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: releng/10.3/sys/arm/freescale/imx/imx_machdep.c 294678 2016-01-24 19:34:05Z ian $");
31
32#define _ARM32_BUS_DMA_PRIVATE
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/reboot.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/devmap.h>
43#include <machine/machdep.h>
44
45#include <arm/freescale/imx/imx_machdep.h>
46#include <arm/freescale/imx/imx_wdogreg.h>
47
48SYSCTL_NODE(_hw, OID_AUTO, imx, CTLFLAG_RW, NULL, "i.MX container");
49
50static int last_reset_status;
51SYSCTL_UINT(_hw_imx, OID_AUTO, last_reset_status, CTLFLAG_RD,
52    &last_reset_status, 0, "Last reset status register");
53
54SYSCTL_STRING(_hw_imx, OID_AUTO, last_reset_reason, CTLFLAG_RD,
55    "unknown", 0, "Last reset reason");
56
57struct arm32_dma_range *
58bus_dma_get_range(void)
59{
60
61	return (NULL);
62}
63
64int
65bus_dma_get_range_nb(void)
66{
67
68	return (0);
69}
70
71/*
72 * This code which manipulates the watchdog hardware is here to implement
73 * cpu_reset() because the watchdog is the only way for software to reset the
74 * chip.  Why here and not in imx_wdog.c?  Because there's no requirement that
75 * the watchdog driver be compiled in, but it's nice to be able to reboot even
76 * if it's not.
77 */
78void
79imx_wdog_cpu_reset(vm_offset_t wdcr_physaddr)
80{
81	volatile uint16_t * pcr;
82
83	/*
84	 * Trigger an immediate reset by clearing the SRS bit in the watchdog
85	 * control register.  The reset happens on the next cycle of the wdog
86	 * 32KHz clock, so hang out in a spin loop until the reset takes effect.
87	 */
88	if ((pcr = arm_devmap_ptov(wdcr_physaddr, sizeof(*pcr))) == NULL) {
89		printf("cpu_reset() can't find its control register... locking up now.");
90	} else {
91		*pcr &= ~WDOG_CR_SRS;
92	}
93	for (;;)
94		continue;
95}
96
97void
98imx_wdog_init_last_reset(vm_offset_t wdsr_phys)
99{
100	volatile uint16_t * psr;
101
102	if ((psr = arm_devmap_ptov(wdsr_phys, sizeof(*psr))) == NULL)
103		return;
104	last_reset_status = *psr;
105	if (last_reset_status & WDOG_RSR_SFTW) {
106		sysctl___hw_imx_last_reset_reason.oid_arg1 = "SoftwareReset";
107	} else if (last_reset_status & WDOG_RSR_TOUT) {
108		sysctl___hw_imx_last_reset_reason.oid_arg1 = "WatchdogTimeout";
109	} else if (last_reset_status & WDOG_RSR_POR) {
110		sysctl___hw_imx_last_reset_reason.oid_arg1 = "PowerOnReset";
111	}
112}
113
114u_int
115imx_soc_family(void)
116{
117	return (imx_soc_type() >> IMXSOC_FAMSHIFT);
118}
119
120
121