arch/powerpc/include/asm/pci-bridge.h

   1 #ifndef _ASM_POWERPC_PCI_BRIDGE_H
   2 #define _ASM_POWERPC_PCI_BRIDGE_H
   3 #ifdef __KERNEL__
   4 /*
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version
   8  * 2 of the License, or (at your option) any later version.
   9  */
  10 #include <linux/pci.h>
  11 #include <linux/list.h>
  12 #include <linux/ioport.h>
  13
  14 struct device_node;
  15
  16 enum {
  17         /* Force re-assigning all resources (ignore firmware
  18          * setup completely)
  19          */
  20         PPC_PCI_REASSIGN_ALL_RSRC       = 0x00000001,
  21
  22         /* Re-assign all bus numbers */
  23         PPC_PCI_REASSIGN_ALL_BUS        = 0x00000002,
  24
  25         /* Do not try to assign, just use existing setup */
  26         PPC_PCI_PROBE_ONLY              = 0x00000004,
  27
  28         /* Don't bother with ISA alignment unless the bridge has
  29          * ISA forwarding enabled
  30          */
  31         PPC_PCI_CAN_SKIP_ISA_ALIGN      = 0x00000008,
  32
  33         /* Enable domain numbers in /proc */
  34         PPC_PCI_ENABLE_PROC_DOMAINS     = 0x00000010,
  35         /* ... except for domain 0 */
  36         PPC_PCI_COMPAT_DOMAIN_0         = 0x00000020,
  37 };
  38 #ifdef CONFIG_PCI
  39 extern unsigned int ppc_pci_flags;
  40
  41 static inline void ppc_pci_set_flags(int flags)
  42 {
  43         ppc_pci_flags = flags;
  44 }
  45
  46 static inline void ppc_pci_add_flags(int flags)
  47 {
  48         ppc_pci_flags |= flags;
  49 }
  50
  51 static inline int ppc_pci_has_flag(int flag)
  52 {
  53         return (ppc_pci_flags & flag);
  54 }
  55 #else
  56 static inline void ppc_pci_set_flags(int flags) { }
  57 static inline void ppc_pci_add_flags(int flags) { }
  58 static inline int ppc_pci_has_flag(int flag)
  59 {
  60         return 0;
  61 }
  62 #endif
  63
  64
  65 /*
  66  * Structure of a PCI controller (host bridge)
  67  */
  68 struct pci_controller {
  69         struct pci_bus *bus;
  70         char is_dynamic;
  71 #ifdef CONFIG_PPC64
  72         int node;
  73 #endif
  74         struct device_node *dn;
  75         struct list_head list_node;
  76         struct device *parent;
  77
  78         int first_busno;
  79         int last_busno;
  80         int self_busno;
  81
  82         void __iomem *io_base_virt;
  83 #ifdef CONFIG_PPC64
  84         void *io_base_alloc;
  85 #endif
  86         resource_size_t io_base_phys;
  87         resource_size_t pci_io_size;
  88
  89         /* Some machines (PReP) have a non 1:1 mapping of
  90          * the PCI memory space in the CPU bus space
  91          */
  92         resource_size_t pci_mem_offset;
  93
  94         /* Some machines have a special region to forward the ISA
  95          * "memory" cycles such as VGA memory regions. Left to 0
  96          * if unsupported
  97          */
  98         resource_size_t isa_mem_phys;
  99         resource_size_t isa_mem_size;
 100
 101         struct pci_ops *ops;
 102         unsigned int __iomem *cfg_addr;
 103         void __iomem *cfg_data;
 104
 105         /*
 106          * Used for variants of PCI indirect handling and possible quirks:
 107          *  SET_CFG_TYPE - used on 4xx or any PHB that does explicit type0/1
 108          *  EXT_REG - provides access to PCI-e extended registers
 109          *  SURPRESS_PRIMARY_BUS - we surpress the setting of PCI_PRIMARY_BUS
 110          *   on Freescale PCI-e controllers since they used the PCI_PRIMARY_BUS
 111          *   to determine which bus number to match on when generating type0
 112          *   config cycles
 113          *  NO_PCIE_LINK - the Freescale PCI-e controllers have issues with
 114          *   hanging if we don't have link and try to do config cycles to
 115          *   anything but the PHB.  Only allow talking to the PHB if this is
 116          *   set.
