1 /*-
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/10.3/sys/arm/versatile/versatile_sic.c 266152 2014-05-15 16:11:06Z ian $");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/kernel.h>
35 #include <sys/ktr.h>
36 #include <sys/module.h>
37 #include <sys/rman.h>
38 #include <machine/bus.h>
39 #include <machine/intr.h>
40
41 #include <dev/fdt/fdt_common.h>
42 #include <dev/ofw/openfirm.h>
43 #include <dev/ofw/ofw_bus.h>
44 #include <dev/ofw/ofw_bus_subr.h>
45
46 #ifdef DEBUG
47 #define dprintf(fmt, args...) printf(fmt, ##args)
48 #else
49 #define dprintf(fmt, args...)
50 #endif
51
52 #define SIC_STATUS 0x00
53 #define SIC_RAWSTAT 0x04
54 #define SIC_ENABLE 0x08
55 #define SIC_ENSET 0x08
56 #define SIC_ENCLR 0x0C
57 #define SIC_SOFTINTSET 0x10
58 #define SIC_SOFTINTCLR 0x14
59 #define SIC_PICENABLE 0x20
60 #define SIC_PICENSET 0x20
61 #define SIC_PICENCLR 0x24
62
63 struct versatile_sic_softc {
64 device_t sc_dev;
65 struct resource * mem_res;
66 };
67
68 #define sic_read_4(sc, reg) \
69 bus_read_4(sc->mem_res, (reg))
70 #define sic_write_4(sc, reg, val) \
71 bus_write_4(sc->mem_res, (reg), (val))
72
73 static int
74 versatile_sic_probe(device_t dev)
75 {
76
77 if (!ofw_bus_status_okay(dev))
78 return (ENXIO);
79
80 if (!ofw_bus_is_compatible(dev, "arm,versatile-sic"))
81 return (ENXIO);
82 device_set_desc(dev, "ARM Versatile SIC");
83 return (BUS_PROBE_DEFAULT);
84 }
85
86 static int
87 versatile_sic_attach(device_t dev)
88 {
89 struct versatile_sic_softc *sc = device_get_softc(dev);
90 uint32_t pass_irqs;
91 int rid;
92
93 sc->sc_dev = dev;
94
95 /* Request memory resources */
96 rid = 0;
97 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
98 RF_ACTIVE);
99 if (sc->mem_res == NULL) {
100 device_printf(dev, "Error: could not allocate memory resources\n");
101 return (ENXIO);
102 }
103
104 /* Disable all interrupts on SIC */
105 sic_write_4(sc, SIC_ENCLR, 0xffffffff);
106
107 /*
108 * XXX: Enable IRQ3 for KMI
109 * Should be replaced by proper interrupts cascading
110 */
111 sic_write_4(sc, SIC_ENSET, (1 << 3));
112
113 /*
114 * Let PCI and Ethernet interrupts pass through
115 * IRQ25, IRQ27..IRQ31
116 */
117 pass_irqs = (0x1f << 27) | (1 << 25);
118 sic_write_4(sc, SIC_PICENSET, pass_irqs);
119
120 return (0);
121 }
122
123 static device_method_t versatile_sic_methods[] = {
124 DEVMETHOD(device_probe, versatile_sic_probe),
125 DEVMETHOD(device_attach, versatile_sic_attach),
126 { 0, 0 }
127 };
128
129 static driver_t versatile_sic_driver = {
130 "sic",
131 versatile_sic_methods,
132 sizeof(struct versatile_sic_softc),
133 };
134
135 static devclass_t versatile_sic_devclass;
136
137 DRIVER_MODULE(sic, simplebus, versatile_sic_driver, versatile_sic_devclass, 0, 0);
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