2 * Copyright (c) 2013 Rui Paulo <rpaulo@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
23 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
29 #include <sys/param.h>
30 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/malloc.h>
37 #include <sys/event.h>
38 #include <sys/selinfo.h>
39 #include <machine/bus.h>
40 #include <machine/cpu.h>
41 #include <machine/frame.h>
42 #include <machine/intr.h>
44 #include <dev/fdt/fdt_common.h>
45 #include <dev/ofw/openfirm.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
49 #include <machine/bus.h>
51 #include <arm/ti/ti_prcm.h>
52 #include <arm/ti/ti_pruss.h>
55 #define DPRINTF(fmt, ...) do { \
56 printf("%s: ", __func__); \
57 printf(fmt, __VA_ARGS__); \
60 #define DPRINTF(fmt, ...)
63 static device_probe_t ti_pruss_probe;
64 static device_attach_t ti_pruss_attach;
65 static device_detach_t ti_pruss_detach;
66 static void ti_pruss_intr(void *);
67 static d_open_t ti_pruss_open;
68 static d_mmap_t ti_pruss_mmap;
69 static void ti_pruss_kq_read_detach(struct knote *);
70 static int ti_pruss_kq_read_event(struct knote *, long);
71 static d_kqfilter_t ti_pruss_kqfilter;
73 #define TI_PRUSS_IRQS 8
75 struct ti_pruss_softc {
77 struct resource *sc_mem_res;
78 struct resource *sc_irq_res[TI_PRUSS_IRQS];
79 void *sc_intr[TI_PRUSS_IRQS];
80 bus_space_tag_t sc_bt;
81 bus_space_handle_t sc_bh;
83 struct selinfo sc_selinfo;
86 static struct cdevsw ti_pruss_cdevsw = {
87 .d_version = D_VERSION,
89 .d_open = ti_pruss_open,
90 .d_mmap = ti_pruss_mmap,
91 .d_kqfilter = ti_pruss_kqfilter,
94 static device_method_t ti_pruss_methods[] = {
95 DEVMETHOD(device_probe, ti_pruss_probe),
96 DEVMETHOD(device_attach, ti_pruss_attach),
97 DEVMETHOD(device_detach, ti_pruss_detach),
102 static driver_t ti_pruss_driver = {
105 sizeof(struct ti_pruss_softc)
108 static devclass_t ti_pruss_devclass;
110 DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0);
112 static struct resource_spec ti_pruss_irq_spec[] = {
113 { SYS_RES_IRQ, 0, RF_ACTIVE },
114 { SYS_RES_IRQ, 1, RF_ACTIVE },
115 { SYS_RES_IRQ, 2, RF_ACTIVE },
116 { SYS_RES_IRQ, 3, RF_ACTIVE },
117 { SYS_RES_IRQ, 4, RF_ACTIVE },
118 { SYS_RES_IRQ, 5, RF_ACTIVE },
119 { SYS_RES_IRQ, 6, RF_ACTIVE },
120 { SYS_RES_IRQ, 7, RF_ACTIVE },
123 CTASSERT(TI_PRUSS_IRQS == nitems(ti_pruss_irq_spec) - 1);
125 static struct ti_pruss_irq_arg {
127 struct ti_pruss_softc *sc;
128 } ti_pruss_irq_args[TI_PRUSS_IRQS];
130 static __inline uint32_t
131 ti_pruss_reg_read(struct ti_pruss_softc *sc, uint32_t reg)
133 return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
137 ti_pruss_reg_write(struct ti_pruss_softc *sc, uint32_t reg, uint32_t val)
139 bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
143 ti_pruss_probe(device_t dev)
146 if (!ofw_bus_status_okay(dev))
149 if (ofw_bus_is_compatible(dev, "ti,pruss-v1") ||
150 ofw_bus_is_compatible(dev, "ti,pruss-v2")) {
151 device_set_desc(dev, "TI Programmable Realtime Unit Subsystem");
152 return (BUS_PROBE_DEFAULT);
159 ti_pruss_attach(device_t dev)
161 struct ti_pruss_softc *sc;
164 if (ti_prcm_clk_enable(PRUSS_CLK) != 0) {
165 device_printf(dev, "could not enable PRUSS clock\n");
168 sc = device_get_softc(dev);
170 mtx_init(&sc->sc_mtx, "TI PRUSS", NULL, MTX_DEF);
171 knlist_init_mtx(&sc->sc_selinfo.si_note, &sc->sc_mtx);
