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      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 (at) 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