vc/google: Decouple DSM_CALIB from CHROMEOS

DSM (Dynamic Speaker Management) uses calibration parameters stored in
a VPD (Vital Product Data) FMAP region to configure the audio output
via an ACPI _DSD table. This has no dependency on a ChromeOS, and can
be used by Linux/Windows drivers if appropriately configured.

Remove the dependency of DSM_CALIB (and the calibration file) on
CHROMEOS and replace it with VPD, so that non-CHROMEOS builds
can utilize this feature as well. Move files from underneath
vc/google/chromeos to underscore the point.

TEST=build/boot google/nightfury, dump ACPI, verify DSM calibraton
parameters present in _DSD table.

Change-Id: I643b3581bcc662befc9e30736dae806f94b055af
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74812
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: CoolStar <coolstarorganization@gmail.com>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

src/vendorcode/google/Kconfig

@@ -9,3 +9,22 @@ config GOOGLE_SMBIOS_MAINBOARD_VERSION
 	help
 	  Provide a common implementation for mainboard version,
 	  which returns a formatted 'rev%d' board_id() string.
+
+config GOOGLE_DSM_CALIB
+	bool
+	default n
+	depends on VPD
+	help
+	  On some boards, there are calibrated parameters for Dynamic Speaker Management(DSM)
+	  stored in VPD. Enable this config to read and parse these VPD values and write them
+	  to ACPI DSD table in device driver. These parameters will be applied by kernel driver
+	  through device property at boot.
+
+config GOOGLE_DSM_PARAM_FILE_NAME
+	bool
+	default n
+	depends on GOOGLE_DSM_CALIB
+	help
+	  On some boards, there are different dsm parameter files for Dynamic Speaker
+	  Management (DSM). Enable this config to assign dsm parameters file name in ACPI
+	  SSDT table. Kernel driver uses this to load the DSM parameter file.

src/vendorcode/google/Makefile.inc

@@ -2,4 +2,5 @@
 
 subdirs-$(CONFIG_CHROMEOS) += chromeos
 
+ramstage-$(CONFIG_GOOGLE_DSM_CALIB) += dsm_calib.c
 ramstage-$(CONFIG_GOOGLE_SMBIOS_MAINBOARD_VERSION) += smbios.c

src/vendorcode/google/chromeos/Kconfig

@@ -57,23 +57,6 @@ config CHROMEOS_USE_EC_WATCHDOG_FLAG
 	help
 	  Use the AP watchdog flag stored in EC.
 
-config CHROMEOS_DSM_CALIB
-	bool
-	default n
-	help
-	  On some boards, there are calibrated parameters for Dynamic Speaker Management(DSM)
-	  stored in VPD. Enable this config to read and parse these VPD values and write them
-	  to ACPI DSD table in device driver. These parameters will be applied by kernel driver
-	  through device property at boot.
-
-config CHROMEOS_DSM_PARAM_FILE_NAME
-	bool
-	default n
-	help
-	  On some boards, there are different dsm parameter files for Dynamic Speaker
-	  Management (DSM). Enable this config to assign dsm parameters file name in ACPI
-	  SSDT table. Kernel driver uses this to load the DSM parameter file.
-
 config CHROMEOS_CSE_BOARD_RESET_OVERRIDE
 	bool
 	default n

src/vendorcode/google/chromeos/Makefile.inc

@@ -8,7 +8,6 @@ ramstage-y += vpd_mac.c vpd_serialno.c vpd_calibration.c
 ramstage-$(CONFIG_CHROMEOS_DISABLE_PLATFORM_HIERARCHY_ON_RESUME) += tpm2.c
 ramstage-$(CONFIG_HAVE_REGULATORY_DOMAIN) += wrdd.c
 ramstage-$(CONFIG_USE_SAR) += sar.c
-ramstage-$(CONFIG_CHROMEOS_DSM_CALIB) += dsm_calib.c
 ramstage-$(CONFIG_TPM_GOOGLE) += cr50_enable_update.c
 
 romstage-$(CONFIG_CHROMEOS_CSE_BOARD_RESET_OVERRIDE) += cse_board_reset.c

src/vendorcode/google/chromeos/chromeos.h

@@ -27,16 +27,6 @@ void cbmem_add_vpd_calibration_data(void);
 void chromeos_set_me_hash(u32*, int);
 void chromeos_set_ramoops(void *ram_oops, size_t size);
 
-/**
- * get_dsm_calibration_from_key - Gets value related to DSM calibration from VPD
- * @key: The key in RO_VPD. The valid prefix is "dsm_calib_". The valid keys are
- *   documented in https://chromeos.google.com/partner/dlm/docs/factory/vpd.html.
- * @value: Output value. The value read from VPD parsed into uint64_t integer.
- *
- * Returns CB_SUCCESS on success or CB_ERR on failure.
- */
-enum cb_err get_dsm_calibration_from_key(const char *key, uint64_t *value);
-
 /*
  * Declaration for mainboards to use to generate ACPI-specific ChromeOS needs.
  */

src/vendorcode/google/dsm_calib.c

@@ -5,7 +5,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <types.h>
-#include <vendorcode/google/chromeos/chromeos.h>
+#include "dsm_calib.h"
 
 #define DSM_BUF_LEN 128
 #define DSM_PREFIX "dsm_calib_"

src/vendorcode/google/dsm_calib.h

@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __DSM_CALIB_H__
+#define __DSM_CALIB_H__
+
+#include <stddef.h>
+#include <stdint.h>
+#include <types.h>
+
+/**
+ * get_dsm_calibration_from_key - Gets value related to DSM calibration from VPD
+ * @key: The key in RO_VPD. The valid prefix is "dsm_calib_". The valid keys are
+ *   documented in https://chromeos.google.com/partner/dlm/docs/factory/vpd.html.
+ * @value: Output value. The value read from VPD parsed into uint64_t integer.
+ *
+ * Returns CB_SUCCESS on success or CB_ERR on failure.
+ */
+enum cb_err get_dsm_calibration_from_key(const char *key, uint64_t *value);
+
+#endif /* __DSM_CALIB_H__ */