/*      $NetBSD: lebuffer.c,v 1.41 2022/09/25 18:03:04 thorpej Exp $ */

/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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: lebuffer.c,v 1.41 2022/09/25 18:03:04 thorpej Exp $");

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

#include <sys/bus.h>
#include <machine/autoconf.h>
#include <sys/cpu.h>

#include <dev/sbus/sbusvar.h>
#include <dev/sbus/lebuffervar.h>

int     lebufprint(void *, const char *);
int     lebufmatch(device_t, cfdata_t, void *);
void    lebufattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(lebuffer, sizeof(struct lebuf_softc),
   lebufmatch, lebufattach, NULL, NULL);

int
lebufprint(void *aux, const char *busname)
{

       sbus_print(aux, busname);
       return (UNCONF);
}

int
lebufmatch(device_t parent, cfdata_t cf, void *aux)
{
       struct sbus_attach_args *sa = aux;

       return (strcmp(cf->cf_name, sa->sa_name) == 0);
}

/*
* Attach all the sub-devices we can find
*/
void
lebufattach(device_t parent, device_t self, void *aux)
{
       struct sbus_attach_args *sa = aux;
       struct lebuf_softc *sc = device_private(self);
       struct sbus_softc *sbsc = device_private(parent);
       int node;
       int sbusburst;
       bus_space_tag_t bt = sa->sa_bustag;
       bus_dma_tag_t   dt = sa->sa_dmatag;
       bus_space_handle_t bh;

       sc->sc_dev = self;

       if (sbus_bus_map(bt, sa->sa_slot, sa->sa_offset, sa->sa_size,
                        BUS_SPACE_MAP_LINEAR, &bh) != 0) {
               aprint_error(": cannot map registers\n");
               return;
       }

       /*
        * This device's "register space" is just a buffer where the
        * Lance ring-buffers can be stored. Note the buffer's location
        * and size, so the `le' driver can pick them up.
        */
       sc->sc_buffer = bus_space_vaddr(bt, bh);
       sc->sc_bufsiz = sa->sa_size;

       node = sc->sc_node = sa->sa_node;

       /*
        * Get transfer burst size from PROM
        */
       sbusburst = sbsc->sc_burst;
       if (sbusburst == 0)
               sbusburst = SBUS_BURST_32 - 1; /* 1->16 */

       sc->sc_burst = prom_getpropint(node, "burst-sizes", -1);
       if (sc->sc_burst == -1)
               /* take SBus burst sizes */
               sc->sc_burst = sbusburst;

       /* Clamp at parent's burst sizes */
       sc->sc_burst &= sbusburst;

       printf(": %dK memory\n", sc->sc_bufsiz / 1024);

       /* search through children */
       devhandle_t selfh = device_handle(self);
       for (node = firstchild(node); node; node = nextsibling(node)) {
               struct sbus_attach_args sax;
               sbus_setup_attach_args(sbsc,
                                      bt, dt, node, &sax);
               (void)config_found(self, (void *)&sax, lebufprint,
                   CFARGS(.devhandle = prom_node_to_devhandle(selfh, node)));
               sbus_destroy_attach_args(&sax);
       }
}