arch/mips/pci/pci-ip27.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2003 Christoph Hellwig (hch@lst.de)
   7  * Copyright (C) 1999, 2000, 04 Ralf Baechle (ralf@linux-mips.org)
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/export.h>
  12 #include <linux/pci.h>
  13 #include <linux/smp.h>
  14 #include <asm/sn/arch.h>
  15 #include <asm/pci/bridge.h>
  16 #include <asm/paccess.h>
  17 #include <asm/sn/intr.h>
  18 #include <asm/sn/sn0/hub.h>
  19
  20 /*
  21  * Max #PCI busses we can handle; ie, max #PCI bridges.
  22  */
  23 #define MAX_PCI_BUSSES          40
  24
  25 /*
  26  * Max #PCI devices (like scsi controllers) we handle on a bus.
  27  */
  28 #define MAX_DEVICES_PER_PCIBUS  8
  29
  30 /*
  31  * XXX: No kmalloc available when we do our crosstalk scan,
  32  *      we should try to move it later in the boot process.
  33  */
  34 static struct bridge_controller bridges[MAX_PCI_BUSSES];
  35
  36 /*
  37  * Translate from irq to software PCI bus number and PCI slot.
  38  */
  39 struct bridge_controller *irq_to_bridge[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
  40 int irq_to_slot[MAX_PCI_BUSSES * MAX_DEVICES_PER_PCIBUS];
  41
  42 extern struct pci_ops bridge_pci_ops;
  43
  44 int bridge_probe(nasid_t nasid, int widget_id, int masterwid)
  45 {
  46         unsigned long offset = NODE_OFFSET(nasid);
  47         struct bridge_controller *bc;
  48         static int num_bridges = 0;
  49         bridge_t *bridge;
  50         int slot;
  51
  52         pci_set_flags(PCI_PROBE_ONLY);
  53
  54         printk("a bridge\n");
  55
  56         /* XXX: kludge alert.. */
  57         if (!num_bridges)
  58                 ioport_resource.end = ~0UL;
  59
  60         bc = &bridges[num_bridges];
  61
  62         bc->pc.pci_ops          = &bridge_pci_ops;
  63         bc->pc.mem_resource     = &bc->mem;
  64         bc->pc.io_resource      = &bc->io;
  65
  66         bc->pc.index            = num_bridges;
  67
  68         bc->mem.name            = "Bridge PCI MEM";
  69         bc->pc.mem_offset       = offset;
  70         bc->mem.start           = 0;
  71         bc->mem.end             = ~0UL;
  72         bc->mem.flags           = IORESOURCE_MEM;
  73
  74         bc->io.name             = "Bridge IO MEM";
  75         bc->pc.io_offset        = offset;
  76         bc->io.start            = 0UL;
  77         bc->io.end              = ~0UL;
  78         bc->io.flags            = IORESOURCE_IO;
  79
  80         bc->irq_cpu = smp_processor_id();
  81         bc->widget_id = widget_id;
  82         bc->nasid = nasid;
  83
  84         bc->baddr = (u64)masterwid << 60 | PCI64_ATTR_BAR;
  85
  86         /*
  87          * point to this bridge
  88          */
  89         bridge = (bridge_t *) RAW_NODE_SWIN_BASE(nasid, widget_id);
  90
  91         /*
  92          * Clear all pending interrupts.
  93          */
  94         bridge->b_int_rst_stat = BRIDGE_IRR_ALL_CLR;
  95
  96         /*
  97          * Until otherwise set up, assume all interrupts are from slot 0
  98          */
  99         bridge->b_int_device = 0x0;
 100
 101         /*
 102          * swap pio's to pci mem and io space (big windows)
 103          */
 104         bridge->b_wid_control |= BRIDGE_CTRL_IO_SWAP |
 105                                  BRIDGE_CTRL_MEM_SWAP;
 106 #ifdef CONFIG_PAGE_SIZE_4KB
 107         bridge->b_wid_control &= ~BRIDGE_CTRL_PAGE_SIZE;
 108 #else /* 16kB or larger */
 109         bridge->b_wid_control |= BRIDGE_CTRL_PAGE_SIZE;
 110 #endif
 111
 112         /*
 113          * Hmm...  IRIX sets additional bits in the address which
 114          * are documented as reserved in the bridge docs.
