sys/arch/mips/atheros/ar5315_board.c

   1 /* $NetBSD: ar5315_board.c,v 1.1 2006/09/26 06:37:32 gdamore Exp $ */
   2
   3 /*
   4  * Copyright (c) 2006 Urbana-Champaign Independent Media Center.
   5  * Copyright (c) 2006 Garrett D'Amore.
   6  * All rights reserved.
   7  *
   8  * Portions of this code were written by Garrett D'Amore for the
   9  * Champaign-Urbana Community Wireless Network Project.
  10  *
  11  * Redistribution and use in source and binary forms, with or
  12  * without modification, are permitted provided that the following
  13  * conditions are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above
  17  *    copyright notice, this list of conditions and the following
  18  *    disclaimer in the documentation and/or other materials provided
  19  *    with the distribution.
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgements:
  22  *      This product includes software developed by the Urbana-Champaign
  23  *      Independent Media Center.
  24  *      This product includes software developed by Garrett D'Amore.
  25  * 4. Urbana-Champaign Independent Media Center's name and Garrett
  26  *    D'Amore's name may not be used to endorse or promote products
  27  *    derived from this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
  30  * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
  31  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  32  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
  34  * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
  35  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  36  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  37  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  38  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  40  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  41  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  42  */
  43
  44 /*
  45  * This file provides code to locate board-specific configuration and radio
  46  * information data in flash for the AR5315.
  47  */
  48 #include <sys/cdefs.h>
  49 __KERNEL_RCSID(0, "$NetBSD: ar5315_board.c,v 1.1 2006/09/26 06:37:32 gdamore Exp $");
  50
  51 #include "opt_ddb.h"
  52 #include "opt_kgdb.h"
  53
  54 #include "opt_memsize.h"
  55 #include <sys/param.h>
  56 #include <sys/systm.h>
  57 #include <sys/kernel.h>
  58 #include <sys/buf.h>
  59
  60 #include <dev/cons.h>
  61
  62 #include <mips/cache.h>
  63 #include <mips/locore.h>
  64 #include <mips/cpuregs.h>
  65
  66 #include <net/if.h>
  67 #include <net/if_ether.h>
  68
  69 #include <ah_soc.h>     /* XXX really doesn't belong in hal */
  70
  71 #include <mips/atheros/include/ar5315reg.h>
  72 #include <mips/atheros/include/ar531xvar.h>
  73 #include <mips/atheros/include/arbusvar.h>
  74
  75 #include <machine/locore.h>
  76 #include "com.h"
  77
  78 /*
  79  * Locate the Board Configuration data using heuristics.
  80  * Search backward from the (aliased) end of flash looking
  81  * for the signature string that marks the start of the data.
  82  * We search at most 500KB.
  83  */
  84 const struct ar531x_boarddata *
  85 ar531x_board_info(void)
  86 {
  87         static const struct ar531x_boarddata *board = NULL;
  88         const uint8_t *ptr, *end;
  89
  90         if (board == NULL) {
  91
  92                 /* search backward in the flash looking for the signature */
  93                 ptr = (const uint8_t *) MIPS_PHYS_TO_KSEG1(AR5315_CONFIG_END
  94                     - 0x1000);
  95                 end = (const uint8_t *)AR5315_CONFIG_BASE;
  96                 /* XXX validate end */
  97                 for (; ptr > end; ptr -= 0x1000)
  98                         if (*(const uint32_t *)ptr == AR531X_BD_MAGIC) {
  99                                 board = (const struct ar531x_boarddata *) ptr;
 100                                 break;
 101                         }
 102         }
 103         return board;
 104 }
 105
 106 /*
 107  * Locate the radio configuration data; it is located relative to the
 108  * board configuration data.
 109  */
 110 const void *
 111 ar531x_radio_info(void)
 112 {
 113         static const void *radio = NULL;
 114         const struct ar531x_boarddata *board;
 115         const uint8_t *baddr, *ptr, *end;
 116
 117         if (radio)
 118                 goto done;
 119
 120         board = ar531x_board_info();
 121         if (board == NULL)
 122                 return NULL;
 123         baddr = (const uint8_t *) board;
 124         end = (const uint8_t *)MIPS_PHYS_TO_KSEG1(AR5315_RADIO_END);
 125
 126         for (ptr = baddr + 0x1000; ptr < end; ptr += 0x1000)
 127                 if (*(const uint32_t *)ptr != 0xffffffffU) {
 128                         radio = ptr;
 129                         goto done;
 130                 }
 131
 132         /* AR2316 moves radio data */
 133         for (ptr = baddr + 0xf8; ptr < end; ptr += 0x1000)
 134                 if (*(const uint32_t *)ptr != 0xffffffffU) {
 135                         radio = ptr;
 136                         goto done;
 137                 }
 138
 139 done:
 140         return radio;
 141 }
 142
 143 /*
 144  * Locate board and radio configuration data in flash.
 145  */
 146 int
 147 ar531x_board_config(struct ar531x_config *config)
 148 {
 149
 150         config->board = ar531x_board_info();
 151         if (config->board == NULL)
 152                 return ENOENT;
 153
 154         config->radio = ar531x_radio_info();
 155         if (config->radio == NULL)
 156                 return ENOENT;          /* XXX distinct code */
 157
 158         return 0;
 159 }