2 * Copyright (c) 2012 Damjan Marion <dmarion@Freebsd.org>
5 * Based on OMAP3 INTC code by Ben Gray
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
36 #include <sys/kernel.h>
38 #include <sys/module.h>
40 #include <machine/bus.h>
41 #include <machine/intr.h>
43 #include <dev/fdt/fdt_common.h>
44 #include <dev/ofw/openfirm.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
48 #define INTC_PENDING_BASIC 0x00
49 #define INTC_PENDING_BANK1 0x04
50 #define INTC_PENDING_BANK2 0x08
51 #define INTC_FIQ_CONTROL 0x0C
52 #define INTC_ENABLE_BANK1 0x10
53 #define INTC_ENABLE_BANK2 0x14
54 #define INTC_ENABLE_BASIC 0x18
55 #define INTC_DISABLE_BANK1 0x1C
56 #define INTC_DISABLE_BANK2 0x20
57 #define INTC_DISABLE_BASIC 0x24
60 #define BANK1_END (BANK1_START + 32 - 1)
61 #define BANK2_START (BANK1_START + 32)
62 #define BANK2_END (BANK2_START + 32 - 1)
63 #define BANK3_START (BANK2_START + 32)
65 #define IS_IRQ_BASIC(n) (((n) >= 0) && ((n) < BANK1_START))
66 #define IS_IRQ_BANK1(n) (((n) >= BANK1_START) && ((n) <= BANK1_END))
67 #define IS_IRQ_BANK2(n) (((n) >= BANK2_START) && ((n) <= BANK2_END))
68 #define IRQ_BANK1(n) ((n) - BANK1_START)
69 #define IRQ_BANK2(n) ((n) - BANK2_START)
72 #define dprintf(fmt, args...) printf(fmt, ##args)
74 #define dprintf(fmt, args...)
77 struct bcm_intc_softc {
79 struct resource * intc_res;
80 bus_space_tag_t intc_bst;
81 bus_space_handle_t intc_bsh;
84 static struct bcm_intc_softc *bcm_intc_sc = NULL;
86 #define intc_read_4(reg) \
87 bus_space_read_4(bcm_intc_sc->intc_bst, bcm_intc_sc->intc_bsh, reg)
88 #define intc_write_4(reg, val) \
89 bus_space_write_4(bcm_intc_sc->intc_bst, bcm_intc_sc->intc_bsh, reg, val)
92 bcm_intc_probe(device_t dev)
95 if (!ofw_bus_status_okay(dev))
98 if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-armctrl-ic"))
100 device_set_desc(dev, "BCM2835 Interrupt Controller");
101 return (BUS_PROBE_DEFAULT);
105 bcm_intc_attach(device_t dev)
107 struct bcm_intc_softc *sc = device_get_softc(dev);
115 sc->intc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
116 if (sc->intc_res == NULL) {
117 device_printf(dev, "could not allocate memory resource\n");
121 sc->intc_bst = rman_get_bustag(sc->intc_res);
122 sc->intc_bsh = rman_get_bushandle(sc->intc_res);
129 static device_method_t bcm_intc_methods[] = {
130 DEVMETHOD(device_probe, bcm_intc_probe),
131 DEVMETHOD(device_attach, bcm_intc_attach),
135 static driver_t bcm_intc_driver = {
138 sizeof(struct bcm_intc_softc),
141 static devclass_t bcm_intc_devclass;
143 DRIVER_MODULE(intc, simplebus, bcm_intc_driver, bcm_intc_devclass, 0, 0);
146 arm_get_next_irq(int last_irq)
149 int32_t irq = last_irq + 1;
155 /* TODO: should we mask last_irq? */
156 if (irq < BANK1_START) {
157 pending = intc_read_4(INTC_PENDING_BASIC);
158 if ((pending & 0xFF) == 0) {
159 irq = BANK1_START; /* skip to next bank */
161 if (pending & (1 << irq))
164 } while (irq < BANK1_START);
166 if (irq < BANK2_START) {
167 pending = intc_read_4(INTC_PENDING_BANK1);
169 irq = BANK2_START; /* skip to next bank */
171 if (pending & (1 << IRQ_BANK1(irq)))
174 } while (irq < BANK2_START);
176 if (irq < BANK3_START) {
177 pending = intc_read_4(INTC_PENDING_BANK2);
178 if (pending != 0) do {
179 if (pending & (1 << IRQ_BANK2(irq)))
182 } while (irq < BANK3_START);
188 arm_mask_irq(uintptr_t nb)
190 dprintf("%s: %d\n", __func__, nb);
192 if (IS_IRQ_BASIC(nb))
193 intc_write_4(INTC_DISABLE_BASIC, (1 << nb));
194 else if (IS_IRQ_BANK1(nb))
195 intc_write_4(INTC_DISABLE_BANK1, (1 << IRQ_BANK1(nb)));
196 else if (IS_IRQ_BANK2(nb))
197 intc_write_4(INTC_DISABLE_BANK2, (1 << IRQ_BANK2(nb)));
199 printf("arm_mask_irq: Invalid IRQ number: %d\n", nb);
203 arm_unmask_irq(uintptr_t nb)
205 dprintf("%s: %d\n", __func__, nb);
207 if (IS_IRQ_BASIC(nb))
208 intc_write_4(INTC_ENABLE_BASIC, (1 << nb));
209 else if (IS_IRQ_BANK1(nb))
210 intc_write_4(INTC_ENABLE_BANK1, (1 << IRQ_BANK1(nb)));
211 else if (IS_IRQ_BANK2(nb))
212 intc_write_4(INTC_ENABLE_BANK2, (1 << IRQ_BANK2(nb)));
214 printf("arm_mask_irq: Invalid IRQ number: %d\n", nb);