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      1 /* $NetBSD: ar5315_board.c,v 1.4 2011/07/10 06:24:18 matt 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 1.4 2011/07/10 06:24:18 matt 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/arbusvar.h>
     73 #include <mips/atheros/include/platform.h>
     74 
     75 #include <mips/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 static const struct ar531x_boarddata *
     85 ar5315_get_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 static const void *
    111 ar5315_get_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 = ar5315_get_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 const struct atheros_boardsw ar5315_boardsw = {
    144 	.absw_get_board_info = ar5315_get_board_info,
    145 	.absw_get_radio_info = ar5315_get_radio_info,
    146 };
    147