zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/kernel/suspend.c b/ap/os/linux/linux-3.4.x/arch/arm/kernel/suspend.c
new file mode 100644
index 0000000..1794cc3
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/arch/arm/kernel/suspend.c
@@ -0,0 +1,60 @@
+#include <linux/init.h>
+
+#include <asm/idmap.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/memory.h>
+#include <asm/suspend.h>
+#include <asm/tlbflush.h>
+
+extern int __cpu_suspend(unsigned long, int (*)(unsigned long));
+extern void cpu_resume_mmu(void);
+
+/*
+ * This is called by __cpu_suspend() to save the state, and do whatever
+ * flushing is required to ensure that when the CPU goes to sleep we have
+ * the necessary data available when the caches are not searched.
+ */
+void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
+{
+ *save_ptr = virt_to_phys(ptr);
+
+ /* This must correspond to the LDM in cpu_resume() assembly */
+ *ptr++ = virt_to_phys(idmap_pgd);
+ *ptr++ = sp;
+ *ptr++ = virt_to_phys(cpu_do_resume);
+
+ cpu_do_suspend(ptr);
+
+ flush_cache_all();
+ outer_clean_range(*save_ptr, *save_ptr + ptrsz);
+ outer_clean_range(virt_to_phys(save_ptr),
+ virt_to_phys(save_ptr) + sizeof(*save_ptr));
+}
+
+/*
+ * Hide the first two arguments to __cpu_suspend - these are an implementation
+ * detail which platform code shouldn't have to know about.
+ */
+int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
+{
+ struct mm_struct *mm = current->active_mm;
+ int ret;
+
+ if (!idmap_pgd)
+ return -EINVAL;
+
+ /*
+ * Provide a temporary page table with an identity mapping for
+ * the MMU-enable code, required for resuming. On successful
+ * resume (indicated by a zero return code), we need to switch
+ * back to the correct page tables.
+ */
+ ret = __cpu_suspend(arg, fn);
+ if (ret == 0) {
+ cpu_switch_mm(mm->pgd, mm);
+ local_flush_tlb_all();
+ }
+
+ return ret;
+}