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      1 /* $NetBSD: cpus_fdt.c,v 1.1 2023/06/12 12:58:17 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2023 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Nick Hudson
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: cpus_fdt.c,v 1.1 2023/06/12 12:58:17 skrll Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/types.h>
     37 
     38 #include <dev/fdt/fdtvar.h>
     39 
     40 #include <machine/machdep.h>
     41 
     42 void
     43 fdtbus_cpus_md_attach(device_t parent, device_t self, void *aux)
     44 {
     45 	struct fdt_attach_args * const faa = aux;
     46 	const int cpus = faa->faa_phandle;
     47 
     48 	uint32_t tbfreq;
     49 	int ret = of_getprop_uint32(cpus, "timebase-frequency", &tbfreq);
     50 	if (ret < 0) {
     51 		aprint_error(": can't get timebase frequency\n");
     52 		return;
     53 	}
     54 	riscv_timer_frequency_set(tbfreq);
     55 }
     56