xref: /openbmc/linux/include/linux/fsl/bestcomm/sram.h (revision 9a322993)
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 
bcom_sram_va2pa(void * va)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 
bcom_sram_pa2va(phys_addr_t pa)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 
55