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  *      1       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 extern struct list_head rio_devices;    /* list of all devices */
  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  * @switchid: Switch ID that is unique across a network
  96  * @route_table: Copy of switch routing table
  97  * @port_ok: Status of each port (one bit per port) - OK=1 or UNINIT=0
  98  * @add_entry: Callback for switch-specific route add function
  99  * @get_entry: Callback for switch-specific route get function
 100  * @clr_table: Callback for switch-specific clear route table function
 101  * @set_domain: Callback for switch-specific domain setting function
 102  * @get_domain: Callback for switch-specific domain get function
 103  * @em_init: Callback for switch-specific error management init function
 104  * @em_handle: Callback for switch-specific error management handler function
 105  * @sw_sysfs: Callback that initializes switch-specific sysfs attributes
 106  * @nextdev: Array of per-port pointers to the next attached device
 107  */
 108 struct rio_switch {
 109         struct list_head node;
 110         u16 switchid;
 111         u8 *route_table;
 112         u32 port_ok;
 113         int (*add_entry) (struct rio_mport *mport, u16 destid, u8 hopcount,
 114                           u16 table, u16 route_destid, u8 route_port);
 115         int (*get_entry) (struct rio_mport *mport, u16 destid, u8 hopcount,
 116                           u16 table, u16 route_destid, u8 *route_port);
 117         int (*clr_table) (struct rio_mport *mport, u16 destid, u8 hopcount,
 118                           u16 table);
 119         int (*set_domain) (struct rio_mport *mport, u16 destid, u8 hopcount,
 120                            u8 sw_domain);
 121         int (*get_domain) (struct rio_mport *mport, u16 destid, u8 hopcount,
 122                            u8 *sw_domain);
 123         int (*em_init) (struct rio_dev *dev);
 124         int (*em_handle) (struct rio_dev *dev, u8 swport);
 125         int (*sw_sysfs) (struct rio_dev *dev, int create);
 126         struct rio_dev *nextdev[0];
 127 };
 128
 129 /**
 130  * struct rio_dev - RIO device info
 131  * @global_list: Node in list of all RIO devices
 132  * @net_list: Node in list of RIO devices in a network
 133  * @net: Network this device is a part of
 134  * @did: Device ID
 135  * @vid: Vendor ID
 136  * @device_rev: Device revision
 137  * @asm_did: Assembly device ID
 138  * @asm_vid: Assembly vendor ID
 139  * @asm_rev: Assembly revision
 140  * @efptr: Extended feature pointer
 141  * @pef: Processing element features
 142  * @swpinfo: Switch port info
 143  * @src_ops: Source operation capabilities
 144  * @dst_ops: Destination operation capabilities
 145  * @comp_tag: RIO component tag
 146  * @phys_efptr: RIO device extended features pointer
 147  * @em_efptr: RIO Error Management features pointer
 148  * @dma_mask: Mask of bits of RIO address this device implements
 149  * @driver: Driver claiming this device
 150  * @dev: Device model device
 151  * @riores: RIO resources this device owns
 152  * @pwcback: port-write callback function for this device
 153  * @destid: Network destination ID (or associated destid for switch)
 154  * @hopcount: Hopcount to this device
 155  * @prev: Previous RIO device connected to the current one
 156  * @rswitch: struct rio_switch (if valid for this device)
 157  */
 158 struct rio_dev {
 159         struct list_head global_list;   /* node in list of all RIO devices */
 160         struct list_head net_list;      /* node in per net list */
 161         struct rio_net *net;    /* RIO net this device resides in */
 162         u16 did;
 163         u16 vid;
 164         u32 device_rev;
 165         u16 asm_did;
 166         u16 asm_vid;
 167         u16 asm_rev;
 168         u16 efptr;
 169         u32 pef;
 170         u32 swpinfo;
 171         u32 src_ops;
 172         u32 dst_ops;
 173         u32 comp_tag;
 174         u32 phys_efptr;
 175         u32 em_efptr;
 176         u64 dma_mask;
 177         struct rio_driver *driver;      /* RIO driver claiming this device */
