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
59struct gbus_softc {
60	device_t	sc_dev;
61	int		sc_tlsbnode;	/* node on the TurboLaser */
62};
63
64static int	gbusmatch(device_t, cfdata_t, void *);
65static void	gbusattach(device_t, device_t, void *);
66
67CFATTACH_DECL_NEW(gbus, sizeof(struct gbus_softc),
68    gbusmatch, gbusattach, NULL, NULL);
69
70static int	gbusprint(void *, const char *);
71
72static 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
79static int
80gbusprint(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
90static int
91gbusmatch(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
110static void
111gbusattach(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