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TOMOYO Linux Cross Reference
Linux/include/linux/rio.h

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  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 class rio_mport_class;
 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 enum rio_device_state {
141         RIO_DEVICE_INITIALIZING,
142         RIO_DEVICE_RUNNING,
143         RIO_DEVICE_GONE,
144         RIO_DEVICE_SHUTDOWN,
145 };
146 
147 /**
148  * struct rio_dev - RIO device info
149  * @global_list: Node in list of all RIO devices
150  * @net_list: Node in list of RIO devices in a network
151  * @net: Network this device is a part of
152  * @do_enum: Enumeration flag
153  * @did: Device ID
154  * @vid: Vendor ID
155  * @device_rev: Device revision
156  * @asm_did: Assembly device ID
157  * @asm_vid: Assembly vendor ID
158  * @asm_rev: Assembly revision
159  * @efptr: Extended feature pointer
160  * @pef: Processing element features
161  * @swpinfo: Switch port info
162  * @src_ops: Source operation capabilities
163  * @dst_ops: Destination operation capabilities
164  * @comp_tag: RIO component tag
165  * @phys_efptr: RIO device extended features pointer
166  * @phys_rmap: LP-Serial Register Map Type (1 or 2)
167  * @em_efptr: RIO Error Management features pointer
168  * @dma_mask: Mask of bits of RIO address this device implements
169  * @driver: Driver claiming this device
170  * @dev: Device model device
171  * @riores: RIO resources this device owns
172  * @pwcback: port-write callback function for this device
173  * @destid: Network destination ID (or associated destid for switch)
174  * @hopcount: Hopcount to this device
175  * @prev: Previous RIO device connected to the current one
176  * @state: device state
177  * @rswitch: struct rio_switch (if valid for this device)
178  */
179 struct rio_dev {
180         struct list_head global_list;   /* node in list of all RIO devices */
181         struct list_head net_list;      /* node in per net list */
182         struct rio_net *net;    /* RIO net this device resides in */
183         bool do_enum;
184         u16 did;
185         u16 vid;
186         u32 device_rev;
187         u16 asm_did;
188         u16 asm_vid;
189         u16 asm_rev;
190         u16 efptr;
191         u32 pef;
192         u32 swpinfo;
193         u32 src_ops;
194         u32 dst_ops;
195         u32 comp_tag;
196         u32 phys_efptr;
197         u32 phys_rmap;
198         u32 em_efptr;
199         u64 dma_mask;
200         struct rio_driver *driver;      /* RIO driver claiming this device */
201         struct device dev;      /* LDM device structure */
202         struct resource riores[RIO_MAX_DEV_RESOURCES];
203         int (*pwcback) (struct rio_dev *rdev, union rio_pw_msg *msg, int step);
204         u16 destid;
205         u8 hopcount;
206         struct rio_dev *prev;
207         atomic_t state;
208         struct rio_switch rswitch[0];   /* RIO switch info */
209 };
210 
211 #define rio_dev_g(n) list_entry(n, struct rio_dev, global_list)
212 #define rio_dev_f(n) list_entry(n, struct rio_dev, net_list)
213 #define to_rio_dev(n) container_of(n, struct rio_dev, dev)
214 #define sw_to_rio_dev(n) container_of(n, struct rio_dev, rswitch[0])
215 #define to_rio_mport(n) container_of(n, struct rio_mport, dev)
216 #define to_rio_net(n) container_of(n, struct rio_net, dev)
217 
218 /**
219  * struct rio_msg - RIO message event
220  * @res: Mailbox resource
221  * @mcback: Message event callback
222  */
223 struct rio_msg {
224         struct resource *res;
225         void (*mcback) (struct rio_mport * mport, void *dev_id, int mbox, int slot);
226 };
227 
228 /**
229  * struct rio_dbell - RIO doorbell event
230  * @node: Node in list of doorbell events
231  * @res: Doorbell resource
232  * @dinb: Doorbell event callback
233  * @dev_id: Device specific pointer to pass on event
234  */
235 struct rio_dbell {
236         struct list_head node;
237         struct resource *res;
238         void (*dinb) (struct rio_mport *mport, void *dev_id, u16 src, u16 dst, u16 info);
239         void *dev_id;
240 };
241 
242 /**
243  * struct rio_mport - RIO master port info
244  * @dbells: List of doorbell events
245  * @pwrites: List of portwrite events
246  * @node: Node in global list of master ports
247  * @nnode: Node in network list of master ports
248  * @net: RIO net this mport is attached to
249  * @lock: lock to synchronize lists manipulations
250  * @iores: I/O mem resource that this master port interface owns
251  * @riores: RIO resources that this master port interfaces owns
252  * @inb_msg: RIO inbound message event descriptors
253  * @outb_msg: RIO outbound message event descriptors
254  * @host_deviceid: Host device ID associated with this master port
255  * @ops: configuration space functions
256  * @id: Port ID, unique among all ports
257  * @index: Port index, unique among all port interfaces of the same type
258  * @sys_size: RapidIO common transport system size
259  * @phys_efptr: RIO port extended features pointer
260  * @phys_rmap: LP-Serial EFB Register Mapping type (1 or 2).