172 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
174 if (sc->sc_mem_res == NULL) {
175 device_printf(dev, "could not allocate memory resource\n");
178 sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
179 sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
180 if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) {
181 device_printf(dev, "could not allocate interrupt resource\n");
182 ti_pruss_detach(dev);
185 for (i = 0; i < TI_PRUSS_IRQS; i++) {
186 ti_pruss_irq_args[i].irq = i;
187 ti_pruss_irq_args[i].sc = sc;
188 if (bus_setup_intr(dev, sc->sc_irq_res[i],
189 INTR_MPSAFE | INTR_TYPE_MISC,
190 NULL, ti_pruss_intr, &ti_pruss_irq_args[i],
191 &sc->sc_intr[i]) != 0) {
193 "unable to setup the interrupt handler\n");
194 ti_pruss_detach(dev);
198 if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV)
199 device_printf(dev, "AM18xx PRU-ICSS\n");
200 else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV)
201 device_printf(dev, "AM33xx PRU-ICSS\n");
203 sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL,
204 0600, "pruss%d", device_get_unit(dev));
205 sc->sc_pdev->si_drv1 = dev;
211 ti_pruss_detach(device_t dev)
213 struct ti_pruss_softc *sc;
216 sc = device_get_softc(dev);
217 for (i = 0; i < TI_PRUSS_IRQS; i++) {
219 bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]);
220 if (sc->sc_irq_res[i])
221 bus_release_resource(dev, SYS_RES_IRQ,
222 rman_get_rid(sc->sc_irq_res[i]),
225 knlist_clear(&sc->sc_selinfo.si_note, 0);
226 knlist_destroy(&sc->sc_selinfo.si_note);
227 mtx_destroy(&sc->sc_mtx);
229 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
232 destroy_dev(sc->sc_pdev);
238 ti_pruss_intr(void *arg)
241 struct ti_pruss_irq_arg *iap = arg;
242 struct ti_pruss_softc *sc = iap->sc;
244 * Interrupts pr1_host_intr[0:7] are mapped to
245 * Host-2 to Host-9 of PRU-ICSS IRQ-controller.
247 const int pru_int = iap->irq + 2;
248 const int pru_int_mask = (1 << pru_int);
250 val = ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC + PRUSS_INTC_HIER);
251 DPRINTF("interrupt %p, %d", sc, pru_int);
252 if (!(val & pru_int_mask))
254 ti_pruss_reg_write(sc, PRUSS_AM33XX_INTC + PRUSS_INTC_HIDISR,
256 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, pru_int);
260 ti_pruss_open(struct cdev *cdev __unused, int oflags __unused,
261 int devtype __unused, struct thread *td __unused)
267 ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
268 int nprot, vm_memattr_t *memattr)
270 device_t dev = cdev->si_drv1;
271 struct ti_pruss_softc *sc = device_get_softc(dev);
273 if (offset > rman_get_size(sc->sc_mem_res))
275 *paddr = rman_get_start(sc->sc_mem_res) + offset;
276 *memattr = VM_MEMATTR_UNCACHEABLE;
281 static struct filterops ti_pruss_kq_read = {
283 .f_detach = ti_pruss_kq_read_detach,
284 .f_event = ti_pruss_kq_read_event,
288 ti_pruss_kq_read_detach(struct knote *kn)
290 struct ti_pruss_softc *sc = kn->kn_hook;
292 knlist_remove(&sc->sc_selinfo.si_note, kn, 0);
296 ti_pruss_kq_read_event(struct knote *kn, long hint)
304 ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn)
306 device_t dev = cdev->si_drv1;
307 struct ti_pruss_softc *sc = device_get_softc(dev);
309 switch (kn->kn_filter) {
312 kn->kn_fop = &ti_pruss_kq_read;
313 knlist_add(&sc->sc_selinfo.si_note, kn, 1);