1/*-
2 * Copyright (c) 2009-2010 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Semihalf under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include "opt_platform.h"
34
35#include <sys/param.h>
36#include <sys/bus.h>
37#include <sys/kernel.h>
38#include <sys/module.h>
39
40#include <machine/bus.h>
41
42#include <dev/fdt/fdt_common.h>
43#include <dev/ofw/ofw_bus.h>
44#include <dev/ofw/ofw_bus_subr.h>
45#include <dev/uart/uart.h>
46#include <dev/uart/uart_bus.h>
47#include <dev/uart/uart_cpu.h>
48#include <dev/uart/uart_cpu_fdt.h>
49
50static int uart_fdt_probe(device_t);
51
52static device_method_t uart_fdt_methods[] = {
53	/* Device interface */
54	DEVMETHOD(device_probe,		uart_fdt_probe),
55	DEVMETHOD(device_attach,	uart_bus_attach),
56	DEVMETHOD(device_detach,	uart_bus_detach),
57	{ 0, 0 }
58};
59
60static driver_t uart_fdt_driver = {
61	uart_driver_name,
62	uart_fdt_methods,
63	sizeof(struct uart_softc),
64};
65
66int
67uart_fdt_get_clock(phandle_t node, pcell_t *cell)
68{
69
70	/* clock-frequency is a FreeBSD-only extention. */
71	if ((OF_getencprop(node, "clock-frequency", cell,
72	    sizeof(*cell))) <= 0) {
73		/* Try to retrieve parent 'bus-frequency' */
74		/* XXX this should go to simple-bus fixup or so */
75		if ((OF_getencprop(OF_parent(node), "bus-frequency", cell,
76		    sizeof(*cell))) <= 0)
77			*cell = 0;
78	}
79
80	return (0);
81}
82
83int
84uart_fdt_get_shift(phandle_t node, pcell_t *cell)
85{
86
87	if ((OF_getencprop(node, "reg-shift", cell, sizeof(*cell))) <= 0)
88		*cell = 0;
89	return (0);
90}
91
92static uintptr_t
93uart_fdt_find_device(device_t dev)
94{
95	struct ofw_compat_data **cd;
96	const struct ofw_compat_data *ocd;
97
98	SET_FOREACH(cd, uart_fdt_class_and_device_set) {
99		ocd = ofw_bus_search_compatible(dev, *cd);
100		if (ocd->ocd_data != 0)
101			return (ocd->ocd_data);
102	}
103	return (0);
104}
105
106static int
107uart_fdt_probe(device_t dev)
108{
109	struct uart_softc *sc;
110	phandle_t node;
111	pcell_t clock, shift;
112	int err;
113
114	sc = device_get_softc(dev);
115
116	if (!ofw_bus_status_okay(dev))
117		return (ENXIO);
118
119	sc->sc_class = (struct uart_class *)uart_fdt_find_device(dev);
120	if (sc->sc_class == NULL)
121		return (ENXIO);
122
123	node = ofw_bus_get_node(dev);
124
125	if ((err = uart_fdt_get_clock(node, &clock)) != 0)
126		return (err);
127	uart_fdt_get_shift(node, &shift);
128
129	return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0));
130}
131
132DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
133DRIVER_MODULE(uart, ofwbus, uart_fdt_driver, uart_devclass, 0, 0);
134