1  /* SPDX-License-Identifier: GPL-2.0-only */
 2  
 3  #ifndef DEVICE_PCIEXP_H
 4  #define DEVICE_PCIEXP_H
 5  /* (c) 2005 Linux Networx GPL see COPYING for details */
 6  #include <device/pci_def.h>
 7  
 8  enum aspm_type {
 9  	PCIE_ASPM_NONE = 0,
10  	PCIE_ASPM_L0S  = 1,
11  	PCIE_ASPM_L1   = 2,
12  	PCIE_ASPM_BOTH = 3,
13  };
14  
15  #define ASPM_LTR_L12_THRESHOLD_VALUE_OFFSET 16
16  #define ASPM_LTR_L12_THRESHOLD_VALUE_MASK (0x3ff << ASPM_LTR_L12_THRESHOLD_VALUE_OFFSET)
17  #define ASPM_LTR_L12_THRESHOLD_SCALE_OFFSET 29
18  #define ASPM_LTR_L12_THRESHOLD_SCALE_MASK (0x7 << ASPM_LTR_L12_THRESHOLD_SCALE_OFFSET)
19  
20  /* Latency tolerance reporting, max non-snoop latency value 3.14ms */
21  #define PCIE_LTR_MAX_NO_SNOOP_LATENCY_3146US 0x1003
22  /* Latency tolerance reporting, max snoop latency value 3.14ms */
23  #define PCIE_LTR_MAX_SNOOP_LATENCY_3146US 0x1003
24  
25  void pciexp_scan_bus(struct bus *bus, unsigned int min_devfn,
26  			     unsigned int max_devfn);
27  
28  void pciexp_scan_bridge(struct device *dev);
29  
30  extern struct device_operations default_pciexp_ops_bus;
31  
32  void pciexp_hotplug_scan_bridge(struct device *dev);
33  
34  extern struct device_operations default_pciexp_hotplug_ops_bus;
35  
36  unsigned int pciexp_find_extended_cap(const struct device *dev, unsigned int cap,
37  				      unsigned int offset);
38  unsigned int pciexp_find_ext_vendor_cap(const struct device *dev, unsigned int cap,
39  					unsigned int offset);
40  
41  static inline bool pciexp_is_downstream_port(int type)
42  {
43  	return type == PCI_EXP_TYPE_ROOT_PORT ||
44  	       type == PCI_EXP_TYPE_DOWNSTREAM ||
45  	       type == PCI_EXP_TYPE_PCIE_BRIDGE;
46  }
47  
48  bool pciexp_dev_is_slot_hot_plug_cap(struct device *dev);
49  
50  struct device *pcie_find_dsn(const uint64_t serial, const uint16_t vid,
51  	struct device *from);
52  
53  bool pciexp_get_ltr_max_latencies(struct device *dev, u16 *max_snoop, u16 *max_nosnoop);
54  
55  #endif /* DEVICE_PCIEXP_H */