projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 367cd31e SS |
1 | /* |
| 2 | * Secondary CPU startup routine source file. | |
| 3 | * | |
| 4 | * Copyright (C) 2009 Texas Instruments, Inc. | |
| 5 | * | |
| 6 | * Author: | |
| 7 | * Santosh Shilimkar <santosh.shilimkar@ti.com> | |
| 8 | * | |
| 9 | * Interface functions needed for the SMP. This file is based on arm | |
| 10 | * realview smp platform. | |
| 11 | * Copyright (c) 2003 ARM Limited. | |
| 12 | * | |
| 13 | * This program is free software,you can redistribute it and/or modify | |
| 14 | * it under the terms of the GNU General Public License version 2 as | |
| 15 | * published by the Free Software Foundation. | |
| 16 | */ | |
| 17 | ||
| 18 | #include <linux/linkage.h> | |
| 19 | #include <linux/init.h> | |
| 20 | ||
| ff999b8a SS |
21 | #include "omap44xx.h" |
| 22 | ||
| 45176f4c | 23 | __CPUINIT |
| 283f708c SS |
24 | |
| 25 | /* Physical address needed since MMU not enabled yet on secondary core */ | |
| 26 | #define AUX_CORE_BOOT0_PA 0x48281800 | |
| 27 | ||
| 28 | /* | |
| 29 | * OMAP5 specific entry point for secondary CPU to jump from ROM | |
| 30 | * code. This routine also provides a holding flag into which | |
| 31 | * secondary core is held until we're ready for it to initialise. | |
| 32 | * The primary core will update this flag using a hardware | |
| 33 | + * register AuxCoreBoot0. | |
| 34 | */ | |
| 35 | ENTRY(omap5_secondary_startup) | |
| 36 | wait: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0 | |
| 37 | ldr r0, [r2] | |
| 38 | mov r0, r0, lsr #5 | |
| 39 | mrc p15, 0, r4, c0, c0, 5 | |
| 40 | and r4, r4, #0x0f | |
| 41 | cmp r0, r4 | |
| 42 | bne wait | |
| 43 | b secondary_startup | |
| 44 | END(omap5_secondary_startup) | |
| 367cd31e SS |
45 | /* |
| 46 | * OMAP4 specific entry point for secondary CPU to jump from ROM | |
| 47 | * code. This routine also provides a holding flag into which | |
| 48 | * secondary core is held until we're ready for it to initialise. | |
| 942e2c9e SS |
49 | * The primary core will update this flag using a hardware |
| 50 | * register AuxCoreBoot0. | |
| 367cd31e SS |
51 | */ |
| 52 | ENTRY(omap_secondary_startup) | |
| 942e2c9e SS |
53 | hold: ldr r12,=0x103 |
| 54 | dsb | |
| df571c4a | 55 | smc #0 @ read from AuxCoreBoot0 |
| 942e2c9e SS |
56 | mov r0, r0, lsr #9 |
| 57 | mrc p15, 0, r4, c0, c0, 5 | |
| 58 | and r4, r4, #0x0f | |
| 59 | cmp r0, r4 | |
| 367cd31e SS |
60 | bne hold |
| 61 | ||
| 62 | /* | |
| 942e2c9e | 63 | * we've been released from the wait loop,secondary_stack |
| 367cd31e SS |
64 | * should now contain the SVC stack for this core |
| 65 | */ | |
| 66 | b secondary_startup | |
| f96bdfa0 | 67 | ENDPROC(omap_secondary_startup) |
| 367cd31e | 68 | |
| ff999b8a SS |
69 | ENTRY(omap_secondary_startup_4460) |
| 70 | hold_2: ldr r12,=0x103 | |
| 71 | dsb | |
| 72 | smc #0 @ read from AuxCoreBoot0 | |
| 73 | mov r0, r0, lsr #9 | |
| 74 | mrc p15, 0, r4, c0, c0, 5 | |
| 75 | and r4, r4, #0x0f | |
| 76 | cmp r0, r4 | |
| 77 | bne hold_2 | |
| 78 | ||
| 79 | /* | |
| 80 | * GIC distributor control register has changed between | |
| 81 | * CortexA9 r1pX and r2pX. The Control Register secure | |
| 82 | * banked version is now composed of 2 bits: | |
| 83 | * bit 0 == Secure Enable | |
| 84 | * bit 1 == Non-Secure Enable | |
| 85 | * The Non-Secure banked register has not changed | |
| 86 | * Because the ROM Code is based on the r1pX GIC, the CPU1 | |
| 87 | * GIC restoration will cause a problem to CPU0 Non-Secure SW. | |
| 88 | * The workaround must be: | |
| 89 | * 1) Before doing the CPU1 wakeup, CPU0 must disable | |
| 90 | * the GIC distributor | |
| 91 | * 2) CPU1 must re-enable the GIC distributor on | |
| 92 | * it's wakeup path. | |
| 93 | */ | |
| 94 | ldr r1, =OMAP44XX_GIC_DIST_BASE | |
| 95 | ldr r0, [r1] | |
| 96 | orr r0, #1 | |
| 97 | str r0, [r1] | |
| 98 | ||
| 99 | /* | |
| 100 | * we've been released from the wait loop,secondary_stack | |
| 101 | * should now contain the SVC stack for this core | |
| 102 | */ | |
| 103 | b secondary_startup | |
| 104 | ENDPROC(omap_secondary_startup_4460) |