The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/i8134x/i81342_mcu.c

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    1 /*-
    2  * Copyright (c) 2006 Olivier Houchard
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   16  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR
   18  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   19  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   20  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   21  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   22  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   23  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   24  * POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/module.h>
   35 
   36 #include <machine/bus.h>
   37 #include <arm/xscale/i8134x/i81342reg.h>
   38 #include <arm/xscale/i8134x/i81342var.h>
   39 
   40 void
   41 i81342_sdram_bounds(bus_space_tag_t bt, bus_space_handle_t bh, 
   42     vm_paddr_t *start, vm_size_t *size)
   43 {
   44         uint32_t reg;
   45         int bank_nb;
   46 
   47         reg = bus_space_read_4(bt, bh, SMC_SDBR);
   48         *start = (reg & SMC_SDBR_BASEADDR_MASK);
   49         reg = bus_space_read_4(bt, bh, SMC_SBSR);
   50         if (reg & SMC_SBSR_BANK_NB)
   51                 bank_nb = 1;
   52         else
   53                 bank_nb = 2;
   54         
   55         *size = (reg & SMC_SBSR_BANK_SZ_MASK) * bank_nb;
   56 }

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