diff options
Diffstat (limited to 'drivers/of/address.c')
| -rw-r--r-- | drivers/of/address.c | 73 |
1 files changed, 32 insertions, 41 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c index da4f7341323f..eb9ab4f1e80b 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -13,6 +13,7 @@ #include <linux/sizes.h> #include <linux/slab.h> #include <linux/string.h> +#include <linux/dma-direct.h> /* for bus_dma_region */ #include "of_private.h" @@ -937,33 +938,33 @@ void __iomem *of_io_request_and_map(struct device_node *np, int index, } EXPORT_SYMBOL(of_io_request_and_map); +#ifdef CONFIG_HAS_DMA /** - * of_dma_get_range - Get DMA range info + * of_dma_get_range - Get DMA range info and put it into a map array * @np: device node to get DMA range info - * @dma_addr: pointer to store initial DMA address of DMA range - * @paddr: pointer to store initial CPU address of DMA range - * @size: pointer to store size of DMA range + * @map: dma range structure to return * * Look in bottom up direction for the first "dma-ranges" property - * and parse it. - * dma-ranges format: + * and parse it. Put the information into a DMA offset map array. + * + * dma-ranges format: * DMA addr (dma_addr) : naddr cells * CPU addr (phys_addr_t) : pna cells * size : nsize cells * - * It returns -ENODEV if "dma-ranges" property was not found - * for this device in DT. + * It returns -ENODEV if "dma-ranges" property was not found for this + * device in the DT. */ -int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size) +int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map) { struct device_node *node = of_node_get(np); const __be32 *ranges = NULL; - int len; - int ret = 0; bool found_dma_ranges = false; struct of_range_parser parser; struct of_range range; - u64 dma_start = U64_MAX, dma_end = 0, dma_offset = 0; + struct bus_dma_region *r; + int len, num_ranges = 0; + int ret = 0; while (node) { ranges = of_get_property(node, "dma-ranges", &len); @@ -989,49 +990,39 @@ int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *siz } of_dma_range_parser_init(&parser, node); + for_each_of_range(&parser, &range) + num_ranges++; + + r = kcalloc(num_ranges + 1, sizeof(*r), GFP_KERNEL); + if (!r) { + ret = -ENOMEM; + goto out; + } + /* + * Record all info in the generic DMA ranges array for struct device. + */ + *map = r; + of_dma_range_parser_init(&parser, node); for_each_of_range(&parser, &range) { pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", range.bus_addr, range.cpu_addr, range.size); - - if (dma_offset && range.cpu_addr - range.bus_addr != dma_offset) { - pr_warn("Can't handle multiple dma-ranges with different offsets on node(%pOF)\n", node); - /* Don't error out as we'd break some existing DTs */ - continue; - } if (range.cpu_addr == OF_BAD_ADDR) { pr_err("translation of DMA address(%llx) to CPU address failed node(%pOF)\n", range.bus_addr, node); continue; } - dma_offset = range.cpu_addr - range.bus_addr; - - /* Take lower and upper limits */ - if (range.bus_addr < dma_start) - dma_start = range.bus_addr; - if (range.bus_addr + range.size > dma_end) - dma_end = range.bus_addr + range.size; - } - - if (dma_start >= dma_end) { - ret = -EINVAL; - pr_debug("Invalid DMA ranges configuration on node(%pOF)\n", - node); - goto out; + r->cpu_start = range.cpu_addr; + r->dma_start = range.bus_addr; + r->size = range.size; + r->offset = range.cpu_addr - range.bus_addr; + r++; } - - *dma_addr = dma_start; - *size = dma_end - dma_start; - *paddr = dma_start + dma_offset; - - pr_debug("final: dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", - *dma_addr, *paddr, *size); - out: of_node_put(node); - return ret; } +#endif /* CONFIG_HAS_DMA */ /** * of_dma_is_coherent - Check if device is coherent |