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/* $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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