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Write zeros into the base/bounds register bars. We need to do this

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because NEWBUS (and I think some versions of Windows sometimes) writes
0xffffffff to these registers to disable them.  When they are
"disabled" like this, writing memory ranges to the pcic registers are
ignored and you will get "card (null) (null)" when you insert a call
otherwise.
This commit is contained in:
Warner Losh 2001-07-01 23:41:24 +00:00
parent 6428acdc74
commit c820d555c5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=79059
1 changed files with 16 additions and 0 deletions
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16
sys/pccard/pcic_pci.c
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@ -314,6 +314,22 @@ pcic_pci_cardbus_init(device_t dev)
/* Turn off legacy address */
pci_write_config(dev, CB_PCI_LEGACY16_IOADDR, 0, 2);
/*
* Write zeros into the remaining BARs. This seems to turn off
* the pci configuration of these things and make the cardbus
* bridge use the values for memory programmed into the pcic
* registers.
*/
pci_write_config(dev, CB_PCI_MEMBASE0, 0, 4);
pci_write_config(dev, CB_PCI_MEMLIMIT0, 0, 4);
pci_write_config(dev, CB_PCI_MEMBASE1, 0, 4);
pci_write_config(dev, CB_PCI_MEMLIMIT1, 0, 4);
pci_write_config(dev, CB_PCI_IOBASE0, 0, 4);
pci_write_config(dev, CB_PCI_IOLIMIT0, 0, 4);
pci_write_config(dev, CB_PCI_IOBASE1, 0, 4);
pci_write_config(dev, CB_PCI_IOLIMIT1, 0, 4);
return;
}