From 4a652eb92685ce751673858348b59286c63885dd Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Thu, 17 Oct 2024 09:22:49 +0200 Subject: 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 --- src/device/pci_device.c | 18 ++++++++++++++++++ src/include/device/pci.h | 1 + 2 files changed, 19 insertions(+) diff --git a/src/device/pci_device.c b/src/device/pci_device.c index a2ad2b3db9..d03d88df39 100644 --- a/src/device/pci_device.c +++ b/src/device/pci_device.c @@ -1345,6 +1345,24 @@ uint16_t pci_find_cap_recursive(const struct device *dev, uint16_t cap) return pos; } +/** + * 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 diff --git a/src/include/device/pci.h b/src/include/device/pci.h index 2e7519554b..83d6628fa7 100644 --- a/src/include/device/pci.h +++ b/src/include/device/pci.h @@ -98,6 +98,7 @@ void pci_dev_set_subsystem(struct device *dev, unsigned int vendor, 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); -- cgit v1.2.3