 117          *  BIG_ENDIAN - cfg_addr is a big endian register
 118          *  BROKEN_MRM - the 440EPx/GRx chips have an errata that causes hangs on
 119          *   the PLB4.  Effectively disable MRM commands by setting this.
 120          */
 121 #define PPC_INDIRECT_TYPE_SET_CFG_TYPE          0x00000001
 122 #define PPC_INDIRECT_TYPE_EXT_REG               0x00000002
 123 #define PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS  0x00000004
 124 #define PPC_INDIRECT_TYPE_NO_PCIE_LINK          0x00000008
 125 #define PPC_INDIRECT_TYPE_BIG_ENDIAN            0x00000010
 126 #define PPC_INDIRECT_TYPE_BROKEN_MRM            0x00000020
 127         u32 indirect_type;
 128         /* Currently, we limit ourselves to 1 IO range and 3 mem
 129          * ranges since the common pci_bus structure can't handle more
 130          */
 131         struct resource io_resource;
 132         struct resource mem_resources[3];
 133         int global_number;              /* PCI domain number */
 134
 135         resource_size_t dma_window_base_cur;
 136         resource_size_t dma_window_size;
 137
 138 #ifdef CONFIG_PPC64
 139         unsigned long buid;
 140
 141         void *private_data;
 142 #endif  /* CONFIG_PPC64 */
 143 };
 144
 145 /* These are used for config access before all the PCI probing
 146    has been done. */
 147 extern int early_read_config_byte(struct pci_controller *hose, int bus,
 148                         int dev_fn, int where, u8 *val);
 149 extern int early_read_config_word(struct pci_controller *hose, int bus,
 150                         int dev_fn, int where, u16 *val);
 151 extern int early_read_config_dword(struct pci_controller *hose, int bus,
 152                         int dev_fn, int where, u32 *val);
 153 extern int early_write_config_byte(struct pci_controller *hose, int bus,
 154                         int dev_fn, int where, u8 val);
 155 extern int early_write_config_word(struct pci_controller *hose, int bus,
 156                         int dev_fn, int where, u16 val);
 157 extern int early_write_config_dword(struct pci_controller *hose, int bus,
 158                         int dev_fn, int where, u32 val);
 159
 160 extern int early_find_capability(struct pci_controller *hose, int bus,
 161                                  int dev_fn, int cap);
 162
 163 extern void setup_indirect_pci(struct pci_controller* hose,
 164                                resource_size_t cfg_addr,
 165                                resource_size_t cfg_data, u32 flags);
 166
 167 #ifndef CONFIG_PPC64
 168
 169 static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
 170 {
 171         return bus->sysdata;
 172 }
 173
 174 static inline int isa_vaddr_is_ioport(void __iomem *address)
 175 {
 176         /* No specific ISA handling on ppc32 at this stage, it
 177          * all goes through PCI
 178          */
 179         return 0;
 180 }
 181
 182 #else   /* CONFIG_PPC64 */
 183
 184 /*
 185  * PCI stuff, for nodes representing PCI devices, pointed to
 186  * by device_node->data.
 187  */
 188 struct iommu_table;
 189
 190 struct pci_dn {
 191         int     busno;                  /* pci bus number */
 192         int     devfn;                  /* pci device and function number */
 193
 194         struct  pci_controller *phb;    /* for pci devices */
 195         struct  iommu_table *iommu_table;       /* for phb's or bridges */
 196         struct  device_node *node;      /* back-pointer to the device_node */
 197
 198         int     pci_ext_config_space;   /* for pci devices */
 199
 200 #ifdef CONFIG_EEH
 201         struct  pci_dev *pcidev;        /* back-pointer to the pci device */
 202         int     class_code;             /* pci device class */
 203         int     eeh_mode;               /* See eeh.h for possible EEH_MODEs */
 204         int     eeh_config_addr;
 205         int     eeh_pe_config_addr; /* new-style partition endpoint address */
 206         int     eeh_check_count;        /* # times driver ignored error */
 207         int     eeh_freeze_count;       /* # times this device froze up. */
 208         int     eeh_false_positives;    /* # times this device reported #ff's */
 209         u32     config_space[16];       /* saved PCI config space */
 210 #endif
 211 };
 212
 213 /* Get the pointer to a device_node's pci_dn */
 214 #define PCI_DN(dn)      ((struct pci_dn *) (dn)->data)
 215
 216 extern struct device_node *fetch_dev_dn(struct pci_dev *dev);
 217 extern void * update_dn_pci_info(struct device_node *dn, void *data);
 218
 219 /* Get a device_node from a pci_dev.  This code must be fast except
 220  * in the case where the sysdata is incorrect and needs to be fixed
 221  * up (this will only happen once).