261  * @name: Port name string
262  * @dev: device structure associated with an mport
263  * @priv: Master port private data
264  * @dma: DMA device associated with mport
265  * @nscan: RapidIO network enumeration/discovery operations
266  * @state: mport device state
267  * @pwe_refcnt: port-write enable ref counter to track enable/disable requests
268  */
269 struct rio_mport {
270         struct list_head dbells;        /* list of doorbell events */
271         struct list_head pwrites;       /* list of portwrite events */
272         struct list_head node;  /* node in global list of ports */
273         struct list_head nnode; /* node in net list of ports */
274         struct rio_net *net;    /* RIO net this mport is attached to */
275         struct mutex lock;
276         struct resource iores;
277         struct resource riores[RIO_MAX_MPORT_RESOURCES];
278         struct rio_msg inb_msg[RIO_MAX_MBOX];
279         struct rio_msg outb_msg[RIO_MAX_MBOX];
280         int host_deviceid;      /* Host device ID */
281         struct rio_ops *ops;    /* low-level architecture-dependent routines */
282         unsigned char id;       /* port ID, unique among all ports */
283         unsigned char index;    /* port index, unique among all port
284                                    interfaces of the same type */
285         unsigned int sys_size;  /* RapidIO common transport system size.
286                                  * 0 - Small size. 256 devices.
287                                  * 1 - Large size, 65536 devices.
288                                  */
289         u32 phys_efptr;
290         u32 phys_rmap;
291         unsigned char name[RIO_MAX_MPORT_NAME];
292         struct device dev;
293         void *priv;             /* Master port private data */
294 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
295         struct dma_device       dma;
296 #endif
297         struct rio_scan *nscan;
298         atomic_t state;
299         unsigned int pwe_refcnt;
300 };
301 
302 static inline int rio_mport_is_running(struct rio_mport *mport)
303 {
304         return atomic_read(&mport->state) == RIO_DEVICE_RUNNING;
305 }
306 
307 /*
308  * Enumeration/discovery control flags
309  */
310 #define RIO_SCAN_ENUM_NO_WAIT   0x00000001 /* Do not wait for enum completed */
311 
312 /**
313  * struct rio_net - RIO network info
314  * @node: Node in global list of RIO networks
315  * @devices: List of devices in this network
316  * @switches: List of switches in this network
317  * @mports: List of master ports accessing this network
318  * @hport: Default port for accessing this network
319  * @id: RIO network ID
320  * @dev: Device object
321  * @enum_data: private data specific to a network enumerator
322  * @release: enumerator-specific release callback
323  */
324 struct rio_net {
325         struct list_head node;  /* node in list of networks */
326         struct list_head devices;       /* list of devices in this net */
327         struct list_head switches;      /* list of switches in this net */
328         struct list_head mports;        /* list of ports accessing net */
329         struct rio_mport *hport;        /* primary port for accessing net */
330         unsigned char id;       /* RIO network ID */
331         struct device dev;
332         void *enum_data;        /* private data for enumerator of the network */
333         void (*release)(struct rio_net *net);
334 };
335 
336 enum rio_link_speed {
337         RIO_LINK_DOWN = 0, /* SRIO Link not initialized */
338         RIO_LINK_125 = 1, /* 1.25 GBaud  */
339         RIO_LINK_250 = 2, /* 2.5 GBaud   */
340         RIO_LINK_312 = 3, /* 3.125 GBaud */
341         RIO_LINK_500 = 4, /* 5.0 GBaud   */
342         RIO_LINK_625 = 5  /* 6.25 GBaud  */
343 };
344 
345 enum rio_link_width {
346         RIO_LINK_1X  = 0,
347         RIO_LINK_1XR = 1,
348         RIO_LINK_2X  = 3,
349         RIO_LINK_4X  = 2,
350         RIO_LINK_8X  = 4,
351         RIO_LINK_16X = 5
352 };
353 
354 enum rio_mport_flags {
355         RIO_MPORT_DMA    = (1 << 0), /* supports DMA data transfers */
356         RIO_MPORT_DMA_SG = (1 << 1), /* DMA supports HW SG mode */
357         RIO_MPORT_IBSG   = (1 << 2), /* inbound mapping supports SG */
358 };
359 
360 /**
361  * struct rio_mport_attr - RIO mport device attributes
362  * @flags: mport device capability flags
363  * @link_speed: SRIO link speed value (as defined by RapidIO specification)
364  * @link_width: SRIO link width value (as defined by RapidIO specification)
365  * @dma_max_sge: number of SG list entries that can be handled by DMA channel(s)
366  * @dma_max_size: max number of bytes in single DMA transfer (SG entry)
367  * @dma_align: alignment shift for DMA operations (as for other DMA operations)
368  */
369 struct rio_mport_attr {
370         int flags;
371         int link_speed;
372         int link_width;
373 
374         /* DMA capability info: valid only if RIO_MPORT_DMA flag is set */
375         int dma_max_sge;
376         int dma_max_size;
377         int dma_align;
378 };
379 
380 /* Low-level architecture-dependent routines */
381 
382 /**
383  * struct rio_ops - Low-level RIO configuration space operations
384  * @lcread: Callback to perform local (master port) read of config space.
