vf_iomuxc.c revision 266152 
1/*-
2 * Copyright (c) 2013-2014 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: stable/10/sys/arm/freescale/vybrid/vf_iomuxc.c 266152 2014-05-15 16:11:06Z ian $");
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_VBUS_EN_OTG	2
71
72#define	PUS_22_KOHM_PULL_UP	(3 << 4)
73#define	DSE_25_OHM		(6 << 6)
74
75#define	MAX_MUX_LEN		1024
76
77struct iomuxc_softc {
78	struct resource		*tmr_res[1];
79	bus_space_tag_t		bst;
80	bus_space_handle_t	bsh;
81	device_t		dev;
82};
83
84static struct resource_spec iomuxc_spec[] = {
85	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
86	{ -1, 0 }
87};
88
89static int
90iomuxc_probe(device_t dev)
91{
92
93	if (!ofw_bus_status_okay(dev))
94		return (ENXIO);
95
96	if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc"))
97		return (ENXIO);
98
99	device_set_desc(dev, "Vybrid Family IOMUXC Unit");
100	return (BUS_PROBE_DEFAULT);
101}
102
103static int
104configure_pad(struct iomuxc_softc *sc, int pad, int mux_mode)
105{
106	int reg;
107
108	reg = READ4(sc, pad);
109	reg &= ~(MUX_MODE_MASK << MUX_MODE_SHIFT);
110	reg |= (mux_mode << MUX_MODE_SHIFT);
111	WRITE4(sc, pad, reg);
112
113	return (0);
114}
115
116static int
117pinmux_set(struct iomuxc_softc *sc)
118{
119	phandle_t child, parent, root;
120	pcell_t iomux_config[MAX_MUX_LEN];
121	int len;
122	int values;
123	int pin;
124	int mux_mode;
125	int i;
126
127	root = OF_finddevice("/");
128	len = 0;
129	parent = root;
130
131	/* Find 'iomux_config' prop in the nodes */
132	for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
133
134		/* Find a 'leaf'. Start the search from this node. */
135		while (OF_child(child)) {
136			parent = child;
137			child = OF_child(child);
138		}
139
140		if (!fdt_is_enabled(child))
141			continue;
142
143		if ((len = OF_getproplen(child, "iomux_config")) > 0) {
144			OF_getprop(child, "iomux_config", &iomux_config, len);
145
146			values = len / (sizeof(uint32_t));
147			for (i = 0; i < values; i += 2) {
148				pin = fdt32_to_cpu(iomux_config[i]);
149				mux_mode = fdt32_to_cpu(iomux_config[i+1]);
150#if 0
151				device_printf(sc->dev, "Set pin %d to ALT%d\n",
152				    pin, mux_mode);
153#endif
154				configure_pad(sc, IOMUXC(pin), mux_mode);
155			}
156		}
157
158		if (OF_peer(child) == 0) {
159			/* No more siblings. */
160			child = parent;
161			parent = OF_parent(child);
162		}
163	}
164
165	return (0);
166}
167
168static int
169iomuxc_attach(device_t dev)
170{
171	struct iomuxc_softc *sc;
172	int reg;
173
174	sc = device_get_softc(dev);
175	sc->dev = dev;
176
177	if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) {
178		device_printf(dev, "could not allocate resources\n");
179		return (ENXIO);
180	}
181
182	/* Memory interface */
183	sc->bst = rman_get_bustag(sc->tmr_res[0]);
184	sc->bsh = rman_get_bushandle(sc->tmr_res[0]);
185
186	/* USB */
187	configure_pad(sc, IOMUXC_PTA17, MUX_MODE_VBUS_EN_OTG);
188	reg = (PKE | PUE | PUS_22_KOHM_PULL_UP | DSE_25_OHM | OBE);
189	WRITE4(sc, IOMUXC_PTA7, reg);
190
191	pinmux_set(sc);
192
193	return (0);
194}
195
196static device_method_t iomuxc_methods[] = {
197	DEVMETHOD(device_probe,		iomuxc_probe),
198	DEVMETHOD(device_attach,	iomuxc_attach),
199	{ 0, 0 }
200};
201
202static driver_t iomuxc_driver = {
203	"iomuxc",
204	iomuxc_methods,
205	sizeof(struct iomuxc_softc),
206};
207
208static devclass_t iomuxc_devclass;
209
210DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, iomuxc_devclass, 0, 0);
211