drivers: pcie: Introduce API to look up devices by ID (d01fa56f) · Commits · Wenxi XU / zephyr

drivers/pcie/host/pcie.c

+25 −0

Original line number	Diff line number	Diff line
		@@ -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 −0

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		@@ -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 −0

Original line number	Diff line number	Diff line
		@@ -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: