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pci_32.c

/*
 * Common pmac/prep/chrp pci routines. -- Cort
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/bootmem.h>
#include <linux/irq.h>
#include <linux/list.h>
#include <linux/of.h>

#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/sections.h>
#include <asm/pci-bridge.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include <asm/machdep.h>

#undef DEBUG

#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif

unsigned long isa_io_base     = 0;
unsigned long pci_dram_offset = 0;
int pcibios_assign_bus_offset = 1;

void pcibios_make_OF_bus_map(void);

static void fixup_broken_pcnet32(struct pci_dev* dev);
static void fixup_cpc710_pci64(struct pci_dev* dev);
#ifdef CONFIG_PPC_OF
static u8* pci_to_OF_bus_map;
#endif

/* By default, we don't re-assign bus numbers. We do this only on
 * some pmacs
 */
static int pci_assign_all_buses;

LIST_HEAD(hose_list);

static int pci_bus_count;

/* This will remain NULL for now, until isa-bridge.c is made common
 * to both 32-bit and 64-bit.
 */
struct pci_dev *isa_bridge_pcidev;
EXPORT_SYMBOL_GPL(isa_bridge_pcidev);

static void
fixup_hide_host_resource_fsl(struct pci_dev *dev)
{
      int i, class = dev->class >> 8;

      if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
           class == PCI_CLASS_BRIDGE_OTHER) &&
            (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
            (dev->bus->parent == NULL)) {
            for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
                  dev->resource[i].start = 0;
                  dev->resource[i].end = 0;
                  dev->resource[i].flags = 0;
            }
      }
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl); 
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl); 

static void
fixup_broken_pcnet32(struct pci_dev* dev)
{
      if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {
            dev->vendor = PCI_VENDOR_ID_AMD;
            pci_write_config_word(dev, PCI_VENDOR_ID, PCI_VENDOR_ID_AMD);
      }
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TRIDENT, PCI_ANY_ID,             fixup_broken_pcnet32);

static void
fixup_cpc710_pci64(struct pci_dev* dev)
{
      /* Hide the PCI64 BARs from the kernel as their content doesn't
       * fit well in the resource management
       */
      dev->resource[0].start = dev->resource[0].end = 0;
      dev->resource[0].flags = 0;
      dev->resource[1].start = dev->resource[1].end = 0;
      dev->resource[1].flags = 0;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,     PCI_DEVICE_ID_IBM_CPC710_PCI64,     fixup_cpc710_pci64);

#ifdef CONFIG_PPC_OF
/*
 * Functions below are used on OpenFirmware machines.
 */
static void
make_one_node_map(struct device_node* node, u8 pci_bus)
{
      const int *bus_range;
      int len;

      if (pci_bus >= pci_bus_count)
            return;
      bus_range = of_get_property(node, "bus-range", &len);
      if (bus_range == NULL || len < 2 * sizeof(int)) {
            printk(KERN_WARNING "Can't get bus-range for %s, "
                   "assuming it starts at 0\n", node->full_name);
            pci_to_OF_bus_map[pci_bus] = 0;
      } else
            pci_to_OF_bus_map[pci_bus] = bus_range[0];

      for_each_child_of_node(node, node) {
            struct pci_dev* dev;
            const unsigned int *class_code, *reg;
      
            class_code = of_get_property(node, "class-code", NULL);
            if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
                  (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
                  continue;
            reg = of_get_property(node, "reg", NULL);
            if (!reg)
                  continue;
            dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
            if (!dev || !dev->subordinate) {
                  pci_dev_put(dev);
                  continue;
            }
            make_one_node_map(node, dev->subordinate->number);
            pci_dev_put(dev);
      }
}
      
void
pcibios_make_OF_bus_map(void)
{
      int i;
      struct pci_controller *hose, *tmp;
      struct property *map_prop;
      struct device_node *dn;

      pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
      if (!pci_to_OF_bus_map) {
            printk(KERN_ERR "Can't allocate OF bus map !\n");
            return;
      }

      /* We fill the bus map with invalid values, that helps
       * debugging.
       */
      for (i=0; i<pci_bus_count; i++)
            pci_to_OF_bus_map[i] = 0xff;

