[Gnewsense-dev] [loongson-PATCH-v1 22/27] Hibernation Support in mips system

[wuzhangjin]

From: Wu Zhangjin <address@hidden>

This is directly pulled from the to-mips branch of
http://dev.lemote.com/code/linux_loongson, only a few coding style
tuning under the support of script/checkpatch.pl

Signed-off-by: Wu Zhangjin <address@hidden>
---
 arch/mips/Kconfig               |    3 +
 arch/mips/Makefile              |    3 +
 arch/mips/include/asm/suspend.h |    2 +
 arch/mips/kernel/asm-offsets.c  |   13 ++++++
 arch/mips/power/Makefile        |    1 +
 arch/mips/power/cpu.c           |   51 +++++++++++++++++++++++++
 arch/mips/power/hibernate.S     |   78 +++++++++++++++++++++++++++++++++++++++
 include/linux/suspend.h         |    3 +-
 8 files changed, 153 insertions(+), 1 deletions(-)
 create mode 100644 arch/mips/power/Makefile
 create mode 100644 arch/mips/power/cpu.c
 create mode 100644 arch/mips/power/hibernate.S

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 33fe257..dc1cb5f 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2130,6 +2130,9 @@ endmenu
 
 menu "Power management options"
 
+config ARCH_HIBERNATION_POSSIBLE
+       def_bool y
+
 config ARCH_SUSPEND_POSSIBLE
        def_bool y
        depends on !SMP
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index d73f084..8bde363 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -677,6 +677,9 @@ core-y                      += arch/mips/kernel/ 
arch/mips/mm/ arch/mips/math-emu/
 
 drivers-$(CONFIG_OPROFILE)     += arch/mips/oprofile/
 
+# suspend and hibernation support
+drivers-$(CONFIG_PM)   += arch/mips/power/
+
 ifdef CONFIG_LASAT
 rom.bin rom.sw: vmlinux
        $(Q)$(MAKE) $(build)=arch/mips/lasat/image $@
diff --git a/arch/mips/include/asm/suspend.h b/arch/mips/include/asm/suspend.h
index 2562f8f..1d44287 100644
--- a/arch/mips/include/asm/suspend.h
+++ b/arch/mips/include/asm/suspend.h
@@ -3,4 +3,6 @@
 
 /* Somewhen...  Maybe :-)  */
 
+static inline int arch_prepare_suspend(void) { return 0; }
+
 #endif /* __ASM_SUSPEND_H */
diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index c901c22..26f5ef3 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -14,6 +14,7 @@
 #include <linux/mm.h>
 #include <linux/interrupt.h>
 #include <linux/kbuild.h>
+#include <linux/suspend.h>
 #include <asm/ptrace.h>
 #include <asm/processor.h>
 
