1 /* $NetBSD: cpu_fdt.c,v 1.3 2017/09/18 16:58:04 jmcneill 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 1.3 2017/09/18 16:58:04 jmcneill 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