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