1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/*
* Copyright (c) 2010
* Ben Gray <ben.r.gray@gmail.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Ben Gray.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BEN GRAY ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* SCM - System Control Module
*
* Hopefully in the end this module will contain a bunch of utility functions
* for configuring and querying the general system control registers, but for
* now it only does pin(pad) multiplexing.
*
* This is different from the GPIO module in that it is used to configure the
* pins between modules not just GPIO input/output.
*
* This file contains the generic top level driver, however it relies on chip
* specific settings and therefore expects an array of ti_scm_padconf structs
* call ti_padconf_devmap to be located somewhere in the kernel.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/resource.h>
#include <sys/rman.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/resource.h>
#include <dev/fdt/fdt_common.h>
#include <dev/fdt/fdt_pinctrl.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "ti_scm.h"
static struct resource_spec ti_scm_res_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE }, /* Control memory window */
{ -1, 0 }
};
static struct ti_scm_softc *ti_scm_sc;
#define ti_scm_read_4(sc, reg) \
bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
#define ti_scm_write_4(sc, reg, val) \
bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
/*
* Device part of OMAP SCM driver
*/
static int
ti_scm_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "syscon"))
return (ENXIO);
if (ti_scm_sc) {
return (EEXIST);
}
device_set_desc(dev, "TI Control Module");
return (BUS_PROBE_DEFAULT);
}
/**
* ti_scm_attach - attaches the timer to the simplebus
* @dev: new device
*
* Reserves memory and interrupt resources, stores the softc structure
* globally and registers both the timecount and eventtimer objects.
*
* RETURNS
* Zero on sucess or ENXIO if an error occuried.
*/
static int
ti_scm_attach(device_t dev)
{
struct ti_scm_softc *sc = device_get_softc(dev);
sc->sc_dev = dev;
if (bus_alloc_resources(dev, ti_scm_res_spec, sc->sc_res)) {
device_printf(dev, "could not allocate resources\n");
return (ENXIO);
}
/* Global timer interface */
sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
ti_scm_sc = sc;
return (0);
}
int
ti_scm_reg_read_4(uint32_t reg, uint32_t *val)
{
if (!ti_scm_sc)
return (ENXIO);
*val = ti_scm_read_4(ti_scm_sc, reg);
return (0);
}
int
ti_scm_reg_write_4(uint32_t reg, uint32_t val)
{
if (!ti_scm_sc)
return (ENXIO);
ti_scm_write_4(ti_scm_sc, reg, val);
return (0);
}
static device_method_t ti_scm_methods[] = {
DEVMETHOD(device_probe, ti_scm_probe),
DEVMETHOD(device_attach, ti_scm_attach),
{ 0, 0 }
};
static driver_t ti_scm_driver = {
"ti_scm",
ti_scm_methods,
sizeof(struct ti_scm_softc),
};
static devclass_t ti_scm_devclass;
DRIVER_MODULE(ti_scm, simplebus, ti_scm_driver, ti_scm_devclass, 0, 0);
|
