/*      $Id: exb.c,v 1.5 2021/08/07 16:19:03 thorpej Exp $      */

/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software developed for The NetBSD Foundation
* by Masao Uebayashi.
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: exb.c,v 1.5 2021/08/07 16:19:03 thorpej Exp $");

#include "locators.h"

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

#include <powerpc/ibm4xx/dcr4xx.h>
#include <powerpc/ibm4xx/dev/exbvar.h>

struct exb_softc {
};

extern const struct exb_conf exb_confs[];

static int exb_match(device_t, cfdata_t, void *);
static void exb_attach(device_t, device_t, void *);
static int exb_print(void *, const char *);

CFATTACH_DECL_NEW(exb, sizeof(struct exb_softc), exb_match, exb_attach,
   NULL, NULL);

static struct powerpc_bus_space exb_bus_space_tag =
   { _BUS_SPACE_BIG_ENDIAN | _BUS_SPACE_MEM_TYPE, 0 };

static int
exb_match(device_t parent, cfdata_t cf, void *aux)
{

       return 1;
}

static void
exb_attach(device_t parent, device_t self, void *aux)
{
       const struct exb_conf *ec = exb_confs;
       uint32_t ebc0_bNcr;
       bus_addr_t base, size;
       int locs[EXBCF_NLOCS];

       printf("\n");

       /* mtdcr needs a constant */
       switch (device_unit(self)) {
       case 0: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B0CR); break;
       case 1: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B1CR); break;
       case 2: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B2CR); break;
       case 3: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B3CR); break;
       case 4: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B4CR); break;
       case 5: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B5CR); break;
       case 6: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B6CR); break;
       case 7: mtdcr(DCR_EBC0_CFGADDR, DCR_EBC0_B7CR); break;
       }
       ebc0_bNcr = mfdcr(DCR_EBC0_CFGDATA);
       base = ebc0_bNcr & 0xfff00000;
       size = 0x00100000 << ((ebc0_bNcr & 0x000e0000) >> 17);

       exb_bus_space_tag.pbs_base = base;
       exb_bus_space_tag.pbs_limit = base + size - 1;

       while (ec->ec_name) {
               struct exb_conf ec1;

               locs[EXBCF_ADDR] = ec->ec_addr;

               ec1 = *ec;
               ec1.ec_bust = exb_get_bus_space_tag();

               config_found(self, &ec1, exb_print,
                   CFARGS(.submatch = config_stdsubmatch,
                          .locators = locs));
               ec++;
       }
}

static int
exb_print(void *aux, const char *bus)
{
       struct exb_conf *ec = aux;

       if (bus)
               return QUIET;

       if (ec->ec_addr)
               printf(" addr %"PRIxBUSADDR, ec->ec_addr);

       return UNCONF;
}

bus_space_tag_t
exb_get_bus_space_tag(void)
{
       static char ex_storage[EXTENT_FIXED_STORAGE_SIZE(8)]
           __attribute__((aligned(8)));
       static int exb_bus_space_tag_inited;

       if (exb_bus_space_tag_inited == 0) {
               if (bus_space_init(&exb_bus_space_tag, "exbtag",
                   ex_storage, sizeof(ex_storage)))
                       panic("exb_attach: Failed to initialise exb_bus_space_tag");
               exb_bus_space_tag_inited = 1;
       }
       return &exb_bus_space_tag;
}