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mainbus_io_asm.S revision 1.1 
      1 /*	$NetBSD: mainbus_io_asm.S,v 1.1 2001/02/24 19:38:02 reinoud Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Mark Brinicombe.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by Mark Brinicombe.
     18  * 4. The name of the company nor the name of the author may be used to
     19  *    endorse or promote products derived from this software without specific
     20  *    prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     26  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     27  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     28  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <machine/asm.h>
     36 
     37 /*
     38  * bus_space I/O functions for mainbus
     39  */
     40 
     41 
     42 /*
     43  * read single
     44  */
     45 
     46 ENTRY(mainbus_bs_r_1)
     47 	ldrb	r0, [r1, r2, lsl #2]
     48 	mov	pc, lr
     49 
     50 ENTRY(mainbus_bs_r_2)
     51 	ldr	r0, [r1, r2, lsl #2]
     52 	bic	r0, r0, #0xff000000
     53 	bic	r0, r0, #0x00ff0000
     54 	mov	pc, lr
     55 
     56 ENTRY(mainbus_bs_r_4)
     57 	ldr	r0, [r1, r2, lsl #2]
     58 	mov	pc, lr
     59 
     60 /*
     61  * write single
     62  */
     63 
     64 ENTRY(mainbus_bs_w_1)
     65 	strb	r3, [r1, r2, lsl #2]
     66 	mov	pc, lr
     67 
     68 ENTRY(mainbus_bs_w_2)
     69 	mov	r3, r3, lsl #16
     70 	orr	r3, r3, r3, lsr #16
     71 	str	r3, [r1, r2, lsl #2]
     72 	mov	pc, lr
     73 
     74 ENTRY(mainbus_bs_w_4)
     75 	str	r3, [r1, r2, lsl #2]
     76 	mov	pc, lr
     77 
     78 /*
     79  * read multiple
     80  */
     81 
     82 ENTRY(mainbus_bs_rm_2)
     83 	add	r0, r1, r2, lsl #2
     84 	mov	r1, r3
     85 	ldr	r2, [sp, #0]
     86 	b	_C_LABEL(insw16)
     87 
     88 /*
     89  * write multiple
     90  */
     91 
     92 ENTRY(mainbus_bs_wm_1)
     93 	add	r0, r1, r2, lsl #2
     94 	ldr	r2, [sp, #0]
     95 
     96 	/* Make sure that we have a positive length */
     97 	cmp	r2, #0x00000000
     98 	movle	pc, lr
     99 
    100 mainbus_wm_1_loop:
    101 	ldrb	r1, [r3], #0x0001
    102 	str	r1, [r0]
    103 	subs	r2, r2, #0x00000001
    104 	bgt	mainbus_wm_1_loop
    105 
    106 	mov	pc, lr
    107 
    108 ENTRY(mainbus_bs_wm_2)
    109 	add	r0, r1, r2, lsl #2
    110 	mov	r1, r3
    111 	ldr	r2, [sp, #0]
    112 	b	_C_LABEL(outsw16)
    113