drivers/pci/pci_internal.h

   1 /*
   2  * Internal PCI functions, not exported outside drivers/pci
   3  *
   4  * Copyright (c) 2015 Google, Inc
   5  * Written by Simon Glass <sjg@chromium.org>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #ifndef __pci_internal_h
  11 #define __pci_internal_h
  12
  13 /**
  14  * dm_pciauto_prescan_setup_bridge() - Set up a bridge for scanning
  15  *
  16  * This gets a bridge ready so that its downstream devices can be scanned.
  17  * It sets up the bus number and memory range registers. Once the scan is
  18  * completed, dm_pciauto_postscan_setup_bridge() should be called.
  19  *
  20  * @dev:        Bridge device to be scanned
  21  * @sub_bus:    Bus number of the 'other side' of the bridge
  22  */
  23 void dm_pciauto_prescan_setup_bridge(struct udevice *dev, int sub_bus);
  24
  25 /**
  26  * dm_pciauto_postscan_setup_bridge() - Finish set up of a bridge after scanning
  27  *
  28  * This should be called after a bus scan is complete. It adjusts the memory
  29  * ranges to fit with the devices actually found on the other side (downstream)
  30  * of the bridge.
  31  *
  32  * @dev:        Bridge device that was scanned
  33  * @sub_bus:    Bus number of the 'other side' of the bridge
  34  */
  35 void dm_pciauto_postscan_setup_bridge(struct udevice *dev, int sub_bus);
  36
  37 /**
  38  * dm_pciauto_config_device() - Configure a PCI device ready for use
  39  *
  40  * If the device is a bridge, downstream devices will be probed.
  41  *
  42  * @dev:        Device to configure
  43  * @return the maximum PCI bus number found by this device. If there are no
  44  * bridges, this just returns the device's bus number. If the device is a
  45  * bridge then it will return a larger number, depending on the devices on
  46  * that bridge. On error, returns a -ve error number.
  47  */
  48 int dm_pciauto_config_device(struct udevice *dev);
  49
  50 /**
  51  * pci_get_bus() - Get a pointer to a bus, given its number
  52  *
  53  * This looks up a PCI bus based on its bus number. The bus is probed if
  54  * necessary.
  55  *
  56  * @busnum:     PCI bus number to look up
  57  * @busp:       Returns PCI bus on success
  58  * @return 0 on success, or -ve error
  59  */
  60 int pci_get_bus(int busnum, struct udevice **busp);
  61
  62 #endif