diff options
Diffstat (limited to 'board/mx1fs2/lowlevel_init.S')
| -rw-r--r-- | board/mx1fs2/lowlevel_init.S | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/board/mx1fs2/lowlevel_init.S b/board/mx1fs2/lowlevel_init.S deleted file mode 100644 index 56a4819..0000000 --- a/board/mx1fs2/lowlevel_init.S +++ /dev/null @@ -1,188 +0,0 @@ -/* - * Copyright (C) 2004 Sascha Hauer, Pengutronix - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA - * 02111-1307, USA. - * - */ - -#include <config.h> -#include <version.h> -#include <asm/arch/imx-regs.h> - -.globl lowlevel_init -lowlevel_init: - - mov r10, lr - -/* Change PERCLK1DIV to 14 ie 14+1 */ - ldr r0, =PCDR - ldr r1, =CONFIG_SYS_PCDR_VAL - str r1, [r0] - -/* set MCU PLL Control Register 0 */ - - ldr r0, =MPCTL0 - ldr r1, =CONFIG_SYS_MPCTL0_VAL - str r1, [r0] - -/* set MCU PLL Control Register 1 */ - - ldr r0, =MPCTL1 - ldr r1, =CONFIG_SYS_MPCTL1_VAL - str r1, [r0] - -/* set mpll restart bit */ - ldr r0, =CSCR - ldr r1, [r0] - orr r1,r1,#(1<<21) - str r1, [r0] - - mov r2,#0x10 -1: - mov r3,#0x2000 -2: - subs r3,r3,#1 - bne 2b - - subs r2,r2,#1 - bne 1b - -/* set System PLL Control Register 0 */ - - ldr r0, =SPCTL0 - ldr r1, =CONFIG_SYS_SPCTL0_VAL - str r1, [r0] - -/* set System PLL Control Register 1 */ - - ldr r0, =SPCTL1 - ldr r1, =CONFIG_SYS_SPCTL1_VAL - str r1, [r0] - -/* set spll restart bit */ - ldr r0, =CSCR - ldr r1, [r0] - orr r1,r1,#(1<<22) - str r1, [r0] - - mov r2,#0x10 -1: - mov r3,#0x2000 -2: - subs r3,r3,#1 - bne 2b - - subs r2,r2,#1 - bne 1b - - ldr r0, =CSCR - ldr r1, =CONFIG_SYS_CSCR_VAL - str r1, [r0] - - ldr r0, =GPCR - ldr r1, =CONFIG_SYS_GPCR_VAL - str r1, [r0] - -/* - * I have now read the ARM920 DataSheet back-to-Back, and have stumbled upon - * this..... - * - * It would appear that from a Cold-Boot the ARM920T enters "FastBus" mode CP15 - * register 1, this stops it using the output of the PLL and thus runs at the - * slow rate. Unless you place the Core into "Asynch" mode, the CPU will never - * use the value set in the CM_OSC registers...regardless of what you set it - * too! Thus, although i thought i was running at 140MHz, i'm actually running - * at 40!.. - * - * Slapping this into my bootloader does the trick... - * - * MRC p15,0,r0,c1,c0,0 ; read core configuration register - * ORR r0,r0,#0xC0000000 ; set asynchronous clocks and not fastbus mode - * MCR p15,0,r0,c1,c0,0 ; write modified value to core configuration - * register - * - */ - MRC p15,0,r0,c1,c0,0 -/* ORR r0,r0,#0xC0000000 async mode */ -/* ORR r0,r0,#0x40000000 sync mode */ - ORR r0,r0,#0xC0000000 - MCR p15,0,r0,c1,c0,0 - - ldr r0, =GIUS(0) - ldr r1, =CONFIG_SYS_GIUS_A_VAL - str r1, [r0] - - ldr r0, =FMCR - ldr r1, =CONFIG_SYS_FMCR_VAL - str r1, [r0] - - ldr r0, =CS0U - ldr r1, =CONFIG_SYS_CS0U_VAL - str r1, [r0] - - ldr r0, =CS0L - ldr r1, =CONFIG_SYS_CS0L_VAL - str r1, [r0] - - ldr r0, =CS1U - ldr r1, =CONFIG_SYS_CS1U_VAL - str r1, [r0] - - ldr r0, =CS1L - ldr r1, =CONFIG_SYS_CS1L_VAL - str r1, [r0] - - ldr r0, =CS4U - ldr r1, =CONFIG_SYS_CS4U_VAL - str r1, [r0] - - ldr r0, =CS4L - ldr r1, =CONFIG_SYS_CS4L_VAL - str r1, [r0] - - ldr r0, =CS5U - ldr r1, =CONFIG_SYS_CS5U_VAL - str r1, [r0] - - ldr r0, =CS5L - ldr r1, =CONFIG_SYS_CS5L_VAL - str r1, [r0] - -/* SDRAM Setup */ - - ldr r1,=0x00221000 /* adr of SDCTRL0 */ - ldr r0,=0x92120200 - str r0,[r1,#0] /* put in precharge command mode */ - ldr r2,=0x08200000 /* adr for precharge cmd */ - ldr r0,[r2,#0] /* precharge */ - ldr r0,=0xA2120200 - ldr r2,=0x08000000 /* start of SDRAM */ - str r0,[r1,#0] /* put in auto-refresh mode */ - ldr r0,[r2,#0] /* auto-refresh */ - ldr r0,[r2,#0] /* auto-refresh */ - ldr r0,[r2,#0] /* auto-refresh */ - ldr r0,[r2,#0] /* auto-refresh */ - ldr r0,[r2,#0] /* auto-refresh */ - ldr r0,[r2,#0] /* auto-refresh */ - ldr r0,[r2,#0] /* auto-refresh */ - ldr r0,=0xB2120200 - ldr r2,=0x08111800 - str r0,[r1,#0] /* setup for mode register of SDRAM */ - ldr r0,[r2,#0] /* program mode register */ - ldr r0,=0x82124267 - str r0,[r1,#0] /* back to normal operation */ - - mov pc,r10 |