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>
45 #include <machine/fdt.h>
47 #include <dev/fdt/fdt_common.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
50 #include <dev/uart/uart.h>
51 #include <dev/uart/uart_bus.h>
52 #include <dev/uart/uart_cpu.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_fdt_get_clock(phandle_t node, pcell_t *cell)
65 if ((OF_getprop(node, "clock-frequency", &clock,
70 /* Try to retrieve parent 'bus-frequency' */
71 /* XXX this should go to simple-bus fixup or so */
72 if ((OF_getprop(OF_parent(node), "bus-frequency", &clock,
76 *cell = fdt32_to_cpu(clock);
81 uart_fdt_get_shift(phandle_t node, pcell_t *cell)
85 if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0)
87 *cell = fdt32_to_cpu(shift);
92 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
95 if (b1->bst != b2->bst)
97 if (pmap_kextract(b1->bsh) == 0)
99 if (pmap_kextract(b2->bsh) == 0)
101 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
105 phandle_chosen_propdev(phandle_t chosen, const char *name, phandle_t *node)
109 if (OF_getprop(chosen, name, buf, sizeof(buf)) <= 0)
111 if ((*node = OF_finddevice(buf)) == -1)
118 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
120 const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout",
121 "stdin-path", "stdin", NULL};
123 const struct ofw_compat_data *cd;
124 struct uart_class *class;
125 phandle_t node, chosen;
126 pcell_t shift, br, rclk;
127 u_long start, size, pbase, psize;
130 uart_bus_space_mem = fdtbus_bs_tag;
131 uart_bus_space_io = NULL;
133 /* Allow overriding the FDT using the environment. */
134 class = &uart_ns8250_class;
135 err = uart_getenv(devtype, di, class);
139 if (devtype != UART_DEV_CONSOLE)
143 * Retrieve /chosen/std{in,out}.
146 if ((chosen = OF_finddevice("/chosen")) != -1) {
147 for (name = propnames; *name != NULL; name++) {
148 if (phandle_chosen_propdev(chosen, *name, &node) == 0)
152 if (chosen == -1 || *name == NULL)
153 node = OF_finddevice("serial0"); /* Last ditch */
155 if (node == -1) /* Can't find anything */
159 * Retrieve serial attributes.
161 uart_fdt_get_shift(node, &shift);
163 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0)
165 br = fdt32_to_cpu(br);
167 if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
170 * Finalize configuration.
172 for (cd = uart_fdt_compat_data; cd->ocd_str != NULL; ++cd) {
173 if (fdt_is_compatible(node, cd->ocd_str))
176 if (cd->ocd_str == NULL)
178 class = (struct uart_class *)cd->ocd_data;
181 di->bas.regshft = (u_int)shift;
183 di->bas.rclk = (u_int)rclk;
184 di->ops = uart_getops(class);
187 di->parity = UART_PARITY_NONE;
188 di->bas.bst = uart_bus_space_mem;
190 err = fdt_regsize(node, &start, &size);
193 err = fdt_get_range(OF_parent(node), 0, &pbase, &psize);
199 return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh));