1/*-
2 * Copyright (c) 2009-2010 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Semihalf under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: stable/11/sys/dev/uart/uart_cpu_fdt.c 340145 2018-11-04 23:28:56Z mmacy $");
32
33#include "opt_platform.h"
34
35#include <sys/param.h>
36#include <sys/bus.h>
37#include <sys/kernel.h>
38#include <sys/module.h>
39#include <sys/systm.h>
40
41#include <vm/vm.h>
42#include <vm/pmap.h>
43
44#include <machine/bus.h>
45
46#include <dev/fdt/fdt_common.h>
47#include <dev/ofw/ofw_bus.h>
48#include <dev/ofw/ofw_bus_subr.h>
49#include <dev/uart/uart.h>
50#include <dev/uart/uart_bus.h>
51#include <dev/uart/uart_cpu.h>
52#include <dev/uart/uart_cpu_fdt.h>
53
54/*
55 * UART console routines.
56 */
57bus_space_tag_t uart_bus_space_io;
58bus_space_tag_t uart_bus_space_mem;
59
60int
61uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
62{
63
64	if (b1->bst != b2->bst)
65		return (0);
66	if (pmap_kextract(b1->bsh) == 0)
67		return (0);
68	if (pmap_kextract(b2->bsh) == 0)
69		return (0);
70	return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
71}
72
73int
74uart_cpu_getdev(int devtype, struct uart_devinfo *di)
75{
76	struct uart_class *class;
77	bus_space_tag_t bst;
78	bus_space_handle_t bsh;
79	u_int shift, rclk;
80	int br, err;
81
82	/* Allow overriding the FDT using the environment. */
83	class = &uart_ns8250_class;
84	err = uart_getenv(devtype, di, class);
85	if (!err)
86		return (0);
87
88	if (devtype != UART_DEV_CONSOLE)
89		return (ENXIO);
90
91	err = uart_cpu_fdt_probe(&class, &bst, &bsh, &br, &rclk, &shift);
92	if (err != 0)
93		return (err);
94
95	/*
96	 * Finalize configuration.
97	 */
98	di->bas.chan = 0;
99	di->bas.regshft = shift;
100	di->baudrate = br;
101	di->bas.rclk = rclk;
102	di->ops = uart_getops(class);
103	di->databits = 8;
104	di->stopbits = 1;
105	di->parity = UART_PARITY_NONE;
106	di->bas.bst = bst;
107	di->bas.bsh = bsh;
108
109	uart_bus_space_mem = di->bas.bst;
110	uart_bus_space_io = NULL;
111
112	return (err);
113}
114