 178         struct device dev;      /* LDM device structure */
 179         struct resource riores[RIO_MAX_DEV_RESOURCES];
 180         int (*pwcback) (struct rio_dev *rdev, union rio_pw_msg *msg, int step);
 181         u16 destid;
 182         u8 hopcount;
 183         struct rio_dev *prev;
 184         struct rio_switch rswitch[0];   /* RIO switch info */
 185 };
 186
 187 #define rio_dev_g(n) list_entry(n, struct rio_dev, global_list)
 188 #define rio_dev_f(n) list_entry(n, struct rio_dev, net_list)
 189 #define to_rio_dev(n) container_of(n, struct rio_dev, dev)
 190 #define sw_to_rio_dev(n) container_of(n, struct rio_dev, rswitch[0])
 191
 192 /**
 193  * struct rio_msg - RIO message event
 194  * @res: Mailbox resource
 195  * @mcback: Message event callback
 196  */
 197 struct rio_msg {
 198         struct resource *res;
 199         void (*mcback) (struct rio_mport * mport, void *dev_id, int mbox, int slot);
 200 };
 201
 202 /**
 203  * struct rio_dbell - RIO doorbell event
 204  * @node: Node in list of doorbell events
 205  * @res: Doorbell resource
 206  * @dinb: Doorbell event callback
 207  * @dev_id: Device specific pointer to pass on event
 208  */
 209 struct rio_dbell {
 210         struct list_head node;
 211         struct resource *res;
 212         void (*dinb) (struct rio_mport *mport, void *dev_id, u16 src, u16 dst, u16 info);
 213         void *dev_id;
 214 };
 215
 216 enum rio_phy_type {
 217         RIO_PHY_PARALLEL,
 218         RIO_PHY_SERIAL,
 219 };
 220
 221 /**
 222  * struct rio_mport - RIO master port info
 223  * @dbells: List of doorbell events
 224  * @node: Node in global list of master ports
 225  * @nnode: Node in network list of master ports
 226  * @iores: I/O mem resource that this master port interface owns
 227  * @riores: RIO resources that this master port interfaces owns
 228  * @inb_msg: RIO inbound message event descriptors
 229  * @outb_msg: RIO outbound message event descriptors
 230  * @host_deviceid: Host device ID associated with this master port
 231  * @ops: configuration space functions
 232  * @id: Port ID, unique among all ports
 233  * @index: Port index, unique among all port interfaces of the same type
 234  * @sys_size: RapidIO common transport system size
 235  * @phy_type: RapidIO phy type
 236  * @phys_efptr: RIO port extended features pointer
 237  * @name: Port name string
 238  * @priv: Master port private data
 239  * @dma: DMA device associated with mport
 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 };
 266
 267 struct rio_id_table {
 268         u16 start;      /* logical minimal id */
 269         u16 next;       /* hint for find */
 270         u32 max;        /* max number of IDs in table */
 271         spinlock_t lock;
 272         unsigned long *table;
 273 };
 274
 275 /**
 276  * struct rio_net - RIO network info
 277  * @node: Node in global list of RIO networks
 278  * @devices: List of devices in this network
 279  * @mports: List of master ports accessing this network
 280  * @hport: Default port for accessing this network
 281  * @id: RIO network ID
 282  */
 283 struct rio_net {
 284         struct list_head node;  /* node in list of networks */
 285         struct list_head devices;       /* list of devices in this net */
 286         struct list_head switches;      /* list of switches in this net */
 287         struct list_head mports;        /* list of ports accessing net */
 288         struct rio_mport *hport;        /* primary port for accessing net */
 289         unsigned char id;       /* RIO network ID */
 290         struct rio_id_table destid_table;  /* destID allocation table */
 291 };
 292
 293 /* Definitions used by switch sysfs initialization callback */
 294 #define RIO_SW_SYSFS_CREATE     1       /* Create switch attributes */
 295 #define RIO_SW_SYSFS_REMOVE     0       /* Remove switch attributes */
 296
 297 /* Low-level architecture-dependent routines */
 298
 299 /**
 300  * struct rio_ops - Low-level RIO configuration space operations
 301  * @lcread: Callback to perform local (master port) read of config space.
