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   1 /*
   2  * arch/arm/mach-ixp2000/ixdp2800.c
   3  *
   4  * IXDP2800 platform support
   5  *
   6  * Original Author: Jeffrey Daly <jeffrey.daly@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  * IXDP2800 timer tick
  47  *************************************************************************/
  48
  49 static void __init ixdp2800_timer_init(void)
  50 {
  51         ixp2000_init_time(50000000);
  52 }
  53
  54 static struct sys_timer ixdp2800_timer = {
  55         .init           = ixdp2800_timer_init,
  56         .offset         = ixp2000_gettimeoffset,
  57 };
  58
  59 /*************************************************************************
  60  * IXDP2800 PCI
  61  *************************************************************************/
  62 static void __init ixdp2800_slave_disable_pci_master(void)
  63 {
  64         *IXP2000_PCI_CMDSTAT &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
  65 }
  66
  67 static void __init ixdp2800_master_wait_for_slave(void)
  68 {
  69         volatile u32 *addr;
  70
  71         printk(KERN_INFO "IXDP2800: waiting for slave NPU to configure "
  72                          "its BAR sizes\n");
  73
  74         addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
  75                                         PCI_BASE_ADDRESS_1);
  76         do {
  77                 *addr = 0xffffffff;
  78                 cpu_relax();
  79         } while (*addr != 0xfe000008);
  80
  81         addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
  82                                         PCI_BASE_ADDRESS_2);
  83         do {
  84                 *addr = 0xffffffff;
  85                 cpu_relax();
  86         } while (*addr != 0xc0000008);
  87
  88         /*
  89          * Configure the slave's SDRAM BAR by hand.
  90          */
  91         *addr = 0x40000008;
  92 }
  93
  94 static void __init ixdp2800_slave_wait_for_master_enable(void)
  95 {
  96         printk(KERN_INFO "IXDP2800: waiting for master NPU to enable us\n");
  97
  98         while ((*IXP2000_PCI_CMDSTAT & PCI_COMMAND_MASTER) == 0)
  99                 cpu_relax();
 100 }
 101
 102 void __init ixdp2800_pci_preinit(void)
 103 {
 104         printk("ixdp2x00_pci_preinit called\n");
 105
 106         *IXP2000_PCI_ADDR_EXT = 0x0001e000;
 107
 108         if (!ixdp2x00_master_npu())
 109                 ixdp2800_slave_disable_pci_master();
 110
 111         *IXP2000_PCI_SRAM_BASE_ADDR_MASK = (0x2000000 - 1) & ~0x3ffff;
 112         *IXP2000_PCI_DRAM_BASE_ADDR_MASK = (0x40000000 - 1) & ~0xfffff;
 113
 114         ixp2000_pci_preinit();
 115
 116         if (ixdp2x00_master_npu()) {
 117                 /*
 118                  * Wait until the slave set its SRAM/SDRAM BAR sizes
 119                  * correctly before we proceed to scan and enumerate
 120                  * the bus.
 121                  */
 122                 ixdp2800_master_wait_for_slave();
 123
 124                 /*
 125                  * We configure the SDRAM BARs by hand because they
 126                  * are 1G and fall outside of the regular allocated
 127                  * PCI address space.
 128                  */
 129                 *IXP2000_PCI_SDRAM_BAR = 0x00000008;
 130         } else {
 131                 /*
 132                  * Wait for the master to complete scanning the bus
 133                  * and assigning resources before we proceed to scan
 134                  * the bus ourselves.  Set pci=firmware to honor the
 135                  * master's resource assignment.
 136                  */
 137                 ixdp2800_slave_wait_for_master_enable();
 138                 pcibios_setup("firmware");
 139         }
 140 }
 141
 142 /*
 143  * We assign the SDRAM BARs for the two IXP2800 CPUs by hand, outside
 144  * of the regular PCI window, because there's only 512M of outbound PCI
 145  * memory window on each IXP, while we need 1G for each of the BARs.
 146  */
 147 static void __devinit ixp2800_pci_fixup(struct pci_dev *dev)
 148 {
 149         if (machine_is_ixdp2800()) {
 150                 dev->resource[2].start = 0;
 151                 dev->resource[2].end   = 0;
 152                 dev->resource[2].flags = 0;
 153         }
 154 }
 155 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP2800, ixp2800_pci_fixup);
 156
 157 static int __init ixdp2800_pci_setup(int nr, struct pci_sys_data *sys)
 158 {
 159         sys->mem_offset = 0x00000000;
 160
 161         ixp2000_pci_setup(nr, sys);
 162
 163         return 1;
 164 }
 165
 166 static int __init ixdp2800_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 167 {
 168         if (ixdp2x00_master_npu()) {
 169
 170                 /*
 171                  * Root bus devices.  Slave NPU is only one with interrupt.
 172                  * Everything else, we just return -1 which is invalid.
 173                  */
 174                 if(!dev->bus->self) {
 175                         if(dev->devfn == IXDP2X00_SLAVE_NPU_DEVFN )
 176                                 return IRQ_IXDP2800_INGRESS_NPU;
 177
 178                         return -1;
 179                 }
 180
 181                 /*
 182                  * Bridge behind the PMC slot.
