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 <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
38 #include <machine/bus.h>
39 #include <machine/fdt.h>
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>
48 static int uart_fdt_probe(device_t);
50 static 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),
58 static driver_t uart_fdt_driver = {
61 sizeof(struct uart_softc),
65 uart_fdt_get_clock(phandle_t node, pcell_t *cell)
69 if ((OF_getprop(node, "clock-frequency", &clock,
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,
80 *cell = fdt32_to_cpu(clock);
85 uart_fdt_get_shift(phandle_t node, pcell_t *cell)
89 if ((OF_getprop(node, "reg-shift", &shift, sizeof(shift))) <= 0)
91 *cell = fdt32_to_cpu(shift);
96 uart_fdt_probe(device_t dev)
98 struct uart_softc *sc;
100 pcell_t clock, shift;
103 if (!ofw_bus_is_compatible(dev, "ns16550"))
106 sc = device_get_softc(dev);
107 sc->sc_class = &uart_ns8250_class;
109 node = ofw_bus_get_node(dev);
111 if ((err = uart_fdt_get_clock(node, &clock)) != 0)
113 uart_fdt_get_shift(node, &shift);
115 return (uart_bus_probe(dev, (int)shift, (int)clock, 0, 0));
118 DRIVER_MODULE(uart, simplebus, uart_fdt_driver, uart_devclass, 0, 0);
121 * UART console routines.
123 bus_space_tag_t uart_bus_space_io;
124 bus_space_tag_t uart_bus_space_mem;
127 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
130 return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
134 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
137 struct uart_class *class;
138 phandle_t node, chosen;
139 pcell_t shift, br, rclk;
143 uart_bus_space_mem = fdtbus_bs_tag;
144 uart_bus_space_io = NULL;
146 /* Allow overriding the FDT uning the environment. */
147 class = &uart_ns8250_class;
148 err = uart_getenv(devtype, di, class);
152 if (devtype != UART_DEV_CONSOLE)
156 * Retrieve /chosen/std{in,out}.
158 if ((chosen = OF_finddevice("/chosen")) == 0)
160 if (OF_getprop(chosen, "stdin", buf, sizeof(buf)) <= 0)
162 if ((node = OF_finddevice(buf)) == 0)
164 if (OF_getprop(chosen, "stdout", buf, sizeof(buf)) <= 0)
166 if (OF_finddevice(buf) != node)
167 /* Only stdin == stdout is supported. */
170 * Retrieve serial attributes.
172 uart_fdt_get_shift(node, &shift);
174 if (OF_getprop(node, "current-speed", &br, sizeof(br)) <= 0)
176 br = fdt32_to_cpu(br);
178 if ((err = uart_fdt_get_clock(node, &rclk)) != 0)
181 * Finalize configuration.
183 class = &uart_quicc_class;
184 if (fdt_is_compatible(node, "ns16550"))
185 class = &uart_ns8250_class;
188 di->bas.regshft = (u_int)shift;
190 di->bas.rclk = (u_int)rclk;
191 di->ops = uart_getops(class);
194 di->parity = UART_PARITY_NONE;
195 di->bas.bst = uart_bus_space_mem;
197 err = fdt_regsize(node, &start, &size);
200 start += fdt_immr_va;
202 return (bus_space_map(di->bas.bst, start, size, 0, &di->bas.bsh));