83 lines
2.1 KiB
ArmAsm
83 lines
2.1 KiB
ArmAsm
/*
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* Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
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* Copyright (c) 2011, Google, Inc.
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*
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* Author: Colin Cross <ccross@android.com>
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* Gary King <gking@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <mach/iomap.h>
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#include "sleep.h"
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#include "flowctrl.h"
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#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
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/*
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* tegra20_hotplug_shutdown(void)
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*
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* puts the current cpu in reset
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* should never return
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*/
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ENTRY(tegra20_hotplug_shutdown)
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/* Turn off SMP coherency */
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exit_smp r4, r5
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/* Put this CPU down */
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cpu_id r0
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bl tegra20_cpu_shutdown
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mov pc, lr @ should never get here
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ENDPROC(tegra20_hotplug_shutdown)
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/*
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* tegra20_cpu_shutdown(int cpu)
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*
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* r0 is cpu to reset
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*
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* puts the specified CPU in wait-for-event mode on the flow controller
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* and puts the CPU in reset
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* can be called on the current cpu or another cpu
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* if called on the current cpu, does not return
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* MUST NOT BE CALLED FOR CPU 0.
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*
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* corrupts r0-r3, r12
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*/
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ENTRY(tegra20_cpu_shutdown)
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cmp r0, #0
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moveq pc, lr @ must not be called for CPU 0
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cpu_to_halt_reg r1, r0
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ldr r3, =TEGRA_FLOW_CTRL_VIRT
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mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME
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str r2, [r3, r1] @ put flow controller in wait event mode
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ldr r2, [r3, r1]
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isb
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dsb
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movw r1, 0x1011
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mov r1, r1, lsl r0
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ldr r3, =TEGRA_CLK_RESET_VIRT
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str r1, [r3, #0x340] @ put slave CPU in reset
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isb
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dsb
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cpu_id r3
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cmp r3, r0
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beq .
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mov pc, lr
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ENDPROC(tegra20_cpu_shutdown)
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#endif
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