1/*	$NetBSD: ixp425_mem.c,v 1.3 2023/06/24 05:43:25 msaitoh 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 1.3 2023/06/24 05:43:25 msaitoh 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
47static 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
55static 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
67uint32_t
68ixp425_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 returns unknown value, using 32M\n");
81		size = 32 * 1024 * 1024;
82	}
83
84	return (size);
85}
86