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| /*
| * Board-specific sbf ddr/sdram init.
| *
| * (C) Copyright 2017 Angelo Dureghello <angelo@sysam.it>
| *
| * SPDX-License-Identifier: GPL-2.0+
| */
|
| #include <config.h>
|
| .global sbf_dram_init
| .text
|
| sbf_dram_init:
| /* Dram Initialization a1, a2, and d0 */
| /* mscr sdram */
| move.l #0xFC0A4074, %a1
| move.b #(CONFIG_SYS_SDRAM_DRV_STRENGTH), (%a1)
| nop
|
| /* SDRAM Chip 0 and 1 */
| move.l #0xFC0B8110, %a1
| move.l #0xFC0B8114, %a2
|
| /* calculate the size */
| move.l #0x13, %d1
| move.l #(CONFIG_SYS_SDRAM_SIZE), %d2
| #ifdef CONFIG_SYS_SDRAM_BASE1
| lsr.l #1, %d2
| #endif
|
| dramsz_loop:
| lsr.l #1, %d2
| add.l #1, %d1
| cmp.l #1, %d2
| bne dramsz_loop
| #ifdef CONFIG_SYS_NAND_BOOT
| beq asm_nand_chk_status
| #endif
| /* SDRAM Chip 0 and 1 */
| move.l #(CONFIG_SYS_SDRAM_BASE), (%a1)
| or.l %d1, (%a1)
| #ifdef CONFIG_SYS_SDRAM_BASE1
| move.l #(CONFIG_SYS_SDRAM_BASE1), (%a2)
| or.l %d1, (%a2)
| #endif
| nop
|
| /* dram cfg1 and cfg2 */
| move.l #0xFC0B8008, %a1
| move.l #(CONFIG_SYS_SDRAM_CFG1), (%a1)
| nop
| move.l #0xFC0B800C, %a2
| move.l #(CONFIG_SYS_SDRAM_CFG2), (%a2)
| nop
|
| move.l #0xFC0B8000, %a1 /* Mode */
| move.l #0xFC0B8004, %a2 /* Ctrl */
|
| /* Issue PALL */
| move.l #(CONFIG_SYS_SDRAM_CTRL + 2), (%a2)
| nop
|
| move.l #1000, %d1
| bsr asm_delay
|
| /* Issue PALL */
| move.l #(CONFIG_SYS_SDRAM_CTRL + 2), (%a2)
| nop
|
| /* Perform two refresh cycles */
| move.l #(CONFIG_SYS_SDRAM_CTRL + 4), %d0
| nop
| move.l %d0, (%a2)
| move.l %d0, (%a2)
| nop
|
| /* Issue LEMR */
| move.l #(CONFIG_SYS_SDRAM_MODE), (%a1)
| nop
| move.l #(CONFIG_SYS_SDRAM_EMOD), (%a1)
|
| move.l #500, %d1
| bsr asm_delay
|
| move.l #(CONFIG_SYS_SDRAM_CTRL), %d1
| and.l #0x7FFFFFFF, %d1
|
| or.l #0x10000C00, %d1
|
| move.l %d1, (%a2)
| nop
|
| move.l #2000, %d1
| bsr asm_delay
|
| rts
|
|
