arch/powerpc/sysdev/bestcomm/sram.h

   1 /*
   2  * Handling of a sram zone for bestcomm
   3  *
   4  *
   5  * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com>
   6  *
   7  * This file is licensed under the terms of the GNU General Public License
   8  * version 2. This program is licensed "as is" without any warranty of any
   9  * kind, whether express or implied.
  10  */
  11
  12 #ifndef __BESTCOMM_SRAM_H__
  13 #define __BESTCOMM_SRAM_H__
  14
  15 #include <asm/rheap.h>
  16 #include <asm/mmu.h>
  17 #include <linux/spinlock.h>
  18
  19
  20 /* Structure used internally */
  21         /* The internals are here for the inline functions
  22          * sake, certainly not for the user to mess with !
  23          */
  24 struct bcom_sram {
  25         phys_addr_t              base_phys;
  26         void                    *base_virt;
  27         unsigned int             size;
  28         rh_info_t               *rh;
  29         spinlock_t               lock;
  30 };
  31
  32 extern struct bcom_sram *bcom_sram;
  33
  34
  35 /* Public API */
  36 extern int  bcom_sram_init(struct device_node *sram_node, char *owner);
  37 extern void bcom_sram_cleanup(void);
  38
  39 extern void* bcom_sram_alloc(int size, int align, phys_addr_t *phys);
  40 extern void  bcom_sram_free(void *ptr);
  41
  42 static inline phys_addr_t bcom_sram_va2pa(void *va) {
  43         return bcom_sram->base_phys +
  44                 (unsigned long)(va - bcom_sram->base_virt);
  45 }
  46
  47 static inline void *bcom_sram_pa2va(phys_addr_t pa) {
  48         return bcom_sram->base_virt +
  49                 (unsigned long)(pa - bcom_sram->base_phys);
  50 }
  51
  52
  53 #endif  /* __BESTCOMM_SRAM_H__ */
  54