sys/sys/bus.h

   1 /*-
   2  * Copyright (c) 1997,1998 Doug Rabson
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/sys/bus.h,v 1.30.2.5 2004/03/17 17:54:25 njl Exp $
  27  * $DragonFly: src/sys/sys/bus.h,v 1.26 2007/09/12 07:59:31 hasso Exp $
  28  */
  29
  30 #ifndef _SYS_BUS_H_
  31 #define _SYS_BUS_H_
  32
  33 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  34
  35 #ifndef _SYS_TYPES_H_
  36 #include <sys/types.h>
  37 #endif
  38 #ifndef _SYS_QUEUE_H_
  39 #include <sys/queue.h>
  40 #endif
  41 #ifndef _SYS_KOBJ_H_
  42 #include <sys/kobj.h>
  43 #endif
  44 #ifdef _KERNEL
  45 #include <sys/serialize.h>
  46 #endif
  47 #ifndef _SYS_BUS_DMA_H_
  48 #include <sys/bus_dma.h>
  49 #endif
  50 #ifndef _SYS_BUS_RESOURCE_H_
  51 #include <sys/bus_resource.h>
  52 #endif
  53
  54 /*
  55  * Forward declarations
  56  */
  57 typedef struct device           *device_t;
  58 typedef struct kobj_class       driver_t;
  59 typedef struct devclass         *devclass_t;
  60 #define device_method_t         kobj_method_t
  61
  62 typedef void driver_intr_t(void*);
  63
  64 /*
  65  * Interrupt features mask.  Note that DragonFly no longer implements
  66  * INTR_TYPE_* flags.
  67  */
  68 #define INTR_FAST       0x0080
  69 #define INTR_EXCL       0x0100
  70 #define INTR_MPSAFE     0x0200
  71 #define INTR_NOENTROPY  0x0400
  72 #define INTR_NOPOLL     0x0800  /* interrupt cannot be polled (e.g. ata) */
  73
  74 #define INTR_NETSAFE    INTR_MPSAFE
  75
  76 enum intr_trigger {
  77     INTR_TRIGGER_CONFORM = 0,
  78     INTR_TRIGGER_EDGE = 1,
  79     INTR_TRIGGER_LEVEL = 2
  80 };
  81
  82 enum intr_polarity {
  83     INTR_POLARITY_CONFORM = 0,
  84     INTR_POLARITY_HIGH = 1,
  85     INTR_POLARITY_LOW = 2
  86 };
  87
  88 typedef int (*devop_t)(void);
  89
  90 typedef enum device_state {
  91     DS_NOTPRESENT,                      /* not probed or probe failed */
  92     DS_ALIVE,                           /* probe succeeded */
  93     DS_INPROGRESS,                      /* attach in progress */
  94     DS_ATTACHED,                        /* attach method called */
  95     DS_BUSY                             /* device is open */
  96 } device_state_t;
  97
  98 /*
  99  * Definitions for drivers which need to keep simple lists of resources
 100  * for their child devices.
 101  */
 102 struct  resource;
 103
 104 struct resource_list_entry {
 105     SLIST_ENTRY(resource_list_entry) link;
 106     int                 type;           /* type argument to alloc_resource */
 107     int                 rid;            /* resource identifier */
 108     struct resource     *res;           /* the real resource when allocated */
 109     u_long              start;          /* start of resource range */
 110     u_long              end;            /* end of resource range */
 111     u_long              count;          /* count within range */
 112 };
 113 SLIST_HEAD(resource_list, resource_list_entry);
 114
 115 #endif  /* _KERNEL || _KERNEL_STRUCTURES */
 116 #ifdef _KERNEL
 117
 118 /*
 119  * Initialise a resource list.
 120  */
 121 void    resource_list_init(struct resource_list *rl);
 122
 123 /*
 124  * Reclaim memory used by a resource list.
 125  */
 126 void    resource_list_free(struct resource_list *rl);
 127
 128 /*
 129  * Add a resource entry or modify an existing entry if one exists with
 130  * the same type and rid.
