| /* |
| * Secondary CPU startup routine source file. |
| * |
| * Copyright (C) 2009 Texas Instruments, Inc. |
| * |
| * Author: |
| * Santosh Shilimkar <santosh.shilimkar@ti.com> |
| * |
| * Interface functions needed for the SMP. This file is based on arm |
| * realview smp platform. |
| * Copyright (c) 2003 ARM Limited. |
| * |
| * This program is free software,you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/linkage.h> |
| #include <linux/init.h> |
| |
| #include "omap44xx.h" |
| |
| __CPUINIT |
| |
| /* Physical address needed since MMU not enabled yet on secondary core */ |
| #define AUX_CORE_BOOT0_PA 0x48281800 |
| |
| /* |
| * OMAP5 specific entry point for secondary CPU to jump from ROM |
| * code. This routine also provides a holding flag into which |
| * secondary core is held until we're ready for it to initialise. |
| * The primary core will update this flag using a hardware |
| + * register AuxCoreBoot0. |
| */ |
| ENTRY(omap5_secondary_startup) |
| wait: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0 |
| ldr r0, [r2] |
| mov r0, r0, lsr #5 |
| mrc p15, 0, r4, c0, c0, 5 |
| and r4, r4, #0x0f |
| cmp r0, r4 |
| bne wait |
| b secondary_startup |
| END(omap5_secondary_startup) |
| /* |
| * OMAP4 specific entry point for secondary CPU to jump from ROM |
| * code. This routine also provides a holding flag into which |
| * secondary core is held until we're ready for it to initialise. |
| * The primary core will update this flag using a hardware |
| * register AuxCoreBoot0. |
| */ |
| ENTRY(omap_secondary_startup) |
| hold: ldr r12,=0x103 |
| dsb |
| smc #0 @ read from AuxCoreBoot0 |
| mov r0, r0, lsr #9 |
| mrc p15, 0, r4, c0, c0, 5 |
| and r4, r4, #0x0f |
| cmp r0, r4 |
| bne hold |
| |
| /* |
| * we've been released from the wait loop,secondary_stack |
| * should now contain the SVC stack for this core |
| */ |
| b secondary_startup |
| ENDPROC(omap_secondary_startup) |
| |
| ENTRY(omap_secondary_startup_4460) |
| hold_2: ldr r12,=0x103 |
| dsb |
| smc #0 @ read from AuxCoreBoot0 |
| mov r0, r0, lsr #9 |
| mrc p15, 0, r4, c0, c0, 5 |
| and r4, r4, #0x0f |
| cmp r0, r4 |
| bne hold_2 |
| |
| /* |
| * GIC distributor control register has changed between |
| * CortexA9 r1pX and r2pX. The Control Register secure |
| * banked version is now composed of 2 bits: |
| * bit 0 == Secure Enable |
| * bit 1 == Non-Secure Enable |
| * The Non-Secure banked register has not changed |
| * Because the ROM Code is based on the r1pX GIC, the CPU1 |
| * GIC restoration will cause a problem to CPU0 Non-Secure SW. |
| * The workaround must be: |
| * 1) Before doing the CPU1 wakeup, CPU0 must disable |
| * the GIC distributor |
| * 2) CPU1 must re-enable the GIC distributor on |
| * it's wakeup path. |
| */ |
| ldr r1, =OMAP44XX_GIC_DIST_BASE |
| ldr r0, [r1] |
| orr r0, #1 |
| str r0, [r1] |
| |
| /* |
| * we've been released from the wait loop,secondary_stack |
| * should now contain the SVC stack for this core |
| */ |
| b secondary_startup |
| ENDPROC(omap_secondary_startup_4460) |
