1/* $NetBSD: fdt_platform.c,v 1.1 2023/04/07 08:55:31 skrll Exp $ */ 2 3/*- 4 * Copyright (c) 2017 Jared D. 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_platform.c,v 1.1 2023/04/07 08:55:31 skrll Exp $"); 31 32#include <sys/param.h> 33 34#include <dev/ofw/openfirm.h> 35 36#include <dev/fdt/fdtvar.h> 37 38const struct fdt_platform * 39fdt_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 82// XXXNH remove this and rely on a default 83FDT_PLATFORM(dummy, NULL, NULL); 84