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453689e4 JL |
1 | /* |
2 | * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved. | |
3 | * Copyright (c) 2011, Google, Inc. | |
4 | * | |
5 | * Author: Colin Cross <ccross@android.com> | |
6 | * Gary King <gking@nvidia.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms and conditions of the GNU General Public License, | |
10 | * version 2, as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <linux/linkage.h> | |
22 | ||
23 | #include <asm/assembler.h> | |
24 | ||
453689e4 JL |
25 | #include "sleep.h" |
26 | #include "flowctrl.h" | |
27 | ||
28 | #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP) | |
29 | /* | |
30 | * tegra20_hotplug_shutdown(void) | |
31 | * | |
32 | * puts the current cpu in reset | |
33 | * should never return | |
34 | */ | |
35 | ENTRY(tegra20_hotplug_shutdown) | |
36 | /* Turn off SMP coherency */ | |
37 | exit_smp r4, r5 | |
38 | ||
39 | /* Put this CPU down */ | |
40 | cpu_id r0 | |
41 | bl tegra20_cpu_shutdown | |
42 | mov pc, lr @ should never get here | |
43 | ENDPROC(tegra20_hotplug_shutdown) | |
44 | ||
45 | /* | |
46 | * tegra20_cpu_shutdown(int cpu) | |
47 | * | |
48 | * r0 is cpu to reset | |
49 | * | |
50 | * puts the specified CPU in wait-for-event mode on the flow controller | |
51 | * and puts the CPU in reset | |
52 | * can be called on the current cpu or another cpu | |
53 | * if called on the current cpu, does not return | |
54 | * MUST NOT BE CALLED FOR CPU 0. | |
55 | * | |
56 | * corrupts r0-r3, r12 | |
57 | */ | |
58 | ENTRY(tegra20_cpu_shutdown) | |
59 | cmp r0, #0 | |
60 | moveq pc, lr @ must not be called for CPU 0 | |
61 | ||
62 | cpu_to_halt_reg r1, r0 | |
63 | ldr r3, =TEGRA_FLOW_CTRL_VIRT | |
64 | mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME | |
65 | str r2, [r3, r1] @ put flow controller in wait event mode | |
66 | ldr r2, [r3, r1] | |
67 | isb | |
68 | dsb | |
69 | movw r1, 0x1011 | |
70 | mov r1, r1, lsl r0 | |
71 | ldr r3, =TEGRA_CLK_RESET_VIRT | |
72 | str r1, [r3, #0x340] @ put slave CPU in reset | |
73 | isb | |
74 | dsb | |
75 | cpu_id r3 | |
76 | cmp r3, r0 | |
77 | beq . | |
78 | mov pc, lr | |
79 | ENDPROC(tegra20_cpu_shutdown) | |
80 | #endif |