[S] Change in coreboot[main]: pci: Add method to read PME capability

[Lean Sheng Tan (Code Review)]

Lean Sheng Tan has submitted this change. ( https://review.coreboot.org/c/coreboot/+/84793?usp=email )

(

2 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: pci: Add method to read PME capability
......................................................................

pci: Add method to read PME capability

Add a helper method to read the PME capability.
Will be used in the following commit.

Change-Id: Id1fdc98c9ce86d3ddf8056bb609afc58008cf2e9
Signed-off-by: Patrick Rudolph 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84793
Reviewed-by: Shuo Liu 
Tested-by: build bot (Jenkins) 
Reviewed-by: Subrata Banik 
---
M src/device/pci_device.c
M src/include/device/pci.h
2 files changed, 19 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Subrata Banik: Looks good to me, approved
  Shuo Liu: Looks good to me, approved

diff --git a/src/device/pci_device.c b/src/device/pci_device.c
index a2ad2b3..d03d88d 100644
--- a/src/device/pci_device.c
+++ b/src/device/pci_device.c
@@ -1346,6 +1346,24 @@
 }

/**
+ * Returns if the device support PMEs.
+ *
+ * @param dev Pointer to the device structure.
+ * @return Returns true when the device support PMEs. The PME generation can be
+ *  disabled though.
+ */
+bool pci_has_pme_pin(const struct device *dev)
+{
+	const uint16_t cap = pci_find_capability(dev, PCI_CAP_ID_PM);
+	if (!cap)
+		return false;
+
+	const uint16_t pmecap = pci_read_config16(dev, cap + PCI_PM_PMC);
+
+	return !!(pmecap & PCI_PM_CAP_PME);
+}
+
+/**
  * PCI devices that are marked as "hidden" do not get probed. However, the same
  * initialization logic is still performed as if it were. This is useful when
  * devices would like to be described in the devicetree.cb file, and/or present
diff --git a/src/include/device/pci.h b/src/include/device/pci.h
index 2e75195..83d6628 100644
--- a/src/include/device/pci.h
+++ b/src/include/device/pci.h
@@ -98,6 +98,7 @@
 void pci_dev_init(struct device *dev);
 unsigned int pci_match_simple_dev(struct device *dev, pci_devfn_t sdev);
 uint16_t pci_find_cap_recursive(const struct device *dev, uint16_t cap);
+bool pci_has_pme_pin(const struct device *dev);

const char *pin_to_str(int pin);
 int get_pci_irq_pins(struct device *dev, struct device **parent_bdg);