mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-02 17:41:08 +00:00
3a574cbe72
add support for the KS8695P (ARM 922 based) CPU * Patch by Steven Scholz, 19 May 2005: Add support for CONFIG_SERIAL_TAG on ARM boards
205 lines
5.8 KiB
ArmAsm
205 lines
5.8 KiB
ArmAsm
/*
|
|
* lowlevel_init.S - basic hardware initialization for the KS8695 CPU
|
|
*
|
|
* Copyright (c) 2004-2005, Greg Ungerer <greg.ungerer@opengear.com>
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* 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/platform.h>
|
|
|
|
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
|
|
|
|
/*
|
|
*************************************************************************
|
|
*
|
|
* Handy dandy macros
|
|
*
|
|
*************************************************************************
|
|
*/
|
|
|
|
/* Delay a bit */
|
|
.macro DELAY_FOR cycles, reg0
|
|
ldr \reg0, =\cycles
|
|
subs \reg0, \reg0, #1
|
|
subne pc, pc, #0xc
|
|
.endm
|
|
|
|
/*
|
|
*************************************************************************
|
|
*
|
|
* Some local storage.
|
|
*
|
|
*************************************************************************
|
|
*/
|
|
|
|
/* Should we boot with an interactive console or not */
|
|
.globl serial_console
|
|
|
|
/*
|
|
*************************************************************************
|
|
*
|
|
* Raw hardware initialization code. The important thing is to get
|
|
* SDRAM setup and running. We do some other basic things here too,
|
|
* like getting the PLL set for high speed, and init the LEDs.
|
|
*
|
|
*************************************************************************
|
|
*/
|
|
|
|
.globl lowlevel_init
|
|
lowlevel_init:
|
|
|
|
#if DEBUG
|
|
/*
|
|
* enable UART for early debug trace
|
|
*/
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_UART_DIVISOR)
|
|
mov r2, #0xd9
|
|
str r2, [r1] /* 115200 baud */
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_UART_LINE_CTRL)
|
|
mov r2, #0x03
|
|
str r2, [r1] /* 8 data bits, no parity, 1 stop */
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_UART_TX_HOLDING)
|
|
mov r2, #0x41
|
|
str r2, [r1] /* write 'A' */
|
|
#endif
|
|
#if DEBUG
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_UART_TX_HOLDING)
|
|
mov r2, #0x42
|
|
str r2, [r1]
|
|
#endif
|
|
|
|
/*
|
|
* remap the memory and flash regions. we want to end up with
|
|
* ram from address 0, and flash at 32MB.
|
|
*/
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_MEM_CTRL0)
|
|
ldr r2, =0xbfc00040
|
|
str r2, [r1] /* large flash map */
|
|
ldr pc, =(highflash+0x02000000-0x00f00000) /* jump to high flash address */
|
|
highflash:
|
|
ldr r2, =0x8fe00040
|
|
str r2, [r1] /* remap flash range */
|
|
|
|
/*
|
|
* remap the second select region to the 4MB immediately after
|
|
* the first region. This way if you have a larger flash (say 8Mb)
|
|
* then you can have it all mapped nicely. Has no effect if you
|
|
* only have a 4Mb or smaller flash.
|
|
*/
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_MEM_CTRL1)
|
|
ldr r2, =0x9fe40040
|
|
str r2, [r1] /* remap flash2 region, contiguous */
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_MEM_GENERAL)
|
|
ldr r2, =0x30000005
|
|
str r2, [r1] /* enable both flash selects */
|
|
|
|
#ifdef CONFIG_CM41xx
|
|
/*
|
|
* map the second flash chip, using the external IO lines.
|
|
*/
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_IO_CTRL0)
|
|
ldr r2, =0xafe80b6d
|
|
str r2, [r1] /* remap io0 region, contiguous */
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_IO_CTRL1)
|
|
ldr r2, =0xbfec0b6d
|
|
str r2, [r1] /* remap io1 region, contiguous */
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_MEM_GENERAL)
|
|
ldr r2, =0x30050005
|
|
str r2, [r1] /* enable second flash */
|
|
#endif
|
|
|
|
/*
|
|
* before relocating, we have to setup RAM timing
|
|
*/
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_SDRAM_CTRL0)
|
|
#if (PHYS_SDRAM_1_SIZE == 0x02000000)
|
|
ldr r2, =0x7fc0000e /* 32MB */
|
|
#else
|
|
ldr r2, =0x3fc0000e /* 16MB */
|
|
#endif
|
|
str r2, [r1] /* configure sdram bank0 setup */
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_SDRAM_CTRL1)
|
|
mov r2, #0
|
|
str r2, [r1] /* configure sdram bank1 setup */
|
|
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_SDRAM_GENERAL)
|
|
ldr r2, =0x0000000a
|
|
str r2, [r1] /* set RAS/CAS timing */
|
|
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_SDRAM_BUFFER)
|
|
ldr r2, =0x00030000
|
|
str r2, [r1] /* send NOP command */
|
|
DELAY_FOR 0x100, r0
|
|
ldr r2, =0x00010000
|
|
str r2, [r1] /* send PRECHARGE-ALL */
|
|
DELAY_FOR 0x100, r0
|
|
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_SDRAM_REFRESH)
|
|
ldr r2, =0x00000020
|
|
str r2, [r1] /* set for fast refresh */
|
|
DELAY_FOR 0x100, r0
|
|
ldr r2, =0x00000190
|
|
str r2, [r1] /* set normal refresh timing */
|
|
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_SDRAM_BUFFER)
|
|
ldr r2, =0x00020033
|
|
str r2, [r1] /* send mode command */
|
|
DELAY_FOR 0x100, r0
|
|
ldr r2, =0x01f00000
|
|
str r2, [r1] /* enable sdram fifos */
|
|
|
|
/*
|
|
* set pll to top speed
|
|
*/
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_SYSTEN_BUS_CLOCK)
|
|
mov r2, #0
|
|
str r2, [r1] /* set pll clock to 166MHz */
|
|
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_SWITCH_CTRL0)
|
|
ldr r2, [r1] /* Get switch ctrl0 register */
|
|
and r2, r2, #0x0fc00000 /* Mask out LED control bits */
|
|
orr r2, r2, #0x01800000 /* Set Link/activity/speed actions */
|
|
str r2, [r1]
|
|
|
|
#ifdef CONFIG_CM4008
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_GPIO_MODE)
|
|
ldr r2, =0x0000fe30
|
|
str r2, [r1] /* enable LED's as outputs */
|
|
ldr r1, =(KS8695_IO_BASE+KS8695_GPIO_DATA)
|
|
ldr r2, =0x0000fe20
|
|
str r2, [r1] /* turn on power LED */
|
|
#endif
|
|
#if defined(CONFIG_CM4008) || defined(CONFIG_CM41xx)
|
|
ldr r2, [r1] /* get current GPIO input data */
|
|
tst r2, #0x8 /* check if "erase" depressed */
|
|
beq nobutton
|
|
mov r2, #0 /* be quiet on boot, no console */
|
|
ldr r1, =serial_console
|
|
str r2, [r1]
|
|
nobutton:
|
|
#endif
|
|
|
|
add lr, lr, #0x02000000 /* flash is now mapped high */
|
|
add ip, ip, #0x02000000 /* this is a hack */
|
|
mov pc, lr /* all done, return */
|
|
|
|
#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
|