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Linux/arch/sh/mm/consistent.c

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  1 /*
  2  * arch/sh/mm/consistent.c
  3  *
  4  * Copyright (C) 2004 - 2007  Paul Mundt
  5  *
  6  * Declared coherent memory functions based on arch/x86/kernel/pci-dma_32.c
  7  *
  8  * This file is subject to the terms and conditions of the GNU General Public
  9  * License.  See the file "COPYING" in the main directory of this archive
 10  * for more details.
 11  */
 12 #include <linux/mm.h>
 13 #include <linux/init.h>
 14 #include <linux/platform_device.h>
 15 #include <linux/dma-mapping.h>
 16 #include <linux/dma-debug.h>
 17 #include <linux/io.h>
 18 #include <linux/module.h>
 19 #include <linux/gfp.h>
 20 #include <asm/cacheflush.h>
 21 #include <asm/addrspace.h>
 22 
 23 #define PREALLOC_DMA_DEBUG_ENTRIES      4096
 24 
 25 struct dma_map_ops *dma_ops;
 26 EXPORT_SYMBOL(dma_ops);
 27 
 28 static int __init dma_init(void)
 29 {
 30         dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
 31         return 0;
 32 }
 33 fs_initcall(dma_init);
 34 
 35 void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 36                                  dma_addr_t *dma_handle, gfp_t gfp,
 37                                  struct dma_attrs *attrs)
 38 {
 39         void *ret, *ret_nocache;
 40         int order = get_order(size);
 41 
 42         gfp |= __GFP_ZERO;
 43 
 44         ret = (void *)__get_free_pages(gfp, order);
 45         if (!ret)
 46                 return NULL;
 47 
 48         /*
 49          * Pages from the page allocator may have data present in
 50          * cache. So flush the cache before using uncached memory.
 51          */
 52         dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
 53 
 54         ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
 55         if (!ret_nocache) {
 56                 free_pages((unsigned long)ret, order);
 57                 return NULL;
 58         }
 59 
 60         split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
 61 
 62         *dma_handle = virt_to_phys(ret);
 63 
 64         return ret_nocache;
 65 }
 66 
 67 void dma_generic_free_coherent(struct device *dev, size_t size,
 68                                void *vaddr, dma_addr_t dma_handle,
 69                                struct dma_attrs *attrs)
 70 {
 71         int order = get_order(size);
 72         unsigned long pfn = dma_handle >> PAGE_SHIFT;
 73         int k;
 74 
 75         for (k = 0; k < (1 << order); k++)
 76                 __free_pages(pfn_to_page(pfn + k), 0);
 77 
 78         iounmap(vaddr);
 79 }
 80 
 81 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 82                     enum dma_data_direction direction)
 83 {
 84         void *addr;
 85 
 86         addr = __in_29bit_mode() ?
 87                (void *)CAC_ADDR((unsigned long)vaddr) : vaddr;
 88 
 89         switch (direction) {
 90         case DMA_FROM_DEVICE:           /* invalidate only */
 91                 __flush_invalidate_region(addr, size);
 92                 break;
 93         case DMA_TO_DEVICE:             /* writeback only */
 94                 __flush_wback_region(addr, size);
 95                 break;
 96         case DMA_BIDIRECTIONAL:         /* writeback and invalidate */
 97                 __flush_purge_region(addr, size);
 98                 break;
 99         default:
100                 BUG();
101         }
102 }
103 EXPORT_SYMBOL(dma_cache_sync);
104 
105 static int __init memchunk_setup(char *str)
106 {
107         return 1; /* accept anything that begins with "memchunk." */
108 }
109 __setup("memchunk.", memchunk_setup);
110 
111 static void __init memchunk_cmdline_override(char *name, unsigned long *sizep)
112 {
113         char *p = boot_command_line;
114         int k = strlen(name);
115 
116         while ((p = strstr(p, "memchunk."))) {
117                 p += 9; /* strlen("memchunk.") */
118                 if (!strncmp(name, p, k) && p[k] == '=') {
119                         p += k + 1;
120                         *sizep = memparse(p, NULL);
121                         pr_info("%s: forcing memory chunk size to 0x%08lx\n",
122                                 name, *sizep);
123                         break;
124                 }
125         }
126 }
127 
128 int __init platform_resource_setup_memory(struct platform_device *pdev,
129                                           char *name, unsigned long memsize)
130 {
131         struct resource *r;
132         dma_addr_t dma_handle;
133         void *buf;
134 
135         r = pdev->resource + pdev->num_resources - 1;
136         if (r->flags) {
137                 pr_warning("%s: unable to find empty space for resource\n",
138                         name);
139                 return -EINVAL;
140         }
141 
142         memchunk_cmdline_override(name, &memsize);
143         if (!memsize)
144                 return 0;
145 
146         buf = dma_alloc_coherent(NULL, memsize, &dma_handle, GFP_KERNEL);
147         if (!buf) {
148                 pr_warning("%s: unable to allocate memory\n", name);
149                 return -ENOMEM;
150         }
151 
152         memset(buf, 0, memsize);
153 
154         r->flags = IORESOURCE_MEM;
155         r->start = dma_handle;
156         r->end = r->start + memsize - 1;
157         r->name = name;
158         return 0;
159 }
160 

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