/*	$NetBSD: external_io.c,v 1.2 2013/06/22 13:32:54 kiyohara Exp $	*/

/*
 * Copyright (c) 1997 Mark Brinicombe.
 * 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, 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 by Mark Brinicombe.
 * 4. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
 */

/*
 * bus_space I/O functions for external bus
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: external_io.c,v 1.2 2013/06/22 13:32:54 kiyohara Exp $");

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

/* Proto types for all the bus_space structure functions */

bs_protos(external);
bs_protos(bs_notimpl);
bs_protos(mainbus);

/* Declare the external bus space tag */
struct bus_space external_bs_tag = {
	/* cookie */
	(void *) 0,			/* Shift to apply to registers */

	/* mapping/unmapping */
	mainbus_bs_map,
	mainbus_bs_unmap,
	external_bs_subregion,

	/* allocation/deallocation */
	mainbus_bs_alloc,
	mainbus_bs_free,

	/* get kernel virtual address */
	0, /* there is no linear mapping */

	/* mmap bus space for userland */
	mainbus_bs_mmap,

	/* barrier */
	mainbus_bs_barrier,

	/* read (single) */
	external_bs_r_1,
	bs_notimpl_bs_r_2,
	external_bs_r_4,
	bs_notimpl_bs_r_8,

	/* read multiple */
	external_bs_rm_1,
   	external_bs_rm_2,
   	external_bs_rm_4,
	bs_notimpl_bs_rm_8,

	/* read region */
	external_bs_rr_1,
	external_bs_rr_2,
	bs_notimpl_bs_rr_4,
	bs_notimpl_bs_rr_8,

	/* write (single) */
	external_bs_w_1,
	bs_notimpl_bs_w_2,
	external_bs_w_4,
	bs_notimpl_bs_w_8,

	/* write multiple */
	external_bs_wm_1,
	external_bs_wm_2,
	external_bs_wm_4,
	bs_notimpl_bs_wm_8,

	/* write region */
	external_bs_wr_1,
	external_bs_wr_2,
	bs_notimpl_bs_wr_4,
	bs_notimpl_bs_wr_8,

	/* set multiple */
	bs_notimpl_bs_sm_1,
	bs_notimpl_bs_sm_2,
	bs_notimpl_bs_sm_4,
	bs_notimpl_bs_sm_8,

	/* set region */
	external_bs_sr_1,
	external_bs_sr_2,
	bs_notimpl_bs_sr_4,
	bs_notimpl_bs_sr_8,

	/* copy */
	bs_notimpl_bs_c_1,
	bs_notimpl_bs_c_2,
	bs_notimpl_bs_c_4,
	bs_notimpl_bs_c_8,
};

/* bus space functions */

int
external_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
		      bus_size_t size, bus_space_handle_t *nbshp)
{

	*nbshp = bsh + offset;
	return 0;
}

/* Rough-and-ready implementations from arm26 */
void
external_bs_rr_1(void *cookie, bus_space_handle_t bsh,
		 bus_size_t offset, uint8_t *datap, bus_size_t count)
{
	int i;

	for (i = 0; i < count; i++)
		datap[i] = external_bs_r_1(cookie, bsh, offset + i);
}

void
external_bs_rr_2(void *cookie, bus_space_handle_t bsh,
		 bus_size_t offset, uint16_t *datap, bus_size_t count)
{
	int i;

	for (i = 0; count - i > 1 && i < count; i += 2)
		*(uint32_t *)(&datap[i]) =
		    external_bs_r_4(cookie, bsh, offset + (i << 1));
	for (; i < count; i++)
		datap[i] =
		    external_bs_r_1(cookie, bsh, offset + (i << 1)) |
		    external_bs_r_1(cookie, bsh, offset + (i << 1) + 1);
}

void
external_bs_wr_1(void *cookie, bus_space_handle_t bsh,
		 bus_size_t offset, uint8_t const *datap, bus_size_t count)
{
	int i;

	for (i = 0; i < count; i++)
		external_bs_w_1(cookie, bsh, offset + i, datap[i]);
}

void
external_bs_wr_2(void *cookie, bus_space_handle_t bsh,
		 bus_size_t offset, uint16_t const *datap, bus_size_t count)
{
	int i;
	uint16_t v;

	for (i = 0; count - i > 1 && i < count; i += 2)
		external_bs_w_4(cookie, bsh, offset + (i << 1),
		    *(const uint32_t *)(&datap[i]));
	for (; i < count; i++) {
		v = datap[i];
		external_bs_w_1(cookie, bsh, offset + (i << 1), v & 0xff);
		external_bs_w_1(cookie, bsh, offset + (i << 1) + 1, v >> 8);
	}
}

void
external_bs_sr_1(void *cookie, bus_space_handle_t bsh,
		 bus_size_t offset, uint8_t value, bus_size_t count)
{
	int i;

	for (i = 0; i < count; i++)
		external_bs_w_1(cookie, bsh, offset + i, value);
}

void
external_bs_sr_2(void *cookie, bus_space_handle_t bsh,
		 bus_size_t offset, uint16_t value, bus_size_t count)
{
	int i;

	for (i = 0; count - i > 1 && i < count; i += 2)
		external_bs_w_4(cookie, bsh, offset + (i << 1),
		    value | (value << 16));
	for (; i < count; i++) {
		external_bs_w_1(cookie, bsh, offset + (i << 1), value & 0xff);
		external_bs_w_1(cookie, bsh, offset + (i << 1) + 1, value >> 8);
	}
}