summaryrefslogtreecommitdiff
path: root/arch/arm/mach-tegra/sleep-tegra20.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-tegra/sleep-tegra20.S')
-rw-r--r--arch/arm/mach-tegra/sleep-tegra20.S80
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/sleep-tegra20.S b/arch/arm/mach-tegra/sleep-tegra20.S
new file mode 100644
index 000000000000..72ce709799da
--- /dev/null
+++ b/arch/arm/mach-tegra/sleep-tegra20.S
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2010-2012, NVIDIA Corporation. All rights reserved.
+ * Copyright (c) 2011, Google, Inc.
+ *
+ * Author: Colin Cross <ccross@android.com>
+ * Gary King <gking@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+
+#include "sleep.h"
+#include "flowctrl.h"
+
+#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PM_SLEEP)
+/*
+ * tegra20_hotplug_shutdown(void)
+ *
+ * puts the current cpu in reset
+ * should never return
+ */
+ENTRY(tegra20_hotplug_shutdown)
+ /* Turn off SMP coherency */
+ exit_smp r4, r5
+
+ /* Put this CPU down */
+ cpu_id r0
+ bl tegra20_cpu_shutdown
+ mov pc, lr @ should never get here
+ENDPROC(tegra20_hotplug_shutdown)
+
+/*
+ * tegra20_cpu_shutdown(int cpu)
+ *
+ * r0 is cpu to reset
+ *
+ * puts the specified CPU in wait-for-event mode on the flow controller
+ * and puts the CPU in reset
+ * can be called on the current cpu or another cpu
+ * if called on the current cpu, does not return
+ * MUST NOT BE CALLED FOR CPU 0.
+ *
+ * corrupts r0-r3, r12
+ */
+ENTRY(tegra20_cpu_shutdown)
+ cmp r0, #0
+ moveq pc, lr @ must not be called for CPU 0
+
+ cpu_to_halt_reg r1, r0
+ ldr r3, =TEGRA_FLOW_CTRL_VIRT
+ mov r2, #FLOW_CTRL_WAITEVENT | FLOW_CTRL_JTAG_RESUME
+ str r2, [r3, r1] @ put flow controller in wait event mode
+ ldr r2, [r3, r1]
+ isb
+ dsb
+ movw r1, 0x1011
+ mov r1, r1, lsl r0
+ ldr r3, =TEGRA_CLK_RESET_VIRT
+ str r1, [r3, #0x340] @ put slave CPU in reset
+ isb
+ dsb
+ cpu_id r3
+ cmp r3, r0
+ beq .
+ mov pc, lr
+ENDPROC(tegra20_cpu_shutdown)
+#endif