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pci: add pci bus find capability interface

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Signed-off-by: lipengfei28 <lipengfei28@xiaomi.com>
This commit is contained in:
lipengfei28 2024-06-03 20:09:24 +08:00 committed by Xiang Xiao
parent 45f1597562
commit c25f839b06
2 changed files with 59 additions and 0 deletions
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36
drivers/pci/pci.c
View file

@ -1311,6 +1311,42 @@ int pci_register_controller(FAR struct pci_controller_s *ctrl)
return 0;
}
/****************************************************************************
* Name: pci_bus_find_capability
*
* Description:
* Query for devices' capabilities
*
* Tell if a device supports a given PCI capability.
*
* Input Parameters:
* bus - PCI device bus belong to
* devfn - PCI device number and function number
* cap - Capability code
*
* Returned Value:
* Returns the address of the requested capability structure within the
* device's PCI configuration space or 0 in case the device does not
* support it.
*
****************************************************************************/
uint8_t pci_bus_find_capability(FAR struct pci_bus_s *bus,
unsigned int devfn, int cap)
{
uint8_t type = 0;
uint8_t pos;
pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &type);
pos = pci_bus_find_start_cap(bus, devfn, type);
if (pos)
{
pos = pci_find_next_cap(bus, devfn, pos, cap);
}
return pos;
}
PCI_BUS_READ_CONFIG(byte, uint8_t, 1)
PCI_BUS_READ_CONFIG(word, uint16_t, 2)
PCI_BUS_READ_CONFIG(dword, uint32_t, 4)

23
include/nuttx/pci/pci.h
View file

@ -599,6 +599,29 @@ int pci_unregister_device(FAR struct pci_device_s *dev);
int pci_register_controller(FAR struct pci_controller_s *ctrl);
/****************************************************************************
* Name: pci_bus_find_capability
*
* Description:
* Query for devices' capabilities
*
* Tell if a device supports a given PCI capability.
*
* Input Parameters:
* bus - PCI device bus belong to
* devfn - PCI device number and function number
* cap - Capability code
*
* Returned Value:
* Returns the address of the requested capability structure within the
* device's PCI configuration space or 0 in case the device does not
* support it.
*
****************************************************************************/
uint8_t pci_bus_find_capability(FAR struct pci_bus_s *bus,
unsigned int devfn, int cap);
/****************************************************************************
* Name: pci_bus_read_config_byte
*