1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
35 #include <sys/systm.h>
36 #include <sys/bus.h>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/malloc.h>
40 #include <sys/rman.h>
41 #include <sys/timeet.h>
42 #include <sys/timetc.h>
43 #include <sys/watchdog.h>
44
45 #include <dev/ofw/openfirm.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
48
49 #include <machine/bus.h>
50 #include <machine/cpu.h>
51 #include <machine/intr.h>
52
53 #include <arm/freescale/vybrid/vf_src.h>
54 #include <arm/freescale/vybrid/vf_common.h>
55
56 #define SRC_SCR 0x00 /* SRC Control Register */
57 #define SRC_SBMR1 0x04 /* SRC Boot Mode Register 1 */
58 #define SRC_SRSR 0x08 /* SRC Status Register */
59 #define SRC_SECR 0x0C /* SRC_SECR */
60 #define SRC_SICR 0x14 /* SRC Reset Interrupt Configuration Register */
61 #define SRC_SIMR 0x18 /* SRC Interrupt Masking Register */
62 #define SRC_SBMR2 0x1C /* SRC Boot Mode Register 2 */
63 #define SRC_GPR0 0x20 /* General Purpose Register */
64 #define SRC_GPR1 0x24 /* General Purpose Register */
65 #define SRC_GPR2 0x28 /* General Purpose Register */
66 #define SRC_GPR3 0x2C /* General Purpose Register */
67 #define SRC_GPR4 0x30 /* General Purpose Register */
68 #define SRC_MISC0 0x4C /* MISC0 */
69 #define SRC_MISC1 0x50 /* MISC1 */
70 #define SRC_MISC2 0x54 /* MISC2 */
71 #define SRC_MISC3 0x58 /* MISC3 */
72
73 struct src_softc {
74 struct resource *res[1];
75 bus_space_tag_t bst;
76 bus_space_handle_t bsh;
77 };
78
79 struct src_softc *src_sc;
80
81 static struct resource_spec src_spec[] = {
82 { SYS_RES_MEMORY, 0, RF_ACTIVE },
83 { -1, 0 }
84 };
85
86 int
src_swreset(void)87 src_swreset(void)
88 {
89
90 if (src_sc == NULL)
91 return (1);
92
93 WRITE4(src_sc, SRC_SCR, SW_RST);
94
95 return (0);
96 }
97
98 static int
src_probe(device_t dev)99 src_probe(device_t dev)
100 {
101
102 if (!ofw_bus_status_okay(dev))
103 return (ENXIO);
104
105 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-src"))
106 return (ENXIO);
107
108 device_set_desc(dev, "Vybrid Family System Reset Controller");
109 return (BUS_PROBE_DEFAULT);
110 }
111
112 static int
src_attach(device_t dev)113 src_attach(device_t dev)
114 {
115 struct src_softc *sc;
116
117 sc = device_get_softc(dev);
118
119 if (bus_alloc_resources(dev, src_spec, sc->res)) {
120 device_printf(dev, "could not allocate resources\n");
121 return (ENXIO);
122 }
123
124 /* Memory interface */
125 sc->bst = rman_get_bustag(sc->res[0]);
126 sc->bsh = rman_get_bushandle(sc->res[0]);
127
128 src_sc = sc;
129
130 return (0);
131 }
132
133 static device_method_t src_methods[] = {
134 DEVMETHOD(device_probe, src_probe),
135 DEVMETHOD(device_attach, src_attach),
136 { 0, 0 }
137 };
138
139 static driver_t src_driver = {
140 "src",
141 src_methods,
142 sizeof(struct src_softc),
143 };
144
145 DRIVER_MODULE(src, simplebus, src_driver, 0, 0);
146