include/linux/rio.h

   1 /*
   2  * RapidIO interconnect services
   3  * (RapidIO Interconnect Specification, http://www.rapidio.org)
   4  *
   5  * Copyright 2005 MontaVista Software, Inc.
   6  * Matt Porter <mporter@kernel.crashing.org>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #ifndef LINUX_RIO_H
  15 #define LINUX_RIO_H
  16
  17 #include <linux/types.h>
  18 #include <linux/ioport.h>
  19 #include <linux/list.h>
  20 #include <linux/errno.h>
  21 #include <linux/device.h>
  22 #include <linux/rio_regs.h>
  23 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
  24 #include <linux/dmaengine.h>
  25 #endif
  26
  27 #define RIO_NO_HOPCOUNT         -1
  28 #define RIO_INVALID_DESTID      0xffff
  29
  30 #define RIO_MAX_MPORTS          8
  31 #define RIO_MAX_MPORT_RESOURCES 16
  32 #define RIO_MAX_DEV_RESOURCES   16
  33 #define RIO_MAX_MPORT_NAME      40
  34
  35 #define RIO_GLOBAL_TABLE        0xff    /* Indicates access of a switch's
  36                                            global routing table if it
  37                                            has multiple (or per port)
  38                                            tables */
  39
  40 #define RIO_INVALID_ROUTE       0xff    /* Indicates that a route table
  41                                            entry is invalid (no route
  42                                            exists for the device ID) */
  43
  44 #define RIO_MAX_ROUTE_ENTRIES(size)     (size ? (1 << 16) : (1 << 8))
  45 #define RIO_ANY_DESTID(size)            (size ? 0xffff : 0xff)
  46
  47 #define RIO_MAX_MBOX            4
  48 #define RIO_MAX_MSG_SIZE        0x1000
  49
  50 /*
  51  * Error values that may be returned by RIO functions.
  52  */
  53 #define RIO_SUCCESSFUL                  0x00
  54 #define RIO_BAD_SIZE                    0x81
  55
  56 /*
  57  * For RIO devices, the region numbers are assigned this way:
  58  *
  59  *      0       RapidIO outbound doorbells
  60  *      1-15    RapidIO memory regions
  61  *
  62  * For RIO master ports, the region number are assigned this way:
  63  *
  64  *      0       RapidIO inbound doorbells
  65  *      1       RapidIO inbound mailboxes
  66  *      2       RapidIO outbound mailboxes
  67  */
  68 #define RIO_DOORBELL_RESOURCE   0
  69 #define RIO_INB_MBOX_RESOURCE   1
  70 #define RIO_OUTB_MBOX_RESOURCE  2
  71
  72 #define RIO_PW_MSG_SIZE         64
  73
  74 /*
  75  * A component tag value (stored in the component tag CSR) is used as device's
  76  * unique identifier assigned during enumeration. Besides being used for
  77  * identifying switches (which do not have device ID register), it also is used
  78  * by error management notification and therefore has to be assigned
  79  * to endpoints as well.
  80  */
  81 #define RIO_CTAG_RESRVD 0xfffe0000 /* Reserved */
  82 #define RIO_CTAG_UDEVID 0x0001ffff /* Unique device identifier */
  83
  84 extern struct bus_type rio_bus_type;
  85 extern struct device rio_bus;
  86
  87 struct rio_mport;
  88 struct rio_dev;
  89 union rio_pw_msg;
  90
  91 /**
  92  * struct rio_switch - RIO switch info
  93  * @node: Node in global list of switches
  94  * @switchid: Switch ID that is unique across a network
  95  * @route_table: Copy of switch routing table
  96  * @port_ok: Status of each port (one bit per port) - OK=1 or UNINIT=0
  97  * @add_entry: Callback for switch-specific route add function
  98  * @get_entry: Callback for switch-specific route get function
  99  * @clr_table: Callback for switch-specific clear route table function
 100  * @set_domain: Callback for switch-specific domain setting function
 101  * @get_domain: Callback for switch-specific domain get function
 102  * @em_init: Callback for switch-specific error management init function
 103  * @em_handle: Callback for switch-specific error management handler function
 104  * @sw_sysfs: Callback that initializes switch-specific sysfs attributes
 105  * @nextdev: Array of per-port pointers to the next attached device
 106  */
 107 struct rio_switch {
 108         struct list_head node;
 109         u16 switchid;
 110         u8 *route_table;
 111         u32 port_ok;
 112         int (*add_entry) (struct rio_mport *mport, u16 destid, u8 hopcount,
