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[FreeBSD/releng/10.2.git] / sys / arm / lpc / lpc_pwr.c
1 /*-
2  * Copyright (c) 2011 Jakub Wojciech Klama <jceel@FreeBSD.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  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <sys/malloc.h>
37 #include <sys/rman.h>
38 #include <machine/bus.h>
39 #include <machine/intr.h>
40
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
43
44 #include <arm/lpc/lpcreg.h>
45 #include <arm/lpc/lpcvar.h>
46
47 struct lpc_pwr_softc {
48         device_t                dp_dev;
49         struct resource *       dp_mem_res;
50         bus_space_tag_t         dp_bst;
51         bus_space_handle_t      dp_bsh;
52 };
53
54 static struct lpc_pwr_softc *lpc_pwr_sc = NULL;
55
56 static int lpc_pwr_probe(device_t);
57 static int lpc_pwr_attach(device_t);
58
59 #define lpc_pwr_read_4(_sc, _reg)                       \
60     bus_space_read_4((_sc)->dp_bst, (_sc)->dp_bsh, _reg)
61 #define lpc_pwr_write_4(_sc, _reg, _val)                \
62     bus_space_write_4((_sc)->dp_bst, (_sc)->dp_bsh, _reg, _val)
63
64 static int
65 lpc_pwr_probe(device_t dev)
66 {
67         
68         if (!ofw_bus_status_okay(dev))
69                 return (ENXIO);
70
71         if (!ofw_bus_is_compatible(dev, "lpc,pwr"))
72                 return (ENXIO);
73
74         device_set_desc(dev, "LPC32x0 Power Controller");
75         return (BUS_PROBE_DEFAULT);
76 }
77
78 static int
79 lpc_pwr_attach(device_t dev)
80 {
81         struct lpc_pwr_softc *sc = device_get_softc(dev);
82         int rid;
83
84         sc->dp_dev = dev;
85
86         rid = 0;
87         sc->dp_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 
88             RF_ACTIVE);
89         if (!sc->dp_mem_res) {
90                 device_printf(dev, "cannot allocate memory window\n");
91                 return (ENXIO);
92         }
93
94         sc->dp_bst = rman_get_bustag(sc->dp_mem_res);
95         sc->dp_bsh = rman_get_bushandle(sc->dp_mem_res);
96
97         lpc_pwr_sc = sc;
98
99         return (0);
100 }
101
102 uint32_t
103 lpc_pwr_read(device_t dev, int reg)
104 {
105         return (lpc_pwr_read_4(lpc_pwr_sc, reg));
106 }
107
108 void
109 lpc_pwr_write(device_t dev, int reg, uint32_t value)
110 {
111         lpc_pwr_write_4(lpc_pwr_sc, reg, value);
112 }
113
114 static device_method_t lpc_pwr_methods[] = {
115         /* Device interface */
116         DEVMETHOD(device_probe,         lpc_pwr_probe),
117         DEVMETHOD(device_attach,        lpc_pwr_attach),
118         { 0, 0 }
119 };
120
121 static devclass_t lpc_pwr_devclass;
122
123 static driver_t lpc_pwr_driver = {
124         "pwr",
125         lpc_pwr_methods,
126         sizeof(struct lpc_pwr_softc),
127 };
128
129 DRIVER_MODULE(pwr, simplebus, lpc_pwr_driver, lpc_pwr_devclass, 0, 0);