[M] Change in coreboot[master]: mb/google/rex: Add MPTS method for WWAN over PCIe

[Subrata Banik (Code Review)]

Attention is currently required from: Tarun Tuli, Kapil Porwal.

Subrata Banik has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/70229 )

Change subject: mb/google/rex: Add MPTS method for WWAN over PCIe
......................................................................

mb/google/rex: Add MPTS method for WWAN over PCIe

This patch generates the following for the mainboard:

Scope (_SB)
{
        Method (MPTS, 1, Serialized)
        {
            Local0 = _SB.PCI0.RP06.RTD3._STA ()
            If ((Local0 == One))
            {
                _SB.PCI0.RP06.PXSX.DPTS (Arg0)
            }
        }
}

Change-Id: I27ade63cfe0586aee9f03ba816b2590f14dcb610
Signed-off-by: Subrata Banik 
---
M src/mainboard/google/rex/mainboard.c
M src/mainboard/google/rex/variants/rex0/overridetree.cb
2 files changed, 58 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/29/70229/1

diff --git a/src/mainboard/google/rex/mainboard.c b/src/mainboard/google/rex/mainboard.c
index f61af2c..bb64c63 100644
--- a/src/mainboard/google/rex/mainboard.c
+++ b/src/mainboard/google/rex/mainboard.c
@@ -5,10 +5,13 @@
 #include <baseboard/gpio.h>
 #include <baseboard/variants.h>
 #include <device/device.h>
+#include <drivers/wwan/fm/chip.h>
 #include <ec/ec.h>
 #include <fw_config.h>
 #include <vendorcode/google/chromeos/chromeos.h>

+WEAK_DEV_PTR(rp6_wwan);
+
 static void mainboard_init(void *chip_info)
 {
    const struct pad_config *pads;
@@ -47,8 +50,38 @@
    acpigen_write_if_end();
 }

+static void mainboard_generate_wwan_shutdown(const struct device *dev)
+{
+	const struct drivers_wwan_fm_config *config = config_of(dev);
+	const struct device *parent = dev->bus->dev;
+
+	if (!config)
+		return;
+	if (config->rtd3dev) {
+		acpigen_write_store();
+		acpigen_emit_namestring(acpi_device_path_join(parent, "RTD3._STA"));
+		acpigen_emit_byte(LOCAL0_OP);
+		acpigen_write_if_lequal_op_int(LOCAL0_OP, ONE_OP);
+		{
+			acpigen_emit_namestring(acpi_device_path_join(dev, "DPTS"));
+			acpigen_emit_byte(ARG0_OP);
+		}
+		acpigen_write_if_end();
+	}
+}
+
 static void mainboard_fill_ssdt(const struct device *dev)
 {
+	const struct device *wwan = DEV_PTR(rp6_wwan);
+
+	if (wwan) {
+		acpigen_write_scope("\_SB");
+		acpigen_write_method_serialized("MPTS", 1);
+		mainboard_generate_wwan_shutdown(wwan);
+		acpigen_write_method_end(); /* Method */
+		acpigen_write_scope_end(); /* Scope */
+	}
+
    acpigen_write_scope("\_SB");
    acpigen_write_method_serialized("MS0X", 1);
    mainboard_generate_s0ix_hook();
diff --git a/src/mainboard/google/rex/variants/rex0/overridetree.cb b/src/mainboard/google/rex/variants/rex0/overridetree.cb
index 8d1d528..97b8b84 100644
--- a/src/mainboard/google/rex/variants/rex0/overridetree.cb
+++ b/src/mainboard/google/rex/variants/rex0/overridetree.cb
@@ -468,7 +468,7 @@
    			register "wake_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_F10)"
    			register "add_acpi_dma_property" = "true"
    			use rp6_rtd3 as rtd3dev
-				device generic 0 on end
+				device generic 0 alias rp6_wwan on end
    		end
    	end	#PCIE6 WWAN card
    	device ref gspi1 on