385  * @lcwrite: Callback to perform local (master port) write of config space.
386  * @cread: Callback to perform network read of config space.
387  * @cwrite: Callback to perform network write of config space.
388  * @dsend: Callback to send a doorbell message.
389  * @pwenable: Callback to enable/disable port-write message handling.
390  * @open_outb_mbox: Callback to initialize outbound mailbox.
391  * @close_outb_mbox: Callback to shut down outbound mailbox.
392  * @open_inb_mbox: Callback to initialize inbound mailbox.
393  * @close_inb_mbox: Callback to shut down inbound mailbox.
394  * @add_outb_message: Callback to add a message to an outbound mailbox queue.
395  * @add_inb_buffer: Callback to add a buffer to an inbound mailbox queue.
396  * @get_inb_message: Callback to get a message from an inbound mailbox queue.
397  * @map_inb: Callback to map RapidIO address region into local memory space.
398  * @unmap_inb: Callback to unmap RapidIO address region mapped with map_inb().
399  * @query_mport: Callback to query mport device attributes.
400  * @map_outb: Callback to map outbound address region into local memory space.
401  * @unmap_outb: Callback to unmap outbound RapidIO address region.
402  */
403 struct rio_ops {
404         int (*lcread) (struct rio_mport *mport, int index, u32 offset, int len,
405                         u32 *data);
406         int (*lcwrite) (struct rio_mport *mport, int index, u32 offset, int len,
407                         u32 data);
408         int (*cread) (struct rio_mport *mport, int index, u16 destid,
409                         u8 hopcount, u32 offset, int len, u32 *data);
410         int (*cwrite) (struct rio_mport *mport, int index, u16 destid,
411                         u8 hopcount, u32 offset, int len, u32 data);
412         int (*dsend) (struct rio_mport *mport, int index, u16 destid, u16 data);
413         int (*pwenable) (struct rio_mport *mport, int enable);
414         int (*open_outb_mbox)(struct rio_mport *mport, void *dev_id,
415                               int mbox, int entries);
416         void (*close_outb_mbox)(struct rio_mport *mport, int mbox);
417         int  (*open_inb_mbox)(struct rio_mport *mport, void *dev_id,
418                              int mbox, int entries);
419         void (*close_inb_mbox)(struct rio_mport *mport, int mbox);
420         int  (*add_outb_message)(struct rio_mport *mport, struct rio_dev *rdev,
421                                  int mbox, void *buffer, size_t len);
422         int (*add_inb_buffer)(struct rio_mport *mport, int mbox, void *buf);
423         void *(*get_inb_message)(struct rio_mport *mport, int mbox);
424         int (*map_inb)(struct rio_mport *mport, dma_addr_t lstart,
425                         u64 rstart, u64 size, u32 flags);
426         void (*unmap_inb)(struct rio_mport *mport, dma_addr_t lstart);
427         int (*query_mport)(struct rio_mport *mport,
428                            struct rio_mport_attr *attr);
429         int (*map_outb)(struct rio_mport *mport, u16 destid, u64 rstart,
430                         u32 size, u32 flags, dma_addr_t *laddr);
431         void (*unmap_outb)(struct rio_mport *mport, u16 destid, u64 rstart);
432 };
433 
434 #define RIO_RESOURCE_MEM        0x00000100
435 #define RIO_RESOURCE_DOORBELL   0x00000200
436 #define RIO_RESOURCE_MAILBOX    0x00000400
437 
438 #define RIO_RESOURCE_CACHEABLE  0x00010000
439 #define RIO_RESOURCE_PCI        0x00020000
440 
441 #define RIO_RESOURCE_BUSY       0x80000000
442 
443 /**
444  * struct rio_driver - RIO driver info
445  * @node: Node in list of drivers
446  * @name: RIO driver name
447  * @id_table: RIO device ids to be associated with this driver
448  * @probe: RIO device inserted
449  * @remove: RIO device removed
450  * @shutdown: shutdown notification callback
451  * @suspend: RIO device suspended
452  * @resume: RIO device awakened
453  * @enable_wake: RIO device enable wake event
454  * @driver: LDM driver struct
455  *
456  * Provides info on a RIO device driver for insertion/removal and
457  * power management purposes.
