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
gbusprint(void * aux,const char * pnp)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
gbusmatch(device_t parent,cfdata_t cf,void * aux)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
gbusattach(device_t parent,device_t self,void * aux)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