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 * 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.
12 *
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
23 * SUCH DAMAGE.
24 */
25
26 #include "opt_platform.h"
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
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
55 static int at91_rst_intr(void *arg);
56 #endif
57
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 */
63 device_t sc_dev;
64 u_int shutdown; /* Shutdown in progress */
65 } *at91_rst_sc;
66
67 static inline uint32_t
RD4(struct at91_rst_softc * sc,bus_size_t off)68 RD4(struct at91_rst_softc *sc, bus_size_t off)
69 {
70
71 return (bus_read_4(sc->mem_res, off));
72 }
73
74 static inline void
WR4(struct at91_rst_softc * sc,bus_size_t off,uint32_t val)75 WR4(struct at91_rst_softc *sc, bus_size_t off, uint32_t val)
76 {
77
78 bus_write_4(sc->mem_res, off, val);
79 }
80
81 void cpu_reset_sam9g20(void) __attribute__((weak));
cpu_reset_sam9g20(void)82 void cpu_reset_sam9g20(void) {}
83
84 void
at91_rst_cpu_reset(void)85 at91_rst_cpu_reset(void)
86 {
87
88 if (at91_rst_sc) {
89 cpu_reset_sam9g20(); /* May be null */
90
91 WR4(at91_rst_sc, RST_MR,
92 RST_MR_ERSTL(0xd) | RST_MR_URSTEN | RST_MR_KEY);
93
94 WR4(at91_rst_sc, RST_CR,
95 RST_CR_PROCRST |
96 RST_CR_PERRST |
97 RST_CR_EXTRST |
98 RST_CR_KEY);
99 }
100 while(1)
101 continue;
102 }
103
104 static int
at91_rst_probe(device_t dev)105 at91_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
116 static int
at91_rst_attach(device_t dev)117 at91_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:
161 cause = "Wake Up";
162 break;
163 case RST_SR_RST_WDT:
164 cause = "Watchdog";
165 break;
166 case RST_SR_RST_SOFT:
167 cause = "Software Request";
168 break;
169 case RST_SR_RST_USR:
170 cause = "External (User)";
171 break;
172 default:
173 cause = "Unknown";
174 break;
175 }
176
177 device_printf(dev, "Reset cause: %s.\n", cause);
178 out:
179 return (err);
180 }
181
182 #ifndef FDT_HACKS
183 static void
at91_rst_tick(void * argp)184 at91_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();
191 } else if ((RD4(sc, RST_SR) & RST_SR_NRSTL)) {
192 /* User released the button in less than RST_TIMEOUT */
193 sc->shutdown = 0;
194 device_printf(sc->sc_dev, "shutting down...\n");
195 shutdown_nice(0);
196 } else {
197 callout_reset(&sc->tick_ch, hz/RST_TICK, at91_rst_tick, sc);
198 }
199 }
200
201 static int
at91_rst_intr(void * argp)202 at91_rst_intr(void *argp)
203 {
204 struct at91_rst_softc *sc = argp;
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
215 static 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
221 static driver_t at91_rst_driver = {
222 "at91_rst",
223 at91_rst_methods,
224 sizeof(struct at91_rst_softc),
225 };
226
227 static devclass_t at91_rst_devclass;
228
229 #ifdef FDT
230 DRIVER_MODULE(at91_rst, simplebus, at91_rst_driver, at91_rst_devclass, NULL,
231 NULL);
232 #else
233 DRIVER_MODULE(at91_rst, atmelarm, at91_rst_driver, at91_rst_devclass, NULL,
234 NULL);
235 #endif
236