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("$FreeBSD$"); 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 48 SYSCTL_NODE(_hw, OID_AUTO, imx, CTLFLAG_RW, NULL, "i.MX container"); 49 50 static int last_reset_status; 51 SYSCTL_UINT(_hw_imx, OID_AUTO, last_reset_status, CTLFLAG_RD, 52 &last_reset_status, 0, "Last reset status register"); 53 54 SYSCTL_STRING(_hw_imx, OID_AUTO, last_reset_reason, CTLFLAG_RD, 55 "unknown", 0, "Last reset reason"); 56 57 struct arm32_dma_range * 58 bus_dma_get_range(void) 59 { 60 61 return (NULL); 62 } 63 64 int 65 bus_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 */ 78 void 79 imx_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 97 void 98 imx_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 } 113 114 u_int 115 imx_soc_family(void) 116 { 117 return (imx_soc_type() >> IMXSOC_FAMSHIFT); 118 } 119 120 121