      /* For each hose, we begin searching bridges */
      list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
            struct device_node* node = hose->dn;

            if (!node)
                  continue;
            make_one_node_map(node, hose->first_busno);
      }
      dn = of_find_node_by_path("/");
      map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
      if (map_prop) {
            BUG_ON(pci_bus_count > map_prop->length);
            memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
      }
      of_node_put(dn);
#ifdef DEBUG
      printk("PCI->OF bus map:\n");
      for (i=0; i<pci_bus_count; i++) {
            if (pci_to_OF_bus_map[i] == 0xff)
                  continue;
            printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
      }
#endif
}

typedef int (*pci_OF_scan_iterator)(struct device_node* node, void* data);

static struct device_node*
scan_OF_pci_childs(struct device_node *parent, pci_OF_scan_iterator filter, void* data)
{
      struct device_node *node;
      struct device_node* sub_node;

      for_each_child_of_node(parent, node) {
            const unsigned int *class_code;
      
            if (filter(node, data)) {
                  of_node_put(node);
                  return node;
            }

            /* For PCI<->PCI bridges or CardBus bridges, we go down
             * Note: some OFs create a parent node "multifunc-device" as
             * a fake root for all functions of a multi-function device,
             * we go down them as well.
             */
            class_code = of_get_property(node, "class-code", NULL);
            if ((!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
                  (*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS)) &&
                  strcmp(node->name, "multifunc-device"))
                  continue;
            sub_node = scan_OF_pci_childs(node, filter, data);
            if (sub_node) {
                  of_node_put(node);
                  return sub_node;
            }
      }
      return NULL;
}

static struct device_node *scan_OF_for_pci_dev(struct device_node *parent,
                                     unsigned int devfn)
{
      struct device_node *np;
      const u32 *reg;
      unsigned int psize;

      for_each_child_of_node(parent, np) {
            reg = of_get_property(np, "reg", &psize);
            if (reg == NULL || psize < 4)
                  continue;
            if (((reg[0] >> 8) & 0xff) == devfn)
                  return np;
      }
      return NULL;
}


static struct device_node *scan_OF_for_pci_bus(struct pci_bus *bus)
{
      struct device_node *parent, *np;

      /* Are we a root bus ? */
      if (bus->self == NULL || bus->parent == NULL) {
            struct pci_controller *hose = pci_bus_to_host(bus);
            if (hose == NULL)
                  return NULL;
            return of_node_get(hose->dn);
      }

      /* not a root bus, we need to get our parent */
      parent = scan_OF_for_pci_bus(bus->parent);
      if (parent == NULL)
            return NULL;

      /* now iterate for children for a match */
      np = scan_OF_for_pci_dev(parent, bus->self->devfn);
      of_node_put(parent);

      return np;
}

/*
 * Scans the OF tree for a device node matching a PCI device
 */
struct device_node *
pci_busdev_to_OF_node(struct pci_bus *bus, int devfn)
{
      struct device_node *parent, *np;

      if (!have_of)
            return NULL;

      DBG("pci_busdev_to_OF_node(%d,0x%x)\n", bus->number, devfn);
      parent = scan_OF_for_pci_bus(bus);
      if (parent == NULL)
            return NULL;
      DBG(" parent is %s\n", parent ? parent->full_name : "<NULL>");
      np = scan_OF_for_pci_dev(parent, devfn);
      of_node_put(parent);
      DBG(" result is %s\n", np ? np->full_name : "<NULL>");

      /* XXX most callers don't release the returned node
       * mostly because ppc64 doesn't increase the refcount,
       * we need to fix that.
       */
      return np;
}
EXPORT_SYMBOL(pci_busdev_to_OF_node);

struct device_node*
pci_device_to_OF_node(struct pci_dev *dev)
{
      return pci_busdev_to_OF_node(dev->bus, dev->devfn);
}
EXPORT_SYMBOL(pci_device_to_OF_node);

static int
find_OF_pci_device_filter(struct device_node* node, void* data)
{
      return ((void *)node == data);
}

/*
 * Returns the PCI device matching a given OF node
 */
int
pci_device_from_OF_node(struct device_node* node, u8* bus, u8* devfn)
{
      const unsigned int *reg;
      struct pci_controller* hose;
      struct pci_dev* dev = NULL;
      
      if (!have_of)
            return -ENODEV;
      /* Make sure it's really a PCI device */
      hose = pci_find_hose_for_OF_device(node);
      if (!hose || !hose->dn)
            return -ENODEV;
      if (!scan_OF_pci_childs(hose->dn,
                  find_OF_pci_device_filter, (void *)node))
            return -ENODEV;
      reg = of_get_property(node, "reg", NULL);
      if (!reg)
            return -ENODEV;
      *bus = (reg[0] >> 16) & 0xff;
      *devfn = ((reg[0] >> 8) & 0xff);

