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