src/include/device/pciexp.h

   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 */