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