litmus-rt.git - The LITMUS^RT kernel.

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author	Tony Lindgren <tony@atomide.com>	2012-08-31 19:08:07 -0400
committer	Tony Lindgren <tony@atomide.com>	2012-09-12 21:06:31 -0400
commit	c49f34bc25900c3c6638fed0987c9abea3c212ea (patch)
tree	e1686e3c2cf56aee878fe3a725d4f7651464ec91 /arch/arm/lib/delay.c
parent	dbc04161048dd5e5c3c58546688a0cc0854051e9 (diff)

ARM: OMAP2+ Move SoC specific headers to be local to mach-omap2

These can now be moved to be local headers in mach-omap2. Note that this patch removes arch/arm/plat-omap/devices.c as it will get removed anyways with Paul Walmsley's patch "ARM: OMAP: split OMAP1, OMAP2+ RNG device registration". Signed-off-by: Tony Lindgren <tony@atomide.com>

Diffstat (limited to 'arch/arm/lib/delay.c')

0 files changed, 0 insertions, 0 deletions

/* * Coherent per-device memory handling. * Borrowed from i386 */ #include <linux/io.h> #include <linux/slab.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/dma-mapping.h> struct dma_coherent_mem { void *virt_base; dma_addr_t device_base; unsigned long pfn_base; int size; int flags; unsigned long *bitmap; spinlock_t spinlock; }; static bool dma_init_coherent_memory( phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags, struct dma_coherent_mem **mem) { struct dma_coherent_mem *dma_mem = NULL; void __iomem *mem_base = NULL; int pages = size >> PAGE_SHIFT; int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0) goto out; if (!size) goto out; if (flags & DMA_MEMORY_MAP) mem_base = memremap(phys_addr, size, MEMREMAP_WC); else mem_base = ioremap(phys_addr, size); if (!mem_base) goto out; dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL); if (!dma_mem) goto out; dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL); if (!dma_mem->bitmap) goto out; dma_mem->virt_base = mem_base; dma_mem->device_base = device_addr; dma_mem->pfn_base = PFN_DOWN(phys_addr); dma_mem->size = pages; dma_mem->flags = flags; spin_lock_init(&dma_mem->spinlock); *mem = dma_mem; return true; out: kfree(dma_mem); if (mem_base) { if (flags & DMA_MEMORY_MAP) memunmap(mem_base); else iounmap(mem_base); } return false; } static void dma_release_coherent_memory(struct dma_coherent_mem *mem) { if (!mem) return; if (mem->flags & DMA_MEMORY_MAP) memunmap(mem->virt_base); else iounmap(mem->virt_base); kfree(mem->bitmap); kfree(mem); } static int dma_assign_coherent_memory(struct device *dev, struct dma_coherent_mem *mem) { if (dev->dma_mem) return -EBUSY; dev->dma_mem = mem; /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */ return 0; } int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags) { struct dma_coherent_mem *mem; if (!dma_init_coherent_memory(phys_addr, device_addr, size, flags, &mem)) return 0; if (dma_assign_coherent_memory(dev, mem) == 0) return flags & DMA_MEMORY_MAP ? DMA_MEMORY_MAP : DMA_MEMORY_IO; dma_release_coherent_memory(mem); return 0; } EXPORT_SYMBOL(dma_declare_coherent_memory); void dma_release_declared_memory(struct device *dev) { struct dma_coherent_mem *mem = dev->dma_mem; if (!mem) return; dma_release_coherent_memory(mem); dev->dma_mem = NULL; } EXPORT_SYMBOL(dma_release_declared_memory); void *dma_mark_declared_memory_occupied(struct device *dev, dma_addr_t device_addr, size_t size) { struct dma_coherent_mem *mem = dev->dma_mem; unsigned long flags; int pos, err; size += device_addr & ~PAGE_MASK; if (!mem) return ERR_PTR(-EINVAL); spin_lock_irqsave(&mem->spinlock, flags); pos = (device_addr - mem->device_base) >> PAGE_SHIFT; err = bitmap_allocate_region(mem->bitmap, pos, get_order(size)); spin_unlock_irqrestore(&mem->spinlock, flags); if (err != 0) return ERR_PTR(err); return mem->virt_base + (pos << PAGE_SHIFT); } EXPORT_SYMBOL(dma_mark_declared_memory_occupied); /** * dma_alloc_from_coherent() - try to allocate memory from the per-device coherent area * * @dev: device from which we allocate memory * @size: size of requested memory area * @dma_handle: This will be filled with the correct dma handle * @ret: This pointer will be filled with the virtual address * to allocated area. * * This function should be only called from per-arch dma_alloc_coherent() * to support allocation from per-device coherent memory pools. * * Returns 0 if dma_alloc_coherent should continue with allocating from * generic memory areas, or !0 if dma_alloc_coherent should return @ret. */ int dma_alloc_from_coherent(struct device *dev, ssize_t size, dma_addr_t *dma_handle, void **ret) { struct dma_coherent_mem *mem; int order = get_order(size); unsigned long flags; int pageno; if (!dev) return 0; mem = dev->dma_mem; if (!mem) return 0; *ret = NULL; spin_lock_irqsave(&mem->spinlock, flags); if (unlikely(size > (mem->size << PAGE_SHIFT))) goto err; pageno = bitmap_find_free_region(mem->bitmap, mem->size, order); if (unlikely(pageno < 0)) goto err; /* * Memory was found in the per-device area. */ *dma_handle = mem->device_base + (pageno << PAGE_SHIFT); *ret = mem->virt_base + (pageno << PAGE_SHIFT); if (mem->flags & DMA_MEMORY_MAP) memset(*ret, 0, size); else memset_io(*ret, 0, size); spin_unlock_irqrestore(&mem->spinlock, flags); return 1; err: spin_unlock_irqrestore(&mem->spinlock, flags); /* * In the case where the allocation can not be satisfied from the * per-device area, try to fall back to generic memory if the * constraints allow it. */ return mem->flags & DMA_MEMORY_EXCLUSIVE; } EXPORT_SYMBOL(dma_alloc_from_coherent); /** * dma_release_from_coherent() - try to free the memory allocated from per-device coherent memory pool * @dev: device from which the memory was allocated * @order: the order of pages allocated * @vaddr: virtual address of allocated pages * * This checks whether the memory was allocated from the per-device * coherent memory pool and if so, releases that memory. * * Returns 1 if we correctly released the memory, or 0 if * dma_release_coherent() should proceed with releasing memory from * generic pools. */ int dma_release_from_coherent(struct device *dev, int order, void *vaddr) { struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; if (mem && vaddr >= mem->virt_base && vaddr < (mem->virt_base + (mem->size << PAGE_SHIFT))) {


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