1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Secondary CPU startup routine source file. 4 * 5 * Copyright (C) 2009-2014 Texas Instruments, Inc. 6 * 7 * Author: 8 * Santosh Shilimkar <santosh.shilimkar@ti.com> 9 * 10 * Interface functions needed for the SMP. This file is based on arm 11 * realview smp platform. 12 * Copyright (c) 2003 ARM Limited. 13 */ 14 15 #include <linux/linkage.h> 16 #include <linux/init.h> 17 #include <asm/assembler.h> 18 19 #include "omap44xx.h" 20 21 /* Physical address needed since MMU not enabled yet on secondary core */ 22 #define AUX_CORE_BOOT0_PA 0x48281800 23 #define API_HYP_ENTRY 0x102 24 25 ENTRY(omap_secondary_startup) 26 #ifdef CONFIG_SMP 27 b secondary_startup 28 #else 29 /* Should never get here */ 30 again: wfi 31 b again 32 #endif 33 #ENDPROC(omap_secondary_startup) 34 35 /* 36 * OMAP5 specific entry point for secondary CPU to jump from ROM 37 * code. This routine also provides a holding flag into which 38 * secondary core is held until we're ready for it to initialise. 39 * The primary core will update this flag using a hardware 40 * register AuxCoreBoot0. 41 */ 42 ENTRY(omap5_secondary_startup) 43 wait: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0 44 ldr r0, [r2] 45 mov r0, r0, lsr #5 46 mrc p15, 0, r4, c0, c0, 5 47 and r4, r4, #0x0f 48 cmp r0, r4 49 bne wait 50 b omap_secondary_startup 51 ENDPROC(omap5_secondary_startup) 52 /* 53 * Same as omap5_secondary_startup except we call into the ROM to 54 * enable HYP mode first. This is called instead of 55 * omap5_secondary_startup if the primary CPU was put into HYP mode by 56 * the boot loader. 57 */ 58 .arch armv7-a 59 .arch_extension sec 60 ENTRY(omap5_secondary_hyp_startup) 61 wait_2: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0 62 ldr r0, [r2] 63 mov r0, r0, lsr #5 64 mrc p15, 0, r4, c0, c0, 5 65 and r4, r4, #0x0f 66 cmp r0, r4 67 bne wait_2 68 ldr r12, =API_HYP_ENTRY 69 badr r0, hyp_boot 70 smc #0 71 hyp_boot: 72 b omap_secondary_startup 73 ENDPROC(omap5_secondary_hyp_startup) 74 /* 75 * OMAP4 specific entry point for secondary CPU to jump from ROM 76 * code. This routine also provides a holding flag into which 77 * secondary core is held until we're ready for it to initialise. 78 * The primary core will update this flag using a hardware 79 * register AuxCoreBoot0. 80 */ 81 ENTRY(omap4_secondary_startup) 82 hold: ldr r12,=0x103 83 dsb 84 smc #0 @ read from AuxCoreBoot0 85 mov r0, r0, lsr #9 86 mrc p15, 0, r4, c0, c0, 5 87 and r4, r4, #0x0f 88 cmp r0, r4 89 bne hold 90 91 /* 92 * we've been released from the wait loop,secondary_stack 93 * should now contain the SVC stack for this core 94 */ 95 b omap_secondary_startup 96 ENDPROC(omap4_secondary_startup) 97 98 ENTRY(omap4460_secondary_startup) 99 hold_2: ldr r12,=0x103 100 dsb 101 smc #0 @ read from AuxCoreBoot0 102 mov r0, r0, lsr #9 103 mrc p15, 0, r4, c0, c0, 5 104 and r4, r4, #0x0f 105 cmp r0, r4 106 bne hold_2 107 108 /* 109 * GIC distributor control register has changed between 110 * CortexA9 r1pX and r2pX. The Control Register secure 111 * banked version is now composed of 2 bits: 112 * bit 0 == Secure Enable 113 * bit 1 == Non-Secure Enable 114 * The Non-Secure banked register has not changed 115 * Because the ROM Code is based on the r1pX GIC, the CPU1 116 * GIC restoration will cause a problem to CPU0 Non-Secure SW. 117 * The workaround must be: 118 * 1) Before doing the CPU1 wakeup, CPU0 must disable 119 * the GIC distributor 120 * 2) CPU1 must re-enable the GIC distributor on 121 * it's wakeup path. 122 */ 123 ldr r1, =OMAP44XX_GIC_DIST_BASE 124 ldr r0, [r1] 125 orr r0, #1 126 str r0, [r1] 127 128 /* 129 * we've been released from the wait loop,secondary_stack 130 * should now contain the SVC stack for this core 131 */ 132 b omap_secondary_startup 133 ENDPROC(omap4460_secondary_startup)