NAME
sysbus, isa, eisa − device tree properties for ISA and EISA bus device drivers
DESCRIPTION
Solaris (Intel
Platform Edition) supports the ISA and EISA
buses as the system bus. Drivers for devices on these buses
use the device tree built by the booting system to retrieve
the necessary system resources used by the driver. These
resources include device I/O port addresses, any interrupt
capabilities
that the device may have, any DMA channels it may require,
and any memory-mapped addresses it may occupy.
Configuration files for ISA and EISA device drivers are only necessary to describe properties used by a particular driver that are not part of the standard properties found in the device tree. See driver.conf(4) for further details of configuration file syntax.
The ISA
and EISA nexus drivers all belong to class
sysbus. All bus drivers of class sysbus
recognize the following properties:
interrupts
An arbitrary-length array where each element of the array represents a hardware interrupt (IRQ) that is used by the device. In general, this array only has one entry unless a particular device uses more than one IRQ.
Solaris
defaults all ISA and EISA interrupts to IPL 5.
This interrupt priority may be overridden by placing an
interrupt-priorities property in a .conf file for the
driver. Each entry in the array of integers for the
interrupt-priorities property is matched one-to-one
with the elements in the interrupts property to
specify the IPL value that will be used by the system
for this interrupt in this driver. This is the priority that
this device’s interrupt handler will receive relative
to the interrupt handlers of other drivers.
The priority is an integer from 1 to 16.
Generally, disks are assigned a priority of 5, while
mice and printers are lower, and serial communication
devices are higher, typically 7. 10 is
reserved by the system and must not be used. Priorities
11 and greater are high level priorities and are
generally not recommended (see
ddi_intr_hilevel(9F)).
The driver can refer to the elements of this array by index using ddi_add_intr(9F). The index into the array is passed as the inumber argument of ddi_add_intr().
Only devices that generate interrupts will have an interrupts property.
|
reg |
An arbitrary-length array where each element of the array consists of a 3-tuple of integers. Each array element describes a contiguous memory address range associated with the device on the bus. |
The first integer of the tuple specifies the memory type, 0 specifies a memory range and 1 specifies an I/O range. The second integer specifies the base address of the memory range. The third integer of each 3-tuple specifies the size, in bytes, of the mappable region.
The driver can refer to the elements of this array by index, and construct kernel mappings to these addresses using ddi_map_regs(9F). The index into the array is passed as the rnumber argument of ddi_map_regs().
All sysbus devices will have reg properties. The first tuple of this property is used to construct the address part of the device name under /devices. In the case of Plug and Play ISA devices, the first tuple is a special tuple that does not denote a memory range, but is used by the system only to create the address part of the device name. This special tuple can be recognized by determining if the top bit of the first integer is set to a one.
The order of the tuples in the reg property is determined by the boot system probe code and depends on the characteristics of each particular device. However, the reg property will maintain the same order of entries from system boot to system boot. The recommended way to determine the reg property for a particular device is to use the prtconf(1M) command after installing the particular device. The output of the prtconf command can be examined to determine the reg property for any installed device.
You can use the ddi_get* and ddi_put* family of functions to access register space from a high-level interrupt context.
dma-channels
A list of integers that specifies the DMA channels used by this device. Only devices that use DMA channels will have a dma-channels property.
It is recommended that drivers for devices connected to the system bus recognize the following standard property names:
|
slot |
The number of the slot containing the device, if known. (Only for EISA devices). |
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
SEE ALSO
prtconf(1M), driver.conf(4), scsi(4), attributes(5), ddi_add_intr(9F), ddi_intr_hilevel(9F), ddi_map_regs(9F), ddi_prop_op(9F)
Writing Device Drivers