LXR uboot/arch/openrisc/include/asm/io.h

   1/*
   2 * (C) Copyright 2011, Julius Baxter <julius@opencores.org>
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License as
   6 * published by the Free Software Foundation; either version 2 of
   7 * the License, or (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  17 * MA 02111-1307 USA
  18 */
  19
  20#ifndef __ASM_OPENRISC_IO_H
  21#define __ASM_OPENRISC_IO_H
  22
  23/*
  24 * Given a physical address and a length, return a virtual address
  25 * that can be used to access the memory range with the caching
  26 * properties specified by "flags".
  27 */
  28#define MAP_NOCACHE     (0)
  29#define MAP_WRCOMBINE   (0)
  30#define MAP_WRBACK      (0)
  31#define MAP_WRTHROUGH   (0)
  32
  33static inline void *
  34map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
  35{
  36        return (void *)paddr;
  37}
  38
  39/*
  40 * Take down a mapping set up by map_physmem().
  41 */
  42static inline void unmap_physmem(void *vaddr, unsigned long flags)
  43{
  44
  45}
  46
  47/*
  48 * Change virtual addresses to physical addresses
  49 */
  50static inline phys_addr_t virt_to_phys(void *vaddr)
  51{
  52        return (phys_addr_t)(vaddr);
  53}
  54
  55
  56/*
  57 * readX/writeX() are used to access memory mapped devices. On some
  58 * architectures the memory mapped IO stuff needs to be accessed
  59 * differently. On the openrisc architecture, we just read/write the
  60 * memory location directly.
  61 */
  62#define readb(addr) (*(volatile unsigned char *) (addr))
  63#define readw(addr) (*(volatile unsigned short *) (addr))
  64#define readl(addr) (*(volatile unsigned int *) (addr))
  65#define __raw_readb readb
  66#define __raw_readw readw
  67#define __raw_readl readl
  68
  69#define writeb(b, addr) ((*(volatile unsigned char *) (addr)) = (b))
  70#define writew(b, addr) ((*(volatile unsigned short *) (addr)) = (b))
  71#define writel(b, addr) ((*(volatile unsigned int *) (addr)) = (b))
  72#define __raw_writeb writeb
  73#define __raw_writew writew
  74#define __raw_writel writel
  75
  76#define memset_io(a, b, c)      memset((void *)(a), (b), (c))
  77#define memcpy_fromio(a, b, c)  memcpy((a), (void *)(b), (c))
  78#define memcpy_toio(a, b, c)    memcpy((void *)(a), (b), (c))
  79
  80/*
  81 * Again, OpenRISC does not require mem IO specific function.
  82 */
  83
  84
  85#define IO_BASE                 0x0
  86#define IO_SPACE_LIMIT          0xffffffff
  87
  88#define inb(port)               readb((port + IO_BASE))
  89#define outb(value, port)       writeb((value), (port + IO_BASE))
  90#define inb_p(port)             inb((port))
  91#define outb_p(value, port)     outb((value), (port))
  92
  93/*
  94 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  95 * access
  96 */
  97#define xlate_dev_mem_ptr(p)    __va(p)
  98
  99/*
 100 * Convert a virtual cached pointer to an uncached pointer
 101 */
 102#define xlate_dev_kmem_ptr(p)   p
 103
 104#define ioread8(addr)           readb(addr)
 105#define ioread16(addr)          readw(addr)
 106#define ioread32(addr)          readl(addr)
 107
 108#define iowrite8(v, addr)       writeb((v), (addr))
 109#define iowrite16(v, addr)      writew((v), (addr))
 110#define iowrite32(v, addr)      writel((v), (addr))
 111
 112#endif
 113