display-training: util/buffer.c Source File

00001 
00038 #include <buffer.h>
00039 #include <mempool.h>
00040 #include <physmem.h>
00041 
00042 static struct mem_pool  buffer_pool;
00043 
00049 struct buffer *buffer_alloc(void)
00050 {
00051         struct buffer   *buf;
00052 
00053         buf = mem_pool_alloc(&buffer_pool);
00054         buf->dma_desc = NULL;
00055 
00056         return buf;
00057 }
00058 
00062 void buffer_free(struct buffer *buf)
00063 {
00064         mem_pool_free(&buffer_pool, buf);
00065 }
00066 
00071 void buffer_resize(struct buffer *buf, size_t new_size)
00072 {
00073         assert(buf);
00074 
00075         buf->len = new_size;
00076 }
00077 
00078 #ifdef CONFIG_DMAPOOL_GENERIC_POOLS
00079 
00080 #include <dmapool.h>
00081 
00092 struct buffer *buffer_dma_alloc(size_t size)
00093 {
00094         struct buffer   *buf;
00095         dma_addr_t      addr;
00096 
00097         buf = buffer_alloc();
00098         if (buf == NULL)
00099                 return NULL;
00100 
00101         addr = dma_alloc(size);
00102         if (dma_addr_is_failed(addr)) {
00103                 buffer_free(buf);
00104                 return NULL;
00105         }
00106 
00107         buf->addr = addr;
00108         buf->len = size;
00109 
00110         return buf;
00111 }
00112 
00116 void buffer_dma_free(struct buffer *buf, size_t size)
00117 {
00118         dma_free(buf->addr, size);
00119         buffer_free(buf);
00120 }
00121 #endif /* CONFIG_DMAPOOL_GENERIC_POOLS */
00122 
00129 void buffer_pool_init(void)
00130 {
00131         mem_pool_init_physmem(&buffer_pool, &cpu_sram_pool,
00132                         CONFIG_NR_BUFFERS, sizeof(struct buffer), 2);
00133 }