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dm: pci: Add APIs to find capability and extended capability

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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>
This commit is contained in:
Bin Meng 2018-08-03 01:14:52 -07:00 • committed by Simon Glass
parent 5d544f962f
commit dac01fd89d
2 changed files with 114 additions and 0 deletions
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46
include/pci.h
View file

@ -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) \