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   1 /*
   2  * arch/arm/mach-ixp2000/ixdp2400.c
   3  *
   4  * IXDP2400 platform support
   5  *
   6  * Original Author: Naeem Afzal <naeem.m.afzal@intel.com>
   7  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
   8  *
   9  * Copyright (C) 2002 Intel Corp.
  10  * Copyright (C) 2003-2004 MontaVista Software, Inc.
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  */
  17 #include <linux/config.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/mm.h>
  21 #include <linux/sched.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/device.h>
  24 #include <linux/bitops.h>
  25 #include <linux/pci.h>
  26 #include <linux/ioport.h>
  27 #include <linux/slab.h>
  28 #include <linux/delay.h>
  29
  30 #include <asm/io.h>
  31 #include <asm/irq.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/page.h>
  34 #include <asm/system.h>
  35 #include <asm/hardware.h>
  36 #include <asm/mach-types.h>
  37
  38 #include <asm/mach/pci.h>
  39 #include <asm/mach/map.h>
  40 #include <asm/mach/irq.h>
  41 #include <asm/mach/time.h>
  42 #include <asm/mach/flash.h>
  43 #include <asm/mach/arch.h>
  44
  45 /*************************************************************************
  46  * IXDP2400 timer tick
  47  *************************************************************************/
  48 static void __init ixdp2400_timer_init(void)
  49 {
  50         int numerator, denominator;
  51         int denom_array[] = {2, 4, 8, 16, 1, 2, 4, 8};
  52
  53         numerator = (*(IXDP2400_CPLD_SYS_CLK_M) & 0xFF) *2;
  54         denominator = denom_array[(*(IXDP2400_CPLD_SYS_CLK_N) & 0x7)];
  55
  56         ixp2000_init_time(((3125000 * numerator) / (denominator)) / 2);
  57 }
  58
  59 static struct sys_timer ixdp2400_timer = {
  60         .init           = ixdp2400_timer_init,
  61         .offset         = ixp2000_gettimeoffset,
  62 };
  63
  64 /*************************************************************************
  65  * IXDP2400 PCI
  66  *************************************************************************/
  67 void __init ixdp2400_pci_preinit(void)
  68 {
  69         ixp2000_reg_write(IXP2000_PCI_ADDR_EXT, 0x00100000);
  70         ixp2000_pci_preinit();
  71 }
  72
  73 int ixdp2400_pci_setup(int nr, struct pci_sys_data *sys)
  74 {
  75         sys->mem_offset = 0xe0000000;
  76
  77         ixp2000_pci_setup(nr, sys);
  78
  79         return 1;
  80 }
  81
  82 static int __init ixdp2400_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  83 {
  84         if (ixdp2x00_master_npu()) {
  85
  86                 /*
  87                  * Root bus devices.  Slave NPU is only one with interrupt.
  88                  * Everything else, we just return -1 b/c nothing else
  89                  * on the root bus has interrupts.
  90                  */
  91                 if(!dev->bus->self) {
  92                         if(dev->devfn == IXDP2X00_SLAVE_NPU_DEVFN )
  93                                 return IRQ_IXDP2400_INGRESS_NPU;
  94
  95                         return -1;
  96                 }
  97
  98                 /*
  99                  * Bridge behind the PMC slot.
 100                  * NOTE: Only INTA from the PMC slot is routed. VERY BAD.
 101                  */
 102                 if(dev->bus->self->devfn == IXDP2X00_PMC_DEVFN &&
 103                         dev->bus->parent->self->devfn == IXDP2X00_P2P_DEVFN &&
 104                         !dev->bus->parent->self->bus->parent)
 105                                   return IRQ_IXDP2400_PMC;
 106
 107                 /*
 108                  * Device behind the first bridge
 109                  */
 110                 if(dev->bus->self->devfn == IXDP2X00_P2P_DEVFN) {
 111                         switch(dev->devfn) {
 112                                 case IXDP2400_MASTER_ENET_DEVFN:
 113                                         return IRQ_IXDP2400_ENET;
 114
 115                                 case IXDP2400_MEDIA_DEVFN:
 116                                         return IRQ_IXDP2400_MEDIA_PCI;
 117
 118                                 case IXDP2400_SWITCH_FABRIC_DEVFN:
 119                                         return IRQ_IXDP2400_SF_PCI;
 120
 121                                 case IXDP2X00_PMC_DEVFN:
 122                                         return IRQ_IXDP2400_PMC;
 123                         }
 124                 }
 125
 126                 return -1;
 127         } else return IRQ_IXP2000_PCIB; /* Slave NIC interrupt */
 128 }
 129
 130
 131 static void ixdp2400_pci_postinit(void)
 132 {
 133         struct pci_dev *dev;
 134
 135         if (ixdp2x00_master_npu()) {
 136                 dev = pci_find_slot(1, IXDP2400_SLAVE_ENET_DEVFN);
 137                 pci_remove_bus_device(dev);
 138         } else {
 139                 dev = pci_find_slot(1, IXDP2400_MASTER_ENET_DEVFN);
 140                 pci_remove_bus_device(dev);
 141
 142                 ixdp2x00_slave_pci_postinit();
 143         }
 144 }
 145
 146 static struct hw_pci ixdp2400_pci __initdata = {
 147         .nr_controllers = 1,
 148         .setup          = ixdp2400_pci_setup,
 149         .preinit        = ixdp2400_pci_preinit,
 150         .postinit       = ixdp2400_pci_postinit,
 151         .scan           = ixp2000_pci_scan_bus,
 152         .map_irq        = ixdp2400_pci_map_irq,
 153 };
 154
 155 int __init ixdp2400_pci_init(void)
 156 {
 157         if (machine_is_ixdp2400())
 158                 pci_common_init(&ixdp2400_pci);
 159
 160         return 0;
 161 }
 162
 163 subsys_initcall(ixdp2400_pci_init);
 164
 165 void ixdp2400_init_irq(void)
 166 {
 167         ixdp2x00_init_irq(IXDP2400_CPLD_INT_STAT, IXDP2400_CPLD_INT_MASK, IXDP2400_NR_IRQS);
 168 }
 169
 170 MACHINE_START(IXDP2400, "Intel IXDP2400 Development Platform")
 171         /* Maintainer: MontaVista Software, Inc. */
 172         .phys_io        = IXP2000_UART_PHYS_BASE,
 173         .io_pg_offst    = ((IXP2000_UART_VIRT_BASE) >> 18) & 0xfffc,
 174         .boot_params    = 0x00000100,
 175         .map_io         = ixdp2x00_map_io,
 176         .init_irq       = ixdp2400_init_irq,
 177         .timer          = &ixdp2400_timer,
 178         .init_machine   = ixdp2x00_init_machine,
 179 MACHINE_END
 180