Merge branch 'stable/late-swiotlb.v3.3' into stable/for-linus-3.7
[deliverable/linux.git] / arch / arm / mach-omap2 / omap-headsmp.S
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
21 __CPUINIT
22
23 /* Physical address needed since MMU not enabled yet on secondary core */
24 #define AUX_CORE_BOOT0_PA 0x48281800
25
26 /*
27 * OMAP5 specific entry point for secondary CPU to jump from ROM
28 * code. This routine also provides a holding flag into which
29 * secondary core is held until we're ready for it to initialise.
30 * The primary core will update this flag using a hardware
31 + * register AuxCoreBoot0.
32 */
33 ENTRY(omap5_secondary_startup)
34 wait: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0
35 ldr r0, [r2]
36 mov r0, r0, lsr #5
37 mrc p15, 0, r4, c0, c0, 5
38 and r4, r4, #0x0f
39 cmp r0, r4
40 bne wait
41 b secondary_startup
42 END(omap5_secondary_startup)
43 /*
44 * OMAP4 specific entry point for secondary CPU to jump from ROM
45 * code. This routine also provides a holding flag into which
46 * secondary core is held until we're ready for it to initialise.
47 * The primary core will update this flag using a hardware
48 * register AuxCoreBoot0.
49 */
50 ENTRY(omap_secondary_startup)
51 hold: ldr r12,=0x103
52 dsb
53 smc #0 @ read from AuxCoreBoot0
54 mov r0, r0, lsr #9
55 mrc p15, 0, r4, c0, c0, 5
56 and r4, r4, #0x0f
57 cmp r0, r4
58 bne hold
59
60 /*
61 * we've been released from the wait loop,secondary_stack
62 * should now contain the SVC stack for this core
63 */
64 b secondary_startup
65 ENDPROC(omap_secondary_startup)
66
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