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drivers: pcie: Introduce API to look up devices by ID

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In some cases we cannot know the BDF up-front, so provide a way to
look it up based on the vendor and device ID.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Johan Hedberg 2021-02-04 13:14:29 +02:00 committed by Anas Nashif
parent 14da6014a3
commit d01fa56f6a
3 changed files with 38 additions and 0 deletions
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25
drivers/pcie/host/pcie.c
View file

@ -229,3 +229,28 @@ void pcie_irq_enable(pcie_bdf_t bdf, unsigned int irq)
#endif
irq_enable(irq);
}
pcie_bdf_t pcie_bdf_lookup(pcie_id_t id)
{
int bus, dev, func;
for (bus = 0; bus <= PCIE_MAX_BUS; bus++) {
for (dev = 0; dev <= PCIE_MAX_DEV; dev++) {
for (func = 0; func <= PCIE_MAX_FUNC; func++) {
pcie_bdf_t bdf = PCIE_BDF(bus, dev, func);
uint32_t data;
data = pcie_conf_read(bdf, PCIE_CONF_ID);
if (data == PCIE_ID_NONE) {
continue;
}
if (data == id) {
return bdf;
}
}
}
}
return PCIE_BDF_NONE;
}

11
include/drivers/pcie/pcie.h
View file

@ -45,6 +45,17 @@ struct pcie_mbar {
* These functions are arch-, board-, or SoC-specific.
*/
/**
* @brief Look up the BDF based on PCI(e) vendor & device ID
*
* This function is used to look up the BDF for a device given its
* vendor and device ID.
*
* @param id PCI(e) vendor & device ID encoded using PCIE_ID()
* @return The BDF for the device, or PCIE_BDF_NONE if it was not found
*/
extern pcie_bdf_t pcie_bdf_lookup(pcie_id_t id);
/**
* @brief Read a 32-bit word from an endpoint's configuration space.
*

2
include/dt-bindings/pcie/pcie.h
View file

@ -35,6 +35,8 @@
#define PCIE_ID_NONE PCIE_ID(0xFFFF, 0xFFFF)
#define PCIE_BDF_NONE 0xFFFFFFFFU
/*
* Since our internal representation of bus/device/function is arbitrary,
* we choose the same format employed in the x86 Configuration Address Port: