sys/arch/arm/xscale/ixp425_mem.c

   1 /*      $NetBSD: ixp425_mem.c,v 1.1.4.3 2004/09/21 13:13:42 skrll 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 __KERNEL_RCSID(0, "$NetBSD: ixp425_mem.c,v 1.1.4.3 2004/09/21 13:13:42 skrll Exp $");
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43
  44 #include <arm/xscale/ixp425reg.h>
  45 #include <arm/xscale/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 }