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cpu_fdt.c revision 1.3.2.2 
      1 /* $NetBSD: cpu_fdt.c,v 1.3.2.2 2017/12/03 11:35:52 jdolecek 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 1.3.2.2 2017/12/03 11:35:52 jdolecek 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 enum cpu_fdt_type {
     46 	ARM_CPU_UP = 1,
     47 	ARM_CPU_ARMV7,
     48 	ARM_CPU_ARMV8,
     49 };
     50 
     51 struct cpu_fdt_softc {
     52 	device_t		sc_dev;
     53 	int			sc_phandle;
     54 };
     55 
     56 static const struct of_compat_data compat_data[] = {
     57 	{ "arm,arm1176jzf-s",		ARM_CPU_UP },
     58 
     59 	{ "arm,cortex-a5",		ARM_CPU_ARMV7 },
     60 	{ "arm,cortex-a7",		ARM_CPU_ARMV7 },
     61 	{ "arm,cortex-a8",		ARM_CPU_ARMV7 },
     62 	{ "arm,cortex-a9",		ARM_CPU_ARMV7 },
     63 	{ "arm,cortex-a12",		ARM_CPU_ARMV7 },
     64 	{ "arm,cortex-a15",		ARM_CPU_ARMV7 },
     65 	{ "arm,cortex-a17",		ARM_CPU_ARMV7 },
     66 
     67 	{ "arm,cortex-a53",		ARM_CPU_ARMV8 },
     68 	{ "arm,cortex-a57",		ARM_CPU_ARMV8 },
     69 	{ "arm,cortex-a72",		ARM_CPU_ARMV8 },
     70 	{ "arm,cortex-a73",		ARM_CPU_ARMV8 },
     71 	{ NULL }
     72 };
     73 
     74 CFATTACH_DECL_NEW(cpu_fdt, sizeof(struct cpu_fdt_softc),
     75 	cpu_fdt_match, cpu_fdt_attach, NULL, NULL);
     76 
     77 static int
     78 cpu_fdt_match(device_t parent, cfdata_t cf, void *aux)
     79 {
     80 	struct fdt_attach_args * const faa = aux;
     81 	const int phandle = faa->faa_phandle;
     82 	enum cpu_fdt_type type;
     83 	int is_compatible;
     84 	bus_addr_t mpidr;
     85 
     86 	is_compatible = of_match_compat_data(phandle, compat_data);
     87 	if (!is_compatible)
     88 		return 0;
     89 
     90 	type = of_search_compatible(phandle, compat_data)->data;
     91 	switch (type) {
     92 	case ARM_CPU_ARMV7:
     93 	case ARM_CPU_ARMV8:
     94 		/* XXX NetBSD requires all CPUs to be in the same cluster */
     95 		if (fdtbus_get_reg(phandle, 0, &mpidr, NULL) != 0)
     96 			return 0;
     97 		const uint32_t bp_mpidr = armreg_mpidr_read();
     98 		const u_int bp_clid = __SHIFTOUT(bp_mpidr, CORTEXA9_MPIDR_CLID);
     99 		const u_int clid = __SHIFTOUT(mpidr, CORTEXA9_MPIDR_CLID);
    100 		if (bp_clid != clid)
    101 			return 0;
    102 		break;
    103 	default:
    104 		break;
    105 	}
    106 
    107 	return is_compatible;
    108 }
    109 
    110 static void
    111 cpu_fdt_attach(device_t parent, device_t self, void *aux)
    112 {
    113 	struct cpu_fdt_softc * const sc = device_private(self);
    114 	struct fdt_attach_args * const faa = aux;
    115 	const int phandle = faa->faa_phandle;
    116 	enum cpu_fdt_type type;
    117 	bus_addr_t mpidr;
    118 	cpuid_t cpuid;
    119 
    120 	sc->sc_dev = self;
    121 	sc->sc_phandle = phandle;
    122 
    123 	type = of_search_compatible(phandle, compat_data)->data;
    124 
    125 	switch (type) {
    126 	case ARM_CPU_ARMV7:
    127 	case ARM_CPU_ARMV8:
    128 		if (fdtbus_get_reg(phandle, 0, &mpidr, NULL) != 0) {
    129 			aprint_error(": missing 'reg' property\n");
    130 			return;
    131 		}
    132 		cpuid = __SHIFTOUT(mpidr, CORTEXA9_MPIDR_CPUID);
    133 		break;
    134 	default:
    135 		cpuid = 0;
    136 		break;
    137 	}
    138 
    139 	/* Attach the CPU */
    140 	cpu_attach(self, cpuid);
    141 }
    142