1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
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 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * Vybrid Family System Reset Controller (SRC)
31 * Chapter 18, Vybrid Reference Manual, Rev. 5, 07/2013
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/bus.h>
40 #include <sys/kernel.h>
41 #include <sys/module.h>
42 #include <sys/malloc.h>
43 #include <sys/rman.h>
44 #include <sys/timeet.h>
45 #include <sys/timetc.h>
46 #include <sys/watchdog.h>
47
48 #include <dev/ofw/openfirm.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <dev/ofw/ofw_bus_subr.h>
51
52 #include <machine/bus.h>
53 #include <machine/cpu.h>
54 #include <machine/intr.h>
55
56 #include <arm/freescale/vybrid/vf_src.h>
57 #include <arm/freescale/vybrid/vf_common.h>
58
59 #define SRC_SCR 0x00 /* SRC Control Register */
60 #define SRC_SBMR1 0x04 /* SRC Boot Mode Register 1 */
61 #define SRC_SRSR 0x08 /* SRC Status Register */
62 #define SRC_SECR 0x0C /* SRC_SECR */
63 #define SRC_SICR 0x14 /* SRC Reset Interrupt Configuration Register */
64 #define SRC_SIMR 0x18 /* SRC Interrupt Masking Register */
65 #define SRC_SBMR2 0x1C /* SRC Boot Mode Register 2 */
66 #define SRC_GPR0 0x20 /* General Purpose Register */
67 #define SRC_GPR1 0x24 /* General Purpose Register */
68 #define SRC_GPR2 0x28 /* General Purpose Register */
69 #define SRC_GPR3 0x2C /* General Purpose Register */
70 #define SRC_GPR4 0x30 /* General Purpose Register */
71 #define SRC_MISC0 0x4C /* MISC0 */
72 #define SRC_MISC1 0x50 /* MISC1 */
73 #define SRC_MISC2 0x54 /* MISC2 */
74 #define SRC_MISC3 0x58 /* MISC3 */
75
76 struct src_softc {
77 struct resource *res[1];
78 bus_space_tag_t bst;
79 bus_space_handle_t bsh;
80 };
81
82 struct src_softc *src_sc;
83
84 static struct resource_spec src_spec[] = {
85 { SYS_RES_MEMORY, 0, RF_ACTIVE },
86 { -1, 0 }
87 };
88
89 int
90 src_swreset(void)
91 {
92
93 if (src_sc == NULL)
94 return (1);
95
96 WRITE4(src_sc, SRC_SCR, SW_RST);
97
98 return (0);
99 }
100
101 static int
102 src_probe(device_t dev)
103 {
104
105 if (!ofw_bus_status_okay(dev))
106 return (ENXIO);
107
108 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-src"))
109 return (ENXIO);
110
111 device_set_desc(dev, "Vybrid Family System Reset Controller");
112 return (BUS_PROBE_DEFAULT);
113 }
114
115 static int
116 src_attach(device_t dev)
117 {
118 struct src_softc *sc;
119
120 sc = device_get_softc(dev);
121
122 if (bus_alloc_resources(dev, src_spec, sc->res)) {
123 device_printf(dev, "could not allocate resources\n");
124 return (ENXIO);
125 }
126
127 /* Memory interface */
128 sc->bst = rman_get_bustag(sc->res[0]);
129 sc->bsh = rman_get_bushandle(sc->res[0]);
130
131 src_sc = sc;
132
133 return (0);
134 }
135
136 static device_method_t src_methods[] = {
137 DEVMETHOD(device_probe, src_probe),
138 DEVMETHOD(device_attach, src_attach),
139 { 0, 0 }
140 };
141
142 static driver_t src_driver = {
143 "src",
144 src_methods,
145 sizeof(struct src_softc),
146 };
147
148 static devclass_t src_devclass;
149
150 DRIVER_MODULE(src, simplebus, src_driver, src_devclass, 0, 0);
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