This code was based on: "arch/microblaze/kernel/prom_parse.c" "arch/powerpc/kernel/prom_parse.c" "ibm," prefix could be supported with some modification. Signed-off-by: Hiroshi DOYU <hdoyu@xxxxxxxxxx> Cc: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx> --- drivers/of/Kconfig | 4 ++ drivers/of/Makefile | 1 + drivers/of/of_dma.c | 70 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/of_address.h | 13 ++++++++ 4 files changed, 88 insertions(+), 0 deletions(-) diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index dfba3e6..3b0298b 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -83,4 +83,8 @@ config OF_MTD depends on MTD def_bool y +config OF_DMA + depends on HAS_DMA + def_bool y + endmenu # OF diff --git a/drivers/of/Makefile b/drivers/of/Makefile index e027f44..711ff5b 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_OF_MDIO) += of_mdio.o obj-$(CONFIG_OF_PCI) += of_pci.o obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o obj-$(CONFIG_OF_MTD) += of_mtd.o +obj-$(CONFIG_OF_DMA) += of_dma.o diff --git a/drivers/of/of_dma.c b/drivers/of/of_dma.c new file mode 100644 index 0000000..4869e29 --- /dev/null +++ b/drivers/of/of_dma.c @@ -0,0 +1,70 @@ +/* + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * + * Based on: + * "arch/microblaze/kernel/prom_parse.c" + * "arch/powerpc/kernel/prom_parse.c" + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/export.h> +#include <linux/of_address.h> + +int of_get_dma_window(struct device_node *dn, + const char *propname, int index, + unsigned long *busno, + dma_addr_t *addr, size_t *size) +{ + const __be32 *dma_window, *end; + int bytes, cur_index = 0; + + if (!dn || !addr || !size) + return -EINVAL; + + if (!propname) + propname = "dma-window"; + + dma_window = of_get_property(dn, propname, &bytes); + if (!dma_window) + return -ENODEV; + end = dma_window + bytes / sizeof(*dma_window); + + while (dma_window < end) { + u32 cells; + const void *prop; + + /* busno is always one cell */ + if (busno) + *busno = be32_to_cpup(dma_window++); + + prop = of_get_property(dn, "#dma-address-cells", NULL); + if (!prop) + prop = of_get_property(dn, "#address-cells", NULL); + + cells = prop ? be32_to_cpup(prop) : of_n_addr_cells(dn); + if (!cells) + return -EINVAL; + *addr = of_read_number(dma_window, cells); + dma_window += cells; + + prop = of_get_property(dn, "#dma-size-cells", NULL); + cells = prop ? be32_to_cpup(prop) : of_n_size_cells(dn); + if (!cells) + return -EINVAL; + *size = of_read_number(dma_window, cells); + dma_window += cells; + + if (cur_index++ == index) + break; + } + return 0; +} +EXPORT_SYMBOL(of_parse_dma_window); diff --git a/include/linux/of_address.h b/include/linux/of_address.h index 01b925a..9d9da9d 100644 --- a/include/linux/of_address.h +++ b/include/linux/of_address.h @@ -21,6 +21,11 @@ extern void __iomem *of_iomap(struct device_node *device, int index); extern const u32 *of_get_address(struct device_node *dev, int index, u64 *size, unsigned int *flags); +extern int of_get_dma_window(struct device_node *dev, + const char *propname, int index, + unsigned long *busno, + dma_addr_t *phys, size_t *size); + #ifndef pci_address_to_pio static inline unsigned long pci_address_to_pio(phys_addr_t addr) { return -1; } #define pci_address_to_pio pci_address_to_pio @@ -48,6 +53,14 @@ static inline const u32 *of_get_address(struct device_node *dev, int index, { return NULL; } + +extern int of_get_dma_window(struct device_node *dev, + const char *propname, int index, + unsigned long *busno, + dma_addr_t *phys, size_t *size) +{ + return 0; +} #endif /* CONFIG_OF_ADDRESS */ -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html