arch/arm/mach-ixp2000/ixdp2800.c

   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/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/mm.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/device.h>
  23 #include <linux/bitops.h>
  24 #include <linux/pci.h>
  25 #include <linux/ioport.h>
  26 #include <linux/delay.h>
  27 #include <linux/io.h>
  28
  29 #include <asm/irq.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/page.h>
  32 #include <asm/system.h>
  33 #include <mach/hardware.h>
  34 #include <asm/mach-types.h>
  35
  36 #include <asm/mach/pci.h>
  37 #include <asm/mach/map.h>
  38 #include <asm/mach/irq.h>
  39 #include <asm/mach/time.h>
  40 #include <asm/mach/flash.h>
  41 #include <asm/mach/arch.h>
  42
  43 /*************************************************************************
  44  * IXDP2800 timer tick
  45  *************************************************************************/
  46
  47 static void __init ixdp2800_timer_init(void)
  48 {
  49         ixp2000_init_time(50000000);
  50 }
  51
  52 static struct sys_timer ixdp2800_timer = {
  53         .init           = ixdp2800_timer_init,
  54         .offset         = ixp2000_gettimeoffset,
  55 };
  56
  57 /*************************************************************************
  58  * IXDP2800 PCI
  59  *************************************************************************/
  60 static void __init ixdp2800_slave_disable_pci_master(void)
  61 {
  62         *IXP2000_PCI_CMDSTAT &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
  63 }
  64
  65 static void __init ixdp2800_master_wait_for_slave(void)
  66 {
  67         volatile u32 *addr;
  68
  69         printk(KERN_INFO "IXDP2800: waiting for slave NPU to configure "
  70                          "its BAR sizes\n");
  71
  72         addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
  73                                         PCI_BASE_ADDRESS_1);
  74         do {
  75                 *addr = 0xffffffff;
  76                 cpu_relax();
  77         } while (*addr != 0xfe000008);
  78
  79         addr = ixp2000_pci_config_addr(0, IXDP2X00_SLAVE_NPU_DEVFN,
  80                                         PCI_BASE_ADDRESS_2);
  81         do {
  82                 *addr = 0xffffffff;
  83                 cpu_relax();
  84         } while (*addr != 0xc0000008);
  85
  86         /*
  87          * Configure the slave's SDRAM BAR by hand.
  88          */
  89         *addr = 0x40000008;
  90 }
  91
  92 static void __init ixdp2800_slave_wait_for_master_enable(void)
  93 {
  94         printk(KERN_INFO "IXDP2800: waiting for master NPU to enable us\n");
  95
  96         while ((*IXP2000_PCI_CMDSTAT & PCI_COMMAND_MASTER) == 0)
  97                 cpu_relax();
  98 }
  99
 100 void __init ixdp2800_pci_preinit(void)
 101 {
 102         printk("ixdp2x00_pci_preinit called\n");
 103
 104         *IXP2000_PCI_ADDR_EXT = 0x0001e000;
 105
 106         if (!ixdp2x00_master_npu())
 107                 ixdp2800_slave_disable_pci_master();
 108
 109         *IXP2000_PCI_SRAM_BASE_ADDR_MASK = (0x2000000 - 1) & ~0x3ffff;
 110         *IXP2000_PCI_DRAM_BASE_ADDR_MASK = (0x40000000 - 1) & ~0xfffff;
 111
 112         ixp2000_pci_preinit();
 113
 114         if (ixdp2x00_master_npu()) {
 115                 /*
 116                  * Wait until the slave set its SRAM/SDRAM BAR sizes
 117                  * correctly before we proceed to scan and enumerate
 118                  * the bus.
 119                  */
 120                 ixdp2800_master_wait_for_slave();
 121
 122                 /*
 123                  * We configure the SDRAM BARs by hand because they
 124                  * are 1G and fall outside of the regular allocated
 125                  * PCI address space.
 126                  */
 127                 *IXP2000_PCI_SDRAM_BAR = 0x00000008;
 128         } else {
 129                 /*
 130                  * Wait for the master to complete scanning the bus
 131                  * and assigning resources before we proceed to scan
 132                  * the bus ourselves.  Set pci=firmware to honor the
 133                  * master's resource assignment.
 134                  */
 135                 ixdp2800_slave_wait_for_master_enable();
 136                 pcibios_setup("firmware");
 137         }
 138 }
 139
 140 /*
 141  * We assign the SDRAM BARs for the two IXP2800 CPUs by hand, outside
 142  * of the regular PCI window, because there's only 512M of outbound PCI
 143  * memory window on each IXP, while we need 1G for each of the BARs.
 144  */
 145 static void __devinit ixp2800_pci_fixup(struct pci_dev *dev)
 146 {
 147         if (machine_is_ixdp2800()) {
 148                 dev->resource[2].start = 0;
 149                 dev->resource[2].end   = 0;
 150                 dev->resource[2].flags = 0;
 151         }
 152 }
 153 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IXP2800, ixp2800_pci_fixup);
 154
 155 static int __init ixdp2800_pci_setup(int nr, struct pci_sys_data *sys)
 156 {
 157         sys->mem_offset = 0x00000000;
 158
 159         ixp2000_pci_setup(nr, sys);
 160
 161         return 1;
 162 }
 163
 164 static int __init ixdp2800_pci_map_irq(const struct pci_dev *dev, u8 slot,
 165         u8 pin)
 166 {
 167         if (ixdp2x00_master_npu()) {
 168
 169                 /*
 170                  * Root bus devices.  Slave NPU is only one with interrupt.
