/*
* Copyright (c) 2018, Renesas Electronics Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <asm_macros.S>
#include "rcar_def.h"
.global rcar_pwrc_switch_stack
.global rcar_pwrc_save_generic_timer
.global rcar_pwrc_restore_generic_timer
#define OFFSET_SP_X9_X10 (0x00)
#define OFFSET_CNTFID0 (0x10)
#define OFFSET_CNTPCT_EL0 (0x18)
#define OFFSET_TIMER_COUNT (0x20)
/*
* x0 : jump address,
* x1 : stack address,
* x2 : arg,
* x3 : stack address (temporary)
*/
func rcar_pwrc_switch_stack
/* lr to stack */
stp x29, x30, [sp,#-16]
/* change stack pointer */
mov x3, sp
mov sp, x1
/* save stack pointer */
sub sp, sp, #16
stp x0, x3, [sp]
/* data synchronization barrier */
dsb sy
/* jump to code */
mov x1, x0
mov x0, x2
blr x1
/* load stack pointer */
ldp x0, x2, [sp,#0]
/* change stack pointer */
mov sp, x2
/* return */
ldp x29, x30, [sp,#-16]
ret
endfunc rcar_pwrc_switch_stack
/* x0 : stack pointer base address */
func rcar_pwrc_save_generic_timer
stp x9, x10, [x0, #OFFSET_SP_X9_X10]
/* save CNTFID0 and cntpct_el0 */
mov_imm x10, (RCAR_CNTC_BASE + CNTFID_OFF)
ldr x9, [x10]
mrs x10, cntpct_el0
stp x9, x10, [x0, #OFFSET_CNTFID0]
ldp x9, x10, [x0, #OFFSET_SP_X9_X10]
ret
endfunc rcar_pwrc_save_generic_timer
/* x0 : Stack pointer base address */
func rcar_pwrc_restore_generic_timer
stp x9, x10, [x0, #OFFSET_SP_X9_X10]
/* restore CNTFID0 and cntpct_el0 */
ldr x10, [x0, #OFFSET_CNTFID0]
mov_imm x9, (RCAR_CNTC_BASE + CNTFID_OFF)
str x10, [x9]
ldp x9, x10, [x0, #OFFSET_CNTPCT_EL0]
add x9, x9, x10
str x9, [x0, #OFFSET_TIMER_COUNT]
ldp x9, x10, [x0, #OFFSET_SP_X9_X10]
ret
endfunc rcar_pwrc_restore_generic_timer
