Unix/Linux Go Back    


NetBSD 6.1.5 - man page for isapnp_devmatch (netbsd section 9)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


ISAPNP(9)			  BSD Kernel Developer's Manual 			ISAPNP(9)

NAME
     ISAPNP, isapnp_devmatch, isapnp_config, isapnp_unconfig -- Plug 'n' Play ISA bus

SYNOPSIS
     #include <sys/bus.h>
     #include <dev/isa/isareg.h>
     #include <dev/isa/isavar.h>
     #include <dev/isapnp/isapnpreg.h>
     #include <dev/isapnp/isapnpvar.h>
     #include <dev/isapnp/isapnpdevs.h>

     int
     isapnp_devmatch(const struct isapnp_attach_args *ipa, const struct isapnp_devinfo *dinfo,
	 int *variant);

     int
     isapnp_config(bus_space_tag_t iot, bus_space_tag_t memt, struct isapnp_attach_args *ipa);

     void
     isapnp_unconfig(bus_space_tag_t iot, bus_space_tag_t memt, struct isapnp_attach_args *ipa);

DESCRIPTION
     The machine-independent ISAPNP subsystem provides support for ISAPNP devices.  ISAPNP
     devices were developed to support "plug and play" connection on the ISA bus.  In all other
     aspects, the ISAPNP bus is same as the ISA bus (see isa(9)).

     Devices on the ISAPNP bus are uniquely identified by a 7-character string.  Resources, such
     as I/O address space and interrupts, should be allocated to the devices by the machine
     firmware.	On some machine the firmware seems doesn't work correctly and NetBSD will attempt
     to allocate resources as necessary.

DATA TYPES
     Drivers attached to the ISAPNP bus will make use of the following data types:

     struct isapnp_matchinfo
	      NetBSD kernel contains a database of known ISAPNP devices.  Each entry in the data-
	      base has a struct isapnp_matchinfo.  It contains the following members:

		      const char *name; 	      /* device id string */
		      int variant;		      /* variant flag */

     struct isapnp_devinfo
	      Defines the devices supported by a driver.  It contains pointer to an array of sup-
	      ported struct isapnp_matchinfo structures and a pointer to another array of compat-
	      ibility devices.	It contains the following members:

		      struct isapnp_matchinfo *devlogic;
		      int nlogic;
		      struct isapnp_matchinfo *devcompat;
		      int ncompat;

     struct isapnp_region
	      Describes ISAPNP bus-space regions.  It contains the following members:

		      bus_space_handle_t h;
		      uint32_t base;
		      uint32_t length;

     struct isapnp_pin
	      Describes the wiring of interrupts and DMA pins from the ISAPNP bus onto the host
	      processor.  It contains the following members:

		      uint8_t  num;
		      uint8_t  flags:4;
		      uint8_t  type:4;
		      uint16_t bits;

     struct isapnp_attach_args
	      A structure used to inform the driver of the device properties.  It contains the
	      following members:

		      bus_space_tag_t ipa_iot;	      /* isa i/o space tag */
		      bus_space_tag_t ipa_memt;       /* isa mem space tag */
		      bus_dma_tag_t   ipa_dmat;       /* isa dma tag */
		      isa_chipset_tag_t       ipa_ic;
		      struct isapnp_region    ipa_io[ISAPNP_NUM_IO];
		      struct isapnp_region    ipa_mem[ISAPNP_NUM_MEM];
		      struct isapnp_region    ipa_mem32[ISAPNP_NUM_MEM32];
		      struct isapnp_pin       ipa_irq[ISAPNP_NUM_IRQ];
		      struct isapnp_pin       ipa_drq[ISAPNP_NUM_DRQ];

FUNCTIONS
     isapnp_devmatch(ipa, dinfo, variant)
	      Matches the device described by the attachment ipa with the device-match informa-
	      tion in dinfo.  If the device is matched, isapnp_devmatch() returns a non-zero
	      value and variant is the flag describing the device variant.  isapnp_devmatch()
	      returns zero if the device is not found.

     isapnp_config(iot, memt, ipa)
	      Allocate device resources specified by ipa.  The device is mapped into the I/O and
	      memory bus spaces specified by bus-space tags iot and memt respectively.	The
	      ipa_io, ipa_mem, ipa_mem32, ipa_irq, and ipa_drq members of ipa are updated to
	      reflect the allocated and mapped resources.  isapnp_config() returns zero on suc-
	      cess and non-zero on error.

     isapnp_unconfig(iot, memt, ipa)
	      Free the resources allocated by isapnp_config().

AUTOCONFIGURATION
     During autoconfiguration, an ISAPNP driver will receive a pointer to struct
     isapnp_attach_args describing the device attached to the ISAPNP bus.  Drivers match the
     device using ispnp_devmatch().

     During the driver attach step, driver should initially allocate and map resources using
     isapnp_config().  The I/O (memory) bus-space resources can be accessed using the bus-space
     tag ipa_iot (ipa_memt) and the bus-space handle ipa_io[0].h (ipa_mem[0].h) members of ipa.

     Interrupts should be established using isa_intr_establish() (see isa(9)) with the IRQ speci-
     fied by the ipa_irq[0].num member of ipa.	Similarly, the standard isa(9) DMA interface
     should be used with the ipa_drq[0].num member of ipa.

DMA SUPPORT
     Extensive DMA facilities are provided through the isa(9) DMA facilities.

CODE REFERENCES
     The ISAPNP subsystem itself is implemented within the file sys/dev/isapnp/isapnp.c.  The
     database of the known devices exists within the file sys/dev/isapnp/isapnpdevs.c and is gen-
     erated automatically from the file sys/dev/isapnp/isapnpdevs.  New devices should be added
     to this file.  The database can be regenerated using the Makefile
     sys/dev/isapnp/Makefile.isapnpdevs.

SEE ALSO
     isa(4), isapnp(4), pnpbios(4), autoconf(9), bus_dma(9), bus_space(9), driver(9), isa(9)

     Plug and Play ISA Specification V1.0a, May 5 1994.

HISTORY
     The machine-independent ISAPNP subsystem appear in NetBSD 1.3.

BSD					  June 19, 2001 				      BSD
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 10:08 AM.