1 files changed, 72 insertions, 0 deletions

diff --git a/arch/arm/kernel/suspend.c b/arch/arm/kernel/suspend.c
new file mode 100644
index 000000000000..93a22d282c16
--- /dev/null
+++ b/arch/arm/kernel/suspend.c
@@ -0,0 +1,72 @@
+#include <linux/init.h>
+
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/memory.h>
+#include <asm/suspend.h>
+#include <asm/tlbflush.h>
+
+static pgd_t *suspend_pgd;
+
+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(suspend_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 (!suspend_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;
+}
+
+static int __init cpu_suspend_init(void)
+{
+        suspend_pgd = pgd_alloc(&init_mm);
+        if (suspend_pgd) {
+                unsigned long addr = virt_to_phys(cpu_resume_mmu);
+                identity_mapping_add(suspend_pgd, addr, addr + SECTION_SIZE);
+        }
+        return suspend_pgd ? 0 : -ENOMEM;
+}
+core_initcall(cpu_suspend_init);