1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Secondary CPU startup routine source file.
5 * Copyright (C) 2009-2014 Texas Instruments, Inc.
8 * Santosh Shilimkar <santosh.shilimkar@ti.com>
10 * Interface functions needed for the SMP. This file is based on arm
11 * realview smp platform.
12 * Copyright (c) 2003 ARM Limited.
15 #include <linux/linkage.h>
16 #include <linux/init.h>
17 #include <asm/assembler.h>
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
25 ENTRY(omap_secondary_startup)
29 /* Should never get here */
33 #ENDPROC(omap_secondary_startup)
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.
42 ENTRY(omap5_secondary_startup)
43 wait: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0
46 mrc p15, 0, r4, c0, c0, 5
50 b omap_secondary_startup
51 ENDPROC(omap5_secondary_startup)
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
60 ENTRY(omap5_secondary_hyp_startup)
61 wait_2: ldr r2, =AUX_CORE_BOOT0_PA @ read from AuxCoreBoot0
64 mrc p15, 0, r4, c0, c0, 5
68 ldr r12, =API_HYP_ENTRY
72 b omap_secondary_startup
73 ENDPROC(omap5_secondary_hyp_startup)
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.
81 ENTRY(omap4_secondary_startup)
84 smc #0 @ read from AuxCoreBoot0
86 mrc p15, 0, r4, c0, c0, 5
92 * we've been released from the wait loop,secondary_stack
93 * should now contain the SVC stack for this core
95 b omap_secondary_startup
96 ENDPROC(omap4_secondary_startup)
98 ENTRY(omap4460_secondary_startup)
99 hold_2: ldr r12,=0x103
101 smc #0 @ read from AuxCoreBoot0
103 mrc p15, 0, r4, c0, c0, 5
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
123 ldr r1, =OMAP44XX_GIC_DIST_BASE
129 * we've been released from the wait loop,secondary_stack
130 * should now contain the SVC stack for this core
132 b omap_secondary_startup
133 ENDPROC(omap4460_secondary_startup)