arch/arm/mach-davinci/sram.h

   1 /*
   2  * mach/sram.h - DaVinci simple SRAM allocator
   3  *
   4  * Copyright (C) 2009 David Brownell
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #ifndef __MACH_SRAM_H
  11 #define __MACH_SRAM_H
  12
  13 /* ARBITRARY:  SRAM allocations are multiples of this 2^N size */
  14 #define SRAM_GRANULARITY        512
  15
  16 /*
  17  * SRAM allocations return a CPU virtual address, or NULL on error.
  18  * If a DMA address is requested and the SRAM supports DMA, its
  19  * mapped address is also returned.
  20  *
  21  * Errors include SRAM memory not being available, and requesting
  22  * DMA mapped SRAM on systems which don't allow that.
  23  */
  24 extern void *sram_alloc(size_t len, dma_addr_t *dma);
  25 extern void sram_free(void *addr, size_t len);
  26
  27 /* Get the struct gen_pool * for use in platform data */
  28 extern struct gen_pool *sram_get_gen_pool(void);
  29
  30 #endif /* __MACH_SRAM_H */