diff options
| author | Will Deacon <will@kernel.org> | 2021-08-16 14:26:16 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2021-08-23 06:32:02 -0400 |
| commit | ce5cb67c664fbc93d1af20b3fbd7a07eda9f6ee6 (patch) | |
| tree | 1b8b3b9795da7b98777b0c3db634a840bb7d5f53 /drivers/of/device.c | |
| parent | a449ffaf9181b5a2dc705d8a06b13e0068207fd4 (diff) | |
of: Move of_dma_set_restricted_buffer() into device.c
Rob observes that:
| of_dma_set_restricted_buffer() [...] should also be moved to
| of/device.c. There's no reason for it to be in of/address.c. It has
| nothing to do with address parsing.
Move it to of/device.c, as he suggests.
Cc: Claire Chang <tientzu@chromium.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Robin Murphy <robin.murphy@arm.com>
Suggested-by: Rob Herring <robh+dt@kernel.org>
Link: https://lore.kernel.org/r/CAL_JsqJ7ROWWJX84x2kEex9NQ8G+2=ybRuNOobX+j8bjZzSemQ@mail.gmail.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/of/device.c')
| -rw-r--r-- | drivers/of/device.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c index 2defdca418ec..089c5b4b97fb 100644 --- a/drivers/of/device.c +++ b/drivers/of/device.c @@ -5,6 +5,7 @@ #include <linux/of_device.h> #include <linux/of_address.h> #include <linux/of_iommu.h> +#include <linux/of_reserved_mem.h> #include <linux/dma-direct.h> /* for bus_dma_region */ #include <linux/dma-map-ops.h> #include <linux/init.h> @@ -52,6 +53,39 @@ int of_device_add(struct platform_device *ofdev) return device_add(&ofdev->dev); } +static int +of_dma_set_restricted_buffer(struct device *dev, struct device_node *np) +{ + struct device_node *node, *of_node = dev->of_node; + int count, i; + + count = of_property_count_elems_of_size(of_node, "memory-region", + sizeof(u32)); + /* + * If dev->of_node doesn't exist or doesn't contain memory-region, try + * the OF node having DMA configuration. + */ + if (count <= 0) { + of_node = np; + count = of_property_count_elems_of_size( + of_node, "memory-region", sizeof(u32)); + } + + for (i = 0; i < count; i++) { + node = of_parse_phandle(of_node, "memory-region", i); + /* + * There might be multiple memory regions, but only one + * restricted-dma-pool region is allowed. + */ + if (of_device_is_compatible(node, "restricted-dma-pool") && + of_device_is_available(node)) + return of_reserved_mem_device_init_by_idx(dev, of_node, + i); + } + + return 0; +} + /** * of_dma_configure_id - Setup DMA configuration * @dev: Device to apply DMA configuration |