@@ -326,3 +327,15 @@ void output_octeon_cop2_state_defines(void)
        BLANK();
 }
 #endif
+
+#ifdef CONFIG_HIBERNATION
+void output_pbe_defines(void)
+{
+       COMMENT(" Linux struct pbe offsets. ");
+       OFFSET(PBE_ADDRESS , pbe, address);
+       OFFSET(PBE_ORIG_ADDRESS  , pbe, orig_address);
+       OFFSET(PBE_NEXT  , pbe, next);
+       DEFINE(PBE_SIZE  , sizeof(struct pbe));
+       BLANK();
+}
+#endif
diff --git a/arch/mips/power/Makefile b/arch/mips/power/Makefile
new file mode 100644
index 0000000..73d56b8
--- /dev/null
+++ b/arch/mips/power/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_HIBERNATION) += cpu.o hibernate.o
diff --git a/arch/mips/power/cpu.c b/arch/mips/power/cpu.c
new file mode 100644
index 0000000..225345e
--- /dev/null
+++ b/arch/mips/power/cpu.c
@@ -0,0 +1,51 @@
+/*
+ * Suspend support specific for mips.
+ *
+ */
+#include <linux/mm.h>
+#include <asm/mipsregs.h>
+#include <asm/page.h>
+#include <linux/suspend.h>
+
+/* References to section boundaries */
+extern const void __nosave_begin, __nosave_end;
+
+static uint32_t saved_status;
+unsigned long
+       saved_ra,
+       saved_sp,
+       saved_fp,
+       saved_gp,
+       saved_s0,
+       saved_s1,
+       saved_s2,
+       saved_s3,
+       saved_s4,
+       saved_s5,
+       saved_s6,
+       saved_s7,
+       saved_a0,
+       saved_a1,
+       saved_a2,
+       saved_a3,
+       saved_v0,
+       saved_v1;
+
+void save_processor_state(void)
+{
+       saved_status = read_c0_status();
+}
+
+void restore_processor_state(void)
+{
+       write_c0_status(saved_status);
+}
+
+int pfn_is_nosave(unsigned long pfn)
+{
+       unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
+       unsigned long nosave_end_pfn = \
+               PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
+
+       return  (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
+}
diff --git a/arch/mips/power/hibernate.S b/arch/mips/power/hibernate.S
new file mode 100644
index 0000000..2f28074
--- /dev/null
+++ b/arch/mips/power/hibernate.S
@@ -0,0 +1,78 @@
+#incldue <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/regdef.h>
+#include <asm/asm.h>
+
+.text
+LEAF(swsusp_arch_suspend)
+       PTR_LA t0, saved_ra
+       PTR_S ra, (t0)
+       PTR_LA t0, saved_sp
+       PTR_S sp, (t0)
+       PTR_LA t0, saved_fp
+       PTR_S fp, (t0)
+       PTR_LA t0, saved_gp
+       PTR_S gp, (t0)
+       PTR_LA t0, saved_s0
+       PTR_S s0, (t0)
+       PTR_LA t0, saved_s1
+       PTR_S s1, (t0)
+       PTR_LA t0, saved_s2
+       PTR_S s2, (t0)
+       PTR_LA t0, saved_s3
+       PTR_S s3, (t0)
+       PTR_LA t0, saved_s4
+       PTR_S s4, (t0)
+       PTR_LA t0, saved_s5
+       PTR_S s5, (t0)
+       PTR_LA t0, saved_s6
+       PTR_S s6, (t0)
+       PTR_LA t0, saved_s7
+       PTR_S s7, (t0)
+       PTR_LA t0, saved_a0
+       PTR_S a0, (t0)
+       PTR_LA t0, saved_a1
+       PTR_S a1, (t0)
+       PTR_LA t0, saved_a2
+       PTR_S a2, (t0)
+       PTR_LA t0, saved_v1
+       PTR_S v1, (t0)
+       j swsusp_save
+       nop
+END(swsusp_arch_suspend)
+
+LEAF(swsusp_arch_resume)
+       PTR_L t0, restore_pblist
+0:
+       PTR_L t1, PBE_ADDRESS(t0)   /* source */
+       PTR_L t2, PBE_ORIG_ADDRESS(t0) /* destination */
+       PTR_ADDIU t3, t1, _PAGE_SIZE
+1:
+       REG_L t8, (t1)
+       REG_S t8, (t2)
+       PTR_ADDIU t1, t1, SZREG
+       PTR_ADDIU t2, t2, SZREG
+       bne t1, t3, 1b
+       PTR_L t0, PBE_NEXT(t0)
+       bnez t0, 0b
+       /* flush cache and tlb. no need?I am not sure. */
+       PTR_L ra, saved_ra
+       PTR_L sp, saved_sp
+       PTR_L fp, saved_fp
+       PTR_L s0, saved_s0
+       PTR_L s1, saved_s1
+       PTR_L s2, saved_s2
+       PTR_L s3, saved_s3
+       PTR_L s4, saved_s4
+       PTR_L s5, saved_s5
+       PTR_L s6, saved_s6
+       PTR_L s7, saved_s7
+       PTR_L a0, saved_a0
+       PTR_L a1, saved_a1
+       PTR_L a2, saved_a2
+       PTR_L a3, saved_a3
+       PTR_LI v0, 0x0
+       PTR_L v1, saved_v1
+       jr ra
+       nop
+END(swsusp_arch_resume)
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index c7d9bb1..c45a756 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -1,7 +1,8 @@
 #ifndef _LINUX_SUSPEND_H
 #define _LINUX_SUSPEND_H
 
-#if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || 
defined(CONFIG_PPC64)
+#if defined(CONFIG_X86) || defined(CONFIG_FRV) || defined(CONFIG_PPC32) || \
+       defined(CONFIG_PPC64) || defined(CONFIG_MIPS)
 #include <asm/suspend.h>
 #endif
 #include <linux/swap.h>
-- 
1.6.2.1