1 /* SPDX-License-Identifier: GPL-2.0 2 * 3 * MS7724SE 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(ms7724se_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(ms7724se_sdram_enter_end) 33 34 .balign 4 35 ENTRY(ms7724se_sdram_leave_start) 36 37 /* DBSC: put memory in auto-refresh mode */ 38 39 mov.l @(SH_SLEEP_MODE, r5), r0 40 tst #SUSP_SH_RSTANDBY, r0 41 bf resume_rstandby 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 /* CPG: setup clocks before restarting external memory */ 56 57 ED 0xA4150024, 0x00004000 /* PLLCR */ 58 59 mov.l FRQCRA,r0 60 mov.l @r0,r3 61 mov.l KICK,r1 62 or r1, r3 63 mov.l r3, @r0 64 65 mov.l LSTATS,r0 66 mov #1,r1 67 WAIT_LSTATS: 68 mov.l @r0,r3 69 tst r1,r3 70 bf WAIT_LSTATS 71 72 /* DBSC: re-initialize and put in auto-refresh */ 73 74 ED 0xFD000108, 0x00000181 /* DBPDCNT0 */ 75 ED 0xFD000020, 0x015B0002 /* DBCONF */ 76 ED 0xFD000030, 0x03071502 /* DBTR0 */ 77 ED 0xFD000034, 0x02020102 /* DBTR1 */ 78 ED 0xFD000038, 0x01090405 /* DBTR2 */ 79 ED 0xFD00003C, 0x00000002 /* DBTR3 */ 80 ED 0xFD000008, 0x00000005 /* DBKIND */ 81 ED 0xFD000040, 0x00000001 /* DBRFPDN0 */ 82 ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ 83 ED 0xFD000018, 0x00000001 /* DBCKECNT */ 84 85 mov #100,r0 86 WAIT_400NS: 87 dt r0 88 bf WAIT_400NS 89 90 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 91 ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */ 92 ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */ 93 ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */ 94 ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */ 95 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 96 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 97 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 98 ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */ 99 ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */ 100 ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */ 101 102 mov #100,r0 103 WAIT_400NS_2: 104 dt r0 105 bf WAIT_400NS_2 106 107 ED 0xFD000010, 0x00000001 /* DBEN */ 108 ED 0xFD000044, 0x0000050f /* DBRFPDN1 */ 109 ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */ 110 111 mov.l DUMMY,r0 112 mov.l @r0, r1 /* force single dummy read */ 113 114 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 115 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 116 ED 0xFD000108, 0x00000080 /* DBPDCNT0 */ 117 ED 0xFD000040, 0x00010000 /* DBRFPDN0 */ 118 119 rts 120 nop 121 122 .balign 4 123 DUMMY: .long 0xac400000 124 FRQCRA: .long 0xa4150000 125 KICK: .long 0x80000000 126 LSTATS: .long 0xa4150060 127 128 ENTRY(ms7724se_sdram_leave_end) 129