1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 */
27 #include "opt_uart.h"
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/12.0/sys/mips/atheros/uart_bus_ar71xx.c 338074 2018-08-19 21:10:21Z mmacy $");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35 #include <sys/conf.h>
36 #include <sys/kernel.h>
37 #include <sys/module.h>
38
39 #include <machine/bus.h>
40
41 #include <dev/uart/uart.h>
42 #include <dev/uart/uart_cpu.h>
43 #include <dev/uart/uart_bus.h>
44
45 #include <mips/atheros/ar71xxreg.h>
46 #include <mips/atheros/ar71xx_cpudef.h>
47
48 #include "uart_if.h"
49
50 static int uart_ar71xx_probe(device_t dev);
51 extern struct uart_class uart_ar71xx_uart_class;
52
53 static device_method_t uart_ar71xx_methods[] = {
54 /* Device interface */
55 DEVMETHOD(device_probe, uart_ar71xx_probe),
56 DEVMETHOD(device_attach, uart_bus_attach),
57 DEVMETHOD(device_detach, uart_bus_detach),
58 { 0, 0 }
59 };
60
61 static driver_t uart_ar71xx_driver = {
62 uart_driver_name,
63 uart_ar71xx_methods,
64 sizeof(struct uart_softc),
65 };
66
67 extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
68
69 static int
70 uart_ar71xx_probe(device_t dev)
71 {
72 struct uart_softc *sc;
73 uint64_t freq;
74
75 freq = ar71xx_uart_freq();
76
77 sc = device_get_softc(dev);
78 sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
79 sc->sc_class = &uart_ns8250_class;
80 bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
81 sc->sc_sysdev->bas.regshft = 2;
82 sc->sc_sysdev->bas.bst = mips_bus_space_generic;
83 sc->sc_sysdev->bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR) + 3;
84 sc->sc_bas.regshft = 2;
85 sc->sc_bas.bst = mips_bus_space_generic;
86 sc->sc_bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR) + 3;
87
88 return (uart_bus_probe(dev, 2, 0, freq, 0, 0, 0));
89 }
90
91 #ifdef EARLY_PRINTF
92 static void
93 ar71xx_early_putc(int c)
94 {
95 int i;
96
97 for (i = 0; i < 1000; i++) {
98 if (ATH_READ_REG(AR71XX_UART_ADDR + AR71XX_UART_LSR)
99 & AR71XX_UART_LSR_THRE)
100 break;
101 }
102
103 ATH_WRITE_REG(AR71XX_UART_ADDR + AR71XX_UART_THR, (c & 0xff));
104 }
105 early_putc_t *early_putc = ar71xx_early_putc;
106 #endif
107
108 DRIVER_MODULE(uart, apb, uart_ar71xx_driver, uart_devclass, 0, 0);
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