提交 eea643f7 编写于 作者: J Juergen Beisert 提交者: Robert Schwebel

i.MX2 family: Add basic mach support (sources)

This patch adds basic mach support for the mx2 processor family, based
on the original freescale code and adapted to mainline kernel coding
style.
Signed-off-by: NJuergen Beisert <j.beisert@pengutronix.de>
上级 aa10abd3
comment "MX2 family CPU support"
depends on ARCH_MX2
comment "MX2 Platforms"
depends on ARCH_MX2
#
# Makefile for the linux kernel.
#
# Object file lists.
obj-y := system.o generic.o
zreladdr-y := 0xA0008000
params_phys-y := 0xA0000100
initrd_phys-y := 0xA0800000
/*
* generic.c
*
* Copyright (C) 2008 Juergen Beisert (kernel@pengutronix.de)
*
* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <linux/mm.h>
#include <linux/init.h>
#include <asm/hardware.h>
#include <asm/pgtable.h>
#include <asm/mach/map.h>
/* MX27 memory map definition */
static struct map_desc mxc_io_desc[] __initdata = {
/*
* this fixed mapping covers:
* - AIPI1
* - AIPI2
* - AITC
* - ROM Patch
* - and some reserved space
*/
{
.virtual = AIPI_BASE_ADDR_VIRT,
.pfn = __phys_to_pfn(AIPI_BASE_ADDR),
.length = AIPI_SIZE,
.type = MT_DEVICE
},
/*
* this fixed mapping covers:
* - CSI
* - ATA
*/
{
.virtual = SAHB1_BASE_ADDR_VIRT,
.pfn = __phys_to_pfn(SAHB1_BASE_ADDR),
.length = SAHB1_SIZE,
.type = MT_DEVICE
},
/*
* this fixed mapping covers:
* - EMI
*/
{
.virtual = X_MEMC_BASE_ADDR_VIRT,
.pfn = __phys_to_pfn(X_MEMC_BASE_ADDR),
.length = X_MEMC_SIZE,
.type = MT_DEVICE
}
};
/*
* Initialize the memory map. It is called during the
* system startup to create static physical to virtual
* memory map for the IO modules.
*/
void __init mxc_map_io(void)
{
iotable_init(mxc_io_desc, ARRAY_SIZE(mxc_io_desc));
}
/*
* Copyright (C) 1999 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd
* Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
*
* 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 <linux/kernel.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <asm/arch/hardware.h>
#include <asm/proc-fns.h>
#include <asm/system.h>
/*
* Put the CPU into idle mode. It is called by default_idle()
* in process.c file.
*/
void arch_idle(void)
{
/*
* This should do all the clock switching
* and wait for interrupt tricks.
*/
cpu_do_idle();
}
#define WDOG_WCR_REG IO_ADDRESS(WDOG_BASE_ADDR)
#define WDOG_WCR_SRS (1 << 4)
/*
* Reset the system. It is called by machine_restart().
*/
void arch_reset(char mode)
{
struct clk *clk;
clk = clk_get(NULL, "wdog_clk");
if (!clk) {
printk(KERN_ERR"Cannot activate the watchdog. Giving up\n");
return;
}
clk_enable(clk);
/* Assert SRS signal */
__raw_writew(__raw_readw(WDOG_WCR_REG) & ~WDOG_WCR_SRS, WDOG_WCR_REG);
}
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