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/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <sys/rman.h>
37 #include <sys/sysctl.h>
38 #include <machine/bus.h>
39
40 #include <dev/ofw/openfirm.h>
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
43
44 #define READ(_sc, _r) bus_read_4((_sc)->res[0], (_r))
45 #define WRITE(_sc, _r, _v) bus_write_4((_sc)->res[0], (_r), (_v))
46
47 /* Control register 0 */
48 #define TP_CTRL0 0x00
49 #define TP_CTRL0_TACQ(x) ((x & 0xFF) << 0)
50 #define TP_CTRL0_FS_DIV(x) ((x & 0xF) << 16)
51 #define TP_CTRL0_CLK_DIV(x) ((x & 0x3) << 20)
52 #define TP_CTRL0_CLK_SELECT(x) ((x & 0x1) << 22)
53
54 /* Control register 1 */
55 #define TP_CTRL1 0x04
56 #define TP_CTRL1_MODE_EN (1 << 4)
57
58 /* Control register 2 */
59 #define TP_CTRL2 0x08
60
61 /* Control register 3 */
62 #define TP_CTRL3 0x0C
63
64 /* Int/FIFO control register */
65 #define TP_FIFOC 0x10
66 #define TP_FIFOC_TEMP_IRQ_ENABLE (1 << 18)
67
68 /* Int/FIFO status register */
69 #define TP_FIFOS 0x14
70 #define TP_FIFOS_TEMP_IRQ_PENDING (1 << 18)
71
72 /* Temperature Period Register */
73 #define TP_TPR 0x18
74 #define TP_TPR_TEMP_EN (1 << 16)
75 #define TP_TPR_TEMP_PERIOD(x) (x << 0)
76
77 /* Common data register */
78 #define TP_CDAT 0x1C
79
80 /* Temperature data register */
81 #define TEMP_DATA 0x20
82
83 /* TP Data register*/
84 #define TP_DATA 0x24
85
86 /* TP IO config register */
87 #define TP_IO_CONFIG 0x28
88
89 /* TP IO port data register */
90 #define TP_IO_DATA 0x2C
91
92 struct aw_ts_softc {
93 device_t dev;
94 struct resource * res[2];
95 void * intrhand;
96 int temp_data;
97 int temp_offset;
98 int temp_step;
99 };
100
101 static struct resource_spec aw_ts_spec[] = {
102 { SYS_RES_MEMORY, 0, RF_ACTIVE },
103 { SYS_RES_IRQ, 0, RF_ACTIVE | RF_SHAREABLE },
104 { -1, 0 }
105 };
106
107 #define A10_TS 1
108 #define A13_TS 2
109
110 #define AW_TS_TEMP_SYSCTL 1
111
112 static struct ofw_compat_data compat_data[] = {
113 {"allwinner,sun4i-a10-ts", A10_TS},
114 {"allwinner,sun5i-a13-ts", A13_TS},
115 {NULL, 0}
116 };
117
118 static void
aw_ts_intr(void * arg)119 aw_ts_intr(void *arg)
120 {
121 struct aw_ts_softc *sc;
122 int val;
123
124 sc= (struct aw_ts_softc *)arg;
125
126 val = READ(sc, TP_FIFOS);
127 if (val & TP_FIFOS_TEMP_IRQ_PENDING) {
128 /* Convert the value to millicelsius then millikelvin */
129 sc->temp_data = (READ(sc, TEMP_DATA) * sc->temp_step - sc->temp_offset)
130 + 273150;
131 }
132
133 WRITE(sc, TP_FIFOS, val);
134 }
135
136 static int
aw_ts_probe(device_t dev)137 aw_ts_probe(device_t dev)
138 {
139
140 if (!ofw_bus_status_okay(dev))
141 return (ENXIO);
142
143 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
144 return (ENXIO);
145
146 device_set_desc(dev, "Allwinner Touch Screen controller");
147 return (BUS_PROBE_DEFAULT);
148 }
149
150 static int
aw_ts_attach(device_t dev)151 aw_ts_attach(device_t dev)
152 {
153 struct aw_ts_softc *sc;
154
155 sc = device_get_softc(dev);
156 sc->dev = dev;
157
158 if (bus_alloc_resources(dev, aw_ts_spec, sc->res) != 0) {
159 device_printf(dev, "could not allocate memory resource\n");
160 return (ENXIO);
161 }
162
163 if (bus_setup_intr(dev, sc->res[1],
164 INTR_TYPE_MISC | INTR_MPSAFE, NULL, aw_ts_intr, sc,
165 &sc->intrhand)) {
166 bus_release_resources(dev, aw_ts_spec, sc->res);
167 device_printf(dev, "cannot setup interrupt handler\n");
168 return (ENXIO);
169 }
170
171 /*
172 * Thoses magic values were taken from linux which take them from
173 * the allwinner SDK or found them by deduction
174 */
175 switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
176 case A10_TS:
177 sc->temp_offset = 257000;
178 sc->temp_step = 133;
179 break;
180 case A13_TS:
181 sc->temp_offset = 144700;
182 sc->temp_step = 100;
183 break;
184 }
185
186 /* Enable clock and set divisers */
187 WRITE(sc, TP_CTRL0, TP_CTRL0_CLK_SELECT(0) |
188 TP_CTRL0_CLK_DIV(2) |
189 TP_CTRL0_FS_DIV(7) |
190 TP_CTRL0_TACQ(63));
191
192 /* Enable TS module */
193 WRITE(sc, TP_CTRL1, TP_CTRL1_MODE_EN);
194
195 /* Enable Temperature, period is ~2s */
196 WRITE(sc, TP_TPR, TP_TPR_TEMP_EN | TP_TPR_TEMP_PERIOD(1953));
197
198 /* Enable temp irq */
199 WRITE(sc, TP_FIFOC, TP_FIFOC_TEMP_IRQ_ENABLE);
200
201 /* Add sysctl */
202 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
203 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
204 OID_AUTO, "temperature",
205 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
206 &sc->temp_data, 0, sysctl_handle_int,
207 "IK3", "CPU Temperature");
208
209 return (0);
210 }
211
212 static device_method_t aw_ts_methods[] = {
213 DEVMETHOD(device_probe, aw_ts_probe),
214 DEVMETHOD(device_attach, aw_ts_attach),
215
216 DEVMETHOD_END
217 };
218
219 static driver_t aw_ts_driver = {
220 "aw_ts",
221 aw_ts_methods,
222 sizeof(struct aw_ts_softc),
223 };
224
225 DRIVER_MODULE(aw_ts, simplebus, aw_ts_driver, 0, 0);
226