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