at91_rst.c

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    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
   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
   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));
   82 void cpu_reset_sam9g20(void) {}
   83 
   84 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
  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
  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
  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
  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

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FreeBSD/Linux Kernel Cross Reference sys/arm/at91/at91_rst.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/at91/at91_rst.c