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-rw-r--r--arch/sh/kernel/cpu/shmobile/sleep.S125
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/shmobile/sleep.S b/arch/sh/kernel/cpu/shmobile/sleep.S
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+++ b/arch/sh/kernel/cpu/shmobile/sleep.S
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+/*
+ * 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>
+
+/* 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)
+ mov r4, r0
+
+ tst #SUSP_SH_SF, r0
+ bt skip_set_sf
+
+ /* SDRAM: 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
+
+skip_set_sf:
+ tst #SUSP_SH_SLEEP, r0
+ bt test_standby
+
+ /* set mode to "sleep mode" */
+ bra do_sleep
+ mov #0x00, r1
+
+test_standby:
+ 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 done_sleep
+
+ /* set mode to "u-standby mode" */
+ mov #0x10, r1
+
+ /* fall-through */
+
+do_sleep:
+ /* setup and enter selected standby mode */
+ mov.l 5f, r4
+ mov.l r1, @r4
+ sleep
+
+done_sleep:
+ /* reset standby mode to sleep mode */
+ mov.l 5f, r4
+ mov #0x00, r1
+ mov.l r1, @r4
+
+ tst #SUSP_SH_SF, r0
+ bt skip_restore_sf
+
+ /* SDRAM: set auto-refresh mode */
+ mov.l 1f, r4
+ mov.l @r4, r2
+ mov.l 4f, r3
+ and r3, r2
+ mov.l r2, @r4
+ mov.l 6f, r4
+ mov.l 7f, r1
+ mov.l 8f, r2
+ mov.l @r4, r3
+ mov #-1, r4
+ add r4, r3
+ or r2, r3
+ mov.l r3, @r1
+skip_restore_sf:
+ rts
+ nop
+
+ .balign 4
+1: .long 0xfe400008 /* SDCR0 */
+2: .long 0x00000400
+3: .long 0xffff7fff
+4: .long 0xfffffbff
+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
+ /* sh7722 will end up here in sleep mode */
+ rte
+ nop
+sh_mobile_standby_end:
+
+ENTRY(sh_mobile_standby_size)
+ .long sh_mobile_standby_end - sh_mobile_standby