insertions, 55 deletions

diff --git a/src/soc/intel/alderlake/acpi/southbridge.asl b/src/soc/intel/alderlake/acpi/southbridge.asl
index 3c37d5781b..2e419b18f5 100644
--- a/src/soc/intel/alderlake/acpi/southbridge.asl
+++ b/src/soc/intel/alderlake/acpi/southbridge.asl
@@ -31,6 +31,9 @@
 #include "scs.asl"
 #endif
 
+/* UFS */
+#include "ufs.asl"
+
 /* SMBus 0:1f.4 */
 #include <soc/intel/common/block/acpi/acpi/smbus.asl>
 
diff --git a/src/soc/intel/alderlake/acpi/ufs.asl b/src/soc/intel/alderlake/acpi/ufs.asl
new file mode 100644
index 0000000000..d6774f85cf
--- /dev/null
+++ b/src/soc/intel/alderlake/acpi/ufs.asl
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <soc/pcr_ids.h>
+
+#define R_SCS_CFG_PCS               0x84
+#define R_SCS_CFG_PG_CONFIG         0xA2
+
+#define PID_UFSX2                   0x50
+
+#define R_SCS_PCR_1C20              0x1C20
+#define R_SCS_PCR_4820              0x4820
+#define R_SCS_PCR_4020              0x4020
+#define R_SCS_PCR_5820              0x5820
+#define R_SCS_PCR_5C20              0x5C20
+#define R_SCS_PCR_1078              0x1078
+#define R_PMC_PWRM_LTR_IGN          0x1B0C
+
+External(PCRA, MethodObj)
+
+Scope (\_SB.PCI0)
+{
+	Device (UFS)
+	{
+		Name (_ADR, 0x0000000000120007) //  _ADR: Address
+		Name (_DDN, "UFS Controller")  // _DDN: DOS Device Name
+		Name (_DSD, Package (0x02)  // _DSD: Device-Specific Data
+		{
+			ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301") /* Device Properties for _DSD */,
+			Package (0x01)
+			{
+				Package (0x02)
+				{
+					"ref-clk-freq",
+					CONFIG_SOC_INTEL_UFS_CLK_FREQ_HZ
+				}
+			}
+		})
+
+		Method (OCPD, 0, Serialized)
+		{
+
+			/*
+			*  OCP Timer need to be disabled in SCS UFS IOSF Bridge to work around
+			*  the Silicon Issue due to which LTR mechanism doest work Registers
+			*  from the UFS OCP Fabric Register space that need to be programmed
+			*  for the timeout are
+			*  Upstream Initiator Port  -- offset 0x4020
+			*  Downstream Target Port  -- offset 0x4820
+			*  Downstream Target port at Controller -- offset 0x5c20
+			*  Upstream Initiator port at Controller -- offset 0x5820
+			*  Control over interconnect-wide functions -- offset 0x1078
+			*/
+				PCRA (PID_UFSX2, R_SCS_PCR_4020, 0x0)
+				PCRA (PID_UFSX2, R_SCS_PCR_4820, 0x0)
+				PCRA (PID_UFSX2, R_SCS_PCR_5C20, 0x0)
+				PCRA (PID_UFSX2, R_SCS_PCR_5820, 0x0)
+				PCRA (PID_UFSX2, R_SCS_PCR_1078, 0x0)
+		}
+
+		/* Memory Region to access to the UFS PCI Configuration Space */
+
+		OperationRegion(SCSR, PCI_Config, 0x00, 0x100)
+		Field (SCSR, ByteAcc, NoLock, Preserve)
+		{
+			Offset(R_SCS_CFG_PCS),	/*	0x84, PMCSR - Power Management Control and Status*/
+			PSTA,32,
+			Offset(R_SCS_CFG_PG_CONFIG),/* 0xA2, Device PG config */
+			, 2,
+			PGEN, 1	/* [BIT2] PGE - PG Enable */
+		}
+
+		Method (_PS0, 0, Serialized)
+		{
