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