 302  * @lcwrite: Callback to perform local (master port) write of config space.
 303  * @cread: Callback to perform network read of config space.
 304  * @cwrite: Callback to perform network write of config space.
 305  * @dsend: Callback to send a doorbell message.
 306  * @pwenable: Callback to enable/disable port-write message handling.
 307  * @open_outb_mbox: Callback to initialize outbound mailbox.
 308  * @close_outb_mbox: Callback to shut down outbound mailbox.
 309  * @open_inb_mbox: Callback to initialize inbound mailbox.
 310  * @close_inb_mbox: Callback to shut down inbound mailbox.
 311  * @add_outb_message: Callback to add a message to an outbound mailbox queue.
 312  * @add_inb_buffer: Callback to add a buffer to an inbound mailbox queue.
 313  * @get_inb_message: Callback to get a message from an inbound mailbox queue.
 314  * @map_inb: Callback to map RapidIO address region into local memory space.
 315  * @unmap_inb: Callback to unmap RapidIO address region mapped with map_inb().
 316  */
 317 struct rio_ops {
 318         int (*lcread) (struct rio_mport *mport, int index, u32 offset, int len,
 319                         u32 *data);
 320         int (*lcwrite) (struct rio_mport *mport, int index, u32 offset, int len,
 321                         u32 data);
 322         int (*cread) (struct rio_mport *mport, int index, u16 destid,
 323                         u8 hopcount, u32 offset, int len, u32 *data);
 324         int (*cwrite) (struct rio_mport *mport, int index, u16 destid,
 325                         u8 hopcount, u32 offset, int len, u32 data);
 326         int (*dsend) (struct rio_mport *mport, int index, u16 destid, u16 data);
 327         int (*pwenable) (struct rio_mport *mport, int enable);
 328         int (*open_outb_mbox)(struct rio_mport *mport, void *dev_id,
 329                               int mbox, int entries);
 330         void (*close_outb_mbox)(struct rio_mport *mport, int mbox);
 331         int  (*open_inb_mbox)(struct rio_mport *mport, void *dev_id,
 332                              int mbox, int entries);
 333         void (*close_inb_mbox)(struct rio_mport *mport, int mbox);
 334         int  (*add_outb_message)(struct rio_mport *mport, struct rio_dev *rdev,
 335                                  int mbox, void *buffer, size_t len);
 336         int (*add_inb_buffer)(struct rio_mport *mport, int mbox, void *buf);
 337         void *(*get_inb_message)(struct rio_mport *mport, int mbox);
 338         int (*map_inb)(struct rio_mport *mport, dma_addr_t lstart,
 339                         u64 rstart, u32 size, u32 flags);
 340         void (*unmap_inb)(struct rio_mport *mport, dma_addr_t lstart);
 341 };
 342
 343 #define RIO_RESOURCE_MEM        0x00000100
 344 #define RIO_RESOURCE_DOORBELL   0x00000200
 345 #define RIO_RESOURCE_MAILBOX    0x00000400
 346
 347 #define RIO_RESOURCE_CACHEABLE  0x00010000
 348 #define RIO_RESOURCE_PCI        0x00020000
 349
 350 #define RIO_RESOURCE_BUSY       0x80000000
 351
 352 /**
 353  * struct rio_driver - RIO driver info
 354  * @node: Node in list of drivers
 355  * @name: RIO driver name
 356  * @id_table: RIO device ids to be associated with this driver
 357  * @probe: RIO device inserted
 358  * @remove: RIO device removed
 359  * @suspend: RIO device suspended
 360  * @resume: RIO device awakened
 361  * @enable_wake: RIO device enable wake event
 362  * @driver: LDM driver struct
 363  *
 364  * Provides info on a RIO device driver for insertion/removal and
 365  * power management purposes.
