| Ilya Yanok | 509a1ea | 2009-02-10 00:22:31 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009, Emcraft Systems, Ilya Yanok <yanok@emcraft.com> |
| 3 | * |
| 4 | * Based on board/freescale/mx31ads/lowlevel_init.S |
| 5 | * by Guennadi Liakhovetski. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License as |
| 9 | * published by the Free Software Foundation; either version 2 of |
| 10 | * the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 20 | * MA 02111-1307 USA |
| 21 | */ |
| 22 | |
| 23 | #include <asm/arch/mx31-regs.h> |
| 24 | |
| 25 | .macro REG reg, val |
| 26 | ldr r2, =\reg |
| 27 | ldr r3, =\val |
| 28 | str r3, [r2] |
| 29 | .endm |
| 30 | |
| 31 | .macro REG8 reg, val |
| 32 | ldr r2, =\reg |
| 33 | ldr r3, =\val |
| 34 | strb r3, [r2] |
| 35 | .endm |
| 36 | |
| 37 | .macro DELAY loops |
| 38 | ldr r2, =\loops |
| 39 | 1: |
| 40 | subs r2, r2, #1 |
| 41 | nop |
| 42 | bcs 1b |
| 43 | .endm |
| 44 | |
| 45 | /* RedBoot: To support 133MHz DDR */ |
| 46 | .macro init_drive_strength |
| 47 | /* |
| 48 | * Disable maximum drive strength SDRAM/DDR lines by clearing DSE1 bits |
| 49 | * in SW_PAD_CTL registers |
| 50 | */ |
| 51 | |
| 52 | /* SDCLK */ |
| 53 | ldr r1, =IOMUXC_SW_PAD_CTL(0x2b) |
| 54 | ldr r0, [r1, #0x6C] |
| 55 | bic r0, r0, #(1 << 12) |
| 56 | str r0, [r1, #0x6C] |
| 57 | |
| 58 | /* CAS */ |
| 59 | ldr r0, [r1, #0x70] |
| 60 | bic r0, r0, #(1 << 22) |
| 61 | str r0, [r1, #0x70] |
| 62 | |
| 63 | /* RAS */ |
| 64 | ldr r0, [r1, #0x74] |
| 65 | bic r0, r0, #(1 << 2) |
| 66 | str r0, [r1, #0x74] |
| 67 | |
| 68 | /* CS2 (CSD0) */ |
| 69 | ldr r0, [r1, #0x7C] |
| 70 | bic r0, r0, #(1 << 22) |
| 71 | str r0, [r1, #0x7C] |
| 72 | |
| 73 | /* DQM3 */ |
| 74 | ldr r0, [r1, #0x84] |
| 75 | bic r0, r0, #(1 << 22) |
| 76 | str r0, [r1, #0x84] |
| 77 | |
| 78 | /* DQM2, DQM1, DQM0, SD31-SD0, A25-A0, MA10 (0x288..0x2DC) */ |
| 79 | ldr r2, =22 /* (0x2E0 - 0x288) / 4 = 22 */ |
| 80 | pad_loop: |
| 81 | ldr r0, [r1, #0x88] |
| 82 | bic r0, r0, #(1 << 22) |
| 83 | bic r0, r0, #(1 << 12) |
| 84 | bic r0, r0, #(1 << 2) |
| 85 | str r0, [r1, #0x88] |
| 86 | add r1, r1, #4 |
| 87 | subs r2, r2, #0x1 |
| 88 | bne pad_loop |
| 89 | .endm /* init_drive_strength */ |
| 90 | |
| 91 | .globl lowlevel_init |
| 92 | lowlevel_init: |
| 93 | |
| 94 | init_drive_strength |
| 95 | |
| 96 | /* Image Processing Unit: */ |
| 97 | /* Too early to switch display on? */ |
| 98 | /* Switch on Display Interface */ |
