uart_bus_scc.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004-2006 Marcel Moolenaar
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 *
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 ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/sys/dev/uart/uart_bus_scc.c 330897 2018-03-14 03:19:51Z eadler $");
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#include <sys/rman.h>
41#include <machine/resource.h>
42
43#include <dev/scc/scc_bus.h>
44
45#include <dev/uart/uart.h>
46#include <dev/uart/uart_bus.h>
47
48static int uart_scc_attach(device_t dev);
49static int uart_scc_probe(device_t dev);
50
51static device_method_t uart_scc_methods[] = {
52	/* Device interface */
53	DEVMETHOD(device_probe,		uart_scc_probe),
54	DEVMETHOD(device_attach,	uart_scc_attach),
55	DEVMETHOD(device_detach,	uart_bus_detach),
56	/* Serdev interface */
57	DEVMETHOD(serdev_ihand,		uart_bus_ihand),
58	DEVMETHOD(serdev_sysdev,	uart_bus_sysdev),
59	{ 0, 0 }
60};
61
62static driver_t uart_scc_driver = {
63	uart_driver_name,
64	uart_scc_methods,
65	sizeof(struct uart_softc),
66};
67
68static int
69uart_scc_attach(device_t dev)
70{
71	device_t parent;
72	struct uart_softc *sc;
73	uintptr_t mtx;
74
75	parent = device_get_parent(dev);
76	sc = device_get_softc(dev);
77
78	if (BUS_READ_IVAR(parent, dev, SCC_IVAR_HWMTX, &mtx))
79		return (ENXIO);
80	sc->sc_hwmtx = (struct mtx *)(void *)mtx;
81	return (uart_bus_attach(dev));
82}
83
84static int
85uart_scc_probe(device_t dev)
86{
87	device_t parent;
88	struct uart_softc *sc;
89	uintptr_t ch, cl, md, rs;
90
91	parent = device_get_parent(dev);
92	sc = device_get_softc(dev);
93
94	if (BUS_READ_IVAR(parent, dev, SCC_IVAR_MODE, &md) ||
95	    BUS_READ_IVAR(parent, dev, SCC_IVAR_CLASS, &cl))
96		return (ENXIO);
97	if (md != SCC_MODE_ASYNC)
98		return (ENXIO);
99	switch (cl) {
100	case SCC_CLASS_QUICC:
101		sc->sc_class = &uart_quicc_class;
102		break;
103	case SCC_CLASS_SAB82532:
104		sc->sc_class = &uart_sab82532_class;
105		break;
106	case SCC_CLASS_Z8530:
107		sc->sc_class = &uart_z8530_class;
108		break;
109	default:
110		return (ENXIO);
111	}
112	if (BUS_READ_IVAR(parent, dev, SCC_IVAR_CHANNEL, &ch) ||
113	    BUS_READ_IVAR(parent, dev, SCC_IVAR_CLOCK, &cl) ||
114	    BUS_READ_IVAR(parent, dev, SCC_IVAR_REGSHFT, &rs))
115		return (ENXIO);
116
117	return (uart_bus_probe(dev, rs, cl, 0, ch));
118}
119
120DRIVER_MODULE(uart, scc, uart_scc_driver, uart_devclass, 0, 0);
121