freebsd-skq/sys/mips/atheros/ar71xx_bus_space_reversed.c

/*-
 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
 * All rights reserved.
 *
 * 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 unmodified, 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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.
 */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>

#include <machine/bus.h>
#include <mips/atheros/ar71xx_bus_space_reversed.h>

static bs_r_1_proto(reversed);
static bs_r_2_proto(reversed);
static bs_w_1_proto(reversed);
static bs_w_2_proto(reversed);

/*
 * Bus space that handles offsets in word for 1/2 bytes read/write access.
 * Byte order of values is handled by device drivers itself. 
 */
static struct bus_space bus_space_reversed = {
	/* cookie */
	(void *) 0,

	/* mapping/unmapping */
	generic_bs_map,
	generic_bs_unmap,
	generic_bs_subregion,

	/* allocation/deallocation */
	NULL,
	NULL,

	/* barrier */
	generic_bs_barrier,

	/* read (single) */
	reversed_bs_r_1,
	reversed_bs_r_2,
	generic_bs_r_4,
	NULL,

	/* read multiple */
	generic_bs_rm_1,
	generic_bs_rm_2,
	generic_bs_rm_4,
	NULL,

	/* read region */
	generic_bs_rr_1,
	generic_bs_rr_2,
	generic_bs_rr_4,
	NULL,

	/* write (single) */
	reversed_bs_w_1,
	reversed_bs_w_2,
	generic_bs_w_4,
	NULL,

	/* write multiple */
	generic_bs_wm_1,
	generic_bs_wm_2,
	generic_bs_wm_4,
	NULL,

	/* write region */
	NULL,
	generic_bs_wr_2,
	generic_bs_wr_4,
	NULL,

	/* set multiple */
	NULL,
	NULL,
	NULL,
	NULL,

	/* set region */
	NULL,
	generic_bs_sr_2,
	generic_bs_sr_4,
	NULL,

	/* copy */
	NULL,
	generic_bs_c_2,
	NULL,
	NULL,

	/* read (single) stream */
	generic_bs_r_1,
	generic_bs_r_2,
	generic_bs_r_4,
	NULL,

	/* read multiple stream */
	generic_bs_rm_1,
	generic_bs_rm_2,
	generic_bs_rm_4,
	NULL,

	/* read region stream */
	generic_bs_rr_1,
	generic_bs_rr_2,
	generic_bs_rr_4,
	NULL,

	/* write (single) stream */
	generic_bs_w_1,
	generic_bs_w_2,
	generic_bs_w_4,
	NULL,

	/* write multiple stream */
	generic_bs_wm_1,
	generic_bs_wm_2,
	generic_bs_wm_4,
	NULL,

	/* write region stream */
	NULL,
	generic_bs_wr_2,
	generic_bs_wr_4,
	NULL,
};

bus_space_tag_t ar71xx_bus_space_reversed = &bus_space_reversed;

static uint8_t
reversed_bs_r_1(void *t, bus_space_handle_t h, bus_size_t o)
{

	return readb(h + (o &~ 3) + (3 - (o & 3)));
}

static void
reversed_bs_w_1(void *t, bus_space_handle_t h, bus_size_t o, u_int8_t v)
{

	writeb(h + (o &~ 3) + (3 - (o & 3)), v);
}

static uint16_t
reversed_bs_r_2(void *t, bus_space_handle_t h, bus_size_t o)
{

	return readw(h + (o &~ 3) + (2 - (o & 3)));
}

static void
reversed_bs_w_2(void *t, bus_space_handle_t h, bus_size_t o, uint16_t v)
{

	writew(h + (o &~ 3) + (2 - (o & 3)), v);
}