+			Store(0, PGEN) /* Disable PG */
+
+			And(PSTA, 0xFFFFFFFC, PSTA) /* Set BIT[1:0] = 00b - Power State D0 */
+
+			/* Disable OCP Timer in SCS UFS IOSF Bridge */
+			OCPD ()
+		}
+
+		Method (_PS3, 0, Serialized)
+		{
+
+			Store(1, PGEN)	/* Enable PG */
+		}
+		Method (_INI)
+		{
+			OCPD ()
+		}
+	}
+}
diff --git a/src/soc/intel/common/block/scs/Kconfig b/src/soc/intel/common/block/scs/Kconfig
index 6b5f49ea67..192425c4a0 100644
--- a/src/soc/intel/common/block/scs/Kconfig
+++ b/src/soc/intel/common/block/scs/Kconfig
@@ -19,10 +19,3 @@ config SOC_INTEL_COMMON_MMC_OVERRIDE
 	help
 	  Override the MMC settings after FSP-S.
 	  It should be used only when there is no FSP UPDs for certain setting.
-
-config SOC_INTEL_COMMON_UFS_SUPPORT
-	bool
-	default n
-	help
-	  Enable UFS support. Should be enabled when a particular SoC supports
-	  boot from UFS.
diff --git a/src/soc/intel/common/block/scs/Makefile.inc b/src/soc/intel/common/block/scs/Makefile.inc
index aa5f2b5d95..0b77f5fa21 100644
--- a/src/soc/intel/common/block/scs/Makefile.inc
+++ b/src/soc/intel/common/block/scs/Makefile.inc
@@ -2,5 +2,4 @@ ifneq ($(CONFIG_SOC_INTEL_ALDERLAKE_PCH_N),y)
 ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_SCS) += sd.c
 endif
 ramstage-$(CONFIG_SOC_INTEL_COMMON_BLOCK_SCS) += mmc.c
-ramstage-$(CONFIG_SOC_INTEL_COMMON_UFS_SUPPORT) += ufs.c
 romstage-$(CONFIG_SOC_INTEL_COMMON_EARLY_MMC_WAKE) += early_mmc.c
diff --git a/src/soc/intel/common/block/scs/ufs.c b/src/soc/intel/common/block/scs/ufs.c
deleted file mode 100644
index e70c87bfff..0000000000
--- a/src/soc/intel/common/block/scs/ufs.c
+++ /dev/null
@@ -1,47 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-#include <acpi/acpi_device.h>
-#include <acpi/acpigen.h>
-#include <acpi/acpigen_pci.h>
-#include <device/pci.h>
-#include <device/pci_ids.h>
-
-#if CONFIG(HAVE_ACPI_TABLES)
-static void ufs_fill_ssdt(const struct device *dev)
-{
-	struct acpi_dp *dsd;
-
-	const char *scope = acpi_device_scope(dev);
-
-	acpigen_write_scope(scope);
-	acpigen_write_device("UFS");
-	acpigen_write_ADR_pci_device(dev);
-	acpigen_write_name_string("_DDN", "UFS Controller");
-
-	dsd = acpi_dp_new_table("_DSD");
-	acpi_dp_add_integer(dsd, "ref-clk-freq", CONFIG_SOC_INTEL_UFS_CLK_FREQ_HZ);
-	acpi_dp_write(dsd);
-	acpigen_write_device_end();
-	acpigen_pop_len();
-}
-#endif
-
-static struct device_operations dev_ops = {
-	.read_resources		= pci_dev_read_resources,
-	.set_resources		= pci_dev_set_resources,
-	.enable_resources	= pci_dev_enable_resources,
-#if CONFIG(HAVE_ACPI_TABLES)
-	.acpi_fill_ssdt		= ufs_fill_ssdt,
-#endif
-	.ops_pci		= &pci_dev_ops_pci,
-};
-
-static const unsigned short pci_device_ids[] = {
-	PCI_DID_INTEL_ADP_UFS,
-	0
-};
-
-static const struct pci_driver pch_ufs __pci_driver = {
-	.ops		= &dev_ops,
-	.vendor		= PCI_VID_INTEL,
-	.devices	= pci_device_ids
-};