 113                           u16 table, u16 route_destid, u8 route_port);
 114         int (*get_entry) (struct rio_mport *mport, u16 destid, u8 hopcount,
 115                           u16 table, u16 route_destid, u8 *route_port);
 116         int (*clr_table) (struct rio_mport *mport, u16 destid, u8 hopcount,
 117                           u16 table);
 118         int (*set_domain) (struct rio_mport *mport, u16 destid, u8 hopcount,
 119                            u8 sw_domain);
 120         int (*get_domain) (struct rio_mport *mport, u16 destid, u8 hopcount,
 121                            u8 *sw_domain);
 122         int (*em_init) (struct rio_dev *dev);
 123         int (*em_handle) (struct rio_dev *dev, u8 swport);
 124         int (*sw_sysfs) (struct rio_dev *dev, int create);
 125         struct rio_dev *nextdev[0];
 126 };
 127
 128 /**
 129  * struct rio_dev - RIO device info
 130  * @global_list: Node in list of all RIO devices
 131  * @net_list: Node in list of RIO devices in a network
 132  * @net: Network this device is a part of
 133  * @did: Device ID
 134  * @vid: Vendor ID
 135  * @device_rev: Device revision
 136  * @asm_did: Assembly device ID
 137  * @asm_vid: Assembly vendor ID
 138  * @asm_rev: Assembly revision
 139  * @efptr: Extended feature pointer
 140  * @pef: Processing element features
 141  * @swpinfo: Switch port info
 142  * @src_ops: Source operation capabilities
 143  * @dst_ops: Destination operation capabilities
 144  * @comp_tag: RIO component tag
 145  * @phys_efptr: RIO device extended features pointer
 146  * @em_efptr: RIO Error Management features pointer
 147  * @dma_mask: Mask of bits of RIO address this device implements
 148  * @driver: Driver claiming this device
 149  * @dev: Device model device
 150  * @riores: RIO resources this device owns
 151  * @pwcback: port-write callback function for this device
 152  * @destid: Network destination ID (or associated destid for switch)
 153  * @hopcount: Hopcount to this device
 154  * @prev: Previous RIO device connected to the current one
 155  * @rswitch: struct rio_switch (if valid for this device)
 156  */
 157 struct rio_dev {
 158         struct list_head global_list;   /* node in list of all RIO devices */
 159         struct list_head net_list;      /* node in per net list */
 160         struct rio_net *net;    /* RIO net this device resides in */
 161         u16 did;
 162         u16 vid;
 163         u32 device_rev;
 164         u16 asm_did;
 165         u16 asm_vid;
 166         u16 asm_rev;
 167         u16 efptr;
 168         u32 pef;
 169         u32 swpinfo;
 170         u32 src_ops;
 171         u32 dst_ops;
 172         u32 comp_tag;
 173         u32 phys_efptr;
 174         u32 em_efptr;
 175         u64 dma_mask;
 176         struct rio_driver *driver;      /* RIO driver claiming this device */
 177         struct device dev;      /* LDM device structure */
 178         struct resource riores[RIO_MAX_DEV_RESOURCES];
 179         int (*pwcback) (struct rio_dev *rdev, union rio_pw_msg *msg, int step);
 180         u16 destid;
 181         u8 hopcount;
 182         struct rio_dev *prev;
 183         struct rio_switch rswitch[0];   /* RIO switch info */
 184 };
 185
 186 #define rio_dev_g(n) list_entry(n, struct rio_dev, global_list)
 187 #define rio_dev_f(n) list_entry(n, struct rio_dev, net_list)
 188 #define to_rio_dev(n) container_of(n, struct rio_dev, dev)
 189 #define sw_to_rio_dev(n) container_of(n, struct rio_dev, rswitch[0])
 190
 191 /**
 192  * struct rio_msg - RIO message event
 193  * @res: Mailbox resource
 194  * @mcback: Message event callback
 195  */
 196 struct rio_msg {
 197         struct resource *res;
 198         void (*mcback) (struct rio_mport * mport, void *dev_id, int mbox, int slot);
 199 };
 200
 201 /**
 202  * struct rio_dbell - RIO doorbell event
 203  * @node: Node in list of doorbell events
 204  * @res: Doorbell resource
 205  * @dinb: Doorbell event callback
 206  * @dev_id: Device specific pointer to pass on event
 207  */
 208 struct rio_dbell {
 209         struct list_head node;
 210         struct resource *res;
 211         void (*dinb) (struct rio_mport *mport, void *dev_id, u16 src, u16 dst, u16 info);
 212         void *dev_id;
 213 };
 214
 215 enum rio_phy_type {
 216         RIO_PHY_PARALLEL,
