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common.c

/*
 *  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

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