1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include "opt_platform.h" 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/reboot.h> 37 #include <sys/devmap.h> 38 39 #include <vm/vm.h> 40 #include <vm/pmap.h> 41 42 #include <machine/armreg.h> 43 #include <machine/bus.h> 44 #include <machine/machdep.h> 45 46 #include <arm/freescale/imx/imx_machdep.h> 47 #include <arm/freescale/imx/imx_wdogreg.h> 48 49 SYSCTL_NODE(_hw, OID_AUTO, imx, CTLFLAG_RW, NULL, "i.MX container"); 50 51 static int last_reset_status; 52 SYSCTL_UINT(_hw_imx, OID_AUTO, last_reset_status, CTLFLAG_RD, 53 &last_reset_status, 0, "Last reset status register"); 54 55 SYSCTL_STRING(_hw_imx, OID_AUTO, last_reset_reason, CTLFLAG_RD, 56 "unknown", 0, "Last reset reason"); 57 58 /* 59 * This code which manipulates the watchdog hardware is here to implement 60 * cpu_reset() because the watchdog is the only way for software to reset the 61 * chip. Why here and not in imx_wdog.c? Because there's no requirement that 62 * the watchdog driver be compiled in, but it's nice to be able to reboot even 63 * if it's not. 64 */ 65 void 66 imx_wdog_cpu_reset(vm_offset_t wdcr_physaddr) 67 { 68 volatile uint16_t * pcr; 69 70 /* 71 * Trigger an immediate reset by clearing the SRS bit in the watchdog 72 * control register. The reset happens on the next cycle of the wdog 73 * 32KHz clock, so hang out in a spin loop until the reset takes effect. 74 * 75 * Imx6 erratum ERR004346 says the SRS bit has to be cleared twice 76 * within the same cycle of the 32khz clock to reliably trigger the 77 * reset. Writing it 3 times in a row ensures at least 2 of the writes 78 * happen in the same 32k clock cycle. 79 */ 80 if ((pcr = devmap_ptov(wdcr_physaddr, sizeof(*pcr))) == NULL) { 81 printf("cpu_reset() can't find its control register... locking up now."); 82 } else { 83 *pcr &= ~WDOG_CR_SRS; 84 *pcr &= ~WDOG_CR_SRS; 85 *pcr &= ~WDOG_CR_SRS; 86 } 87 for (;;) 88 continue; 89 } 90 91 void 92 imx_wdog_init_last_reset(vm_offset_t wdsr_phys) 93 { 94 volatile uint16_t * psr; 95 96 if ((psr = devmap_ptov(wdsr_phys, sizeof(*psr))) == NULL) 97 return; 98 last_reset_status = *psr; 99 if (last_reset_status & WDOG_RSR_SFTW) { 100 sysctl___hw_imx_last_reset_reason.oid_arg1 = "SoftwareReset"; 101 } else if (last_reset_status & WDOG_RSR_TOUT) { 102 sysctl___hw_imx_last_reset_reason.oid_arg1 = "WatchdogTimeout"; 103 } else if (last_reset_status & WDOG_RSR_POR) { 104 sysctl___hw_imx_last_reset_reason.oid_arg1 = "PowerOnReset"; 105 } 106 } 107 108 u_int 109 imx_soc_family(void) 110 { 111 return (imx_soc_type() >> IMXSOC_FAMSHIFT); 112 } 113 114 115