2 * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
3 * Copyright (c) 2011, Google, Inc.
5 * Author: Colin Cross <ccross@android.com>
6 * Gary King <gking@nvidia.com>
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.
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
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/>.
21 #include <linux/linkage.h>
23 #include <asm/assembler.h>
28 #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
30 * tegra20_hotplug_shutdown(void)
32 * puts the current cpu in reset
35 ENTRY(tegra20_hotplug_shutdown)
36 /* Put this CPU down */
38 bl tegra20_cpu_shutdown
39 mov pc, lr @ should never get here
40 ENDPROC(tegra20_hotplug_shutdown)
43 * tegra20_cpu_shutdown(int cpu)
47 * puts the specified CPU in wait-for-event mode on the flow controller
48 * and puts the CPU in reset
49 * can be called on the current cpu or another cpu
50 * if called on the current cpu, does not return
51 * MUST NOT BE CALLED FOR CPU 0.
55 ENTRY(tegra20_cpu_shutdown)
57 moveq pc, lr @ must not be called for CPU 0
59 cpu_to_halt_reg r1, r0
60 ldr r3, =TEGRA_FLOW_CTRL_VIRT
61 mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME
62 str r2, [r3, r1] @ put flow controller in wait event mode
68 ldr r3, =TEGRA_CLK_RESET_VIRT
69 str r1, [r3, #0x340] @ put slave CPU in reset
76 ENDPROC(tegra20_cpu_shutdown)