sh: Add R-standby sleep mode support
Add R-standby specific bits to the SuperH Mobile sleep code.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/include/asm/suspend.h b/arch/sh/include/asm/suspend.h
index 702025d..fe9c2a1 100644
--- a/arch/sh/include/asm/suspend.h
+++ b/arch/sh/include/asm/suspend.h
@@ -38,6 +38,7 @@
/* register structure for address/data information */
struct sh_sleep_regs {
unsigned long stbcr;
+ unsigned long bar;
/* MMU */
unsigned long pteh;
@@ -63,10 +64,14 @@
unsigned long sf_pre;
unsigned long sf_post;
+ /* address of resume code */
+ unsigned long resume;
+
/* register state saved and restored by the assembly code */
unsigned long vbr;
unsigned long spc;
unsigned long sr;
+ unsigned long sp;
/* structure for keeping register addresses */
struct sh_sleep_regs addr;
diff --git a/arch/sh/kernel/asm-offsets.c b/arch/sh/kernel/asm-offsets.c
index 6026b0f..08a2be7 100644
--- a/arch/sh/kernel/asm-offsets.c
+++ b/arch/sh/kernel/asm-offsets.c
@@ -38,12 +38,15 @@
DEFINE(SH_SLEEP_MODE, offsetof(struct sh_sleep_data, mode));
DEFINE(SH_SLEEP_SF_PRE, offsetof(struct sh_sleep_data, sf_pre));
DEFINE(SH_SLEEP_SF_POST, offsetof(struct sh_sleep_data, sf_post));
+ DEFINE(SH_SLEEP_RESUME, offsetof(struct sh_sleep_data, resume));
DEFINE(SH_SLEEP_VBR, offsetof(struct sh_sleep_data, vbr));
DEFINE(SH_SLEEP_SPC, offsetof(struct sh_sleep_data, spc));
DEFINE(SH_SLEEP_SR, offsetof(struct sh_sleep_data, sr));
+ DEFINE(SH_SLEEP_SP, offsetof(struct sh_sleep_data, sp));
DEFINE(SH_SLEEP_BASE_ADDR, offsetof(struct sh_sleep_data, addr));
DEFINE(SH_SLEEP_BASE_DATA, offsetof(struct sh_sleep_data, data));
DEFINE(SH_SLEEP_REG_STBCR, offsetof(struct sh_sleep_regs, stbcr));
+ DEFINE(SH_SLEEP_REG_BAR, offsetof(struct sh_sleep_regs, bar));
DEFINE(SH_SLEEP_REG_PTEH, offsetof(struct sh_sleep_regs, pteh));
DEFINE(SH_SLEEP_REG_PTEL, offsetof(struct sh_sleep_regs, ptel));
DEFINE(SH_SLEEP_REG_TTB, offsetof(struct sh_sleep_regs, ttb));
diff --git a/arch/sh/kernel/cpu/shmobile/pm.c b/arch/sh/kernel/cpu/shmobile/pm.c
index 4bd5e53..ca029a4 100644
--- a/arch/sh/kernel/cpu/shmobile/pm.c
+++ b/arch/sh/kernel/cpu/shmobile/pm.c
@@ -33,13 +33,10 @@
#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)
-
-/*
- * The following modes are not there yet:
- *
- * R-standby mode is unsupported, but will be added in the future
- * U-standby mode is low priority since it needs bootloader hacks
- */
+#define SUSP_MODE_RSTANDBY (SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_SF)
+ /*
+ * U-standby mode is unsupported since it needs bootloader hacks
+ */
#ifdef CONFIG_CPU_SUBTYPE_SH7724
#define RAM_BASE 0xfd800000 /* RSMEM */
@@ -90,6 +87,7 @@
/* part 0: data area */
sdp = onchip_mem;
sdp->addr.stbcr = 0xa4150020; /* STBCR */
+ sdp->addr.bar = 0xa4150040; /* BAR */
sdp->addr.pteh = 0xff000000; /* PTEH */
sdp->addr.ptel = 0xff000004; /* PTEL */
sdp->addr.ttb = 0xff000008; /* TTB */
@@ -124,6 +122,7 @@
vp = onchip_mem + 0x600; /* located at interrupt vector */
n = &sh_mobile_sleep_resume_end - &sh_mobile_sleep_resume_start;
memcpy(vp, &sh_mobile_sleep_resume_start, n);
+ sdp->resume = (unsigned long)vp;
sh_mobile_sleep_supported |= flags;
}
diff --git a/arch/sh/kernel/cpu/shmobile/sleep.S b/arch/sh/kernel/cpu/shmobile/sleep.S
index e620bf3..e9dd7fa 100644
--- a/arch/sh/kernel/cpu/shmobile/sleep.S
+++ b/arch/sh/kernel/cpu/shmobile/sleep.S
@@ -48,6 +48,9 @@
stc sr, r0
mov.l r0, @(SH_SLEEP_SR, r5)
+ /* save sp */
+ mov.l r15, @(SH_SLEEP_SP, r5)
+
/* save stbcr */
bsr save_register
mov #SH_SLEEP_REG_STBCR, r0
@@ -125,6 +128,12 @@
tst #SUSP_SH_RSTANDBY, r0
bt test_ustandby
+ /* setup BAR register */
+ bsr get_register
+ mov #SH_SLEEP_REG_BAR, r0
+ mov.l @(SH_SLEEP_RESUME, r5), r1
+ mov.l r1, @r0
+
/* set mode to "r-standby mode" */
bra do_sleep
mov #0x20, r1
@@ -203,6 +212,9 @@
mov.l @(SH_SLEEP_SR, r5), r0
ldc r0, ssr
+ /* restore sp */
+ mov.l @(SH_SLEEP_SP, r5), r15
+
/* restore sleep mode register */
bsr restore_register
mov #SH_SLEEP_REG_STBCR, r0