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Add some data found in TI's application note "SCPA035: PCI1510

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Implementation Guide" about default values.
This commit is contained in:
Warner Losh 2015-05-05 04:23:55 +00:00
parent 55d793dc6e
commit 531258ace4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=282447
1 changed files with 7 additions and 0 deletions
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7
sys/dev/pccbb/pccbb_pci.c
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@ -511,6 +511,13 @@ cbb_chipinit(struct cbb_softc *sc)
* register since changing them have subtle side effects
* for different variants of the card and are
* extremely difficult to exaustively test.
*
* Also, the TI 1510/1520 changed the default for the MFUNC
* register from 0x0 to 0x1000 to enable IRQSER by default.
* We want to be careful to avoid overriding that, and the
* below test will do that. Should this check prove to be
* too permissive, we should just check against 0 and 0x1000
* and not touch it otherwise.
*/
mux = pci_read_config(sc->dev, CBBR_MFUNC, 4);
sysctrl = pci_read_config(sc->dev, CBBR_SYSCTRL, 4);