sys/arch/arm/xscale/i80312_mem.c

   1 /*      $NetBSD: i80312_mem.c,v 1.2.20.3 2004/09/21 13:13:42 skrll 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/cdefs.h>
  43 __KERNEL_RCSID(0, "$NetBSD: i80312_mem.c,v 1.2.20.3 2004/09/21 13:13:42 skrll Exp $");
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47
  48 #include <machine/bus.h>
  49
  50 #include <arm/xscale/i80312reg.h>
  51 #include <arm/xscale/i80312var.h>
  52
  53 /*
  54  * i80312_sdram_bounds:
  55  *
  56  *      Retrieve the start and size of SDRAM.
  57  */
  58 void
  59 i80312_sdram_bounds(bus_space_tag_t st, bus_space_handle_t sh,
  60     paddr_t *start, psize_t *size)
  61 {
  62         uint32_t sdbr, sbr0, sbr1;
  63         uint32_t bank0, bank1;
  64
  65         sdbr = bus_space_read_4(st, sh, I80312_MEM_SB);
  66         sbr0 = bus_space_read_4(st, sh, I80312_MEM_SB0);
  67         sbr1 = bus_space_read_4(st, sh, I80312_MEM_SB1);
  68
  69 #ifdef VERBOSE_INIT_ARM
  70         printf("i80312: SBDR = 0x%08x SBR0 = 0x%08x SBR1 = 0x%08x\n",
  71             sdbr, sbr0, sbr1);
  72 #endif
  73
  74         *start = sdbr;
  75
  76         sdbr = (sdbr >> 25) & 0xf;
  77
  78         sbr0 = ((sbr0 >> 3) & 0x1f) - sdbr;
  79         sbr1 = ((sbr1 >> 3) & 0x1f) - sbr0;
  80
  81         bank0 = sbr0 << 25;
  82         bank1 = sbr1 << 25;
  83
  84 #ifdef VERBOSE_INIT_ARM
  85         printf("i80312: BANK0 = 0x%08x BANK1 = 0x%08x\n", bank0, bank1);
  86 #endif
  87
  88         *size = bank0 + bank1;
  89 }