sh: Add KFR2R09 specific memory pre/post R-standby code

Add R-standby support to the KFR2R09 sdram code.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/arch/sh/boards/mach-kfr2r09/sdram.S b/arch/sh/boards/mach-kfr2r09/sdram.S
index 4ce78fcf5674..0c9f55bec2fe 100644
--- a/arch/sh/boards/mach-kfr2r09/sdram.S
+++ b/arch/sh/boards/mach-kfr2r09/sdram.S
@@ -39,6 +39,10 @@ ENTRY(kfr2r09_sdram_leave_start)
 
         /* DBSC: put memory in auto-refresh mode */
 
+        mov.l   @(SH_SLEEP_MODE, r5), r0
+        tst     #SUSP_SH_RSTANDBY, r0
+        bf      resume_rstandby
+
         ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
         WAIT 1
         ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
@@ -49,4 +53,28 @@ ENTRY(kfr2r09_sdram_leave_start)
         rts
          nop
 
+resume_rstandby:
+
+        /* DBSC: re-initialize and put in auto-refresh */
+
+        ED 0xFD000108, 0x40000301 /* DBPDCNT0 */
+        ED 0xFD000020, 0x011B0002 /* DBCONF */
+        ED 0xFD000030, 0x03060E02 /* DBTR0 */
+        ED 0xFD000034, 0x01020102 /* DBTR1 */
+        ED 0xFD000038, 0x01090406 /* DBTR2 */
+        ED 0xFD000008, 0x00000004 /* DBKIND */
+        ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
+        ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
+        ED 0xFD000018, 0x00000001 /* DBCKECNT */
+        WAIT 1
+        ED 0xFD000010, 0x00000001 /* DBEN */
+        ED 0xFD000044, 0x000004AF /* DBRFPDN1 */
+        ED 0xFD000048, 0x20CF0037 /* DBRFPDN2 */
+        ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
+        ED 0xFD000108, 0x40000300 /* DBPDCNT0 */
+        ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
+
+        rts
+         nop
+
 ENTRY(kfr2r09_sdram_leave_end)