      /* Ok, here we need some tweak. If we have already renumbered
       * all busses, we can't rely on the OF bus number any more.
       * the pci_to_OF_bus_map is not enough as several PCI busses
       * may match the same OF bus number.
       */
      if (!pci_to_OF_bus_map)
            return 0;

      for_each_pci_dev(dev)
            if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
                        dev->devfn == *devfn) {
                  *bus = dev->bus->number;
                  pci_dev_put(dev);
                  return 0;
            }

      return -ENODEV;
}
EXPORT_SYMBOL(pci_device_from_OF_node);

/* We create the "pci-OF-bus-map" property now so it appears in the
 * /proc device tree
 */
void __init
pci_create_OF_bus_map(void)
{
      struct property* of_prop;
      struct device_node *dn;

      of_prop = (struct property*) alloc_bootmem(sizeof(struct property) + 256);
      if (!of_prop)
            return;
      dn = of_find_node_by_path("/");
      if (dn) {
            memset(of_prop, -1, sizeof(struct property) + 256);
            of_prop->name = "pci-OF-bus-map";
            of_prop->length = 256;
            of_prop->value = &of_prop[1];
            prom_add_property(dn, of_prop);
            of_node_put(dn);
      }
}

#else /* CONFIG_PPC_OF */
void pcibios_make_OF_bus_map(void)
{
}
#endif /* CONFIG_PPC_OF */

static int __init pcibios_init(void)
{
      struct pci_controller *hose, *tmp;
      struct pci_bus *bus;
      int next_busno = 0;

      printk(KERN_INFO "PCI: Probing PCI hardware\n");

      if (ppc_pci_flags & PPC_PCI_REASSIGN_ALL_BUS)
            pci_assign_all_buses = 1;

      /* Scan all of the recorded PCI controllers.  */
      list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
            if (pci_assign_all_buses)
                  hose->first_busno = next_busno;
            hose->last_busno = 0xff;
            bus = pci_scan_bus_parented(hose->parent, hose->first_busno,
                                  hose->ops, hose);
            if (bus) {
                  pci_bus_add_devices(bus);
                  hose->last_busno = bus->subordinate;
            }
            if (pci_assign_all_buses || next_busno <= hose->last_busno)
                  next_busno = hose->last_busno + pcibios_assign_bus_offset;
      }
      pci_bus_count = next_busno;

      /* OpenFirmware based machines need a map of OF bus
       * numbers vs. kernel bus numbers since we may have to
       * remap them.
       */
      if (pci_assign_all_buses && have_of)
            pcibios_make_OF_bus_map();

      /* Call common code to handle resource allocation */
      pcibios_resource_survey();

      /* Call machine dependent post-init code */
      if (ppc_md.pcibios_after_init)
            ppc_md.pcibios_after_init();

      return 0;
}

subsys_initcall(pcibios_init);

void __devinit pcibios_do_bus_setup(struct pci_bus *bus)
{
      struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
      unsigned long io_offset;
      struct resource *res;
      int i;
      struct pci_dev *dev;

      /* Hookup PHB resources */
      io_offset = (unsigned long)hose->io_base_virt - isa_io_base;
      if (bus->parent == NULL) {
            /* This is a host bridge - fill in its resources */
            hose->bus = bus;

            bus->resource[0] = res = &hose->io_resource;
            if (!res->flags) {
                  if (io_offset)
                        printk(KERN_ERR "I/O resource not set for host"
                               " bridge %d\n", hose->global_number);
                  res->start = 0;
                  res->end = IO_SPACE_LIMIT;
                  res->flags = IORESOURCE_IO;
            }
            res->start = (res->start + io_offset) & 0xffffffffu;
            res->end = (res->end + io_offset) & 0xffffffffu;

            for (i = 0; i < 3; ++i) {
                  res = &hose->mem_resources[i];
                  if (!res->flags) {
                        if (i > 0)
                              continue;
                        printk(KERN_ERR "Memory resource not set for "
                               "host bridge %d\n", hose->global_number);
                        res->start = hose->pci_mem_offset;
                        res->end = ~0U;
                        res->flags = IORESOURCE_MEM;
                  }
                  bus->resource[i+1] = res;
            }
      }

      if (ppc_md.pci_dma_bus_setup)
            ppc_md.pci_dma_bus_setup(bus);

      list_for_each_entry(dev, &bus->devices, bus_list)
            pcibios_setup_new_device(dev);
}

