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/*
* linux/arch/arm/mm/mm-footbridge.c
*
* Copyright (C) 1998-2000 Russell King, Dave Gilbert.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Extra MM routines for the EBSA285 architecture
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/io.h>
#include <asm/hardware/dec21285.h>
#include <asm/mach-types.h>
#include <asm/mach/map.h>
/*
* Common mapping for all systems. Note that the outbound write flush is
* commented out since there is a "No Fix" problem with it. Not mapping
* it means that we have extra bullet protection on our feet.
*/
static struct map_desc fb_common_io_desc[] __initdata = {
{ ARMCSR_BASE, DC21285_ARMCSR_BASE, ARMCSR_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
{ XBUS_BASE, 0x40000000, XBUS_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
LAST_DESC
};
/*
* The mapping when the footbridge is in host mode. We don't map any of
* this when we are in add-in mode.
*/
static struct map_desc ebsa285_host_io_desc[] __initdata = {
#if defined(CONFIG_ARCH_FOOTBRIDGE) && defined(CONFIG_FOOTBRIDGE_HOST)
{ PCIMEM_BASE, DC21285_PCI_MEM, PCIMEM_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
{ PCICFG0_BASE, DC21285_PCI_TYPE_0_CONFIG, PCICFG0_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
{ PCICFG1_BASE, DC21285_PCI_TYPE_1_CONFIG, PCICFG1_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
{ PCIIACK_BASE, DC21285_PCI_IACK, PCIIACK_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
{ PCIO_BASE, DC21285_PCI_IO, PCIO_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
#endif
LAST_DESC
};
/*
* The CO-ebsa285 mapping.
*/
static struct map_desc co285_io_desc[] __initdata = {
#ifdef CONFIG_ARCH_CO285
{ PCIO_BASE, DC21285_PCI_IO, PCIO_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
{ PCIMEM_BASE, DC21285_PCI_MEM, PCIMEM_SIZE, DOMAIN_IO, 0, 1, 0, 0 },
#endif
LAST_DESC
};
void __init footbridge_map_io(void)
{
struct map_desc *desc = NULL;
/*
* Set up the common mapping first; we need this to
* determine whether we're in host mode or not.
*/
iotable_init(fb_common_io_desc);
/*
* Now, work out what we've got to map in addition on this
* platform.
*/
if (machine_is_co285())
desc = co285_io_desc;
else if (footbridge_cfn_mode())
desc = ebsa285_host_io_desc;
if (desc)
iotable_init(desc);
}
#ifdef CONFIG_FOOTBRIDGE_ADDIN
/*
* These two functions convert virtual addresses to PCI addresses and PCI
* addresses to virtual addresses. Note that it is only legal to use these
* on memory obtained via get_free_page or kmalloc.
*/
unsigned long __virt_to_bus(unsigned long res)
{
#ifdef CONFIG_DEBUG_ERRORS
if (res < PAGE_OFFSET || res >= (unsigned long)high_memory) {
printk("__virt_to_bus: invalid virtual address 0x%08lx\n", res);
__backtrace();
}
#endif
return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);
}
unsigned long __bus_to_virt(unsigned long res)
{
res -= (*CSR_PCISDRAMBASE & 0xfffffff0);
res += PAGE_OFFSET;
#ifdef CONFIG_DEBUG_ERRORS
if (res < PAGE_OFFSET || res >= (unsigned long)high_memory) {
printk("__bus_to_virt: invalid virtual address 0x%08lx\n", res);
__backtrace();
}
#endif
return res;
}
#endif
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