target/linux/brcm47xx/patches-2.6.25/690-mips-allow-pciregister-after-boot.patch

   1 Allow registering PCI devices after early boot.
   2
   3 This is an ugly hack and needs to be rewritten before going upstream.
   4 Index: linux-2.6.23.16/arch/mips/pci/pci.c
   5 ===================================================================
   6 --- linux-2.6.23.16.orig/arch/mips/pci/pci.c    2008-02-20 16:06:36.000000000 +0100
   7 +++ linux-2.6.23.16/arch/mips/pci/pci.c 2008-02-20 16:09:33.000000000 +0100
   8 @@ -21,6 +21,17 @@
   9   */
  10  int pci_probe_only;
  11
  12 +/*
  13 + * Indicate whether PCI-bios init was already done.
  14 + */
  15 +static int pcibios_init_done;
  16 +
  17 +/*
  18 + * The currently used busnumber.
  19 + */
  20 +static int next_busno;
  21 +static int need_domain_info;
  22 +
  23  #define PCI_ASSIGN_ALL_BUSSES  1
  24
  25  unsigned int pci_probe = PCI_ASSIGN_ALL_BUSSES;
  26 @@ -75,8 +86,32 @@ pcibios_align_resource(void *data, struc
  27         res->start = start;
  28  }
  29
  30 -void __devinit register_pci_controller(struct pci_controller *hose)
  31 +/* Most MIPS systems have straight-forward swizzling needs.  */
  32 +
  33 +static inline u8 bridge_swizzle(u8 pin, u8 slot)
  34 +{
  35 +       return (((pin - 1) + slot) % 4) + 1;
  36 +}
  37 +
  38 +static u8 common_swizzle(struct pci_dev *dev, u8 *pinp)
  39  {
  40 +       u8 pin = *pinp;
  41 +
  42 +       while (dev->bus->parent) {
  43 +               pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
  44 +               /* Move up the chain of bridges. */
  45 +               dev = dev->bus->self;
  46 +        }
  47 +       *pinp = pin;
  48 +
  49 +       /* The slot is the slot of the last bridge. */
  50 +       return PCI_SLOT(dev->devfn);
  51 +}
  52 +
  53 +void register_pci_controller(struct pci_controller *hose)
  54 +{
  55 +       struct pci_bus *bus;
  56 +
  57         if (request_resource(&iomem_resource, hose->mem_resource) < 0)
  58                 goto out;
  59         if (request_resource(&ioport_resource, hose->io_resource) < 0) {
  60 @@ -84,9 +119,6 @@ void __devinit register_pci_controller(s
  61                 goto out;
  62         }
  63
  64 -       *hose_tail = hose;
  65 -       hose_tail = &hose->next;
  66 -
  67         /*
  68          * Do not panic here but later - this might hapen before console init.
  69          */
  70 @@ -94,41 +126,47 @@ void __devinit register_pci_controller(s
  71                 printk(KERN_WARNING
  72                        "registering PCI controller with io_map_base unset\n");
  73         }
  74 -       return;
  75
  76 -out:
  77 -       printk(KERN_WARNING
  78 -              "Skipping PCI bus scan due to resource conflict\n");
  79 -}
  80 +       if (pcibios_init_done) {
  81 +               //TODO
  82
  83 -/* Most MIPS systems have straight-forward swizzling needs.  */
  84 +               printk(KERN_INFO "Registering a PCI bus after boot\n");
  85
  86 -static inline u8 bridge_swizzle(u8 pin, u8 slot)
  87 -{
  88 -       return (((pin - 1) + slot) % 4) + 1;
  89 -}
  90 +               if (!hose->iommu)
  91 +                       PCI_DMA_BUS_IS_PHYS = 1;
  92
  93 -static u8 __init common_swizzle(struct pci_dev *dev, u8 *pinp)
  94 -{
  95 -       u8 pin = *pinp;
  96 +               bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
  97 +               hose->bus = bus;
  98 +               need_domain_info = need_domain_info || hose->index;
  99 +               hose->need_domain_info = need_domain_info;
 100 +               if (bus) {
 101 +                       next_busno = bus->subordinate + 1;
 102 +                       /* Don't allow 8-bit bus number overflow inside the hose -
 103 +                          reserve some space for bridges. */
 104 +                       if (next_busno > 224) {
 105 +                               next_busno = 0;
 106 +                               need_domain_info = 1;
 107 +                       }
 108 +               }
 109 +               if (!pci_probe_only)
 110 +                       pci_assign_unassigned_resources();
 111 +               pci_fixup_irqs(common_swizzle, pcibios_map_irq);
 112 +       } else {
 113 +               *hose_tail = hose;
 114 +               hose_tail = &hose->next;
 115 +       }
 116
 117 -       while (dev->bus->parent) {
 118 -               pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
 119 -               /* Move up the chain of bridges. */
 120 -               dev = dev->bus->self;
 121 -        }
 122 -       *pinp = pin;
 123 +       return;
 124
 125 -       /* The slot is the slot of the last bridge. */
 126 -       return PCI_SLOT(dev->devfn);
 127 +out:
 128 +       printk(KERN_WARNING
 129 +              "Skipping PCI bus scan due to resource conflict\n");
 130  }
 131
 132  static int __init pcibios_init(void)
 133  {
 134         struct pci_controller *hose;
 135         struct pci_bus *bus;
 136 -       int next_busno;
 137 -       int need_domain_info = 0;
 138
 139         /* Scan all of the recorded PCI controllers.  */
 140         for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
 141 @@ -157,6 +195,7 @@ static int __init pcibios_init(void)
 142         if (!pci_probe_only)
 143                 pci_assign_unassigned_resources();
 144         pci_fixup_irqs(common_swizzle, pcibios_map_irq);
 145 +       pcibios_init_done = 1;
 146
 147         return 0;
 148  }
 149 Index: linux-2.6.23.16/drivers/ssb/main.c
 150 ===================================================================
 151 --- linux-2.6.23.16.orig/drivers/ssb/main.c     2008-02-20 16:06:36.000000000 +0100
 152 +++ linux-2.6.23.16/drivers/ssb/main.c  2008-02-20 18:33:21.000000000 +0100
 153 @@ -1185,9 +1185,7 @@ static int __init ssb_modinit(void)
 154  /* ssb must be initialized after PCI but before the ssb drivers.
 155   * That means we must use some initcall between subsys_initcall
 156   * and device_initcall. */
 157 -//FIXME on embedded we need to be early to make sure we can register
 158 -//      a new PCI bus, if needed.
 159 -subsys_initcall(ssb_modinit);
 160 +fs_initcall(ssb_modinit);
 161
 162  static void __exit ssb_modexit(void)
 163  {