1 /* $NetBSD: fdt_mbox.c,v 1.1 2022/03/04 08:19:06 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2022 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nick Hudson 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: fdt_mbox.c,v 1.1 2022/03/04 08:19:06 skrll Exp $"); 34 35 #include <sys/param.h> 36 37 #include <sys/bus.h> 38 #include <sys/kmem.h> 39 #include <sys/queue.h> 40 41 #include <libfdt.h> 42 #include <dev/fdt/fdtvar.h> 43 44 45 struct fdtbus_mbox_controller { 46 device_t mc_dev; 47 int mc_phandle; 48 49 int mc_cells; 50 51 const struct fdtbus_mbox_controller_func *mc_funcs; 52 53 LIST_ENTRY(fdtbus_mbox_controller) mc_next; 54 }; 55 56 static LIST_HEAD(, fdtbus_mbox_controller) fdtbus_mbox_controllers = 57 LIST_HEAD_INITIALIZER(fdtbus_mbox_controllers); 58 59 int 60 fdtbus_register_mbox_controller(device_t dev, int phandle, 61 const struct fdtbus_mbox_controller_func *funcs) 62 { 63 struct fdtbus_mbox_controller *mc; 64 65 uint32_t cells; 66 if (of_getprop_uint32(phandle, "#mbox-cells", &cells) != 0) { 67 aprint_debug_dev(dev, "missing #mbox-cells"); 68 return EINVAL; 69 } 70 71 mc = kmem_alloc(sizeof(*mc), KM_SLEEP); 72 mc->mc_dev = dev; 73 mc->mc_phandle = phandle; 74 mc->mc_funcs = funcs; 75 mc->mc_cells = cells; 76 77 LIST_INSERT_HEAD(&fdtbus_mbox_controllers, mc, mc_next); 78 79 return 0; 80 } 81 82 static struct fdtbus_mbox_controller * 83 fdtbus_mbox_lookup(int phandle) 84 { 85 struct fdtbus_mbox_controller *mc; 86 87 LIST_FOREACH(mc, &fdtbus_mbox_controllers, mc_next) { 88 if (mc->mc_phandle == phandle) 89 return mc; 90 } 91 92 return NULL; 93 } 94 95 struct fdtbus_mbox_channel * 96 fdtbus_mbox_get_index(int phandle, u_int index, void (*cb)(void *), void *cbarg) 97 { 98 struct fdtbus_mbox_controller *mc; 99 struct fdtbus_mbox_channel *mbox = NULL; 100 void *mbox_priv = NULL; 101 uint32_t *mboxes = NULL; 102 uint32_t *p; 103 u_int n; 104 int len, resid; 105 106 len = OF_getproplen(phandle, "mboxes"); 107 if (len <= 0) 108 return NULL; 109 110 mboxes = kmem_alloc(len, KM_SLEEP); 111 if (OF_getprop(phandle, "mboxes", mboxes, len) != len) { 112 kmem_free(mboxes, len); 113 return NULL; 114 } 115 116 p = mboxes; 117 for (n = 0, resid = len; resid > 0; n++) { 118 const int mc_phandle = 119 fdtbus_get_phandle_from_native(be32toh(p[0])); 120 121 mc = fdtbus_mbox_lookup(mc_phandle); 122 if (mc == NULL) 123 break; 124 125 u_int mbox_cells = mc->mc_cells; 126 if (n == index) { 127 mbox_priv = mc->mc_funcs->mc_acquire(mc->mc_dev, 128 mbox_cells > 0 ? &p[1] : NULL, mbox_cells * 4, 129 cb, cbarg); 130 if (mbox_priv) { 131 mbox = kmem_alloc(sizeof(*mbox), KM_SLEEP); 132 mbox->mb_ctlr = mc; 133 mbox->mb_priv = mbox_priv; 134 } 135 break; 136 } 137 resid -= (mbox_cells + 1) * 4; 138 p += mbox_cells + 1; 139 } 140 141 if (mboxes) 142 kmem_free(mboxes, len); 143 144 return mbox; 145 } 146 147 struct fdtbus_mbox_channel * 148 fdtbus_mbox_get(int phandle, const char *name, void (*cb)(void *), void *cbarg) 149 { 150 u_int index; 151 int err; 152 153 err = fdtbus_get_index(phandle, "mbox-names", name, &index); 154 if (err != 0) 155 return NULL; 156 157 return fdtbus_mbox_get_index(phandle, index, cb, cbarg); 158 } 159 160 void 161 fdtbus_mbox_put(struct fdtbus_mbox_channel *mbox) 162 { 163 struct fdtbus_mbox_controller *mc = mbox->mb_ctlr; 164 165 mc->mc_funcs->mc_release(mc->mc_dev, mbox->mb_priv); 166 kmem_free(mbox, sizeof(*mbox)); 167 } 168 169 int 170 fdtbus_mbox_send(struct fdtbus_mbox_channel *mbox, const void *data, size_t len) 171 { 172 struct fdtbus_mbox_controller * const mc = mbox->mb_ctlr; 173 174 return mc->mc_funcs->mc_send(mc->mc_dev, mbox->mb_priv, data, len); 175 } 176 177 int 178 fdtbus_mbox_recv(struct fdtbus_mbox_channel *mbox, void *data, size_t len) 179 { 180 struct fdtbus_mbox_controller * const mc = mbox->mb_ctlr; 181 182 return mc->mc_funcs->mc_recv(mc->mc_dev, mbox->mb_priv, data, len); 183 } 184
Indexes created Wed Sep 24 05:09:52 GMT 2025