diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2018-10-15 02:21:21 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2018-11-14 09:16:28 -0800 |
| commit | a8c5f8d3d02807f72d048950d72b0c73d55bd7fb (patch) | |
| tree | d87519b5395d70034c2c9647f44b1cf70d019f70 /include | |
| parent | c80c7798cfc6032ce6522aded6048f1d3fe93fce (diff) | |
| download | u-boot-a8c5f8d3d02807f72d048950d72b0c73d55bd7fb.tar.gz | |
dm: pci: Add APIs to find next capability and extended capability
This introduces two new APIs dm_pci_find_next_capability() and
dm_pci_find_next_ext_capability() to get PCI capability address
and PCI express extended capability address for a given PCI device
starting from a given offset.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/pci.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/include/pci.h b/include/pci.h index 938a8390cb..785d7d28b7 100644 --- a/include/pci.h +++ b/include/pci.h @@ -1313,6 +1313,29 @@ pci_addr_t dm_pci_phys_to_bus(struct udevice *dev, phys_addr_t addr, void *dm_pci_map_bar(struct udevice *dev, int bar, int flags); /** + * dm_pci_find_next_capability() - find a capability starting from an offset + * + * Tell if a device supports a given PCI capability. Returns the + * address of the requested capability structure within the device's + * PCI configuration space or 0 in case the device does not support it. + * + * Possible values for @cap: + * + * %PCI_CAP_ID_MSI Message Signalled Interrupts + * %PCI_CAP_ID_PCIX PCI-X + * %PCI_CAP_ID_EXP PCI Express + * %PCI_CAP_ID_MSIX MSI-X + * + * See PCI_CAP_ID_xxx for the complete capability ID codes. + * + * @dev: PCI device to query + * @start: offset to start from + * @cap: capability code + * @return: capability address or 0 if not supported + */ +int dm_pci_find_next_capability(struct udevice *dev, u8 start, int cap); + +/** * dm_pci_find_capability() - find a capability * * Tell if a device supports a given PCI capability. Returns the @@ -1335,6 +1358,31 @@ void *dm_pci_map_bar(struct udevice *dev, int bar, int flags); int dm_pci_find_capability(struct udevice *dev, int cap); /** + * dm_pci_find_next_ext_capability() - find an extended capability + * starting from an offset + * + * Tell if a device supports a given PCI express extended capability. + * Returns the address of the requested extended capability structure + * within the device's PCI configuration space or 0 in case the device + * does not support it. + * + * Possible values for @cap: + * + * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting + * %PCI_EXT_CAP_ID_VC Virtual Channel + * %PCI_EXT_CAP_ID_DSN Device Serial Number + * %PCI_EXT_CAP_ID_PWR Power Budgeting + * + * See PCI_EXT_CAP_ID_xxx for the complete extended capability ID codes. + * + * @dev: PCI device to query + * @start: offset to start from + * @cap: extended capability code + * @return: extended capability address or 0 if not supported + */ +int dm_pci_find_next_ext_capability(struct udevice *dev, int start, int cap); + +/** * dm_pci_find_ext_capability() - find an extended capability * * Tell if a device supports a given PCI express extended capability. |