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

     /*      $NetBSD: ixp425_mem.c,v 1.2 2005/12/11 12:16:51 christos Exp $  */
     
     /*
      * Copyright (c) 2003 Wasabi Systems, Inc.
      * All rights reserved.
      *
      * Written by Steve C. Woodford for Wasabi Systems, Inc.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed for the NetBSD Project by
     *      Wasabi Systems, Inc.
     * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     *    or promote products derived from this software without specific prior
     *    written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    
    #include <arm/xscale/ixp425/ixp425reg.h>
    #include <arm/xscale/ixp425/ixp425var.h>
    
    static uint32_t sdram_64bit[] = {
            0x00800000,     /* 8M:  One 2M x 32 chip */
            0x01000000,     /* 16M: Two 2M x 32 chips */
            0x01000000,     /* 16M: Two 4M x 16 chips */
            0x02000000,     /* 32M: Four 4M x 32 chips */
            0, 0, 0, 0
    };
    
    static uint32_t sdram_other[] = {
            0x02000000,     /*  32M: Two   8M x 16 chips */
            0x04000000,     /*  64M: Four  8M x 16 chips */
            0x04000000,     /*  64M: Two  16M x 16 chips */
            0x08000000,     /* 128M: Four 16M x 16 chips */
            0x08000000,     /* 128M: Two  32M x 16 chips */
            0x10000000,     /* 256M: Four 32M x 16 chips */
            0, 0
    };
    
    uint32_t
    ixp425_sdram_size(void)
    {
    #define MCU_REG_READ(x) (*(volatile uint32_t *)(IXP425_MCU_VBASE + (x)))
            uint32_t size, sdr_config;
    
            sdr_config = MCU_REG_READ(MCU_SDR_CONFIG);
    
            if (sdr_config & MCU_SDR_CONFIG_64MBIT)
                    size = sdram_64bit[MCU_SDR_CONFIG_MCONF(sdr_config)];
            else
                    size = sdram_other[MCU_SDR_CONFIG_MCONF(sdr_config)];
    
            if (size == 0) {
                    printf("** SDR_CONFIG returns unknown value, using 32M\n");
                    size = 32 * 1024 * 1024;
            }
    
            return (size);
    #undef MCU_REG_READ
    }
    
    uint32_t
    ixp435_ddram_size(void)
    {
    #define MCU_REG_READ(x) (*(volatile uint32_t *)(IXP425_MCU_VBASE + (x)))
            uint32_t sbr0;
    
            /*
             * Table 198, page 516 shows DDR-I/II SDRAM bank sizes
             * for SBR0 and SBR1.  The manual states both banks must
             * be programmed to be the same size.  We just assume
             * it's done right and calculate 2x for the memory size.
             */
            sbr0 = MCU_REG_READ(MCU_DDR_SBR0);
           return 2 * 16*(sbr0 & 0x7f) * 1024 * 1024;
   #undef MCU_REG_READ
   }

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