include/asm-avr32/setup.h

   1 /*
   2  * Copyright (C) 2004-2006 Atmel Corporation
   3  *
   4  * Based on linux/include/asm-arm/setup.h
   5  *   Copyright (C) 1997-1999 Russel King
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #ifndef __ASM_AVR32_SETUP_H__
  12 #define __ASM_AVR32_SETUP_H__
  13
  14 #define COMMAND_LINE_SIZE 256
  15
  16 /* Magic number indicating that a tag table is present */
  17 #define ATAG_MAGIC      0xa2a25441
  18
  19 #ifndef __ASSEMBLY__
  20
  21 /*
  22  * Generic memory range, used by several tags.
  23  *
  24  *   addr is always physical.
  25  *   size is measured in bytes.
  26  *   next is for use by the OS, e.g. for grouping regions into
  27  *        linked lists.
  28  */
  29 struct tag_mem_range {
  30         u32                     addr;
  31         u32                     size;
  32         struct tag_mem_range *  next;
  33 };
  34
  35 /* The list ends with an ATAG_NONE node. */
  36 #define ATAG_NONE       0x00000000
  37
  38 struct tag_header {
  39         u32 size;
  40         u32 tag;
  41 };
  42
  43 /* The list must start with an ATAG_CORE node */
  44 #define ATAG_CORE       0x54410001
  45
  46 struct tag_core {
  47         u32 flags;
  48         u32 pagesize;
  49         u32 rootdev;
  50 };
  51
  52 /* it is allowed to have multiple ATAG_MEM nodes */
  53 #define ATAG_MEM        0x54410002
  54 /* ATAG_MEM uses tag_mem_range */
  55
  56 /* command line: \0 terminated string */
  57 #define ATAG_CMDLINE    0x54410003
  58
  59 struct tag_cmdline {
  60         char    cmdline[1];     /* this is the minimum size */
  61 };
  62
  63 /* Ramdisk image (may be compressed) */
  64 #define ATAG_RDIMG      0x54410004
  65 /* ATAG_RDIMG uses tag_mem_range */
  66
  67 /* Information about various clocks present in the system */
  68 #define ATAG_CLOCK      0x54410005
  69
  70 struct tag_clock {
  71         u32     clock_id;       /* Which clock are we talking about? */
  72         u32     clock_flags;    /* Special features */
  73         u64     clock_hz;       /* Clock speed in Hz */
  74 };
  75
  76 /* The clock types we know about */
  77 #define CLOCK_BOOTCPU   0
  78
  79 /* Memory reserved for the system (e.g. the bootloader) */
  80 #define ATAG_RSVD_MEM   0x54410006
  81 /* ATAG_RSVD_MEM uses tag_mem_range */
  82
  83 /* Ethernet information */
  84
  85 #define ATAG_ETHERNET   0x54410007
  86
  87 struct tag_ethernet {
  88         u8      mac_index;
  89         u8      mii_phy_addr;
  90         u8      hw_address[6];
  91 };
  92
  93 #define ETH_INVALID_PHY 0xff
  94
  95 struct tag {
  96         struct tag_header hdr;
  97         union {
  98                 struct tag_core core;
  99                 struct tag_mem_range mem_range;
 100                 struct tag_cmdline cmdline;
 101                 struct tag_clock clock;
 102                 struct tag_ethernet ethernet;
 103         } u;
 104 };
 105
 106 struct tagtable {
 107         u32     tag;
 108         int     (*parse)(struct tag *);
 109 };
 110
 111 #define __tag __attribute_used__ __attribute__((__section__(".taglist")))
 112 #define __tagtable(tag, fn)                                             \
 113         static struct tagtable __tagtable_##fn __tag = { tag, fn }
 114
 115 #define tag_member_present(tag,member)                                  \
 116         ((unsigned long)(&((struct tag *)0L)->member + 1)               \
 117          <= (tag)->hdr.size * 4)
 118
 119 #define tag_next(t)     ((struct tag *)((u32 *)(t) + (t)->hdr.size))
 120 #define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
 121
 122 #define for_each_tag(t,base)                                            \
 123         for (t = base; t->hdr.size; t = tag_next(t))
 124
 125 extern struct tag_mem_range *mem_phys;
 126 extern struct tag_mem_range *mem_reserved;
 127 extern struct tag_mem_range *mem_ramdisk;
 128
 129 extern struct tag *bootloader_tags;
 130
 131 extern void setup_bootmem(void);
 132 extern void setup_processor(void);
 133 extern void board_setup_fbmem(unsigned long fbmem_start,
 134                               unsigned long fbmem_size);
 135
 136 /* Chip-specific hook to enable the use of SDRAM */
 137 void chip_enable_sdram(void);
 138
 139 #endif /* !__ASSEMBLY__ */
 140
 141 #endif /* __ASM_AVR32_SETUP_H__ */