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      1 /* $NetBSD: gbus.c,v 1.2 2024/03/06 05:33:09 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1997 by Matthew Jacob
      5  * NASA AMES Research Center.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice immediately at the beginning of the file, without modification,
     13  *    this list of conditions, and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. The name of the author may not be used to endorse or promote products
     18  *    derived from this software without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
     24  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 /*
     34  * Autoconfiguration and support routines for the Gbus: the internal
     35  * bus on AlphaServer CPU modules.
     36  */
     37 
     38 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     39 
     40 __KERNEL_RCSID(0, "$NetBSD: gbus.c,v 1.2 2024/03/06 05:33:09 thorpej Exp $");
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/device.h>
     45 
     46 #include <machine/rpb.h>
     47 #include <machine/pte.h>
     48 
     49 #include <alpha/gbus/gbusreg.h>
     50 #include <alpha/gbus/gbusvar.h>
     51 
     52 #include <alpha/tlsb/tlsbreg.h>
     53 #include <alpha/tlsb/tlsbvar.h>
     54 
     55 #include "locators.h"
     56 
     57 #define KV(_addr)	((void *)ALPHA_PHYS_TO_K0SEG((_addr)))
     58 
     59 struct gbus_softc {
     60 	device_t	sc_dev;
     61 	int		sc_tlsbnode;	/* node on the TurboLaser */
     62 };
     63 
     64 static int	gbusmatch(device_t, cfdata_t, void *);
     65 static void	gbusattach(device_t, device_t, void *);
     66 
     67 CFATTACH_DECL_NEW(gbus, sizeof(struct gbus_softc),
     68     gbusmatch, gbusattach, NULL, NULL);
     69 
     70 static int	gbusprint(void *, const char *);
     71 
     72 static const struct gbus_attach_args gbus_children[] = {
     73 	{ "zsc",	NULL,	GBUS_DUART0_OFFSET },
     74 	{ "zsc",	NULL,	GBUS_DUART1_OFFSET },
     75 	{ "mcclock",	NULL,	GBUS_CLOCK_OFFSET },
     76 	{ NULL,		NULL,	0 },
     77 };
     78 
     79 static int
     80 gbusprint(void *aux, const char *pnp)
     81 {
     82 	struct gbus_attach_args *ga = aux;
     83 
     84 	if (pnp)
     85 		aprint_normal("%s at %s", ga->ga_name, pnp);
     86 	aprint_normal(" offset 0x%lx", ga->ga_offset);
     87 	return (UNCONF);
     88 }
     89 
     90 static int
     91 gbusmatch(device_t parent, cfdata_t cf, void *aux)
     92 {
     93 	struct tlsb_dev_attach_args *ta = aux;
     94 
     95 	/*
     96 	 * Make sure we're looking for a Gbus.  The Gbus only
     97 	 * "exists" on the CPU module that holds the primary CPU.
     98 	 *
     99 	 * Compute which node this should exist on by dividing the
    100 	 * primary CPU by 2 (since there are up to 2 CPUs per CPU
    101 	 * module).
    102 	 */
    103 	if (TLDEV_ISCPU(ta->ta_dtype) &&
    104 	    ta->ta_node == (hwrpb->rpb_primary_cpu_id / 2))
    105 		return (1);
    106 
    107 	return (0);
    108 }
    109 
    110 static void
    111 gbusattach(device_t parent, device_t self, void *aux)
    112 {
    113 	struct gbus_softc *sc = device_private(self);
    114 	struct tlsb_dev_attach_args *ta = aux;
    115 	const struct gbus_attach_args *ga;
    116 	bus_space_tag_t iot = gbus_io_init(TLSB_GBUS_BASE);
    117 	int locs[GBUSCF_NLOCS];
    118 
    119 	aprint_normal("\n");
    120 
    121 	sc->sc_dev = self;
    122 	sc->sc_tlsbnode = ta->ta_node;
    123 
    124 	/* Attach the children. */
    125 	for (ga = gbus_children; ga->ga_name != NULL; ga++) {
    126 		struct gbus_attach_args gaa = *ga;
    127 		gaa.ga_iot = iot;
    128 		locs[GBUSCF_OFFSET] = gaa.ga_offset;
    129 		config_found(self, &gaa, gbusprint,
    130 		    CFARGS(.submatch = config_stdsubmatch,
    131 			   .locators = locs));
    132 	}
    133 }
    134