diff options
Diffstat (limited to 'recipes/linux/linux-rp-2.6.23/arm-dma-coherent.patch')
| -rw-r--r-- | recipes/linux/linux-rp-2.6.23/arm-dma-coherent.patch | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/recipes/linux/linux-rp-2.6.23/arm-dma-coherent.patch b/recipes/linux/linux-rp-2.6.23/arm-dma-coherent.patch new file mode 100644 index 0000000000..2454becf66 --- /dev/null +++ b/recipes/linux/linux-rp-2.6.23/arm-dma-coherent.patch @@ -0,0 +1,361 @@ +Patch largely based on the work of Ian Molton (spyro@f2s.com). + +Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com> +Index: linux-2.6.23/arch/arm/mm/consistent.c +=================================================================== +--- linux-2.6.23.orig/arch/arm/mm/consistent.c 2007-10-10 00:31:38.000000000 +0400 ++++ linux-2.6.23/arch/arm/mm/consistent.c 2007-11-13 01:20:58.281143408 +0300 +@@ -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 <asm/memory.h> + #include <asm/cacheflush.h> ++#include <asm/io.h> + #include <asm/tlbflush.h> + #include <asm/sizes.h> + +@@ -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 @@ + 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 @@ + } + + if (dev) { ++ ++ if (dev->dma_mem) { ++ unsigned long flags; ++ int page; ++ void *ret; ++ ++ spin_lock_irqsave(&consistent_lock, flags); ++ page = bitmap_find_free_region(dev->dma_mem->bitmap, ++ dev->dma_mem->size, ++ get_order(size)); ++ spin_unlock_irqrestore(&consistent_lock, flags); ++ ++ if (page >= 0) { ++ *handle = dev->dma_mem->device_base + (page << PAGE_SHIFT); ++ ret = dev->dma_mem->virt_base + (page << PAGE_SHIFT); ++ memset(ret, 0, size); ++ return ret; ++ } ++ } ++ + mask = dev->coherent_dma_mask; + + /* +@@ -177,6 +214,9 @@ + mask, (unsigned long long)ISA_DMA_THRESHOLD); + goto no_page; + } ++ ++ if (dev->dma_mem && dev->dma_mem->flags & DMA_MEMORY_EXCLUSIVE) ++ return NULL; + } + + /* +@@ -360,6 +400,8 @@ + pte_t *ptep; + int idx; + u32 off; ++ struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; ++ unsigned long order; + + WARN_ON(irqs_disabled()); + +@@ -369,6 +411,15 @@ + } + + 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); +@@ -438,6 +489,81 @@ + } + 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 *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 = kmalloc(GFP_KERNEL, sizeof(struct dma_coherent_mem)); ++ if (!dev->dma_mem) ++ goto out; ++ memset(dev->dma_mem, 0, sizeof(struct dma_coherent_mem)); ++ dev->dma_mem->bitmap = kmalloc(GFP_KERNEL, bitmap_size); ++ if (!dev->dma_mem->bitmap) ++ goto free1_out; ++ memset(dev->dma_mem->bitmap, 0, bitmap_size); ++ ++ 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. + */ +Index: linux-2.6.23/arch/arm/common/dmabounce.c +=================================================================== +--- linux-2.6.23.orig/arch/arm/common/dmabounce.c 2007-10-10 00:31:38.000000000 +0400 ++++ linux-2.6.23/arch/arm/common/dmabounce.c 2007-11-13 01:23:17.452501736 +0300 +@@ -16,6 +16,7 @@ + * + * Copyright (C) 2002 Hewlett Packard Company. + * Copyright (C) 2004 MontaVista Software, Inc. ++ * Copyright (C) 2007 Dmitry Baryshkov <dbaryshkov@gmail.