 217         RIO_PHY_SERIAL,
 218 };
 219
 220 /**
 221  * struct rio_mport - RIO master port info
 222  * @dbells: List of doorbell events
 223  * @node: Node in global list of master ports
 224  * @nnode: Node in network list of master ports
 225  * @iores: I/O mem resource that this master port interface owns
 226  * @riores: RIO resources that this master port interfaces owns
 227  * @inb_msg: RIO inbound message event descriptors
 228  * @outb_msg: RIO outbound message event descriptors
 229  * @host_deviceid: Host device ID associated with this master port
 230  * @ops: configuration space functions
 231  * @id: Port ID, unique among all ports
 232  * @index: Port index, unique among all port interfaces of the same type
 233  * @sys_size: RapidIO common transport system size
 234  * @phy_type: RapidIO phy type
 235  * @phys_efptr: RIO port extended features pointer
 236  * @name: Port name string
 237  * @priv: Master port private data
 238  * @dma: DMA device associated with mport
 239  * @nscan: RapidIO network enumeration/discovery operations
 240  */
 241 struct rio_mport {
 242         struct list_head dbells;        /* list of doorbell events */
 243         struct list_head node;  /* node in global list of ports */
 244         struct list_head nnode; /* node in net list of ports */
 245         struct resource iores;
 246         struct resource riores[RIO_MAX_MPORT_RESOURCES];
 247         struct rio_msg inb_msg[RIO_MAX_MBOX];
 248         struct rio_msg outb_msg[RIO_MAX_MBOX];
 249         int host_deviceid;      /* Host device ID */
 250         struct rio_ops *ops;    /* low-level architecture-dependent routines */
 251         unsigned char id;       /* port ID, unique among all ports */
 252         unsigned char index;    /* port index, unique among all port
 253                                    interfaces of the same type */
 254         unsigned int sys_size;  /* RapidIO common transport system size.
 255                                  * 0 - Small size. 256 devices.
 256                                  * 1 - Large size, 65536 devices.
 257                                  */
 258         enum rio_phy_type phy_type;     /* RapidIO phy type */
 259         u32 phys_efptr;
 260         unsigned char name[RIO_MAX_MPORT_NAME];
 261         void *priv;             /* Master port private data */
 262 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 263         struct dma_device       dma;
 264 #endif
 265         struct rio_scan *nscan;
 266 };
 267
 268 /*
 269  * Enumeration/discovery control flags
 270  */
 271 #define RIO_SCAN_ENUM_NO_WAIT   0x00000001 /* Do not wait for enum completed */
 272
 273 struct rio_id_table {
 274         u16 start;      /* logical minimal id */
 275         u32 max;        /* max number of IDs in table */
 276         spinlock_t lock;
 277         unsigned long *table;
 278 };
 279
 280 /**
 281  * struct rio_net - RIO network info
 282  * @node: Node in global list of RIO networks
 283  * @devices: List of devices in this network
 284  * @switches: List of switches in this netowrk
 285  * @mports: List of master ports accessing this network
 286  * @hport: Default port for accessing this network
 287  * @id: RIO network ID
 288  * @destid_table: destID allocation table
 289  */
 290 struct rio_net {
 291         struct list_head node;  /* node in list of networks */
 292         struct list_head devices;       /* list of devices in this net */
 293         struct list_head switches;      /* list of switches in this net */
 294         struct list_head mports;        /* list of ports accessing net */
 295         struct rio_mport *hport;        /* primary port for accessing net */
 296         unsigned char id;       /* RIO network ID */
 297         struct rio_id_table destid_table;  /* destID allocation table */
 298 };
 299
 300 /* Definitions used by switch sysfs initialization callback */
 301 #define RIO_SW_SYSFS_CREATE     1       /* Create switch attributes */
 302 #define RIO_SW_SYSFS_REMOVE     0       /* Remove switch attributes */
 303
 304 /* Low-level architecture-dependent routines */
 305
 306 /**
 307  * struct rio_ops - Low-level RIO configuration space operations
 308  * @lcread: Callback to perform local (master port) read of config space.
