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pci-bridge.h

#ifndef _ASM_POWERPC_PCI_BRIDGE_H
#define _ASM_POWERPC_PCI_BRIDGE_H
#ifdef __KERNEL__
/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <linux/pci.h>
#include <linux/list.h>
#include <linux/ioport.h>

struct device_node;

extern unsigned int ppc_pci_flags;
enum {
      /* Force re-assigning all resources (ignore firmware
       * setup completely)
       */
      PPC_PCI_REASSIGN_ALL_RSRC     = 0x00000001,

      /* Re-assign all bus numbers */
      PPC_PCI_REASSIGN_ALL_BUS      = 0x00000002,

      /* Do not try to assign, just use existing setup */
      PPC_PCI_PROBE_ONLY            = 0x00000004,

      /* Don't bother with ISA alignment unless the bridge has
       * ISA forwarding enabled
       */
      PPC_PCI_CAN_SKIP_ISA_ALIGN    = 0x00000008,

      /* Enable domain numbers in /proc */
      PPC_PCI_ENABLE_PROC_DOMAINS   = 0x00000010,
      /* ... except for domain 0 */
      PPC_PCI_COMPAT_DOMAIN_0       = 0x00000020,
};


/*
 * Structure of a PCI controller (host bridge)
 */
struct pci_controller {
      struct pci_bus *bus;
      char is_dynamic;
#ifdef CONFIG_PPC64
      int node;
#endif
      struct device_node *dn;
      struct list_head list_node;
      struct device *parent;

      int first_busno;
      int last_busno;
#ifndef CONFIG_PPC64
      int self_busno;
#endif

      void __iomem *io_base_virt;
#ifdef CONFIG_PPC64
      void *io_base_alloc;
#endif
      resource_size_t io_base_phys;
#ifndef CONFIG_PPC64
      resource_size_t pci_io_size;
#endif

      /* Some machines (PReP) have a non 1:1 mapping of
       * the PCI memory space in the CPU bus space
       */
      resource_size_t pci_mem_offset;
#ifdef CONFIG_PPC64
      unsigned long pci_io_size;
#endif

      struct pci_ops *ops;
      unsigned int __iomem *cfg_addr;
      void __iomem *cfg_data;

#ifndef CONFIG_PPC64
      /*
       * Used for variants of PCI indirect handling and possible quirks:
       *  SET_CFG_TYPE - used on 4xx or any PHB that does explicit type0/1
       *  EXT_REG - provides access to PCI-e extended registers
       *  SURPRESS_PRIMARY_BUS - we surpress the setting of PCI_PRIMARY_BUS
       *   on Freescale PCI-e controllers since they used the PCI_PRIMARY_BUS
       *   to determine which bus number to match on when generating type0
       *   config cycles
       *  NO_PCIE_LINK - the Freescale PCI-e controllers have issues with
       *   hanging if we don't have link and try to do config cycles to
       *   anything but the PHB.  Only allow talking to the PHB if this is
       *   set.
       *  BIG_ENDIAN - cfg_addr is a big endian register
       *  BROKEN_MRM - the 440EPx/GRx chips have an errata that causes hangs on
       *   the PLB4.  Effectively disable MRM commands by setting this.
       */
#define PPC_INDIRECT_TYPE_SET_CFG_TYPE          0x00000001
#define PPC_INDIRECT_TYPE_EXT_REG         0x00000002
#define PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS  0x00000004
#define PPC_INDIRECT_TYPE_NO_PCIE_LINK          0x00000008
#define PPC_INDIRECT_TYPE_BIG_ENDIAN            0x00000010
#define PPC_INDIRECT_TYPE_BROKEN_MRM            0x00000020
      u32 indirect_type;
#endif      /* !CONFIG_PPC64 */
      /* Currently, we limit ourselves to 1 IO range and 3 mem
       * ranges since the common pci_bus structure can't handle more
       */
      struct resource   io_resource;
      struct resource mem_resources[3];
      int global_number;            /* PCI domain number */
#ifdef CONFIG_PPC64
      unsigned long buid;
      unsigned long dma_window_base_cur;
      unsigned long dma_window_size;

      void *private_data;
#endif      /* CONFIG_PPC64 */
};

#ifndef CONFIG_PPC64

static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
{
      return bus->sysdata;
}

static inline int isa_vaddr_is_ioport(void __iomem *address)
{
      /* No specific ISA handling on ppc32 at this stage, it
       * all goes through PCI
       */
      return 0;
}

/* These are used for config access before all the PCI probing
   has been done. */
extern int early_read_config_byte(struct pci_controller *hose, int bus,
                  int dev_fn, int where, u8 *val);
extern int early_read_config_word(struct pci_controller *hose, int bus,
                  int dev_fn, int where, u16 *val);
extern int early_read_config_dword(struct pci_controller *hose, int bus,
                  int dev_fn, int where, u32 *val);
extern int early_write_config_byte(struct pci_controller *hose, int bus,
                  int dev_fn, int where, u8 val);
extern int early_write_config_word(struct pci_controller *hose, int bus,
                  int dev_fn, int where, u16 val);
extern int early_write_config_dword(struct pci_controller *hose, int bus,
                  int dev_fn, int where, u32 val);

extern int early_find_capability(struct pci_controller *hose, int bus,
                         int dev_fn, int cap);

extern void setup_indirect_pci(struct pci_controller* hose,
                         resource_size_t cfg_addr,
                         resource_size_t cfg_data, u32 flags);
extern void setup_grackle(struct pci_controller *hose);
#else /* CONFIG_PPC64 */

