1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2013-2014 Ruslan Bukin <br@bsdpad.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * Vybrid Family Input/Output Multiplexer Controller (IOMUXC)
31 * Chapter 5, Vybrid Reference Manual, Rev. 5, 07/2013
32 */
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/malloc.h>
40 #include <sys/rman.h>
41 #include <sys/timeet.h>
42 #include <sys/timetc.h>
43 #include <sys/watchdog.h>
44
45 #include <dev/fdt/fdt_common.h>
46 #include <dev/ofw/openfirm.h>
47 #include <dev/ofw/ofw_bus.h>
48 #include <dev/ofw/ofw_bus_subr.h>
49
50 #include <machine/bus.h>
51 #include <machine/cpu.h>
52 #include <machine/intr.h>
53
54 #include <arm/freescale/vybrid/vf_iomuxc.h>
55 #include <arm/freescale/vybrid/vf_common.h>
56
57 #define MUX_MODE_MASK 7
58 #define MUX_MODE_SHIFT 20
59 #define MUX_MODE_GPIO 0
60 #define MUX_MODE_VBUS_EN_OTG 2
61
62 #define IBE (1 << 0) /* Input Buffer Enable Field */
63 #define OBE (1 << 1) /* Output Buffer Enable Field. */
64 #define PUE (1 << 2) /* Pull / Keep Select Field. */
65 #define PKE (1 << 3) /* Pull / Keep Enable Field. */
66 #define HYS (1 << 9) /* Hysteresis Enable Field */
67 #define ODE (1 << 10) /* Open Drain Enable Field. */
68 #define SRE (1 << 11) /* Slew Rate Field. */
69
70 #define SPEED_SHIFT 12
71 #define SPEED_MASK 0x3
72 #define SPEED_LOW 0 /* 50 MHz */
73 #define SPEED_MEDIUM 0x1 /* 100 MHz */
74 #define SPEED_HIGH 0x3 /* 200 MHz */
75
76 #define PUS_SHIFT 4 /* Pull Up / Down Config Field Shift */
77 #define PUS_MASK 0x3
78 #define PUS_100_KOHM_PULL_DOWN 0
79 #define PUS_47_KOHM_PULL_UP 0x1
80 #define PUS_100_KOHM_PULL_UP 0x2
81 #define PUS_22_KOHM_PULL_UP 0x3
82
83 #define DSE_SHIFT 6 /* Drive Strength Field Shift */
84 #define DSE_MASK 0x7
85 #define DSE_DISABLED 0 /* Output driver disabled */
86 #define DSE_150_OHM 0x1
87 #define DSE_75_OHM 0x2
88 #define DSE_50_OHM 0x3
89 #define DSE_37_OHM 0x4
90 #define DSE_30_OHM 0x5
91 #define DSE_25_OHM 0x6
92 #define DSE_20_OHM 0x7
93
94 #define MAX_MUX_LEN 1024
95
96 struct iomuxc_softc {
97 struct resource *tmr_res[1];
98 bus_space_tag_t bst;
99 bus_space_handle_t bsh;
100 device_t dev;
101 };
102
103 static struct resource_spec iomuxc_spec[] = {
104 { SYS_RES_MEMORY, 0, RF_ACTIVE },
105 { -1, 0 }
106 };
107
108 static int
iomuxc_probe(device_t dev)109 iomuxc_probe(device_t dev)
110 {
111
112 if (!ofw_bus_status_okay(dev))
113 return (ENXIO);
114
115 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc"))
116 return (ENXIO);
117
118 device_set_desc(dev, "Vybrid Family IOMUXC Unit");
119 return (BUS_PROBE_DEFAULT);
120 }
121
122 static int
pinmux_set(struct iomuxc_softc * sc)123 pinmux_set(struct iomuxc_softc *sc)
124 {
125 phandle_t child, parent, root;
126 pcell_t iomux_config[MAX_MUX_LEN];
127 int len;
128 int values;
129 int pin;
130 int pin_cfg;
131 int i;
132
133 root = OF_finddevice("/");
134 len = 0;
135 parent = root;
136
137 /* Find 'iomux_config' prop in the nodes */
138 for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
139 /* Find a 'leaf'. Start the search from this node. */
140 while (OF_child(child)) {
141 parent = child;
142 child = OF_child(child);
143 }
144
145 if (!ofw_bus_node_status_okay(child))
146 continue;
147
148 if ((len = OF_getproplen(child, "iomux_config")) > 0) {
149 OF_getencprop(child, "iomux_config", iomux_config, len);
150
151 values = len / (sizeof(uint32_t));
152 for (i = 0; i < values; i += 2) {
153 pin = iomux_config[i];
154 pin_cfg = iomux_config[i+1];
155 #if 0
156 device_printf(sc->dev, "Set pin %d to 0x%08x\n",
157 pin, pin_cfg);
158 #endif
159 WRITE4(sc, IOMUXC(pin), pin_cfg);
160 }
161 }
162
163 if (OF_peer(child) == 0) {
164 /* No more siblings. */
165 child = parent;
166 parent = OF_parent(child);
167 }
168 }
169
170 return (0);
171 }
172
173 static int
iomuxc_attach(device_t dev)174 iomuxc_attach(device_t dev)
175 {
176 struct iomuxc_softc *sc;
177
178 sc = device_get_softc(dev);
179 sc->dev = dev;
180
181 if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) {
182 device_printf(dev, "could not allocate resources\n");
183 return (ENXIO);
184 }
185
186 /* Memory interface */
187 sc->bst = rman_get_bustag(sc->tmr_res[0]);
188 sc->bsh = rman_get_bushandle(sc->tmr_res[0]);
189
190 pinmux_set(sc);
191
192 return (0);
193 }
194
195 static device_method_t iomuxc_methods[] = {
196 DEVMETHOD(device_probe, iomuxc_probe),
197 DEVMETHOD(device_attach, iomuxc_attach),
198 { 0, 0 }
199 };
200
201 static driver_t iomuxc_driver = {
202 "iomuxc",
203 iomuxc_methods,
204 sizeof(struct iomuxc_softc),
205 };
206
207 DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, 0, 0);
208