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 __KERNEL_RCSID(0, "$NetBSD: ixp425_mem.c,v 1.2 2005/12/11 12:16:51 christos 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 } 86