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>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/systm.h>
44 #include <machine/bus.h>
46 #include <dev/fdt/fdt_common.h>
47 #include <dev/ofw/ofw_bus.h>
48 #include <dev/ofw/ofw_bus_subr.h>
49 #include <dev/uart/uart.h>
50 #include <dev/uart/uart_bus.h>
51 #include <dev/uart/uart_cpu.h>
52 #include <dev/uart/uart_cpu_fdt.h>
55 * UART console routines.
57 bus_space_tag_t uart_bus_space_io;
58 bus_space_tag_t uart_bus_space_mem;
61 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
64 if (b1->bst != b2->bst)
66 if (pmap_kextract(b1->bsh) == 0)
68 if (pmap_kextract(b2->bsh) == 0)
70 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
74 phandle_chosen_propdev(phandle_t chosen, const char *name, phandle_t *node)
78 if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0)
80 if ((*node = OF_finddevice(buf)) == -1)
86 static const struct ofw_compat_data *
87 uart_fdt_find_compatible(phandle_t node, const struct ofw_compat_data *cd)
89 const struct ofw_compat_data *ocd;
91 for (ocd = cd; ocd->ocd_str != NULL; ocd++) {
92 if (fdt_is_compatible(node, ocd->ocd_str))
99 uart_fdt_find_by_node(phandle_t node, int class_list)
101 struct ofw_compat_data **cd;
102 const struct ofw_compat_data *ocd;
105 SET_FOREACH(cd, uart_fdt_class_set) {
106 ocd = uart_fdt_find_compatible(node, *cd);
107 if ((ocd != NULL) && (ocd->ocd_data != 0))
108 return (ocd->ocd_data);
111 SET_FOREACH(cd, uart_fdt_class_and_device_set) {
112 ocd = uart_fdt_find_compatible(node, *cd);
113 if ((ocd != NULL) && (ocd->ocd_data != 0))
114 return (ocd->ocd_data);
121 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
123 const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout",
124 "stdin-path", "stdin", NULL};
126 struct uart_class *class;
127 phandle_t node, chosen;
128 pcell_t shift, br, rclk;
132 /* Allow overriding the FDT using the environment. */
133 class = &uart_ns8250_class;
134 err = uart_getenv(devtype, di, class);
138 if (devtype != UART_DEV_CONSOLE)
141 /* Has the user forced a specific device node? */
142 cp = kern_getenv("hw.fdt.console");
145 * Retrieve /chosen/std{in,out}.
148 if ((chosen = OF_finddevice("/chosen")) != -1) {
149 for (name = propnames; *name != NULL; name++) {
150 if (phandle_chosen_propdev(chosen, *name,
155 if (chosen == -1 || *name == NULL)
156 node = OF_finddevice("serial0"); /* Last ditch */
158 node = OF_finddevice(cp);
161 if (node == -1) /* Can't find anything */
165 * Check old style of UART definition first. Unfortunately, the common
166 * FDT processing is not possible if we have clock, power domains and
169 class = (struct uart_class *)uart_fdt_find_by_node(node, 0);
171 if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
174 /* Check class only linker set */
176 (struct uart_class *)uart_fdt_find_by_node(node, 1);
183 * Retrieve serial attributes.
185 if (uart_fdt_get_shift(node, &shift) != 0)
186 shift = uart_getregshift(class);
188 if (OF_getencprop(node, "current-speed", &br, sizeof(br)) <= 0)
192 * Finalize configuration.
195 di->bas.regshft = (u_int)shift;
197 di->bas.rclk = (u_int)rclk;
198 di->ops = uart_getops(class);
201 di->parity = UART_PARITY_NONE;
203 err = OF_decode_addr(node, 0, &di->bas.bst, &di->bas.bsh, NULL);
204 uart_bus_space_mem = di->bas.bst;
205 uart_bus_space_io = NULL;