2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2012 Damjan Marion <dmarion@Freebsd.org>
7 * Based on OMAP3 INTC code by Ben Gray
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include "opt_platform.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/kernel.h>
42 #include <sys/module.h>
45 #include <machine/bus.h>
46 #include <machine/intr.h>
48 #include <dev/ofw/openfirm.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <dev/ofw/ofw_bus_subr.h>
54 #define INTC_REVISION 0x00
55 #define INTC_SYSCONFIG 0x10
56 #define INTC_SYSSTATUS 0x14
57 #define INTC_SIR_IRQ 0x40
58 #define INTC_CONTROL 0x48
59 #define INTC_THRESHOLD 0x68
60 #define INTC_MIR_CLEAR(x) (0x88 + ((x) * 0x20))
61 #define INTC_MIR_SET(x) (0x8C + ((x) * 0x20))
62 #define INTC_ISR_SET(x) (0x90 + ((x) * 0x20))
63 #define INTC_ISR_CLEAR(x) (0x94 + ((x) * 0x20))
65 #define INTC_SIR_SPURIOUS_MASK 0xffffff80
66 #define INTC_SIR_ACTIVE_MASK 0x7f
68 #define INTC_NIRQS 128
70 struct ti_aintc_irqsrc {
71 struct intr_irqsrc tai_isrc;
75 struct ti_aintc_softc {
77 struct resource * aintc_res[3];
78 bus_space_tag_t aintc_bst;
79 bus_space_handle_t aintc_bsh;
81 struct ti_aintc_irqsrc aintc_isrcs[INTC_NIRQS];
84 static struct resource_spec ti_aintc_spec[] = {
85 { SYS_RES_MEMORY, 0, RF_ACTIVE },
89 #define aintc_read_4(_sc, reg) \
90 bus_space_read_4((_sc)->aintc_bst, (_sc)->aintc_bsh, (reg))
91 #define aintc_write_4(_sc, reg, val) \
92 bus_space_write_4((_sc)->aintc_bst, (_sc)->aintc_bsh, (reg), (val))
94 /* List of compatible strings for FDT tree */
95 static struct ofw_compat_data compat_data[] = {
96 {"ti,am33xx-intc", 1},
102 ti_aintc_irq_eoi(struct ti_aintc_softc *sc)
105 aintc_write_4(sc, INTC_CONTROL, 1);
109 ti_aintc_irq_mask(struct ti_aintc_softc *sc, u_int irq)
112 aintc_write_4(sc, INTC_MIR_SET(irq >> 5), (1UL << (irq & 0x1F)));
116 ti_aintc_irq_unmask(struct ti_aintc_softc *sc, u_int irq)
119 aintc_write_4(sc, INTC_MIR_CLEAR(irq >> 5), (1UL << (irq & 0x1F)));
123 ti_aintc_intr(void *arg)
126 struct ti_aintc_softc *sc = arg;
128 /* Get active interrupt */
129 irq = aintc_read_4(sc, INTC_SIR_IRQ);
130 if ((irq & INTC_SIR_SPURIOUS_MASK) != 0) {
131 device_printf(sc->sc_dev,
132 "Spurious interrupt detected (0x%08x)\n", irq);
133 ti_aintc_irq_eoi(sc);
134 return (FILTER_HANDLED);
137 /* Only level-sensitive interrupts detection is supported. */
138 irq &= INTC_SIR_ACTIVE_MASK;
139 if (intr_isrc_dispatch(&sc->aintc_isrcs[irq].tai_isrc,
140 curthread->td_intr_frame) != 0) {
141 ti_aintc_irq_mask(sc, irq);
142 ti_aintc_irq_eoi(sc);
143 device_printf(sc->sc_dev, "Stray irq %u disabled\n", irq);
146 arm_irq_memory_barrier(irq); /* XXX */
147 return (FILTER_HANDLED);
151 ti_aintc_enable_intr(device_t dev, struct intr_irqsrc *isrc)
153 u_int irq = ((struct ti_aintc_irqsrc *)isrc)->tai_irq;
154 struct ti_aintc_softc *sc = device_get_softc(dev);
156 arm_irq_memory_barrier(irq);
157 ti_aintc_irq_unmask(sc, irq);
161 ti_aintc_disable_intr(device_t dev, struct intr_irqsrc *isrc)
163 u_int irq = ((struct ti_aintc_irqsrc *)isrc)->tai_irq;
164 struct ti_aintc_softc *sc = device_get_softc(dev);
