97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/*-
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* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
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* 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 THE 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 THE 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 "opt_platform.h"
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define _ARM32_BUS_DMA_PRIVATE
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/reboot.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/armreg.h>
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#include <machine/bus.h>
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#include <machine/devmap.h>
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#include <machine/machdep.h>
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#include <arm/freescale/imx/imx_machdep.h>
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#include <arm/freescale/imx/imx_wdogreg.h>
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struct arm32_dma_range *
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bus_dma_get_range(void)
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{
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return (NULL);
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}
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int
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bus_dma_get_range_nb(void)
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{
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return (0);
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}
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/*
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* This code which manipulates the watchdog hardware is here to implement
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* cpu_reset() because the watchdog is the only way for software to reset the
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* chip. Why here and not in imx_wdog.c? Because there's no requirement that
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* the watchdog driver be compiled in, but it's nice to be able to reboot even
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* if it's not.
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*/
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void
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imx_wdog_cpu_reset(vm_offset_t wdcr_physaddr)
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{
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volatile uint16_t * pcr;
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/*
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* The deceptively simple write of WDOG_CR_WDE enables the watchdog,
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* sets the timeout to its minimum value (half a second), and also
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* clears the SRS bit which results in the SFTW (software-requested
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* reset) bit being set in the watchdog status register after the reset.
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* This is how software can distinguish a reset from a wdog timeout.
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*/
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if ((pcr = arm_devmap_ptov(wdcr_physaddr, sizeof(*pcr))) == NULL) {
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printf("cpu_reset() can't find its control register... locking up now.");
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} else {
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*pcr = WDOG_CR_WDE;
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}
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for (;;)
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continue;
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}
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u_int
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imx_soc_family(void)
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{
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return (imx_soc_type() >> IMXSOC_FAMSHIFT);
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}
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