imx_machdep.c revision 314506 
1/*-
2 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27#include "opt_platform.h"
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/sys/arm/freescale/imx/imx_machdep.c 314506 2017-03-01 19:55:04Z ian $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/reboot.h>
35#include <sys/devmap.h>
36
37#include <vm/vm.h>
38#include <vm/pmap.h>
39
40#include <machine/armreg.h>
41#include <machine/bus.h>
42#include <machine/machdep.h>
43
44#include <arm/freescale/imx/imx_machdep.h>
45#include <arm/freescale/imx/imx_wdogreg.h>
46
47SYSCTL_NODE(_hw, OID_AUTO, imx, CTLFLAG_RW, NULL, "i.MX container");
48
49static int last_reset_status;
50SYSCTL_UINT(_hw_imx, OID_AUTO, last_reset_status, CTLFLAG_RD,
51    &last_reset_status, 0, "Last reset status register");
52
53SYSCTL_STRING(_hw_imx, OID_AUTO, last_reset_reason, CTLFLAG_RD,
54    "unknown", 0, "Last reset reason");
55
56/*
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
61 * if it's not.
62 */
63void
64imx_wdog_cpu_reset(vm_offset_t wdcr_physaddr)
65{
66	volatile uint16_t * pcr;
67
68	/*
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.
72	 */
73	if ((pcr = devmap_ptov(wdcr_physaddr, sizeof(*pcr))) == NULL) {
74		printf("cpu_reset() can't find its control register... locking up now.");
75	} else {
76		*pcr &= ~WDOG_CR_SRS;
77	}
78	for (;;)
79		continue;
80}
81
82void
83imx_wdog_init_last_reset(vm_offset_t wdsr_phys)
84{
85	volatile uint16_t * psr;
86
87	if ((psr = devmap_ptov(wdsr_phys, sizeof(*psr))) == NULL)
88		return;
89	last_reset_status = *psr;
90	if (last_reset_status & WDOG_RSR_SFTW) {
91		sysctl___hw_imx_last_reset_reason.oid_arg1 = "SoftwareReset";
92	} else if (last_reset_status & WDOG_RSR_TOUT) {
93		sysctl___hw_imx_last_reset_reason.oid_arg1 = "WatchdogTimeout";
94	} else if (last_reset_status & WDOG_RSR_POR) {
95		sysctl___hw_imx_last_reset_reason.oid_arg1 = "PowerOnReset";
96	}
97}
98
99u_int
100imx_soc_family(void)
101{
102	return (imx_soc_type() >> IMXSOC_FAMSHIFT);
103}
104
105
106