| John Rigby | 6895d45 | 2010-01-25 23:12:58 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * (C) Copyright 2009 DENX Software Engineering |
| 3 | * Author: John Rigby <jrigby@gmail.com> |
| 4 | * |
| 5 | * Based on U-Boot and RedBoot sources for several different i.mx |
| 6 | * platforms. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <asm/macro.h> |
| 25 | |
| 26 | .macro init_aips |
| 27 | write32 0x43f00000, 0x77777777 |
| 28 | write32 0x43f00004, 0x77777777 |
| 29 | write32 0x43f00000, 0x77777777 |
| 30 | write32 0x53f00004, 0x77777777 |
| 31 | .endm |
| 32 | |
| 33 | .macro init_max |
| 34 | write32 0x43f04000, 0x43210 |
| 35 | write32 0x43f04100, 0x43210 |
| 36 | write32 0x43f04200, 0x43210 |
| 37 | write32 0x43f04300, 0x43210 |
| 38 | write32 0x43f04400, 0x43210 |
| 39 | |
| 40 | write32 0x43f04010, 0x10 |
| 41 | write32 0x43f04110, 0x10 |
| 42 | write32 0x43f04210, 0x10 |
| 43 | write32 0x43f04310, 0x10 |
| 44 | write32 0x43f04410, 0x10 |
| 45 | |
| 46 | write32 0x43f04800, 0x0 |
| 47 | write32 0x43f04900, 0x0 |
| 48 | write32 0x43f04a00, 0x0 |
| 49 | write32 0x43f04b00, 0x0 |
| 50 | write32 0x43f04c00, 0x0 |
| 51 | .endm |
| 52 | |
| 53 | .macro init_m3if |
| 54 | write32 0xb8003000, 0x1 |
| 55 | .endm |
| 56 | |
| 57 | .macro init_clocks |
| 58 | /* |
| 59 | * clocks |
| 60 | * |
| 61 | * first enable CLKO debug output |
| 62 | * 0x40000000 enables the debug CLKO signal |
| 63 | * 0x05000000 sets CLKO divider to 6 |
| 64 | * 0x00600000 makes CLKO parent clk the USB clk |
| 65 | */ |
| 66 | write32 0x53f80064, 0x45600000 |
| 67 | write32 0x53f80008, 0x20034000 |
| 68 | |
| 69 | /* |
| 70 | * enable all implemented clocks in all three |
| 71 | * clock control registers |
| 72 | */ |
| 73 | write32 0x53f8000c, 0x1fffffff |
| 74 | write32 0x53f80010, 0xffffffff |
| 75 | write32 0x53f80014, 0xfdfff |
| 76 | .endm |
| 77 | |
| 78 | .macro init_ddrtype |
| 79 | /* |
| 80 | * ddr_type is 3.3v SDRAM |
| 81 | */ |
| 82 | write32 0x43fac454, 0x800 |
| 83 | .endm |
| 84 | |
| 85 | /* |
| 86 | * sdram controller init |
| 87 | */ |
| 88 | .macro init_sdram_bank bankaddr, ctl, cfg |
| 89 | ldr r0, =0xb8001000 |
| 90 | ldr r2, =\bankaddr |
| 91 | /* |
| 92 | * reset SDRAM controller |
| 93 | * then wait for initialization to complete |
| 94 | */ |
| 95 | ldr r1, =(1 << 1) |
| 96 | str r1, [r0, #0x10] |
| 97 | 1: ldr r3, [r0, #0x10] |
| 98 | tst r3, #(1 << 31) |
| 99 | beq 1b |
| 100 | |
| 101 | ldr r1, =0x95728 |
| 102 | str r1, [r0, #\cfg] /* config */ |
| 103 | |
| 104 | ldr r1, =0x92116480 /* control | precharge */ |
| 105 | str r1, [r0, #\ctl] /* write command to controller */ |
| 106 | str r1, [r2, #0x400] /* command encoded in address */ |
| 107 | |
| 108 | ldr r1, =0xa2116480 /* auto refresh */ |
| 109 | str r1, [r0, #\ctl] |
| 110 | ldrb r3, [r2] /* read dram twice to auto refresh */ |
| 111 | ldrb r3, [r2] |
| 112 | |
| 113 | ldr r1, =0xb2116480 /* control | load mode */ |
| 114 | str r1, [r0, #\ctl] /* write command to controller */ |
| 115 | strb r1, [r2, #0x33] /* command encoded in address */ |
| 116 | |
| 117 | ldr r1, =0x82116480 /* control | normal (0)*/ |
| 118 | str r1, [r0, #\ctl] /* write command to controller */ |
| 119 | .endm |
| 120 | |
| 121 | .globl lowlevel_init |
| 122 | lowlevel_init: |
| 123 | init_aips |
| 124 | init_max |
| 125 | init_m3if |
| 126 | init_clocks |
| 127 | |
| 128 | init_sdram_bank 0x80000000, 0x0, 0x4 |
| 129 | |
| 130 | init_sdram_bank 0x90000000, 0x8, 0xc |
| 131 | mov pc, lr |