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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef DEVICE_PCIEXP_H
#define DEVICE_PCIEXP_H
/* (c) 2005 Linux Networx GPL see COPYING for details */
enum aspm_type {
PCIE_ASPM_NONE = 0,
PCIE_ASPM_L0S = 1,
PCIE_ASPM_L1 = 2,
PCIE_ASPM_BOTH = 3,
};
#define ASPM_LTR_L12_THRESHOLD_VALUE_OFFSET 16
#define ASPM_LTR_L12_THRESHOLD_VALUE_MASK (0x3ff << ASPM_LTR_L12_THRESHOLD_VALUE_OFFSET)
#define ASPM_LTR_L12_THRESHOLD_SCALE_OFFSET 29
#define ASPM_LTR_L12_THRESHOLD_SCALE_MASK (0x7 << ASPM_LTR_L12_THRESHOLD_SCALE_OFFSET)
/* Latency tolerance reporting, max non-snoop latency value 3.14ms */
#define PCIE_LTR_MAX_NO_SNOOP_LATENCY_3146US 0x1003
/* Latency tolerance reporting, max snoop latency value 3.14ms */
#define PCIE_LTR_MAX_SNOOP_LATENCY_3146US 0x1003
void pciexp_scan_bus(struct bus *bus, unsigned int min_devfn,
unsigned int max_devfn);
void pciexp_scan_bridge(struct device *dev);
extern struct device_operations default_pciexp_ops_bus;
void pciexp_hotplug_scan_bridge(struct device *dev);
extern struct device_operations default_pciexp_hotplug_ops_bus;
unsigned int pciexp_find_extended_cap(const struct device *dev, unsigned int cap,
unsigned int offset);
unsigned int pciexp_find_ext_vendor_cap(const struct device *dev, unsigned int cap,
unsigned int offset);
static inline bool pciexp_is_downstream_port(int type)
{
return type == PCI_EXP_TYPE_ROOT_PORT ||
type == PCI_EXP_TYPE_DOWNSTREAM ||
type == PCI_EXP_TYPE_PCIE_BRIDGE;
}
struct device *pcie_find_dsn(const uint64_t serial, const uint16_t vid,
struct device *from);
bool pciexp_get_ltr_max_latencies(struct device *dev, u16 *max_snoop, u16 *max_nosnoop);
#endif /* DEVICE_PCIEXP_H */
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