sys/arch/mips/atheros/ar5312_board.c

   1 /* $Id: ar5312_board.c,v 1.2 2009/07/06 00:43:22 alc Exp $ */
   2 /*
   3  * Copyright (c) 2006 Urbana-Champaign Independent Media Center.
   4  * Copyright (c) 2006 Garrett D'Amore.
   5  * All rights reserved.
   6  *
   7  * This code was written by Garrett D'Amore for the Champaign-Urbana
   8  * Community Wireless Network Project.
   9  *
  10  * Redistribution and use in source and binary forms, with or
  11  * without modification, are permitted provided that the following
  12  * conditions are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above
  16  *    copyright notice, this list of conditions and the following
  17  *    disclaimer in the documentation and/or other materials provided
  18  *    with the distribution.
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgements:
  21  *      This product includes software developed by the Urbana-Champaign
  22  *      Independent Media Center.
  23  *      This product includes software developed by Garrett D'Amore.
  24  * 4. Urbana-Champaign Independent Media Center's name and Garrett
  25  *    D'Amore's name may not be used to endorse or promote products
  26  *    derived from this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
  29  * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
  30  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  31  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
  33  * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
  34  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  35  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  36  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  37  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  38  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  40  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  41  */
  42 #include <sys/cdefs.h>
  43 __KERNEL_RCSID(0, "$NetBSD: ar5312_board.c,v 1.1 2006/09/26 06:37:32 gdamore Exp $");
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/device.h>
  48
  49 #include <machine/bus.h>
  50 #include <mips/atheros/include/ar5312reg.h>
  51 #include <mips/atheros/include/ar531xvar.h>
  52
  53 #include <ah_soc.h>
  54
  55 extern const char *ether_sprintf(const uint8_t *);
  56
  57 /*
  58  * Locate the Board Configuration data using heuristics.
  59  * Search backward from the (aliased) end of flash looking
  60  * for the signature string that marks the start of the data.
  61  * We search at most 500KB.
  62  */
  63 const struct ar531x_boarddata *
  64 ar531x_board_info(void)
  65 {
  66         static const struct ar531x_boarddata *board = NULL;
  67         const uint8_t *ptr, *end;
  68         uint32_t fctl;
  69
  70         if (board == NULL) {
  71                 /* configure flash bank 0 */
  72                 fctl = REGVAL(AR5312_FLASHCTL_BASE + AR5312_FLASHCTL_0) &
  73                     AR5312_FLASHCTL_MW_MASK;
  74
  75                 fctl |=
  76                     AR5312_FLASHCTL_E |
  77                     AR5312_FLASHCTL_RBLE |
  78                     AR5312_FLASHCTL_AC_8M |
  79                     (1 << AR5312_FLASHCTL_IDCY_SHIFT) |
  80                     (7 << AR5312_FLASHCTL_WST1_SHIFT) |
  81                     (7 << AR5312_FLASHCTL_WST2_SHIFT);
  82
  83                 REGVAL(AR5312_FLASHCTL_BASE + AR5312_FLASHCTL_0) = fctl;
  84
  85                 REGVAL(AR5312_FLASHCTL_BASE + AR5312_FLASHCTL_1) &=
  86                     ~(AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC_MASK);
  87
  88                 REGVAL(AR5312_FLASHCTL_BASE + AR5312_FLASHCTL_2) &=
  89                     ~(AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC_MASK);
  90
  91                 /* search backward in the flash looking for the signature */
  92                 ptr = (const uint8_t *) MIPS_PHYS_TO_KSEG1(AR5312_FLASH_END - 0x1000);
  93                 end = ptr - (500 * 1024);       /* NB: max 500KB window */
  94                 /* XXX validate end */
  95                 for (; ptr > end; ptr -= 0x1000)
  96                         if (*(const uint32_t *)ptr == AR531X_BD_MAGIC) {
  97                                 board = (const struct ar531x_boarddata *) ptr;
  98                                 break;
  99                         }
 100         }
 101         return board;
 102 }
 103
 104 /*
 105  * Locate the radio configuration data; it is located relative
 106  * to the board configuration data.
 107  */
 108 const void *
 109 ar531x_radio_info(void)
 110 {
 111         static const void *radio = NULL;
 112         const struct ar531x_boarddata *board;
 113         const uint8_t *baddr, *ptr, *end;
 114
 115         if (radio == NULL) {
 116                 board = ar531x_board_info();
 117                 if (board == NULL)
 118                         return NULL;
 119                 baddr = (const uint8_t *) board;
 120                 ptr = baddr + 0x1000;
 121                 end = (const uint8_t *)
 122                     MIPS_PHYS_TO_KSEG1(AR5312_FLASH_END-0x1000);
 123         again:
 124                 for (; ptr < end; ptr += 0x1000)
 125                         if (*(const uint32_t *)ptr != 0xffffffff) {
 126                                 radio = ptr;
 127                                 goto done;
 128                         }
 129                 /* sort of an Algol-style for loop ... */
 130                 if (end == (uint8_t *) MIPS_PHYS_TO_KSEG1(AR5312_FLASH_END)) {
 131                         /* NB: AR2316 has radio data in a different location */
 132                         ptr = baddr + 0xf8;
 133                         end = (const uint8_t *)
 134                             MIPS_PHYS_TO_KSEG1(AR5312_FLASH_END-0x1000 + 0xf8);
 135                         goto again;
 136                 }
 137         }
 138 done:
 139         return radio;
 140 }
 141
 142 /*
 143  * Locate board and radio configuration data in flash.
 144  */
 145 int
 146 ar531x_board_config(struct ar531x_config *config)
 147 {
 148
 149         config->board = ar531x_board_info();
 150         if (config->board == NULL)
 151                 return ENOENT;
 152         config->radio = ar531x_radio_info();
 153         if (config->radio == NULL)
 154                 return ENOENT;          /* XXX distinct code */
 155         return 0;
 156 }