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/*
* linux/arch/arm/mach-footbridge/common.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.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/list.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/setup.h>
#include <asm/hardware/dec21285.h>
#include <asm/mach/irq.h>
#include <asm/mach/map.h>
#include "common.h"
unsigned int mem_fclk_21285 = 50000000;
EXPORT_SYMBOL(mem_fclk_21285);
static int __init early_fclk(char *arg)
{
mem_fclk_21285 = simple_strtoul(arg, NULL, 0);
return 0;
}
early_param("mem_fclk_21285", early_fclk);
static int __init parse_tag_memclk(const struct tag *tag)
{
mem_fclk_21285 = tag->u.memclk.fmemclk;
return 0;
}
__tagtable(ATAG_MEMCLK, parse_tag_memclk);
/*
* Footbridge IRQ translation table
* Converts from our IRQ numbers into FootBridge masks
*/
static const int fb_irq_mask[] = {
IRQ_MASK_UART_RX, /* 0 */
IRQ_MASK_UART_TX, /* 1 */
IRQ_MASK_TIMER1, /* 2 */
IRQ_MASK_TIMER2, /* 3 */
IRQ_MASK_TIMER3, /* 4 */
IRQ_MASK_IN0, /* 5 */
IRQ_MASK_IN1, /* 6 */
IRQ_MASK_IN2, /* 7 */
IRQ_MASK_IN3, /* 8 */
IRQ_MASK_DOORBELLHOST, /* 9 */
IRQ_MASK_DMA1, /* 10 */
IRQ_MASK_DMA2, /* 11 */
IRQ_MASK_PCI, /* 12 */
IRQ_MASK_SDRAMPARITY, /* 13 */
IRQ_MASK_I2OINPOST, /* 14 */
IRQ_MASK_PCI_ABORT, /* 15 */
IRQ_MASK_PCI_SERR, /* 16 */
IRQ_MASK_DISCARD_TIMER, /* 17 */
IRQ_MASK_PCI_DPERR, /* 18 */
IRQ_MASK_PCI_PERR, /* 19 */
};
static void fb_mask_irq(unsigned int irq)
{
*CSR_IRQ_DISABLE = fb_irq_mask[_DC21285_INR(irq)];
}
static void fb_unmask_irq(unsigned int irq)
{
*CSR_IRQ_ENABLE = fb_irq_mask[_DC21285_INR(irq)];
}
static struct irq_chip fb_chip = {
.ack = fb_mask_irq,
.mask = fb_mask_irq,
.unmask = fb_unmask_irq,
};
static void __init __fb_init_irq(void)
{
unsigned int irq;
/*
* setup DC21285 IRQs
*/
*CSR_IRQ_DISABLE = -1;
*CSR_FIQ_DISABLE = -1;
for (irq = _DC21285_IRQ(0); irq < _DC21285_IRQ(20); irq++) {
set_irq_chip(irq, &fb_chip);
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
}
}
void __init footbridge_init_irq(void)
{
__fb_init_irq();
if (!footbridge_cfn_mode())
return;
if (machine_is_ebsa285())
/* The following is dependent on which slot
* you plug the Southbridge card into. We
* currently assume that you plug it into
* the right-hand most slot.
*/
isa_init_irq(IRQ_PCI);
if (machine_is_cats())
isa_init_irq(IRQ_IN2);
if (machine_is_netwinder())
isa_init_irq(IRQ_IN3);
}
/*
* 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 = {
{
.virtual = ARMCSR_BASE,
.pfn = __phys_to_pfn(DC21285_ARMCSR_BASE),
.length = ARMCSR_SIZE,
.type = MT_DEVICE,
}, {
.virtual = XBUS_BASE,
.pfn = __phys_to_pfn(0x40000000),
.length = XBUS_SIZE,
.type = MT_DEVICE,
}
};
/*
* 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)
{
.virtual = PCIMEM_BASE,
.pfn = __phys_to_pfn(DC21285_PCI_MEM),
.length = PCIMEM_SIZE,
.type = MT_DEVICE,
}, {
.virtual = PCICFG0_BASE,
.pfn = __phys_to_pfn(DC21285_PCI_TYPE_0_CONFIG),
.length = PCICFG0_SIZE,
.type = MT_DEVICE,
}, {
.virtual = PCICFG1_BASE,
.pfn = __phys_to_pfn(DC21285_PCI_TYPE_1_CONFIG),
.length = PCICFG1_SIZE,
.type = MT_DEVICE,
}, {
.virtual = PCIIACK_BASE,
.pfn = __phys_to_pfn(DC21285_PCI_IACK),
.length = PCIIACK_SIZE,
.type = MT_DEVICE,
}, {
.virtual = PCIO_BASE,
.pfn = __phys_to_pfn(DC21285_PCI_IO),
.length = PCIO_SIZE,
.type = MT_DEVICE,
},
#endif
};
void __init footbridge_map_io(void)
{
/*
* 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, ARRAY_SIZE(fb_common_io_desc));
/*
* Now, work out what we've got to map in addition on this
* platform.
*/
if (footbridge_cfn_mode())
iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_desc));
}
#ifdef CONFIG_FOOTBRIDGE_ADDIN
static inline unsigned long fb_bus_sdram_offset(void)
{
return *CSR_PCISDRAMBASE & 0xfffffff0;
}
/*
* 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_zeroed_page or kmalloc.
*/
unsigned long __virt_to_bus(unsigned long res)
{
WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
return res + (fb_bus_sdram_offset() - PAGE_OFFSET);
}
EXPORT_SYMBOL(__virt_to_bus);
unsigned long __bus_to_virt(unsigned long res)
{
res = res - (fb_bus_sdram_offset() - PAGE_OFFSET);
WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);
return res;
}
EXPORT_SYMBOL(__bus_to_virt);
unsigned long __pfn_to_bus(unsigned long pfn)
{
return __pfn_to_phys(pfn) + (fb_bus_sdram_offset() - PHYS_OFFSET);
}
EXPORT_SYMBOL(__pfn_to_bus);
unsigned long __bus_to_pfn(unsigned long bus)
{
return __phys_to_pfn(bus - (fb_bus_sdram_offset() - PHYS_OFFSET));
}
EXPORT_SYMBOL(__bus_to_pfn);
#endif
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