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("$FreeBSD$");
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
55static int uart_ar933x_probe(device_t dev);
56extern struct uart_class uart_ar933x_uart_class;
57
58static 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
66static driver_t uart_ar933x_driver = {
67	uart_driver_name,
68	uart_ar933x_methods,
69	sizeof(struct uart_softc),
70};
71
72extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
73
74static int
75uart_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)
100static void
101ar933x_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}
114early_putc_t *early_putc = ar933x_early_putc;
115#endif	/* EARLY_PRINTF */
116
117DRIVER_MODULE(uart, apb, uart_ar933x_driver, uart_devclass, 0, 0);
118