From 709c4d66e0b107ca606941b988bad717c0b45d9b Mon Sep 17 00:00:00 2001 From: Denys Dmytriyenko Date: Tue, 17 Mar 2009 14:32:59 -0400 Subject: rename packages/ to recipes/ per earlier agreement See links below for more details: http://thread.gmane.org/gmane.comp.handhelds.openembedded/21326 http://thread.gmane.org/gmane.comp.handhelds.openembedded/21816 Signed-off-by: Denys Dmytriyenko Acked-by: Mike Westerhof Acked-by: Philip Balister Acked-by: Khem Raj Acked-by: Marcin Juszkiewicz Acked-by: Koen Kooi Acked-by: Frans Meulenbroeks --- ...alloc_coherent-on-ARM-so-that-it-supports.patch | 260 +++++++++++++++++++++ 1 file changed, 260 insertions(+) create mode 100644 recipes/linux/linux-rp-2.6.24/tosa/0002-Modify-dma_alloc_coherent-on-ARM-so-that-it-supports.patch (limited to 'recipes/linux/linux-rp-2.6.24/tosa/0002-Modify-dma_alloc_coherent-on-ARM-so-that-it-supports.patch') diff --git a/recipes/linux/linux-rp-2.6.24/tosa/0002-Modify-dma_alloc_coherent-on-ARM-so-that-it-supports.patch b/recipes/linux/linux-rp-2.6.24/tosa/0002-Modify-dma_alloc_coherent-on-ARM-so-that-it-supports.patch new file mode 100644 index 0000000000..a562ef921b --- /dev/null +++ b/recipes/linux/linux-rp-2.6.24/tosa/0002-Modify-dma_alloc_coherent-on-ARM-so-that-it-supports.patch @@ -0,0 +1,260 @@ +From 8e95f90487d2fb46fd862744ddb34f47c30b0c5a Mon Sep 17 00:00:00 2001 +From: Ian Molton +Date: Fri, 4 Jan 2008 18:27:50 +0000 +Subject: [PATCH 02/64] Modify dma_alloc_coherent on ARM so that it supports device local DMA. + +--- + arch/arm/mm/consistent.c | 125 +++++++++++++++++++++++++++++++++++++++++ + include/asm-arm/dma-mapping.h | 37 +++++++------ + 2 files changed, 145 insertions(+), 17 deletions(-) + +diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c +index 333a82a..3da0f94 100644 +--- a/arch/arm/mm/consistent.c ++++ b/arch/arm/mm/consistent.c +@@ -3,6 +3,8 @@ + * + * Copyright (C) 2000-2004 Russell King + * ++ * Device local coherent memory support added by Ian Molton (spyro@f2s.com) ++ * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +@@ -20,6 +22,7 @@ + + #include + #include ++#include + #include + #include + +@@ -35,6 +38,13 @@ + #define CONSISTENT_PTE_INDEX(x) (((unsigned long)(x) - CONSISTENT_BASE) >> PGDIR_SHIFT) + #define NUM_CONSISTENT_PTES (CONSISTENT_DMA_SIZE >> PGDIR_SHIFT) + ++struct dma_coherent_mem { ++ void *virt_base; ++ u32 device_base; ++ int size; ++ int flags; ++ unsigned long *bitmap; ++}; + + /* + * These are the page tables (2MB each) covering uncached, DMA consistent allocations +@@ -153,6 +163,13 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, + unsigned long order; + u64 mask = ISA_DMA_THRESHOLD, limit; + ++ /* Following is a work-around (a.k.a. hack) to prevent pages ++ * with __GFP_COMP being passed to split_page() which cannot ++ * handle them. The real problem is that this flag probably ++ * should be 0 on ARM as it is not supported on this ++ * platform--see CONFIG_HUGETLB_PAGE. */ ++ gfp &= ~(__GFP_COMP); ++ + if (!consistent_pte[0]) { + printk(KERN_ERR "%s: not initialised\n", __func__); + dump_stack(); +@@ -160,6 +177,26 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, + } + + if (dev) { ++ ++ if (dev->dma_mem) { ++ unsigned long flags; ++ int pgnum; ++ void *ret; ++ ++ spin_lock_irqsave(&consistent_lock, flags); ++ pgnum = bitmap_find_free_region(dev->dma_mem->bitmap, ++ dev->dma_mem->size, ++ get_order(size)); ++ spin_unlock_irqrestore(&consistent_lock, flags); ++ ++ if (pgnum >= 0) { ++ *handle = dev->dma_mem->device_base + (pgnum << PAGE_SHIFT); ++ ret = dev->dma_mem->virt_base + (pgnum << PAGE_SHIFT); ++ memset(ret, 0, size); ++ return ret; ++ } ++ } ++ + mask = dev->coherent_dma_mask; + + /* +@@ -177,6 +214,9 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, + mask, (unsigned long long)ISA_DMA_THRESHOLD); + goto no_page; + } ++ ++ if (dev->dma_mem && dev->dma_mem->flags & DMA_MEMORY_EXCLUSIVE) ++ return NULL; + } + + /* +@@ -359,6 +399,8 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr + pte_t *ptep; + int idx; + u32 off; ++ struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; ++ unsigned long order; + + WARN_ON(irqs_disabled()); + +@@ -368,6 +410,15 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr + } + + size = PAGE_ALIGN(size); ++ order = get_order(size); ++ ++ /* What if mem is valid and the range is not? */ ++ if (mem && cpu_addr >= mem->virt_base && cpu_addr < (mem->virt_base + (mem->size << PAGE_SHIFT))) { ++ int page = (cpu_addr - mem->virt_base) >> PAGE_SHIFT; ++ ++ bitmap_release_region(mem->bitmap, page, order); ++ return; ++ } + + spin_lock_irqsave(&consistent_lock, flags); + c = vm_region_find(&consistent_head, (unsigned long)cpu_addr); +@@ -437,6 +488,80 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr + } + EXPORT_SYMBOL(dma_free_coherent); + ++int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, ++ dma_addr_t device_addr, size_t size, int flags) ++{ ++ void __iomem *mem_base; ++ int pages = size >> PAGE_SHIFT; ++ int bitmap_size = (pages + 31)/32; ++ ++ if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0) ++ goto out; ++ if (!size) ++ goto out; ++ if (dev->dma_mem) ++ goto out; ++ ++ /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */ ++ mem_base = ioremap_nocache(bus_addr, size); ++ if (!mem_base) ++ goto out; ++ ++ dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL); ++ if (!dev->dma_mem) ++ goto out; ++ memset(dev->dma_mem, 0, sizeof(struct dma_coherent_mem)); ++ dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL); ++ if (!dev->dma_mem->bitmap) ++ goto free1_out; ++ ++ dev->dma_mem->virt_base = mem_base; ++ dev->dma_mem->device_base = device_addr; ++ dev->dma_mem->size = pages; ++ dev->dma_mem->flags = flags; ++ ++ if (flags & DMA_MEMORY_MAP) ++ return DMA_MEMORY_MAP; ++ ++ return DMA_MEMORY_IO; ++ ++ free1_out: ++ kfree(dev->dma_mem->bitmap); ++ out: ++ 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; ++ dev->dma_mem = NULL; ++ kfree(mem->bitmap); ++ kfree(mem); ++} ++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; ++ int pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; ++ int pos, err; ++ ++ if (!mem) ++ return ERR_PTR(-EINVAL); ++ ++ pos = (device_addr - mem->device_base) >> PAGE_SHIFT; ++ err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages)); ++ if (err != 0) ++ return ERR_PTR(err); ++ return mem->virt_base + (pos << PAGE_SHIFT); ++} ++EXPORT_SYMBOL(dma_mark_declared_memory_occupied); ++ + /* + * Initialise the consistent memory allocation. + */ +diff --git a/include/asm-arm/dma-mapping.h b/include/asm-arm/dma-mapping.h +index e99406a..f18ba05 100644 +--- a/include/asm-arm/dma-mapping.h ++++ b/include/asm-arm/dma-mapping.h +@@ -7,6 +7,19 @@ + + #include + ++#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY ++extern int ++dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, ++ dma_addr_t device_addr, size_t size, int flags); ++ ++extern void ++dma_release_declared_memory(struct device *dev); ++ ++extern void * ++dma_mark_declared_memory_occupied(struct device *dev, ++ dma_addr_t device_addr, size_t size); ++ ++ + /* + * DMA-consistent mapping functions. These allocate/free a region of + * uncached, unwrite-buffered mapped memory space for use with DMA +@@ -433,23 +446,13 @@ extern int dmabounce_register_dev(struct device *, unsigned long, unsigned long) + */ + extern void dmabounce_unregister_dev(struct device *); + +-/** +- * dma_needs_bounce +- * +- * @dev: valid struct device pointer +- * @dma_handle: dma_handle of unbounced buffer +- * @size: size of region being mapped +- * +- * Platforms that utilize the dmabounce mechanism must implement +- * this function. +- * +- * The dmabounce routines call this function whenever a dma-mapping +- * is requested to determine whether a given buffer needs to be bounced +- * or not. The function must return 0 if the buffer is OK for +- * DMA access and 1 if the buffer needs to be bounced. +- * +- */ +-extern int dma_needs_bounce(struct device*, dma_addr_t, size_t); ++typedef int (*dmabounce_check)(struct device *dev, dma_addr_t dma, size_t size, void *data); ++extern int dmabounce_register_checker(dmabounce_check, void *data); ++extern void dmabounce_remove_checker(dmabounce_check, void *data); ++#ifdef CONFIG_PLATFORM_DMABOUNCE ++extern int platform_dma_needs_bounce(struct device *dev, dma_addr_t dma, size_t size, void *data); ++#endif ++ + #endif /* CONFIG_DMABOUNCE */ + + #endif /* __KERNEL__ */ +-- +1.5.3.8 + -- cgit 1.2.3-korg