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License +@@ -29,6 +30,7 @@ + #include <linux/dma-mapping.h> + #include <linux/dmapool.h> + #include <linux/list.h> ++#include <linux/rwsem.h> + + #include <asm/cacheflush.h> + +@@ -79,6 +81,75 @@ + rwlock_t lock; + }; + ++struct dmabounce_check_entry { ++ struct list_head list; ++ dmabounce_check checker; ++ void *data; ++}; ++ ++static struct list_head checkers = LIST_HEAD_INIT(checkers); ++static rwlock_t checkers_lock = RW_LOCK_UNLOCKED; ++ ++int ++dmabounce_register_checker(dmabounce_check function, void *data) ++{ ++ unsigned long flags; ++ struct dmabounce_check_entry *entry = ++ kzalloc(sizeof(struct dmabounce_check_entry), GFP_ATOMIC); ++ ++ if (!entry) ++ return ENOMEM; ++ ++ INIT_LIST_HEAD(&entry->list); ++ entry->checker = function; ++ entry->data = data; ++ ++ write_lock_irqsave(checkers_lock, flags); ++ list_add(&entry->list, &checkers); ++ write_unlock_irqrestore(checkers_lock, flags); ++ ++ return 0; ++} ++ ++void ++dmabounce_remove_checker(dmabounce_check function, void *data) ++{ ++ unsigned long flags; ++ struct list_head *pos; ++ ++ write_lock_irqsave(checkers_lock, flags); ++ __list_for_each(pos, &checkers) { ++ struct dmabounce_check_entry *entry = container_of(pos, ++ struct dmabounce_check_entry, list); ++ if (entry->checker == function && entry->data == data) { ++ list_del(pos); ++ write_unlock_irqrestore(checkers_lock, flags); ++ kfree(entry); ++ return; ++ } ++ } ++ ++ printk(KERN_WARNING "dmabounce checker not found: %p\n", function); ++} ++ ++int dma_needs_bounce(struct device *dev, dma_addr_t dma, size_t size) ++{ ++ unsigned long flags; ++ struct list_head *pos; ++ ++ read_lock_irqsave(checkers_lock, flags); ++ __list_for_each(pos, &checkers) { ++ struct dmabounce_check_entry *entry = container_of(pos, ++ struct dmabounce_check_entry, list); ++ if (entry->checker(dev, dma, size, entry->data)) { ++ read_unlock_irqrestore(checkers_lock, flags); ++ return 1; ++ } ++ } ++ ++ read_unlock_irqrestore(checkers_lock, flags); ++ return 0; ++} + #ifdef STATS + static ssize_t dmabounce_show(struct device *dev, struct device_attribute *attr, + char *buf) +@@ -642,7 +713,6 @@ + dev->bus_id, dev->bus->name); + } + +- + EXPORT_SYMBOL(dma_map_single); + EXPORT_SYMBOL(dma_unmap_single); + EXPORT_SYMBOL(dma_map_sg); +@@ -652,6 +722,9 @@ + EXPORT_SYMBOL(dma_sync_sg); + EXPORT_SYMBOL(dmabounce_register_dev); + EXPORT_SYMBOL(dmabounce_unregister_dev); ++EXPORT_SYMBOL(dmabounce_register_checker); ++EXPORT_SYMBOL(dmabounce_remove_checker); ++ + + MODULE_AUTHOR("Christopher Hoover <ch@hpl.hp.com>, Deepak Saxena <dsaxena@plexity.net>"); + MODULE_DESCRIPTION("Special dma_{map/unmap/dma_sync}_* routines for systems with limited DMA windows"); +Index: linux-2.6.23/include/asm-arm/dma-mapping.h +=================================================================== +--- linux-2.6.23.orig/include/asm-arm/dma-mapping.h 2007-10-10 00:31:38.000000000 +0400 ++++ linux-2.6.23/include/asm-arm/dma-mapping.h 2007-11-13 01:24:05.588500474 +0300 +@@ -7,6 +7,18 @@ + + #include <asm/scatterlist.h> + ++#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 +445,10 @@ + */ + 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); ++ + #endif /* CONFIG_DMABOUNCE */ + + #endif /* __KERNEL__ */ |