]> CyberLeo.Net >> Repos - FreeBSD/FreeBSD.git/blob - sys/dev/bhnd/cores/chipc/bhnd_pmu_chipc.c
Update to bmake-20171028
[FreeBSD/FreeBSD.git] / sys / dev / bhnd / cores / chipc / bhnd_pmu_chipc.c
1 /*-
2  * Copyright (c) 2016 Landon Fuller <landon@landonf.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer,
10  *    without modification.
11  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
13  *    redistribution must be conditioned upon including a substantially
14  *    similar Disclaimer requirement for further binary redistribution.
15  *
16  * NO WARRANTY
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
22  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27  * THE POSSIBILITY OF SUCH DAMAGES.
28  */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 /*
34  * ChipCommon attachment support for the bhnd(4) PMU driver.
35  * 
36  * Supports non-AOB ("Always-on Bus") devices that map the PMU register blocks
37  * via the ChipCommon core, rather than vending a distinct PMU core on the
38  * bhnd bus.
39  */
40
41 #include <sys/param.h>
42 #include <sys/kernel.h>
43 #include <sys/bus.h>
44 #include <sys/limits.h>
45 #include <sys/malloc.h>
46 #include <sys/module.h>
47 #include <sys/systm.h>
48
49 #include <dev/bhnd/bhnd.h>
50
51 #include <dev/bhnd/cores/pmu/bhnd_pmuvar.h>
52 #include <dev/bhnd/cores/pmu/bhnd_pmureg.h>
53
54 #include "bhnd_chipc_if.h"
55 #include "bhnd_pmu_if.h"
56
57 #include "chipcvar.h"
58
59 static int
60 bhnd_pmu_chipc_probe(device_t dev)
61 {
62         struct bhnd_pmu_softc   *sc;
63         struct chipc_caps       *ccaps;
64         struct chipc_softc      *chipc_sc;
65         device_t                 chipc;
66         char                     desc[34];
67         int                      error;
68         uint32_t                 pcaps;
69         uint8_t                  rev;
70
71         sc = device_get_softc(dev);
72
73         /* Look for chipc parent */
74         chipc = device_get_parent(dev);
75         if (device_get_devclass(chipc) != devclass_find("bhnd_chipc"))
76                 return (ENXIO);
77
78         /* Check the chipc PMU capability flag. */
79         ccaps = BHND_CHIPC_GET_CAPS(chipc);
80         if (!ccaps->pmu)
81                 return (ENXIO);
82
83         /* Delegate to common driver implementation */
84         if ((error = bhnd_pmu_probe(dev)) > 0)
85                 return (error);
86
87         /* Fetch PMU capability flags */
88         chipc_sc = device_get_softc(chipc);
89         pcaps = bhnd_bus_read_4(chipc_sc->core, BHND_PMU_CAP);
90
91         /* Set description */
92         rev = BHND_PMU_GET_BITS(pcaps, BHND_PMU_CAP_REV);
93         snprintf(desc, sizeof(desc), "Broadcom ChipCommon PMU, rev %hhu", rev);
94         device_set_desc_copy(dev, desc);
95
96         return (BUS_PROBE_NOWILDCARD);
97 }
98
99 static int
100 bhnd_pmu_chipc_attach(device_t dev)
101 {
102         struct chipc_softc      *chipc_sc;
103         struct bhnd_resource    *r;
104
105         /* Fetch core registers from ChipCommon parent */
106         chipc_sc = device_get_softc(device_get_parent(dev));
107         r = chipc_sc->core;
108
109         return (bhnd_pmu_attach(dev, r));
110 }
111
112 static device_method_t bhnd_pmu_chipc_methods[] = {
113         /* Device interface */
114         DEVMETHOD(device_probe,                 bhnd_pmu_chipc_probe),
115         DEVMETHOD(device_attach,                bhnd_pmu_chipc_attach),
116
117         DEVMETHOD_END
118 };
119
120 DEFINE_CLASS_1(bhnd_pmu, bhnd_pmu_chipc_driver, bhnd_pmu_chipc_methods,
121     sizeof(struct bhnd_pmu_softc), bhnd_pmu_driver);
122 EARLY_DRIVER_MODULE(bhnd_pmu_chipc, bhnd_chipc, bhnd_pmu_chipc_driver,
123     bhnd_pmu_devclass, NULL, NULL, BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE);
124
125 MODULE_DEPEND(bhnd_pmu_chipc, bhnd, 1, 1, 1);
126 MODULE_VERSION(bhnd_pmu_chipc, 1);