xref: /freebsd/sys/arm/freescale/vybrid/vf_iomuxc.c (revision 4ec234c813eed05c166859bba82c882e40826eb9)
1 /*-
2  * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
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 /*
28  * Vybrid Family Input/Output Multiplexer Controller (IOMUXC)
29  * Chapter 5, Vybrid Reference Manual, Rev. 5, 07/2013
30  */
31 
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34 
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/bus.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/malloc.h>
41 #include <sys/rman.h>
42 #include <sys/timeet.h>
43 #include <sys/timetc.h>
44 #include <sys/watchdog.h>
45 
46 #include <dev/fdt/fdt_common.h>
47 #include <dev/ofw/openfirm.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
50 
51 #include <machine/bus.h>
52 #include <machine/fdt.h>
53 #include <machine/cpu.h>
54 #include <machine/intr.h>
55 
56 #include <arm/freescale/vybrid/vf_iomuxc.h>
57 #include <arm/freescale/vybrid/vf_common.h>
58 
59 #define	IBE		(1 << 0) /* Input Buffer Enable Field */
60 #define	OBE		(1 << 1) /* Output Buffer Enable Field. */
61 #define	PUE		(1 << 2) /* Pull / Keep Select Field. */
62 #define	PKE		(1 << 3) /* Pull / Keep Enable Field. */
63 #define	PUS_MASK	(3 << 4) /* Pull Up / Down Config Field. */
64 #define	DSE_MASK	(7 << 6) /* Drive Strength Field. */
65 #define	HYS		(1 << 9) /* Hysteresis Enable Field */
66 
67 #define	MUX_MODE_MASK		7
68 #define	MUX_MODE_SHIFT		20
69 #define	MUX_MODE_GPIO		0
70 #define	MUX_MODE_RMII		1
71 #define	MUX_MODE_RMII_CLKIN	2
72 #define	MUX_MODE_VBUS_EN_OTG	2
73 
74 #define	PUS_22_KOHM_PULL_UP	(3 << 4)
75 #define	DSE_25_OHM		(6 << 6)
76 
77 #define	NET0_PAD_START	45
78 #define	NET1_PAD_START	54
79 #define	NET_PAD_N	9
80 
81 struct iomuxc_softc {
82 	struct resource		*tmr_res[1];
83 	bus_space_tag_t		bst;
84 	bus_space_handle_t	bsh;
85 	device_t		dev;
86 };
87 
88 static struct resource_spec iomuxc_spec[] = {
89 	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
90 	{ -1, 0 }
91 };
92 
93 static int
94 iomuxc_probe(device_t dev)
95 {
96 
97 	if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc"))
98 		return (ENXIO);
99 
100 	device_set_desc(dev, "Vybrid Family IOMUXC Unit");
101 	return (BUS_PROBE_DEFAULT);
102 }
103 
104 static int
105 configure_pad(struct iomuxc_softc *sc, int pad, int mux_mode)
106 {
107 	int reg;
108 
109 	reg = READ4(sc, pad);
110 	reg &= ~(MUX_MODE_MASK << MUX_MODE_SHIFT);
111 	reg |= (mux_mode << MUX_MODE_SHIFT);
112 	WRITE4(sc, pad, reg);
113 
114 	return (0);
115 }
116 
117 static int
118 iomuxc_attach(device_t dev)
119 {
120 	struct iomuxc_softc *sc;
121 	int reg;
122 	int i;
123 
124 	sc = device_get_softc(dev);
125 	sc->dev = dev;
126 
127 	if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) {
128 		device_printf(dev, "could not allocate resources\n");
129 		return (ENXIO);
130 	}
131 
132 	/* Memory interface */
133 	sc->bst = rman_get_bustag(sc->tmr_res[0]);
134 	sc->bsh = rman_get_bushandle(sc->tmr_res[0]);
135 
136 	/* USB */
137 	configure_pad(sc, IOMUXC_PTA17, MUX_MODE_VBUS_EN_OTG);
138 	reg = (PKE | PUE | PUS_22_KOHM_PULL_UP | DSE_25_OHM | OBE);
139 	WRITE4(sc, IOMUXC_PTA7, reg);
140 
141 	/* NET */
142 	configure_pad(sc, IOMUXC_PTA6, MUX_MODE_RMII_CLKIN);
143 
144 	/* NET0 */
145 	for (i = NET0_PAD_START; i <= (NET0_PAD_START + NET_PAD_N); i++) {
146 		configure_pad(sc, IOMUXC(i), MUX_MODE_RMII);
147 	}
148 
149 	/* NET1 */
150 	for (i = NET1_PAD_START; i <= (NET1_PAD_START + NET_PAD_N); i++) {
151 		configure_pad(sc, IOMUXC(i), MUX_MODE_RMII);
152 	}
153 
154 	return (0);
155 }
156 
157 static device_method_t iomuxc_methods[] = {
158 	DEVMETHOD(device_probe,		iomuxc_probe),
159 	DEVMETHOD(device_attach,	iomuxc_attach),
160 	{ 0, 0 }
161 };
162 
163 static driver_t iomuxc_driver = {
164 	"iomuxc",
165 	iomuxc_methods,
166 	sizeof(struct iomuxc_softc),
167 };
168 
169 static devclass_t iomuxc_devclass;
170 
171 DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, iomuxc_devclass, 0, 0);
172