intel/wifi: Create ACPI objects for wifi SAR configuration

To support intel wifi SAR configuration, it is required coreboot
to publish two ACPI objects (WRDS and EWRD) to supply SAR limit
data sets. VPD entry "wifi_sar" is required to supply the raw SAR
limit data.

BUG=chrome-os-partner:60821
TEST=Enable USE_SAR, boot reef to OS, create the VPD entry, reboot,
check the SSDT dump and verify WRDS and EWRD structures.

Change-Id: I6be345735292d0ca46f2f7e7ea61924990d338a8
Signed-off-by: Robbie Zhang <robbie.zhang@intel.com>
Reviewed-on: https://review.coreboot.org/17959
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/src/drivers/intel/wifi/wifi.c b/src/drivers/intel/wifi/wifi.c
index 789d0d5431..06bc54c788 100644
--- a/src/drivers/intel/wifi/wifi.c
+++ b/src/drivers/intel/wifi/wifi.c
@@ -20,6 +20,7 @@
 #include <device/device.h>
 #include <device/pci.h>
 #include <device/pci_ids.h>
+#include <sar.h>
 #include <smbios.h>
 #include <string.h>
 #include <wrdd.h>
@@ -59,6 +60,72 @@ static int smbios_write_wifi(struct device *dev, int *handle,
 #endif
 
 #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+static void emit_sar_acpi_structures(void)
+{
+	int i, j, package_size;
+	struct wifi_sar_limits sar_limits;
+
+	/* Retrieve the sar limits data */
+	if (get_wifi_sar_limits(&sar_limits) < 0) {
+		printk(BIOS_ERR, "Error: failed from getting SAR limits!\n");
+		return;
+	}
+
+	/*
+	 * Name ("WRDS", Package () {
+	 *   Revision,
+	 *   Package () {
+	 *     Domain Type,	// 0x7:WiFi
+	 *     WiFi SAR BIOS,	// BIOS SAR Enable/disable
+	 *     SAR Table Set	// Set#1 of SAR Table (10 bytes)
+	 *   }
+	 * })
+	 */
+	acpigen_write_name("WRDS");
+	acpigen_write_package(2);
+	acpigen_write_dword(WRDS_REVISION);
+	/* Emit 'Domain Type' + 'WiFi SAR BIOS' + 10 bytes for Set#1 */
+	package_size = 1 + 1 + BYTES_PER_SAR_LIMIT;
+	acpigen_write_package(package_size);
+	acpigen_write_dword(WRDS_DOMAIN_TYPE_WIFI);
+	acpigen_write_dword(CONFIG_SAR_ENABLE);
+	for (i = 0; i < BYTES_PER_SAR_LIMIT; i++)
+		acpigen_write_byte(sar_limits.sar_limit[0][i]);
+	acpigen_pop_len();
+	acpigen_pop_len();
+
+	/*
+	 * Name ("EWRD", Package () {
+	 *   Revision,
+	 *   Package () {
+	 *     Domain Type,		// 0x7:WiFi
+	 *     Dynamic SAR Enable,	// Dynamic SAR Enable/disable
+	 *     Extended SAR sets,	// Number of optional SAR table sets
+	 *     SAR Table Set,		// Set#2 of SAR Table (10 bytes)
+	 *     SAR Table Set,		// Set#3 of SAR Table (10 bytes)
+	 *     SAR Table Set		// Set#4 of SAR Table (10 bytes)
+	 *   }
+	 * })
+	 */
+	acpigen_write_name("EWRD");
+	acpigen_write_package(2);
+	acpigen_write_dword(EWRD_REVISION);
+	/*
+	 * Emit 'Domain Type' + "Dynamic SAR Enable' + 'Extended SAR sets'
+	 * + number of bytes for Set#2 & 3 & 4
+	 */
+	package_size = 1 + 1 + 1 + (NUM_SAR_LIMITS - 1) * BYTES_PER_SAR_LIMIT;
+	acpigen_write_package(package_size);
+	acpigen_write_dword(EWRD_DOMAIN_TYPE_WIFI);
+	acpigen_write_dword(CONFIG_DSAR_ENABLE);
+	acpigen_write_dword(CONFIG_DSAR_SET_NUM);
+	for (i = 1; i < NUM_SAR_LIMITS; i++)
+		for (j = 0; j < BYTES_PER_SAR_LIMIT; j++)
+			acpigen_write_byte(sar_limits.sar_limit[i][j]);
+	acpigen_pop_len();
+	acpigen_pop_len();
+}
+
 static void intel_wifi_fill_ssdt(struct device *dev)
 {
 	struct drivers_intel_wifi_config *config = dev->chip_info;
@@ -105,6 +172,10 @@ static void intel_wifi_fill_ssdt(struct device *dev)
 		acpigen_pop_len();
 	}
 
+	/* Fill Wifi sar related ACPI structures */
+	if (IS_ENABLED(CONFIG_USE_SAR))
+		emit_sar_acpi_structures();
+
 	acpigen_pop_len(); /* Device */
 	acpigen_pop_len(); /* Scope */