1/* 2 * Copyright (c) 2013-2015, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <arch.h> 32#include <asm_macros.S> 33#include <gic_v2.h> 34#include <platform_def.h> 35#include <v2m_def.h> 36#include "../drivers/pwrc/fvp_pwrc.h" 37#include "../fvp_def.h" 38 39 .globl plat_secondary_cold_boot_setup 40 .globl plat_get_my_entrypoint 41 .globl plat_is_my_cpu_primary 42 43 .macro fvp_choose_gicmmap param1, param2, x_tmp, w_tmp, res 44 ldr \x_tmp, =V2M_SYSREGS_BASE + V2M_SYS_ID 45 ldr \w_tmp, [\x_tmp] 46 ubfx \w_tmp, \w_tmp, #V2M_SYS_ID_BLD_SHIFT, #V2M_SYS_ID_BLD_LENGTH 47 cmp \w_tmp, #BLD_GIC_VE_MMAP 48 csel \res, \param1, \param2, eq 49 .endm 50 51 /* ----------------------------------------------------- 52 * void plat_secondary_cold_boot_setup (void); 53 * 54 * This function performs any platform specific actions 55 * needed for a secondary cpu after a cold reset e.g 56 * mark the cpu's presence, mechanism to place it in a 57 * holding pen etc. 58 * TODO: Should we read the PSYS register to make sure 59 * that the request has gone through. 60 * ----------------------------------------------------- 61 */ 62func plat_secondary_cold_boot_setup 63 /* --------------------------------------------- 64 * Power down this cpu. 65 * TODO: Do we need to worry about powering the 66 * cluster down as well here. That will need 67 * locks which we won't have unless an elf- 68 * loader zeroes out the zi section. 69 * --------------------------------------------- 70 */ 71 mrs x0, mpidr_el1 72 ldr x1, =PWRC_BASE 73 str w0, [x1, #PPOFFR_OFF] 74 75 /* --------------------------------------------- 76 * Deactivate the gic cpu interface as well 77 * --------------------------------------------- 78 */ 79 ldr x0, =VE_GICC_BASE 80 ldr x1, =BASE_GICC_BASE 81 fvp_choose_gicmmap x0, x1, x2, w2, x1 82 mov w0, #(IRQ_BYP_DIS_GRP1 | FIQ_BYP_DIS_GRP1) 83 orr w0, w0, #(IRQ_BYP_DIS_GRP0 | FIQ_BYP_DIS_GRP0) 84 str w0, [x1, #GICC_CTLR] 85 86 /* --------------------------------------------- 87 * There is no sane reason to come out of this 88 * wfi so panic if we do. This cpu will be pow- 89 * ered on and reset by the cpu_on pm api 90 * --------------------------------------------- 91 */ 92 dsb sy 93 wfi 94cb_panic: 95 b cb_panic 96endfunc plat_secondary_cold_boot_setup 97 98 /* --------------------------------------------------------------------- 99 * unsigned long plat_get_my_entrypoint (void); 100 * 101 * Main job of this routine is to distinguish between a cold and warm 102 * boot. On FVP, this information can be queried from the power 103 * controller. The Power Control SYS Status Register (PSYSR) indicates 104 * the wake-up reason for the CPU. 105 * 106 * For a cold boot, return 0. 107 * For a warm boot, read the mailbox and return the address it contains. 108 * 109 * TODO: PSYSR is a common register and should be 110 * accessed using locks. Since its not possible 111 * to use locks immediately after a cold reset 112 * we are relying on the fact that after a cold 113 * reset all cpus will read the same WK field 114 * --------------------------------------------------------------------- 115 */ 116func plat_get_my_entrypoint 117 /* --------------------------------------------------------------------- 118 * When bit PSYSR.WK indicates either "Wake by PPONR" or "Wake by GIC 119 * WakeRequest signal" then it is a warm boot. 120 * --------------------------------------------------------------------- 121 */ 122 mrs x2, mpidr_el1 123 ldr x1, =PWRC_BASE 124 str w2, [x1, #PSYSR_OFF] 125 ldr w2, [x1, #PSYSR_OFF] 126 ubfx w2, w2, #PSYSR_WK_SHIFT, #PSYSR_WK_WIDTH 127 cmp w2, #WKUP_PPONR 128 beq warm_reset 129 cmp w2, #WKUP_GICREQ 130 beq warm_reset 131 132 /* Cold reset */ 133 mov x0, #0 134 ret 135 136warm_reset: 137 /* --------------------------------------------------------------------- 138 * A mailbox is maintained in the trusted SRAM. It is flushed out of the 139 * caches after every update using normal memory so it is safe to read 140 * it here with SO attributes. 141 * --------------------------------------------------------------------- 142 */ 143 mov_imm x0, MBOX_BASE 144 ldr x0, [x0] 145 cbz x0, _panic 146 ret 147 148 /* --------------------------------------------------------------------- 149 * The power controller indicates this is a warm reset but the mailbox 150 * is empty. This should never happen! 151 * --------------------------------------------------------------------- 152 */ 153_panic: 154 b _panic 155endfunc plat_get_my_entrypoint 156 157 /* ----------------------------------------------------- 158 * unsigned int plat_is_my_cpu_primary (void); 159 * 160 * Find out whether the current cpu is the primary 161 * cpu. 162 * ----------------------------------------------------- 163 */ 164func plat_is_my_cpu_primary 165 mrs x0, mpidr_el1 166 and x0, x0, #(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK) 167 cmp x0, #FVP_PRIMARY_CPU 168 cset w0, eq 169 ret 170endfunc plat_is_my_cpu_primary 171