/*	$NetBSD: bus_subr.c,v 1.18 2013/09/07 15:56:11 tsutsui Exp $	*/

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Adam Glass and Gordon W. Ross.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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_xxx support functions, Sun3-specific part.
 * The common stuff is in autoconf.c
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bus_subr.c,v 1.18 2013/09/07 15:56:11 tsutsui Exp $");

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

#include <uvm/uvm_extern.h>

#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/mon.h>
#include <machine/pmap.h>
#include <machine/pte.h>

#include <sun3/sun3/control.h>
#include <sun3/sun3/machdep.h>
#include <sun3/sun3/vme.h>

label_t *nofault;

/* These are defined in pmap.c */
extern vaddr_t tmp_vpages[];
extern int tmp_vpages_inuse;

#define OBIO_MASK 0xFFffff

static const struct {
	int  type;
	long base;
	long mask;
} bus_info[BUS__NTYPES] = {
	{ PMAP_OBIO,  0, OBIO_MASK },
	{ PMAP_OBMEM, 0, ~0 },
	/* VME A16 */
	{ PMAP_VME16, VME16_BASE, VME16_MASK },
	{ PMAP_VME32, VME16_BASE, VME16_MASK },
	/* VME A24 */
	{ PMAP_VME16, VME24_BASE, VME24_MASK },
	{ PMAP_VME32, VME24_BASE, VME24_MASK },
	/* VME A32 */
	{ PMAP_VME16, VME32_BASE, VME32_MASK },
	{ PMAP_VME32, VME32_BASE, VME32_MASK },
};

/*
 * Create a temporary, one-page mapping for a device.
 * This is used by some device probe routines that
 * need to do peek/write/read tricks.
 */
void *
bus_tmapin(int bustype, int pa)
{
	vaddr_t pgva;
	int off, pte;

	if ((bustype < 0) || (bustype >= BUS__NTYPES))
		panic("bus_tmapin: bustype");

	off = pa & PGOFSET;
	pa -= off;

	pa &= bus_info[bustype].mask;
	pa |= bus_info[bustype].base;

	pte = PA_PGNUM(pa);
	pte |= (bus_info[bustype].type << PG_MOD_SHIFT);
	pte |= (PG_VALID | PG_WRITE | PG_SYSTEM | PG_NC);

	if (tmp_vpages_inuse)
		panic("bus_tmapin: tmp_vpages_inuse");
	tmp_vpages_inuse++;

	pgva = tmp_vpages[1];
	set_pte(pgva, pte);

	return ((void *)(pgva + off));
}

void
bus_tmapout(void *vp)
{
	vaddr_t pgva;

	pgva = m68k_trunc_page(vp);
	if (pgva != tmp_vpages[1])
		return;

	set_pte(pgva, PG_INVAL);
	--tmp_vpages_inuse;
}

/*
 * Make a permanent mapping for a device.
 */
void *
bus_mapin(int bustype, int pa, int sz)
{
	vaddr_t va;
	int off;

	if ((bustype < 0) || (bustype >= BUS__NTYPES))
		panic("bus_mapin: bustype");

	off = pa & PGOFSET;
	pa -= off;
	sz += off;
	sz = m68k_round_page(sz);

	/* Borrow PROM mappings if we can. */
	if (bustype == BUS_OBIO) {
		if (find_prom_map(pa, PMAP_OBIO, sz, &va) == 0)
			goto done;
	}

	pa &= bus_info[bustype].mask;
	pa |= bus_info[bustype].base;
	pa |= bus_info[bustype].type;
	pa |= PMAP_NC;	/* non-cached */

	/* Get some kernel virtual address space. */
	va = uvm_km_alloc(kernel_map, sz, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA);
	if (va == 0)
		panic("bus_mapin");

	/* Map it to the specified bus. */
	pmap_map(va, pa, pa + sz, VM_PROT_ALL);

done:
	return ((void*)(va + off));
}

void
bus_mapout(void *ptr, int sz)
{
	vaddr_t va;
	int off;

	va = (vaddr_t)ptr;

	/* If it was a PROM mapping, do NOT free it! */
	if ((va >= SUN3_MONSTART) && (va < SUN3_MONEND))
		return;

	off = va & PGOFSET;
	va -= off;
	sz += off;
	sz = m68k_round_page(sz);

	pmap_remove(pmap_kernel(), va, va + sz);
	pmap_update(pmap_kernel());
	uvm_km_free(kernel_map, va, sz, UVM_KMF_VAONLY);
}