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/*
 * Copyright (C) 2014 Imagination Technologies Ltd
 *
 * This program is free software; you can redistribute	it and/or modify it
 * under  the terms of	the GNU General	 Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 * 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 */

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dec Folder 0755
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fw Folder 0755
ip32 Folder 0755
lasat Folder 0755
mach-ar7 Folder 0755
mach-ath25 Folder 0755
mach-ath79 Folder 0755
mach-au1x00 Folder 0755
mach-bcm47xx Folder 0755
mach-bcm63xx Folder 0755
mach-bmips Folder 0755
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mach-sibyte Folder 0755
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xtalk Folder 0755
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abi.h File 853 B 0644
addrspace.h File 4.1 KB 0644
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asm-prototypes.h File 197 B 0644
asm.h File 8.47 KB 0644
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cpu-info.h File 5.84 KB 0644
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fixmap.h File 2.29 KB 0644
floppy.h File 1.57 KB 0644
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fpu_emulator.h File 5.74 KB 0644
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hardirq.h File 544 B 0644
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idle.h File 689 B 0644
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io.h File 18.44 KB 0644
irq.h File 2.26 KB 0644
irq_cpu.h File 708 B 0644
irq_gt641xx.h File 2.69 KB 0644
irq_regs.h File 744 B 0644
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mips-cm.h File 15.86 KB 0644
mips-cpc.h File 5.83 KB 0644
mips-cps.h File 6.55 KB 0644
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mips-r2-to-r6-emul.h File 2.05 KB 0644
mips_machine.h File 1.32 KB 0644
mips_mt.h File 707 B 0644
mipsmtregs.h File 10.9 KB 0644
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mipsregs.h File 88.1 KB 0644
mmu.h File 550 B 0644
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mmzone.h File 561 B 0644
module.h File 4.45 KB 0644
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pci.h File 4.08 KB 0644
perf_event.h File 482 B 0644
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pgtable-32.h File 7.31 KB 0644
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pgtable.h File 17.34 KB 0644
pm-cps.h File 1.68 KB 0644
pm.h File 3.99 KB 0644
pmon.h File 1.64 KB 0644
prefetch.h File 2.1 KB 0644
processor.h File 11.71 KB 0644
prom.h File 845 B 0644
ptrace.h File 5.55 KB 0644
r4k-timer.h File 604 B 0644
r4kcache.h File 26.34 KB 0644
reboot.h File 440 B 0644
reg.h File 26 B 0644
regdef.h File 2.63 KB 0644
rtlx.h File 2.1 KB 0644
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serial.h File 607 B 0644
setup.h File 884 B 0644
sgialib.h File 2.45 KB 0644
sgiarcs.h File 15.32 KB 0644
shmparam.h File 352 B 0644
sigcontext.h File 1.04 KB 0644
signal.h File 1.02 KB 0644
sim.h File 2.32 KB 0644
smp-cps.h File 1.18 KB 0644
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smp.h File 3.31 KB 0644
sni.h File 7.27 KB 0644
socket.h File 1.34 KB 0644
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