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at91_rst.c (213498) at91_rst.c (234281)
1/*-
2 * Copyright (c) 2010 Greg Ansley. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.

--- 10 unchanged lines hidden (view full) ---

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
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 2010 Greg Ansley. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.

--- 10 unchanged lines hidden (view full) ---

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
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: head/sys/arm/at91/at91_rst.c 213498 2010-10-06 22:40:27Z cognet $");
27__FBSDID("$FreeBSD: head/sys/arm/at91/at91_rst.c 234281 2012-04-14 11:29:32Z marius $");
28
29#include <sys/param.h>
30#include <sys/bus.h>
31#include <sys/kernel.h>
32#include <sys/module.h>
33#include <sys/rman.h>
34#include <sys/systm.h>
35
36#include <machine/bus.h>
37
38#include <arm/at91/at91var.h>
39#include <arm/at91/at91_rstreg.h>
40#include <arm/at91/at91board.h>
41
42#define RST_TIMEOUT (5) /* Seconds to hold NRST for hard reset */
28
29#include <sys/param.h>
30#include <sys/bus.h>
31#include <sys/kernel.h>
32#include <sys/module.h>
33#include <sys/rman.h>
34#include <sys/systm.h>
35
36#include <machine/bus.h>
37
38#include <arm/at91/at91var.h>
39#include <arm/at91/at91_rstreg.h>
40#include <arm/at91/at91board.h>
41
42#define RST_TIMEOUT (5) /* Seconds to hold NRST for hard reset */
43#define RST_TICK (20) /* sample NRST at hz/RST_TICK intervals */
43#define RST_TICK (20) /* sample NRST at hz/RST_TICK intervals */
44
45static int rst_intr(void *arg);
46
47static struct rst_softc {
48 struct resource *mem_res; /* Memory resource */
49 struct resource *irq_res; /* IRQ resource */
50 void *intrhand; /* Interrupt handle */
51 struct callout tick_ch; /* Tick callout */

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117
118 switch (RD4(sc, RST_SR) & RST_SR_RST_MASK) {
119 case RST_SR_RST_POW:
120 cause = "Power On";
121 break;
122 case RST_SR_RST_WAKE:
123 cause = "Wake Up";
124 break;
44
45static int rst_intr(void *arg);
46
47static struct rst_softc {
48 struct resource *mem_res; /* Memory resource */
49 struct resource *irq_res; /* IRQ resource */
50 void *intrhand; /* Interrupt handle */
51 struct callout tick_ch; /* Tick callout */

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117
118 switch (RD4(sc, RST_SR) & RST_SR_RST_MASK) {
119 case RST_SR_RST_POW:
120 cause = "Power On";
121 break;
122 case RST_SR_RST_WAKE:
123 cause = "Wake Up";
124 break;
125 case RST_SR_RST_WDT:
125 case RST_SR_RST_WDT:
126 cause = "Watchdog";
127 break;
128 case RST_SR_RST_SOFT:
129 cause = "Software Request";
130 break;
131 case RST_SR_RST_USR:
132 cause = "External (User)";
133 break;

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148{
149 struct rst_softc *sc = argp;
150
151 if (sc->shutdown++ >= RST_TIMEOUT * RST_TICK) {
152 /* User released the button in morre than RST_TIMEOUT */
153 cpu_reset();
154 } else if ((RD4(sc, RST_SR) & RST_SR_NRSTL)) {
155 /* User released the button in less than RST_TIMEOUT */
126 cause = "Watchdog";
127 break;
128 case RST_SR_RST_SOFT:
129 cause = "Software Request";
130 break;
131 case RST_SR_RST_USR:
132 cause = "External (User)";
133 break;

