1 /* $NetBSD: cpu_fdt.c,v 1.5 2018/04/01 04:35:04 ryo Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared 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: cpu_fdt.c,v 1.5 2018/04/01 04:35:04 ryo Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/lwp.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 39 #include <dev/fdt/fdtvar.h> 40 41 #include <arm/armreg.h> 42 #include <arm/cpu.h> 43 #include <arm/cpufunc.h> 44 45 static int cpu_fdt_match(device_t, cfdata_t, void *); 46 static void cpu_fdt_attach(device_t, device_t, void *); 47 48 enum cpu_fdt_type { 49 ARM_CPU_UP = 1, 50 ARM_CPU_ARMV7, 51 ARM_CPU_ARMV8, 52 }; 53 54 struct cpu_fdt_softc { 55 device_t sc_dev; 56 int sc_phandle; 57 }; 58 59 static const struct of_compat_data compat_data[] = { 60 { "arm,arm1176jzf-s", ARM_CPU_UP }, 61 62 { "arm,cortex-a5", ARM_CPU_ARMV7 }, 63 { "arm,cortex-a7", ARM_CPU_ARMV7 }, 64 { "arm,cortex-a8", ARM_CPU_ARMV7 }, 65 { "arm,cortex-a9", ARM_CPU_ARMV7 }, 66 { "arm,cortex-a12", ARM_CPU_ARMV7 }, 67 { "arm,cortex-a15", ARM_CPU_ARMV7 }, 68 { "arm,cortex-a17", ARM_CPU_ARMV7 }, 69 70 { "arm,cortex-a53", ARM_CPU_ARMV8 }, 71 { "arm,cortex-a57", ARM_CPU_ARMV8 }, 72 { "arm,cortex-a72", ARM_CPU_ARMV8 }, 73 { "arm,cortex-a73", ARM_CPU_ARMV8 }, 74 { NULL } 75 }; 76 77 CFATTACH_DECL_NEW(cpu_fdt, sizeof(struct cpu_fdt_softc), 78 cpu_fdt_match, cpu_fdt_attach, NULL, NULL); 79 80 static int 81 cpu_fdt_match(device_t parent, cfdata_t cf, void *aux) 82 { 83 struct fdt_attach_args * const faa = aux; 84 const int phandle = faa->faa_phandle; 85 enum cpu_fdt_type type; 86 int is_compatible; 87 bus_addr_t mpidr; 88 89 is_compatible = of_match_compat_data(phandle, compat_data); 90 if (!is_compatible) 91 return 0; 92 93 type = of_search_compatible(phandle, compat_data)->data; 94 switch (type) { 95 case ARM_CPU_ARMV7: 96 case ARM_CPU_ARMV8: 97 /* XXX NetBSD requires all CPUs to be in the same cluster */ 98 if (fdtbus_get_reg(phandle, 0, &mpidr, NULL) != 0) 99 return 0; 100 101 const u_int bp_clid = cpu_clusterid(); 102 const u_int clid = __SHIFTOUT(mpidr, MPIDR_AFF1); 103 104 if (bp_clid != clid) 105 return 0; 106 break; 107 default: 108 break; 109 } 110 111 return is_compatible; 112 } 113 114 static void 115 cpu_fdt_attach(device_t parent, device_t self, void *aux) 116 { 117 struct cpu_fdt_softc * const sc = device_private(self); 118 struct fdt_attach_args * const faa = aux; 119 const int phandle = faa->faa_phandle; 120 enum cpu_fdt_type type; 121 bus_addr_t mpidr; 122 cpuid_t cpuid; 123 124 sc->sc_dev = self; 125 sc->sc_phandle = phandle; 126 127 type = of_search_compatible(phandle, compat_data)->data; 128 129 switch (type) { 130 case ARM_CPU_ARMV7: 131 case ARM_CPU_ARMV8: 132 if (fdtbus_get_reg(phandle, 0, &mpidr, NULL) != 0) { 133 aprint_error(": missing 'reg' property\n"); 134 return; 135 } 136 137 cpuid = __SHIFTOUT(mpidr, MPIDR_AFF0); 138 break; 139 default: 140 cpuid = 0; 141 break; 142 } 143 144 /* Attach the CPU */ 145 cpu_attach(self, cpuid); 146 } 147