arch/mips/include/asm/mach-powertv/ioremap.h

   1 /*
   2  *      This program is free software; you can redistribute it and/or
   3  *      modify it under the terms of the GNU General Public License
   4  *      as published by the Free Software Foundation; either version
   5  *      2 of the License, or (at your option) any later version.
   6  *
   7  * Portions Copyright (C)  Cisco Systems, Inc.
   8  */
   9 #ifndef __ASM_MACH_POWERTV_IOREMAP_H
  10 #define __ASM_MACH_POWERTV_IOREMAP_H
  11
  12 #include <linux/types.h>
  13
  14 #define LOW_MEM_BOUNDARY_PHYS   0x20000000
  15 #define LOW_MEM_BOUNDARY_MASK   (~(LOW_MEM_BOUNDARY_PHYS - 1))
  16
  17 /*
  18  * The bus addresses are different than the physical addresses that
  19  * the processor sees by an offset. This offset varies by ASIC
  20  * version. Define a variable to hold the offset and some macros to
  21  * make the conversion simpler. */
  22 extern unsigned long phys_to_bus_offset;
  23
  24 #ifdef CONFIG_HIGHMEM
  25 #define MEM_GAP_PHYS            0x60000000
  26 /*
  27  * TODO: We will use the hard code for conversion between physical and
  28  * bus until the bootloader releases their device tree to us.
  29  */
  30 #define phys_to_bus(x) (((x) < LOW_MEM_BOUNDARY_PHYS) ? \
  31         ((x) + phys_to_bus_offset) : (x))
  32 #define bus_to_phys(x) (((x) < MEM_GAP_PHYS_ADDR) ? \
  33         ((x) - phys_to_bus_offset) : (x))
  34 #else
  35 #define phys_to_bus(x) ((x) + phys_to_bus_offset)
  36 #define bus_to_phys(x) ((x) - phys_to_bus_offset)
  37 #endif
  38
  39 /*
  40  * Determine whether the address we are given is for an ASIC device
  41  * Params:  addr    Address to check
  42  * Returns: Zero if the address is not for ASIC devices, non-zero
  43  *      if it is.
  44  */
  45 static inline int asic_is_device_addr(phys_t addr)
  46 {
  47         return !((phys_t)addr & (phys_t) LOW_MEM_BOUNDARY_MASK);
  48 }
  49
  50 /*
  51  * Determine whether the address we are given is external RAM mappable
  52  * into KSEG1.
  53  * Params:  addr    Address to check
  54  * Returns: Zero if the address is not for external RAM and
  55  */
  56 static inline int asic_is_lowmem_ram_addr(phys_t addr)
  57 {
  58         /*
  59          * The RAM always starts at the following address in the processor's
  60          * physical address space
  61          */
  62         static const phys_t phys_ram_base = 0x10000000;
  63         phys_t bus_ram_base;
  64
  65         bus_ram_base = phys_to_bus_offset + phys_ram_base;
  66
  67         return addr >= bus_ram_base &&
  68                 addr < (bus_ram_base + (LOW_MEM_BOUNDARY_PHYS - phys_ram_base));
  69 }
  70
  71 /*
  72  * Allow physical addresses to be fixed up to help peripherals located
  73  * outside the low 32-bit range -- generic pass-through version.
  74  */
  75 static inline phys_t fixup_bigphys_addr(phys_t phys_addr, phys_t size)
  76 {
  77         return phys_addr;
  78 }
  79
  80 static inline void __iomem *plat_ioremap(phys_t offset, unsigned long size,
  81         unsigned long flags)
  82 {
  83         return NULL;
  84 }
  85
  86 static inline int plat_iounmap(const volatile void __iomem *addr)
  87 {
  88         return 0;
  89 }
  90 #endif /* __ASM_MACH_POWERTV_IOREMAP_H */