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      1 /*	$NetBSD: ixp425_mem.c,v 1.1 2020/02/12 06:57:35 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2003 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Steve C. Woodford for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * This file provides the mem_init() function for boards using the
     40  * Intel IXP425 Network Processor.
     41  */
     42 
     43 #include <sys/types.h>
     44 #include <lib/libsa/stand.h>
     45 
     46 #include <arm/xscale/ixp425reg.h>
     47 
     48 #include "board.h"
     49 
     50 #define	MCU_REG_READ(x)	(*(volatile uint32_t *)(IXP425_MCU_HWBASE + (x)))
     51 
     52 static const uint32_t sdram_64bit[] = {
     53 	0x00800000,	/* 8M:  One 2M x 32 chip */
     54 	0x01000000,	/* 16M: Two 2M x 32 chips */
     55 	0x01000000,	/* 16M: One 4M x 32 chip */
     56 	0x02000000,	/* 32M: Two 4M x 32 chips */
     57 	0, 0, 0, 0
     58 };
     59 
     60 static const uint32_t sdram_other[] = {
     61 	0x02000000,	/*  32M: Two   8M x 16 chips */
     62 	0x04000000,	/*  64M: Four  8M x 16 chips */
     63 	0x04000000,	/*  64M: Two  16M x 16 chips */
     64 	0x08000000,	/* 128M: Four 16M x 16 chips */
     65 	0x08000000,	/* 128M: Two  32M x 16 chips */
     66 	0x10000000,	/* 256M: Four 32M x 16 chips */
     67 	0, 0
     68 };
     69 
     70 void
     71 mem_init(void)
     72 {
     73 	uint32_t sdr_config;
     74 	uint32_t start, size, heap;
     75 
     76 	sdr_config = MCU_REG_READ(MCU_SDR_CONFIG);
     77 
     78 	start = 0x00000000;		/* fixed SDRAM base address */
     79 
     80 	if (sdr_config & MCU_SDR_CONFIG_64MBIT)
     81 		size = sdram_64bit[MCU_SDR_CONFIG_MCONF(sdr_config)];
     82 	else
     83 		size = sdram_other[MCU_SDR_CONFIG_MCONF(sdr_config)];
     84 
     85 	if (size == 0) {
     86 		printf("** SDR_CONFIG returns unknown value, using 32M\n");
     87 		size = 32 * 1024 * 1024;
     88 	}
     89 
     90 	heap = (start + size) - BOARD_HEAP_SIZE;
     91 
     92 	printf(">> RAM 0x%x - 0x%x, heap at 0x%x\n",
     93 	    start, (start + size) - 1, heap);
     94 	setheap((void *)heap, (void *)(start + size - 1));
     95 }
     96