1/*-
2 * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
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 * Vybrid Family System Reset Controller (SRC)
29 * Chapter 18, Vybrid Reference Manual, Rev. 5, 07/2013
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: releng/10.2/sys/arm/freescale/vybrid/vf_src.c 266152 2014-05-15 16:11:06Z ian $");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/bus.h>
38#include <sys/kernel.h>
39#include <sys/module.h>
40#include <sys/malloc.h>
41#include <sys/rman.h>
42#include <sys/timeet.h>
43#include <sys/timetc.h>
44#include <sys/watchdog.h>
45
46#include <dev/fdt/fdt_common.h>
47#include <dev/ofw/openfirm.h>
48#include <dev/ofw/ofw_bus.h>
49#include <dev/ofw/ofw_bus_subr.h>
50
51#include <machine/bus.h>
52#include <machine/fdt.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
76struct src_softc {
77	struct resource		*res[1];
78	bus_space_tag_t		bst;
79	bus_space_handle_t	bsh;
80};
81
82struct src_softc *src_sc;
83
84static struct resource_spec src_spec[] = {
85	{ SYS_RES_MEMORY,       0,      RF_ACTIVE },
86	{ -1, 0 }
87};
88
89int
90src_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
101static int
102src_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
115static int
116src_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
136static device_method_t src_methods[] = {
137	DEVMETHOD(device_probe,		src_probe),
138	DEVMETHOD(device_attach,	src_attach),
139	{ 0, 0 }
140};
141
142static driver_t src_driver = {
143	"src",
144	src_methods,
145	sizeof(struct src_softc),
146};
147
148static devclass_t src_devclass;
149
150DRIVER_MODULE(src, simplebus, src_driver, src_devclass, 0, 0);
151