1 /*-
2 * Copyright (c) 2012 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * This software was developed by SRI International and the University of
6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
7 * ("CTSRD"), as part of the DARPA CRASH research programme.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/bus.h>
36 #include <sys/condvar.h>
37 #include <sys/conf.h>
38 #include <sys/bio.h>
39 #include <sys/kernel.h>
40 #include <sys/lock.h>
41 #include <sys/malloc.h>
42 #include <sys/module.h>
43 #include <sys/mutex.h>
44 #include <sys/rman.h>
45 #include <sys/systm.h>
46 #include <sys/taskqueue.h>
47
48 #include <machine/bus.h>
49 #include <machine/resource.h>
50
51 #include <geom/geom_disk.h>
52
53 #include <dev/altera/jtag_uart/altera_jtag_uart.h>
54
55 /*
56 * Nexus bus attachment for Altera JTAG UARTs. Appropriate for most Altera
57 * FPGA SoC-style configurations in which the IP core will be exposed to the
58 * processor via a memory-mapped Avalon bus.
59 */
60 static int
61 altera_jtag_uart_nexus_probe(device_t dev)
62 {
63
64 device_set_desc(dev, "Altera JTAG UART");
65 return (BUS_PROBE_NOWILDCARD);
66 }
67
68 static int
69 altera_jtag_uart_nexus_attach(device_t dev)
70 {
71 struct altera_jtag_uart_softc *sc;
72 int error;
73
74 error = 0;
75 sc = device_get_softc(dev);
76 sc->ajus_dev = dev;
77 sc->ajus_unit = device_get_unit(dev);
78 sc->ajus_mem_rid = 0;
79 sc->ajus_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
80 &sc->ajus_mem_rid, RF_ACTIVE);
81 if (sc->ajus_mem_res == NULL) {
82 device_printf(dev, "couldn't map memory\n");
83 error = ENXIO;
84 goto out;
85 }
86
87 /*
88 * Interrupt support is optional -- if we can't allocate an IRQ, then
89 * we fall back on polling.
90 */
91 sc->ajus_irq_rid = 0;
92 sc->ajus_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ,
93 &sc->ajus_irq_rid, RF_ACTIVE | RF_SHAREABLE);
94 if (sc->ajus_irq_res == NULL)
95 device_printf(dev,
96 "IRQ unavailable; selecting polled operation\n");
97 error = altera_jtag_uart_attach(sc);
98 out:
99 if (error) {
100 if (sc->ajus_irq_res != NULL)
101 bus_release_resource(dev, SYS_RES_IRQ,
102 sc->ajus_irq_rid, sc->ajus_irq_res);
103 if (sc->ajus_mem_res != NULL)
104 bus_release_resource(dev, SYS_RES_MEMORY,
105 sc->ajus_mem_rid, sc->ajus_mem_res);
106 }
107 return (error);
108 }
109
110 static int
111 altera_jtag_uart_nexus_detach(device_t dev)
112 {
113 struct altera_jtag_uart_softc *sc;
114
115 sc = device_get_softc(dev);
116 KASSERT(sc->ajus_mem_res != NULL, ("%s: resources not allocated",
117 __func__));
118
119 altera_jtag_uart_detach(sc);
120 bus_release_resource(dev, SYS_RES_IRQ, sc->ajus_irq_rid,
121 sc->ajus_irq_res);
122 bus_release_resource(dev, SYS_RES_MEMORY, sc->ajus_mem_rid,
123 sc->ajus_mem_res);
124 return (0);
125 }
126
127 static device_method_t altera_jtag_uart_nexus_methods[] = {
128 DEVMETHOD(device_probe, altera_jtag_uart_nexus_probe),
129 DEVMETHOD(device_attach, altera_jtag_uart_nexus_attach),
130 DEVMETHOD(device_detach, altera_jtag_uart_nexus_detach),
131 { 0, 0 }
132 };
133
134 static driver_t altera_jtag_uart_nexus_driver = {
135 "altera_jtag_uart",
136 altera_jtag_uart_nexus_methods,
137 sizeof(struct altera_jtag_uart_softc),
138 };
139
140 DRIVER_MODULE(altera_jtag_uart, nexus, altera_jtag_uart_nexus_driver,
141 altera_jtag_uart_devclass, 0, 0);
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