/*
* arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S
*
* Sleep mode and Standby modes support for SuperH Mobile
*
* Copyright (C) 2009 Magnus Damm
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/sys.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/suspend.h>
/*
* Kernel mode register usage, see entry.S:
* k0 scratch
* k1 scratch
* k4 scratch
*/
#define k0 r0
#define k1 r1
#define k4 r4
/* manage self-refresh and enter standby mode.
* this code will be copied to on-chip memory and executed from there.
*/
.balign 4096,0,4096
ENTRY(sh_mobile_standby)
/* save original vbr */
stc vbr, r1
mova saved_vbr, r0
mov.l r1, @r0
/* point vbr to our on-chip memory page */
ldc r5, vbr
/* save return address */
mova saved_spc, r0
sts pr, r5
mov.l r5, @r0
/* save sr */
mova saved_sr, r0
stc sr, r5
mov.l r5, @r0
/* save mode flags */
mova saved_mode, r0
mov.l r4, @r0
/* put mode flags in r0 */
mov r4, r0
tst #SUSP_SH_SF, r0
bt skip_set_sf
#ifdef CONFIG_CPU_SUBTYPE_SH7724
/* DBSC: put memory in self-refresh mode */
mov.l dben_reg, r4
mov.l dben_data0, r1
mov.l r1, @r4
mov.l dbrfpdn0_reg, r4
mov.l dbrfpdn0_data0, r1
mov.l r1, @r4
mov.l dbcmdcnt_reg, r4
mov.l dbcmdcnt_data0, r1
mov.l r1, @r4
mov.l dbcmdcnt_reg, r4
mov.l dbcmdcnt_data1, r1
mov.l r1, @r4
mov.l dbrfpdn0_reg, r4
mov.l dbrfpdn0_data1, r1
mov.l r1, @r4
#else
/* SBSC: disable power down and put in self-refresh mode */
mov.l 1f, r4
mov.l 2f, r1
mov.l @r4, r2
or r1, r2
mov.l 3f, r3
and r3, r2
mov.l r2, @r4
#endif
skip_set_sf:
tst #SUSP_SH_STANDBY, r0
bt test_rstandby
/* set mode to "software standby mode" */
bra do_sleep
mov #0x80, r1
test_rstandby:
tst #SUSP_SH_RSTANDBY, r0
bt test_ustandby
/* set mode to "r-standby mode" */
bra do_sleep
mov #0x20, r1
test_ustandby:
tst #SUSP_SH_USTANDBY, r0
bt force_sleep
/* set mode to "u-standby mode" */
bra do_sleep
mov #0x10, r1
force_sleep:
/* set mode to "sleep mode" */
mov #0x00, r1
do_sleep:
/* setup and enter selected standby mode */
mov.l 5f, r4
mov.l r1, @r4
again:
sleep
bra again
nop
restore_jump_vbr:
/* setup spc with return address to c code */
mov.l saved_spc, k0
ldc k0, spc
/* restore vbr */
mov.l saved_vbr, k0
ldc k0, vbr
/* setup ssr with saved sr */
mov.l saved_sr, k0
ldc k0, ssr
/* get mode flags */
mov.l saved_mode, k0
done_sleep:
/* reset standby mode to sleep mode */
mov.l 5f, k4
mov #0x00, k1
mov.l k1, @k4
tst #SUSP_SH_SF, k0
bt skip_restore_sf
#ifdef CONFIG_CPU_SUBTYPE_SH7724
/* DBSC: put memory in auto-refresh mode */
mov.l dbrfpdn0_reg, k4
mov.l dbrfpdn0_data0, k1
mov.l k1, @k4
nop /* sleep 140 ns */
nop
nop
nop
mov.l dbcmdcnt_reg, k4
mov.l dbcmdcnt_data0, k1
mov.l k1, @k4
mov.l dbcmdcnt_reg, k4
mov.l dbcmdcnt_data1, k1
mov.l k1, @k4
mov.l dben_reg, k4
mov.l dben_data1, k1
mov.l k1, @k4
mov.l dbrfpdn0_reg, k4
mov.l dbrfpdn0_data2, k1
mov.l k1, @k4
#else
/* SBSC: set auto-refresh mode */
mov.l 1f, k4
mov.l @k4, k0
mov.l 4f, k1
and k1, k0
mov.l k0, @k4
mov.l 6f, k4
mov.l 8f, k0
mov.l @k4, k1
mov #-1, k4
add k4, k1
or k1, k0
mov.l 7f, k1
mov.l k0, @k1
#endif
skip_restore_sf:
/* jump to vbr vector */
mov.l saved_vbr, k0
mov.l offset_vbr, k4
add k4, k0
jmp @k0
nop
.balign 4
saved_mode: .long 0
saved_spc: .long 0
saved_sr: .long 0
saved_vbr: .long 0
offset_vbr: .long 0x600
#ifdef CONFIG_CPU_SUBTYPE_SH7724
dben_reg: .long 0xfd000010 /* DBEN */
dben_data0: .long 0
dben_data1: .long 1
dbrfpdn0_reg: .long 0xfd000040 /* DBRFPDN0 */
dbrfpdn0_data0: .long 0
dbrfpdn0_data1: .long 1
dbrfpdn0_data2: .long 0x00010000
dbcmdcnt_reg: .long 0xfd000014 /* DBCMDCNT */
dbcmdcnt_data0: .long 2
dbcmdcnt_data1: .long 4
#else
1: .long 0xfe400008 /* SDCR0 */
2: .long 0x00000400
3: .long 0xffff7fff
4: .long 0xfffffbff
#endif
5: .long 0xa4150020 /* STBCR */
6: .long 0xfe40001c /* RTCOR */
7: .long 0xfe400018 /* RTCNT */
8: .long 0xa55a0000
/* interrupt vector @ 0x600 */
.balign 0x400,0,0x400
.long 0xdeadbeef
.balign 0x200,0,0x200
bra restore_jump_vbr
nop
sh_mobile_standby_end:
ENTRY(sh_mobile_standby_size)
.long sh_mobile_standby_end - sh_mobile_standby
