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      1 /*	$NetBSD: lebuffer.c,v 1.41 2022/09/25 18:03:04 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: lebuffer.c,v 1.41 2022/09/25 18:03:04 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/kernel.h>
     38 #include <sys/errno.h>
     39 #include <sys/device.h>
     40 
     41 #include <sys/bus.h>
     42 #include <machine/autoconf.h>
     43 #include <sys/cpu.h>
     44 
     45 #include <dev/sbus/sbusvar.h>
     46 #include <dev/sbus/lebuffervar.h>
     47 
     48 int	lebufprint(void *, const char *);
     49 int	lebufmatch(device_t, cfdata_t, void *);
     50 void	lebufattach(device_t, device_t, void *);
     51 
     52 CFATTACH_DECL_NEW(lebuffer, sizeof(struct lebuf_softc),
     53     lebufmatch, lebufattach, NULL, NULL);
     54 
     55 int
     56 lebufprint(void *aux, const char *busname)
     57 {
     58 
     59 	sbus_print(aux, busname);
     60 	return (UNCONF);
     61 }
     62 
     63 int
     64 lebufmatch(device_t parent, cfdata_t cf, void *aux)
     65 {
     66 	struct sbus_attach_args *sa = aux;
     67 
     68 	return (strcmp(cf->cf_name, sa->sa_name) == 0);
     69 }
     70 
     71 /*
     72  * Attach all the sub-devices we can find
     73  */
     74 void
     75 lebufattach(device_t parent, device_t self, void *aux)
     76 {
     77 	struct sbus_attach_args *sa = aux;
     78 	struct lebuf_softc *sc = device_private(self);
     79 	struct sbus_softc *sbsc = device_private(parent);
     80 	int node;
     81 	int sbusburst;
     82 	bus_space_tag_t bt = sa->sa_bustag;
     83 	bus_dma_tag_t	dt = sa->sa_dmatag;
     84 	bus_space_handle_t bh;
     85 
     86 	sc->sc_dev = self;
     87 
     88 	if (sbus_bus_map(bt, sa->sa_slot, sa->sa_offset, sa->sa_size,
     89 			 BUS_SPACE_MAP_LINEAR, &bh) != 0) {
     90 		aprint_error(": cannot map registers\n");
     91 		return;
     92 	}
     93 
     94 	/*
     95 	 * This device's "register space" is just a buffer where the
     96 	 * Lance ring-buffers can be stored. Note the buffer's location
     97 	 * and size, so the `le' driver can pick them up.
     98 	 */
     99 	sc->sc_buffer = bus_space_vaddr(bt, bh);
    100 	sc->sc_bufsiz = sa->sa_size;
    101 
    102 	node = sc->sc_node = sa->sa_node;
    103 
    104 	/*
    105 	 * Get transfer burst size from PROM
    106 	 */
    107 	sbusburst = sbsc->sc_burst;
    108 	if (sbusburst == 0)
    109 		sbusburst = SBUS_BURST_32 - 1; /* 1->16 */
    110 
    111 	sc->sc_burst = prom_getpropint(node, "burst-sizes", -1);
    112 	if (sc->sc_burst == -1)
    113 		/* take SBus burst sizes */
    114 		sc->sc_burst = sbusburst;
    115 
    116 	/* Clamp at parent's burst sizes */
    117 	sc->sc_burst &= sbusburst;
    118 
    119 	printf(": %dK memory\n", sc->sc_bufsiz / 1024);
    120 
    121 	/* search through children */
    122 	devhandle_t selfh = device_handle(self);
    123 	for (node = firstchild(node); node; node = nextsibling(node)) {
    124 		struct sbus_attach_args sax;
    125 		sbus_setup_attach_args(sbsc,
    126 				       bt, dt, node, &sax);
    127 		(void)config_found(self, (void *)&sax, lebufprint,
    128 		    CFARGS(.devhandle = prom_node_to_devhandle(selfh, node)));
    129 		sbus_destroy_attach_args(&sax);
    130 	}
    131 }
    132