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dm: Introduce xxx_get_dma_range()

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Add the following functions to get a specific device's DMA ranges:
 - dev_get_dma_range()
 - ofnode_get_dma_range()
 - of_get_dma_range()
 - fdt_get_dma_range()
They are specially useful in oder to be able validate a physical address
space range into a bus's and to convert addresses from and to address
spaces.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
This commit is contained in:
Nicolas Saenz Julienne
2021-01-12 13:55:22 +01:00
committed by Matthias Brugger
parent c709243ee0
commit 51bdb50904
8 changed files with 234 additions and 0 deletions
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17
include/dm/of_addr.h
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@@ -44,6 +44,23 @@ u64 of_translate_address(const struct device_node *no, const __be32 *in_addr);
*/
u64 of_translate_dma_address(const struct device_node *no, const __be32 *in_addr);
/**
* of_get_dma_range() - get dma-ranges for a specific DT node
*
* Get DMA ranges for a specifc node, this is useful to perform bus->cpu and
* cpu->bus address translations
*
* @param blob Pointer to device tree blob
* @param node_offset Node DT offset
* @param cpu Pointer to variable storing the range's cpu address
* @param bus Pointer to variable storing the range's bus address
* @param size Pointer to variable storing the range's size
* @return translated DMA address or OF_BAD_ADDR on error
*/
int of_get_dma_range(const struct device_node *dev, phys_addr_t *cpu,
dma_addr_t *bus, u64 *size);
/**
* of_get_address() - obtain an address from a node
*

16
include/dm/ofnode.h
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@@ -998,6 +998,22 @@ u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr);
*/
u64 ofnode_translate_dma_address(ofnode node, const fdt32_t *in_addr);
/**
* ofnode_get_dma_range() - get dma-ranges for a specific DT node
*
* Get DMA ranges for a specifc node, this is useful to perform bus->cpu and
* cpu->bus address translations
*
* @param blob Pointer to device tree blob
* @param node_offset Node DT offset
* @param cpu Pointer to variable storing the range's cpu address
* @param bus Pointer to variable storing the range's bus address
* @param size Pointer to variable storing the range's size
* @return translated DMA address or OF_BAD_ADDR on error
*/
int ofnode_get_dma_range(ofnode node, phys_addr_t *cpu, dma_addr_t *bus,
u64 *size);
/**
* ofnode_device_is_compatible() - check if the node is compatible with compat
*

21
include/dm/read.h
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@@ -647,6 +647,21 @@ u64 dev_translate_address(const struct udevice *dev, const fdt32_t *in_addr);
u64 dev_translate_dma_address(const struct udevice *dev,
const fdt32_t *in_addr);
/**
* dev_get_dma_range() - Get a device's DMA constraints
*
* Provide the address bases and size of the linear mapping between the CPU and
* a device's BUS address space.
*
* @dev: device giving the context in which to translate the DMA address
* @cpu: base address for CPU's view of memory
* @bus: base address for BUS's view of memory
* @size: size of the address space
* @return 0 if ok, negative on error
*/
int dev_get_dma_range(const struct udevice *dev, phys_addr_t *cpu,
dma_addr_t *bus, u64 *size);
/**
* dev_read_alias_highest_id - Get highest alias id for the given stem
* @stem: Alias stem to be examined
@@ -1005,6 +1020,12 @@ static inline u64 dev_translate_dma_address(const struct udevice *dev,
return ofnode_translate_dma_address(dev_ofnode(dev), in_addr);
}
static inline int dev_get_dma_range(const struct udevice *dev, phys_addr_t *cpu,
dma_addr_t *bus, u64 *size)
{
return ofnode_get_dma_range(dev_ofnode(dev), cpu, bus, size);
}
static inline int dev_read_alias_highest_id(const char *stem)
{
if (!CONFIG_IS_ENABLED(OF_LIBFDT) || !gd->fdt_blob)

14
include/fdt_support.h
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@@ -260,6 +260,20 @@ u64 fdt_translate_address(const void *blob, int node_offset,
u64 fdt_translate_dma_address(const void *blob, int node_offset,
const __be32 *in_addr);
/**
* Get DMA ranges for a specifc node, this is useful to perform bus->cpu and
* cpu->bus address translations
*
* @param blob Pointer to device tree blob
* @param node_offset Node DT offset
* @param cpu Pointer to variable storing the range's cpu address
* @param bus Pointer to variable storing the range's bus address
* @param size Pointer to variable storing the range's size
* @return translated DMA address or OF_BAD_ADDR on error
*/
int fdt_get_dma_range(const void *blob, int node_offset, phys_addr_t *cpu,
dma_addr_t *bus, u64 *size);
int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
phys_addr_t compat_off);
int fdt_alloc_phandle(void *blob);