mtk_sysctl.c revision 302408 
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 * 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#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/mips/mediatek/mtk_sysctl.c 297666 2016-04-07 11:02:49Z sgalabov $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/interrupt.h>
34#include <sys/kernel.h>
35#include <sys/module.h>
36#include <sys/lock.h>
37#include <sys/mutex.h>
38#include <sys/rman.h>
39#include <sys/malloc.h>
40
41#include <machine/fdt.h>
42
43#include <dev/ofw/openfirm.h>
44#include <dev/ofw/ofw_bus.h>
45#include <dev/ofw/ofw_bus_subr.h>
46
47#include <mips/mediatek/mtk_sysctl.h>
48
49#include <dev/fdt/fdt_common.h>
50
51struct mtk_sysctl_softc {
52	device_t	dev;
53	struct resource	*mem_res;
54	int		mem_rid;
55	struct mtx	mtx;
56};
57
58static struct mtk_sysctl_softc *mtk_sysctl_sc = NULL;
59
60static struct ofw_compat_data compat_data[] = {
61	{ "ralink,rt2880-sysc",		1 },
62	{ "ralink,rt3050-sysc",		1 },
63	{ "ralink,rt3352-sysc",		1 },
64	{ "ralink,rt3883-sysc",		1 },
65	{ "ralink,rt5350-sysc",		1 },
66	{ "ralink,mt7620a-sysc",	1 },
67	{ "mtk,mt7621-sysc",		1 },
68
69	/* Sentinel */
70	{ NULL,				0 }
71};
72
73#define MTK_SYSCTL_LOCK(sc)		mtx_lock_spin(&(sc)->mtx)
74#define MTK_SYSCTL_UNLOCK(sc)		mtx_unlock_spin(&(sc)->mtx)
75#define MTK_SYSCTL_LOCK_INIT(sc)		\
76    mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev),	\
77    "mtk_sysctl", MTX_SPIN)
78#define MTK_SYSCTL_LOCK_DESTROY(sc)	mtx_destroy(&(sc)->mtx)
79
80static int
81mtk_sysctl_probe(device_t dev)
82{
83
84	if (!ofw_bus_status_okay(dev))
85		return (ENXIO);
86
87	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
88		return (ENXIO);
89
90	device_set_desc(dev, "MTK System Controller");
91
92	return (BUS_PROBE_DEFAULT);
93}
94
95static int mtk_sysctl_detach(device_t);
96
97static int
98mtk_sysctl_attach(device_t dev)
99{
100	struct mtk_sysctl_softc *sc = device_get_softc(dev);
101
102	if (device_get_unit(dev) != 0 || mtk_sysctl_sc != NULL) {
103		device_printf(dev, "Only one sysctl module supported\n");
104		return (ENXIO);
105	}
106
107	mtk_sysctl_sc = sc;
108
109	/* Map control/status registers. */
110	sc->mem_rid = 0;
111	sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
112	    &sc->mem_rid, RF_ACTIVE);
113
114	if (sc->mem_res == NULL) {
115		device_printf(dev, "couldn't map memory\n");
116		mtk_sysctl_detach(dev);
117		return (ENXIO);
118	}
119
120	sc->dev = dev;
121
122	MTK_SYSCTL_LOCK_INIT(sc);
123
124	return (0);
125}
126
127static int
128mtk_sysctl_detach(device_t dev)
129{
130	struct mtk_sysctl_softc *sc = device_get_softc(dev);
131
132	if (sc->mem_res)
133		bus_release_resource(dev, SYS_RES_MEMORY, sc->mem_rid,
134		    sc->mem_res);
135
136	MTK_SYSCTL_LOCK_DESTROY(sc);
137
138	return(0);
139}
140
141uint32_t
142mtk_sysctl_get(uint32_t reg)
143{
144	uint32_t val;
145
146	MTK_SYSCTL_LOCK(mtk_sysctl_sc);
147	val = bus_read_4(mtk_sysctl_sc->mem_res, reg);
148	MTK_SYSCTL_UNLOCK(mtk_sysctl_sc);
149
150	return (val);
151}
152
153void
154mtk_sysctl_set(uint32_t reg, uint32_t val)
155{
156
157	MTK_SYSCTL_LOCK(mtk_sysctl_sc);
158	bus_write_4(mtk_sysctl_sc->mem_res, reg, val);
159	MTK_SYSCTL_UNLOCK(mtk_sysctl_sc);
160}
161
162void
163mtk_sysctl_clr_set(uint32_t reg, uint32_t clr, uint32_t set)
164{
165	uint32_t val;
166
167	MTK_SYSCTL_LOCK(mtk_sysctl_sc);
168	val = bus_read_4(mtk_sysctl_sc->mem_res, reg);
169	val &= ~(clr);
170	val |= set;
171	bus_write_4(mtk_sysctl_sc->mem_res, reg, val);
172	MTK_SYSCTL_UNLOCK(mtk_sysctl_sc);
173}
174
175static device_method_t mtk_sysctl_methods[] = {
176	DEVMETHOD(device_probe,		mtk_sysctl_probe),
177	DEVMETHOD(device_attach,	mtk_sysctl_attach),
178	DEVMETHOD(device_detach,	mtk_sysctl_detach),
179
180	DEVMETHOD_END
181};
182
183static driver_t mtk_sysctl_driver = {
184	"sysc",
185	mtk_sysctl_methods,
186	sizeof(struct mtk_sysctl_softc),
187};
188static devclass_t mtk_sysctl_devclass;
189
190EARLY_DRIVER_MODULE(mtk_sysctl, simplebus, mtk_sysctl_driver,
191    mtk_sysctl_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_EARLY);
192