1/*- 2 * Copyright (c) 2016 Stanislav Galabov 3 * Copyright (c) 2014 Ian Lepore <ian@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30#include <sys/cdefs.h> 31#include <sys/param.h> 32#include <sys/kernel.h> 33#include <sys/lock.h> 34#include <sys/mutex.h> 35#include <sys/queue.h> 36#include <sys/systm.h> 37 38#include <dev/ofw/ofw_bus.h> 39#include <dev/ofw/ofw_bus_subr.h> 40 41#include "fdt_reset_if.h" 42#include <mips/mediatek/fdt_reset.h> 43 44/* 45 * Loop through all the tuples in the resets= property for a device, asserting 46 * or deasserting each reset. 47 * 48 * Be liberal about errors for now: warn about a failure to (de)assert but keep 49 * trying with any other resets in the list. Return ENXIO if any errors were 50 * found, and let the caller decide whether the problem is fatal. 51 */ 52static int 53assert_deassert_all(device_t consumer, boolean_t assert) 54{ 55 phandle_t rnode; 56 device_t resetdev; 57 int resetnum, err, i, ncells; 58 uint32_t *resets; 59 boolean_t anyerrors; 60 61 rnode = ofw_bus_get_node(consumer); 62 ncells = OF_getencprop_alloc_multi(rnode, "resets", sizeof(*resets), 63 (void **)&resets); 64 if (!assert && ncells < 2) { 65 device_printf(consumer, "Warning: No resets specified in fdt " 66 "data; device may not function."); 67 return (ENXIO); 68 } 69 anyerrors = false; 70 for (i = 0; i < ncells; i += 2) { 71 resetdev = OF_device_from_xref(resets[i]); 72 resetnum = resets[i + 1]; 73 if (resetdev == NULL) { 74 if (!assert) 75 device_printf(consumer, "Warning: can not find " 76 "driver for reset number %u; device may " 77 "not function\n", resetnum); 78 anyerrors = true; 79 continue; 80 } 81 if (assert) 82 err = FDT_RESET_ASSERT(resetdev, resetnum); 83 else 84 err = FDT_RESET_DEASSERT(resetdev, resetnum); 85 if (err != 0) { 86 if (!assert) 87 device_printf(consumer, "Warning: failed to " 88 "deassert reset number %u; device may not " 89 "function\n", resetnum); 90 anyerrors = true; 91 } 92 } 93 OF_prop_free(resets); 94 return (anyerrors ? ENXIO : 0); 95} 96 97int 98fdt_reset_assert_all(device_t consumer) 99{ 100 101 return (assert_deassert_all(consumer, true)); 102} 103 104int 105fdt_reset_deassert_all(device_t consumer) 106{ 107 108 return (assert_deassert_all(consumer, false)); 109} 110 111void 112fdt_reset_register_provider(device_t provider) 113{ 114 115 OF_device_register_xref( 116 OF_xref_from_node(ofw_bus_get_node(provider)), provider); 117} 118 119void 120fdt_reset_unregister_provider(device_t provider) 121{ 122 123 OF_device_register_xref(OF_xref_from_device(provider), NULL); 124} 125