[PATCH v5 5/8] of/pci: add of_pci_dma_configure() update dma configuration
From: Murali Karicheri <hidden>
Date: 2015-01-27 21:02:40
Also in:
linux-arm-kernel, linux-iommu, linux-pci, lkml
Subsystem:
open firmware and flattened device tree, pci subsystem, the rest · Maintainers:
Rob Herring, Saravana Kannan, Bjorn Helgaas, Linus Torvalds
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. Cc: Joerg Roedel <redacted> Cc: Grant Likely <redacted> Cc: Rob Herring <redacted> Cc: Will Deacon <redacted> Cc: Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org> Cc: Arnd Bergmann <redacted> Cc: Suravee Suthikulpanit <redacted> Acked-by: Bjorn Helgaas <redacted> Signed-off-by: Murali Karicheri <redacted> --- drivers/of/of_pci.c | 19 +++++++++++++++++++ include/linux/of_pci.h | 5 +++++ 2 files changed, 24 insertions(+)
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 88471d3..0f1dd0b 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>
@@ -229,6 +230,24 @@ parse_failed: return err; } EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources); + +/** + * 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); + #endif /* CONFIG_OF_ADDRESS */ #ifdef CONFIG_PCI_MSI
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index ce0e5ab..8f1741f 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 +51,10 @@ 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)
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1.7.9.5