156 lines
3.8 KiB
C
156 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Copyright (C) 2014 Imagination Technologies Ltd
|
|
*
|
|
* PM helper macros for CPU power off (e.g. Suspend-to-RAM).
|
|
*/
|
|
|
|
#ifndef __ASM_PM_H
|
|
#define __ASM_PM_H
|
|
|
|
#ifdef __ASSEMBLY__
|
|
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/asm.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/regdef.h>
|
|
|
|
/* Save CPU state to stack for suspend to RAM */
|
|
.macro SUSPEND_SAVE_REGS
|
|
subu sp, PT_SIZE
|
|
/* Call preserved GPRs */
|
|
LONG_S $16, PT_R16(sp)
|
|
LONG_S $17, PT_R17(sp)
|
|
LONG_S $18, PT_R18(sp)
|
|
LONG_S $19, PT_R19(sp)
|
|
LONG_S $20, PT_R20(sp)
|
|
LONG_S $21, PT_R21(sp)
|
|
LONG_S $22, PT_R22(sp)
|
|
LONG_S $23, PT_R23(sp)
|
|
LONG_S $28, PT_R28(sp)
|
|
LONG_S $30, PT_R30(sp)
|
|
LONG_S $31, PT_R31(sp)
|
|
/* A couple of CP0 registers with space in pt_regs */
|
|
mfc0 k0, CP0_STATUS
|
|
LONG_S k0, PT_STATUS(sp)
|
|
.endm
|
|
|
|
/* Restore CPU state from stack after resume from RAM */
|
|
.macro RESUME_RESTORE_REGS_RETURN
|
|
.set push
|
|
.set noreorder
|
|
/* A couple of CP0 registers with space in pt_regs */
|
|
LONG_L k0, PT_STATUS(sp)
|
|
mtc0 k0, CP0_STATUS
|
|
/* Call preserved GPRs */
|
|
LONG_L $16, PT_R16(sp)
|
|
LONG_L $17, PT_R17(sp)
|
|
LONG_L $18, PT_R18(sp)
|
|
LONG_L $19, PT_R19(sp)
|
|
LONG_L $20, PT_R20(sp)
|
|
LONG_L $21, PT_R21(sp)
|
|
LONG_L $22, PT_R22(sp)
|
|
LONG_L $23, PT_R23(sp)
|
|
LONG_L $28, PT_R28(sp)
|
|
LONG_L $30, PT_R30(sp)
|
|
LONG_L $31, PT_R31(sp)
|
|
/* Pop and return */
|
|
jr ra
|
|
addiu sp, PT_SIZE
|
|
.set pop
|
|
.endm
|
|
|
|
/* Get address of static suspend state into t1 */
|
|
.macro LA_STATIC_SUSPEND
|
|
la t1, mips_static_suspend_state
|
|
.endm
|
|
|
|
/* Save important CPU state for early restoration to global data */
|
|
.macro SUSPEND_SAVE_STATIC
|
|
#ifdef CONFIG_EVA
|
|
/*
|
|
* Segment configuration is saved in global data where it can be easily
|
|
* reloaded without depending on the segment configuration.
|
|
*/
|
|
mfc0 k0, CP0_PAGEMASK, 2 /* SegCtl0 */
|
|
LONG_S k0, SSS_SEGCTL0(t1)
|
|
mfc0 k0, CP0_PAGEMASK, 3 /* SegCtl1 */
|
|
LONG_S k0, SSS_SEGCTL1(t1)
|
|
mfc0 k0, CP0_PAGEMASK, 4 /* SegCtl2 */
|
|
LONG_S k0, SSS_SEGCTL2(t1)
|
|
#endif
|
|
/* save stack pointer (pointing to GPRs) */
|
|
LONG_S sp, SSS_SP(t1)
|
|
.endm
|
|
|
|
/* Restore important CPU state early from global data */
|
|
.macro RESUME_RESTORE_STATIC
|
|
#ifdef CONFIG_EVA
|
|
/*
|
|
* Segment configuration must be restored prior to any access to
|
|
* allocated memory, as it may reside outside of the legacy kernel
|
|
* segments.
|
|
*/
|
|
LONG_L k0, SSS_SEGCTL0(t1)
|
|
mtc0 k0, CP0_PAGEMASK, 2 /* SegCtl0 */
|
|
LONG_L k0, SSS_SEGCTL1(t1)
|
|
mtc0 k0, CP0_PAGEMASK, 3 /* SegCtl1 */
|
|
LONG_L k0, SSS_SEGCTL2(t1)
|
|
mtc0 k0, CP0_PAGEMASK, 4 /* SegCtl2 */
|
|
tlbw_use_hazard
|
|
#endif
|
|
/* restore stack pointer (pointing to GPRs) */
|
|
LONG_L sp, SSS_SP(t1)
|
|
.endm
|
|
|
|
/* flush caches to make sure context has reached memory */
|
|
.macro SUSPEND_CACHE_FLUSH
|
|
.extern __wback_cache_all
|
|
.set push
|
|
.set noreorder
|
|
la t1, __wback_cache_all
|
|
LONG_L t0, 0(t1)
|
|
jalr t0
|
|
nop
|
|
.set pop
|
|
.endm
|
|
|
|
/* Save suspend state and flush data caches to RAM */
|
|
.macro SUSPEND_SAVE
|
|
SUSPEND_SAVE_REGS
|
|
LA_STATIC_SUSPEND
|
|
SUSPEND_SAVE_STATIC
|
|
SUSPEND_CACHE_FLUSH
|
|
.endm
|
|
|
|
/* Restore saved state after resume from RAM and return */
|
|
.macro RESUME_RESTORE_RETURN
|
|
LA_STATIC_SUSPEND
|
|
RESUME_RESTORE_STATIC
|
|
RESUME_RESTORE_REGS_RETURN
|
|
.endm
|
|
|
|
#else /* __ASSEMBLY__ */
|
|
|
|
/**
|
|
* struct mips_static_suspend_state - Core saved CPU state across S2R.
|
|
* @segctl: CP0 Segment control registers.
|
|
* @sp: Stack frame where GP register context is saved.
|
|
*
|
|
* This structure contains minimal CPU state that must be saved in static kernel
|
|
* data in order to be able to restore the rest of the state. This includes
|
|
* segmentation configuration in the case of EVA being enabled, as they must be
|
|
* restored prior to any kmalloc'd memory being referenced (even the stack
|
|
* pointer).
|
|
*/
|
|
struct mips_static_suspend_state {
|
|
#ifdef CONFIG_EVA
|
|
unsigned long segctl[3];
|
|
#endif
|
|
unsigned long sp;
|
|
};
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* __ASM_PM_HELPERS_H */
|