Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  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 <asm/pgtable.h>

#include <asm/page.h>

#include <asm/irq.h>

#include <asm/io.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"

extern void __init isa_init_irq(unsigned int irq);

unsigned int mem_fclk_21285 = 50000000;

EXPORT_SYMBOL(mem_fclk_21285);

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

};

/*

 * The CO-ebsa285 mapping.

 */

static struct map_desc co285_io_desc[] __initdata = {

#ifdef CONFIG_ARCH_CO285

        {

                .virtual        = PCIO_BASE,

                .pfn            = __phys_to_pfn(DC21285_PCI_IO),

                .length         = PCIO_SIZE,

                .type           = MT_DEVICE,

        }, {

                .virtual        = PCIMEM_BASE,

                .pfn            = __phys_to_pfn(DC21285_PCI_MEM),

                .length         = PCIMEM_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 (machine_is_co285())

                iotable_init(co285_io_desc, ARRAY_SIZE(co285_io_desc));

        if (footbridge_cfn_mode())

                iotable_init(ebsa285_host_io_desc, ARRAY_SIZE(ebsa285_host_io_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_zeroed_page or kmalloc.

 */

unsigned long __virt_to_bus(unsigned long res)

{

        WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);

        return (res - PAGE_OFFSET) + (*CSR_PCISDRAMBASE & 0xfffffff0);

}

EXPORT_SYMBOL(__virt_to_bus);

unsigned long __bus_to_virt(unsigned long res)

{

        res -= (*CSR_PCISDRAMBASE & 0xfffffff0);

        res += PAGE_OFFSET;

        WARN_ON(res < PAGE_OFFSET || res >= (unsigned long)high_memory);

        return res;

}

EXPORT_SYMBOL(__bus_to_virt);

#endif