 309  * @lcwrite: Callback to perform local (master port) write of config space.
 310  * @cread: Callback to perform network read of config space.
 311  * @cwrite: Callback to perform network write of config space.
 312  * @dsend: Callback to send a doorbell message.
 313  * @pwenable: Callback to enable/disable port-write message handling.
 314  * @open_outb_mbox: Callback to initialize outbound mailbox.
 315  * @close_outb_mbox: Callback to shut down outbound mailbox.
 316  * @open_inb_mbox: Callback to initialize inbound mailbox.
 317  * @close_inb_mbox: Callback to shut down inbound mailbox.
 318  * @add_outb_message: Callback to add a message to an outbound mailbox queue.
 319  * @add_inb_buffer: Callback to add a buffer to an inbound mailbox queue.
 320  * @get_inb_message: Callback to get a message from an inbound mailbox queue.
 321  * @map_inb: Callback to map RapidIO address region into local memory space.
 322  * @unmap_inb: Callback to unmap RapidIO address region mapped with map_inb().
 323  */
 324 struct rio_ops {
 325         int (*lcread) (struct rio_mport *mport, int index, u32 offset, int len,
 326                         u32 *data);
 327         int (*lcwrite) (struct rio_mport *mport, int index, u32 offset, int len,
 328                         u32 data);
 329         int (*cread) (struct rio_mport *mport, int index, u16 destid,
 330                         u8 hopcount, u32 offset, int len, u32 *data);
 331         int (*cwrite) (struct rio_mport *mport, int index, u16 destid,
 332                         u8 hopcount, u32 offset, int len, u32 data);
 333         int (*dsend) (struct rio_mport *mport, int index, u16 destid, u16 data);
 334         int (*pwenable) (struct rio_mport *mport, int enable);
 335         int (*open_outb_mbox)(struct rio_mport *mport, void *dev_id,
 336                               int mbox, int entries);
 337         void (*close_outb_mbox)(struct rio_mport *mport, int mbox);
 338         int  (*open_inb_mbox)(struct rio_mport *mport, void *dev_id,
 339                              int mbox, int entries);
 340         void (*close_inb_mbox)(struct rio_mport *mport, int mbox);
 341         int  (*add_outb_message)(struct rio_mport *mport, struct rio_dev *rdev,
 342                                  int mbox, void *buffer, size_t len);
 343         int (*add_inb_buffer)(struct rio_mport *mport, int mbox, void *buf);
 344         void *(*get_inb_message)(struct rio_mport *mport, int mbox);
 345         int (*map_inb)(struct rio_mport *mport, dma_addr_t lstart,
 346                         u64 rstart, u32 size, u32 flags);
 347         void (*unmap_inb)(struct rio_mport *mport, dma_addr_t lstart);
 348 };
 349
 350 #define RIO_RESOURCE_MEM        0x00000100
 351 #define RIO_RESOURCE_DOORBELL   0x00000200
 352 #define RIO_RESOURCE_MAILBOX    0x00000400
 353
 354 #define RIO_RESOURCE_CACHEABLE  0x00010000
 355 #define RIO_RESOURCE_PCI        0x00020000
 356
 357 #define RIO_RESOURCE_BUSY       0x80000000
 358
 359 /**
 360  * struct rio_driver - RIO driver info
 361  * @node: Node in list of drivers
 362  * @name: RIO driver name
 363  * @id_table: RIO device ids to be associated with this driver
 364  * @probe: RIO device inserted
 365  * @remove: RIO device removed
 366  * @suspend: RIO device suspended
 367  * @resume: RIO device awakened
 368  * @enable_wake: RIO device enable wake event
 369  * @driver: LDM driver struct
 370  *
 371  * Provides info on a RIO device driver for insertion/removal and
 372  * power management purposes.