 131  */
 132 void    resource_list_add(struct resource_list *rl,
 133                           int type, int rid,
 134                           u_long start, u_long end, u_long count);
 135
 136 /*
 137  * Find a resource entry by type and rid.
 138  */
 139 struct resource_list_entry*
 140         resource_list_find(struct resource_list *rl,
 141                            int type, int rid);
 142
 143 /*
 144  * Delete a resource entry.
 145  */
 146 void    resource_list_delete(struct resource_list *rl,
 147                              int type, int rid);
 148
 149 /*
 150  * Implement BUS_ALLOC_RESOURCE by looking up a resource from the list
 151  * and passing the allocation up to the parent of bus. This assumes
 152  * that the first entry of device_get_ivars(child) is a struct
 153  * resource_list. This also handles 'passthrough' allocations where a
 154  * child is a remote descendant of bus by passing the allocation up to
 155  * the parent of bus.
 156  */
 157 struct resource *
 158         resource_list_alloc(struct resource_list *rl,
 159                             device_t bus, device_t child,
 160                             int type, int *rid,
 161                             u_long start, u_long end,
 162                             u_long count, u_int flags);
 163
 164 /*
 165  * Implement BUS_RELEASE_RESOURCE.
 166  */
 167 int     resource_list_release(struct resource_list *rl,
 168                               device_t bus, device_t child,
 169                               int type, int rid, struct resource *res);
 170
 171 /*
 172  * Print all resources of a specified type, for use in bus_print_child.
 173  * The name is printed if at least one resource of the given type is available.
 174  * The format ist used to print resource start and end.
 175  */
 176 int     resource_list_print_type(struct resource_list *rl,
 177                                  const char *name, int type,
 178                                  const char *format);
 179
 180 /*
 181  * The root bus, to which all top-level busses are attached.
 182  */
 183 extern device_t root_bus;
 184 void    root_bus_configure(void);
 185
 186 /*
 187  * Useful functions for implementing busses.
 188  */
 189
 190 int     bus_generic_activate_resource(device_t dev, device_t child, int type,
 191                                       int rid, struct resource *r);
 192 struct resource *
 193         bus_generic_alloc_resource(device_t bus, device_t child,
 194                                     int type, int *rid,
 195                                     u_long start, u_long end,
 196                                     u_long count, u_int flags);
 197 struct resource_list *
 198         bus_generic_get_resource_list (device_t, device_t);
 199
 200 int     bus_generic_config_intr(device_t, int, enum intr_trigger,
 201                                         enum intr_polarity);
 202 int     bus_generic_attach(device_t dev);
 203 int     bus_generic_child_present(device_t dev, device_t child);
 204 int     bus_generic_deactivate_resource(device_t dev, device_t child, int type,
 205                                         int rid, struct resource *r);
 206 int     bus_generic_detach(device_t dev);
 207 int     bus_generic_disable_intr(device_t dev, device_t child, void *cookie);
 208 void    bus_generic_driver_added(device_t dev, driver_t *driver);
 209 void    bus_generic_enable_intr(device_t dev, device_t child, void *cookie);
 210 int     bus_print_child_header(device_t dev, device_t child);
 211 int     bus_print_child_footer(device_t dev, device_t child);
 212 int     bus_generic_print_child(device_t dev, device_t child);
 213 int     bus_generic_identify(driver_t *driver, device_t parent);
 214 int     bus_generic_identify_sameunit(driver_t *driver, device_t parent);
 215 int     bus_generic_probe(device_t dev);
 216 int     bus_generic_probe_hack(device_t dev);
 217 device_t bus_generic_add_child(device_t, device_t, int, const char *, int);
 218 int     bus_generic_read_ivar(device_t dev, device_t child, int which,
 219                               uintptr_t *result);
 220 int     bus_generic_release_resource(device_t bus, device_t child,
 221                                      int type, int rid, struct resource *r);
