| John Rigby | 6478a75 | 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> |
| Benoît Thébaudeau | f58c48e | 2012-08-20 09:00:57 +0000 | [diff] [blame] | 25 | #include <asm/arch/macro.h> |
| John Rigby | 6478a75 | 2010-01-25 23:12:58 -0700 | [diff] [blame] | 26 | |
| 27 | .macro init_clocks |
| 28 | /* |
| 29 | * clocks |
| 30 | * |
| 31 | * first enable CLKO debug output |
| 32 | * 0x40000000 enables the debug CLKO signal |
| 33 | * 0x05000000 sets CLKO divider to 6 |
| 34 | * 0x00600000 makes CLKO parent clk the USB clk |
| 35 | */ |
| 36 | write32 0x53f80064, 0x45600000 |
| Benoît Thébaudeau | f58c48e | 2012-08-20 09:00:57 +0000 | [diff] [blame] | 37 | |
| 38 | /* CCTL: ARM = 399 MHz, AHB = 133 MHz */ |
| John Rigby | 6478a75 | 2010-01-25 23:12:58 -0700 | [diff] [blame] | 39 | write32 0x53f80008, 0x20034000 |
| 40 | |
| 41 | /* |
| Benoît Thébaudeau | 9cb0878 | 2012-08-08 03:55:32 +0000 | [diff] [blame] | 42 | * PCDR2: NFC = 33.25 MHz |
| 43 | * This is required for the NAND Flash of this board, which is a Samsung |
| 44 | * K9F1G08U0B with 25-ns R/W cycle times, in order to make it work with |
| 45 | * the NFC driver in symmetric (i.e. one-cycle) mode. |
| 46 | */ |
| 47 | write32 0x53f80020, 0x01010103 |
| 48 | |
| 49 | /* |
| John Rigby | 6478a75 | 2010-01-25 23:12:58 -0700 | [diff] [blame] | 50 | * enable all implemented clocks in all three |
| 51 | * clock control registers |
| 52 | */ |
| 53 | write32 0x53f8000c, 0x1fffffff |
| 54 | write32 0x53f80010, 0xffffffff |
| 55 | write32 0x53f80014, 0xfdfff |
| 56 | .endm |
| 57 | |
| 58 | .macro init_ddrtype |
| 59 | /* |
| 60 | * ddr_type is 3.3v SDRAM |
| 61 | */ |
| 62 | write32 0x43fac454, 0x800 |
| 63 | .endm |
| 64 | |
| 65 | /* |
| 66 | * sdram controller init |
| 67 | */ |
| 68 | .macro init_sdram_bank bankaddr, ctl, cfg |
| 69 | ldr r0, =0xb8001000 |
| 70 | ldr r2, =\bankaddr |
| 71 | /* |
| 72 | * reset SDRAM controller |
| 73 | * then wait for initialization to complete |
| 74 | */ |
| 75 | ldr r1, =(1 << 1) |
| 76 | str r1, [r0, #0x10] |
| 77 | 1: ldr r3, [r0, #0x10] |
| 78 | tst r3, #(1 << 31) |
| 79 | beq 1b |
| 80 | |
| 81 | ldr r1, =0x95728 |
| 82 | str r1, [r0, #\cfg] /* config */ |
| 83 | |
| 84 | ldr r1, =0x92116480 /* control | precharge */ |
| 85 | str r1, [r0, #\ctl] /* write command to controller */ |
| 86 | str r1, [r2, #0x400] /* command encoded in address */ |
| 87 | |
| 88 | ldr r1, =0xa2116480 /* auto refresh */ |
| 89 | str r1, [r0, #\ctl] |
| 90 | ldrb r3, [r2] /* read dram twice to auto refresh */ |
| 91 | ldrb r3, [r2] |
| 92 | |
| 93 | ldr r1, =0xb2116480 /* control | load mode */ |
| 94 | str r1, [r0, #\ctl] /* write command to controller */ |
| 95 | strb r1, [r2, #0x33] /* command encoded in address */ |
| 96 | |
| 97 | ldr r1, =0x82116480 /* control | normal (0)*/ |
| 98 | str r1, [r0, #\ctl] /* write command to controller */ |
| 99 | .endm |
| 100 | |
| 101 | .globl lowlevel_init |
| 102 | lowlevel_init: |
| 103 | init_aips |
| 104 | init_max |
| 105 | init_m3if |
| 106 | init_clocks |
| 107 | |
| 108 | init_sdram_bank 0x80000000, 0x0, 0x4 |
| 109 | |
| 110 | init_sdram_bank 0x90000000, 0x8, 0xc |
| 111 | mov pc, lr |