ddi_regs_map_setup

- set up a mapping for a register address space

Synopsis

#include <sys/ddi.h>
#include <sys/sunddi.h>

int ddi_regs_map_setup(dev_info_t *dip, uint_t rnumber, caddr_t *addrp,
     offset_t offset, offset_t len, ddi_device_acc_attr_t *accattrp, 
     ddi_acc_handle_t *handlep);

Interface Level

Solaris DDI specific (Solaris DDI).

Parameters

dip

Pointer to the device's dev_info structure.

rnumber

Index number to the register address space set. A value of 0 indicates PCI configuration space, while a value of 1 indicates the real start of device register sets.

addrp

A platform-dependent value that, when added to an offset that is less than or equal to the len parameter (see below), is used for the dev_addr argument to the ddi_get, ddi_mem_get, and ddi_io_get/put routines.

offset

Offset into the register address space.

len

Length to be mapped.

accattrp

Pointer to a device access attribute structure of this mapping (see ddi_device_acc_attr(9S)).

handlep

Pointer to a data access handle.

Description

ddi_regs_map_setup() maps in the register set given by rnumber. The register number determines which register set is mapped if more than one exists.

offset specifies the starting location within the register space and len indicates the size of the area to be mapped. If len is non-zero, it overrides the length given in the register set description. If both len and offset are 0, the entire space is mapped. The base of the mapped register space is returned in addrp.

The device access attributes are specified in the location pointed by the accattrp argument (see ddi_device_acc_attr(9S) for details).

The data access handle is returned in handlep. handlep is opaque; drivers should not attempt to interpret its value. The handle is used by the system to encode information for subsequent data access function calls to maintain a consistent view between the host and the device.

Return Values

ddi_regs_map_setup() returns:

DDI_SUCCESS

Successfully set up the mapping for data access.

DDI_FAILURE

Invalid register number rnumber, offset offset, or length len.

DDI_ME_RNUMBER_RANGE

Invalid register number rnumber or unable to find reg property.

DDI_REGS_ACC_CONFLICT

Cannot enable the register mapping due to access conflicts with other enabled mappings.

Note that the return value DDI_ME_RNUMBER_RANGE is not supported on all platforms. Also, there is potential overlap between DDI_ME_RNUMBER_RANGE and DDI_FAILURE. Drivers should check for !=DDI_SUCCESS rather than checking for a specific failure value.

Context

ddi_regs_map_setup() must be called from user or kernel context.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

attributes(5), ddi_regs_map_free(9F), ddi_device_acc_attr(9S)

Writing Device Drivers