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Added "classical" ISA example.

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This commit is contained in:
Michael Brown 2005-04-15 16:28:14 +00:00
parent 897eeee4ee
commit f61fa0dc64
1 changed files with 63 additions and 0 deletions
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63
src/drivers/net/skel.c
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@ -177,6 +177,11 @@ static struct nic_operations skel_operations = {
* example, most PCI devices will only need the PCI probing section;
* ISAPnP, EISA, etc. can all be deleted.
*
* Some devices will need custom bus logic. The ISA 3c509 is a good
* example of this; it has a contention-resolution mechanism that is
* similar to ISAPnP, but not close enough to use the generic ISAPnP
* code. Look at 3c509.c to see how it works.
*
**************************************************************************
*/
@ -324,3 +329,61 @@ BOOT_DRIVER ( "SKEL/MCA", find_mca_boot_device,
ISA_ROM ( "skel-mca", "Skeleton MCA Adapter" );
/**************************************************************************
* ISA PROBE - Look for an adapter
*
* The "classical" ISA probe is split into two stages: trying a list
* of I/O addresses to see if there's anything listening, and then
* using that I/O address to fill in the information in the nic
* structure.
*
* The list of probe addresses defined in skel_isa_probe_addrs[] will
* be passed to skel_isa_probe_addr(). If skel_isa_probe_addr()
* returns true, a struct isa_device will be created with isa->ioaddr
* set to the working I/O address, and skel_isa_probe() will be
* called.
*
* There is a standard mechanism for overriding the probe address list
* using ISA_PROBE_ADDRS. Do not implement any custom code to
* override the probe address list.
*
**************************************************************************
*/
static int skel_isa_probe_addr ( uint16_t ioaddr __unused ) {
return 0;
}
static int skel_isa_probe ( struct dev *dev, struct isa_device *isa ) {
struct nic *nic = nic_device ( dev );
nic->ioaddr = isa->ioaddr;
nic->irqno = 0;
/* Test for physical presence of NIC */
/*
if ( ! my_tests ) {
DBG ( "Could not find NIC: my explanation\n" );
return 0;
}
*/
/* point to NIC specific routines */
nic->nic_op = &skel_operations;
return 1;
}
static struct isa_probe_addr skel_isa_probe_addrs[] = {
/*
{ 0x200 }, { 0x240 },
*/
};
static struct isa_driver skel_isa_driver =
ISA_DRIVER ( "SKEL/ISA", skel_isa_probe_addrs, skel_isa_probe_addr,
ISA_VENDOR('S','K','L'), 0x0000 );
BOOT_DRIVER ( "SKEL/ISA", find_isa_boot_device,
skel_isa_driver, skel_isa_probe );
ISA_ROM ( "skel-isa", "Skeleton ISA Adapter" );