On 7/14/2014 12:12 AM, Marek Szyprowski wrote:
Add support for handling 'shared-dma-pool' reserved-memory device tree nodes.
Based on previous code provided by Josh Cartwright joshc@codeaurora.org
Signed-off-by: Marek Szyprowski m.szyprowski@samsung.com
drivers/base/dma-coherent.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+)
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c index 7d6e84a51424..b20cbe095d86 100644 --- a/drivers/base/dma-coherent.c +++ b/drivers/base/dma-coherent.c @@ -218,3 +218,43 @@ int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma, return 0; } EXPORT_SYMBOL(dma_mmap_from_coherent);
+/*
- Support for reserved memory regions defined in device tree
- */
+#ifdef CONFIG_OF_RESERVED_MEM +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/of_reserved_mem.h>
+static void rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev) +{
- 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 = rmem->fdt_node;
- if (of_get_flat_dt_prop(node, "reusable", NULL))
return -EINVAL;
Can we add a check for 'no-map' property here? At least on ARM, the lack of the no-map property causes the ioremap to fail.
Thanks, Laura