1 /* $NetBSD: cpu_fdt.c,v 1.4 2017/12/10 21:38:26 skrll 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 1.4 2017/12/10 21:38:26 skrll 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/cpu.h> 42 43 static int cpu_fdt_match(device_t, cfdata_t, void *); 44 static void cpu_fdt_attach(device_t, device_t, void *); 45 46 enum cpu_fdt_type { 47 ARM_CPU_UP = 1, 48 ARM_CPU_ARMV7, 49 ARM_CPU_ARMV8, 50 }; 51 52 struct cpu_fdt_softc { 53 device_t sc_dev; 54 int sc_phandle; 55 }; 56 57 static const struct of_compat_data compat_data[] = { 58 { "arm,arm1176jzf-s", ARM_CPU_UP }, 59 60 { "arm,cortex-a5", ARM_CPU_ARMV7 }, 61 { "arm,cortex-a7", ARM_CPU_ARMV7 }, 62 { "arm,cortex-a8", ARM_CPU_ARMV7 }, 63 { "arm,cortex-a9", ARM_CPU_ARMV7 }, 64 { "arm,cortex-a12", ARM_CPU_ARMV7 }, 65 { "arm,cortex-a15", ARM_CPU_ARMV7 }, 66 { "arm,cortex-a17", ARM_CPU_ARMV7 }, 67 68 { "arm,cortex-a53", ARM_CPU_ARMV8 }, 69 { "arm,cortex-a57", ARM_CPU_ARMV8 }, 70 { "arm,cortex-a72", ARM_CPU_ARMV8 }, 71 { "arm,cortex-a73", ARM_CPU_ARMV8 }, 72 { NULL } 73 }; 74 75 CFATTACH_DECL_NEW(cpu_fdt, sizeof(struct cpu_fdt_softc), 76 cpu_fdt_match, cpu_fdt_attach, NULL, NULL); 77 78 static int 79 cpu_fdt_match(device_t parent, cfdata_t cf, void *aux) 80 { 81 struct fdt_attach_args * const faa = aux; 82 const int phandle = faa->faa_phandle; 83 enum cpu_fdt_type type; 84 int is_compatible; 85 bus_addr_t mpidr; 86 87 is_compatible = of_match_compat_data(phandle, compat_data); 88 if (!is_compatible) 89 return 0; 90 91 type = of_search_compatible(phandle, compat_data)->data; 92 switch (type) { 93 case ARM_CPU_ARMV7: 94 case ARM_CPU_ARMV8: 95 /* XXX NetBSD requires all CPUs to be in the same cluster */ 96 if (fdtbus_get_reg(phandle, 0, &mpidr, NULL) != 0) 97 return 0; 98 const uint32_t bp_mpidr = armreg_mpidr_read(); 99 const u_int bp_clid = __SHIFTOUT(bp_mpidr, CORTEXA9_MPIDR_CLID); 100 const u_int clid = __SHIFTOUT(mpidr, CORTEXA9_MPIDR_CLID); 101 if (bp_clid != clid) 102 return 0; 103 break; 104 default: 105 break; 106 } 107 108 return is_compatible; 109 } 110 111 static void 112 cpu_fdt_attach(device_t parent, device_t self, void *aux) 113 { 114 struct cpu_fdt_softc * const sc = device_private(self); 115 struct fdt_attach_args * const faa = aux; 116 const int phandle = faa->faa_phandle; 117 enum cpu_fdt_type type; 118 bus_addr_t mpidr; 119 cpuid_t cpuid; 120 121 sc->sc_dev = self; 122 sc->sc_phandle = phandle; 123 124 type = of_search_compatible(phandle, compat_data)->data; 125 126 switch (type) { 127 case ARM_CPU_ARMV7: 128 case ARM_CPU_ARMV8: 129 if (fdtbus_get_reg(phandle, 0, &mpidr, NULL) != 0) { 130 aprint_error(": missing 'reg' property\n"); 131 return; 132 } 133 cpuid = __SHIFTOUT(mpidr, CORTEXA9_MPIDR_CPUID); 134 break; 135 default: 136 cpuid = 0; 137 break; 138 } 139 140 /* Attach the CPU */ 141 cpu_attach(self, cpuid); 142 } 143