1 /*- 2 * Copyright (c) 2014 Juergen Weiss <weiss@uni-mainz.de> 3 * Copyright (c) 2014 Ian Lepore <ian@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/lock.h> 34 #include <sys/mutex.h> 35 #include <sys/smp.h> 36 37 #include <vm/vm.h> 38 #include <vm/pmap.h> 39 40 #include <machine/cpu.h> 41 #include <machine/smp.h> 42 #include <machine/fdt.h> 43 #include <machine/intr.h> 44 45 #define SCU_PHYSBASE 0x00a00000 46 #define SCU_SIZE 0x00001000 47 48 #define SCU_CONTROL_REG 0x00 49 #define SCU_CONTROL_ENABLE (1 << 0) 50 #define SCU_CONFIG_REG 0x04 51 #define SCU_CONFIG_REG_NCPU_MASK 0x03 52 #define SCU_CPUPOWER_REG 0x08 53 #define SCU_INV_TAGS_REG 0x0c 54 #define SCU_DIAG_CONTROL 0x30 55 #define SCU_DIAG_DISABLE_MIGBIT (1 << 0) 56 #define SCU_FILTER_START_REG 0x40 57 #define SCU_FILTER_END_REG 0x44 58 #define SCU_SECURE_ACCESS_REG 0x50 59 #define SCU_NONSECURE_ACCESS_REG 0x54 60 61 #define SRC_PHYSBASE 0x020d8000 62 #define SRC_SIZE 0x4000 63 #define SRC_CONTROL_REG 0x00 64 #define SRC_CONTROL_C1ENA_SHIFT 22 /* Bit for Core 1 enable */ 65 #define SRC_CONTROL_C1RST_SHIFT 14 /* Bit for Core 1 reset */ 66 #define SRC_GPR0_C1FUNC 0x20 /* Register for Core 1 entry func */ 67 #define SRC_GPR1_C1ARG 0x24 /* Register for Core 1 entry arg */ 68 69 void 70 platform_mp_setmaxid(void) 71 { 72 bus_space_handle_t scu; 73 int hwcpu, ncpu; 74 uint32_t val; 75 76 /* If we've already set the global vars don't bother to do it again. */ 77 if (mp_ncpus != 0) 78 return; 79 80 if (bus_space_map(fdtbus_bs_tag, SCU_PHYSBASE, SCU_SIZE, 0, &scu) != 0) 81 panic("Couldn't map the SCU\n"); 82 val = bus_space_read_4(fdtbus_bs_tag, scu, SCU_CONFIG_REG); 83 hwcpu = (val & SCU_CONFIG_REG_NCPU_MASK) + 1; 84 bus_space_unmap(fdtbus_bs_tag, scu, SCU_SIZE); 85 86 ncpu = hwcpu; 87 TUNABLE_INT_FETCH("hw.ncpu", &ncpu); 88 if (ncpu < 1 || ncpu > hwcpu) 89 ncpu = hwcpu; 90 91 mp_ncpus = ncpu; 92 mp_maxid = ncpu - 1; 93 } 94 95 void 96 platform_mp_start_ap(void) 97 { 98 bus_space_handle_t scu; 99 bus_space_handle_t src; 100 101 uint32_t val; 102 int i; 103 104 if (bus_space_map(fdtbus_bs_tag, SCU_PHYSBASE, SCU_SIZE, 0, &scu) != 0) 105 panic("Couldn't map the SCU\n"); 106 if (bus_space_map(fdtbus_bs_tag, SRC_PHYSBASE, SRC_SIZE, 0, &src) != 0) 107 panic("Couldn't map the system reset controller (SRC)\n"); 108 109 /* 110 * Invalidate SCU cache tags. The 0x0000ffff constant invalidates all 111 * ways on all cores 0-3. Per the ARM docs, it's harmless to write to 112 * the bits for cores that are not present. 113 */ 114 bus_space_write_4(fdtbus_bs_tag, scu, SCU_INV_TAGS_REG, 0x0000ffff); 115 116 /* 117 * Erratum ARM/MP: 764369 (problems with cache maintenance). 118 * Setting the "disable-migratory bit" in the undocumented SCU 119 * Diagnostic Control Register helps work around the problem. 120 */ 121 val = bus_space_read_4(fdtbus_bs_tag, scu, SCU_DIAG_CONTROL); 122 bus_space_write_4(fdtbus_bs_tag, scu, SCU_DIAG_CONTROL, 123 val | SCU_DIAG_DISABLE_MIGBIT); 124 125 /* 126 * Enable the SCU, then clean the cache on this core. After these two 127 * operations the cache tag ram in the SCU is coherent with the contents 128 * of the cache on this core. The other cores aren't running yet so 129 * their caches can't contain valid data yet, but we've initialized 130 * their SCU tag ram above, so they will be coherent from startup. 131 */ 132 val = bus_space_read_4(fdtbus_bs_tag, scu, SCU_CONTROL_REG); 133 bus_space_write_4(fdtbus_bs_tag, scu, SCU_CONTROL_REG, 134 val | SCU_CONTROL_ENABLE); 135 dcache_wbinv_poc_all(); 136 137 /* 138 * For each AP core, set the entry point address and argument registers, 139 * and set the core-enable and core-reset bits in the control register. 140 */ 141 val = bus_space_read_4(fdtbus_bs_tag, src, SRC_CONTROL_REG); 142 for (i=1; i < mp_ncpus; i++) { 143 bus_space_write_4(fdtbus_bs_tag, src, SRC_GPR0_C1FUNC + 8*i, 144 pmap_kextract((vm_offset_t)mpentry)); 145 bus_space_write_4(fdtbus_bs_tag, src, SRC_GPR1_C1ARG + 8*i, 0); 146 147 val |= ((1 << (SRC_CONTROL_C1ENA_SHIFT - 1 + i )) | 148 ( 1 << (SRC_CONTROL_C1RST_SHIFT - 1 + i))); 149 150 } 151 bus_space_write_4(fdtbus_bs_tag, src, SRC_CONTROL_REG, val); 152 153 dsb(); 154 sev(); 155 156 bus_space_unmap(fdtbus_bs_tag, scu, SCU_SIZE); 157 bus_space_unmap(fdtbus_bs_tag, src, SRC_SIZE); 158 } 159