2010-10-06 22:25:21 +00:00
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/*-
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* Copyright (c) 2010 Greg Ansley. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <sys/systm.h>
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#include <machine/bus.h>
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#include <arm/at91/at91var.h>
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#include <arm/at91/at91_rstreg.h>
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#include <arm/at91/at91board.h>
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#define RST_TIMEOUT (5) /* Seconds to hold NRST for hard reset */
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#define RST_TICK (20) /* sample NRST at hz/RST_TICK intervals */
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static int rst_intr(void *arg);
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static struct rst_softc {
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struct resource *mem_res; /* Memory resource */
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struct resource *irq_res; /* IRQ resource */
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void *intrhand; /* Interrupt handle */
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struct callout tick_ch; /* Tick callout */
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device_t sc_dev;
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u_int shutdown; /* Shutdown in progress */
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} *rst_sc;
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static inline uint32_t
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RD4(struct rst_softc *sc, bus_size_t off)
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{
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return (bus_read_4(sc->mem_res, off));
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}
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static inline void
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WR4(struct rst_softc *sc, bus_size_t off, uint32_t val)
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{
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bus_write_4(sc->mem_res, off, val);
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}
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static int
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at91_rst_probe(device_t dev)
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{
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if (at91_is_sam9()) {
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device_set_desc(dev, "AT91SAM9 Reset Controller");
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return (0);
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}
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return (ENXIO);
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}
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static int
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at91_rst_attach(device_t dev)
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{
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struct rst_softc *sc;
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const char *cause;
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int rid, err;
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rst_sc = sc = device_get_softc(dev);
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sc->sc_dev = dev;
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callout_init(&sc->tick_ch, 0);
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rid = 0;
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (sc->mem_res == NULL) {
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device_printf(dev, "could not allocate memory resources.\n");
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err = ENOMEM;
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goto out;
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}
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rid = 0;
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sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
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RF_ACTIVE | RF_SHAREABLE);
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if (sc->irq_res == NULL) {
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device_printf(dev, "could not allocate interrupt resources.\n");
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err = ENOMEM;
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goto out;
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}
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/* Activate the interrupt. */
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err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
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rst_intr, NULL, sc, &sc->intrhand);
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if (err)
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device_printf(dev, "could not establish interrupt handler.\n");
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WR4(rst_sc, RST_MR, RST_MR_ERSTL(0xd) | RST_MR_URSIEN | RST_MR_KEY);
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switch (RD4(sc, RST_SR) & RST_SR_RST_MASK) {
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case RST_SR_RST_POW:
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cause = "Power On";
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break;
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case RST_SR_RST_WAKE:
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cause = "Wake Up";
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break;
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case RST_SR_RST_WDT:
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cause = "Watchdog";
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break;
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case RST_SR_RST_SOFT:
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cause = "Software Request";
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break;
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case RST_SR_RST_USR:
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cause = "External (User)";
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break;
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default:
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cause = "Unknown";
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break;
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}
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device_printf(dev, "Reset cause: %s.\n", cause);
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/* cpu_reset_addr = cpu_reset; */
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out:
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return (err);
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}
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static void
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rst_tick(void *argp)
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{
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struct rst_softc *sc = argp;
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if (sc->shutdown++ >= RST_TIMEOUT * RST_TICK) {
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/* User released the button in morre than RST_TIMEOUT */
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cpu_reset();
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} else if ((RD4(sc, RST_SR) & RST_SR_NRSTL)) {
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/* User released the button in less than RST_TIMEOUT */
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sc->shutdown = 0;
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device_printf(sc->sc_dev, "shutting down...\n");
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shutdown_nice(0);
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} else {
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callout_reset(&sc->tick_ch, hz/RST_TICK, rst_tick, sc);
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}
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}
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static int
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rst_intr(void *argp)
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{
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struct rst_softc *sc = argp;
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if (RD4(sc, RST_SR) & RST_SR_URSTS) {
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if (sc->shutdown == 0)
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callout_reset(&sc->tick_ch, hz/RST_TICK, rst_tick, sc);
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return (FILTER_HANDLED);
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}
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return (FILTER_STRAY);
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}
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static device_method_t at91_rst_methods[] = {
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DEVMETHOD(device_probe, at91_rst_probe),
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DEVMETHOD(device_attach, at91_rst_attach),
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{0,0},
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};
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static driver_t at91_rst_driver = {
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"at91_rst",
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at91_rst_methods,
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sizeof(struct rst_softc),
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};
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static devclass_t at91_rst_devclass;
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DRIVER_MODULE(at91_rst, atmelarm, at91_rst_driver, at91_rst_devclass, 0, 0);
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void cpu_reset_sam9g20(void) __attribute__((weak));
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void cpu_reset_sam9g20(void) {}
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void
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cpu_reset(void)
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{
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if (rst_sc) {
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2010-10-06 22:40:27 +00:00
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cpu_reset_sam9g20(); /* May be null */
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2010-10-06 22:25:21 +00:00
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WR4(rst_sc, RST_MR,
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RST_MR_ERSTL(0xd) | RST_MR_URSTEN | RST_MR_KEY);
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WR4(rst_sc, RST_CR,
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RST_CR_PROCRST |
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RST_CR_PERRST |
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RST_CR_EXTRST |
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RST_CR_KEY);
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}
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for(;;) ;
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}
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