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ixdp2400.c

/*
 * arch/arm/mach-ixp2000/ixdp2400.c
 *
 * IXDP2400 platform support
 *
 * Original Author: Naeem Afzal <naeem.m.afzal@intel.com>
 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
 *
 * Copyright (C) 2002 Intel Corp.
 * Copyright (C) 2003-2004 MontaVista Software, Inc.
 *
 *  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.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/bitops.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/io.h>

#include <asm/irq.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>

#include <asm/mach/pci.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#include <asm/mach/flash.h>
#include <asm/mach/arch.h>

/*************************************************************************
 * IXDP2400 timer tick
 *************************************************************************/
static void __init ixdp2400_timer_init(void)
{
      int numerator, denominator;
      int denom_array[] = {2, 4, 8, 16, 1, 2, 4, 8};

      numerator = (*(IXDP2400_CPLD_SYS_CLK_M) & 0xFF) *2;
      denominator = denom_array[(*(IXDP2400_CPLD_SYS_CLK_N) & 0x7)];

      ixp2000_init_time(((3125000 * numerator) / (denominator)) / 2);
}

static struct sys_timer ixdp2400_timer = {
      .init       = ixdp2400_timer_init,
      .offset           = ixp2000_gettimeoffset,
};

/*************************************************************************
 * IXDP2400 PCI
 *************************************************************************/
void __init ixdp2400_pci_preinit(void)
{
      ixp2000_reg_write(IXP2000_PCI_ADDR_EXT, 0x00100000);
      ixp2000_pci_preinit();
      pcibios_setup("firmware");
}

int ixdp2400_pci_setup(int nr, struct pci_sys_data *sys)
{
      sys->mem_offset = 0xe0000000;

      ixp2000_pci_setup(nr, sys);

      return 1;
}

static int __init ixdp2400_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
      if (ixdp2x00_master_npu()) {

            /*
             * Root bus devices.  Slave NPU is only one with interrupt.
             * Everything else, we just return -1 b/c nothing else
             * on the root bus has interrupts.
             */
            if(!dev->bus->self) {
                  if(dev->devfn == IXDP2X00_SLAVE_NPU_DEVFN )
                        return IRQ_IXDP2400_INGRESS_NPU;

                  return -1;
            }

            /*
             * Bridge behind the PMC slot.
             * NOTE: Only INTA from the PMC slot is routed. VERY BAD.
             */
            if(dev->bus->self->devfn == IXDP2X00_PMC_DEVFN &&
                  dev->bus->parent->self->devfn == IXDP2X00_P2P_DEVFN &&
                  !dev->bus->parent->self->bus->parent)
                          return IRQ_IXDP2400_PMC;

            /*
             * Device behind the first bridge
             */
            if(dev->bus->self->devfn == IXDP2X00_P2P_DEVFN) {
                  switch(dev->devfn) {
                        case IXDP2400_MASTER_ENET_DEVFN:    
                              return IRQ_IXDP2400_ENET;     
                  
                        case IXDP2400_MEDIA_DEVFN:
                              return IRQ_IXDP2400_MEDIA_PCI;

                        case IXDP2400_SWITCH_FABRIC_DEVFN:
                              return IRQ_IXDP2400_SF_PCI;

                        case IXDP2X00_PMC_DEVFN:
                              return IRQ_IXDP2400_PMC;
                  }
            }

            return -1;
      } else return IRQ_IXP2000_PCIB; /* Slave NIC interrupt */
}


static void ixdp2400_pci_postinit(void)
{
      struct pci_dev *dev;

      if (ixdp2x00_master_npu()) {
            dev = pci_get_bus_and_slot(1, IXDP2400_SLAVE_ENET_DEVFN);
            pci_remove_bus_device(dev);
            pci_dev_put(dev);
      } else {
            dev = pci_get_bus_and_slot(1, IXDP2400_MASTER_ENET_DEVFN);
            pci_remove_bus_device(dev);
            pci_dev_put(dev);

            ixdp2x00_slave_pci_postinit();
      }
}

static struct hw_pci ixdp2400_pci __initdata = {
      .nr_controllers   = 1,
      .setup            = ixdp2400_pci_setup,
      .preinit    = ixdp2400_pci_preinit,
      .postinit   = ixdp2400_pci_postinit,
      .scan       = ixp2000_pci_scan_bus,
      .map_irq    = ixdp2400_pci_map_irq,
};

int __init ixdp2400_pci_init(void)
{
      if (machine_is_ixdp2400())
            pci_common_init(&ixdp2400_pci);

      return 0;
}

subsys_initcall(ixdp2400_pci_init);

void __init ixdp2400_init_irq(void)
{
      ixdp2x00_init_irq(IXDP2400_CPLD_INT_STAT, IXDP2400_CPLD_INT_MASK, IXDP2400_NR_IRQS);
}

MACHINE_START(IXDP2400, "Intel IXDP2400 Development Platform")
      /* Maintainer: MontaVista Software, Inc. */
      .phys_io    = IXP2000_UART_PHYS_BASE,
      .io_pg_offst      = ((IXP2000_UART_VIRT_BASE) >> 18) & 0xfffc,
      .boot_params      = 0x00000100,
      .map_io           = ixdp2x00_map_io,
      .init_irq   = ixdp2400_init_irq,
      .timer            = &ixdp2400_timer,
      .init_machine     = ixdp2x00_init_machine,
MACHINE_END


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