uart_bus_chipc.c revision 301409 
1/*-
2 * Copyright (c) 2016 Michael Zhilin <mizhka@gmail.com>
3 *
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/sys/mips/broadcom/uart_bus_chipc.c 301409 2016-06-04 19:39:05Z landonf $");
30
31#include "opt_uart.h"
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/bus.h>
36#include <sys/conf.h>
37#include <sys/kernel.h>
38#include <sys/module.h>
39#include <sys/rman.h>
40
41#include <machine/bus.h>
42#include <machine/resource.h>
43
44#include <dev/uart/uart.h>
45#include <dev/uart/uart_bus.h>
46#include <dev/uart/uart_cpu.h>
47
48#include <dev/bhnd/cores/chipc/chipcvar.h>
49
50#include "uart_if.h"
51#include "bhnd_chipc_if.h"
52
53
54static int	uart_chipc_probe(device_t dev);
55
56extern SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs;
57
58static void
59uart_chipc_identify(driver_t *driver, device_t parent)
60{
61	struct chipc_caps	*caps;
62
63	if (device_find_child(parent, "uart", -1) != NULL)
64		return;
65
66	caps = BHND_CHIPC_GET_CAPS(parent);
67
68	if (caps == NULL) {
69		device_printf(parent, "error: can't retrieve ChipCommon "
70		    "capabilities\n");
71		return;
72	}
73
74	if (caps->num_uarts == 0)
75		return;
76
77	/*
78	 * TODO: add more than one UART
79	 */
80	BUS_ADD_CHILD(parent, 0, "uart", -1);
81}
82
83static int
84uart_chipc_probe(device_t dev)
85{
86	struct uart_softc 	*sc;
87	struct resource		*res;
88	int			 rid;
89	int			 err;
90
91	rid = 0;
92	res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
93	if (res == NULL) {
94		device_printf(dev, "can't allocate main resource\n");
95		return (ENXIO);
96	}
97
98	sc = device_get_softc(dev);
99	sc->sc_class = &uart_ns8250_class;
100	sc->sc_sysdev = SLIST_FIRST(&uart_sysdevs);
101	if (sc->sc_sysdev == NULL) {
102		device_printf(dev, "missing sysdev\n");
103		return (EINVAL);
104	}
105
106	bcopy(&sc->sc_sysdev->bas, &sc->sc_bas, sizeof(sc->sc_bas));
107
108	sc->sc_sysdev->bas.bst = rman_get_bustag(res);
109	sc->sc_sysdev->bas.bsh = rman_get_bushandle(res);
110	sc->sc_bas.bst = sc->sc_sysdev->bas.bst;
111	sc->sc_bas.bsh = sc->sc_sysdev->bas.bsh;
112
113	err = bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
114	if (err) {
115		device_printf(dev, "can't release resource [%d]\n", rid);
116		return (ENXIO);
117	}
118
119	/* We use internal SoC clock generator with non-standart freq MHz */
120	return (uart_bus_probe(dev, 0, sc->sc_sysdev->bas.rclk, 0, 0));
121}
122
123static device_method_t uart_chipc_methods[] = {
124	/* Device interface */
125	DEVMETHOD(device_identify,	uart_chipc_identify),
126	DEVMETHOD(device_probe,		uart_chipc_probe),
127	DEVMETHOD(device_attach,	uart_bus_attach),
128	DEVMETHOD(device_detach,	uart_bus_detach),
129	{ 0, 0 }
130};
131
132static driver_t uart_chipc_driver = {
133	uart_driver_name,
134	uart_chipc_methods,
135	sizeof(struct uart_softc),
136};
137
138DRIVER_MODULE(uart, bhnd_chipc, uart_chipc_driver, uart_devclass, 0, 0);
139