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