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>

3 files changed, 21 insertions, 7 deletions

diff --git a/arch/sh/kernel/asm-offsets.c b/arch/sh/kernel/asm-offsets.c
index 6026b0f849a1..08a2be775b6c 100644
--- a/arch/sh/kernel/asm-offsets.c
+++ b/arch/sh/kernel/asm-offsets.c
@@ -38,12 +38,15 @@ int main(void)
         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 4bd5e5302bfb..ca029a44743c 100644
--- a/arch/sh/kernel/cpu/shmobile/pm.c
+++ b/arch/sh/kernel/cpu/shmobile/pm.c
@@ -33,13 +33,10 @@ 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)
-
-/*
- * 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 @@ void sh_mobile_register_self_refresh(unsigned long flags,
         /* 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 @@ void sh_mobile_register_self_refresh(unsigned long flags,
         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 e620bf397af5..e9dd7fa0abd2 100644
--- a/arch/sh/kernel/cpu/shmobile/sleep.S
+++ b/arch/sh/kernel/cpu/shmobile/sleep.S
@@ -48,6 +48,9 @@ ENTRY(sh_mobile_sleep_enter_start)
         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 @@ test_rstandby:
         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 @@ ENTRY(sh_mobile_sleep_resume_start)
         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