 222 int     bus_generic_get_resource(device_t dev, device_t child, int type,
 223                                      int rid, u_long *startp, u_long *countp);
 224 int     bus_generic_set_resource(device_t dev, device_t child, int type,
 225                                      int rid, u_long start, u_long count);
 226 void    bus_generic_delete_resource(device_t dev, device_t child,
 227                                      int type, int rid);
 228 int     bus_generic_resume(device_t dev);
 229 int     bus_generic_setup_intr(device_t dev, device_t child,
 230                                struct resource *irq, int flags,
 231                                driver_intr_t *intr, void *arg,
 232                                void **cookiep, lwkt_serialize_t serializer);
 233 int     bus_generic_shutdown(device_t dev);
 234 int     bus_generic_suspend(device_t dev);
 235 int     bus_generic_teardown_intr(device_t dev, device_t child,
 236                                   struct resource *irq, void *cookie);
 237 int     bus_generic_write_ivar(device_t dev, device_t child, int which,
 238                                uintptr_t value);
 239
 240 struct resource *
 241         bus_generic_rl_alloc_resource (device_t, device_t, int, int *,
 242                                     u_long, u_long, u_long, u_int);
 243 void    bus_generic_rl_delete_resource (device_t, device_t, int, int);
 244 int     bus_generic_rl_get_resource (device_t, device_t, int, int, u_long *,
 245                                     u_long *);
 246 int     bus_generic_rl_set_resource (device_t, device_t, int, int, u_long,
 247                                     u_long);
 248 int     bus_generic_rl_release_resource (device_t, device_t, int, int,
 249                                     struct resource *);
 250
 251 /*
 252  * Wrapper functions for the BUS_*_RESOURCE methods to make client code
 253  * a little simpler.
 254  */
 255 struct resource_spec {
 256         int     type;
 257         int     rid;
 258         int     flags;
 259 };
 260
 261 int bus_alloc_resources(device_t dev, struct resource_spec *rs,
 262                         struct resource **res);
 263 void bus_release_resources(device_t dev, const struct resource_spec *rs,
 264                            struct resource **res);
 265
 266 struct  resource *bus_alloc_resource(device_t dev, int type, int *rid,
 267                                      u_long start, u_long end, u_long count,
 268                                      u_int flags);
 269 int     bus_activate_resource(device_t dev, int type, int rid,
 270                               struct resource *r);
 271 int     bus_deactivate_resource(device_t dev, int type, int rid,
 272                                 struct resource *r);
 273 int     bus_disable_intr(device_t dev, void *cookie);
 274 void    bus_enable_intr(device_t dev, void *cookie);
 275 int     bus_release_resource(device_t dev, int type, int rid,
 276                              struct resource *r);
 277 int     bus_setup_intr(device_t dev, struct resource *r, int flags,
 278                        driver_intr_t handler, void *arg,
 279                        void **cookiep, lwkt_serialize_t serializer);
 280 int     bus_teardown_intr(device_t dev, struct resource *r, void *cookie);
 281 int     bus_set_resource(device_t dev, int type, int rid,
 282                          u_long start, u_long count);
 283 int     bus_get_resource(device_t dev, int type, int rid,
 284                          u_long *startp, u_long *countp);
 285 u_long  bus_get_resource_start(device_t dev, int type, int rid);
 286 u_long  bus_get_resource_count(device_t dev, int type, int rid);
 287 void    bus_delete_resource(device_t dev, int type, int rid);
 288 int     bus_child_present(device_t child);
 289 int     bus_child_pnpinfo_str(device_t child, char *buf, size_t buflen);
 290 int     bus_child_location_str(device_t child, char *buf, size_t buflen);
 291
 292 static __inline struct resource *
 293 bus_alloc_resource_any(device_t dev, int type, int *rid, u_int flags)
 294 {
 295         return (bus_alloc_resource(dev, type, rid, 0ul, ~0ul, 1, flags));
 296 }
 297
 298 /*
 299  * Access functions for device.
