1 /*-
2 * Copyright (c) 2016 Stanislav Galabov
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, immediately at the beginning of the file.
11 * 2. The name of the author may not be used to endorse or promote products
12 * derived from this software without specific prior written permission.
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 FOR
18 * 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: releng/12.0/sys/mips/mediatek/mtk_reset.c 297667 2016-04-07 11:08:50Z sgalabov $");
30
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/bus.h>
34 #include <sys/module.h>
35
36 #include <dev/fdt/fdt_common.h>
37 #include <dev/ofw/openfirm.h>
38 #include <dev/ofw/ofw_bus.h>
39 #include <dev/ofw/ofw_bus_subr.h>
40
41 #include <mips/mediatek/fdt_reset.h>
42 #include <mips/mediatek/mtk_sysctl.h>
43
44 #include "fdt_reset_if.h"
45
46 static const struct ofw_compat_data compat_data[] = {
47 { "ralink,rt2880-reset", 1 },
48
49 /* Sentinel */
50 { NULL, 0 }
51 };
52
53 static int
54 mtk_reset_probe(device_t dev)
55 {
56
57 if (!ofw_bus_status_okay(dev))
58 return (ENXIO);
59
60 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
61 return (ENXIO);
62
63 device_set_desc(dev, "MTK Reset Controller");
64
65 return (0);
66 }
67
68 static int
69 mtk_reset_attach(device_t dev)
70 {
71
72 if (device_get_unit(dev) != 0) {
73 device_printf(dev, "Only one reset control allowed\n");
74 return (ENXIO);
75 }
76
77 fdt_reset_register_provider(dev);
78
79 return (0);
80 }
81
82 #define RESET_ASSERT 1
83 #define RESET_DEASSERT 0
84
85 static int
86 mtk_reset_set(device_t dev, int index, int value)
87 {
88 uint32_t mask;
89
90 /* index 0 is SoC reset, indices 1 - 31 are valid peripheral resets */
91 if (index < 1 || index > 31)
92 return (EINVAL);
93
94 mask = (1u << index);
95
96 if (value == RESET_ASSERT)
97 mtk_sysctl_clr_set(SYSCTL_RSTCTRL, 0, mask);
98 else
99 mtk_sysctl_clr_set(SYSCTL_RSTCTRL, mask, 0);
100
101 return (0);
102 }
103
104 static int
105 mtk_reset_assert(device_t dev, int index)
106 {
107
108 return mtk_reset_set(dev, index, RESET_ASSERT);
109 }
110
111 static int
112 mtk_reset_deassert(device_t dev, int index)
113 {
114
115 return mtk_reset_set(dev, index, RESET_DEASSERT);
116 }
117
118 static device_method_t mtk_reset_methods[] = {
119 DEVMETHOD(device_probe, mtk_reset_probe),
120 DEVMETHOD(device_attach, mtk_reset_attach),
121
122 /* fdt_reset interface */
123 DEVMETHOD(fdt_reset_assert, mtk_reset_assert),
124 DEVMETHOD(fdt_reset_deassert, mtk_reset_deassert),
125
126 DEVMETHOD_END
127 };
128
129 static driver_t mtk_reset_driver = {
130 "rstctrl",
131 mtk_reset_methods,
132 0,
133 };
134 static devclass_t mtk_reset_devclass;
135
136 EARLY_DRIVER_MODULE(mtk_reset, simplebus, mtk_reset_driver, mtk_reset_devclass,
137 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_EARLY);
138
139 MODULE_DEPEND(mtk_reset, mtk_sysctl, 1, 1, 1);
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