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sh: SH-Mobile R-standby register save/restore

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Add code to save/restore registers during
R-standby sleep on SH-Mobile processors.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2010-02-25 11:03:24 +00:00 committed by Paul Mundt
parent da64c2a8de
commit 41bfb7d7a6
3 changed files with 122 additions and 3 deletions
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1
arch/sh/include/asm/suspend.h
View File

@ -92,5 +92,6 @@ extern unsigned long sh_mobile_sleep_supported;
#define SUSP_SH_USTANDBY (1 << 3) /* SH-Mobile U-standby mode */
#define SUSP_SH_SF (1 << 4) /* Enable self-refresh */
#define SUSP_SH_MMU (1 << 5) /* Save/restore MMU and cache */
#define SUSP_SH_REGS (1 << 6) /* Save/restore registers */
#endif /* _ASM_SH_SUSPEND_H */

3
arch/sh/kernel/cpu/shmobile/pm.c
View File

@ -33,7 +33,8 @@ ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list);
#define SUSP_MODE_SLEEP (SUSP_SH_SLEEP)
#define SUSP_MODE_SLEEP_SF (SUSP_SH_SLEEP | SUSP_SH_SF)
#define SUSP_MODE_STANDBY_SF (SUSP_SH_STANDBY | SUSP_SH_SF)
#define SUSP_MODE_RSTANDBY (SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_SF)
#define SUSP_MODE_RSTANDBY_SF \
(SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_REGS | SUSP_SH_SF)
/*
* U-standby mode is unsupported since it needs bootloader hacks
*/

121
arch/sh/kernel/cpu/shmobile/sleep.S
View File

@ -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)