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mainbus_io_asm.S revision 1.2 
      1 /*	$NetBSD: mainbus_io_asm.S,v 1.2 2013/08/18 06:29:29 matt 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 	RET
     49 END(mainbus_bs_r_1)
     50 
     51 ENTRY(mainbus_bs_r_2)
     52 	ldr	r0, [r1, r2, lsl #2]
     53 	bic	r0, r0, #0xff000000
     54 	bic	r0, r0, #0x00ff0000
     55 	RET
     56 END(mainbus_bs_r_2)
     57 
     58 ENTRY(mainbus_bs_r_4)
     59 	ldr	r0, [r1, r2, lsl #2]
     60 	RET
     61 END(mainbus_bs_r_4)
     62 
     63 /*
     64  * write single
     65  */
     66 
     67 ENTRY(mainbus_bs_w_1)
     68 	strb	r3, [r1, r2, lsl #2]
     69 	RET
     70 END(mainbus_bs_w_1)
     71 
     72 ENTRY(mainbus_bs_w_2)
     73 	mov	r3, r3, lsl #16
     74 	orr	r3, r3, r3, lsr #16
     75 	str	r3, [r1, r2, lsl #2]
     76 	RET
     77 END(mainbus_bs_w_2)
     78 
     79 ENTRY(mainbus_bs_w_4)
     80 	str	r3, [r1, r2, lsl #2]
     81 	RET
     82 END(mainbus_bs_w_4)
     83 
     84 /*
     85  * read multiple
     86  */
     87 
     88 ENTRY(mainbus_bs_rm_2)
     89 	add	r0, r1, r2, lsl #2
     90 	mov	r1, r3
     91 	ldr	r2, [sp, #0]
     92 	b	_C_LABEL(insw16)
     93 END(mainbus_bs_rm_2)
     94 
     95 /*
     96  * write multiple
     97  */
     98 
     99 ENTRY(mainbus_bs_wm_1)
    100 	add	r0, r1, r2, lsl #2
    101 	ldr	r2, [sp, #0]
    102 
    103 	/* Make sure that we have a positive length */
    104 	cmp	r2, #0x00000000
    105 	RETc(le)
    106 
    107 .Lmainbus_wm_1_loop:
    108 	ldrb	r1, [r3], #0x0001
    109 	str	r1, [r0]
    110 	subs	r2, r2, #0x00000001
    111 	bgt	.Lmainbus_wm_1_loop
    112 
    113 	RET
    114 END(mainbus_bs_wm_1)
    115 
    116 ENTRY(mainbus_bs_wm_2)
    117 	add	r0, r1, r2, lsl #2
    118 	mov	r1, r3
    119 	ldr	r2, [sp, #0]
    120 	b	_C_LABEL(outsw16)
    121 END(mainbus_bs_wm_2)
    122