From: Wu Zhangjin <wuzhangjin@xxxxxxxxx> 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 <wuzhangjin@xxxxxxxxx> --- 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
