1 /*-
2 * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
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/param.h>
28 #include <sys/systm.h>
29 #include <sys/bus.h>
30 #include <sys/kernel.h>
31 #include <sys/limits.h>
32 #include <sys/lock.h>
33 #include <sys/module.h>
34 #include <sys/mutex.h>
35 #include <sys/resource.h>
36 #include <sys/rman.h>
37 #include <sys/sysctl.h>
38
39 #include <machine/bus.h>
40
41 #include <dev/fdt/simplebus.h>
42 #include <dev/ofw/openfirm.h>
43 #include <dev/ofw/ofw_bus.h>
44 #include <dev/ofw/ofw_bus_subr.h>
45
46 #include <arm/ti/ti_sysc.h>
47
48 #include <dev/syscon/syscon.h>
49 #include "syscon_if.h"
50
51 #include "am335x_pwm.h"
52 #include "am335x_scm.h"
53
54 #define PWMSS_IDVER 0x00
55 #define PWMSS_SYSCONFIG 0x04
56 #define PWMSS_CLKCONFIG 0x08
57 #define CLKCONFIG_EPWMCLK_EN (1 << 8)
58 #define PWMSS_CLKSTATUS 0x0C
59
60 /* TRM chapter 2 memory map table 2-3 + VER register location */
61 #define PWMSS_REV_0 0x0000
62 #define PWMSS_REV_1 0x2000
63 #define PWMSS_REV_2 0x4000
64
65 static device_probe_t am335x_pwmss_probe;
66 static device_attach_t am335x_pwmss_attach;
67 static device_detach_t am335x_pwmss_detach;
68
69 struct am335x_pwmss_softc {
70 struct simplebus_softc sc_simplebus;
71 device_t sc_dev;
72 struct syscon *syscon;
73 };
74
75 static device_method_t am335x_pwmss_methods[] = {
76 DEVMETHOD(device_probe, am335x_pwmss_probe),
77 DEVMETHOD(device_attach, am335x_pwmss_attach),
78 DEVMETHOD(device_detach, am335x_pwmss_detach),
79
80 DEVMETHOD_END
81 };
82
83 static int
am335x_pwmss_probe(device_t dev)84 am335x_pwmss_probe(device_t dev)
85 {
86
87 if (!ofw_bus_status_okay(dev))
88 return (ENXIO);
89
90 if (!ofw_bus_is_compatible(dev, "ti,am33xx-pwmss"))
91 return (ENXIO);
92
93 device_set_desc(dev, "AM335x PWM");
94
95 return (BUS_PROBE_DEFAULT);
96 }
97
98 static int
am335x_pwmss_attach(device_t dev)99 am335x_pwmss_attach(device_t dev)
100 {
101 struct am335x_pwmss_softc *sc;
102 uint32_t reg, id;
103 uint64_t rev_address;
104 phandle_t node, opp_table;
105
106 sc = device_get_softc(dev);
107 sc->sc_dev = dev;
108
109 /* FIXME: For now; Go and kidnap syscon from opp-table */
110 opp_table = OF_finddevice("/opp-table");
111 if (opp_table == -1) {
112 device_printf(dev, "Cant find /opp-table\n");
113 return (ENXIO);
114 }
115 if (!OF_hasprop(opp_table, "syscon")) {
116 device_printf(dev, "/opp-table doesnt have required syscon property\n");
117 return (ENXIO);
118 }
119 if (syscon_get_by_ofw_property(dev, opp_table, "syscon", &sc->syscon) != 0) {
120 device_printf(dev, "Failed to get syscon\n");
121 return (ENXIO);
122 }
123
124 ti_sysc_clock_enable(device_get_parent(dev));
125
126 rev_address = ti_sysc_get_rev_address(device_get_parent(dev));
127 switch (rev_address) {
128 case PWMSS_REV_0:
129 id = 0;
130 break;
131 case PWMSS_REV_1:
132 id = 1;
133 break;
134 case PWMSS_REV_2:
135 id = 2;
136 break;
137 }
138
139 reg = SYSCON_READ_4(sc->syscon, SCM_PWMSS_CTRL);
140 reg |= (1 << id);
141 SYSCON_WRITE_4(sc->syscon, SCM_PWMSS_CTRL, reg);
142
143 node = ofw_bus_get_node(dev);
144
145 if (node == -1)
146 return (ENXIO);
147
148 simplebus_init(dev, node);
149
150 /*
151 * Allow devices to identify.
152 */
153 bus_generic_probe(dev);
154
155 /*
156 * Now walk the OFW tree and attach top-level devices.
157 */
158 for (node = OF_child(node); node > 0; node = OF_peer(node))
159 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
160
161 return (bus_generic_attach(dev));
162 }
163
164 static int
am335x_pwmss_detach(device_t dev)165 am335x_pwmss_detach(device_t dev)
166 {
167
168 return (0);
169 }
170
171 DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods,
172 sizeof(struct am335x_pwmss_softc), simplebus_driver);
173 DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, 0, 0);
174 MODULE_VERSION(am335x_pwmss, 1);
175 MODULE_DEPEND(am335x_pwmss, ti_sysc, 1, 1, 1);
176