 183                  */
 184                 if(dev->bus->self->devfn == IXDP2X00_PMC_DEVFN &&
 185                         dev->bus->parent->self->devfn == IXDP2X00_P2P_DEVFN &&
 186                         !dev->bus->parent->self->bus->parent)
 187                                   return IRQ_IXDP2800_PMC;
 188
 189                 /*
 190                  * Device behind the first bridge
 191                  */
 192                 if(dev->bus->self->devfn == IXDP2X00_P2P_DEVFN) {
 193                         switch(dev->devfn) {
 194                                 case IXDP2X00_PMC_DEVFN:
 195                                         return IRQ_IXDP2800_PMC;
 196
 197                                 case IXDP2800_MASTER_ENET_DEVFN:
 198                                         return IRQ_IXDP2800_EGRESS_ENET;
 199
 200                                 case IXDP2800_SWITCH_FABRIC_DEVFN:
 201                                         return IRQ_IXDP2800_FABRIC;
 202                         }
 203                 }
 204
 205                 return -1;
 206         } else return IRQ_IXP2000_PCIB; /* Slave NIC interrupt */
 207 }
 208
 209 static void __init ixdp2800_master_enable_slave(void)
 210 {
 211         volatile u32 *addr;
 212
 213         printk(KERN_INFO "IXDP2800: enabling slave NPU\n");
 214
 215         addr = (volatile u32 *)ixp2000_pci_config_addr(0,
 216                                         IXDP2X00_SLAVE_NPU_DEVFN,
 217                                         PCI_COMMAND);
 218
 219         *addr |= PCI_COMMAND_MASTER;
 220 }
 221
 222 static void __init ixdp2800_master_wait_for_slave_bus_scan(void)
 223 {
 224         volatile u32 *addr;
 225
 226         printk(KERN_INFO "IXDP2800: waiting for slave to finish bus scan\n");
 227
 228         addr = (volatile u32 *)ixp2000_pci_config_addr(0,
 229                                         IXDP2X00_SLAVE_NPU_DEVFN,
 230                                         PCI_COMMAND);
 231         while ((*addr & PCI_COMMAND_MEMORY) == 0)
 232                 cpu_relax();
 233 }
 234
 235 static void __init ixdp2800_slave_signal_bus_scan_completion(void)
 236 {
 237         printk(KERN_INFO "IXDP2800: bus scan done, signaling master\n");
 238         *IXP2000_PCI_CMDSTAT |= PCI_COMMAND_MEMORY;
 239 }
 240
 241 static void __init ixdp2800_pci_postinit(void)
 242 {
 243         if (!ixdp2x00_master_npu()) {
 244                 ixdp2x00_slave_pci_postinit();
 245                 ixdp2800_slave_signal_bus_scan_completion();
 246         }
 247 }
 248
 249 struct __initdata hw_pci ixdp2800_pci __initdata = {
 250         .nr_controllers = 1,
 251         .setup          = ixdp2800_pci_setup,
 252         .preinit        = ixdp2800_pci_preinit,
 253         .postinit       = ixdp2800_pci_postinit,
 254         .scan           = ixp2000_pci_scan_bus,
 255         .map_irq        = ixdp2800_pci_map_irq,
 256 };
 257
 258 int __init ixdp2800_pci_init(void)
 259 {
 260         if (machine_is_ixdp2800()) {
 261                 struct pci_dev *dev;
 262
 263                 pci_common_init(&ixdp2800_pci);
 264                 if (ixdp2x00_master_npu()) {
 265                         dev = pci_find_slot(1, IXDP2800_SLAVE_ENET_DEVFN);
 266                         pci_remove_bus_device(dev);
 267
 268                         ixdp2800_master_enable_slave();
 269                         ixdp2800_master_wait_for_slave_bus_scan();
 270                 } else {
 271                         dev = pci_find_slot(1, IXDP2800_MASTER_ENET_DEVFN);
 272                         pci_remove_bus_device(dev);
 273                 }
 274         }
 275
 276         return 0;
 277 }
 278
 279 subsys_initcall(ixdp2800_pci_init);
 280
 281 void ixdp2800_init_irq(void)
 282 {
 283         ixdp2x00_init_irq(IXDP2800_CPLD_INT_STAT, IXDP2800_CPLD_INT_MASK, IXDP2800_NR_IRQS);
 284 }
 285
 286 MACHINE_START(IXDP2800, "Intel IXDP2800 Development Platform")
 287         MAINTAINER("MontaVista Software, Inc.")
 288         BOOT_MEM(0x00000000, IXP2000_UART_PHYS_BASE, IXP2000_UART_VIRT_BASE)
 289         BOOT_PARAMS(0x00000100)
 290         MAPIO(ixdp2x00_map_io)
 291         INITIRQ(ixdp2800_init_irq)
 292         .timer          = &ixdp2800_timer,
 293         INIT_MACHINE(ixdp2x00_init_machine)
 294 MACHINE_END
 295