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      1 /*	$NetBSD: podulebus_io_asm.S,v 1.1 2001/10/05 22:27:58 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 podulebus
     39  */
     40 
     41 /*
     42  * read single
     43  */
     44 
     45 ENTRY(podulebus_bs_r_1)
     46 	mov	r2, r2, lsl r0
     47 	ldrb	r0, [r1, r2]
     48 	mov	pc, lr
     49 
     50 ENTRY(podulebus_bs_r_2)
     51 	mov	r2, r2, lsl r0
     52 	ldr	r0, [r1, r2]
     53 	bic	r0, r0, #0xff000000
     54 	bic	r0, r0, #0x00ff0000
     55 	mov	pc, lr
     56 
     57 ENTRY(podulebus_bs_r_4)
     58 	mov	r2, r2, lsl r0
     59 	ldr	r0, [r1, r2]
     60 	mov	pc, lr
     61 
     62 /*
     63  * write single
     64  */
     65 
     66 ENTRY(podulebus_bs_w_1)
     67 	mov	r2, r2, lsl r0
     68 	strb	r3, [r1, r2]
     69 	mov	pc, lr
     70 
     71 ENTRY(podulebus_bs_w_2)
     72 	mov	r3, r3, lsl #16
     73 	orr	r3, r3, r3, lsr #16
     74 	mov	r2, r2, lsl r0
     75 	str	r3, [r1, r2]
     76 	mov	pc, lr
     77 
     78 ENTRY(podulebus_bs_w_4)
     79 	mov	r2, r2, lsl r0
     80 	str	r3, [r1, r2]
     81 	mov	pc, lr
     82 
     83 /*
     84  * read multiple
     85  */
     86 
     87 ENTRY(podulebus_bs_rm_1)
     88 	add	r0, r1, r2, lsl r0
     89 	ldr	r2, [sp, #0]
     90 
     91 	/* Make sure that we have a positive length */
     92 	cmp	r2, #0x00000000
     93 	movle	pc, lr
     94 
     95 podulebus_rm_1_loop:
     96 	ldrb	r1, [r0]
     97 	strb	r1, [r3], #0x0001
     98 	subs	r2, r2, #0x00000001
     99 	bgt	podulebus_rm_1_loop
    100 
    101 	mov	pc, lr
    102 
    103 ENTRY(podulebus_bs_rm_2)
    104 	add	r0, r1, r2, lsl r0
    105 	mov	r1, r3
    106 	ldr	r2, [sp, #0]
    107 	b	_C_LABEL(insw)
    108 
    109 /*
    110  * write multiple
    111  */
    112 
    113 ENTRY(podulebus_bs_wm_1)
    114 	add	r0, r1, r2, lsl r0
    115 	ldr	r2, [sp, #0]
    116 
    117 	/* Make sure that we have a positive length */
    118 	cmp	r2, #0x00000000
    119 	movle	pc, lr
    120 
    121 podulebus_wm_1_loop:
    122 	ldrb	r1, [r3], #0x0001
    123 	strb	r1, [r0]
    124 	subs	r2, r2, #0x00000001
    125 	bgt	podulebus_wm_1_loop
    126 
    127 	mov	pc, lr
    128 
    129 ENTRY(podulebus_bs_wm_2)
    130 	add	r0, r1, r2, lsl r0
    131 	mov	r1, r3
    132 	ldr	r2, [sp, #0]
    133 	b	_C_LABEL(outsw)
    134