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fdt_dai.c revision 1.1 
      1 /* $NetBSD: fdt_dai.c,v 1.1 2018/05/09 23:59:05 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 1.1 2018/05/09 23:59:05 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/kmem.h>
     35 
     36 #include <libfdt.h>
     37 #include <dev/fdt/fdtvar.h>
     38 
     39 #include <dev/audio_dai.h>
     40 
     41 struct fdtbus_dai_controller {
     42 	device_t dc_dev;
     43 	int dc_phandle;
     44 	const struct fdtbus_dai_controller_func *dc_funcs;
     45 
     46 	struct fdtbus_dai_controller *dc_next;
     47 };
     48 
     49 static struct fdtbus_dai_controller *fdtbus_dc = NULL;
     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 	dc->dc_next = fdtbus_dc;
     63 	fdtbus_dc = dc;
     64 
     65 	return 0;
     66 }
     67 
     68 static struct fdtbus_dai_controller *
     69 fdtbus_get_dai_controller(int phandle)
     70 {
     71 	struct fdtbus_dai_controller *dc;
     72 
     73 	for (dc = fdtbus_dc; dc; dc = dc->dc_next) {
     74 		if (dc->dc_phandle == phandle) {
     75 			return dc;
     76 		}
     77 	}
     78 
     79 	return NULL;
     80 }
     81 
     82 audio_dai_tag_t
     83 fdtbus_dai_acquire(int phandle, const char *prop)
     84 {
     85 	return fdtbus_dai_acquire_index(phandle, prop, 0);
     86 }
     87 
     88 audio_dai_tag_t
     89 fdtbus_dai_acquire_index(int phandle, const char *prop, int index)
     90 {
     91 	struct fdtbus_dai_controller *dc;
     92 	const uint32_t *dais, *p;
     93 	u_int n, dai_cells;
     94 	int len, resid;
     95 
     96 	dais = fdtbus_get_prop(phandle, prop, &len);
     97 	if (dais == NULL)
     98 		return NULL;
     99 
    100 	p = dais;
    101 	for (n = 0, resid = len; resid > 0; n++) {
    102 		const int dc_phandle =
    103 		    fdtbus_get_phandle_from_native(be32toh(p[0]));
    104 		if (of_getprop_uint32(dc_phandle, "#sound-dai-cells", &dai_cells))
    105 			dai_cells = 0;
    106 		if (n == index) {
    107 			dc = fdtbus_get_dai_controller(dc_phandle);
    108 			if (dc == NULL)
    109 				return NULL;
    110 			return dc->dc_funcs->get_tag(dc->dc_dev,
    111 			    &p[0], (dai_cells + 1) * 4);
    112 		}
    113 		resid -= (dai_cells + 1) * 4;
    114 		p += dai_cells + 1;
    115 	}
    116 
    117 	return NULL;
    118 }
    119