 300  */
 301 device_t        device_add_child(device_t dev, const char *name, int unit);
 302 device_t        device_add_child_ordered(device_t dev, int order,
 303                                          const char *name, int unit);
 304 void    device_busy(device_t dev);
 305 int     device_delete_child(device_t dev, device_t child);
 306 int     device_detach(device_t dev);
 307 void    device_disable(device_t dev);
 308 void    device_enable(device_t dev);
 309 device_t        device_find_child(device_t dev, const char *classname,
 310                                   int unit);
 311 const char      *device_get_desc(device_t dev);
 312 devclass_t      device_get_devclass(device_t dev);
 313 driver_t        *device_get_driver(device_t dev);
 314 u_int32_t       device_get_flags(device_t dev);
 315 device_t        device_get_parent(device_t dev);
 316 int     device_get_children(device_t dev, device_t **listp, int *countp);
 317 void    *device_get_ivars(device_t dev);
 318 void    device_set_ivars(device_t dev, void *ivars);
 319 const   char *device_get_name(device_t dev);
 320 const   char *device_get_nameunit(device_t dev);
 321 void    *device_get_softc(device_t dev);
 322 device_state_t  device_get_state(device_t dev);
 323 int     device_get_unit(device_t dev);
 324 int     device_is_alive(device_t dev); /* did probe succeed? */
 325 int     device_is_attached(device_t dev);       /* did attach succeed? */
 326 int     device_is_enabled(device_t dev);
 327 int     device_is_quiet(device_t dev);
 328 int     device_print_prettyname(device_t dev);
 329 int     device_printf(device_t dev, const char *, ...) __printflike(2, 3);
 330 int     device_probe_and_attach(device_t dev);
 331 void    device_quiet(device_t dev);
 332 void    device_set_desc(device_t dev, const char* desc);
 333 void    device_set_desc_copy(device_t dev, const char* desc);
 334 int     device_set_devclass(device_t dev, const char *classname);
 335 int     device_set_driver(device_t dev, driver_t *driver);
 336 void    device_set_flags(device_t dev, u_int32_t flags);
 337 void    device_set_softc(device_t dev, void *softc);
 338 void    device_set_async_attach(device_t dev, int enable);
 339 int     device_set_unit(device_t dev, int unit);        /* XXX DONT USE XXX */
 340 int     device_shutdown(device_t dev);
 341 void    device_unbusy(device_t dev);
 342 void    device_verbose(device_t dev);
 343
 344 /*
 345  * Access functions for devclass.
 346  */
 347 int     devclass_add_driver(devclass_t dc, kobj_class_t driver);
 348 int     devclass_delete_driver(devclass_t dc, kobj_class_t driver);
 349 devclass_t      devclass_create(const char *classname);
 350 devclass_t      devclass_find(const char *classname);
 351 device_t        devclass_find_unit(const char *classname, int unit);
 352 kobj_class_t    devclass_find_driver(devclass_t dc, const char *classname);
 353 const char      *devclass_get_name(devclass_t dc);
 354 device_t        devclass_get_device(devclass_t dc, int unit);
 355 void    *devclass_get_softc(devclass_t dc, int unit);
 356 int     devclass_get_devices(devclass_t dc, device_t **listp, int *countp);
 357 int     devclass_get_maxunit(devclass_t dc);
 358 void    devclass_set_parent(devclass_t dc, devclass_t pdc);
 359 devclass_t      devclass_get_parent(devclass_t dc);
 360
 361 /*
 362  * Access functions for device resources.
 363  */
 364
 365 int     resource_int_value(const char *name, int unit, const char *resname,
 366                            int *result);
 367 int     resource_long_value(const char *name, int unit, const char *resname,
 368                             long *result);
 369 int     resource_string_value(const char *name, int unit, const char *resname,
 370                               char **result);
 371 int     resource_disabled(const char *name, int unit);
 372 int     resource_query_string(int i, const char *resname, const char *value);
 373 char    *resource_query_name(int i);
 374 int     resource_query_unit(int i);
 375 int     resource_locate(int i, const char *resname);
 376 int     resource_set_int(const char *name, int unit, const char *resname,
 377                          int value);
 378 int     resource_set_long(const char *name, int unit, const char *resname,
 379                           long value);
 380 int     resource_set_string(const char *name, int unit, const char *resname,
 381                             const char *value);
 382 int     resource_count(void);
 383
 384 /**
 385  * Some convenience defines for probe routines to return.  These are just
 386  * suggested values, and there's nothing magical about them.