458  */
459 struct rio_driver {
460         struct list_head node;
461         char *name;
462         const struct rio_device_id *id_table;
463         int (*probe) (struct rio_dev * dev, const struct rio_device_id * id);
464         void (*remove) (struct rio_dev * dev);
465         void (*shutdown)(struct rio_dev *dev);
466         int (*suspend) (struct rio_dev * dev, u32 state);
467         int (*resume) (struct rio_dev * dev);
468         int (*enable_wake) (struct rio_dev * dev, u32 state, int enable);
469         struct device_driver driver;
470 };
471 
472 #define to_rio_driver(drv) container_of(drv,struct rio_driver, driver)
473 
474 union rio_pw_msg {
475         struct {
476                 u32 comptag;    /* Component Tag CSR */
477                 u32 errdetect;  /* Port N Error Detect CSR */
478                 u32 is_port;    /* Implementation specific + PortID */
479                 u32 ltlerrdet;  /* LTL Error Detect CSR */
480                 u32 padding[12];
481         } em;
482         u32 raw[RIO_PW_MSG_SIZE/sizeof(u32)];
483 };
484 
485 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
486 
487 /*
488  * enum rio_write_type - RIO write transaction types used in DMA transfers
489  *
490  * Note: RapidIO specification defines write (NWRITE) and
491  * write-with-response (NWRITE_R) data transfer operations.
492  * Existing DMA controllers that service RapidIO may use one of these operations
493  * for entire data transfer or their combination with only the last data packet
494  * requires response.
495  */
496 enum rio_write_type {
497         RDW_DEFAULT,            /* default method used by DMA driver */
498         RDW_ALL_NWRITE,         /* all packets use NWRITE */
499         RDW_ALL_NWRITE_R,       /* all packets use NWRITE_R */
500         RDW_LAST_NWRITE_R,      /* last packet uses NWRITE_R, others - NWRITE */
501 };
502 
503 struct rio_dma_ext {
504         u16 destid;
505         u64 rio_addr;   /* low 64-bits of 66-bit RapidIO address */
506         u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
507         enum rio_write_type wr_type; /* preferred RIO write operation type */
508 };
509 
510 struct rio_dma_data {
511         /* Local data (as scatterlist) */
512         struct scatterlist      *sg;    /* I/O scatter list */
513         unsigned int            sg_len; /* size of scatter list */
514         /* Remote device address (flat buffer) */
515         u64 rio_addr;   /* low 64-bits of 66-bit RapidIO address */
516         u8  rio_addr_u;  /* upper 2-bits of 66-bit RapidIO address */
517         enum rio_write_type wr_type; /* preferred RIO write operation type */
518 };
519 
520 static inline struct rio_mport *dma_to_mport(struct dma_device *ddev)
521 {
522         return container_of(ddev, struct rio_mport, dma);
523 }
524 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
525 
526 /**
527  * struct rio_scan - RIO enumeration and discovery operations
528  * @owner: The module owner of this structure
529  * @enumerate: Callback to perform RapidIO fabric enumeration.
530  * @discover: Callback to perform RapidIO fabric discovery.
531  */
532 struct rio_scan {
533         struct module *owner;
534         int (*enumerate)(struct rio_mport *mport, u32 flags);
535         int (*discover)(struct rio_mport *mport, u32 flags);
536 };
537 
538 /**
539  * struct rio_scan_node - list node to register RapidIO enumeration and
540  * discovery methods with RapidIO core.
541  * @mport_id: ID of an mport (net) serviced by this enumerator
542  * @node: node in global list of registered enumerators
543  * @ops: RIO enumeration and discovery operations
544  */
545 struct rio_scan_node {
546         int mport_id;
547         struct list_head node;
548         struct rio_scan *ops;
549 };
550 
551 /* Architecture and hardware-specific functions */
552 extern int rio_mport_initialize(struct rio_mport *);
553 extern int rio_register_mport(struct rio_mport *);
554 extern int rio_unregister_mport(struct rio_mport *);
555 extern int rio_open_inb_mbox(struct rio_mport *, void *, int, int);
556 extern void rio_close_inb_mbox(struct rio_mport *, int);
557 extern int rio_open_outb_mbox(struct rio_mport *, void *, int, int);
558 extern void rio_close_outb_mbox(struct rio_mport *, int);
559 extern int rio_query_mport(struct rio_mport *port,
560                            struct rio_mport_attr *mport_attr);
561 
562 #endif                          /* LINUX_RIO_H */
563 

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