/*	$OpenBSD: rbus_machdep.c,v 1.23 2008/07/07 23:41:58 brad Exp $ */
/*	$NetBSD: rbus_machdep.c,v 1.2 1999/10/15 06:43:06 haya Exp $	*/

/*
 * Copyright (c) 1999
 *     HAYAKAWA Koichi.  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 HAYAKAWA Koichi.
 * 4. The name of the author may not 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 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 "pcibios.h"

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

#include <uvm/uvm_extern.h>

#include <sys/device.h>

#include <machine/bus.h>
#include <dev/cardbus/rbus.h>

#include <dev/pci/pcivar.h>
#include <arch/i386/pci/pcibiosvar.h>

#ifndef RBUS_IO_START
#define RBUS_IO_START	0xa000
#endif
#ifndef RBUS_IO_SIZE
#define RBUS_IO_SIZE	0x1000
#endif

#ifndef RBUS_MIN_START
#define RBUS_MIN_START	0x40000000	/* 1 GB */
#endif
#ifndef RBUS_MEM_SIZE
#define RBUS_MEM_SIZE	0x00100000	
#endif

/*
 * Dynamically set the start address for rbus.  This must be called
 * before rbus is initialized.  The start address should be determined
 * by the amount of installed memory.  Generally 1 GB has been found
 * to be a good value, but it fails on some Thinkpads (e.g. 2645-4AU),
 * for which 0.5 GB is a good value.  It also fails on (at least)
 * Thinkpads with 2GB of RAM, for which 2 GB is a good value.
 *
 * Thus, a general strategy of setting rbus_min_start to the amount of
 * memory seems in order.  However, the actual amount of memory is
 * generally slightly more than the amount found, e.g. 1014MB vs 1024,
 * or 2046 vs 2048.
 */
bus_addr_t
rbus_min_start_hint(void)
{
	bus_addr_t rbus_min_start = RBUS_MIN_START;
	size_t ram = ptoa(physmem);

	if (ram <= 192 * 1024 * 1024UL) {
		/*
		 * <= 192 MB, so try 0.5 GB.  This will work on
		 * Thinkpad 600E (2645-4AU), which fails at 1 GB, and
		 * on some other older machines that may have trouble
		 * with addresses needing more than 20 bits.
		 */
		rbus_min_start = 512 * 1024 * 1024UL;
	}

	if (ram >= 1024 * 1024 * 1024UL) {
		/*
		 * > 1 GB, so try 2 GB.
		 */
		rbus_min_start =  2 * 1024 * 1024 * 1024UL;
	}

	/* Not tested in > 2 GB case. */
	if (ram > 2 * 1024 * 1024 * 1024UL) {
		/*
		 * > 2 GB, so try 3 GB.
		 */
		rbus_min_start =  3 * 1024 * 1024 * 1024UL;
	}

	return (rbus_min_start);
}

/*
 * This function makes an rbus tag for memory space.  This rbus tag
 * shares the all memory region of ex_iomem.
 */
rbus_tag_t
rbus_pccbb_parent_mem(struct device *self, struct pci_attach_args *pa)
{
	bus_addr_t start, rbus_min_start;
	bus_size_t size;
	struct extent *ex;

	size = RBUS_MEM_SIZE;
	start = rbus_min_start = rbus_min_start_hint();
#if NPCIBIOS > 0
	if ((ex = pciaddr_search(PCIADDR_SEARCH_MEM, &start, size)) == NULL)
#endif
	{
		extern struct extent *iomem_ex;
		ex = iomem_ex;
		start = ex->ex_start;

		/* XXX: unfortunately, iomem_ex cannot be used for the
		 * dynamic bus_space allocation.  There are some
		 * hidden memory (or some obstacles which do not
		 * recognised by the kernel) in the region governed by
		 * iomem_ex.  So I decide to use only very high
		 * address region.
		 */

		if (start < rbus_min_start)
			start = rbus_min_start;

		size = ex->ex_end - start;
	}

	return (rbus_new_root_share(pa->pa_memt, ex, start, size, 0));
}

rbus_tag_t
rbus_pccbb_parent_io(struct device *self, struct pci_attach_args *pa)
{
	bus_addr_t start;
	bus_size_t size;
	struct extent *ex;

	size = RBUS_IO_SIZE;
	start = RBUS_IO_START;

#if NPCIBIOS > 0
	if ((ex = pciaddr_search(PCIADDR_SEARCH_IO, &start, size)) == NULL)
#endif
	{
		extern struct extent *ioport_ex;
		ex = ioport_ex;
	}

	return (rbus_new_root_share(pa->pa_iot, ex, start, size, 0));
}

void
pccbb_attach_hook(struct device *parent, struct device *self,
    struct pci_attach_args *pa)
{
}