arch/avr32/include/asm/arch-at32ap700x/addrspace.h

   1 /*
   2  * Copyright (C) 2006 Atmel Corporation
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22 #ifndef __ASM_AVR32_ADDRSPACE_H
  23 #define __ASM_AVR32_ADDRSPACE_H
  24
  25 #include <asm/types.h>
  26
  27 /* Memory segments when segmentation is enabled */
  28 #define P0SEG           0x00000000
  29 #define P1SEG           0x80000000
  30 #define P2SEG           0xa0000000
  31 #define P3SEG           0xc0000000
  32 #define P4SEG           0xe0000000
  33
  34 /* Returns the privileged segment base of a given address */
  35 #define PXSEG(a)        (((unsigned long)(a)) & 0xe0000000)
  36
  37 /* Returns the physical address of a PnSEG (n=1,2) address */
  38 #define PHYSADDR(a)     (((unsigned long)(a)) & 0x1fffffff)
  39
  40 /*
  41  * Map an address to a certain privileged segment
  42  */
  43 #define P1SEGADDR(a) ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P1SEG))
  44 #define P2SEGADDR(a) ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P2SEG))
  45 #define P3SEGADDR(a) ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P3SEG))
  46 #define P4SEGADDR(a) ((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P4SEG))
  47
  48 /* virt_to_phys will only work when address is in P1 or P2 */
  49 static inline unsigned long virt_to_phys(volatile void *address)
  50 {
  51         return PHYSADDR(address);
  52 }
  53
  54 static inline void * phys_to_virt(unsigned long address)
  55 {
  56         return (void *)P1SEGADDR(address);
  57 }
  58
  59 #define cached(addr) ((void *)P1SEGADDR(addr))
  60 #define uncached(addr) ((void *)P2SEGADDR(addr))
  61
  62 /*
  63  * Given a physical address and a length, return a virtual address
  64  * that can be used to access the memory range with the caching
  65  * properties specified by "flags".
  66  *
  67  * This implementation works for memory below 512MiB (flash, etc.) as
  68  * well as above 3.5GiB (internal peripherals.)
  69  */
  70 #define MAP_NOCACHE     (0)
  71 #define MAP_WRCOMBINE   (1 << 7)
  72 #define MAP_WRBACK      (MAP_WRCOMBINE | (1 << 9))
  73 #define MAP_WRTHROUGH   (MAP_WRBACK | (1 << 0))
  74
  75 static inline void *
  76 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
  77 {
  78         if (flags == MAP_WRBACK)
  79                 return (void *)P1SEGADDR(paddr);
  80         else
  81                 return (void *)P2SEGADDR(paddr);
  82 }
  83
  84 #endif /* __ASM_AVR32_ADDRSPACE_H */