2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2010 Greg Ansley. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include "opt_platform.h"
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
38 #include <sys/systm.h>
40 #include <machine/bus.h>
42 #include <arm/at91/at91var.h>
43 #include <arm/at91/at91_rstreg.h>
44 #include <arm/at91/at91board.h>
47 #include <dev/ofw/ofw_bus.h>
48 #include <dev/ofw/ofw_bus_subr.h>
52 #define RST_TIMEOUT (5) /* Seconds to hold NRST for hard reset */
53 #define RST_TICK (20) /* sample NRST at hz/RST_TICK intervals */
56 static int at91_rst_intr(void *arg);
59 static struct at91_rst_softc {
60 struct resource *mem_res; /* Memory resource */
61 struct resource *irq_res; /* IRQ resource */
62 void *intrhand; /* Interrupt handle */
63 struct callout tick_ch; /* Tick callout */
65 u_int shutdown; /* Shutdown in progress */
68 static inline uint32_t
69 RD4(struct at91_rst_softc *sc, bus_size_t off)
72 return (bus_read_4(sc->mem_res, off));
76 WR4(struct at91_rst_softc *sc, bus_size_t off, uint32_t val)
79 bus_write_4(sc->mem_res, off, val);
82 void cpu_reset_sam9g20(void) __attribute__((weak));
83 void cpu_reset_sam9g20(void) {}
86 at91_rst_cpu_reset(void)
90 cpu_reset_sam9g20(); /* May be null */
92 WR4(at91_rst_sc, RST_MR,
93 RST_MR_ERSTL(0xd) | RST_MR_URSTEN | RST_MR_KEY);
95 WR4(at91_rst_sc, RST_CR,
106 at91_rst_probe(device_t dev)
109 if (!ofw_bus_is_compatible(dev, "atmel,at91sam9260-rstc"))
113 device_set_desc(dev, "AT91SAM9 Reset Controller");
118 at91_rst_attach(device_t dev)
120 struct at91_rst_softc *sc;
124 at91_rst_sc = sc = device_get_softc(dev);
127 callout_init(&sc->tick_ch, 0);
130 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
132 if (sc->mem_res == NULL) {
133 device_printf(dev, "could not allocate memory resources.\n");
140 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
141 RF_ACTIVE | RF_SHAREABLE);
142 if (sc->irq_res == NULL) {
143 device_printf(dev, "could not allocate interrupt resources.\n");
148 /* Activate the interrupt. */
149 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
150 at91_rst_intr, NULL, sc, &sc->intrhand);
152 device_printf(dev, "could not establish interrupt handler.\n");
155 WR4(at91_rst_sc, RST_MR, RST_MR_ERSTL(0xd) | RST_MR_URSIEN | RST_MR_KEY);
157 switch (RD4(sc, RST_SR) & RST_SR_RST_MASK) {
161 case RST_SR_RST_WAKE:
167 case RST_SR_RST_SOFT:
168 cause = "Software Request";
171 cause = "External (User)";
178 device_printf(dev, "Reset cause: %s.\n", cause);
185 at91_rst_tick(void *argp)
187 struct at91_rst_softc *sc = argp;
189 if (sc->shutdown++ >= RST_TIMEOUT * RST_TICK) {
190 /* User released the button in morre than RST_TIMEOUT */
192 } else if ((RD4(sc, RST_SR) & RST_SR_NRSTL)) {
193 /* User released the button in less than RST_TIMEOUT */
195 device_printf(sc->sc_dev, "shutting down...\n");
198 callout_reset(&sc->tick_ch, hz/RST_TICK, at91_rst_tick, sc);
203 at91_rst_intr(void *argp)
205 struct at91_rst_softc *sc = argp;
207 if (RD4(sc, RST_SR) & RST_SR_URSTS) {
208 if (sc->shutdown == 0)
209 callout_reset(&sc->tick_ch, hz/RST_TICK, at91_rst_tick, sc);
210 return (FILTER_HANDLED);
212 return (FILTER_STRAY);
216 static device_method_t at91_rst_methods[] = {
217 DEVMETHOD(device_probe, at91_rst_probe),
218 DEVMETHOD(device_attach, at91_rst_attach),
222 static driver_t at91_rst_driver = {
225 sizeof(struct at91_rst_softc),
228 static devclass_t at91_rst_devclass;
231 DRIVER_MODULE(at91_rst, simplebus, at91_rst_driver, at91_rst_devclass, NULL,
234 DRIVER_MODULE(at91_rst, atmelarm, at91_rst_driver, at91_rst_devclass, NULL,