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
50 static int uart_fdt_probe(device_t);
51
52 static 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
60 static driver_t uart_fdt_driver = {
61 uart_driver_name,
62 uart_fdt_methods,
63 sizeof(struct uart_softc),
64 };
65
66 int
uart_fdt_get_clock(phandle_t node,pcell_t * cell)67 uart_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
83 int
uart_fdt_get_shift(phandle_t node,pcell_t * cell)84 uart_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
92 static uintptr_t
uart_fdt_find_device(device_t dev)93 uart_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
106 static int
uart_fdt_probe(device_t dev)107 uart_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
132 DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
133 DRIVER_MODULE(uart, ofwbus, uart_fdt_driver, uart_devclass, 0, 0);
134