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Diffstat (limited to 'arch/sh/kernel/cpu/shmobile/sleep.S')
-rw-r--r--arch/sh/kernel/cpu/shmobile/sleep.S121
1 files changed, 119 insertions, 2 deletions
diff --git a/arch/sh/kernel/cpu/shmobile/sleep.S b/arch/sh/kernel/cpu/shmobile/sleep.S
index e9dd7fa0abd2..e6aac65f5750 100644
--- a/arch/sh/kernel/cpu/shmobile/sleep.S
+++ b/arch/sh/kernel/cpu/shmobile/sleep.S
@@ -48,8 +48,48 @@ ENTRY(sh_mobile_sleep_enter_start)
stc sr, r0
mov.l r0, @(SH_SLEEP_SR, r5)
- /* save sp */
+ /* save general purpose registers to stack if needed */
+ mov.l @(SH_SLEEP_MODE, r5), r0
+ tst #SUSP_SH_REGS, r0
+ bt skip_regs_save
+
+ sts.l pr, @-r15
+ mov.l r14, @-r15
+ mov.l r13, @-r15
+ mov.l r12, @-r15
+ mov.l r11, @-r15
+ mov.l r10, @-r15
+ mov.l r9, @-r15
+ mov.l r8, @-r15
+
+ /* make sure bank0 is selected, save low registers */
+ mov.l rb_bit, r9
+ not r9, r9
+ bsr set_sr
+ mov #0, r10
+
+ bsr save_low_regs
+ nop
+
+ /* switch to bank 1, save low registers */
+ mov.l rb_bit, r10
+ bsr set_sr
+ mov #-1, r9
+
+ bsr save_low_regs
+ nop
+
+ /* switch back to bank 0 */
+ mov.l rb_bit, r9
+ not r9, r9
+ bsr set_sr
+ mov #0, r10
+
+skip_regs_save:
+
+ /* save sp, also set to internal ram */
mov.l r15, @(SH_SLEEP_SP, r5)
+ mov r5, r15
/* save stbcr */
bsr save_register
@@ -60,7 +100,7 @@ ENTRY(sh_mobile_sleep_enter_start)
tst #SUSP_SH_MMU, r0
bt skip_mmu_save_disable
- /* save mmu state */
+ /* save mmu state */
bsr save_register
mov #SH_SLEEP_REG_PTEH, r0
@@ -177,6 +217,29 @@ get_register:
mov.l @(r0, r5), r0
rts
nop
+
+set_sr:
+ stc sr, r8
+ and r9, r8
+ or r10, r8
+ ldc r8, sr
+ rts
+ nop
+
+save_low_regs:
+ mov.l r7, @-r15
+ mov.l r6, @-r15
+ mov.l r5, @-r15
+ mov.l r4, @-r15
+ mov.l r3, @-r15
+ mov.l r2, @-r15
+ mov.l r1, @-r15
+ rts
+ mov.l r0, @-r15
+
+ .balign 4
+rb_bit: .long 0x20000000 ! RB=1
+
ENTRY(sh_mobile_sleep_enter_end)
.balign 4
@@ -270,6 +333,40 @@ skip_restore_sf:
icbi @r0
skip_restore_mmu:
+
+ /* restore general purpose registers if needed */
+ mov.l @(SH_SLEEP_MODE, r5), r0
+ tst #SUSP_SH_REGS, r0
+ bt skip_restore_regs
+
+ /* switch to bank 1, restore low registers */
+ mov.l _rb_bit, r10
+ bsr _set_sr
+ mov #-1, r9
+
+ bsr restore_low_regs
+ nop
+
+ /* switch to bank0, restore low registers */
+ mov.l _rb_bit, r9
+ not r9, r9
+ bsr _set_sr
+ mov #0, r10
+
+ bsr restore_low_regs
+ nop
+
+ /* restore the rest of the registers */
+ mov.l @r15+, r8
+ mov.l @r15+, r9
+ mov.l @r15+, r10
+ mov.l @r15+, r11
+ mov.l @r15+, r12
+ mov.l @r15+, r13
+ mov.l @r15+, r14
+ lds.l @r15+, pr
+
+skip_restore_regs:
rte
nop
@@ -283,6 +380,26 @@ restore_register:
rts
nop
+_set_sr:
+ stc sr, r8
+ and r9, r8
+ or r10, r8
+ ldc r8, sr
+ rts
+ nop
+
+restore_low_regs:
+ mov.l @r15+, r0
+ mov.l @r15+, r1
+ mov.l @r15+, r2
+ mov.l @r15+, r3
+ mov.l @r15+, r4
+ mov.l @r15+, r5
+ mov.l @r15+, r6
+ rts
+ mov.l @r15+, r7
+
.balign 4
+_rb_bit: .long 0x20000000 ! RB=1
1: .long ~0x7ff
ENTRY(sh_mobile_sleep_resume_end)
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