2 * Copyright (c) 2009-2010 The FreeBSD Foundation
5 * This software was developed by Semihalf under sponsorship from
6 * the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include "opt_platform.h"
35 #include <sys/param.h>
36 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
41 #include <machine/bus.h>
43 #include <dev/fdt/fdt_common.h>
44 #include <dev/ofw/ofw_bus.h>
45 #include <dev/ofw/ofw_bus_subr.h>
46 #include <dev/uart/uart.h>
47 #include <dev/uart/uart_bus.h>
48 #include <dev/uart/uart_cpu.h>
49 #include <dev/uart/uart_cpu_fdt.h>
51 static int uart_fdt_probe(device_t);
53 static device_method_t uart_fdt_methods[] = {
54 /* Device interface */
55 DEVMETHOD(device_probe, uart_fdt_probe),
56 DEVMETHOD(device_attach, uart_bus_attach),
57 DEVMETHOD(device_detach, uart_bus_detach),
61 static driver_t uart_fdt_driver = {
64 sizeof(struct uart_softc),
68 uart_fdt_get_clock(phandle_t node, pcell_t *cell)
71 /* clock-frequency is a FreeBSD-only extension. */
72 if ((OF_getencprop(node, "clock-frequency", cell,
73 sizeof(*cell))) <= 0) {
74 /* Try to retrieve parent 'bus-frequency' */
75 /* XXX this should go to simple-bus fixup or so */
76 if ((OF_getencprop(OF_parent(node), "bus-frequency", cell,
85 uart_fdt_get_shift(phandle_t node, pcell_t *cell)
88 if ((OF_getencprop(node, "reg-shift", cell, sizeof(*cell))) <= 0)
94 uart_fdt_get_io_width(phandle_t node, pcell_t *cell)
97 if ((OF_getencprop(node, "reg-io-width", cell, sizeof(*cell))) <= 0)
103 uart_fdt_find_device(device_t dev)
105 struct ofw_compat_data **cd;
106 const struct ofw_compat_data *ocd;
108 SET_FOREACH(cd, uart_fdt_class_and_device_set) {
109 ocd = ofw_bus_search_compatible(dev, *cd);
110 if (ocd->ocd_data != 0)
111 return (ocd->ocd_data);
117 phandle_chosen_propdev(phandle_t chosen, const char *name, phandle_t *node)
122 if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0)
125 * stdout-path may have a ':' to separate the device from the
126 * connection settings. Split the string so we just pass the former
129 sep = strchr(buf, ':');
132 if ((*node = OF_finddevice(buf)) == -1)
138 static const struct ofw_compat_data *
139 uart_fdt_find_compatible(phandle_t node, const struct ofw_compat_data *cd)
141 const struct ofw_compat_data *ocd;
143 for (ocd = cd; ocd->ocd_str != NULL; ocd++) {
144 if (ofw_bus_node_is_compatible(node, ocd->ocd_str))
151 uart_fdt_find_by_node(phandle_t node, int class_list)
153 struct ofw_compat_data **cd;
154 const struct ofw_compat_data *ocd;
157 SET_FOREACH(cd, uart_fdt_class_set) {
158 ocd = uart_fdt_find_compatible(node, *cd);
159 if ((ocd != NULL) && (ocd->ocd_data != 0))
160 return (ocd->ocd_data);
163 SET_FOREACH(cd, uart_fdt_class_and_device_set) {
164 ocd = uart_fdt_find_compatible(node, *cd);
165 if ((ocd != NULL) && (ocd->ocd_data != 0))
166 return (ocd->ocd_data);
174 uart_cpu_fdt_probe(struct uart_class **classp, bus_space_tag_t *bst,
175 bus_space_handle_t *bsh, int *baud, u_int *rclk, u_int *shiftp,
178 const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout",
179 "stdin-path", "stdin", NULL};
181 struct uart_class *class;
182 phandle_t node, chosen;
183 pcell_t br, clk, shift, iowidth;
187 /* Has the user forced a specific device node? */
188 cp = kern_getenv("hw.fdt.console");
191 * Retrieve /chosen/std{in,out}.
194 if ((chosen = OF_finddevice("/chosen")) != -1) {
195 for (name = propnames; *name != NULL; name++) {
196 if (phandle_chosen_propdev(chosen, *name,
201 if (chosen == -1 || *name == NULL)
202 node = OF_finddevice("serial0"); /* Last ditch */
204 node = OF_finddevice(cp);
211 * Check old style of UART definition first. Unfortunately, the common
212 * FDT processing is not possible if we have clock, power domains and
215 class = (struct uart_class *)uart_fdt_find_by_node(node, 0);
217 if ((err = uart_fdt_get_clock(node, &clk)) != 0)
220 /* Check class only linker set */
222 (struct uart_class *)uart_fdt_find_by_node(node, 1);
229 * Retrieve serial attributes.
231 if (uart_fdt_get_shift(node, &shift) != 0)
232 shift = uart_getregshift(class);
234 if (uart_fdt_get_io_width(node, &iowidth) != 0)
235 iowidth = uart_getregiowidth(class);
237 if (OF_getencprop(node, "current-speed", &br, sizeof(br)) <= 0)
240 err = OF_decode_addr(node, 0, bst, bsh, NULL);
254 uart_fdt_probe(device_t dev)
256 struct uart_softc *sc;
258 pcell_t clock, shift, iowidth;
261 sc = device_get_softc(dev);
263 if (!ofw_bus_status_okay(dev))
266 sc->sc_class = (struct uart_class *)uart_fdt_find_device(dev);
267 if (sc->sc_class == NULL)
270 node = ofw_bus_get_node(dev);
272 if ((err = uart_fdt_get_clock(node, &clock)) != 0)
274 if (uart_fdt_get_shift(node, &shift) != 0)
275 shift = uart_getregshift(sc->sc_class);
276 if (uart_fdt_get_io_width(node, &iowidth) != 0)
277 iowidth = uart_getregiowidth(sc->sc_class);
279 return (uart_bus_probe(dev, (int)shift, (int)iowidth, (int)clock, 0, 0));
282 DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
283 DRIVER_MODULE(uart, ofwbus, uart_fdt_driver, uart_devclass, 0, 0);