 366  */
 367 struct rio_driver {
 368         struct list_head node;
 369         char *name;
 370         const struct rio_device_id *id_table;
 371         int (*probe) (struct rio_dev * dev, const struct rio_device_id * id);
 372         void (*remove) (struct rio_dev * dev);
 373         int (*suspend) (struct rio_dev * dev, u32 state);
 374         int (*resume) (struct rio_dev * dev);
 375         int (*enable_wake) (struct rio_dev * dev, u32 state, int enable);
 376         struct device_driver driver;
 377 };
 378
 379 #define to_rio_driver(drv) container_of(drv,struct rio_driver, driver)
 380
 381 /**
 382  * struct rio_device_id - RIO device identifier
 383  * @did: RIO device ID
 384  * @vid: RIO vendor ID
 385  * @asm_did: RIO assembly device ID
 386  * @asm_vid: RIO assembly vendor ID
 387  *
 388  * Identifies a RIO device based on both the device/vendor IDs and
 389  * the assembly device/vendor IDs.
 390  */
 391 struct rio_device_id {
 392         u16 did, vid;
 393         u16 asm_did, asm_vid;
 394 };
 395
 396 /**
 397  * struct rio_switch_ops - Per-switch operations
 398  * @vid: RIO vendor ID
 399  * @did: RIO device ID
 400  * @init_hook: Callback that performs switch device initialization
 401  *
 402  * Defines the operations that are necessary to initialize/control
 403  * a particular RIO switch device.
 404  */
 405 struct rio_switch_ops {
 406         u16 vid, did;
 407         int (*init_hook) (struct rio_dev *rdev, int do_enum);
 408 };
 409
 410 union rio_pw_msg {
 411         struct {
 412                 u32 comptag;    /* Component Tag CSR */
 413                 u32 errdetect;  /* Port N Error Detect CSR */
 414                 u32 is_port;    /* Implementation specific + PortID */
 415                 u32 ltlerrdet;  /* LTL Error Detect CSR */
 416                 u32 padding[12];
 417         } em;
 418         u32 raw[RIO_PW_MSG_SIZE/sizeof(u32)];
 419 };
 420
 421 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 422
 423 /*
 424  * enum rio_write_type - RIO write transaction types used in DMA transfers
 425  *
 426  * Note: RapidIO specification defines write (NWRITE) and
 427  * write-with-response (NWRITE_R) data transfer operations.
 428  * Existing DMA controllers that service RapidIO may use one of these operations
 429  * for entire data transfer or their combination with only the last data packet
 430  * requires response.
 431  */
 432 enum rio_write_type {
 433         RDW_DEFAULT,            /* default method used by DMA driver */
 434         RDW_ALL_NWRITE,         /* all packets use NWRITE */
 435         RDW_ALL_NWRITE_R,       /* all packets use NWRITE_R */
 436         RDW_LAST_NWRITE_R,      /* last packet uses NWRITE_R, others - NWRITE */
 437 };
 438
 439 struct rio_dma_ext {
 440         u16 destid;
 441         u64 rio_addr;   /* low 64-bits of 66-bit RapidIO address */
 442         u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
 443         enum rio_write_type wr_type; /* preferred RIO write operation type */
 444 };
 445
 446 struct rio_dma_data {
 447         /* Local data (as scatterlist) */
 448         struct scatterlist      *sg;    /* I/O scatter list */
 449         unsigned int            sg_len; /* size of scatter list */
 450         /* Remote device address (flat buffer) */
 451         u64 rio_addr;   /* low 64-bits of 66-bit RapidIO address */
 452         u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
 453         enum rio_write_type wr_type; /* preferred RIO write operation type */
 454 };
 455
 456 static inline struct rio_mport *dma_to_mport(struct dma_device *ddev)
 457 {
 458         return container_of(ddev, struct rio_mport, dma);
 459 }
 460 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
 461
 462 /* Architecture and hardware-specific functions */
 463 extern int rio_register_mport(struct rio_mport *);
 464 extern int rio_open_inb_mbox(struct rio_mport *, void *, int, int);
 465 extern void rio_close_inb_mbox(struct rio_mport *, int);
 466 extern int rio_open_outb_mbox(struct rio_mport *, void *, int, int);
 467 extern void rio_close_outb_mbox(struct rio_mport *, int);
 468
 469 #endif                          /* LINUX_RIO_H */