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.
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> (AMD Seattle)
Signed-off-by: Murali Karicheri <m-karicheri2@xxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Acked-by: Rob Herring <robh+dt@xxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
CC: Joerg Roedel <joro@xxxxxxxxxx>
CC: Grant Likely <grant.likely@xxxxxxxxxx>
CC: Russell King <linux@xxxxxxxxxxxxxxxx>
CC: Arnd Bergmann <arnd@xxxxxxxx>
---
drivers/of/of_pci.c | 18 ++++++++++++++++++
include/linux/of_pci.h | 3 +++
2 files changed, 21 insertions(+)
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 62426d8..86d3c38 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -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 +117,23 @@ 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 root host bridge's parent.
+ */
+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);
+
+ 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
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index ce0e5ab..29fd3fe 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -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)
--
1.7.9.5
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