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 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/reboot.h>
35 #include <sys/devmap.h>
40 #include <machine/armreg.h>
41 #include <machine/bus.h>
42 #include <machine/machdep.h>
44 #include <arm/freescale/imx/imx_machdep.h>
45 #include <arm/freescale/imx/imx_wdogreg.h>
47 SYSCTL_NODE(_hw, OID_AUTO, imx, CTLFLAG_RW, NULL, "i.MX container");
49 static int last_reset_status;
50 SYSCTL_UINT(_hw_imx, OID_AUTO, last_reset_status, CTLFLAG_RD,
51 &last_reset_status, 0, "Last reset status register");
53 SYSCTL_STRING(_hw_imx, OID_AUTO, last_reset_reason, CTLFLAG_RD,
54 "unknown", 0, "Last reset reason");
57 * This code which manipulates the watchdog hardware is here to implement
58 * cpu_reset() because the watchdog is the only way for software to reset the
59 * chip. Why here and not in imx_wdog.c? Because there's no requirement that
60 * the watchdog driver be compiled in, but it's nice to be able to reboot even
64 imx_wdog_cpu_reset(vm_offset_t wdcr_physaddr)
66 volatile uint16_t * pcr;
69 * Trigger an immediate reset by clearing the SRS bit in the watchdog
70 * control register. The reset happens on the next cycle of the wdog
71 * 32KHz clock, so hang out in a spin loop until the reset takes effect.
73 * Imx6 erratum ERR004346 says the SRS bit has to be cleared twice
74 * within the same cycle of the 32khz clock to reliably trigger the
75 * reset. Writing it 3 times in a row ensures at least 2 of the writes
76 * happen in the same 32k clock cycle.
78 if ((pcr = devmap_ptov(wdcr_physaddr, sizeof(*pcr))) == NULL) {
79 printf("cpu_reset() can't find its control register... locking up now.");
90 imx_wdog_init_last_reset(vm_offset_t wdsr_phys)
92 volatile uint16_t * psr;
94 if ((psr = devmap_ptov(wdsr_phys, sizeof(*psr))) == NULL)
96 last_reset_status = *psr;
97 if (last_reset_status & WDOG_RSR_SFTW) {
98 sysctl___hw_imx_last_reset_reason.oid_arg1 = "SoftwareReset";
99 } else if (last_reset_status & WDOG_RSR_TOUT) {
100 sysctl___hw_imx_last_reset_reason.oid_arg1 = "WatchdogTimeout";
101 } else if (last_reset_status & WDOG_RSR_POR) {
102 sysctl___hw_imx_last_reset_reason.oid_arg1 = "PowerOnReset";
109 return (imx_soc_type() >> IMXSOC_FAMSHIFT);