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cpu_fdt.c revision 1.1 
      1 /* $NetBSD: cpu_fdt.c,v 1.1 2023/05/07 12:41:48 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 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 "opt_multiprocessor.h"
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: cpu_fdt.c,v 1.1 2023/05/07 12:41:48 skrll Exp $");
     33 
     34 #include <sys/param.h>
     35 
     36 #include <dev/fdt/fdtvar.h>
     37 
     38 #include <riscv/cpuvar.h>
     39 
     40 static int
     41 cpu_fdt_match(device_t parent, cfdata_t cf, void *aux)
     42 {
     43 	struct fdt_attach_args * const faa = aux;
     44 	const int phandle = faa->faa_phandle;
     45 	const char *device_type;
     46 
     47 	device_type = fdtbus_get_string(phandle, "device_type");
     48 	return device_type != NULL && strcmp(device_type, "cpu") == 0;
     49 }
     50 
     51 static void
     52 cpu_fdt_attach(device_t parent, device_t self, void *aux)
     53 {
     54 	struct fdt_attach_args * const faa = aux;
     55 	const int phandle = faa->faa_phandle;
     56 	bus_addr_t cpuid;
     57 
     58 	if (fdtbus_get_reg(phandle, 0, &cpuid, NULL) != 0)
     59 		cpuid = 0;
     60 
     61 	/* Attach the CPU */
     62 	cpu_attach(self, cpuid);
     63 
     64 	fdt_add_bus(self, phandle, faa);
     65 }
     66 
     67 CFATTACH_DECL_NEW(cpu_fdt, 0, cpu_fdt_match, cpu_fdt_attach, NULL, NULL);
     68