drivers/wifi/generic: Split wifi_generic_fill_ssdt into two functions

This change splits `wifi_generic_fill_ssdt()` into following two
functions:
1. `wifi_ssdt_write_device()`: This function writes the device, its
address, _UID and _DDN.

2. `wifi_ssdt_write_properties()`: This function writes the properties
for WiFi device like _PRW, regulatory domain and SAR.

This split is done so that the device write can be skipped for
CNVi devices in follow-up CLs. It will allow the SoC controller
representation for CNVi PCI device to be consistent with other
internal PCI devices in the device tree i.e. not requiring a
chip driver for the PCI device.

Because of this change, _PRW and SAR will be seen in a separate
block in SSDT disassembly, but it does not result in any functional
change.

Observed difference:
Before:
Scope (\_SB.PCI0.PBR1)
{
	Device (WF00)
	{
		Name (_UID, 0xAA6343DC)
		Name (_DDN, "WIFI Device")
		Name (_ADR, 0x0000000000000000)

		Name (_PRW, Package() { 0x08, 0x03 })
	}
}

After:
Device (\_SB.PCI0.PBR1.WF00)
{
	Name (_UID, 0xAA6343DC)
	Name (_DDN, "WIFI Device")
	Name (_ADR, 0x0000000000000000)
}

Scope (\_SB.PCI0.PBR1.WF00)
{
	Name (_PRW, Package() { 0x08, 0x03 })
}

Change-Id: I8ab5e4684492ea3b1cf749e5b9e2008e7ec8fa28
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46861
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

1 files changed, 29 insertions, 16 deletions

diff --git a/src/drivers/wifi/generic/acpi.c b/src/drivers/wifi/generic/acpi.c
index f83d04ccc1..2afd99e485 100644
--- a/src/drivers/wifi/generic/acpi.c
+++ b/src/drivers/wifi/generic/acpi.c
@@ -161,21 +161,10 @@ static void emit_sar_acpi_structures(const struct device *dev)
 	acpigen_pop_len();
 }
 
-void wifi_generic_fill_ssdt(const struct device *dev)
+static void wifi_ssdt_write_device(const struct device *dev, const char *path)
 {
-	const char *path;
-	const struct drivers_wifi_generic_config *config = dev->chip_info;
-
-	if (!dev->enabled)
-		return;
-
-	path = acpi_device_path(dev->bus->dev);
-	if (!path)
-		return;
-
 	/* Device */
-	acpigen_write_scope(path);
-	acpigen_write_device(acpi_device_name(dev));
+	acpigen_write_device(path);
 	acpi_device_write_uid(dev);
 
 	if (dev->chip_ops)
@@ -184,6 +173,16 @@ void wifi_generic_fill_ssdt(const struct device *dev)
 	/* Address */
 	acpigen_write_ADR_pci_device(dev);
 
+	acpigen_pop_len(); /* Device */
+}
+
+static void wifi_ssdt_write_properties(const struct device *dev, const char *scope)
+{
+	const struct drivers_wifi_generic_config *config = dev->chip_info;
+
+	/* Scope */
+	acpigen_write_scope(scope);
+
 	/* Wake capabilities */
 	if (config)
 		acpigen_write_PRW(config->wake, ACPI_S3);
@@ -213,11 +212,25 @@ void wifi_generic_fill_ssdt(const struct device *dev)
 	if (CONFIG(USE_SAR))
 		emit_sar_acpi_structures(dev);
 
-	acpigen_pop_len(); /* Device */
 	acpigen_pop_len(); /* Scope */
 
-	printk(BIOS_INFO, "%s.%s: %s %s\n", path, acpi_device_name(dev),
-	       dev->chip_ops ? dev->chip_ops->name : "", dev_path(dev));
+	printk(BIOS_INFO, "%s: %s %s\n", scope, dev->chip_ops ? dev->chip_ops->name : "",
+	       dev_path(dev));
+}
+
+void wifi_generic_fill_ssdt(const struct device *dev)
+{
+	const char *path;
+
+	if (!dev->enabled)
+		return;
+
+	path = acpi_device_path(dev);
+	if (!path)
+		return;
+
+	wifi_ssdt_write_device(dev, path);
+	wifi_ssdt_write_properties(dev, path);
 }
 
 const char *wifi_generic_acpi_name(const struct device *dev)