1 /* $NetBSD: fdt_dai.c,v 1.3 2018/06/30 20:34:43 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 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 ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * 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 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: fdt_dai.c,v 1.3 2018/06/30 20:34:43 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kmem.h> 35 #include <sys/queue.h> 36 37 #include <libfdt.h> 38 #include <dev/fdt/fdtvar.h> 39 40 struct fdtbus_dai_controller { 41 device_t dc_dev; 42 int dc_phandle; 43 const struct fdtbus_dai_controller_func *dc_funcs; 44 45 LIST_ENTRY(fdtbus_dai_controller) dc_next; 46 }; 47 48 static LIST_HEAD(, fdtbus_dai_controller) fdtbus_dai_controllers = 49 LIST_HEAD_INITIALIZER(fdtbus_dai_controllers); 50 51 int 52 fdtbus_register_dai_controller(device_t dev, int phandle, 53 const struct fdtbus_dai_controller_func *funcs) 54 { 55 struct fdtbus_dai_controller *dc; 56 57 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 58 dc->dc_dev = dev; 59 dc->dc_phandle = phandle; 60 dc->dc_funcs = funcs; 61 62 LIST_INSERT_HEAD(&fdtbus_dai_controllers, dc, dc_next); 63 64 return 0; 65 } 66 67 static struct fdtbus_dai_controller * 68 fdtbus_get_dai_controller(int phandle) 69 { 70 struct fdtbus_dai_controller *dc; 71 72 LIST_FOREACH(dc, &fdtbus_dai_controllers, dc_next) { 73 if (dc->dc_phandle == phandle) 74 return dc; 75 } 76 77 return NULL; 78 } 79 80 audio_dai_tag_t 81 fdtbus_dai_acquire(int phandle, const char *prop) 82 { 83 return fdtbus_dai_acquire_index(phandle, prop, 0); 84 } 85 86 audio_dai_tag_t 87 fdtbus_dai_acquire_index(int phandle, const char *prop, int index) 88 { 89 struct fdtbus_dai_controller *dc; 90 const uint32_t *dais, *p; 91 u_int n, dai_cells; 92 int len, resid; 93 94 dais = fdtbus_get_prop(phandle, prop, &len); 95 if (dais == NULL) 96 return NULL; 97 98 p = dais; 99 for (n = 0, resid = len; resid > 0; n++) { 100 const int dc_phandle = 101 fdtbus_get_phandle_from_native(be32toh(p[0])); 102 if (of_getprop_uint32(dc_phandle, "#sound-dai-cells", &dai_cells)) 103 dai_cells = 0; 104 if (n == index) { 105 dc = fdtbus_get_dai_controller(dc_phandle); 106 if (dc == NULL) 107 return NULL; 108 return dc->dc_funcs->get_tag(dc->dc_dev, 109 &p[0], (dai_cells + 1) * 4); 110 } 111 resid -= (dai_cells + 1) * 4; 112 p += dai_cells + 1; 113 } 114 115 return NULL; 116 } 117