From e251c21372c07694f547afe3c9828f7f6ef01267 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Fri, 20 Jan 2023 18:42:48 +0100 Subject: of: Introduce of_translate_dma_region() 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 Signed-off-by: Thierry Reding Link: https://lore.kernel.org/r/20230120174251.4004100-2-thierry.reding@gmail.com Signed-off-by: Joerg Roedel --- drivers/of/address.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) (limited to 'drivers/of') diff --git a/drivers/of/address.c b/drivers/of/address.c index c34ac33b7338..14f137a21b0c 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -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) { -- cgit v1.2.3