drivers/wifi: Support Bluetooth Bands Selection Mode

This feature provides ability to provide Bluetooth Bands Selection
Mode. The bluetooth bands selection mode is defined as follow:

  |  Bit | Band GHz | Value | Description          | Default |
  |------+----------+-------+----------------------+---------|
  |    0 | 2.4GHz   |     0 | Controlled by NIC    |       0 |
  |      |          |     1 | Force disable 2.4GHz |         |
  |    1 | 5.2GHz   |     0 | Controlled by NIC    |       0 |
  |      |          |     1 | Force disable 5.2GHz |         |
  |    2 | 5.8GHz   |     0 | Controlled by NIC    |       0 |
  |      |          |     1 | Force disable 5.8GHz |         |
  |    3 | 6.2GHz   |     0 | Controlled by NIC    |       0 |
  |      |          |     1 | Force disable 6.2GHz |         |
  | 31:4 | Reserved |       | NA                   |       0 |

The implementation follows document 559910 Intel Connectivity
Platforms BIOS Guideline revision 9.2 specification.

BUG=b:346600091
TEST=BBSM method is added to the bluetooth companion device and
     return the data supplied by the SAR binary blob

Change-Id: Iebe95815c944d045f4cf686abcd1874a8a45e230
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84944
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

3 files changed, 53 insertions, 1 deletions

diff --git a/src/drivers/wifi/generic/acpi.c b/src/drivers/wifi/generic/acpi.c
index 8bfce816fb..a3fd3ca4c0 100644
--- a/src/drivers/wifi/generic/acpi.c
+++ b/src/drivers/wifi/generic/acpi.c
@@ -771,6 +771,41 @@ static void sar_emit_bdcm(const struct bdcm_profile *bdcm)
 	acpigen_write_package_end();
 }
 
+static void sar_emit_bbsm(const struct bbsm_profile *bbsm)
+{
+	if (bbsm == NULL)
+		return;
+
+	/*
+	 * Name ("BBSM", Package () {
+	 *   Revision,
+	 *   Package () {
+	 *     Domain Type,			// 0x12:Bluetooth
+	 *     Bluetooth Bands Selection
+	 *   }
+	 * })
+	 */
+	if (bbsm->revision != BBSM_REVISION) {
+		printk(BIOS_ERR, "Unsupported BBSM table revision: %d\n",
+		       bbsm->revision);
+		return;
+	}
+
+	acpigen_write_name("BBSM");
+	acpigen_write_package(2);
+	acpigen_write_dword(bbsm->revision);
+
+	/*
+	 * Emit 'Domain Type' + 'Bluetooth Bands Selection'
+	 */
+	acpigen_write_package(2);
+	acpigen_write_dword(DOMAIN_TYPE_BLUETOOTH);
+	acpigen_write_dword(bbsm->bands_selection);
+
+	acpigen_write_package_end();
+	acpigen_write_package_end();
+}
+
 static void emit_wifi_sar_acpi_structures(const struct device *dev,
 					  union wifi_sar_limits *sar_limits)
 {
@@ -906,6 +941,7 @@ static void wifi_ssdt_write_properties(const struct device *dev, const char *sco
 			sar_emit_bpag(sar_limits.bpag);
 			sar_emit_bbfb(sar_limits.bbfb);
 			sar_emit_bdcm(sar_limits.bdcm);
+			sar_emit_bbsm(sar_limits.bbsm);
 			acpigen_write_scope_end();
 		} else {
 			printk(BIOS_ERR, "Failed to get %s Bluetooth companion ACPI path\n",
diff --git a/src/include/sar.h b/src/include/sar.h
index d09ee0dd03..71daa238b4 100644
--- a/src/include/sar.h
+++ b/src/include/sar.h
@@ -9,13 +9,14 @@
 #define MAX_DENYLIST_ENTRY	16
 #define MAX_DSAR_SET_COUNT	3
 #define MAX_GEO_OFFSET_REVISION	3
-#define MAX_PROFILE_COUNT	10
+#define MAX_PROFILE_COUNT	11
 #define MAX_SAR_REVISION	2
 #define BSAR_REVISION		1
 #define WBEM_REVISION		0
 #define BPAG_REVISION		2
 #define BBFB_REVISION		1
 #define BDCM_REVISION		1
+#define BBSM_REVISION		1
 #define REVISION_SIZE		1
 #define SAR_REV0_CHAINS_COUNT	2
 #define SAR_REV0_SUBBANDS_COUNT	5
@@ -99,6 +100,11 @@ struct bdcm_profile {
 	uint32_t dual_chain_mode;
 } __packed;
 
+struct bbsm_profile {
+	uint8_t revision;
+	uint32_t bands_selection;
+} __packed;
+
 struct sar_header {
 	char marker[SAR_STR_PREFIX_SIZE];
 	uint8_t version;
@@ -118,6 +124,7 @@ union wifi_sar_limits {
 		struct bpag_profile *bpag;
 		struct bbfb_profile *bbfb;
 		struct bdcm_profile *bdcm;
+		struct bbsm_profile *bbsm;
 	};
 	void *profile[MAX_PROFILE_COUNT];
 };
diff --git a/src/vendorcode/google/chromeos/sar.c b/src/vendorcode/google/chromeos/sar.c
index bf2900b019..f6f11181d6 100644
--- a/src/vendorcode/google/chromeos/sar.c
+++ b/src/vendorcode/google/chromeos/sar.c
@@ -134,6 +134,14 @@ static size_t bdcm_table_size(const struct bdcm_profile *bdcm)
 	return sizeof(struct bdcm_profile);
 }
 
+static size_t bbsm_table_size(const struct bbsm_profile *bbsm)
+{
+	if (bbsm == NULL)
+		return 0;
+
+	return sizeof(struct bbsm_profile);
+}
+
 static bool valid_legacy_length(size_t bin_len)
 {
 	if (bin_len == LEGACY_SAR_WGDS_BIN_SIZE)
@@ -190,6 +198,7 @@ static int fill_wifi_sar_limits(union wifi_sar_limits *sar_limits, const uint8_t
 	expected_sar_bin_size += bpag_table_size(sar_limits->bpag);
 	expected_sar_bin_size += bbfb_table_size(sar_limits->bbfb);
 	expected_sar_bin_size += bdcm_table_size(sar_limits->bdcm);
+	expected_sar_bin_size += bbsm_table_size(sar_limits->bbsm);
 
 	if (sar_bin_size != expected_sar_bin_size) {
 		printk(BIOS_ERR, "Invalid SAR size, expected: %zu, obtained: %zu\n",