1 /*- 2 * Copyright (c) 2022 The FreeBSD Foundation 3 * 4 * This software was developed by Andrew Turner under sponsorship from 5 * the FreeBSD Foundation. 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 /* 30 * This manages all hwresets for a device and asserts/deasserts them in 31 * an undefined order. 32 */ 33 34 #include "opt_platform.h" 35 36 #include <sys/param.h> 37 #include <sys/malloc.h> 38 39 #ifdef FDT 40 #include <dev/ofw/ofw_bus.h> 41 #include <dev/ofw/ofw_bus_subr.h> 42 #endif 43 44 #include <dev/hwreset/hwreset.h> 45 46 MALLOC_DECLARE(M_HWRESET); 47 48 struct hwreset_array { 49 hwreset_t *rst_array; 50 int count; 51 }; 52 53 int 54 hwreset_array_assert(hwreset_array_t rsts) 55 { 56 int i, rv; 57 58 for (i = 0; i < rsts->count; i++) { 59 rv = hwreset_assert(rsts->rst_array[i]); 60 if (rv != 0) 61 return (rv); 62 } 63 64 return (0); 65 } 66 67 int 68 hwreset_array_deassert(hwreset_array_t rsts) 69 { 70 int i, rv; 71 72 for (i = 0; i < rsts->count; i++) { 73 rv = hwreset_deassert(rsts->rst_array[i]); 74 if (rv != 0) 75 return (rv); 76 } 77 78 return (0); 79 } 80 81 void 82 hwreset_array_release(hwreset_array_t rsts) 83 { 84 int i; 85 86 for (i = 0; i < rsts->count; i++) { 87 hwreset_release(rsts->rst_array[i]); 88 } 89 free(rsts->rst_array, M_HWRESET); 90 free(rsts, M_HWRESET); 91 } 92 93 #ifdef FDT 94 int 95 hwreset_array_get_ofw(device_t consumer_dev, phandle_t cnode, 96 hwreset_array_t *rsts) 97 { 98 hwreset_array_t resets; 99 int count, i, rv; 100 101 if (cnode <= 0) 102 cnode = ofw_bus_get_node(consumer_dev); 103 if (cnode <= 0) { 104 device_printf(consumer_dev, 105 "%s called on not ofw based device\n", __func__); 106 return (ENXIO); 107 } 108 109 rv = ofw_bus_parse_xref_list_get_length(cnode, "resets", "#reset-cells", 110 &count); 111 if (rv != 0) 112 return (rv); 113 114 resets = malloc(sizeof(struct hwreset_array), M_HWRESET, 115 M_WAITOK | M_ZERO); 116 resets->rst_array = mallocarray(count, sizeof(hwreset_t), M_HWRESET, 117 M_WAITOK | M_ZERO); 118 119 for (i = 0; i < count; i++) { 120 rv = hwreset_get_by_ofw_idx(consumer_dev, cnode, i, 121 &resets->rst_array[i]); 122 if (rv != 0) 123 break; 124 } 125 126 if (rv != 0) { 127 count = i; 128 for (i = 0; i < count; i++) { 129 hwreset_release(resets->rst_array[i]); 130 } 131 free(resets->rst_array, M_HWRESET); 132 free(resets, M_HWRESET); 133 } else { 134 resets->count = count; 135 *rsts = resets; 136 } 137 return (rv); 138 } 139 #endif 140