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Commit c49b8fc2 authored by Murali Karicheri's avatar Murali Karicheri Committed by Bjorn Helgaas
Browse files

of/pci: Add of_pci_dma_configure() to update DMA configuration 



Add of_pci_dma_configure() to allow updating the DMA configuration of the
PCI device using the configuration from DT of the parent of the root bridge
device.  Use the newly added APIs pci_get/put_host_bridge_device() for
implementing this.

[bhelgaas: fold in fix for host bridges with no parent OF device]
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> (AMD Seattle)
Signed-off-by: default avatarMurali Karicheri <m-karicheri2@ti.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarRob Herring <robh+dt@kernel.org>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
CC: Joerg Roedel <joro@8bytes.org>
CC: Grant Likely <grant.likely@linaro.org>
CC: Russell King <linux@arm.linux.org.uk>
CC: Arnd Bergmann <arnd@arndb.de>
parent 6675a601

drivers/of/of_pci.c

+21 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#include <linux/export.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_device.h>

#include <linux/of_pci.h>

#include <linux/slab.h>
@@ -116,6 +117,26 @@ int of_get_pci_domain_nr(struct device_node *node) 
}

EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);



/**

 * of_pci_dma_configure - Setup DMA configuration

 * @dev: ptr to pci_dev struct of the PCI device

 *

 * Function to update PCI devices's DMA configuration using the same

 * info from the OF node of host bridge's parent (if any).

 */

void of_pci_dma_configure(struct pci_dev *pci_dev)

{

	struct device *dev = &pci_dev->dev;

	struct device *bridge = pci_get_host_bridge_device(pci_dev);



	if (!bridge->parent)

		return;



	of_dma_configure(dev, bridge->parent->of_node);

	pci_put_host_bridge_device(bridge);

}

EXPORT_SYMBOL_GPL(of_pci_dma_configure);



#if defined(CONFIG_OF_ADDRESS)

/**

 * of_pci_get_host_bridge_resources - Parse PCI host bridge resources from DT

include/linux/of_pci.h

+3 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ int of_pci_get_devfn(struct device_node *np); 
int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin);

int of_pci_parse_bus_range(struct device_node *node, struct resource *res);

int of_get_pci_domain_nr(struct device_node *node);

void of_pci_dma_configure(struct pci_dev *pci_dev);

#else

static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq)

{
@@ -50,6 +51,8 @@ of_get_pci_domain_nr(struct device_node *node) 
{

	return -1;

}



static inline void of_pci_dma_configure(struct pci_dev *pci_dev) { }

#endif



#if defined(CONFIG_OF_ADDRESS)