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
25ENTRY(omap_secondary_startup)
26#ifdef CONFIG_SMP
27 b secondary_startup
28#else
29/* Should never get here */
30again: 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 */
42ENTRY(omap5_secondary_startup)
43wait: 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
51ENDPROC(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
60ENTRY(omap5_secondary_hyp_startup)
61wait_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
71hyp_boot:
72 b omap_secondary_startup
73ENDPROC(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 */
81ENTRY(omap4_secondary_startup)
82hold: 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
96ENDPROC(omap4_secondary_startup)
97
98ENTRY(omap4460_secondary_startup)
99hold_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
133ENDPROC(omap4460_secondary_startup)
134

source code of linux/arch/arm/mach-omap2/omap-headsmp.S