166 ti_aintc_irq_mask(sc, irq);
170 ti_aintc_map_intr(device_t dev, struct intr_map_data *data,
171 struct intr_irqsrc **isrcp)
173 struct intr_map_data_fdt *daf;
174 struct ti_aintc_softc *sc;
176 if (data->type != INTR_MAP_DATA_FDT)
179 daf = (struct intr_map_data_fdt *)data;
180 if (daf->ncells != 1 || daf->cells[0] >= INTC_NIRQS)
183 sc = device_get_softc(dev);
184 *isrcp = &sc->aintc_isrcs[daf->cells[0]].tai_isrc;
189 ti_aintc_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
191 u_int irq = ((struct ti_aintc_irqsrc *)isrc)->tai_irq;
192 struct ti_aintc_softc *sc = device_get_softc(dev);
194 ti_aintc_irq_mask(sc, irq);
195 ti_aintc_irq_eoi(sc);
199 ti_aintc_post_ithread(device_t dev, struct intr_irqsrc *isrc)
202 ti_aintc_enable_intr(dev, isrc);
206 ti_aintc_post_filter(device_t dev, struct intr_irqsrc *isrc)
209 ti_aintc_irq_eoi(device_get_softc(dev));
213 ti_aintc_pic_attach(struct ti_aintc_softc *sc)
215 struct intr_pic *pic;
221 name = device_get_nameunit(sc->sc_dev);
222 for (irq = 0; irq < INTC_NIRQS; irq++) {
223 sc->aintc_isrcs[irq].tai_irq = irq;
225 error = intr_isrc_register(&sc->aintc_isrcs[irq].tai_isrc,
226 sc->sc_dev, 0, "%s,%u", name, irq);
231 xref = OF_xref_from_node(ofw_bus_get_node(sc->sc_dev));
232 pic = intr_pic_register(sc->sc_dev, xref);
236 return (intr_pic_claim_root(sc->sc_dev, xref, ti_aintc_intr, sc, 0));
240 ti_aintc_probe(device_t dev)
242 if (!ofw_bus_status_okay(dev))
245 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
248 device_set_desc(dev, "TI AINTC Interrupt Controller");
249 return (BUS_PROBE_DEFAULT);
253 ti_aintc_attach(device_t dev)
255 struct ti_aintc_softc *sc = device_get_softc(dev);
260 if (bus_alloc_resources(dev, ti_aintc_spec, sc->aintc_res)) {
261 device_printf(dev, "could not allocate resources\n");
265 sc->aintc_bst = rman_get_bustag(sc->aintc_res[0]);
266 sc->aintc_bsh = rman_get_bushandle(sc->aintc_res[0]);
268 x = aintc_read_4(sc, INTC_REVISION);
269 device_printf(dev, "Revision %u.%u\n",(x >> 4) & 0xF, x & 0xF);
272 aintc_write_4(sc, INTC_SYSCONFIG, 2);
274 /* Wait for reset to complete */
275 while(!(aintc_read_4(sc, INTC_SYSSTATUS) & 1));
277 /*Set Priority Threshold */
278 aintc_write_4(sc, INTC_THRESHOLD, 0xFF);
280 if (ti_aintc_pic_attach(sc) != 0) {
281 device_printf(dev, "could not attach PIC\n");
287 static device_method_t ti_aintc_methods[] = {
288 DEVMETHOD(device_probe, ti_aintc_probe),
289 DEVMETHOD(device_attach, ti_aintc_attach),
291 DEVMETHOD(pic_disable_intr, ti_aintc_disable_intr),
292 DEVMETHOD(pic_enable_intr, ti_aintc_enable_intr),
293 DEVMETHOD(pic_map_intr, ti_aintc_map_intr),
294 DEVMETHOD(pic_post_filter, ti_aintc_post_filter),
295 DEVMETHOD(pic_post_ithread, ti_aintc_post_ithread),
296 DEVMETHOD(pic_pre_ithread, ti_aintc_pre_ithread),
301 static driver_t ti_aintc_driver = {
304 sizeof(struct ti_aintc_softc),
307 static devclass_t ti_aintc_devclass;
309 EARLY_DRIVER_MODULE(ti_aintc, simplebus, ti_aintc_driver, ti_aintc_devclass,
310 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
311 SIMPLEBUS_PNP_INFO(compat_data);