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("$FreeBSD$");
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: Two 4M x 16 chips */
51 0x02000000, /* 32M: Four 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 uint32_t
ixp425_sdram_size(void)66 ixp425_sdram_size(void)
67 {
68 #define MCU_REG_READ(x) (*(volatile uint32_t *)(IXP425_MCU_VBASE + (x)))
69 uint32_t size, sdr_config;
70
71 sdr_config = MCU_REG_READ(MCU_SDR_CONFIG);
72
73 if (sdr_config & MCU_SDR_CONFIG_64MBIT)
74 size = sdram_64bit[MCU_SDR_CONFIG_MCONF(sdr_config)];
75 else
76 size = sdram_other[MCU_SDR_CONFIG_MCONF(sdr_config)];
77
78 if (size == 0) {
79 printf("** SDR_CONFIG returns unknown value, using 32M\n");
80 size = 32 * 1024 * 1024;
81 }
82
83 return (size);
84 #undef MCU_REG_READ
85 }
86
87 uint32_t
ixp435_ddram_size(void)88 ixp435_ddram_size(void)
89 {
90 #define MCU_REG_READ(x) (*(volatile uint32_t *)(IXP425_MCU_VBASE + (x)))
91 uint32_t sbr0;
92
93 /*
94 * Table 198, page 516 shows DDR-I/II SDRAM bank sizes
95 * for SBR0 and SBR1. The manual states both banks must
96 * be programmed to be the same size. We just assume
97 * it's done right and calculate 2x for the memory size.
98 */
99 sbr0 = MCU_REG_READ(MCU_DDR_SBR0);
100 return 2 * 16*(sbr0 & 0x7f) * 1024 * 1024;
101 #undef MCU_REG_READ
102 }
103