fdt_reset.c revision 1.1.18.2
1 1.1.18.2 jdolecek /* $NetBSD: fdt_reset.c,v 1.1.18.2 2017/12/03 11:37:01 jdolecek Exp $ */ 2 1.1.18.2 jdolecek 3 1.1.18.2 jdolecek /*- 4 1.1.18.2 jdolecek * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca> 5 1.1.18.2 jdolecek * All rights reserved. 6 1.1.18.2 jdolecek * 7 1.1.18.2 jdolecek * Redistribution and use in source and binary forms, with or without 8 1.1.18.2 jdolecek * modification, are permitted provided that the following conditions 9 1.1.18.2 jdolecek * are met: 10 1.1.18.2 jdolecek * 1. Redistributions of source code must retain the above copyright 11 1.1.18.2 jdolecek * notice, this list of conditions and the following disclaimer. 12 1.1.18.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.18.2 jdolecek * notice, this list of conditions and the following disclaimer in the 14 1.1.18.2 jdolecek * documentation and/or other materials provided with the distribution. 15 1.1.18.2 jdolecek * 16 1.1.18.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.1.18.2 jdolecek * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.1.18.2 jdolecek * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.1.18.2 jdolecek * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.1.18.2 jdolecek * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.1.18.2 jdolecek * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.1.18.2 jdolecek * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.1.18.2 jdolecek * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.1.18.2 jdolecek * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.1.18.2 jdolecek * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.1.18.2 jdolecek * SUCH DAMAGE. 27 1.1.18.2 jdolecek */ 28 1.1.18.2 jdolecek 29 1.1.18.2 jdolecek #include <sys/cdefs.h> 30 1.1.18.2 jdolecek __KERNEL_RCSID(0, "$NetBSD: fdt_reset.c,v 1.1.18.2 2017/12/03 11:37:01 jdolecek Exp $"); 31 1.1.18.2 jdolecek 32 1.1.18.2 jdolecek #include <sys/param.h> 33 1.1.18.2 jdolecek #include <sys/bus.h> 34 1.1.18.2 jdolecek #include <sys/kmem.h> 35 1.1.18.2 jdolecek 36 1.1.18.2 jdolecek #include <libfdt.h> 37 1.1.18.2 jdolecek #include <dev/fdt/fdtvar.h> 38 1.1.18.2 jdolecek 39 1.1.18.2 jdolecek struct fdtbus_reset_controller { 40 1.1.18.2 jdolecek device_t rc_dev; 41 1.1.18.2 jdolecek int rc_phandle; 42 1.1.18.2 jdolecek const struct fdtbus_reset_controller_func *rc_funcs; 43 1.1.18.2 jdolecek 44 1.1.18.2 jdolecek struct fdtbus_reset_controller *rc_next; 45 1.1.18.2 jdolecek }; 46 1.1.18.2 jdolecek 47 1.1.18.2 jdolecek static struct fdtbus_reset_controller *fdtbus_rc = NULL; 48 1.1.18.2 jdolecek 49 1.1.18.2 jdolecek int 50 1.1.18.2 jdolecek fdtbus_register_reset_controller(device_t dev, int phandle, 51 1.1.18.2 jdolecek const struct fdtbus_reset_controller_func *funcs) 52 1.1.18.2 jdolecek { 53 1.1.18.2 jdolecek