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- /*
- * MS7724SE sdram self/auto-refresh setup code
- *
- * Copyright (C) 2009 Magnus Damm
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
- #include <linux/sys.h>
- #include <linux/errno.h>
- #include <linux/linkage.h>
- #include <asm/asm-offsets.h>
- #include <asm/suspend.h>
- #include <asm/romimage-macros.h>
- /* code to enter and leave self-refresh. must be self-contained.
- * this code will be copied to on-chip memory and executed from there.
- */
- .balign 4
- ENTRY(ms7724se_sdram_enter_start)
- /* DBSC: put memory in self-refresh mode */
- ED 0xFD000010, 0x00000000 /* DBEN */
- ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
- ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
- ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
- ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
- rts
- nop
- ENTRY(ms7724se_sdram_enter_end)
- .balign 4
- 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) */
- ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
- ED 0xFD000010, 0x00000001 /* DBEN */
- ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
- 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)
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