5 files changed, 96 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index efb2f90a8f77..84d21f514418 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_CPU_IDLE)			+= sleep.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += tegra20_clocks.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += tegra20_clocks_data.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += tegra2_emc.o
+obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += sleep-t20.o
 obj-$(CONFIG_ARCH_TEGRA_3x_SOC)         += tegra30_clocks.o
 obj-$(CONFIG_ARCH_TEGRA_3x_SOC)         += tegra30_clocks_data.o
 obj-$(CONFIG_ARCH_TEGRA_3x_SOC)         += sleep-t30.o
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 06520564d815..0560538bf598 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -136,6 +136,7 @@ void __init tegra20_init_early(void)
         tegra_init_cache(0x331, 0x441);
         tegra_pmc_init();
         tegra_powergate_init();
+        tegra20_hotplug_init();
 }
 #endif
 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
diff --git a/arch/arm/mach-tegra/hotplug.c b/arch/arm/mach-tegra/hotplug.c
index be92d4c07606..d02a35476135 100644
--- a/arch/arm/mach-tegra/hotplug.c
+++ b/arch/arm/mach-tegra/hotplug.c
@@ -56,6 +56,14 @@ int platform_cpu_disable(unsigned int cpu)
         return cpu == 0 ? -EPERM : 0;
 }
 
+#ifdef CONFIG_ARCH_TEGRA_2x_SOC
+extern void tegra20_hotplug_shutdown(void);
+void __init tegra20_hotplug_init(void)
+{
+        tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
+}
+#endif
+
 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 extern void tegra30_hotplug_shutdown(void);
 void __init tegra30_hotplug_init(void)
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
diff --git a/arch/arm/mach-tegra/sleep.h b/arch/arm/mach-tegra/sleep.h
index 0f047eb3ca2e..e25a7cd703d9 100644
--- a/arch/arm/mach-tegra/sleep.h
+++ b/arch/arm/mach-tegra/sleep.h
@@ -23,6 +23,8 @@
                                         + IO_CPU_VIRT)
 #define TEGRA_FLOW_CTRL_VIRT (TEGRA_FLOW_CTRL_BASE - IO_PPSB_PHYS \
                                         + IO_PPSB_VIRT)
+#define TEGRA_CLK_RESET_VIRT (TEGRA_CLK_RESET_BASE - IO_PPSB_PHYS \
+                                        + IO_PPSB_VIRT)
 
 #ifdef __ASSEMBLY__
 /* returns the offset of the flow controller halt register for a cpu */
@@ -72,8 +74,10 @@
 #else
 
 #ifdef CONFIG_HOTPLUG_CPU
+void tegra20_hotplug_init(void);
 void tegra30_hotplug_init(void);
 #else
+static inline void tegra20_hotplug_init(void) {}
 static inline void tegra30_hotplug_init(void) {}
 #endif