struct fdtbus_reset_controller *rc; 54 1.1.18.2 jdolecek 55 1.1.18.2 jdolecek rc = kmem_alloc(sizeof(*rc), KM_SLEEP); 56 1.1.18.2 jdolecek rc->rc_dev = dev; 57 1.1.18.2 jdolecek rc->rc_phandle = phandle; 58 1.1.18.2 jdolecek rc->rc_funcs = funcs; 59 1.1.18.2 jdolecek 60 1.1.18.2 jdolecek rc->rc_next = fdtbus_rc; 61 1.1.18.2 jdolecek fdtbus_rc = rc; 62 1.1.18.2 jdolecek 63 1.1.18.2 jdolecek return 0; 64 1.1.18.2 jdolecek } 65 1.1.18.2 jdolecek 66 1.1.18.2 jdolecek static struct fdtbus_reset_controller * 67 1.1.18.2 jdolecek fdtbus_get_reset_controller(int phandle) 68 1.1.18.2 jdolecek { 69 1.1.18.2 jdolecek struct fdtbus_reset_controller *rc; 70 1.1.18.2 jdolecek 71 1.1.18.2 jdolecek for (rc = fdtbus_rc; rc; rc = rc->rc_next) { 72 1.1.18.2 jdolecek if (rc->rc_phandle == phandle) { 73 1.1.18.2 jdolecek return rc; 74 1.1.18.2 jdolecek } 75 1.1.18.2 jdolecek } 76 1.1.18.2 jdolecek 77 1.1.18.2 jdolecek return NULL; 78 1.1.18.2 jdolecek } 79 1.1.18.2 jdolecek 80 1.1.18.2 jdolecek struct fdtbus_reset * 81 1.1.18.2 jdolecek fdtbus_reset_get_index(int phandle, u_int index) 82 1.1.18.2 jdolecek { 83 1.1.18.2 jdolecek struct fdtbus_reset_controller *rc; 84 1.1.18.2 jdolecek struct fdtbus_reset *rst = NULL; 85 1.1.18.2 jdolecek void *rst_priv = NULL; 86 1.1.18.2 jdolecek uint32_t *resets = NULL; 87 1.1.18.2 jdolecek uint32_t *p; 88 1.1.18.2 jdolecek u_int n, reset_cells; 89 1.1.18.2 jdolecek int len, resid; 90 1.1.18.2 jdolecek 91 1.1.18.2 jdolecek len = OF_getproplen(phandle, "resets"); 92 1.1.18.2 jdolecek if (len <= 0) 93 1.1.18.2 jdolecek return NULL; 94 1.1.18.2 jdolecek 95 1.1.18.2 jdolecek resets = kmem_alloc(len, KM_SLEEP); 96 1.1.18.2 jdolecek if (OF_getprop(phandle, "resets", resets, len) != len) { 97 1.1.18.2 jdolecek kmem_free(resets, len); 98 1.1.18.2 jdolecek return NULL; 99 1.1.18.2 jdolecek } 100 1.1.18.2 jdolecek 101 1.1.18.2 jdolecek p = resets; 102 1.1.18.2 jdolecek for (n = 0, resid = len; resid > 0; n++) { 103 1.1.18.2 jdolecek const int rc_phandle = 104 1.1.18.2 jdolecek fdtbus_get_phandle_from_native(be32toh(p[0])); 105 1.1.18.2 jdolecek if (of_getprop_uint32(rc_phandle, "#reset-cells", &reset_cells)) 106 1.1.18.2 jdolecek break; 107 1.1.18.2 jdolecek if (n == index) { 108 1.1.18.2 jdolecek rc = fdtbus_get_reset_controller(rc_phandle); 109 1.1.18.2 jdolecek if (rc == NULL) 110 1.1.18.2 jdolecek goto done; 111 1.1.18.2 jdolecek rst_priv = rc->rc_funcs->acquire(rc->rc_dev, 112 1.1.18.2 jdolecek reset_cells > 0 ? &p[1] : NULL, reset_cells * 4); 113 1.1.18.2 jdolecek if (rst_priv) { 114 1.1.18.2 jdolecek rst = kmem_alloc(sizeof(*rst), KM_SLEEP); 115 1.1.18.2 jdolecek rst->rst_rc = rc; 116 1.1.18.2 jdolecek rst->rst_priv = rst_priv; 117 1.1.18.2 jdolecek } 118 1.1.18.2 jdolecek break; 119 1.1.18.2 jdolecek } 120 1.1.18.2 jdolecek resid -= (reset_cells + 1) * 4; 