1 files changed, 82 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/sleep-t20.S b/arch/arm/mach-tegra/sleep-t20.S
new file mode 100644
index 000000000000..a36ae413e2b8
--- /dev/null
+++ b/arch/arm/mach-tegra/sleep-t20.S
@@ -0,0 +1,82 @@
+/*
+ * 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 <mach/iomap.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