1 /*-
2 * Copyright (c) 2016 Emmanuel Vadot <manu@freebsd.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 /*
27 * Allwinner Touch Sreen driver
28 * Touch screen part is not done, only the thermal sensor part is.
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
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/rman.h>
40 #include <sys/sysctl.h>
41 #include <machine/bus.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 #define READ(_sc, _r) bus_read_4((_sc)->res[0], (_r))
48 #define WRITE(_sc, _r, _v) bus_write_4((_sc)->res[0], (_r), (_v))
49
50 /* Control register 0 */
51 #define TP_CTRL0 0x00
52 #define TP_CTRL0_TACQ(x) ((x & 0xFF) << 0)
53 #define TP_CTRL0_FS_DIV(x) ((x & 0xF) << 16)
54 #define TP_CTRL0_CLK_DIV(x) ((x & 0x3) << 20)
55 #define TP_CTRL0_CLK_SELECT(x) ((x & 0x1) << 22)
56
57 /* Control register 1 */
58 #define TP_CTRL1 0x04
59 #define TP_CTRL1_MODE_EN (1 << 4)
60
61 /* Control register 2 */
62 #define TP_CTRL2 0x08
63
64 /* Control register 3 */
65 #define TP_CTRL3 0x0C
66
67 /* Int/FIFO control register */
68 #define TP_FIFOC 0x10
69 #define TP_FIFOC_TEMP_IRQ_ENABLE (1 << 18)
70
71 /* Int/FIFO status register */
72 #define TP_FIFOS 0x14
73 #define TP_FIFOS_TEMP_IRQ_PENDING (1 << 18)
74
75 /* Temperature Period Register */
76 #define TP_TPR 0x18
77 #define TP_TPR_TEMP_EN (1 << 16)
78 #define TP_TPR_TEMP_PERIOD(x) (x << 0)
79
80 /* Common data register */
81 #define TP_CDAT 0x1C
82
83 /* Temperature data register */
84 #define TEMP_DATA 0x20
85
86 /* TP Data register*/
87 #define TP_DATA 0x24
88
89 /* TP IO config register */
90 #define TP_IO_CONFIG 0x28
91
92 /* TP IO port data register */
93 #define TP_IO_DATA 0x2C
94
95 struct aw_ts_softc {
96 device_t dev;
97 struct resource * res[2];
98 void * intrhand;
99 int temp_data;
100 int temp_offset;
101 int temp_step;
102 };
103
104 static struct resource_spec aw_ts_spec[] = {
105 { SYS_RES_MEMORY, 0, RF_ACTIVE },
106 { SYS_RES_IRQ, 0, RF_ACTIVE | RF_SHAREABLE },
107 { -1, 0 }
108 };
109
110 #define A10_TS 1
111 #define A13_TS 2
112
113 #define AW_TS_TEMP_SYSCTL 1
114
115 static struct ofw_compat_data compat_data[] = {
116 {"allwinner,sun4i-a10-ts", A10_TS},
117 {"allwinner,sun5i-a13-ts", A13_TS},
118 {NULL, 0}
119 };
120
121 static void
122 aw_ts_intr(void *arg)
123 {
124 struct aw_ts_softc *sc;
125 int val;
126
127 sc= (struct aw_ts_softc *)arg;
128
129 val = READ(sc, TP_FIFOS);
130 if (val & TP_FIFOS_TEMP_IRQ_PENDING) {
131 /* Convert the value to millicelsius then millikelvin */
132 sc->temp_data = (READ(sc, TEMP_DATA) * sc->temp_step - sc->temp_offset)
133 + 273150;
134 }
135
136 WRITE(sc, TP_FIFOS, val);
137 }
138
139 static int
140 aw_ts_probe(device_t dev)
141 {
142
143 if (!ofw_bus_status_okay(dev))
144 return (ENXIO);
145
146 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
147 return (ENXIO);
148
149 device_set_desc(dev, "Allwinner Touch Screen controller");
150 return (BUS_PROBE_DEFAULT);
151 }
152
153 static int
154 aw_ts_attach(device_t dev)
155 {
156 struct aw_ts_softc *sc;
157
158 sc = device_get_softc(dev);
159 sc->dev = dev;
160
161 if (bus_alloc_resources(dev, aw_ts_spec, sc->res) != 0) {
162 device_printf(dev, "could not allocate memory resource\n");
163 return (ENXIO);
164 }
165
166 if (bus_setup_intr(dev, sc->res[1],
167 INTR_TYPE_MISC | INTR_MPSAFE, NULL, aw_ts_intr, sc,
168 &sc->intrhand)) {
169 bus_release_resources(dev, aw_ts_spec, sc->res);
170 device_printf(dev, "cannot setup interrupt handler\n");
171 return (ENXIO);
172 }
173
174 /*
175 * Thoses magic values were taken from linux which take them from
176 * the allwinner SDK or found them by deduction
177 */
178 switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
179 case A10_TS:
180 sc->temp_offset = 257000;
181 sc->temp_step = 133;
182 break;
183 case A13_TS:
184 sc->temp_offset = 144700;
185 sc->temp_step = 100;
186 break;
187 }
188
189 /* Enable clock and set divisers */
190 WRITE(sc, TP_CTRL0, TP_CTRL0_CLK_SELECT(0) |
191 TP_CTRL0_CLK_DIV(2) |
192 TP_CTRL0_FS_DIV(7) |
193 TP_CTRL0_TACQ(63));
194
195 /* Enable TS module */
196 WRITE(sc, TP_CTRL1, TP_CTRL1_MODE_EN);
197
198 /* Enable Temperature, period is ~2s */
199 WRITE(sc, TP_TPR, TP_TPR_TEMP_EN | TP_TPR_TEMP_PERIOD(1953));
200
201 /* Enable temp irq */
202 WRITE(sc, TP_FIFOC, TP_FIFOC_TEMP_IRQ_ENABLE);
203
204 /* Add sysctl */
205 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
206 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
207 OID_AUTO, "temperature",
208 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
209 &sc->temp_data, 0, sysctl_handle_int,
210 "IK3", "CPU Temperature");
211
212 return (0);
213 }
214
215 static device_method_t aw_ts_methods[] = {
216 DEVMETHOD(device_probe, aw_ts_probe),
217 DEVMETHOD(device_attach, aw_ts_attach),
218
219 DEVMETHOD_END
220 };
221
222 static driver_t aw_ts_driver = {
223 "aw_ts",
224 aw_ts_methods,
225 sizeof(struct aw_ts_softc),
226 };
227 static devclass_t aw_ts_devclass;
228
229 DRIVER_MODULE(aw_ts, simplebus, aw_ts_driver, aw_ts_devclass, 0, 0);
Cache object: f285008bf363ba0e9d25a406c4f59ff0
|