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/*
* Copyright (C) 2016 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <asm/asm.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/bmips.h>
#include "pm.h"
.text
.set noreorder
.align 5
.global s3_reentry
/*
* a0: AON_CTRL base register
* a1: D-Cache line size
*/
LEAF(brcm_pm_do_s3)
/* Get the address of s3_context */
la t0, gp_regs
sw ra, 0(t0)
sw s0, 4(t0)
sw s1, 8(t0)
sw s2, 12(t0)
sw s3, 16(t0)
sw s4, 20(t0)
sw s5, 24(t0)
sw s6, 28(t0)
sw s7, 32(t0)
sw gp, 36(t0)
sw sp, 40(t0)
sw fp, 44(t0)
/* Save CP0 Status */
mfc0 t1, CP0_STATUS
sw t1, 48(t0)
/* Write-back gp registers - cache will be gone */
addiu t1, a1, -1
not t1
and t0, t1
/* Flush at least 64 bytes */
addiu t2, t0, 64
and t2, t1
1: cache 0x17, 0(t0)
bne t0, t2, 1b
addu t0, a1
/* Drop to deep standby */
li t1, PM_WARM_CONFIG
sw zero, AON_CTRL_PM_CTRL(a0)
lw zero, AON_CTRL_PM_CTRL(a0)
sw t1, AON_CTRL_PM_CTRL(a0)
lw t1, AON_CTRL_PM_CTRL(a0)
li t1, (PM_WARM_CONFIG | PM_PWR_DOWN)
sw t1, AON_CTRL_PM_CTRL(a0)
lw t1, AON_CTRL_PM_CTRL(a0)
/* Enable CP0 interrupt 2 and wait for interrupt */
mfc0 t0, CP0_STATUS
li t1, ~(ST0_IM | ST0_IE)
and t0, t1
ori t0, STATUSF_IP2
mtc0 t0, CP0_STATUS
nop
nop
nop
ori t0, ST0_IE
mtc0 t0, CP0_STATUS
/* Wait for interrupt */
wait
nop
s3_reentry:
/* Clear call/return stack */
li t0, (0x06 << 16)
mtc0 t0, $22, 2
ssnop
ssnop
ssnop
/* Clear jump target buffer */
li t0, (0x04 << 16)
mtc0 t0, $22, 2
ssnop
ssnop
ssnop
sync
nop
/* Setup mmu defaults */
mtc0 zero, CP0_WIRED
mtc0 zero, CP0_ENTRYHI
li k0, PM_DEFAULT_MASK
mtc0 k0, CP0_PAGEMASK
li sp, BMIPS_WARM_RESTART_VEC
la k0, plat_wired_tlb_setup
jalr k0
nop
/* Restore general purpose registers */
la t0, gp_regs
lw fp, 44(t0)
lw sp, 40(t0)
lw gp, 36(t0)
lw s7, 32(t0)
lw s6, 28(t0)
lw s5, 24(t0)
lw s4, 20(t0)
lw s3, 16(t0)
lw s2, 12(t0)
lw s1, 8(t0)
lw s0, 4(t0)
lw ra, 0(t0)
/* Restore CP0 status */
lw t1, 48(t0)
mtc0 t1, CP0_STATUS
/* Return to caller */
li v0, 0
jr ra
nop
END(brcm_pm_do_s3)
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