The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/ixp425/ixp425_mem.c

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    1 /*      $NetBSD: ixp425_mem.c,v 1.2 2005/12/11 12:16:51 christos 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 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD: releng/6.3/sys/arm/xscale/ixp425/ixp425_mem.c 167038 2007-02-26 23:13:09Z cognet $");
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 
   44 #include <arm/xscale/ixp425/ixp425reg.h>
   45 #include <arm/xscale/ixp425/ixp425var.h>
   46 
   47 static uint32_t sdram_64bit[] = {
   48         0x00800000,     /* 8M:  One 2M x 32 chip */
   49         0x01000000,     /* 16M: Two 2M x 32 chips */
   50         0x01000000,     /* 16M: One 4M x 32 chip */
   51         0x02000000,     /* 32M: Two 4M x 32 chips */
   52         0, 0, 0, 0
   53 };
   54 
   55 static uint32_t sdram_other[] = {
   56         0x02000000,     /*  32M: Two   8M x 16 chips */
   57         0x04000000,     /*  64M: Four  8M x 16 chips */
   58         0x04000000,     /*  64M: Two  16M x 16 chips */
   59         0x08000000,     /* 128M: Four 16M x 16 chips */
   60         0x08000000,     /* 128M: Two  32M x 16 chips */
   61         0x10000000,     /* 256M: Four 32M x 16 chips */
   62         0, 0
   63 };
   64 
   65 #define MCU_REG_READ(x) (*(volatile uint32_t *)(IXP425_MCU_VBASE + (x)))
   66 
   67 uint32_t
   68 ixp425_sdram_size(void)
   69 {
   70         uint32_t size, sdr_config;
   71 
   72         sdr_config = MCU_REG_READ(MCU_SDR_CONFIG);
   73 
   74         if (sdr_config & MCU_SDR_CONFIG_64MBIT)
   75                 size = sdram_64bit[MCU_SDR_CONFIG_MCONF(sdr_config)];
   76         else
   77                 size = sdram_other[MCU_SDR_CONFIG_MCONF(sdr_config)];
   78 
   79         if (size == 0) {
   80                 printf("** SDR_CONFIG retuns unknown value, using 32M\n");
   81                 size = 32 * 1024 * 1024;
   82         }
   83 
   84         return (size);
   85 }

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