 171                  * Everything else, we just return -1 which is invalid.
 172                  */
 173                 if(!dev->bus->self) {
 174                         if(dev->devfn == IXDP2X00_SLAVE_NPU_DEVFN )
 175                                 return IRQ_IXDP2800_INGRESS_NPU;
 176
 177                         return -1;
 178                 }
 179
 180                 /*
 181                  * Bridge behind the PMC slot.
 182                  */
 183                 if(dev->bus->self->devfn == IXDP2X00_PMC_DEVFN &&
 184                         dev->bus->parent->self->devfn == IXDP2X00_P2P_DEVFN &&
 185                         !dev->bus->parent->self->bus->parent)
 186                                   return IRQ_IXDP2800_PMC;
 187
 188                 /*
 189                  * Device behind the first bridge
 190                  */
 191                 if(dev->bus->self->devfn == IXDP2X00_P2P_DEVFN) {
 192                         switch(dev->devfn) {
 193                                 case IXDP2X00_PMC_DEVFN:
 194                                         return IRQ_IXDP2800_PMC;
 195
 196                                 case IXDP2800_MASTER_ENET_DEVFN:
 197                                         return IRQ_IXDP2800_EGRESS_ENET;
 198
 199                                 case IXDP2800_SWITCH_FABRIC_DEVFN:
 200                                         return IRQ_IXDP2800_FABRIC;
 201                         }
 202                 }
 203
 204                 return -1;
 205         } else return IRQ_IXP2000_PCIB; /* Slave NIC interrupt */
 206 }
 207
 208 static void __init ixdp2800_master_enable_slave(void)
 209 {
 210         volatile u32 *addr;
 211
 212         printk(KERN_INFO "IXDP2800: enabling slave NPU\n");
 213
 214         addr = (volatile u32 *)ixp2000_pci_config_addr(0,
 215                                         IXDP2X00_SLAVE_NPU_DEVFN,
 216                                         PCI_COMMAND);
 217
 218         *addr |= PCI_COMMAND_MASTER;
 219 }
 220
 221 static void __init ixdp2800_master_wait_for_slave_bus_scan(void)
 222 {
 223         volatile u32 *addr;
 224
 225         printk(KERN_INFO "IXDP2800: waiting for slave to finish bus scan\n");
 226
 227         addr = (volatile u32 *)ixp2000_pci_config_addr(0,
 228                                         IXDP2X00_SLAVE_NPU_DEVFN,
 229                                         PCI_COMMAND);
 230         while ((*addr & PCI_COMMAND_MEMORY) == 0)
 231                 cpu_relax();
 232 }
 233
 234 static void __init ixdp2800_slave_signal_bus_scan_completion(void)
 235 {
 236         printk(KERN_INFO "IXDP2800: bus scan done, signaling master\n");
 237         *IXP2000_PCI_CMDSTAT |= PCI_COMMAND_MEMORY;
 238 }
 239
 240 static void __init ixdp2800_pci_postinit(void)
 241 {
 242         if (!ixdp2x00_master_npu()) {
 243                 ixdp2x00_slave_pci_postinit();
 244                 ixdp2800_slave_signal_bus_scan_completion();
 245         }
 246 }
 247
 248 struct __initdata hw_pci ixdp2800_pci __initdata = {
 249         .nr_controllers = 1,
 250         .setup          = ixdp2800_pci_setup,
 251         .preinit        = ixdp2800_pci_preinit,
 252         .postinit       = ixdp2800_pci_postinit,
 253         .scan           = ixp2000_pci_scan_bus,
 254         .map_irq        = ixdp2800_pci_map_irq,
 255 };
 256
 257 int __init ixdp2800_pci_init(void)
 258 {
 259         if (machine_is_ixdp2800()) {
 260                 struct pci_dev *dev;
 261
 262                 pci_common_init(&ixdp2800_pci);
 263                 if (ixdp2x00_master_npu()) {
 264                         dev = pci_get_bus_and_slot(1, IXDP2800_SLAVE_ENET_DEVFN);
 265                         pci_remove_bus_device(dev);
 266                         pci_dev_put(dev);
 267
 268                         ixdp2800_master_enable_slave();
 269                         ixdp2800_master_wait_for_slave_bus_scan();
 270                 } else {
 271                         dev = pci_get_bus_and_slot(1, IXDP2800_MASTER_ENET_DEVFN);
 272                         pci_remove_bus_device(dev);
 273                         pci_dev_put(dev);
 274                 }
 275         }
 276
 277         return 0;
 278 }
 279
 280 subsys_initcall(ixdp2800_pci_init);
 281
 282 void __init ixdp2800_init_irq(void)
 283 {
 284         ixdp2x00_init_irq(IXDP2800_CPLD_INT_STAT, IXDP2800_CPLD_INT_MASK, IXDP2800_NR_IRQS);
 285 }
 286
 287 MACHINE_START(IXDP2800, "Intel IXDP2800 Development Platform")
 288         /* Maintainer: MontaVista Software, Inc. */
 289         .atag_offset    = 0x100,
 290         .map_io         = ixdp2x00_map_io,
 291         .init_irq       = ixdp2800_init_irq,
 292         .timer          = &ixdp2800_timer,
 293         .init_machine   = ixdp2x00_init_machine,
 294 MACHINE_END
 295