sys/arch/evbarm/stand/board/becc_mem.c

   1 /*      $NetBSD: becc_mem.c,v 1.2 2005/12/24 20:07:03 perry Exp $       */
   2
   3 /*
   4  * Copyright (c) 2002, 2003 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  * This file provides the mem_init() function for boards using the
  40  * ADI BECC companion chip.
  41  */
  42
  43 #include <sys/types.h>
  44 #include <lib/libsa/stand.h>
  45
  46 #include <arm/xscale/beccreg.h>
  47
  48 #include <dev/pci/pcireg.h>
  49
  50 #include "board.h"
  51
  52 #define BECC_PCICORE_READ(x)                                            \
  53         *((volatile uint32_t *)                                 \
  54           (BECC_PCI_CONF_BASE | (1U << BECC_IDSEL_BIT) | (x)))
  55
  56 #define BECC_PCICORE_WRITE(x, v)                                        \
  57         *((volatile uint32_t *)                                 \
  58           (BECC_PCI_CONF_BASE | (1U << BECC_IDSEL_BIT) | (x))) = (v)
  59
  60 #define BECC_SDRAM_BAR  (PCI_MAPREG_START + 0x08)
  61
  62 void
  63 mem_init(void)
  64 {
  65         uint32_t start, size, reg, save, heap;
  66
  67         start = BECC_SDRAM_BASE;
  68
  69         /*
  70          * BECC <= Rev7 can only address 64M through the inbound PCI
  71          * windows.  Limit memory to 64M on those revs.
  72          *
  73          * On >= Rev8, there is a BAR which covers all of SDRAM which
  74          * we can probe for the memory size.
  75          */
  76         reg = BECC_PCICORE_READ(PCI_CLASS_REG);
  77 #ifdef BECC_SUPPORT_V7
  78         if (PCI_REVISION(reg) <= BECC_REV_V7)
  79                 size = (64U * 1024 * 1024);
  80         else {
  81 #endif
  82                 save = BECC_PCICORE_READ(BECC_SDRAM_BAR);
  83                 BECC_PCICORE_WRITE(BECC_SDRAM_BAR, 0xffffffffU);
  84                 reg = BECC_PCICORE_READ(BECC_SDRAM_BAR);
  85                 BECC_PCICORE_WRITE(BECC_SDRAM_BAR, save);
  86                 save = BECC_PCICORE_READ(BECC_SDRAM_BAR);
  87
  88                 size = PCI_MAPREG_MEM_SIZE(reg);
  89 #ifdef BECC_SUPPORT_V7
  90         }
  91 #endif
  92
  93         heap = (start + size) - BOARD_HEAP_SIZE;
  94
  95         printf(">> RAM 0x%x - 0x%x, heap at 0x%x\n",
  96             start, (start + size) - 1, heap);
  97         setheap((void *)heap, (void *)(start + size - 1));
  98 }