2 * Copyright (c) 2010 Greg Ansley. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 #include "opt_platform.h"
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
36 #include <sys/systm.h>
38 #include <machine/bus.h>
40 #include <arm/at91/at91var.h>
41 #include <arm/at91/at91_rstreg.h>
42 #include <arm/at91/at91board.h>
45 #include <dev/fdt/fdt_common.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
51 #define RST_TIMEOUT (5) /* Seconds to hold NRST for hard reset */
52 #define RST_TICK (20) /* sample NRST at hz/RST_TICK intervals */
55 static int at91_rst_intr(void *arg);
58 static struct at91_rst_softc {
59 struct resource *mem_res; /* Memory resource */
60 struct resource *irq_res; /* IRQ resource */
61 void *intrhand; /* Interrupt handle */
62 struct callout tick_ch; /* Tick callout */
64 u_int shutdown; /* Shutdown in progress */
67 static inline uint32_t
68 RD4(struct at91_rst_softc *sc, bus_size_t off)
71 return (bus_read_4(sc->mem_res, off));
75 WR4(struct at91_rst_softc *sc, bus_size_t off, uint32_t val)
78 bus_write_4(sc->mem_res, off, val);
81 void cpu_reset_sam9g20(void) __attribute__((weak));
82 void cpu_reset_sam9g20(void) {}
85 at91_rst_cpu_reset(void)
89 cpu_reset_sam9g20(); /* May be null */
91 WR4(at91_rst_sc, RST_MR,
92 RST_MR_ERSTL(0xd) | RST_MR_URSTEN | RST_MR_KEY);
94 WR4(at91_rst_sc, RST_CR,
105 at91_rst_probe(device_t dev)
108 if (!ofw_bus_is_compatible(dev, "atmel,at91sam9260-rstc"))
112 device_set_desc(dev, "AT91SAM9 Reset Controller");
117 at91_rst_attach(device_t dev)
119 struct at91_rst_softc *sc;
123 at91_rst_sc = sc = device_get_softc(dev);
126 callout_init(&sc->tick_ch, 0);
129 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
131 if (sc->mem_res == NULL) {
132 device_printf(dev, "could not allocate memory resources.\n");
139 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
140 RF_ACTIVE | RF_SHAREABLE);
141 if (sc->irq_res == NULL) {
142 device_printf(dev, "could not allocate interrupt resources.\n");
147 /* Activate the interrupt. */
148 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
149 at91_rst_intr, NULL, sc, &sc->intrhand);
151 device_printf(dev, "could not establish interrupt handler.\n");
154 WR4(at91_rst_sc, RST_MR, RST_MR_ERSTL(0xd) | RST_MR_URSIEN | RST_MR_KEY);
156 switch (RD4(sc, RST_SR) & RST_SR_RST_MASK) {
160 case RST_SR_RST_WAKE:
166 case RST_SR_RST_SOFT:
167 cause = "Software Request";
170 cause = "External (User)";
177 device_printf(dev, "Reset cause: %s.\n", cause);
184 at91_rst_tick(void *argp)
186 struct at91_rst_softc *sc = argp;
188 if (sc->shutdown++ >= RST_TIMEOUT * RST_TICK) {
189 /* User released the button in morre than RST_TIMEOUT */
191 } else if ((RD4(sc, RST_SR) & RST_SR_NRSTL)) {
192 /* User released the button in less than RST_TIMEOUT */
194 device_printf(sc->sc_dev, "shutting down...\n");
197 callout_reset(&sc->tick_ch, hz/RST_TICK, at91_rst_tick, sc);
202 at91_rst_intr(void *argp)
204 struct at91_rst_softc *sc = argp;
206 if (RD4(sc, RST_SR) & RST_SR_URSTS) {
207 if (sc->shutdown == 0)
208 callout_reset(&sc->tick_ch, hz/RST_TICK, at91_rst_tick, sc);
209 return (FILTER_HANDLED);
211 return (FILTER_STRAY);
215 static device_method_t at91_rst_methods[] = {
216 DEVMETHOD(device_probe, at91_rst_probe),
217 DEVMETHOD(device_attach, at91_rst_attach),
221 static driver_t at91_rst_driver = {
224 sizeof(struct at91_rst_softc),
227 static devclass_t at91_rst_devclass;
230 DRIVER_MODULE(at91_rst, simplebus, at91_rst_driver, at91_rst_devclass, NULL,
233 DRIVER_MODULE(at91_rst, atmelarm, at91_rst_driver, at91_rst_devclass, NULL,