160 lines
4.0 KiB
C
160 lines
4.0 KiB
C
/*
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* Copyright (C) 2014 Imagination Technologies Ltd
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* PM helper macros for CPU power off (e.g. Suspend-to-RAM).
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*/
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#ifndef __ASM_PM_H
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#define __ASM_PM_H
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#ifdef __ASSEMBLY__
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#include <asm/asm-offsets.h>
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#include <asm/asm.h>
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#include <asm/mipsregs.h>
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#include <asm/regdef.h>
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/* Save CPU state to stack for suspend to RAM */
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.macro SUSPEND_SAVE_REGS
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subu sp, PT_SIZE
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/* Call preserved GPRs */
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LONG_S $16, PT_R16(sp)
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LONG_S $17, PT_R17(sp)
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LONG_S $18, PT_R18(sp)
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LONG_S $19, PT_R19(sp)
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LONG_S $20, PT_R20(sp)
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LONG_S $21, PT_R21(sp)
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LONG_S $22, PT_R22(sp)
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LONG_S $23, PT_R23(sp)
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LONG_S $28, PT_R28(sp)
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LONG_S $30, PT_R30(sp)
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LONG_S $31, PT_R31(sp)
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/* A couple of CP0 registers with space in pt_regs */
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mfc0 k0, CP0_STATUS
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LONG_S k0, PT_STATUS(sp)
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.endm
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/* Restore CPU state from stack after resume from RAM */
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.macro RESUME_RESTORE_REGS_RETURN
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.set push
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.set noreorder
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/* A couple of CP0 registers with space in pt_regs */
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LONG_L k0, PT_STATUS(sp)
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mtc0 k0, CP0_STATUS
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/* Call preserved GPRs */
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LONG_L $16, PT_R16(sp)
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LONG_L $17, PT_R17(sp)
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LONG_L $18, PT_R18(sp)
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LONG_L $19, PT_R19(sp)
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LONG_L $20, PT_R20(sp)
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LONG_L $21, PT_R21(sp)
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LONG_L $22, PT_R22(sp)
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LONG_L $23, PT_R23(sp)
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LONG_L $28, PT_R28(sp)
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LONG_L $30, PT_R30(sp)
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LONG_L $31, PT_R31(sp)
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/* Pop and return */
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jr ra
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addiu sp, PT_SIZE
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.set pop
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.endm
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/* Get address of static suspend state into t1 */
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.macro LA_STATIC_SUSPEND
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la t1, mips_static_suspend_state
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.endm
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/* Save important CPU state for early restoration to global data */
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.macro SUSPEND_SAVE_STATIC
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#ifdef CONFIG_EVA
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/*
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* Segment configuration is saved in global data where it can be easily
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* reloaded without depending on the segment configuration.
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*/
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mfc0 k0, CP0_PAGEMASK, 2 /* SegCtl0 */
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LONG_S k0, SSS_SEGCTL0(t1)
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mfc0 k0, CP0_PAGEMASK, 3 /* SegCtl1 */
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LONG_S k0, SSS_SEGCTL1(t1)
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mfc0 k0, CP0_PAGEMASK, 4 /* SegCtl2 */
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LONG_S k0, SSS_SEGCTL2(t1)
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#endif
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/* save stack pointer (pointing to GPRs) */
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LONG_S sp, SSS_SP(t1)
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.endm
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/* Restore important CPU state early from global data */
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.macro RESUME_RESTORE_STATIC
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#ifdef CONFIG_EVA
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/*
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* Segment configuration must be restored prior to any access to
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* allocated memory, as it may reside outside of the legacy kernel
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* segments.
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*/
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LONG_L k0, SSS_SEGCTL0(t1)
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mtc0 k0, CP0_PAGEMASK, 2 /* SegCtl0 */
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LONG_L k0, SSS_SEGCTL1(t1)
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mtc0 k0, CP0_PAGEMASK, 3 /* SegCtl1 */
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LONG_L k0, SSS_SEGCTL2(t1)
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mtc0 k0, CP0_PAGEMASK, 4 /* SegCtl2 */
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tlbw_use_hazard
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#endif
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/* restore stack pointer (pointing to GPRs) */
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LONG_L sp, SSS_SP(t1)
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.endm
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/* flush caches to make sure context has reached memory */
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.macro SUSPEND_CACHE_FLUSH
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.extern __wback_cache_all
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.set push
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.set noreorder
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la t1, __wback_cache_all
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LONG_L t0, 0(t1)
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jalr t0
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nop
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.set pop
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.endm
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/* Save suspend state and flush data caches to RAM */
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.macro SUSPEND_SAVE
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SUSPEND_SAVE_REGS
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LA_STATIC_SUSPEND
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SUSPEND_SAVE_STATIC
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SUSPEND_CACHE_FLUSH
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.endm
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/* Restore saved state after resume from RAM and return */
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.macro RESUME_RESTORE_RETURN
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LA_STATIC_SUSPEND
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RESUME_RESTORE_STATIC
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RESUME_RESTORE_REGS_RETURN
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.endm
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#else /* __ASSEMBLY__ */
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/**
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* struct mips_static_suspend_state - Core saved CPU state across S2R.
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* @segctl: CP0 Segment control registers.
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* @sp: Stack frame where GP register context is saved.
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*
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* This structure contains minimal CPU state that must be saved in static kernel
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* data in order to be able to restore the rest of the state. This includes
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* segmentation configuration in the case of EVA being enabled, as they must be
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* restored prior to any kmalloc'd memory being referenced (even the stack
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* pointer).
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*/
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struct mips_static_suspend_state {
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#ifdef CONFIG_EVA
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unsigned long segctl[3];
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#endif
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unsigned long sp;
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};
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_PM_HELPERS_H */
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