| /* |
| * (C) Copyright 2009 DENX Software Engineering |
| * Author: John Rigby <jrigby@gmail.com> |
| * |
| * Based on U-Boot and RedBoot sources for several different i.mx |
| * platforms. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <asm/macro.h> |
| #include <asm/arch/macro.h> |
| |
| .macro init_clocks |
| /* |
| * clocks |
| * |
| * first enable CLKO debug output |
| * 0x40000000 enables the debug CLKO signal |
| * 0x05000000 sets CLKO divider to 6 |
| * 0x00600000 makes CLKO parent clk the USB clk |
| */ |
| write32 0x53f80064, 0x45600000 |
| |
| /* CCTL: ARM = 399 MHz, AHB = 133 MHz */ |
| write32 0x53f80008, 0x20034000 |
| |
| /* |
| * PCDR2: NFC = 33.25 MHz |
| * This is required for the NAND Flash of this board, which is a Samsung |
| * K9F1G08U0B with 25-ns R/W cycle times, in order to make it work with |
| * the NFC driver in symmetric (i.e. one-cycle) mode. |
| */ |
| write32 0x53f80020, 0x01010103 |
| |
| /* |
| * enable all implemented clocks in all three |
| * clock control registers |
| */ |
| write32 0x53f8000c, 0x1fffffff |
| write32 0x53f80010, 0xffffffff |
| write32 0x53f80014, 0xfdfff |
| .endm |
| |
| .macro init_ddrtype |
| /* |
| * ddr_type is 3.3v SDRAM |
| */ |
| write32 0x43fac454, 0x800 |
| .endm |
| |
| /* |
| * sdram controller init |
| */ |
| .macro init_sdram_bank bankaddr, ctl, cfg |
| ldr r0, =0xb8001000 |
| ldr r2, =\bankaddr |
| /* |
| * reset SDRAM controller |
| * then wait for initialization to complete |
| */ |
| ldr r1, =(1 << 1) |
| str r1, [r0, #0x10] |
| 1: ldr r3, [r0, #0x10] |
| tst r3, #(1 << 31) |
| beq 1b |
| |
| ldr r1, =0x95728 |
| str r1, [r0, #\cfg] /* config */ |
| |
| ldr r1, =0x92116480 /* control | precharge */ |
| str r1, [r0, #\ctl] /* write command to controller */ |
| str r1, [r2, #0x400] /* command encoded in address */ |
| |
| ldr r1, =0xa2116480 /* auto refresh */ |
| str r1, [r0, #\ctl] |
| ldrb r3, [r2] /* read dram twice to auto refresh */ |
| ldrb r3, [r2] |
| |
| ldr r1, =0xb2116480 /* control | load mode */ |
| str r1, [r0, #\ctl] /* write command to controller */ |
| strb r1, [r2, #0x33] /* command encoded in address */ |
| |
| ldr r1, =0x82116480 /* control | normal (0)*/ |
| str r1, [r0, #\ctl] /* write command to controller */ |
| .endm |
| |
| .globl lowlevel_init |
| lowlevel_init: |
| init_aips |
| init_max |
| init_m3if |
| init_clocks |
| |
| init_sdram_bank 0x80000000, 0x0, 0x4 |
| |
| init_sdram_bank 0x90000000, 0x8, 0xc |
| mov pc, lr |
