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fdt_platform.c revision 1.1.8.1 
      1 /* $NetBSD: fdt_platform.c,v 1.1.8.1 2025/09/12 14:51:40 snj Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared D. 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_platform.c,v 1.1.8.1 2025/09/12 14:51:40 snj Exp $");
     31 
     32 #include <sys/param.h>
     33 
     34 #include <dev/ofw/openfirm.h>
     35 
     36 #include <dev/fdt/fdtvar.h>
     37 
     38 const struct fdt_platform *
     39 fdt_platform_find(void)
     40 {
     41 	static const struct fdt_platform_info *booted_platform = NULL;
     42 	__link_set_decl(fdt_platforms, struct fdt_platform_info);
     43 	struct fdt_platform_info * const *info;
     44 
     45 	if (booted_platform == NULL) {
     46 		const struct fdt_platform_info *best_info = NULL;
     47 		const int phandle = OF_peer(0);
     48 		int match, best_match = 0;
     49 
     50 		__link_set_foreach(info, fdt_platforms) {
     51 			const struct device_compatible_entry compat_data[] = {
     52 				{ .compat = (*info)->fpi_compat },
     53 				DEVICE_COMPAT_EOL
     54 			};
     55 
     56 			match = of_compatible_match(phandle, compat_data);
     57 			if (match > best_match) {
     58 				best_match = match;
     59 				best_info = *info;
     60 			}
     61 		}
     62 
     63 		booted_platform = best_info;
     64 	}
     65 
     66 	/*
     67 	 * No SoC specific platform was found. Try to find a generic
     68 	 * platform definition and use that if available.
     69 	 */
     70 	if (booted_platform == NULL) {
     71 		__link_set_foreach(info, fdt_platforms) {
     72 			if (strcmp((*info)->fpi_compat, FDT_PLATFORM_DEFAULT) == 0) {
     73 				booted_platform = *info;
     74 				break;
     75 			}
     76 		}
     77 	}
     78 
     79 	return booted_platform == NULL ? NULL : booted_platform->fpi_ops;
     80 }
     81