| /* |
| * (C) Copyright 2009 Faraday Technology |
| * Po-Yu Chuang <ratbert@faraday-tech.com> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <config.h> |
| #include <version.h> |
| |
| #include <asm/macro.h> |
| #include <faraday/ftsdmc020.h> |
| |
| /* |
| * parameters for the SDRAM controller |
| */ |
| #define TP0_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_TP0) |
| #define TP1_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_TP1) |
| #define CR_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_CR) |
| #define B0_BSR_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_BANK0_BSR) |
| #define ACR_A (CONFIG_FTSDMC020_BASE + FTSDMC020_OFFSET_ACR) |
| |
| #define TP0_D CONFIG_SYS_FTSDMC020_TP0 |
| #define TP1_D CONFIG_SYS_FTSDMC020_TP1 |
| #define CR_D1 FTSDMC020_CR_IPREC |
| #define CR_D2 FTSDMC020_CR_ISMR |
| #define CR_D3 FTSDMC020_CR_IREF |
| |
| #define B0_BSR_D (CONFIG_SYS_FTSDMC020_BANK0_BSR | \ |
| FTSDMC020_BANK_BASE(PHYS_SDRAM_1)) |
| #define ACR_D FTSDMC020_ACR_TOC(0x18) |
| |
| /* |
| * numeric 7 segment display |
| */ |
| .macro led, num |
| write32 CONFIG_DEBUG_LED, \num |
| .endm |
| |
| /* |
| * Waiting for SDRAM to set up |
| */ |
| .macro wait_sdram |
| ldr r0, =CONFIG_FTSDMC020_BASE |
| 1: |
| ldr r1, [r0, #FTSDMC020_OFFSET_CR] |
| cmp r1, #0 |
| bne 1b |
| .endm |
| |
| .globl lowlevel_init |
| lowlevel_init: |
| mov r11, lr |
| |
| led 0x0 |
| |
| bl init_sdmc |
| |
| led 0x1 |
| |
| /* everything is fine now */ |
| mov lr, r11 |
| mov pc, lr |
| |
| /* |
| * memory initialization |
| */ |
| init_sdmc: |
| led 0x10 |
| |
| /* set SDRAM register */ |
| |
| write32 TP0_A, TP0_D |
| led 0x11 |
| |
| write32 TP1_A, TP1_D |
| led 0x12 |
| |
| /* set to precharge */ |
| write32 CR_A, CR_D1 |
| led 0x13 |
| |
| wait_sdram |
| led 0x14 |
| |
| /* set mode register */ |
| write32 CR_A, CR_D2 |
| led 0x15 |
| |
| wait_sdram |
| led 0x16 |
| |
| /* set to refresh */ |
| write32 CR_A, CR_D3 |
| led 0x17 |
| |
| wait_sdram |
| led 0x18 |
| |
| write32 B0_BSR_A, B0_BSR_D |
| led 0x19 |
| |
| write32 ACR_A, ACR_D |
| led 0x1a |
| |
| mov pc, lr |
