126 lines
3.7 KiB
ArmAsm
126 lines
3.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (c) 2021 Western Digital Corporation or its affiliates.
|
|
* Copyright (c) 2022 Ventana Micro Systems Inc.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/asm.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/csr.h>
|
|
#include <asm/xip_fixup.h>
|
|
|
|
.text
|
|
.altmacro
|
|
.option norelax
|
|
|
|
ENTRY(__cpu_suspend_enter)
|
|
/* Save registers (except A0 and T0-T6) */
|
|
REG_S ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
|
|
REG_S sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
|
|
REG_S gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
|
|
REG_S tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
|
|
REG_S s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
|
|
REG_S s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
|
|
REG_S a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
|
|
REG_S a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
|
|
REG_S a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
|
|
REG_S a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
|
|
REG_S a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
|
|
REG_S a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
|
|
REG_S a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
|
|
REG_S s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
|
|
REG_S s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
|
|
REG_S s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
|
|
REG_S s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
|
|
REG_S s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
|
|
REG_S s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
|
|
REG_S s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
|
|
REG_S s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
|
|
REG_S s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
|
|
REG_S s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
|
|
|
|
/* Save CSRs */
|
|
csrr t0, CSR_EPC
|
|
REG_S t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
|
|
csrr t0, CSR_STATUS
|
|
REG_S t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
|
|
csrr t0, CSR_TVAL
|
|
REG_S t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
|
|
csrr t0, CSR_CAUSE
|
|
REG_S t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
|
|
|
|
/* Return non-zero value */
|
|
li a0, 1
|
|
|
|
/* Return to C code */
|
|
ret
|
|
END(__cpu_suspend_enter)
|
|
|
|
ENTRY(__cpu_resume_enter)
|
|
/* Load the global pointer */
|
|
.option push
|
|
.option norelax
|
|
la gp, __global_pointer$
|
|
.option pop
|
|
|
|
#ifdef CONFIG_MMU
|
|
/* Save A0 and A1 */
|
|
add t0, a0, zero
|
|
add t1, a1, zero
|
|
|
|
/* Enable MMU */
|
|
la a0, swapper_pg_dir
|
|
XIP_FIXUP_OFFSET a0
|
|
call relocate_enable_mmu
|
|
|
|
/* Restore A0 and A1 */
|
|
add a0, t0, zero
|
|
add a1, t1, zero
|
|
#endif
|
|
|
|
/* Make A0 point to suspend context */
|
|
add a0, a1, zero
|
|
|
|
/* Restore CSRs */
|
|
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
|
|
csrw CSR_EPC, t0
|
|
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
|
|
csrw CSR_STATUS, t0
|
|
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
|
|
csrw CSR_TVAL, t0
|
|
REG_L t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
|
|
csrw CSR_CAUSE, t0
|
|
|
|
/* Restore registers (except A0 and T0-T6) */
|
|
REG_L ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
|
|
REG_L sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
|
|
REG_L gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
|
|
REG_L tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
|
|
REG_L s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
|
|
REG_L s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
|
|
REG_L a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
|
|
REG_L a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
|
|
REG_L a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
|
|
REG_L a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
|
|
REG_L a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
|
|
REG_L a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
|
|
REG_L a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
|
|
REG_L s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
|
|
REG_L s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
|
|
REG_L s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
|
|
REG_L s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
|
|
REG_L s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
|
|
REG_L s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
|
|
REG_L s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
|
|
REG_L s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
|
|
REG_L s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
|
|
REG_L s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
|
|
|
|
/* Return zero value */
|
|
add a0, zero, zero
|
|
|
|
/* Return to C code */
|
|
ret
|
|
END(__cpu_resume_enter)
|