FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/pl190.c
1 /*-
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@bluezbox.com>
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/10.0/sys/arm/arm/pl190.c 244195 2012-12-13 23:03:37Z gonzo $");
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 VICIRQSTATUS 0x000
53 #define VICFIQSTATUS 0x004
54 #define VICRAWINTR 0x008
55 #define VICINTSELECT 0x00C
56 #define VICINTENABLE 0x010
57 #define VICINTENCLEAR 0x014
58 #define VICSOFTINT 0x018
59 #define VICSOFTINTCLEAR 0x01C
60 #define VICPROTECTION 0x020
61 #define VICPERIPHID 0xFE0
62 #define VICPRIMECELLID 0xFF0
63
64 #define VIC_NIRQS 32
65
66 struct pl190_intc_softc {
67 device_t sc_dev;
68 struct resource * intc_res;
69 };
70
71 static struct pl190_intc_softc *pl190_intc_sc = NULL;
72
73 #define intc_vic_read_4(reg) \
74 bus_read_4(pl190_intc_sc->intc_res, (reg))
75 #define intc_vic_write_4(reg, val) \
76 bus_write_4(pl190_intc_sc->intc_res, (reg), (val))
77
78 static int
79 pl190_intc_probe(device_t dev)
80 {
81 if (!ofw_bus_is_compatible(dev, "arm,versatile-vic"))
82 return (ENXIO);
83 device_set_desc(dev, "ARM PL190 VIC");
84 return (BUS_PROBE_DEFAULT);
85 }
86
87 static int
88 pl190_intc_attach(device_t dev)
89 {
90 struct pl190_intc_softc *sc = device_get_softc(dev);
91 uint32_t id;
92 int i, rid;
93
94 sc->sc_dev = dev;
95
96 if (pl190_intc_sc)
97 return (ENXIO);
98
99 /* Request memory resources */
100 rid = 0;
101 sc->intc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
102 RF_ACTIVE);
103 if (sc->intc_res == NULL) {
104 device_printf(dev, "Error: could not allocate memory resources\n");
105 return (ENXIO);
106 }
107
108 pl190_intc_sc = sc;
109 /*
110 * All interrupts should use IRQ line
111 */
112 intc_vic_write_4(VICINTSELECT, 0x00000000);
113 /* Disable all interrupts */
114 intc_vic_write_4(VICINTENCLEAR, 0xffffffff);
115 /* Enable INT31, SIC IRQ */
116 intc_vic_write_4(VICINTENABLE, (1 << 31));
117
118 id = 0;
119 for (i = 3; i >= 0; i--) {
120 id = (id << 8) |
121 (intc_vic_read_4(VICPERIPHID + i*4) & 0xff);
122 }
123
124 device_printf(dev, "Peripheral ID: %08x\n", id);
125
126 id = 0;
127 for (i = 3; i >= 0; i--) {
128 id = (id << 8) |
129 (intc_vic_read_4(VICPRIMECELLID + i*4) & 0xff);
130 }
131
132 device_printf(dev, "PrimeCell ID: %08x\n", id);
133
134 return (0);
135 }
136
137 static device_method_t pl190_intc_methods[] = {
138 DEVMETHOD(device_probe, pl190_intc_probe),
139 DEVMETHOD(device_attach, pl190_intc_attach),
140 { 0, 0 }
141 };
142
143 static driver_t pl190_intc_driver = {
144 "intc",
145 pl190_intc_methods,
146 sizeof(struct pl190_intc_softc),
147 };
148
149 static devclass_t pl190_intc_devclass;
150
151 DRIVER_MODULE(intc, simplebus, pl190_intc_driver, pl190_intc_devclass, 0, 0);
152
153 int
154 arm_get_next_irq(int last_irq)
155 {
156 uint32_t pending;
157 int32_t irq = last_irq + 1;
158
159 /* Sanity check */
160 if (irq < 0)
161 irq = 0;
162
163 pending = intc_vic_read_4(VICIRQSTATUS);
164 while (irq < VIC_NIRQS) {
165 if (pending & (1 << irq))
166 return (irq);
167 irq++;
168 }
169
170 return (-1);
171 }
172
173 void
174 arm_mask_irq(uintptr_t nb)
175 {
176
177 dprintf("%s: %d\n", __func__, nb);
178 intc_vic_write_4(VICINTENCLEAR, (1 << nb));
179 }
180
181 void
182 arm_unmask_irq(uintptr_t nb)
183 {
184
185 dprintf("%s: %d\n", __func__, nb);
186 intc_vic_write_4(VICINTENABLE, (1 << nb));
187 }
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