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of/address: Introduce of_dma_get_max_cpu_address()

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Introduce of_dma_get_max_cpu_address(), which provides the highest CPU
physical address addressable by all DMA masters in the system. It's
specially useful for setting memory zones sizes at early boot time.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201119175400.9995-4-nsaenzjulienne@suse.de
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Nicolas Saenz Julienne 2020-11-19 18:53:55 +01:00 • committed by Catalin Marinas
parent 9804f8c69b
commit 964db79d6c
2 changed files with 49 additions and 0 deletions
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7
include/linux/of.h
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@ -558,6 +558,8 @@ int of_map_id(struct device_node *np, u32 id,
const char *map_name, const char *map_mask_name,
struct device_node **target, u32 *id_out);
phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
#else /* CONFIG_OF */
static inline void of_core_init(void)
@ -995,6 +997,11 @@ static inline int of_map_id(struct device_node *np, u32 id,
return -EINVAL;
}
static inline phys_addr_t of_dma_get_max_cpu_address(struct device_node *np)
{
return PHYS_ADDR_MAX;
}
#define of_match_ptr(_ptr) NULL
#define of_match_node(_matches, _node) NULL
#endif /* CONFIG_OF */