xref: /freebsd/sys/dev/uart/uart_cpu_fdt.c (revision 5ab1c5846ff41be24b1f6beb0317bf8258cd4409)
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
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
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