108 lines
2.7 KiB
ArmAsm
108 lines
2.7 KiB
ArmAsm
/*
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* Copyright (c) 2012, NVIDIA Corporation. All rights reserved.
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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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#define TEGRA30_POWER_HOTPLUG_SHUTDOWN (1 << 27) /* Hotplug shutdown */
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#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
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/*
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* tegra30_hotplug_shutdown(void)
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*
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* Powergates the current CPU.
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* Should never return.
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*/
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ENTRY(tegra30_hotplug_shutdown)
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/* Turn off SMP coherency */
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exit_smp r4, r5
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/* Powergate this CPU */
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mov r0, #TEGRA30_POWER_HOTPLUG_SHUTDOWN
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bl tegra30_cpu_shutdown
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mov pc, lr @ should never get here
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ENDPROC(tegra30_hotplug_shutdown)
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/*
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* tegra30_cpu_shutdown(unsigned long flags)
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*
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* Puts the current CPU in wait-for-event mode on the flow controller
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* and powergates it -- flags (in R0) indicate the request type.
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* Must never be called for CPU 0.
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*
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* corrupts r0-r4, r12
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*/
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ENTRY(tegra30_cpu_shutdown)
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cpu_id r3
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cmp r3, #0
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moveq pc, lr @ Must never be called for CPU 0
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ldr r12, =TEGRA_FLOW_CTRL_VIRT
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cpu_to_csr_reg r1, r3
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add r1, r1, r12 @ virtual CSR address for this CPU
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cpu_to_halt_reg r2, r3
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add r2, r2, r12 @ virtual HALT_EVENTS address for this CPU
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/*
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* Clear this CPU's "event" and "interrupt" flags and power gate
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* it when halting but not before it is in the "WFE" state.
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*/
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movw r12, \
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FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG | \
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FLOW_CTRL_CSR_ENABLE
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mov r4, #(1 << 4)
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orr r12, r12, r4, lsl r3
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str r12, [r1]
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/* Halt this CPU. */
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mov r3, #0x400
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delay_1:
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subs r3, r3, #1 @ delay as a part of wfe war.
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bge delay_1;
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cpsid a @ disable imprecise aborts.
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ldr r3, [r1] @ read CSR
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str r3, [r1] @ clear CSR
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tst r0, #TEGRA30_POWER_HOTPLUG_SHUTDOWN
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movne r3, #FLOW_CTRL_WAITEVENT @ For hotplug
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str r3, [r2]
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ldr r0, [r2]
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b wfe_war
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__cpu_reset_again:
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dsb
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.align 5
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wfe @ CPU should be power gated here
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wfe_war:
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b __cpu_reset_again
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/*
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* 38 nop's, which fills reset of wfe cache line and
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* 4 more cachelines with nop
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*/
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.rept 38
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nop
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.endr
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b . @ should never get here
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ENDPROC(tegra30_cpu_shutdown)
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#endif
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