| 99 | REG IPU_CONF, IPU_CONF_DI_EN |
| 100 | /* Clock Control Module: */ |
| 101 | REG CCM_CCMR, 0x074B0BF5 /* Use CKIH, MCU PLL off */ |
| 102 | |
| 103 | DELAY 0x40000 |
| 104 | |
| 105 | REG CCM_CCMR, 0x074B0BF5 | CCMR_MPE /* MCU PLL on */ |
| 106 | /* Switch to MCU PLL */ |
| 107 | REG CCM_CCMR, (0x074B0BF5 | CCMR_MPE) & ~CCMR_MDS |
| 108 | |
| 109 | /* 399-133-66.5 */ |
| 110 | ldr r0, =CCM_BASE |
| 111 | ldr r1, =0xFF871650 |
| 112 | /* PDR0 */ |
| 113 | str r1, [r0, #0x4] |
| 114 | ldr r1, MPCTL_PARAM_399 |
| 115 | /* MPCTL */ |
| 116 | str r1, [r0, #0x10] |
| 117 | |
| 118 | /* Set UPLL=240MHz, USB=60MHz */ |
| 119 | ldr r1, =0x49FCFE7F |
| 120 | /* PDR1 */ |
| 121 | str r1, [r0, #0x8] |
| 122 | ldr r1, UPCTL_PARAM_240 |
| 123 | /* UPCTL */ |
| 124 | str r1, [r0, #0x14] |
| 125 | /* default CLKO to 1/8 of the ARM core */ |
| 126 | mov r1, #0x00000208 |
| 127 | /* COSR */ |
| 128 | str r1, [r0, #0x1c] |
| 129 | |
| 130 | /* Default: 1, 4, 12, 1 */ |
| 131 | REG CCM_SPCTL, PLL_PD(1) | PLL_MFD(4) | PLL_MFI(12) | PLL_MFN(1) |
| 132 | |
| 133 | /* B8xxxxxx - NAND, 8xxxxxxx - CSD0 RAM */ |
| 134 | REG 0xB8001010, 0x00000004 |
| 135 | REG 0xB8001004, ((3 << 21) | /* tXP */ \ |
| 136 | (0 << 20) | /* tWTR */ \ |
| 137 | (2 << 18) | /* tRP */ \ |
| 138 | (1 << 16) | /* tMRD */ \ |
| 139 | (0 << 15) | /* tWR */ \ |
| 140 | (5 << 12) | /* tRAS */ \ |
| 141 | (1 << 10) | /* tRRD */ \ |
| 142 | (3 << 8) | /* tCAS */ \ |
| 143 | (2 << 4) | /* tRCD */ \ |
| 144 | (7 << 0) /* tRC */ ) |
| 145 | REG 0xB8001000, 0x92100000 |
| 146 | REG 0x80000f00, 0x12344321 |
| 147 | REG 0xB8001000, 0xa2100000 |
| 148 | REG 0x80000000, 0x12344321 |
| 149 | REG 0x80000000, 0x12344321 |
| 150 | REG 0xB8001000, 0xb2100000 |
| 151 | REG8 0x80000033, 0xda |
| 152 | REG8 0x81000000, 0xff |
| 153 | REG 0xB8001000, ((1 << 31) | \ |
| 154 | (0 << 28) | \ |
| 155 | (0 << 27) | \ |
| 156 | (3 << 24) | /* 14 rows */ \ |
| 157 | (2 << 20) | /* 10 cols */ \ |
| 158 | (2 << 16) | \ |
| 159 | (4 << 13) | /* 3.91us (64ms/16384) */ \ |
| 160 | (0 << 10) | \ |
| 161 | (0 << 8) | \ |
| 162 | (1 << 7) | \ |
| 163 | (0 << 0)) |
| 164 | REG 0x80000000, 0xDEADBEEF |
| 165 | REG 0xB8001010, 0x0000000c |
| 166 | |
| 167 | mov pc, lr |
| 168 | |
| 169 | MPCTL_PARAM_399: |
| 170 | .word (((1 - 1) << 26) + ((52 - 1) << 16) + (7 << 10) + (35 << 0)) |
| 171 | UPCTL_PARAM_240: |
| 172 | .word (((2 - 1) << 26) + ((13 - 1) << 16) + (9 << 10) + (3 << 0)) |