 373  */
 374 struct rio_driver {
 375         struct list_head node;
 376         char *name;
 377         const struct rio_device_id *id_table;
 378         int (*probe) (struct rio_dev * dev, const struct rio_device_id * id);
 379         void (*remove) (struct rio_dev * dev);
 380         int (*suspend) (struct rio_dev * dev, u32 state);
 381         int (*resume) (struct rio_dev * dev);
 382         int (*enable_wake) (struct rio_dev * dev, u32 state, int enable);
 383         struct device_driver driver;
 384 };
 385
 386 #define to_rio_driver(drv) container_of(drv,struct rio_driver, driver)
 387
 388 /**
 389  * struct rio_device_id - RIO device identifier
 390  * @did: RIO device ID
 391  * @vid: RIO vendor ID
 392  * @asm_did: RIO assembly device ID
 393  * @asm_vid: RIO assembly vendor ID
 394  *
 395  * Identifies a RIO device based on both the device/vendor IDs and
 396  * the assembly device/vendor IDs.
 397  */
 398 struct rio_device_id {
 399         u16 did, vid;
 400         u16 asm_did, asm_vid;
 401 };
 402
 403 /**
 404  * struct rio_switch_ops - Per-switch operations
 405  * @vid: RIO vendor ID
 406  * @did: RIO device ID
 407  * @init_hook: Callback that performs switch device initialization
 408  *
 409  * Defines the operations that are necessary to initialize/control
 410  * a particular RIO switch device.
 411  */
 412 struct rio_switch_ops {
 413         u16 vid, did;
 414         int (*init_hook) (struct rio_dev *rdev, int do_enum);
 415 };
 416
 417 union rio_pw_msg {
 418         struct {
 419                 u32 comptag;    /* Component Tag CSR */
 420                 u32 errdetect;  /* Port N Error Detect CSR */
 421                 u32 is_port;    /* Implementation specific + PortID */
 422                 u32 ltlerrdet;  /* LTL Error Detect CSR */
 423                 u32 padding[12];
 424         } em;
 425         u32 raw[RIO_PW_MSG_SIZE/sizeof(u32)];
 426 };
 427
 428 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 429
 430 /*
 431  * enum rio_write_type - RIO write transaction types used in DMA transfers
 432  *
 433  * Note: RapidIO specification defines write (NWRITE) and
 434  * write-with-response (NWRITE_R) data transfer operations.
 435  * Existing DMA controllers that service RapidIO may use one of these operations
 436  * for entire data transfer or their combination with only the last data packet
 437  * requires response.
 438  */
 439 enum rio_write_type {
 440         RDW_DEFAULT,            /* default method used by DMA driver */
 441         RDW_ALL_NWRITE,         /* all packets use NWRITE */
 442         RDW_ALL_NWRITE_R,       /* all packets use NWRITE_R */
 443         RDW_LAST_NWRITE_R,      /* last packet uses NWRITE_R, others - NWRITE */
 444 };
 445
 446 struct rio_dma_ext {
 447         u16 destid;
 448         u64 rio_addr;   /* low 64-bits of 66-bit RapidIO address */
 449         u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
 450         enum rio_write_type wr_type; /* preferred RIO write operation type */
 451 };
 452
 453 struct rio_dma_data {
 454         /* Local data (as scatterlist) */
 455         struct scatterlist      *sg;    /* I/O scatter list */
 456         unsigned int            sg_len; /* size of scatter list */
 457         /* Remote device address (flat buffer) */
 458         u64 rio_addr;   /* low 64-bits of 66-bit RapidIO address */
 459         u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
 460         enum rio_write_type wr_type; /* preferred RIO write operation type */
 461 };
 462
 463 static inline struct rio_mport *dma_to_mport(struct dma_device *ddev)
 464 {
 465         return container_of(ddev, struct rio_mport, dma);
 466 }
 467 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
 468
 469 /**
 470  * struct rio_scan - RIO enumeration and discovery operations
 471  * @enumerate: Callback to perform RapidIO fabric enumeration.
 472  * @discover: Callback to perform RapidIO fabric discovery.
 473  */
 474 struct rio_scan {
 475         int (*enumerate)(struct rio_mport *mport, u32 flags);
 476         int (*discover)(struct rio_mport *mport, u32 flags);
 477 };
 478
 479 /* Architecture and hardware-specific functions */
 480 extern int rio_register_mport(struct rio_mport *);
 481 extern int rio_open_inb_mbox(struct rio_mport *, void *, int, int);
 482 extern void rio_close_inb_mbox(struct rio_mport *, int);
 483 extern int rio_open_outb_mbox(struct rio_mport *, void *, int, int);
 484 extern void rio_close_outb_mbox(struct rio_mport *, int);
 485
 486 #endif                          /* LINUX_RIO_H */