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 <sys/param.h>
34#include <sys/bus.h>
35#include <sys/kernel.h>
36#include <sys/module.h>
37
38#include <machine/bus.h>
39#include <machine/fdt.h>
40
41#include <dev/fdt/fdt_common.h>
42#include <dev/ofw/ofw_bus.h>
43#include <dev/ofw/ofw_bus_subr.h>
44#include <dev/uart/uart.h>
45#include <dev/uart/uart_bus.h>
46#include <dev/uart/uart_cpu.h>
47
48static int uart_fdt_probe(device_t);
49
50static device_method_t uart_fdt_methods[] = {
51	/* Device interface */
52	DEVMETHOD(device_probe,		uart_fdt_probe),
53	DEVMETHOD(device_attach,	uart_bus_attach),
54	DEVMETHOD(device_detach,	uart_bus_detach),
55	{ 0, 0 }
56};
57
58static driver_t uart_fdt_driver = {
59	uart_driver_name,
60	uart_fdt_methods,
61	sizeof(struct uart_softc),
62};
63
64static int
65uart_fdt_get_clock(phandle_t node, pcell_t *cell)
66{
67	pcell_t clock;
68
69	if ((OF_getprop(node, "clock-frequency", &clock,
70	    sizeof(clock))) <= 0)
71		return (ENXIO);
72
73	if (clock == 0)
74		/* Try to retrieve parent 'bus-frequency' */
75		/* XXX this should go to simple-bus fixup or so */
76		if ((OF_getprop(OF_parent(node), "bus-frequency", &clock,
77		    sizeof(clock))) <= 0)
78			clock = 0;
79
80	*cell = fdt32_to_cpu(clock);
81	return (0);
82}
83
84static int
85uart_fdt_get_shift(phandle_t node, pcell_t *cell)
86{
87	pcell_t shift;
88
89	if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0)
90		shift = 0;
91	*cell = fdt32_to_cpu(shift);
92	return (0);
93}
94
95static int
96uart_fdt_probe(device_t dev)
97{
98	struct uart_softc *sc;
99	phandle_t node;
100	pcell_t clock, shift;
101	int err;
102
103	sc = device_get_softc(dev);
104	if (ofw_bus_is_compatible(dev, "lpc,uart"))
105		sc->sc_class = &uart_lpc_class;
106	else if (ofw_bus_is_compatible(dev, "fsl,imx-uart"))
107		sc->sc_class = &uart_imx_class;
108	else if (ofw_bus_is_compatible(dev, "arm,pl011"))
109		sc->sc_class = &uart_pl011_class;
110	else if (ofw_bus_is_compatible(dev, "exynos"))
111		sc->sc_class = &uart_s3c2410_class;
112	else if (ofw_bus_is_compatible(dev, "cadence,uart"))
113		sc->sc_class = &uart_cdnc_class;
114	else if (ofw_bus_is_compatible(dev, "ti,ns16550"))
115		sc->sc_class = &uart_ti8250_class;
116	else if (ofw_bus_is_compatible(dev, "ns16550"))
117		sc->sc_class = &uart_ns8250_class;
118	else
119		return (ENXIO);
120
121	node = ofw_bus_get_node(dev);
122
123	if ((err = uart_fdt_get_clock(node, &clock)) != 0)
124		return (err);
125	uart_fdt_get_shift(node, &shift);
126
127	return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0));
128}
129
130DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
131