 387  * BUS_PROBE_SPECIFIC is for devices that cannot be reprobed, and that no
 388  * possible other driver may exist (typically legacy drivers who don't fallow
 389  * all the rules, or special needs drivers).  BUS_PROBE_VENDOR is the
 390  * suggested value that vendor supplied drivers use.  This is for source or
 391  * binary drivers that are not yet integrated into the FreeBSD tree.  Its use
 392  * in the base OS is prohibited.  BUS_PROBE_DEFAULT is the normal return value
 393  * for drivers to use.  It is intended that nearly all of the drivers in the
 394  * tree should return this value.  BUS_PROBE_LOW_PRIORITY are for drivers that
 395  * have special requirements like when there are two drivers that support
 396  * overlapping series of hardware devices.  In this case the one that supports
 397  * the older part of the line would return this value, while the one that
 398  * supports the newer ones would return BUS_PROBE_DEFAULT.  BUS_PROBE_GENERIC
 399  * is for drivers that wish to have a generic form and a specialized form,
 400  * like is done with the pci bus and the acpi pci bus.  BUS_PROBE_HOOVER is
 401  * for those busses that implement a generic device place-holder for devices on
 402  * the bus that have no more specific driver for them (aka ugen).
 403  */
 404 #define BUS_PROBE_SPECIFIC      0       /* Only I can use this device */
 405 #if notyet
 406 #define BUS_PROBE_VENDOR        (-10)   /* Vendor supplied driver */
 407 #define BUS_PROBE_DEFAULT       (-20)   /* Base OS default driver */
 408 #define BUS_PROBE_LOW_PRIORITY  (-40)   /* Older, less desirable drivers */
 409 #define BUS_PROBE_GENERIC       (-100)  /* generic driver for dev */
 410 #define BUS_PROBE_HOOVER        (-500)  /* Generic dev for all devs on bus */
 411 #else
 412 #define BUS_PROBE_VENDOR        0
 413 #define BUS_PROBE_DEFAULT       0
 414 #define BUS_PROBE_LOW_PRIORITY  0
 415 #define BUS_PROBE_GENERIC       0
 416 #define BUS_PROBE_HOOVER        0
 417 #endif
 418
 419 /*
 420  * Shorthand for constructing method tables.
 421  */
 422 #define DEVMETHOD       KOBJMETHOD
 423
 424 /*
 425  * Some common device interfaces.
 426  */
 427 #include "device_if.h"
 428 #include "bus_if.h"
 429
 430 struct  module;
 431
 432 int     driver_module_handler(struct module *, int, void *);
 433
 434 /*
 435  * Module support for automatically adding drivers to busses.
 436  */
 437 struct driver_module_data {
 438         int             (*dmd_chainevh)(struct module *, int, void *);
 439         void            *dmd_chainarg;
 440         const char      *dmd_busname;
 441         kobj_class_t    dmd_driver;
 442         devclass_t      *dmd_devclass;
 443 };
 444
 445 #define DRIVER_MODULE(name, busname, driver, devclass, evh, arg)        \
 446                                                                         \
 447 static struct driver_module_data name##_##busname##_driver_mod = {      \
 448         evh, arg,                                                       \
 449         #busname,                                                       \
 450         (kobj_class_t) &driver,                                         \
 451         &devclass                                                       \
 452 };                                                                      \
 453                                                                         \
 454 static moduledata_t name##_##busname##_mod = {                          \
 455         #busname "/" #name,                                             \
 456         driver_module_handler,                                          \
 457         &name##_##busname##_driver_mod                                  \
 458 };                                                                      \
 459 DECLARE_MODULE(name##_##busname, name##_##busname##_mod,                \
 460                SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
 461
 462 #endif /* _KERNEL */
 463
 464 #endif /* !_SYS_BUS_H_ */