/*
 * PCI stuff, for nodes representing PCI devices, pointed to
 * by device_node->data.
 */
struct iommu_table;

struct pci_dn {
      int   busno;                  /* pci bus number */
      int   devfn;                  /* pci device and function number */

      struct  pci_controller *phb;  /* for pci devices */
      struct      iommu_table *iommu_table;     /* for phb's or bridges */
      struct      device_node *node;      /* back-pointer to the device_node */

      int   pci_ext_config_space;   /* for pci devices */

#ifdef CONFIG_EEH
      struct      pci_dev *pcidev;  /* back-pointer to the pci device */
      int   class_code;       /* pci device class */
      int   eeh_mode;         /* See eeh.h for possible EEH_MODEs */
      int   eeh_config_addr;
      int   eeh_pe_config_addr; /* new-style partition endpoint address */
      int   eeh_check_count;  /* # times driver ignored error */
      int   eeh_freeze_count; /* # times this device froze up. */
      int   eeh_false_positives;    /* # times this device reported #ff's */
      u32   config_space[16]; /* saved PCI config space */
#endif
};

/* Get the pointer to a device_node's pci_dn */
#define PCI_DN(dn)      ((struct pci_dn *) (dn)->data)

extern struct device_node *fetch_dev_dn(struct pci_dev *dev);

/* Get a device_node from a pci_dev.  This code must be fast except
 * in the case where the sysdata is incorrect and needs to be fixed
 * up (this will only happen once).
 * In this case the sysdata will have been inherited from a PCI host
 * bridge or a PCI-PCI bridge further up the tree, so it will point
 * to a valid struct pci_dn, just not the one we want.
 */
static inline struct device_node *pci_device_to_OF_node(struct pci_dev *dev)
{
      struct device_node *dn = dev->sysdata;
      struct pci_dn *pdn = dn->data;

      if (pdn && pdn->devfn == dev->devfn && pdn->busno == dev->bus->number)
            return dn;  /* fast path.  sysdata is good */
      return fetch_dev_dn(dev);
}

static inline int pci_device_from_OF_node(struct device_node *np,
                                u8 *bus, u8 *devfn)
{
      if (!PCI_DN(np))
            return -ENODEV;
      *bus = PCI_DN(np)->busno;
      *devfn = PCI_DN(np)->devfn;
      return 0;
}

static inline struct device_node *pci_bus_to_OF_node(struct pci_bus *bus)
{
      if (bus->self)
            return pci_device_to_OF_node(bus->self);
      else
            return bus->sysdata; /* Must be root bus (PHB) */
}

/** Find the bus corresponding to the indicated device node */
extern struct pci_bus *pcibios_find_pci_bus(struct device_node *dn);

/** Remove all of the PCI devices under this bus */
extern void pcibios_remove_pci_devices(struct pci_bus *bus);

/** Discover new pci devices under this bus, and add them */
extern void pcibios_add_pci_devices(struct pci_bus *bus);
extern void pcibios_fixup_new_pci_devices(struct pci_bus *bus);

extern int pcibios_remove_root_bus(struct pci_controller *phb);

static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
{
      struct device_node *busdn = bus->sysdata;

      BUG_ON(busdn == NULL);
      return PCI_DN(busdn)->phb;
}


extern void isa_bridge_find_early(struct pci_controller *hose);

static inline int isa_vaddr_is_ioport(void __iomem *address)
{
      /* Check if address hits the reserved legacy IO range */
      unsigned long ea = (unsigned long)address;
      return ea >= ISA_IO_BASE && ea < ISA_IO_END;
}

extern int pcibios_unmap_io_space(struct pci_bus *bus);
extern int pcibios_map_io_space(struct pci_bus *bus);

/* Return values for ppc_md.pci_probe_mode function */
#define PCI_PROBE_NONE        -1    /* Don't look at this bus at all */
#define PCI_PROBE_NORMAL      0     /* Do normal PCI probing */
#define PCI_PROBE_DEVTREE     1     /* Instantiate from device tree */

#ifdef CONFIG_NUMA
#define PHB_SET_NODE(PHB, NODE)           ((PHB)->node = (NODE))
#else
#define PHB_SET_NODE(PHB, NODE)           ((PHB)->node = -1)
#endif

#endif      /* CONFIG_PPC64 */

/* Get the PCI host controller for an OF device */
extern struct pci_controller *pci_find_hose_for_OF_device(
                  struct device_node* node);

/* Fill up host controller resources from the OF node */
extern void pci_process_bridge_OF_ranges(struct pci_controller *hose,
                  struct device_node *dev, int primary);

/* Allocate & free a PCI host bridge structure */
extern struct pci_controller *pcibios_alloc_controller(struct device_node *dev);
extern void pcibios_free_controller(struct pci_controller *phb);

#ifdef CONFIG_PCI
extern unsigned long pci_address_to_pio(phys_addr_t address);
extern int pcibios_vaddr_is_ioport(void __iomem *address);
#else
static inline unsigned long pci_address_to_pio(phys_addr_t address)
{
      return (unsigned long)-1;
}
static inline int pcibios_vaddr_is_ioport(void __iomem *address)
{
      return 0;
}
#endif      /* CONFIG_PCI */

#endif      /* __KERNEL__ */
#endif      /* _ASM_POWERPC_PCI_BRIDGE_H */

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