mb/google/zork/var/vilboz: Add WiFi SAR for Vilboz

The fw_config field SPI_SPEED is not used for zork devices.
To define SAR config, use the fw_config bit[23..26].
Then vilboz can loaded different WiFi SAR table for different SKUs.

BUG=b:176858126, b:176751675, b:176538384
BRANCH=zork
TEST=emerge-zork coreboot chromeos-bootimage, then verify that tables are
in CBFS and loaded by iwlwifi driver.

Signed-off-by: Frank Wu <frank_wu@compal.corp-partner.google.com>
Change-Id: I5ba98799e697010997b515ee88420d0ac14ca7ec
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49296
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/zork/variants/baseboard/helpers.c

@@ -40,9 +40,9 @@ enum {
 	/* SD controller type */
 	FW_CONFIG_MASK_SD_CTRLR = 0x7,
 	FW_CONFIG_SHIFT_SD_CTRLR = 20,
-	/* SPI speed value */
+	/* SAR presence */
-	FW_CONFIG_MASK_SPI_SPEED = 0xf,
+	FW_CONFIG_MASK_SAR = 0x7,
-	FW_CONFIG_SHIFT_SPI_SPEED = 23,
+	FW_CONFIG_SHIFT_SAR = 23,
 	/* Fan information */
 	FW_CONFIG_MASK_FAN = 0x3,
 	FW_CONFIG_SHIFT_FAN = 27,
@@ -81,6 +81,11 @@ static unsigned int extract_field(uint64_t mask, int shift)
 	return (fw_config >> shift) & mask;
 }
 
+int variant_gets_sar_config(void)
+{
+	return extract_field(FW_CONFIG_MASK_SAR, FW_CONFIG_SHIFT_SAR);
+}
+
 int variant_has_emmc(void)
 {
 	return !!extract_field(FW_CONFIG_MASK_EMMC, FW_CONFIG_SHIFT_EMMC);

src/mainboard/google/zork/variants/baseboard/include/baseboard/variants.h

@@ -59,6 +59,8 @@ const fsp_dxio_descriptor *baseboard_get_dxio_descriptors(size_t *num);
 const fsp_ddi_descriptor *baseboard_get_ddi_descriptors(size_t *num);
 
 /* Retrieve attributes from FW_CONFIG in CBI. */
+/* Return value of SAR config. */
+int variant_gets_sar_config(void);
 /* Return 0 if non-existent, 1 if present. */
 int variant_has_emmc(void);
 /* Return 0 if non-existent, 1 if present. */

src/mainboard/google/zork/variants/vilboz/variant.c

@@ -2,6 +2,8 @@
 
 #include <baseboard/variants.h>
 #include <soc/pci_devs.h>
+#include <fw_config.h>
+#include <sar.h>
 
 static const fsp_ddi_descriptor hdmi_ddi_descriptors[] = {
 	{ // DDI0, DP0, eDP
@@ -41,3 +43,50 @@ void variant_devtree_update(void)
 	if (variant_has_wwan())
 		soc_cfg->acp_i2s_use_external_48mhz_osc = 1;
 }
+
+/*
++----------+------+--------+--------+------+--+---------+--+---------+
+|          |Vilboz|Vilboz14|Vilboz14|Vilboz|NA|Vilboz360|NA|Vilboz360|
+|          |WiFi  |WiFi    |LTE     |LTE   |  |WiFi     |  |LTE      |
++----------+------+--------+--------+------+--+---------+--+---------+
+|SAR[26]   |0     |0       |0       |0     |0 |0        |0 |0        |
+|SAR[25]   |0     |0       |0       |0     |1 |1        |1 |1        |
+|SAR[24]   |0     |0       |1       |1     |0 |0        |1 |1        |
+|SAR[23]   |0     |1       |0       |1     |0 |1        |0 |1        |
++----------+------+--------+--------+------+--+---------+--+---------+
+|SAR_config|0     |1       |2       |3     |4 |5        |6 |7        |
++----------+------+--------+--------+------+--+---------+--+---------+
+*/
+
+const char *get_wifi_sar_cbfs_filename(void)
+{
+	const char *filename = NULL;
+	int sar_config;
+
+	sar_config = variant_gets_sar_config();
+
+	switch (sar_config) {
+	case 1:
+		filename = "wifi_sar-vilboz-0.hex";
+		break;
+	case 3:
+		/*
+		TODO: Set default first. It will be replaced after the
+		new table is generated.
+		*/
+		filename = "wifi_sar_defaults.hex";
+		break;
+	case 5:
+		filename = "wifi_sar-vilboz-1.hex";
+		break;
+	case 7:
+		/*
+		TODO: Set default first. It will be replaced after the
+		new table is generated.
+		*/
+		filename = "wifi_sar_defaults.hex";
+		break;
+	}
+
+	return filename;
+}