1/* 2 * MS7724SE sdram self/auto-refresh setup code 3 * 4 * Copyright (C) 2009 Magnus Damm 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 11#include <linux/sys.h> 12#include <linux/errno.h> 13#include <linux/linkage.h> 14#include <asm/asm-offsets.h> 15#include <asm/suspend.h> 16#include <asm/romimage-macros.h> 17 18/* code to enter and leave self-refresh. must be self-contained. 19 * this code will be copied to on-chip memory and executed from there. 20 */ 21 .balign 4 22ENTRY(ms7724se_sdram_enter_start) 23 24 /* DBSC: put memory in self-refresh mode */ 25 26 ED 0xFD000010, 0x00000000 /* DBEN */ 27 ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ 28 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 29 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 30 ED 0xFD000040, 0x00000001 /* DBRFPDN0 */ 31 32 rts 33 nop 34 35ENTRY(ms7724se_sdram_enter_end) 36 37 .balign 4 38ENTRY(ms7724se_sdram_leave_start) 39 40 /* DBSC: put memory in auto-refresh mode */ 41 42 mov.l @(SH_SLEEP_MODE, r5), r0 43 tst #SUSP_SH_RSTANDBY, r0 44 bf resume_rstandby 45 46 ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ 47 WAIT 1 48 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 49 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 50 ED 0xFD000010, 0x00000001 /* DBEN */ 51 ED 0xFD000040, 0x00010000 /* DBRFPDN0 */ 52 53 rts 54 nop 55 56resume_rstandby: 57 58 /* CPG: setup clocks before restarting external memory */ 59 60 ED 0xA4150024, 0x00004000 /* PLLCR */ 61 62 mov.l FRQCRA,r0 63 mov.l @r0,r3 64 mov.l KICK,r1 65 or r1, r3 66 mov.l r3, @r0 67 68 mov.l LSTATS,r0 69 mov #1,r1 70WAIT_LSTATS: 71 mov.l @r0,r3 72 tst r1,r3 73 bf WAIT_LSTATS 74 75 /* DBSC: re-initialize and put in auto-refresh */ 76 77 ED 0xFD000108, 0x00000181 /* DBPDCNT0 */ 78 ED 0xFD000020, 0x015B0002 /* DBCONF */ 79 ED 0xFD000030, 0x03071502 /* DBTR0 */ 80 ED 0xFD000034, 0x02020102 /* DBTR1 */ 81 ED 0xFD000038, 0x01090405 /* DBTR2 */ 82 ED 0xFD00003C, 0x00000002 /* DBTR3 */ 83 ED 0xFD000008, 0x00000005 /* DBKIND */ 84 ED 0xFD000040, 0x00000001 /* DBRFPDN0 */ 85 ED 0xFD000040, 0x00000000 /* DBRFPDN0 */ 86 ED 0xFD000018, 0x00000001 /* DBCKECNT */ 87 88 mov #100,r0 89WAIT_400NS: 90 dt r0 91 bf WAIT_400NS 92 93 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 94 ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */ 95 ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */ 96 ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */ 97 ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */ 98 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 99 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 100 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 101 ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */ 102 ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */ 103 ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */ 104 105 mov #100,r0 106WAIT_400NS_2: 107 dt r0 108 bf WAIT_400NS_2 109 110 ED 0xFD000010, 0x00000001 /* DBEN */ 111 ED 0xFD000044, 0x0000050f /* DBRFPDN1 */ 112 ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */ 113 114 mov.l DUMMY,r0 115 mov.l @r0, r1 /* force single dummy read */ 116 117 ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */ 118 ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */ 119 ED 0xFD000108, 0x00000080 /* DBPDCNT0 */ 120 ED 0xFD000040, 0x00010000 /* DBRFPDN0 */ 121 122 rts 123 nop 124 125 .balign 4 126DUMMY: .long 0xac400000 127FRQCRA: .long 0xa4150000 128KICK: .long 0x80000000 129LSTATS: .long 0xa4150060 130 131ENTRY(ms7724se_sdram_leave_end) 132