arch/powerpc/platforms/85xx/pci.c

   1 /*
   2  * FSL SoC setup code
   3  *
   4  * Maintained by Kumar Gala (see MAINTAINERS for contact information)
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/errno.h>
  16 #include <linux/pci.h>
  17 #include <linux/delay.h>
  18 #include <linux/irq.h>
  19 #include <linux/module.h>
  20
  21 #include <asm/system.h>
  22 #include <asm/atomic.h>
  23 #include <asm/io.h>
  24 #include <asm/pci-bridge.h>
  25 #include <asm/prom.h>
  26 #include <sysdev/fsl_soc.h>
  27
  28 #undef DEBUG
  29
  30 #ifdef DEBUG
  31 #define DBG(x...) printk(x)
  32 #else
  33 #define DBG(x...)
  34 #endif
  35
  36 #ifdef CONFIG_PCI
  37 int __init mpc85xx_add_bridge(struct device_node *dev)
  38 {
  39         int len;
  40         struct pci_controller *hose;
  41         struct resource rsrc;
  42         const int *bus_range;
  43         int primary = 1, has_address = 0;
  44         phys_addr_t immr = get_immrbase();
  45
  46         DBG("Adding PCI host bridge %s\n", dev->full_name);
  47
  48         /* Fetch host bridge registers address */
  49         has_address = (of_address_to_resource(dev, 0, &rsrc) == 0);
  50
  51         /* Get bus range if any */
  52         bus_range = of_get_property(dev, "bus-range", &len);
  53         if (bus_range == NULL || len < 2 * sizeof(int)) {
  54                 printk(KERN_WARNING "Can't get bus-range for %s, assume"
  55                        " bus 0\n", dev->full_name);
  56         }
  57
  58         hose = pcibios_alloc_controller();
  59         if (!hose)
  60                 return -ENOMEM;
  61         hose->arch_data = dev;
  62
  63         hose->first_busno = bus_range ? bus_range[0] : 0;
  64         hose->last_busno = bus_range ? bus_range[1] : 0xff;
  65
  66         /* PCI 1 */
  67         if ((rsrc.start & 0xfffff) == 0x8000) {
  68                 setup_indirect_pci(hose, immr + 0x8000, immr + 0x8004);
  69         }
  70         /* PCI 2 */
  71         if ((rsrc.start & 0xfffff) == 0x9000) {
  72                 setup_indirect_pci(hose, immr + 0x9000, immr + 0x9004);
  73                 primary = 0;
  74                 hose->bus_offset = hose->first_busno;
  75         }
  76
  77         printk(KERN_INFO "Found MPC85xx PCI host bridge at 0x%016llx. "
  78                "Firmware bus number: %d->%d\n",
  79                 (unsigned long long)rsrc.start, hose->first_busno,
  80                 hose->last_busno);
  81
  82         DBG(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n",
  83                 hose, hose->cfg_addr, hose->cfg_data);
  84
  85         /* Interpret the "ranges" property */
  86         /* This also maps the I/O region and sets isa_io/mem_base */
  87         pci_process_bridge_OF_ranges(hose, dev, primary);
  88
  89         return 0;
  90 }
  91
  92 #endif