WRITE_ZSREG(9) Internal Functions WRITE_ZSREG(9)NAME
write_zsreg - Write to a Z8530 channel register
void write_zsreg(struct z8530_channel * c, u8 reg, u8 val);
The Z8530 channel
Value to write
Write a value to an indexed register. The caller must hold the lock to honour the irritating delay rules. We know about register 0 being
fast to access.
Assumes c->lock is held.
Alan Cox <email@example.com>
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 WRITE_ZSREG(9)
Check Out this Related Man Page
PCI(3) BSD Library Functions Manual PCI(3)NAME
pci -- library interface for PCI bus access
PCI Bus Access Library (libpci, -lpci)
pcibus_conf_read(int pcifd, u_int bus, u_int dev, u_int func, u_int reg, pcireg_t *valp);
pcibus_conf_write(int pcifd, u_int bus, u_int dev, u_int func, u_int reg, pcireg_t val);
pcidev_conf_read(int devfd, u_int reg, pcireg_t *valp);
pcidev_conf_write(int devfd, u_int reg, pcireg_t val);
pci_devinfo(pcireg_t id_reg, pcireg_t class_reg, char *devinfo, size_t len);
pci_conf_print(int pcifd, u_int bus, u_int dev, u_int func);
The pci library provides support for accessing the PCI bus by user programs.
These functions are available in the libpci library. Programs should be linked with -lpci.
CONFIGURATION SPACE FUNCTIONS
The following functions are used to access PCI configuration space:
Access the PCI configuration register reg on the device located at bus, dev, func, and place the result in *valp. pcifd must be an
open file descriptor to a PCI bus within the target PCI domain.
Write the value specified by val into the PCI configuration register reg on the device located at bus, dev, func. pcifd must be an
open file descriptor to a PCI bus within the target PCI domain.
Access the PCI configuration register reg on the device associated with the open file descriptor devfd and place the result in *valp.
Write the value specified by val into the PCI configuration register reg on the device associated with the open file descriptor devfd.
The following miscellaneous functions are available:
Return an ASCII description of the PCI vendor in the PCI ID register id_reg.
Return an ASCII description of the PCI vendor, PCI product, and PCI class specified by the PCI ID register id_reg and PCI class ID reg-
ister class_reg. The description is placed into the buffer pointed to by devinfo; the size of that buffer is specified in len.
Print the PCI configuration information for the device located at bus, dev, func. pcifd must be an open file descriptor to a PCI bus
within the target PCI domain.
The pcibus_conf_read(), pcibus_conf_write(), pcidev_conf_read(), and pcidev_conf_write() functions return 0 on success and -1 on failure.
The pci_findvendor() function returns NULL if the PCI vendor description cannot be found.
SEE ALSO pci(4)HISTORY
The pcibus_conf_read(), pcibus_conf_write(), pcidev_conf_read(), pcidev_conf_write(), pci_findvendor(), pci_devinfo(), and pci_conf_print()
functions first appeared in NetBSD 1.6.
BSD April 24, 2004 BSD
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