/* the next one is stolen from the alpha port... */
void __init
pcibios_update_irq(struct pci_dev *dev, int irq)
{
      pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
      /* XXX FIXME - update OF device tree node interrupt property */
}

static struct pci_controller*
pci_bus_to_hose(int bus)
{
      struct pci_controller *hose, *tmp;

      list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
            if (bus >= hose->first_busno && bus <= hose->last_busno)
                  return hose;
      return NULL;
}

/* Provide information on locations of various I/O regions in physical
 * memory.  Do this on a per-card basis so that we choose the right
 * root bridge.
 * Note that the returned IO or memory base is a physical address
 */

long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
{
      struct pci_controller* hose;
      long result = -EOPNOTSUPP;

      hose = pci_bus_to_hose(bus);
      if (!hose)
            return -ENODEV;

      switch (which) {
      case IOBASE_BRIDGE_NUMBER:
            return (long)hose->first_busno;
      case IOBASE_MEMORY:
            return (long)hose->pci_mem_offset;
      case IOBASE_IO:
            return (long)hose->io_base_phys;
      case IOBASE_ISA_IO:
            return (long)isa_io_base;
      case IOBASE_ISA_MEM:
            return (long)isa_mem_base;
      }

      return result;
}

unsigned long pci_address_to_pio(phys_addr_t address)
{
      struct pci_controller *hose, *tmp;

      list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
            unsigned int size = hose->io_resource.end -
                  hose->io_resource.start + 1;
            if (address >= hose->io_base_phys &&
                address < (hose->io_base_phys + size)) {
                  unsigned long base =
                        (unsigned long)hose->io_base_virt - _IO_BASE;
                  return base + (address - hose->io_base_phys);
            }
      }
      return (unsigned int)-1;
}
EXPORT_SYMBOL(pci_address_to_pio);

/*
 * Null PCI config access functions, for the case when we can't
 * find a hose.
 */
#define NULL_PCI_OP(rw, size, type)                         \
static int                                            \
null_##rw##_config_##size(struct pci_dev *dev, int offset, type val)    \
{                                                     \
      return PCIBIOS_DEVICE_NOT_FOUND;                            \
}

static int
null_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
             int len, u32 *val)
{
      return PCIBIOS_DEVICE_NOT_FOUND;
}

static int
null_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
              int len, u32 val)
{
      return PCIBIOS_DEVICE_NOT_FOUND;
}

static struct pci_ops null_pci_ops =
{
      .read = null_read_config,
      .write = null_write_config,
};

/*
 * These functions are used early on before PCI scanning is done
 * and all of the pci_dev and pci_bus structures have been created.
 */
static struct pci_bus *
fake_pci_bus(struct pci_controller *hose, int busnr)
{
      static struct pci_bus bus;

      if (hose == 0) {
            hose = pci_bus_to_hose(busnr);
            if (hose == 0)
                  printk(KERN_ERR "Can't find hose for PCI bus %d!\n", busnr);
      }
      bus.number = busnr;
      bus.sysdata = hose;
      bus.ops = hose? hose->ops: &null_pci_ops;
      return &bus;
}

#define EARLY_PCI_OP(rw, size, type)                              \
int early_##rw##_config_##size(struct pci_controller *hose, int bus,    \
                         int devfn, int offset, type value) \
{                                                     \
      return pci_bus_##rw##_config_##size(fake_pci_bus(hose, bus),      \
                                  devfn, offset, value);    \
}

EARLY_PCI_OP(read, byte, u8 *)
EARLY_PCI_OP(read, word, u16 *)
EARLY_PCI_OP(read, dword, u32 *)
EARLY_PCI_OP(write, byte, u8)
EARLY_PCI_OP(write, word, u16)
EARLY_PCI_OP(write, dword, u32)

extern int pci_bus_find_capability (struct pci_bus *bus, unsigned int devfn, int cap);
int early_find_capability(struct pci_controller *hose, int bus, int devfn,
                    int cap)
{
      return pci_bus_find_capability(fake_pci_bus(hose, bus), devfn, cap);
}

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