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/ixp425/ixp425_a4x_io.S

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    1 /*      $NetBSD: ixp425_a4x_io.S,v 1.2 2005/12/11 12:16:51 christos Exp $       */
    2 
    3 /*
    4  * Copyright 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 /*      
   39  * There are simple bus space functions for IO registers mapped at
   40  * 32-bit aligned positions.  offset is multiplied by 4.  
   41  *
   42  * Based loosely on pxa2x0_a2x_io.S
   43  */
   44 
   45 #include <machine/asm.h>
   46 __FBSDID("$FreeBSD: releng/7.4/sys/arm/xscale/ixp425/ixp425_a4x_io.S 164426 2006-11-19 23:55:23Z sam $");
   47 
   48 /*
   49  * bus_space I/O functions with offset*4
   50  */
   51 
   52 /*
   53  * Read single
   54  */
   55 ENTRY(a4x_bs_r_1)
   56         ldr     r0, [r1, r2, LSL #2]
   57         and     r0, r0, #0xff
   58         mov     pc, lr
   59 
   60 ENTRY(a4x_bs_r_2)
   61         ldr     r0, [r1, r2, LSL #2]
   62         mov     r1, #0xff
   63         orr     r1, r1, r1, lsl #8
   64         and     r0, r0, r1
   65         mov     pc, lr
   66 
   67 ENTRY(a4x_bs_r_4)
   68         ldr     r0, [r1, r2, LSL #2]
   69         mov     pc, lr
   70 
   71 /*
   72  * Write single
   73  */
   74 ENTRY(a4x_bs_w_1)
   75         and     r3, r3, #0xff
   76         str     r3, [r1, r2, LSL #2]
   77         mov     pc, lr
   78 
   79 ENTRY(a4x_bs_w_2)
   80         mov     r0, #0xff
   81         orr     r0, r0, r0, lsl #8
   82         and     r3, r3, r0
   83         str     r3, [r1, r2, LSL #2]
   84         mov     pc, lr
   85 
   86 ENTRY(a4x_bs_w_4)
   87         str     r3, [r1, r2, LSL #2]
   88         mov     pc, lr
   89 
   90 /*
   91  * Read multiple
   92  */
   93 ENTRY(a4x_bs_rm_1)
   94         add     r0, r1, r2, lsl #2
   95         ldr     r2, [sp, #0]
   96         mov     r1, r3
   97         teq     r2, #0
   98         moveq   pc, lr
   99 1:      ldr     r3, [r0]
  100         subs    r2, r2, #1
  101         strb    r3, [r1], #1
  102         bne     1b
  103         mov     pc, lr
  104 
  105 ENTRY(a4x_bs_rm_2)
  106         add     r0, r1, r2, lsl #2
  107         ldr     r2, [sp, #0]
  108         mov     r1, r3
  109         teq     r2, #0
  110         moveq   pc, lr
  111 1:      ldr     r3, [r0]
  112         subs    r2, r2, #1
  113         strh    r3, [r1], #2
  114         bne     1b
  115         mov     pc, lr
  116 
  117 /*
  118  * Write multiple
  119  */
  120 ENTRY(a4x_bs_wm_1)
  121         add     r0, r1, r2, lsl #2
  122         ldr     r2, [sp, #0]
  123         mov     r1, r3
  124         teq     r2, #0
  125         moveq   pc, lr
  126 1:      ldrb    r3, [r1], #1
  127         subs    r2, r2, #1
  128         str     r3, [r0]
  129         bne     1b
  130         mov     pc, lr
  131 
  132 ENTRY(a4x_bs_wm_2)
  133         add     r0, r1, r2, lsl #2
  134         ldr     r2, [sp, #0]
  135         mov     r1, r3
  136         teq     r2, #0
  137         moveq   pc, lr
  138 1:      ldrh    r3, [r1], #2
  139         subs    r2, r2, #1
  140         str     r3, [r0]
  141         bne     1b
  142         mov     pc, lr

Cache object: 04ab482653f4aacfe9f933e4efce4cb2


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