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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 <asm/cacheflush.h>
 19 #include <asm/addrspace.h>
 20 
 21 #define PREALLOC_DMA_DEBUG_ENTRIES      4096
 22 
 23 static int __init dma_init(void)
 24 {
 25         dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
 26         return 0;
 27 }
 28 fs_initcall(dma_init);
 29 
 30 void *dma_alloc_coherent(struct device *dev, size_t size,
 31                            dma_addr_t *dma_handle, gfp_t gfp)
 32 {
 33         void *ret, *ret_nocache;
 34         int order = get_order(size);
 35 
 36         if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
 37                 return ret;
 38 
 39         ret = (void *)__get_free_pages(gfp, order);
 40         if (!ret)
 41                 return NULL;
 42 
 43         memset(ret, 0, size);
 44         /*
 45          * Pages from the page allocator may have data present in
 46          * cache. So flush the cache before using uncached memory.
 47          */
 48         dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
 49 
 50         ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
 51         if (!ret_nocache) {
 52                 free_pages((unsigned long)ret, order);
 53                 return NULL;
 54         }
 55 
 56         split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
 57 
 58         *dma_handle = virt_to_phys(ret);
 59 
 60         debug_dma_alloc_coherent(dev, size, *dma_handle, ret_nocache);
 61 
 62         return ret_nocache;
 63 }
 64 EXPORT_SYMBOL(dma_alloc_coherent);
 65 
 66 void dma_free_coherent(struct device *dev, size_t size,
 67                          void *vaddr, dma_addr_t dma_handle)
 68 {
 69         int order = get_order(size);
 70         unsigned long pfn = dma_handle >> PAGE_SHIFT;
 71         int k;
 72 
 73         WARN_ON(irqs_disabled());       /* for portability */
 74 
 75         if (dma_release_from_coherent(dev, order, vaddr))
 76                 return;
 77 
 78         debug_dma_free_coherent(dev, size, vaddr, dma_handle);
 79         for (k = 0; k < (1 << order); k++)
 80                 __free_pages(pfn_to_page(pfn + k), 0);
 81         iounmap(vaddr);
 82 }
 83 EXPORT_SYMBOL(dma_free_coherent);
 84 
 85 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 86                     enum dma_data_direction direction)
 87 {
 88 #ifdef CONFIG_CPU_SH5
 89         void *p1addr = vaddr;
 90 #else
 91         void *p1addr = (void*) P1SEGADDR((unsigned long)vaddr);
 92 #endif
 93 
 94         switch (direction) {
 95         case DMA_FROM_DEVICE:           /* invalidate only */
 96                 __flush_invalidate_region(p1addr, size);
 97                 break;
 98         case DMA_TO_DEVICE:             /* writeback only */
 99                 __flush_wback_region(p1addr, size);
100                 break;
101         case DMA_BIDIRECTIONAL:         /* writeback and invalidate */
102                 __flush_purge_region(p1addr, size);
103                 break;
104         default:
105                 BUG();
106         }
107 }
108 EXPORT_SYMBOL(dma_cache_sync);
109 
110 static int __init memchunk_setup(char *str)
111 {
112         return 1; /* accept anything that begins with "memchunk." */
113 }
114 __setup("memchunk.", memchunk_setup);
115 
116 static void __init memchunk_cmdline_override(char *name, unsigned long *sizep)
117 {
118         char *p = boot_command_line;
119         int k = strlen(name);
120 
121         while ((p = strstr(p, "memchunk."))) {
122                 p += 9; /* strlen("memchunk.") */
123                 if (!strncmp(name, p, k) && p[k] == '=') {
124                         p += k + 1;
125                         *sizep = memparse(p, NULL);
126                         pr_info("%s: forcing memory chunk size to 0x%08lx\n",
127                                 name, *sizep);
128                         break;
129                 }
130         }
131 }
132 
133 int __init platform_resource_setup_memory(struct platform_device *pdev,
134                                           char *name, unsigned long memsize)
135 {
136         struct resource *r;
137         dma_addr_t dma_handle;
138         void *buf;
139 
140         r = pdev->resource + pdev->num_resources - 1;
141         if (r->flags) {
142                 pr_warning("%s: unable to find empty space for resource\n",
143                         name);
144                 return -EINVAL;
145         }
146 
147         memchunk_cmdline_override(name, &memsize);
148         if (!memsize)
149                 return 0;
150 
151         buf = dma_alloc_coherent(NULL, memsize, &dma_handle, GFP_KERNEL);
152         if (!buf) {
153                 pr_warning("%s: unable to allocate memory\n", name);
154                 return -ENOMEM;
155         }
156 
157         memset(buf, 0, memsize);
158 
159         r->flags = IORESOURCE_MEM;
160         r->start = dma_handle;
161         r->end = r->start + memsize - 1;
162         r->name = name;
163         return 0;
164 }
165 

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