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i80312_mem.c revision 1.2 
      1 /*	$NetBSD: i80312_mem.c,v 1.2 2001/12/18 02:52:00 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe 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 /*
     39  * Intel i80312 Companion I/O memory controller support.
     40  */
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 
     45 #include <machine/bus.h>
     46 
     47 #include <arm/xscale/i80312reg.h>
     48 #include <arm/xscale/i80312var.h>
     49 
     50 /*
     51  * i80312_sdram_bounds:
     52  *
     53  *	Retrieve the start and size of SDRAM.
     54  */
     55 void
     56 i80312_sdram_bounds(bus_space_tag_t st, bus_space_handle_t sh,
     57     paddr_t *start, psize_t *size)
     58 {
     59 	uint32_t sdbr, sbr0, sbr1;
     60 	uint32_t bank0, bank1;
     61 
     62 	sdbr = bus_space_read_4(st, sh, I80312_MEM_SB);
     63 	sbr0 = bus_space_read_4(st, sh, I80312_MEM_SB0);
     64 	sbr1 = bus_space_read_4(st, sh, I80312_MEM_SB1);
     65 
     66 #ifdef VERBOSE_INIT_ARM
     67 	printf("i80312: SBDR = 0x%08x SBR0 = 0x%08x SBR1 = 0x%08x\n",
     68 	    sdbr, sbr0, sbr1);
     69 #endif
     70 
     71 	*start = sdbr;
     72 
     73 	sdbr = (sdbr >> 25) & 0xf;
     74 
     75 	sbr0 = ((sbr0 >> 3) & 0x1f) - sdbr;
     76 	sbr1 = ((sbr1 >> 3) & 0x1f) - sbr0;
     77 
     78 	bank0 = sbr0 << 25;
     79 	bank1 = sbr1 << 25;
     80 
     81 #ifdef VERBOSE_INIT_ARM
     82 	printf("i80312: BANK0 = 0x%08x BANK1 = 0x%08x\n", bank0, bank1);
     83 #endif
     84 
     85 	*size = bank0 + bank1;
     86 }
     87