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148{
149 struct rst_softc *sc = argp;
150
151 if (sc->shutdown++ >= RST_TIMEOUT * RST_TICK) {
152 /* User released the button in morre than RST_TIMEOUT */
153 cpu_reset();
154 } else if ((RD4(sc, RST_SR) & RST_SR_NRSTL)) {
155 /* User released the button in less than RST_TIMEOUT */
156 sc->shutdown = 0;
156 sc->shutdown = 0;
157 device_printf(sc->sc_dev, "shutting down...\n");
158 shutdown_nice(0);
159 } else {
160 callout_reset(&sc->tick_ch, hz/RST_TICK, rst_tick, sc);
161 }
162}
163
164static int
165rst_intr(void *argp)
166{
167 struct rst_softc *sc = argp;
168
169 if (RD4(sc, RST_SR) & RST_SR_URSTS) {
157 device_printf(sc->sc_dev, "shutting down...\n");
158 shutdown_nice(0);
159 } else {
160 callout_reset(&sc->tick_ch, hz/RST_TICK, rst_tick, sc);
161 }
162}
163
164static int
165rst_intr(void *argp)
166{
167 struct rst_softc *sc = argp;
168
169 if (RD4(sc, RST_SR) & RST_SR_URSTS) {
170 if (sc->shutdown == 0)
170 if (sc->shutdown == 0)
171 callout_reset(&sc->tick_ch, hz/RST_TICK, rst_tick, sc);
172 return (FILTER_HANDLED);
173 }
174 return (FILTER_STRAY);
175}
176
177static device_method_t at91_rst_methods[] = {
178 DEVMETHOD(device_probe, at91_rst_probe),
179 DEVMETHOD(device_attach, at91_rst_attach),
171 callout_reset(&sc->tick_ch, hz/RST_TICK, rst_tick, sc);
172 return (FILTER_HANDLED);
173 }
174 return (FILTER_STRAY);
175}
176
177static device_method_t at91_rst_methods[] = {
178 DEVMETHOD(device_probe, at91_rst_probe),
179 DEVMETHOD(device_attach, at91_rst_attach),
180 {0,0},
180 DEVMETHOD_END
181};
182
183static driver_t at91_rst_driver = {
184 "at91_rst",
185 at91_rst_methods,
186 sizeof(struct rst_softc),
187};
188
189static devclass_t at91_rst_devclass;
190
181};
182
183static driver_t at91_rst_driver = {
184 "at91_rst",
185 at91_rst_methods,
186 sizeof(struct rst_softc),
187};
188
189static devclass_t at91_rst_devclass;
190
191DRIVER_MODULE(at91_rst, atmelarm, at91_rst_driver, at91_rst_devclass, 0, 0);
191DRIVER_MODULE(at91_rst, atmelarm, at91_rst_driver, at91_rst_devclass, NULL,
192 NULL);
192
193void cpu_reset_sam9g20(void) __attribute__((weak));
194void cpu_reset_sam9g20(void) {}
195
196void
197cpu_reset(void)
198{
199
200 if (rst_sc) {
193
194void cpu_reset_sam9g20(void) __attribute__((weak));
195void cpu_reset_sam9g20(void) {}
196
197void
198cpu_reset(void)
199{
200
201 if (rst_sc) {
201
202 cpu_reset_sam9g20(); /* May be null */
203
204 WR4(rst_sc, RST_MR,
205 RST_MR_ERSTL(0xd) | RST_MR_URSTEN | RST_MR_KEY);
206
207 WR4(rst_sc, RST_CR,
208 RST_CR_PROCRST |
209 RST_CR_PERRST |
210 RST_CR_EXTRST |
211 RST_CR_KEY);
212 }
213
202 cpu_reset_sam9g20(); /* May be null */
203
204 WR4(rst_sc, RST_MR,
205 RST_MR_ERSTL(0xd) | RST_MR_URSTEN | RST_MR_KEY);
206
207 WR4(rst_sc, RST_CR,
208 RST_CR_PROCRST |
209 RST_CR_PERRST |
210 RST_CR_EXTRST |
211 RST_CR_KEY);
212 }
213
214 for(;;) ;
214 for(;;)
215 ;
215}
216}