1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2012, Adrian Chadd <adrian@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_ar933x.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 <mips/atheros/uart_dev_ar933x.h>
49 #ifdef EARLY_PRINTF
50 #include <mips/atheros/ar933x_uart.h>
51 #endif
52
53 #include "uart_if.h"
54
55 static int uart_ar933x_probe(device_t dev);
56 extern struct uart_class uart_ar933x_uart_class;
57
58 static device_method_t uart_ar933x_methods[] = {
59 /* Device interface */
60 DEVMETHOD(device_probe, uart_ar933x_probe),
61 DEVMETHOD(device_attach, uart_bus_attach),
62 DEVMETHOD(device_detach, uart_bus_detach),
63 { 0, 0 }
64 };
65
66 static driver_t uart_ar933x_driver = {
67 uart_driver_name,
68 uart_ar933x_methods,
69 sizeof(struct uart_softc),
70 };
71
72 extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
73
74 static int
75 uart_ar933x_probe(device_t dev)
76 {
77 struct uart_softc *sc;
78 uint64_t freq;
79
80 freq = ar71xx_uart_freq();
81
82 sc = device_get_softc(dev);
83 sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
84 sc->sc_class = &uart_ar933x_class;
85 bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
86 sc->sc_sysdev->bas.regshft = 0;
87 sc->sc_sysdev->bas.bst = mips_bus_space_generic;
88 sc->sc_sysdev->bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
89 sc->sc_bas.regshft = 0;
90 sc->sc_bas.bst = mips_bus_space_generic;
91 sc->sc_bas.bsh = MIPS_PHYS_TO_KSEG1(AR71XX_UART_ADDR);
92
93 return (uart_bus_probe(dev, 2, 0, freq, 0, 0, 0));
94 }
95
96 /*
97 * Assume the UART is setup by the bootloader and just echo that.
98 */
99 #if defined(EARLY_PRINTF)
100 static void
101 ar933x_early_putc(int c)
102 {
103 int i = 1000;
104
105 /* Wait until FIFO is clear */
106 while ((i > 0) && (ATH_READ_REG(AR71XX_UART_ADDR + AR933X_UART_CS_REG) &
107 AR933X_UART_CS_TX_BUSY))
108 i--;
109
110 /* Write it out */
111 ATH_WRITE_REG(AR71XX_UART_ADDR + AR933X_UART_DATA_REG,
112 (c & 0xff)| AR933X_UART_DATA_TX_CSR);
113 }
114 early_putc_t *early_putc = ar933x_early_putc;
115 #endif /* EARLY_PRINTF */
116
117 DRIVER_MODULE(uart, apb, uart_ar933x_driver, uart_devclass, 0, 0);
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