On Tue, 18 Feb 2014 14:37:58 +0100, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote: > From: Josh Cartwright <joshc@xxxxxxxxxxxxxx> > > Add support for handling 'shared-dma-pool' reserved-memory nodes using > dma exclusive driver (dma_alloc_coherent()). > > Signed-off-by: Josh Cartwright <joshc@xxxxxxxxxxxxxx> > Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > --- > drivers/of/Kconfig | 7 ++++ > drivers/of/Makefile | 1 + > drivers/of/of_reserved_mem_dma.c | 65 ++++++++++++++++++++++++++++++++++++++ I don't see any reason to have this separate from of_reserved_mem.c > 3 files changed, 73 insertions(+) > create mode 100644 drivers/of/of_reserved_mem_dma.c > > diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig > index f25931dfc6db..7f00b801bcd2 100644 > --- a/drivers/of/Kconfig > +++ b/drivers/of/Kconfig > @@ -80,4 +80,11 @@ config OF_RESERVED_MEM > help > Helpers to allow for reservation of memory regions > > +config OF_RESERVED_MEM_DMA > + depends on OF_RESERVED_MEM > + depends on HAVE_GENERIC_DMA_COHERENT > + def_bool y > + help > + Helpers for reserving memory regions for DMA use > + > endmenu # OF > diff --git a/drivers/of/Makefile b/drivers/of/Makefile > index ed9660adad77..6142227ca854 100644 > --- a/drivers/of/Makefile > +++ b/drivers/of/Makefile > @@ -10,3 +10,4 @@ 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_RESERVED_MEM) += of_reserved_mem.o > +obj-$(CONFIG_OF_RESERVED_MEM_DMA) += of_reserved_mem_dma.o > diff --git a/drivers/of/of_reserved_mem_dma.c b/drivers/of/of_reserved_mem_dma.c > new file mode 100644 > index 000000000000..a3e596d1091d > --- /dev/null > +++ b/drivers/of/of_reserved_mem_dma.c > @@ -0,0 +1,65 @@ > +/* > + * Device tree based initialization code for DMA reserved regions. > + * > + * Copyright (c) 2013, The Linux Foundation. All Rights Reserved. > + * Copyright (c) 2013,2014 Samsung Electronics Co., Ltd. > + * http://www.samsung.com > + * Author: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > + * Author: Josh Cartwright <joshc@xxxxxxxxxxxxxx> > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License as > + * published by the Free Software Foundation; either version 2 of the > + * License or (at your optional) any later version of the license. > + */ > +#include <linux/memblock.h> > +#include <linux/err.h> > +#include <linux/of.h> > +#include <linux/of_fdt.h> > +#include <linux/of_platform.h> > +#include <linux/mm.h> > +#include <linux/sizes.h> > +#include <linux/mm_types.h> > +#include <linux/dma-mapping.h> > +#include <linux/of_reserved_mem.h> > + > +static void rmem_dma_device_init(struct reserved_mem *rmem, > + struct device *dev, > + struct of_phandle_args *args) > +{ > + dma_declare_coherent_memory(dev, rmem->base, rmem->base, > + rmem->size, DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE); > +} > + > +static void rmem_dma_device_release(struct reserved_mem *rmem, > + struct device *dev) > +{ > + dma_release_declared_memory(dev); > +} > + > +static const struct reserved_mem_ops rmem_dma_ops = { > + .device_init = rmem_dma_device_init, > + .device_release = rmem_dma_device_release, > +}; > + > +static int __init rmem_dma_setup(struct reserved_mem *rmem, > + unsigned long node, > + const char *uname) > +{ > + int err; > + > + if (of_get_flat_dt_prop(node, "reusable", NULL)) > + return -EINVAL; > + > + err = memblock_remove(rmem->base, rmem->size); Isn't the memblock_remove() now handled by the core code? Or am I mis-reading it? > + if (err == 0) { > + rmem->ops = &rmem_dma_ops; > + pr_info("Reserved memory: created DMA memory pool at %pa, size %ld MiB\n", > + &rmem->base, (unsigned long)rmem->size / SZ_1M); > + } else { > + pr_err("Reserved memory: unable to setup '%s' memory region for DMA.\n", > + uname); > + } > + return err; > +} > +RESERVEDMEM_OF_DECLARE(dma, "shared-dma-pool", rmem_dma_setup); > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
