On Thu, Apr 24, 2014 at 10:30 AM, Santosh Shilimkar <santosh.shilimkar@xxxxxx> wrote: > From: Grygorii Strashko <grygorii.strashko@xxxxxx> > > The of_dma_get_range() allows to find "dma-range" property for > the specified device and parse it. > dma-ranges format: > DMA addr (dma_addr) : naddr cells > CPU addr (phys_addr_t) : pna cells > size : nsize cells > > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Cc: Russell King <linux@xxxxxxxxxxxxxxxx> > Cc: Arnd Bergmann <arnd@xxxxxxxx> > Cc: Olof Johansson <olof@xxxxxxxxx> > Cc: Grant Likely <grant.likely@xxxxxxxxxx> > Cc: Rob Herring <robh+dt@xxxxxxxxxx> > Cc: Catalin Marinas <catalin.marinas@xxxxxxx> > Cc: Linus Walleij <linus.walleij@xxxxxxxxxx> > Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx> > Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx> Reviewed-by: Rob Herring <robh@xxxxxxxxxx> > --- > drivers/of/address.c | 87 ++++++++++++++++++++++++++++++++++++++++++++ > include/linux/of_address.h | 8 ++++ > 2 files changed, 95 insertions(+) > > diff --git a/drivers/of/address.c b/drivers/of/address.c > index cb4242a..c54baee 100644 > --- a/drivers/of/address.c > +++ b/drivers/of/address.c > @@ -721,3 +721,90 @@ void __iomem *of_iomap(struct device_node *np, int index) > return ioremap(res.start, resource_size(&res)); > } > EXPORT_SYMBOL(of_iomap); > + > +/** > + * of_dma_get_range - Get DMA range info > + * @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 > + * > + * Look in bottom up direction for the first "dma-ranges" property > + * and parse it. > + * 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. > + */ > +int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size) > +{ > + struct device_node *node = of_node_get(np); > + const __be32 *ranges = NULL; > + int len, naddr, nsize, pna; > + int ret = 0; > + u64 dmaaddr; > + > + if (!node) > + return -EINVAL; > + > + while (1) { > + naddr = of_n_addr_cells(node); > + nsize = of_n_size_cells(node); > + node = of_get_next_parent(node); > + if (!node) > + break; > + > + ranges = of_get_property(node, "dma-ranges", &len); > + > + /* Ignore empty ranges, they imply no translation required */ > + if (ranges && len > 0) > + break; > + > + /* > + * At least empty ranges has to be defined for parent node if > + * DMA is supported > + */ > + if (!ranges) > + break; > + } > + > + if (!ranges) { > + pr_debug("%s: no dma-ranges found for node(%s)\n", > + __func__, np->full_name); > + ret = -ENODEV; > + goto out; > + } > + > + len /= sizeof(u32); > + > + pna = of_n_addr_cells(node); > + > + /* dma-ranges format: > + * DMA addr : naddr cells > + * CPU addr : pna cells > + * size : nsize cells > + */ > + dmaaddr = of_read_number(ranges, naddr); > + *paddr = of_translate_dma_address(np, ranges); > + if (*paddr == OF_BAD_ADDR) { > + pr_err("%s: translation of DMA address(%pad) to CPU address failed node(%s)\n", > + __func__, dma_addr, np->full_name); > + ret = -EINVAL; > + goto out; > + } > + *dma_addr = dmaaddr; > + > + *size = of_read_number(ranges + naddr + pna, nsize); > + > + pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", > + *dma_addr, *paddr, *size); > + > +out: > + of_node_put(node); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(of_dma_get_range); > diff --git a/include/linux/of_address.h b/include/linux/of_address.h > index 5f6ed6b..4d7b325 100644 > --- a/include/linux/of_address.h > +++ b/include/linux/of_address.h > @@ -63,6 +63,8 @@ extern int of_pci_range_parser_init(struct of_pci_range_parser *parser, > extern struct of_pci_range *of_pci_range_parser_one( > struct of_pci_range_parser *parser, > struct of_pci_range *range); > +extern int of_dma_get_range(struct device_node *np, u64 *dma_addr, > + u64 *paddr, u64 *size); > #else /* CONFIG_OF_ADDRESS */ > static inline struct device_node *of_find_matching_node_by_address( > struct device_node *from, > @@ -90,6 +92,12 @@ static inline struct of_pci_range *of_pci_range_parser_one( > { > return NULL; > } > + > +static inline int of_dma_get_range(struct device_node *np, u64 *dma_addr, > + u64 *paddr, u64 *size) > +{ > + return -ENODEV; > +} > #endif /* CONFIG_OF_ADDRESS */ > > #ifdef CONFIG_OF > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html