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      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 
     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 returns unknown value, using 32M\n");
     81 		size = 32 * 1024 * 1024;
     82 	}
     83 
     84 	return (size);
     85 }
     86