sh: ms7724se r-standby support

This patch adds board specific r-standby resume code
for ms7724se.

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

2 files changed, 81 insertions, 1 deletions

diff --git a/arch/sh/boards/mach-se/7724/sdram.S b/arch/sh/boards/mach-se/7724/sdram.S
index 9040167d5022..6fa4734d09c7 100644
--- a/arch/sh/boards/mach-se/7724/sdram.S
+++ b/arch/sh/boards/mach-se/7724/sdram.S
@@ -39,6 +39,10 @@ ENTRY(ms7724se_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 +53,79 @@ ENTRY(ms7724se_sdram_leave_start)
         rts
          nop
 
+resume_rstandby:
+
+        /* CPG: setup clocks before restarting external memory */
+
+        ED 0xA4150024, 0x00004000 /* PLLCR */
+
+        mov.l   FRQCRA,r0
+        mov.l   @r0,r3
+        mov.l   KICK,r1
+        or      r1, r3
+        mov.l   r3, @r0
+
+        mov.l   LSTATS,r0
+        mov     #1,r1
+WAIT_LSTATS:
+        mov.l   @r0,r3
+        tst     r1,r3
+        bf      WAIT_LSTATS
+
+        /* DBSC: re-initialize and put in auto-refresh */
+
+        ED 0xFD000108, 0x00000181 /* DBPDCNT0 */
+        ED 0xFD000020, 0x015B0002 /* DBCONF */
+        ED 0xFD000030, 0x03071502 /* DBTR0 */
+        ED 0xFD000034, 0x02020102 /* DBTR1 */
+        ED 0xFD000038, 0x01090405 /* DBTR2 */
+        ED 0xFD00003C, 0x00000002 /* DBTR3 */
+        ED 0xFD000008, 0x00000005 /* DBKIND */
+        ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
+        ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
+        ED 0xFD000018, 0x00000001 /* DBCKECNT */
+
+        mov     #100,r0
+WAIT_400NS:
+        dt      r0
+        bf      WAIT_400NS
+
+        ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
+        ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */
+        ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */
+        ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */
+        ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */
+        ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
+        ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
+        ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
+        ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */
+        ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */
+        ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */
+
+        mov     #100,r0
+WAIT_400NS_2:
+        dt      r0
+        bf      WAIT_400NS_2
+
+        ED 0xFD000010, 0x00000001 /* DBEN */
+        ED 0xFD000044, 0x0000050f /* DBRFPDN1 */
+        ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */
+
+        mov.l   DUMMY,r0
+        mov.l   @r0, r1 /* force single dummy read */
+
+        ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
+        ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
+        ED 0xFD000108, 0x00000080 /* DBPDCNT0 */
+        ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
+
+        rts
+         nop
+
+        .balign 4
+DUMMY:  .long   0xac400000
+FRQCRA: .long   0xa4150000
+KICK:   .long   0x80000000
+LSTATS: .long   0xa4150060
+
 ENTRY(ms7724se_sdram_leave_end)
diff --git a/arch/sh/boards/mach-se/7724/setup.c b/arch/sh/boards/mach-se/7724/setup.c
index ee5251f92811..563f3dcb1f9b 100644
--- a/arch/sh/boards/mach-se/7724/setup.c
+++ b/arch/sh/boards/mach-se/7724/setup.c
@@ -610,7 +610,8 @@ static int __init devices_setup(void)
         struct clk *clk;
 
         /* register board specific self-refresh code */
-        sh_mobile_register_self_refresh(SUSP_SH_STANDBY | SUSP_SH_SF,
+        sh_mobile_register_self_refresh(SUSP_SH_STANDBY | SUSP_SH_SF |
+                                        SUSP_SH_RSTANDBY,
                                         &ms7724se_sdram_enter_start,
                                         &ms7724se_sdram_enter_end,
                                         &ms7724se_sdram_leave_start,