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of: Introduce of_translate_dma_region()

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This function is similar to of_translate_dma_address() but also reads a
length in addition to an address from a device tree property.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20230120174251.4004100-2-thierry.reding@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Thierry Reding 2023-01-20 18:42:48 +01:00 committed by Joerg Roedel
parent bb649412d3
commit e251c21372
2 changed files with 43 additions and 0 deletions
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41
drivers/of/address.c
View File

@ -626,6 +626,47 @@ u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
}
EXPORT_SYMBOL(of_translate_dma_address);
/**
* of_translate_dma_region - Translate device tree address and size tuple
* @dev: device tree node for which to translate
* @prop: pointer into array of cells
* @start: return value for the start of the DMA range
* @length: return value for the length of the DMA range
*
* Returns a pointer to the cell immediately following the translated DMA region.
*/
const __be32 *of_translate_dma_region(struct device_node *dev, const __be32 *prop,
phys_addr_t *start, size_t *length)
{
struct device_node *parent;
u64 address, size;
int na, ns;
parent = __of_get_dma_parent(dev);
if (!parent)
return NULL;
na = of_bus_n_addr_cells(parent);
ns = of_bus_n_size_cells(parent);
of_node_put(parent);
address = of_translate_dma_address(dev, prop);
if (address == OF_BAD_ADDR)
return NULL;
size = of_read_number(prop + na, ns);
if (start)
*start = address;
if (length)
*length = size;
return prop + na + ns;
}
EXPORT_SYMBOL(of_translate_dma_region);
const __be32 *__of_get_address(struct device_node *dev, int index, int bar_no,
u64 *size, unsigned int *flags)
{

2
include/linux/of_address.h
View File

@ -38,6 +38,8 @@ struct of_pci_range {
/* Translate a DMA address from device space to CPU space */
extern u64 of_translate_dma_address(struct device_node *dev,
const __be32 *in_addr);
extern const __be32 *of_translate_dma_region(struct device_node *dev, const __be32 *addr,
phys_addr_t *start, size_t *length);
#ifdef CONFIG_OF_ADDRESS
extern u64 of_translate_address(struct device_node *np, const __be32 *addr);