SCO OpenServer

pci_write(D3oddi)

pci_write: pci_writebyte, pci_writeword, pci_writedword -- write data to PCI configuration space

Synopsis

#include <sys/pci.h>
   
int pci_writebyte(struct pci_devinfo infptr, unsigned short reg,
                 unsigned char data);
   
int pci_writeword(struct pci_devinfo infptr, unsigned short reg,
                 unsigned short data);
   
int pci_writedword(struct pci_devinfo infptr, unsigned short reg,
                  unsigned long data);

Description

The pci_writebyte( ), pci_writeword "" , pci_writedword( ) functions write a byte, word, or 32-bit word (double word) to a configuration space register.

Arguments

infptr): Pointer to a pci_devinfo(D4oddi) structure. to locate a device, and a register offset
reg: Register to which the data will be written.
data: Data to be written.

Return Values

A return value of 1 indicates success. 0 indicates failure. A failure could occur if the device was not found, or the register offset was invalid or misaligned.

Usage

The register offset must be aligned to correspond with the size of the data field being written. In other words, the register offset for pci_writeword( ) must be 2-byte aligned and the register offset for pci_writedword( ) must be 4-byte aligned. Incorrect alignment will result in a failure.

Context and synchronization

Initialization context

Hardware applicability

PCI bus

Version applicability

oddi: 3, 3mp, 4, 4mp, 5, 5mp, 6, 6mp

SVR5 DDI compatibility

DDI drivers access PCI configuration information through the resource manager database. Use the cm_getval(D3) function to access information supported by the parameters documented on the cm_params(D5) manual page and function such as cm_read_devconfig(D3) and cm_write_devconfig(D3) to access other configuration information. Note that DDI drivers cannot access all the PCI configuration information that SCO OpenServer 5 drivers can access.

References

pci(D4oddi), pci(HW),

pci_buspresent(D3oddi), pci_read(D3oddi), pci_search(D3oddi), pci_specialcycle(D3oddi)

``PCI'' in HDK Technical Reference