drivers/wifi: Support 320Mhz Bandwidth Enablement per MCC

Add support for the configuration of 320MHz Bandwidth per MCC based on
countries. The implementation follows document #559910 Intel
Connectivity Platforms BIOS Guidelines revision 8.3.

BUG=b:333804562
BRANCH=firmware-rex-15709.B
TEST=WBEM method is added to the CNVW device and return the data
     supplied by the SAR binary blob

Change-Id: Ie76794825f1a0104d199c078aa4ffc714aa95b17
Signed-off-by: Poornima Tom <poornima.tom@intel.com>
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81790
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Eric Lai <ericllai@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/wifi/generic/acpi.c

@@ -539,6 +539,43 @@ static void sar_emit_brds(const struct bsar_profile *bsar)
 	acpigen_write_package_end();
 }
 
+static void sar_emit_wbem(const struct wbem_profile *wbem)
+{
+	if (wbem == NULL)
+		return;
+
+	/*
+	 * Name ("WBEM", Package() {
+	 * {
+	 *   Revision,
+	 *   Package()
+	 *   {
+	 *     DomainType,				// 0x7:WiFi
+	 *     bandwidth_320mhz_country_enablement	// 0 Disabled
+	 *						// 1 Japan Enabled
+	 *						// 2 South Korea Enabled
+	 *						// 3 Japan + South Korea Enabled
+	 *   }
+	 } })
+	 */
+	if (wbem->revision != WBEM_REVISION) {
+		printk(BIOS_ERR, "Unsupported WBEM table revision: %d\n",
+		       wbem->revision);
+		return;
+	}
+
+	acpigen_write_name("WBEM");
+	acpigen_write_package(2);
+	acpigen_write_dword(wbem->revision);
+
+	acpigen_write_package(2);
+	acpigen_write_dword(DOMAIN_TYPE_WIFI);
+	acpigen_write_dword(wbem->bandwidth_320mhz_country_enablement);
+
+	acpigen_write_package_end();
+	acpigen_write_package_end();
+}
+
 static void emit_sar_acpi_structures(const struct device *dev, struct dsm_profile *dsm,
 				     struct bsar_profile *bsar, bool *bsar_loaded)
 {
@@ -562,6 +599,7 @@ static void emit_sar_acpi_structures(const struct device *dev, struct dsm_profil
 	sar_emit_wgds(sar_limits.wgds);
 	sar_emit_ppag(sar_limits.ppag);
 	sar_emit_wtas(sar_limits.wtas);
+	sar_emit_wbem(sar_limits.wbem);
 
 	/* copy the dsm data to be later used for creating _DSM function */
 	if (sar_limits.dsm != NULL)

src/include/sar.h

@@ -9,9 +9,10 @@
 #define MAX_DENYLIST_ENTRY	16
 #define MAX_DSAR_SET_COUNT	3
 #define MAX_GEO_OFFSET_REVISION	3
-#define MAX_PROFILE_COUNT	6
+#define MAX_PROFILE_COUNT	7
 #define MAX_SAR_REVISION	2
 #define BSAR_REVISION		1
+#define WBEM_REVISION		0
 #define REVISION_SIZE		1
 #define SAR_REV0_CHAINS_COUNT	2
 #define SAR_REV0_SUBBANDS_COUNT	5
@@ -73,6 +74,11 @@ struct bsar_profile {
 	uint8_t le_lr_modulation;
 } __packed;
 
+struct wbem_profile {
+	uint8_t revision;
+	uint32_t bandwidth_320mhz_country_enablement;
+} __packed;
+
 struct sar_header {
 	char marker[SAR_STR_PREFIX_SIZE];
 	uint8_t version;
@@ -88,6 +94,7 @@ union wifi_sar_limits {
 		struct avg_profile *wtas;
 		struct dsm_profile *dsm;
 		struct bsar_profile *bsar;
+		struct wbem_profile *wbem;
 	};
 	void *profile[MAX_PROFILE_COUNT];
 };

src/vendorcode/google/chromeos/sar.c

@@ -102,6 +102,14 @@ static int bsar_table_size(const struct bsar_profile *bsar)
 	return sizeof(struct bsar_profile);
 }
 
+static int wbem_table_size(const struct wbem_profile *wbem)
+{
+	if (wbem == NULL)
+		return 0;
+
+	return sizeof(struct wbem_profile);
+}
+
 static bool valid_legacy_length(size_t bin_len)
 {
 	if (bin_len == LEGACY_SAR_WGDS_BIN_SIZE)
@@ -154,6 +162,7 @@ static int fill_wifi_sar_limits(union wifi_sar_limits *sar_limits, const uint8_t
 	expected_sar_bin_size += sar_avg_table_size(sar_limits->wtas);
 	expected_sar_bin_size += dsm_table_size(sar_limits->dsm);
 	expected_sar_bin_size += bsar_table_size(sar_limits->bsar);
+	expected_sar_bin_size += wbem_table_size(sar_limits->wbem);
 
 	if (sar_bin_size != expected_sar_bin_size) {
 		printk(BIOS_ERR, "Invalid SAR size, expected: %zu, obtained: %zu\n",
@@ -220,6 +229,7 @@ static int fill_wifi_sar_limits_legacy(union wifi_sar_limits *sar_limits,
  * [WTAS_REVISION, WTAS_DATA]
  * [DSM_RETURN_VALUES]
  * [BSAR_REVISION,IPML,LB,BR,EDR2,EDR3,LE,LE2,LE_LR]
+ * [WBEM_REVISION, WBEM_DATA]
  *
  * The configuration data will always have the revision added in the file for each of the
  * block, based on the revision number and validity, size of the specific block will be
@@ -259,6 +269,8 @@ static int fill_wifi_sar_limits_legacy(union wifi_sar_limits *sar_limits,
  *      [Enable/disable the TAS feature]
  *      [Number of blocked countries that are not approved by the OEM to support this feature]
  *      [deny_list_entry_<1-16>: ISO country code to block]
+ * [WBEM_DATA] =
+ *      [Enable or disable 320MHZ Bandwidth for Japan, SouthKorea]
  */
 int get_wifi_sar_limits(union wifi_sar_limits *sar_limits)
 {