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 struct arm32_dma_range * 49 bus_dma_get_range(void) 50 { 51 52 return (NULL); 53 } 54 55 int 56 bus_dma_get_range_nb(void) 57 { 58 59 return (0); 60 } 61 62 /* 63 * This code which manipulates the watchdog hardware is here to implement 64 * cpu_reset() because the watchdog is the only way for software to reset the 65 * chip. Why here and not in imx_wdog.c? Because there's no requirement that 66 * the watchdog driver be compiled in, but it's nice to be able to reboot even 67 * if it's not. 68 */ 69 void 70 imx_wdog_cpu_reset(vm_offset_t wdcr_physaddr) 71 { 72 volatile uint16_t * pcr; 73 74 /* 75 * The deceptively simple write of WDOG_CR_WDE enables the watchdog, 76 * sets the timeout to its minimum value (half a second), and also 77 * clears the SRS bit which results in the SFTW (software-requested 78 * reset) bit being set in the watchdog status register after the reset. 79 * This is how software can distinguish a reset from a wdog timeout. 80 */ 81 if ((pcr = arm_devmap_ptov(wdcr_physaddr, sizeof(*pcr))) == NULL) { 82 printf("cpu_reset() can't find its control register... locking up now."); 83 } else { 84 *pcr = WDOG_CR_WDE; 85 } 86 for (;;) 87 continue; 88 } 89 90 u_int 91 imx_soc_family(void) 92 { 93 return (imx_soc_type() >> IMXSOC_FAMSHIFT); 94 } 95 96 97