| Angelo Dureghello | 89ae64c | 2017-05-14 21:42:27 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Board-specific sbf ddr/sdram init. |
| 3 | * |
| 4 | * (C) Copyright 2017 Angelo Dureghello <angelo@sysam.it> |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0+ |
| 7 | */ |
| 8 | |
| 9 | #include <config.h> |
| 10 | |
| 11 | .global sbf_dram_init |
| 12 | .text |
| 13 | |
| 14 | sbf_dram_init: |
| 15 | /* Dram Initialization a1, a2, and d0 */ |
| 16 | /* mscr sdram */ |
| 17 | move.l #0xFC0A4074, %a1 |
| 18 | move.b #(CONFIG_SYS_SDRAM_DRV_STRENGTH), (%a1) |
| 19 | nop |
| 20 | |
| 21 | /* SDRAM Chip 0 and 1 */ |
| 22 | move.l #0xFC0B8110, %a1 |
| 23 | move.l #0xFC0B8114, %a2 |
| 24 | |
| 25 | /* calculate the size */ |
| 26 | move.l #0x13, %d1 |
| 27 | move.l #(CONFIG_SYS_SDRAM_SIZE), %d2 |
| 28 | #ifdef CONFIG_SYS_SDRAM_BASE1 |
| 29 | lsr.l #1, %d2 |
| 30 | #endif |
| 31 | |
| 32 | dramsz_loop: |
| 33 | lsr.l #1, %d2 |
| 34 | add.l #1, %d1 |
| 35 | cmp.l #1, %d2 |
| 36 | bne dramsz_loop |
| 37 | #ifdef CONFIG_SYS_NAND_BOOT |
| 38 | beq asm_nand_chk_status |
| 39 | #endif |
| 40 | /* SDRAM Chip 0 and 1 */ |
| 41 | move.l #(CONFIG_SYS_SDRAM_BASE), (%a1) |
| 42 | or.l %d1, (%a1) |
| 43 | #ifdef CONFIG_SYS_SDRAM_BASE1 |
| 44 | move.l #(CONFIG_SYS_SDRAM_BASE1), (%a2) |
| 45 | or.l %d1, (%a2) |
| 46 | #endif |
| 47 | nop |
| 48 | |
| 49 | /* dram cfg1 and cfg2 */ |
| 50 | move.l #0xFC0B8008, %a1 |
| 51 | move.l #(CONFIG_SYS_SDRAM_CFG1), (%a1) |
| 52 | nop |
| 53 | move.l #0xFC0B800C, %a2 |
| 54 | move.l #(CONFIG_SYS_SDRAM_CFG2), (%a2) |
| 55 | nop |
| 56 | |
| 57 | move.l #0xFC0B8000, %a1 /* Mode */ |
| 58 | move.l #0xFC0B8004, %a2 /* Ctrl */ |
| 59 | |
| 60 | /* Issue PALL */ |
| 61 | move.l #(CONFIG_SYS_SDRAM_CTRL + 2), (%a2) |
| 62 | nop |
| 63 | |
| 64 | move.l #1000, %d1 |
| 65 | bsr asm_delay |
| 66 | |
| 67 | /* Issue PALL */ |
| 68 | move.l #(CONFIG_SYS_SDRAM_CTRL + 2), (%a2) |
| 69 | nop |
| 70 | |
| 71 | /* Perform two refresh cycles */ |
| 72 | move.l #(CONFIG_SYS_SDRAM_CTRL + 4), %d0 |
| 73 | nop |
| 74 | move.l %d0, (%a2) |
| 75 | move.l %d0, (%a2) |
| 76 | nop |
| 77 | |
| 78 | /* Issue LEMR */ |
| 79 | move.l #(CONFIG_SYS_SDRAM_MODE), (%a1) |
| 80 | nop |
| 81 | move.l #(CONFIG_SYS_SDRAM_EMOD), (%a1) |
| 82 | |
| 83 | move.l #500, %d1 |
| 84 | bsr asm_delay |
| 85 | |
| 86 | move.l #(CONFIG_SYS_SDRAM_CTRL), %d1 |
| 87 | and.l #0x7FFFFFFF, %d1 |
| 88 | |
| 89 | or.l #0x10000C00, %d1 |
| 90 | |
| 91 | move.l %d1, (%a2) |
| 92 | nop |
| 93 | |
| 94 | move.l #2000, %d1 |
| 95 | bsr asm_delay |
| 96 | |
| 97 | rts |