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-rw-r--r--arch/nds32/kernel/sleep.S129
1 files changed, 129 insertions, 0 deletions
diff --git a/arch/nds32/kernel/sleep.S b/arch/nds32/kernel/sleep.S
new file mode 100644
index 000000000000..60c64bfbc901
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+++ b/arch/nds32/kernel/sleep.S
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+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2017 Andes Technology Corporation */
+
+#include <asm/memory.h>
+
+.data
+.global sp_tmp
+sp_tmp:
+.long
+
+.text
+.globl suspend2ram
+.globl cpu_resume
+
+suspend2ram:
+ pushm $r0, $r31
+#if defined(CONFIG_HWZOL)
+ mfusr $r0, $lc
+ mfusr $r1, $le
+ mfusr $r2, $lb
+#endif
+ mfsr $r3, $mr0
+ mfsr $r4, $mr1
+ mfsr $r5, $mr4
+ mfsr $r6, $mr6
+ mfsr $r7, $mr7
+ mfsr $r8, $mr8
+ mfsr $r9, $ir0
+ mfsr $r10, $ir1
+ mfsr $r11, $ir2
+ mfsr $r12, $ir3
+ mfsr $r13, $ir9
+ mfsr $r14, $ir10
+ mfsr $r15, $ir12
+ mfsr $r16, $ir13
+ mfsr $r17, $ir14
+ mfsr $r18, $ir15
+ pushm $r0, $r19
+
+ tlbop FlushAll
+ isb
+
+ // transfer $sp from va to pa
+ sethi $r0, hi20(PAGE_OFFSET)
+ ori $r0, $r0, lo12(PAGE_OFFSET)
+ movi $r2, PHYS_OFFSET
+ sub $r1, $sp, $r0
+ add $r2, $r1, $r2
+
+ // store pa($sp) to sp_tmp
+ sethi $r1, hi20(sp_tmp)
+ swi $r2, [$r1 + lo12(sp_tmp)]
+
+ pushm $r16, $r25
+ pushm $r29, $r30
+#ifdef CONFIG_CACHE_L2
+ jal dcache_wb_all_level
+#else
+ jal cpu_dcache_wb_all
+#endif
+ popm $r29, $r30
+ popm $r16, $r25
+
+ // get wake_mask and loop in standby
+ la $r1, wake_mask
+ lwi $r1, [$r1]
+self_loop:
+ standby wake_grant
+ mfsr $r2, $ir15
+ and $r2, $r1, $r2
+ beqz $r2, self_loop
+
+ // set ipc to resume address
+ la $r1, resume_addr
+ lwi $r1, [$r1]
+ mtsr $r1, $ipc
+ isb
+
+ // reset psw, turn off the address translation
+ li $r2, 0x7000a
+ mtsr $r2, $ipsw
+ isb
+
+ iret
+cpu_resume:
+ // translate the address of sp_tmp variable to pa
+ la $r1, sp_tmp
+ sethi $r0, hi20(PAGE_OFFSET)
+ ori $r0, $r0, lo12(PAGE_OFFSET)
+ movi $r2, PHYS_OFFSET
+ sub $r1, $r1, $r0
+ add $r1, $r1, $r2
+
+ // access the sp_tmp to get stack pointer
+ lwi $sp, [$r1]
+
+ popm $r0, $r19
+#if defined(CONFIG_HWZOL)
+ mtusr $r0, $lb
+ mtusr $r1, $lc
+ mtusr $r2, $le
+#endif
+ mtsr $r3, $mr0
+ mtsr $r4, $mr1
+ mtsr $r5, $mr4
+ mtsr $r6, $mr6
+ mtsr $r7, $mr7
+ mtsr $r8, $mr8
+ // set original psw to ipsw
+ mtsr $r9, $ir1
+
+ mtsr $r11, $ir2
+ mtsr $r12, $ir3
+
+ // set ipc to RR
+ la $r13, RR
+ mtsr $r13, $ir9
+
+ mtsr $r14, $ir10
+ mtsr $r15, $ir12
+ mtsr $r16, $ir13
+ mtsr $r17, $ir14
+ mtsr $r18, $ir15
+ popm $r0, $r31
+
+ isb
+ iret
+RR:
+ ret