121 1.1.18.2 jdolecek p += reset_cells + 1; 122 1.1.18.2 jdolecek } 123 1.1.18.2 jdolecek 124 1.1.18.2 jdolecek done: 125 1.1.18.2 jdolecek if (resets) 126 1.1.18.2 jdolecek kmem_free(resets, len); 127 1.1.18.2 jdolecek 128 1.1.18.2 jdolecek return rst; 129 1.1.18.2 jdolecek } 130 1.1.18.2 jdolecek 131 1.1.18.2 jdolecek struct fdtbus_reset * 132 1.1.18.2 jdolecek fdtbus_reset_get(int phandle, const char *rstname) 133 1.1.18.2 jdolecek { 134 1.1.18.2 jdolecek struct fdtbus_reset *rst = NULL; 135 1.1.18.2 jdolecek char *reset_names = NULL; 136 1.1.18.2 jdolecek const char *p; 137 1.1.18.2 jdolecek u_int index; 138 1.1.18.2 jdolecek int len, resid; 139 1.1.18.2 jdolecek 140 1.1.18.2 jdolecek len = OF_getproplen(phandle, "reset-names"); 141 1.1.18.2 jdolecek if (len <= 0) 142 1.1.18.2 jdolecek return NULL; 143 1.1.18.2 jdolecek 144 1.1.18.2 jdolecek reset_names = kmem_alloc(len, KM_SLEEP); 145 1.1.18.2 jdolecek if (OF_getprop(phandle, "reset-names", reset_names, len) != len) { 146 1.1.18.2 jdolecek kmem_free(reset_names, len); 147 1.1.18.2 jdolecek return NULL; 148 1.1.18.2 jdolecek } 149 1.1.18.2 jdolecek 150 1.1.18.2 jdolecek p = reset_names; 151 1.1.18.2 jdolecek for (index = 0, resid = len; resid > 0; index++) { 152 1.1.18.2 jdolecek if (strcmp(p, rstname) == 0) { 153 1.1.18.2 jdolecek rst = fdtbus_reset_get_index(phandle, index); 154 1.1.18.2 jdolecek break; 155 1.1.18.2 jdolecek } 156 1.1.18.2 jdolecek resid -= strlen(p); 157 1.1.18.2 jdolecek p += strlen(p) + 1; 158 1.1.18.2 jdolecek } 159 1.1.18.2 jdolecek 160 1.1.18.2 jdolecek if (reset_names) 161 1.1.18.2 jdolecek kmem_free(reset_names, len); 162 1.1.18.2 jdolecek 163 1.1.18.2 jdolecek return rst; 164 1.1.18.2 jdolecek } 165 1.1.18.2 jdolecek 166 1.1.18.2 jdolecek void 167 1.1.18.2 jdolecek fdtbus_reset_put(struct fdtbus_reset *rst) 168 1.1.18.2 jdolecek { 169 1.1.18.2 jdolecek struct fdtbus_reset_controller *rc = rst->rst_rc; 170 1.1.18.2 jdolecek 171 1.1.18.2 jdolecek rc->rc_funcs->release(rc->rc_dev, rst->rst_priv); 172 1.1.18.2 jdolecek kmem_free(rst, sizeof(*rst)); 173 1.1.18.2 jdolecek } 174 1.1.18.2 jdolecek 175 1.1.18.2 jdolecek int 176 1.1.18.2 jdolecek fdtbus_reset_assert(struct fdtbus_reset *rst) 177 1.1.18.2 jdolecek { 178 1.1.18.2 jdolecek struct fdtbus_reset_controller *rc = rst->rst_rc; 179 1.1.18.2 jdolecek 180 1.1.18.2 jdolecek return rc->rc_funcs->reset_assert(rc->rc_dev, rst->rst_priv); 181 1.1.18.2 jdolecek } 182 1.1.18.2 jdolecek 183 1.1.18.2 jdolecek int 184 1.1.18.2 jdolecek fdtbus_reset_deassert(struct fdtbus_reset *rst) 185 1.1.18.2 jdolecek { 186 1.1.18.2 jdolecek struct fdtbus_reset_controller *rc = rst->rst_rc; 187 1.1.18.2 jdolecek 188 1.1.18.2 jdolecek return rc->rc_funcs->reset_deassert(rc->rc_dev, rst->rst_priv); 189 1.1.18.2 jdolecek } 190
Indexes created Wed Oct 01 19:09:53 GMT 2025