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/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
50 #define RST_TIMEOUT (5) /* Seconds to hold NRST for hard reset */
51 #define RST_TICK (20) /* sample NRST at hz/RST_TICK intervals */
54 static int at91_rst_intr(void *arg);
57 static struct at91_rst_softc {
58 struct resource *mem_res; /* Memory resource */
59 struct resource *irq_res; /* IRQ resource */
60 void *intrhand; /* Interrupt handle */
61 struct callout tick_ch; /* Tick callout */
63 u_int shutdown; /* Shutdown in progress */
66 static inline uint32_t
67 RD4(struct at91_rst_softc *sc, bus_size_t off)
70 return (bus_read_4(sc->mem_res, off));
74 WR4(struct at91_rst_softc *sc, bus_size_t off, uint32_t val)
77 bus_write_4(sc->mem_res, off, val);
80 void cpu_reset_sam9g20(void) __attribute__((weak));
81 void cpu_reset_sam9g20(void) {}
84 at91_rst_cpu_reset(void)
88 cpu_reset_sam9g20(); /* May be null */
90 WR4(at91_rst_sc, RST_MR,
91 RST_MR_ERSTL(0xd) | RST_MR_URSTEN | RST_MR_KEY);
93 WR4(at91_rst_sc, RST_CR,
104 at91_rst_probe(device_t dev)
107 if (!ofw_bus_is_compatible(dev, "atmel,at91sam9260-rstc"))
111 device_set_desc(dev, "AT91SAM9 Reset Controller");
116 at91_rst_attach(device_t dev)
118 struct at91_rst_softc *sc;
122 at91_rst_sc = sc = device_get_softc(dev);
125 callout_init(&sc->tick_ch, 0);
128 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
130 if (sc->mem_res == NULL) {
131 device_printf(dev, "could not allocate memory resources.\n");
138 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
139 RF_ACTIVE | RF_SHAREABLE);
140 if (sc->irq_res == NULL) {
141 device_printf(dev, "could not allocate interrupt resources.\n");
146 /* Activate the interrupt. */
147 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
148 at91_rst_intr, NULL, sc, &sc->intrhand);
150 device_printf(dev, "could not establish interrupt handler.\n");
153 WR4(at91_rst_sc, RST_MR, RST_MR_ERSTL(0xd) | RST_MR_URSIEN | RST_MR_KEY);
155 switch (RD4(sc, RST_SR) & RST_SR_RST_MASK) {
159 case RST_SR_RST_WAKE:
165 case RST_SR_RST_SOFT:
166 cause = "Software Request";
169 cause = "External (User)";
176 device_printf(dev, "Reset cause: %s.\n", cause);
183 at91_rst_tick(void *argp)
185 struct at91_rst_softc *sc = argp;
187 if (sc->shutdown++ >= RST_TIMEOUT * RST_TICK) {
188 /* User released the button in morre than RST_TIMEOUT */
190 } else if ((RD4(sc, RST_SR) & RST_SR_NRSTL)) {
191 /* User released the button in less than RST_TIMEOUT */
193 device_printf(sc->sc_dev, "shutting down...\n");
196 callout_reset(&sc->tick_ch, hz/RST_TICK, at91_rst_tick, sc);
201 at91_rst_intr(void *argp)
203 struct at91_rst_softc *sc = argp;
205 if (RD4(sc, RST_SR) & RST_SR_URSTS) {
206 if (sc->shutdown == 0)
207 callout_reset(&sc->tick_ch, hz/RST_TICK, at91_rst_tick, sc);
208 return (FILTER_HANDLED);
210 return (FILTER_STRAY);
214 static device_method_t at91_rst_methods[] = {
215 DEVMETHOD(device_probe, at91_rst_probe),
216 DEVMETHOD(device_attach, at91_rst_attach),
220 static driver_t at91_rst_driver = {
223 sizeof(struct at91_rst_softc),
226 static devclass_t at91_rst_devclass;
229 DRIVER_MODULE(at91_rst, simplebus, at91_rst_driver, at91_rst_devclass, NULL,
232 DRIVER_MODULE(at91_rst, atmelarm, at91_rst_driver, at91_rst_devclass, NULL,