1 /* SPDX-License-Identifier: GPL-2.0 2 * 3 * Ecovec24 sdram self/auto-refresh setup code 4 * 5 * Copyright (C) 2009 Magnus Damm 6 */ 7 8 #include <linux/sys.h> 9 #include <linux/errno.h> 10 #include <linux/linkage.h> 11 #include <asm/asm-offsets.h> 12 #include <asm/suspend.h> 13 #include <asm/romimage-macros.h> 14 15 /* code to enter and leave self-refresh. must be self-contained. 16 * this code will be copied to on-chip memory and executed from there. 17 */ 18 .balign 4 19 ENTRY(ecovec24_sdram_enter_start) 20 21 /* DBSC: put memory in self-refresh mode */ 22 23 ED 0xFD000010, 0x00000000 /* DBEN */ 24 ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ 25 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 26 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 27 ED 0xFD000040, 0x00000001 /* DBRFPDN0 */ 28 29 rts 30 nop 31 32 ENTRY(ecovec24_sdram_enter_end) 33 34 .balign 4 35 ENTRY(ecovec24_sdram_leave_start) 36 37 mov.l @(SH_SLEEP_MODE, r5), r0 38 tst #SUSP_SH_RSTANDBY, r0 39 bf resume_rstandby 40 41 /* DBSC: put memory in auto-refresh mode */ 42 43 ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ 44 WAIT 1 45 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 46 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 47 ED 0xFD000010, 0x00000001 /* DBEN */ 48 ED 0xFD000040, 0x00010000 /* DBRFPDN0 */ 49 50 rts 51 nop 52 53 resume_rstandby: 54 55 /* DBSC: re-initialize and put in auto-refresh */ 56 57 ED 0xFD000108, 0x00000181 /* DBPDCNT0 */ 58 ED 0xFD000020, 0x015B0002 /* DBCONF */ 59 ED 0xFD000030, 0x03071502 /* DBTR0 */ 60 ED 0xFD000034, 0x02020102 /* DBTR1 */ 61 ED 0xFD000038, 0x01090405 /* DBTR2 */ 62 ED 0xFD00003C, 0x00000002 /* DBTR3 */ 63 ED 0xFD000008, 0x00000005 /* DBKIND */ 64 ED 0xFD000040, 0x00000001 /* DBRFPDN0 */ 65 ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ 66 ED 0xFD000018, 0x00000001 /* DBCKECNT */ 67 68 mov #100,r0 69 WAIT_400NS: 70 dt r0 71 bf WAIT_400NS 72 73 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 74 ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */ 75 ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */ 76 ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */ 77 ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */ 78 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 79 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 80 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 81 ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */ 82 ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */ 83 ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */ 84 85 mov #100,r0 86 WAIT_400NS_2: 87 dt r0 88 bf WAIT_400NS_2 89 90 ED 0xFD000010, 0x00000001 /* DBEN */ 91 ED 0xFD000044, 0x0000050f /* DBRFPDN1 */ 92 ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */ 93 94 mov.l DUMMY,r0 95 mov.l @r0, r1 /* force single dummy read */ 96 97 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 98 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 99 ED 0xFD000108, 0x00000080 /* DBPDCNT0 */ 100 ED 0xFD000040, 0x00010000 /* DBRFPDN0 */ 101 102 rts 103 nop 104 105 .balign 4 106 DUMMY: .long 0xac400000 107 108 ENTRY(ecovec24_sdram_leave_end) 109