sh: ecovec r-standby support

[firefly-linux-kernel-4.4.55.git] / arch / sh / boards / mach-ecovec24 / sdram.S

diff --git a/arch/sh/boards/mach-ecovec24/sdram.S b/arch/sh/boards/mach-ecovec24/sdram.S
index 833440044407598da49dcac134abd9ef0f9da513..3963c6f23d52bb5fa8a7e7e60b9d18bb5677d498 100644 (file)
--- a/arch/sh/boards/mach-ecovec24/sdram.S
+++ b/arch/sh/boards/mach-ecovec24/sdram.S
@@ -37,6 +37,10 @@ ENTRY(ecovec24_sdram_enter_end)
        .balign 4
 ENTRY(ecovec24_sdram_leave_start)
 
+       mov.l   @(SH_SLEEP_MODE, r5), r0
+       tst     #SUSP_SH_RSTANDBY, r0
+       bf      resume_rstandby
+
        /* DBSC: put memory in auto-refresh mode */
 
        ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
@@ -49,4 +53,59 @@ ENTRY(ecovec24_sdram_leave_start)
        rts
         nop
 
+resume_rstandby:
+
+       /* 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
+
 ENTRY(ecovec24_sdram_leave_end)