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cpu_fdt.c revision 1.2.4.2 
      1 /* $NetBSD: cpu_fdt.c,v 1.2.4.2 2017/08/28 17:51:30 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 <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: cpu_fdt.c,v 1.2.4.2 2017/08/28 17:51:30 skrll Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/device.h>
     35 #include <sys/systm.h>
     36 #include <sys/kernel.h>
     37 
     38 #include <dev/fdt/fdtvar.h>
     39 
     40 #include <arm/cpu.h>
     41 
     42 static int	cpu_fdt_match(device_t, cfdata_t, void *);
     43 static void	cpu_fdt_attach(device_t, device_t, void *);
     44 
     45 struct cpu_fdt_softc {
     46 	device_t		sc_dev;
     47 	int			sc_phandle;
     48 };
     49 
     50 CFATTACH_DECL_NEW(cpu_fdt, sizeof(struct cpu_fdt_softc),
     51 	cpu_fdt_match, cpu_fdt_attach, NULL, NULL);
     52 
     53 static int
     54 cpu_fdt_match(device_t parent, cfdata_t cf, void *aux)
     55 {
     56 	const char * const compatible[] = {
     57 		"arm,cortex-a5",
     58 		"arm,cortex-a7",
     59 		"arm,cortex-a8",
     60 		"arm,cortex-a9",
     61 		"arm,cortex-a12",
     62 		"arm,cortex-a15",
     63 		"arm,cortex-a17",
     64 		"arm,cortex-a53",
     65 		"arm,cortex-a57",
     66 		"arm,cortex-a72",
     67 		"arm,cortex-a73",
     68 		NULL
     69 	};
     70 	struct fdt_attach_args * const faa = aux;
     71 	int is_compatible;
     72 	bus_addr_t mpidr;
     73 
     74 	is_compatible = of_match_compatible(faa->faa_phandle, compatible);
     75 	if (!is_compatible)
     76 		return 0;
     77 
     78 	/* XXX NetBSD requires all CPUs to be in the same cluster */
     79 	if (fdtbus_get_reg(faa->faa_phandle, 0, &mpidr, NULL) != 0)
     80 		return 0;
     81 	const uint32_t bp_mpidr = armreg_mpidr_read();
     82 	const u_int bp_clid = __SHIFTOUT(bp_mpidr, CORTEXA9_MPIDR_CLID);
     83 	const u_int clid = __SHIFTOUT(mpidr, CORTEXA9_MPIDR_CLID);
     84 	if (bp_clid != clid)
     85 		return 0;
     86 
     87 	return is_compatible;
     88 }
     89 
     90 static void
     91 cpu_fdt_attach(device_t parent, device_t self, void *aux)
     92 {
     93 	struct cpu_fdt_softc * const sc = device_private(self);
     94 	struct fdt_attach_args * const faa = aux;
     95 	bus_addr_t mpidr;
     96 
     97 	sc->sc_dev = self;
     98 	sc->sc_phandle = faa->faa_phandle;
     99 
    100 	if (fdtbus_get_reg(sc->sc_phandle, 0, &mpidr, NULL) != 0) {
    101 		aprint_error(": missing 'reg' property\n");
    102 		return;
    103 	}
    104 
    105 	/* Attach the CPU */
    106 	cpu_attach(self, __SHIFTOUT(mpidr, CORTEXA9_MPIDR_CPUID));
    107 }
    108