/*      $NetBSD: ixp425_a4x_io.S,v 1.2 2005/12/11 12:16:51 christos Exp $       */

/*
 * Copyright 2003 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Steve C. Woodford for Wasabi Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*      
 * There are simple bus space functions for IO registers mapped at
 * 32-bit aligned positions.  offset is multiplied by 4.  
 *
 * Based loosely on pxa2x0_a2x_io.S
 */

#include <machine/asm.h>

/*
 * bus_space I/O functions with offset*4
 */

/*
 * Read single
 */
ENTRY(a4x_bs_r_1)
        ldr     r0, [r1, r2, LSL #2]
        and     r0, r0, #0xff
        mov     pc, lr

ENTRY(a4x_bs_r_2)
        ldr     r0, [r1, r2, LSL #2]
        mov     r1, #0xff
        orr     r1, r1, r1, lsl #8
        and     r0, r0, r1
        mov     pc, lr

ENTRY(a4x_bs_r_4)
        ldr     r0, [r1, r2, LSL #2]
        mov     pc, lr

/*
 * Write single
 */
ENTRY(a4x_bs_w_1)
        and     r3, r3, #0xff
        str     r3, [r1, r2, LSL #2]
        mov     pc, lr

ENTRY(a4x_bs_w_2)
        mov     r0, #0xff
        orr     r0, r0, r0, lsl #8
        and     r3, r3, r0
        str     r3, [r1, r2, LSL #2]
        mov     pc, lr

ENTRY(a4x_bs_w_4)
        str     r3, [r1, r2, LSL #2]
        mov     pc, lr

/*
 * Read multiple
 */
ENTRY(a4x_bs_rm_1)
        add     r0, r1, r2, lsl #2
        ldr     r2, [sp, #0]
        mov     r1, r3
        teq     r2, #0
        moveq   pc, lr
1:      ldr     r3, [r0]
        subs    r2, r2, #1
        strb    r3, [r1], #1
        bne     1b
        mov     pc, lr

ENTRY(a4x_bs_rm_2)
        add     r0, r1, r2, lsl #2
        ldr     r2, [sp, #0]
        mov     r1, r3
        teq     r2, #0
        moveq   pc, lr
1:      ldr     r3, [r0]
        subs    r2, r2, #1
        strh    r3, [r1], #2
        bne     1b
        mov     pc, lr

/*
 * Write multiple
 */
ENTRY(a4x_bs_wm_1)
        add     r0, r1, r2, lsl #2
        ldr     r2, [sp, #0]
        mov     r1, r3
        teq     r2, #0
        moveq   pc, lr
1:      ldrb    r3, [r1], #1
        subs    r2, r2, #1
        str     r3, [r0]
        bne     1b
        mov     pc, lr

ENTRY(a4x_bs_wm_2)
        add     r0, r1, r2, lsl #2
        ldr     r2, [sp, #0]
        mov     r1, r3
        teq     r2, #0
        moveq   pc, lr
1:      ldrh    r3, [r1], #2
        subs    r2, r2, #1
        str     r3, [r0]
        bne     1b
        mov     pc, lr