 115          */
 116         bridge->b_wid_int_upper = 0x8000 | (masterwid << 16);
 117         bridge->b_wid_int_lower = 0x01800090;   /* PI_INT_PEND_MOD off*/
 118         bridge->b_dir_map = (masterwid << 20);  /* DMA */
 119         bridge->b_int_enable = 0;
 120
 121         for (slot = 0; slot < 8; slot ++) {
 122                 bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR;
 123                 bc->pci_int[slot] = -1;
 124         }
 125         bridge->b_wid_tflush;     /* wait until Bridge PIO complete */
 126
 127         bc->base = bridge;
 128
 129         register_pci_controller(&bc->pc);
 130
 131         num_bridges++;
 132
 133         return 0;
 134 }
 135
 136 /*
 137  * All observed requests have pin == 1. We could have a global here, that
 138  * gets incremented and returned every time - unfortunately, pci_map_irq
 139  * may be called on the same device over and over, and need to return the
 140  * same value. On O2000, pin can be 0 or 1, and PCI slots can be [0..7].
 141  *
 142  * A given PCI device, in general, should be able to intr any of the cpus
 143  * on any one of the hubs connected to its xbow.
 144  */
 145 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 146 {
 147         return 0;
 148 }
 149
 150 static inline struct pci_dev *bridge_root_dev(struct pci_dev *dev)
 151 {
 152         while (dev->bus->parent) {
 153                 /* Move up the chain of bridges. */
 154                 dev = dev->bus->self;
 155         }
 156
 157         return dev;
 158 }
 159
 160 /* Do platform specific device initialization at pci_enable_device() time */
 161 int pcibios_plat_dev_init(struct pci_dev *dev)
 162 {
 163         struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
 164         struct pci_dev *rdev = bridge_root_dev(dev);
 165         int slot = PCI_SLOT(rdev->devfn);
 166         int irq;
 167
 168         irq = bc->pci_int[slot];
 169         if (irq == -1) {
 170                 irq = request_bridge_irq(bc);
 171                 if (irq < 0)
 172                         return irq;
 173
 174                 bc->pci_int[slot] = irq;
 175         }
 176
 177         irq_to_bridge[irq] = bc;
 178         irq_to_slot[irq] = slot;
 179
 180         dev->irq = irq;
 181
 182         return 0;
 183 }
 184
 185 /*
 186  * Device might live on a subordinate PCI bus.  XXX Walk up the chain of buses
 187  * to find the slot number in sense of the bridge device register.
 188  * XXX This also means multiple devices might rely on conflicting bridge
 189  * settings.
 190  */
 191
 192 static inline void pci_disable_swapping(struct pci_dev *dev)
 193 {
 194         struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
 195         bridge_t *bridge = bc->base;
 196         int slot = PCI_SLOT(dev->devfn);
 197
 198         /* Turn off byte swapping */
 199         bridge->b_device[slot].reg &= ~BRIDGE_DEV_SWAP_DIR;
 200         bridge->b_widget.w_tflush;      /* Flush */
 201 }
 202
 203 static inline void pci_enable_swapping(struct pci_dev *dev)
 204 {
 205         struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
 206         bridge_t *bridge = bc->base;
 207         int slot = PCI_SLOT(dev->devfn);
 208
 209         /* Turn on byte swapping */
 210         bridge->b_device[slot].reg |= BRIDGE_DEV_SWAP_DIR;
 211         bridge->b_widget.w_tflush;      /* Flush */
 212 }
 213
 214 static void pci_fixup_ioc3(struct pci_dev *d)
 215 {
 216         pci_disable_swapping(d);
 217 }
 218
 219 #ifdef CONFIG_NUMA
 220 int pcibus_to_node(struct pci_bus *bus)
 221 {
 222         struct bridge_controller *bc = BRIDGE_CONTROLLER(bus);
 223
 224         return bc->nasid;
 225 }
 226 EXPORT_SYMBOL(pcibus_to_node);
 227 #endif /* CONFIG_NUMA */
 228
 229 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,
 230         pci_fixup_ioc3);