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108 lines
2.7 KiB
108 lines
2.7 KiB
/* SPDX-License-Identifier: GPL-2.0 |
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* |
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* Ecovec24 sdram self/auto-refresh setup code |
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* |
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* Copyright (C) 2009 Magnus Damm |
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*/ |
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#include <linux/sys.h> |
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#include <linux/errno.h> |
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#include <linux/linkage.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/suspend.h> |
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#include <asm/romimage-macros.h> |
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/* code to enter and leave self-refresh. must be self-contained. |
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* this code will be copied to on-chip memory and executed from there. |
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*/ |
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.balign 4 |
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ENTRY(ecovec24_sdram_enter_start) |
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/* DBSC: put memory in self-refresh mode */ |
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ED 0xFD000010, 0x00000000 /* DBEN */ |
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ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ |
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ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ |
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ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ |
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ED 0xFD000040, 0x00000001 /* DBRFPDN0 */ |
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rts |
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nop |
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ENTRY(ecovec24_sdram_enter_end) |
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.balign 4 |
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ENTRY(ecovec24_sdram_leave_start) |
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mov.l @(SH_SLEEP_MODE, r5), r0 |
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tst #SUSP_SH_RSTANDBY, r0 |
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bf resume_rstandby |
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/* DBSC: put memory in auto-refresh mode */ |
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ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ |
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WAIT 1 |
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ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ |
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ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ |
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ED 0xFD000010, 0x00000001 /* DBEN */ |
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ED 0xFD000040, 0x00010000 /* DBRFPDN0 */ |
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rts |
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nop |
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resume_rstandby: |
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/* DBSC: re-initialize and put in auto-refresh */ |
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ED 0xFD000108, 0x00000181 /* DBPDCNT0 */ |
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ED 0xFD000020, 0x015B0002 /* DBCONF */ |
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ED 0xFD000030, 0x03071502 /* DBTR0 */ |
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ED 0xFD000034, 0x02020102 /* DBTR1 */ |
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ED 0xFD000038, 0x01090405 /* DBTR2 */ |
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ED 0xFD00003C, 0x00000002 /* DBTR3 */ |
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ED 0xFD000008, 0x00000005 /* DBKIND */ |
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ED 0xFD000040, 0x00000001 /* DBRFPDN0 */ |
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ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ |
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ED 0xFD000018, 0x00000001 /* DBCKECNT */ |
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mov #100,r0 |
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WAIT_400NS: |
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dt r0 |
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bf WAIT_400NS |
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ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ |
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ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */ |
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ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */ |
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ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */ |
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ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */ |
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ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ |
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ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ |
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ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ |
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ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */ |
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ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */ |
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ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */ |
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mov #100,r0 |
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WAIT_400NS_2: |
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dt r0 |
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bf WAIT_400NS_2 |
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ED 0xFD000010, 0x00000001 /* DBEN */ |
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ED 0xFD000044, 0x0000050f /* DBRFPDN1 */ |
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ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */ |
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mov.l DUMMY,r0 |
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mov.l @r0, r1 /* force single dummy read */ |
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ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ |
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ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ |
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ED 0xFD000108, 0x00000080 /* DBPDCNT0 */ |
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ED 0xFD000040, 0x00010000 /* DBRFPDN0 */ |
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rts |
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nop |
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.balign 4 |
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DUMMY: .long 0xac400000 |
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ENTRY(ecovec24_sdram_leave_end)
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