 222  * In this case the sysdata will have been inherited from a PCI host
 223  * bridge or a PCI-PCI bridge further up the tree, so it will point
 224  * to a valid struct pci_dn, just not the one we want.
 225  */
 226 static inline struct device_node *pci_device_to_OF_node(struct pci_dev *dev)
 227 {
 228         struct device_node *dn = dev->sysdata;
 229         struct pci_dn *pdn = dn->data;
 230
 231         if (pdn && pdn->devfn == dev->devfn && pdn->busno == dev->bus->number)
 232                 return dn;      /* fast path.  sysdata is good */
 233         return fetch_dev_dn(dev);
 234 }
 235
 236 static inline int pci_device_from_OF_node(struct device_node *np,
 237                                           u8 *bus, u8 *devfn)
 238 {
 239         if (!PCI_DN(np))
 240                 return -ENODEV;
 241         *bus = PCI_DN(np)->busno;
 242         *devfn = PCI_DN(np)->devfn;
 243         return 0;
 244 }
 245
 246 static inline struct device_node *pci_bus_to_OF_node(struct pci_bus *bus)
 247 {
 248         if (bus->self)
 249                 return pci_device_to_OF_node(bus->self);
 250         else
 251                 return bus->sysdata; /* Must be root bus (PHB) */
 252 }
 253
 254 /** Find the bus corresponding to the indicated device node */
 255 extern struct pci_bus *pcibios_find_pci_bus(struct device_node *dn);
 256
 257 /** Remove all of the PCI devices under this bus */
 258 extern void pcibios_remove_pci_devices(struct pci_bus *bus);
 259
 260 /** Discover new pci devices under this bus, and add them */
 261 extern void pcibios_add_pci_devices(struct pci_bus *bus);
 262
 263 static inline struct pci_controller *pci_bus_to_host(const struct pci_bus *bus)
 264 {
 265         struct device_node *busdn = bus->sysdata;
 266
 267         BUG_ON(busdn == NULL);
 268         return PCI_DN(busdn)->phb;
 269 }
 270
 271
 272 extern void isa_bridge_find_early(struct pci_controller *hose);
 273
 274 static inline int isa_vaddr_is_ioport(void __iomem *address)
 275 {
 276         /* Check if address hits the reserved legacy IO range */
 277         unsigned long ea = (unsigned long)address;
 278         return ea >= ISA_IO_BASE && ea < ISA_IO_END;
 279 }
 280
 281 extern int pcibios_unmap_io_space(struct pci_bus *bus);
 282 extern int pcibios_map_io_space(struct pci_bus *bus);
 283
 284 #ifdef CONFIG_NUMA
 285 #define PHB_SET_NODE(PHB, NODE)         ((PHB)->node = (NODE))
 286 #else
 287 #define PHB_SET_NODE(PHB, NODE)         ((PHB)->node = -1)
 288 #endif
 289
 290 #endif  /* CONFIG_PPC64 */
 291
 292 /* Get the PCI host controller for an OF device */
 293 extern struct pci_controller *pci_find_hose_for_OF_device(
 294                         struct device_node* node);
 295
 296 /* Fill up host controller resources from the OF node */
 297 extern void pci_process_bridge_OF_ranges(struct pci_controller *hose,
 298                         struct device_node *dev, int primary);
 299
 300 /* Allocate & free a PCI host bridge structure */
 301 extern struct pci_controller *pcibios_alloc_controller(struct device_node *dev);
 302 extern void pcibios_free_controller(struct pci_controller *phb);
 303 extern void pcibios_setup_phb_resources(struct pci_controller *hose);
 304
 305 #ifdef CONFIG_PCI
 306 extern int pcibios_vaddr_is_ioport(void __iomem *address);
 307 #else
 308 static inline int pcibios_vaddr_is_ioport(void __iomem *address)
 309 {
 310         return 0;
 311 }
 312 #endif  /* CONFIG_PCI */
 313
 314 #endif  /* __KERNEL__ */
 315 #endif  /* _ASM_POWERPC_PCI_BRIDGE_H */