1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2009-2010 The FreeBSD Foundation
5 * All rights reserved.
6 *
7 * This software was developed by Semihalf under sponsorship from
8 * the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include "opt_platform.h"
36
37 #include <sys/param.h>
38 #include <sys/bus.h>
39 #include <sys/kernel.h>
40 #include <sys/module.h>
41 #include <sys/systm.h>
42
43 #include <vm/vm.h>
44 #include <vm/pmap.h>
45
46 #include <machine/bus.h>
47
48 #include <dev/fdt/fdt_common.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <dev/ofw/ofw_bus_subr.h>
51 #include <dev/uart/uart.h>
52 #include <dev/uart/uart_bus.h>
53 #include <dev/uart/uart_cpu.h>
54 #include <dev/uart/uart_cpu_fdt.h>
55
56 /*
57 * UART console routines.
58 */
59 bus_space_tag_t uart_bus_space_io;
60 bus_space_tag_t uart_bus_space_mem;
61
62 int
uart_cpu_eqres(struct uart_bas * b1,struct uart_bas * b2)63 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
64 {
65
66 if (b1->bst != b2->bst)
67 return (0);
68 if (pmap_kextract(b1->bsh) == 0)
69 return (0);
70 if (pmap_kextract(b2->bsh) == 0)
71 return (0);
72 return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
73 }
74
75 int
uart_cpu_getdev(int devtype,struct uart_devinfo * di)76 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
77 {
78 struct uart_class *class;
79 bus_space_tag_t bst;
80 bus_space_handle_t bsh;
81 u_int shift, iowidth, rclk;
82 int br, err;
83
84 /* Allow overriding the FDT using the environment. */
85 class = &uart_ns8250_class;
86 err = uart_getenv(devtype, di, class);
87 if (!err)
88 return (0);
89
90 if (devtype != UART_DEV_CONSOLE)
91 return (ENXIO);
92
93 err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk, &shift, &iowidth);
94 if (err != 0)
95 return (err);
96
97 /*
98 * Finalize configuration.
99 */
100 di->bas.chan = 0;
101 di->bas.regshft = shift;
102 di->bas.regiowidth = iowidth;
103 di->baudrate = br;
104 di->bas.rclk = rclk;
105 di->ops = uart_getops(class);
106 di->databits = 8;
107 di->stopbits = 1;
108 di->parity = UART_PARITY_NONE;
109 di->bas.bst = bst;
110 di->bas.bsh = bsh;
111
112 uart_bus_space_mem = di->bas.bst;
113 uart_bus_space_io = NULL;
114
115 return (err);
116 }
117