2 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include "opt_platform.h"
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #define _ARM32_BUS_DMA_PRIVATE
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/reboot.h>
40 #include <machine/armreg.h>
41 #include <machine/bus.h>
42 #include <machine/devmap.h>
43 #include <machine/machdep.h>
45 #include <arm/freescale/imx/imx_machdep.h>
46 #include <arm/freescale/imx/imx_wdogreg.h>
48 struct arm32_dma_range *
49 bus_dma_get_range(void)
56 bus_dma_get_range_nb(void)
63 * This code which manipulates the watchdog hardware is here to implement
64 * cpu_reset() because the watchdog is the only way for software to reset the
65 * chip. Why here and not in imx_wdog.c? Because there's no requirement that
66 * the watchdog driver be compiled in, but it's nice to be able to reboot even
70 imx_wdog_cpu_reset(vm_offset_t wdcr_physaddr)
72 volatile uint16_t * pcr;
75 * The deceptively simple write of WDOG_CR_WDE enables the watchdog,
76 * sets the timeout to its minimum value (half a second), and also
77 * clears the SRS bit which results in the SFTW (software-requested
78 * reset) bit being set in the watchdog status register after the reset.
79 * This is how software can distinguish a reset from a wdog timeout.
81 if ((pcr = arm_devmap_ptov(wdcr_physaddr, sizeof(*pcr))) == NULL) {
82 printf("cpu_reset() can't find its control register... locking up now.");
93 return (imx_soc_type() >> IMXSOC_FAMSHIFT);