diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2018-08-03 01:14:52 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2018-08-08 12:49:31 +0100 |
| commit | dac01fd89d41d98cd4ce040a0d10eb67c523f63a (patch) | |
| tree | f230ada01af1198cdfcfadfafa03fe6107235eba /include/pci.h | |
| parent | 5d544f962f7b970c118eaa13f1b874572ab5c28f (diff) | |
dm: pci: Add APIs to find capability and extended capability
This introduces two new APIs dm_pci_find_capability() and
dm_pci_find_ext_capability() to get PCI capability address and
PCI express extended capability address for a given PCI device.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/pci.h')
| -rw-r--r-- | include/pci.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/include/pci.h b/include/pci.h index 83a40a5adf..938a8390cb 100644 --- a/include/pci.h +++ b/include/pci.h @@ -17,6 +17,7 @@ * Under PCI, each device has 256 bytes of configuration address space, * of which the first 64 bytes are standardized as follows: */ +#define PCI_STD_HEADER_SIZEOF 64 #define PCI_VENDOR_ID 0x00 /* 16 bits */ #define PCI_DEVICE_ID 0x02 /* 16 bits */ #define PCI_COMMAND 0x04 /* 16 bits */ @@ -1311,6 +1312,51 @@ 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_capability() - find a capability + * + * 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 + * @cap: capability code + * @return: capability address or 0 if not supported + */ +int dm_pci_find_capability(struct udevice *dev, int cap); + +/** + * dm_pci_find_ext_capability() - find an extended capability + * + * 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 + * @cap: extended capability code + * @return: extended capability address or 0 if not supported + */ +int dm_pci_find_ext_capability(struct udevice *dev, int cap); + #define dm_pci_virt_to_bus(dev, addr, flags) \ dm_pci_phys_to_bus(dev, (virt_to_phys(addr)), (flags)) #define dm_pci_bus_to_virt(dev, addr, flags, len, map_flags) \ |