vf_iomuxc.c revision 266203 
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 266203 2014-05-16 00:14:50Z 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	MUX_MODE_MASK		7
60#define	MUX_MODE_SHIFT		20
61#define	MUX_MODE_GPIO		0
62#define	MUX_MODE_VBUS_EN_OTG	2
63
64#define	IBE		(1 << 0)	/* Input Buffer Enable Field */
65#define	OBE		(1 << 1)	/* Output Buffer Enable Field. */
66#define	PUE		(1 << 2)	/* Pull / Keep Select Field. */
67#define	PKE		(1 << 3)	/* Pull / Keep Enable Field. */
68#define	HYS		(1 << 9)	/* Hysteresis Enable Field */
69#define	ODE		(1 << 10)	/* Open Drain Enable Field. */
70#define	SRE		(1 << 11)	/* Slew Rate Field. */
71
72#define	SPEED_SHIFT		12
73#define	SPEED_MASK		0x3
74#define	SPEED_LOW		0	/* 50 MHz */
75#define	SPEED_MEDIUM		0x1	/* 100 MHz */
76#define	SPEED_HIGH		0x3	/* 200 MHz */
77
78#define	PUS_SHIFT		4	/* Pull Up / Down Config Field Shift */
79#define	PUS_MASK		0x3
80#define	PUS_100_KOHM_PULL_DOWN	0
81#define	PUS_47_KOHM_PULL_UP	0x1
82#define	PUS_100_KOHM_PULL_UP	0x2
83#define	PUS_22_KOHM_PULL_UP	0x3
84
85#define	DSE_SHIFT		6	/* Drive Strength Field Shift */
86#define	DSE_MASK		0x7
87#define	DSE_DISABLED		0	/* Output driver disabled */
88#define	DSE_150_OHM		0x1
89#define	DSE_75_OHM		0x2
90#define	DSE_50_OHM		0x3
91#define	DSE_37_OHM		0x4
92#define	DSE_30_OHM		0x5
93#define	DSE_25_OHM		0x6
94#define	DSE_20_OHM		0x7
95
96#define	MAX_MUX_LEN		1024
97
98struct iomuxc_softc {
99	struct resource		*tmr_res[1];
100	bus_space_tag_t		bst;
101	bus_space_handle_t	bsh;
102	device_t		dev;
103};
104
105static struct resource_spec iomuxc_spec[] = {
106	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
107	{ -1, 0 }
108};
109
110static int
111iomuxc_probe(device_t dev)
112{
113
114	if (!ofw_bus_status_okay(dev))
115		return (ENXIO);
116
117	if (!ofw_bus_is_compatible(dev, "fsl,mvf600-iomuxc"))
118		return (ENXIO);
119
120	device_set_desc(dev, "Vybrid Family IOMUXC Unit");
121	return (BUS_PROBE_DEFAULT);
122}
123
124static int
125pinmux_set(struct iomuxc_softc *sc)
126{
127	phandle_t child, parent, root;
128	pcell_t iomux_config[MAX_MUX_LEN];
129	int len;
130	int values;
131	int pin;
132	int pin_cfg;
133	int i;
134
135	root = OF_finddevice("/");
136	len = 0;
137	parent = root;
138
139	/* Find 'iomux_config' prop in the nodes */
140	for (child = OF_child(parent); child != 0; child = OF_peer(child)) {
141
142		/* Find a 'leaf'. Start the search from this node. */
143		while (OF_child(child)) {
144			parent = child;
145			child = OF_child(child);
146		}
147
148		if (!fdt_is_enabled(child))
149			continue;
150
151		if ((len = OF_getproplen(child, "iomux_config")) > 0) {
152			OF_getprop(child, "iomux_config", &iomux_config, len);
153
154			values = len / (sizeof(uint32_t));
155			for (i = 0; i < values; i += 2) {
156				pin = fdt32_to_cpu(iomux_config[i]);
157				pin_cfg = fdt32_to_cpu(iomux_config[i+1]);
158#if 0
159				device_printf(sc->dev, "Set pin %d to 0x%08x\n",
160				    pin, pin_cfg);
161#endif
162				WRITE4(sc, IOMUXC(pin), pin_cfg);
163			}
164		}
165
166		if (OF_peer(child) == 0) {
167			/* No more siblings. */
168			child = parent;
169			parent = OF_parent(child);
170		}
171	}
172
173	return (0);
174}
175
176static int
177iomuxc_attach(device_t dev)
178{
179	struct iomuxc_softc *sc;
180
181	sc = device_get_softc(dev);
182	sc->dev = dev;
183
184	if (bus_alloc_resources(dev, iomuxc_spec, sc->tmr_res)) {
185		device_printf(dev, "could not allocate resources\n");
186		return (ENXIO);
187	}
188
189	/* Memory interface */
190	sc->bst = rman_get_bustag(sc->tmr_res[0]);
191	sc->bsh = rman_get_bushandle(sc->tmr_res[0]);
192
193	pinmux_set(sc);
194
195	return (0);
196}
197
198static device_method_t iomuxc_methods[] = {
199	DEVMETHOD(device_probe,		iomuxc_probe),
200	DEVMETHOD(device_attach,	iomuxc_attach),
201	{ 0, 0 }
202};
203
204static driver_t iomuxc_driver = {
205	"iomuxc",
206	iomuxc_methods,
207	sizeof(struct iomuxc_softc),
208};
209
210static devclass_t iomuxc_devclass;
211
212DRIVER_MODULE(iomuxc, simplebus, iomuxc_driver, iomuxc_devclass, 0, 0);
213