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.

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

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
23 * SUCH DAMAGE.
24 */
25
26#include "opt_platform.h"
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: stable/10/sys/arm/at91/at91_rst.c 266196 2014-05-15 21:21:47Z ian $");
30
31#include <sys/param.h>
32#include <sys/bus.h>
33#include <sys/kernel.h>
34#include <sys/module.h>
35#include <sys/rman.h>
36#include <sys/systm.h>
37
38#include <machine/bus.h>
39
40#include <arm/at91/at91var.h>
41#include <arm/at91/at91_rstreg.h>
42#include <arm/at91/at91board.h>
43
44#ifdef FDT
45#include <dev/fdt/fdt_common.h>
46#include <dev/ofw/ofw_bus.h>
47#include <dev/ofw/ofw_bus_subr.h>
48#define FDT_HACKS 1
49#endif
50
51#define RST_TIMEOUT (5) /* Seconds to hold NRST for hard reset */
52#define RST_TICK (20) /* sample NRST at hz/RST_TICK intervals */
53
54#ifndef FDT
55static int at91_rst_intr(void *arg);
56#endif
57
58static 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 */
63 device_t sc_dev;
64 u_int shutdown; /* Shutdown in progress */

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

99 }
100 while(1)
101 continue;
102}
103
104static int
105at91_rst_probe(device_t dev)
106{
107#ifdef FDT
108 if (!ofw_bus_is_compatible(dev, "atmel,at91sam9260-rstc"))
109 return (ENXIO);
110#endif
111
112 device_set_desc(dev, "AT91SAM9 Reset Controller");
113 return (0);
114}
115
116static int
117at91_rst_attach(device_t dev)
118{
119 struct at91_rst_softc *sc;
120 const char *cause;
121 int rid, err = 0;
122
123 at91_rst_sc = sc = device_get_softc(dev);
124 sc->sc_dev = dev;
125
126 callout_init(&sc->tick_ch, 0);
127
128 rid = 0;
129 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
130 RF_ACTIVE);
131 if (sc->mem_res == NULL) {
132 device_printf(dev, "could not allocate memory resources.\n");
133 err = ENOMEM;
134 goto out;
135 }
136
137#ifndef FDT_HACKS
138 rid = 0;
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");
143 err = ENOMEM;
144 goto out;
145 }
146
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);
150 if (err)
151 device_printf(dev, "could not establish interrupt handler.\n");
152#endif
153
154 WR4(at91_rst_sc, RST_MR, RST_MR_ERSTL(0xd) | RST_MR_URSIEN | RST_MR_KEY);
155
156 switch (RD4(sc, RST_SR) & RST_SR_RST_MASK) {
157 case RST_SR_RST_POW:
158 cause = "Power On";
159 break;
160 case RST_SR_RST_WAKE:

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

174 break;
175 }
176
177 device_printf(dev, "Reset cause: %s.\n", cause);
178out:
179 return (err);
180}
181
182#ifndef FDT_HACKS
183static void
184at91_rst_tick(void *argp)
185{
186 struct at91_rst_softc *sc = argp;
187
188 if (sc->shutdown++ >= RST_TIMEOUT * RST_TICK) {
189 /* User released the button in morre than RST_TIMEOUT */
190 cpu_reset();

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

205
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);
210 }
211 return (FILTER_STRAY);
212}
213#endif
214
215static device_method_t at91_rst_methods[] = {
216 DEVMETHOD(device_probe, at91_rst_probe),
217 DEVMETHOD(device_attach, at91_rst_attach),
218 DEVMETHOD_END
219};
220
221static driver_t at91_rst_driver = {
222 "at91_rst",
223 at91_rst_methods,
224 sizeof(struct at91_rst_softc),
225};
226
227static devclass_t at91_rst_devclass;
228
229#ifdef FDT
230DRIVER_MODULE(at91_rst, simplebus, at91_rst_driver, at91_rst_devclass, NULL,
231 NULL);
232#else
233DRIVER_MODULE(at91_rst, atmelarm, at91_rst_driver, at91_rst_devclass, NULL,
234 NULL);
235#endif