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pci: add find device from bus

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Signed-off-by: lipengfei28 <lipengfei28@xiaomi.com>
This commit is contained in:
lipengfei28 2024-06-04 19:50:33 +08:00 committed by Xiang Xiao
parent 9dc9500aaf
commit 3250625a15
2 changed files with 83 additions and 0 deletions
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63
drivers/pci/pci.c
View file

@ -129,6 +129,34 @@ static struct list_node g_pci_ctrl_list =
* Private Functions
****************************************************************************/
static FAR struct pci_device_s *
pci_do_find_device_from_bus(FAR struct pci_bus_s *bus, uint8_t busno,
unsigned int devfn)
{
FAR struct pci_bus_s *bus_tmp;
FAR struct pci_device_s *dev;
list_for_every_entry(&bus->devices, dev, struct pci_device_s, node)
{
if (dev->bus->number == busno && devfn == dev->devfn)
{
return dev;
}
}
list_for_every_entry(&bus->children, bus_tmp,
struct pci_bus_s, node)
{
dev = pci_find_device_from_bus(bus_tmp, busno, devfn);
if (dev != NULL)
{
return dev;
}
}
return NULL;
}
/****************************************************************************
* Name: pci_change_master
*
@ -782,6 +810,41 @@ static void pci_scan_bus(FAR struct pci_bus_s *bus)
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pci_find_device_from_bus
*
* Description:
* To find a PCI device from the bus
*
* Input Parameters:
* bus - pci bus
* busno - bus number
* devfn - device number and function number
*
* Returned Value:
* Failed if return NULL, otherwise return pci devices
*
****************************************************************************/
FAR struct pci_device_s *
pci_find_device_from_bus(FAR struct pci_bus_s *bus, uint8_t busno,
unsigned int devfn)
{
FAR struct pci_device_s *dev;
int ret;
ret = nxmutex_lock(&g_pci_lock);
if (ret < 0)
{
return NULL;
}
dev = pci_do_find_device_from_bus(bus, busno, devfn);
nxmutex_unlock(&g_pci_lock);
return dev;
}
/****************************************************************************
* Name: pci_bus_read_config
*

20
include/nuttx/pci/pci.h
View file

@ -742,6 +742,26 @@ int pci_bus_write_config_word(FAR struct pci_bus_s *bus, unsigned int devfn,
int pci_bus_write_config_dword(FAR struct pci_bus_s *bus, unsigned int devfn,
int where, uint32_t val);
/****************************************************************************
* Name: pci_find_device_from_bus
*
* Description:
* To find a PCI device from the bus
*
* Input Parameters:
* bus - pci bus
* busno - bus number
* devfn - device number and function number
*
* Returned Value:
* Failed if return NULL, otherwise return pci devices
*
****************************************************************************/
FAR struct pci_device_s *
pci_find_device_from_bus(FAR struct pci_bus_s *bus, uint8_t busno,
unsigned int devfn);
/****************************************************************************
* Name: pci_register_drivers
*