device: Move pci_dev_is_wake_source function

Move this function to pci_ops.c, which is already included in the smm
build. This is required to use this function in elog functionality,
which is called from SMM.

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: Ie5583c04366c9a16bc1b00a6892d39eeafe5da49
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47260
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/device/pci_ops.c

@@ -78,3 +78,21 @@ void __noreturn pcidev_die(void)
 {
 	die("PCI: dev is NULL!\n");
 }
+
+bool pci_dev_is_wake_source(const struct device *dev)
+{
+	unsigned int pm_cap;
+	uint16_t pmcs;
+
+	if (dev->path.type != DEVICE_PATH_PCI)
+		return false;
+
+	pm_cap = pci_find_capability(dev, PCI_CAP_ID_PM);
+	if (!pm_cap)
+		return false;
+
+	pmcs = pci_s_read_config16(PCI_BDF(dev), pm_cap + PCI_PM_CTRL);
+
+	/* PCI Device is a wake source if PME_ENABLE and PME_STATUS are set in PMCS register. */
+	return (pmcs & PCI_PM_CTRL_PME_ENABLE) && (pmcs & PCI_PM_CTRL_PME_STATUS);
+}