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Override some default values to work around various issues in the deep,

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dirty and murky past.

* Override the default cache line size to be something reasonable if
  it's set to 0.  Some NICs initialise with '0' (eg embedded ones)
  and there are comments in the driver stating that various OSes (eg
  older Linux ones) would incorrectly program things and 0 out this
  register.

* Just default to overriding the latency timer.  Every other driver
  does this.

* Use a default cache line size of 32 bytes.  It should be "reasonable
  enough".

Obtained from:	Linux ath9k, Atheros
This commit is contained in:
Adrian Chadd 2012-04-15 00:04:23 +00:00
parent 99006d44f8
commit b890549d41
1 changed files with 17 additions and 3 deletions
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20
sys/dev/ath/if_ath_pci.c
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@ -82,13 +82,27 @@ struct ath_pci_softc {
#define PCIR_RETRY_TIMEOUT 0x41
#define PCIR_CFG_PMCSR 0x48
#define DEFAULT_CACHESIZE 32
static void
ath_pci_setup(device_t dev)
{
#ifdef ATH_PCI_LATENCY_WAR
uint8_t cz;
/* XXX TODO: need to override the _system_ saved copies of this */
/*
* If the cache line size is 0, force it to a reasonable
* value.
*/
cz = pci_read_config(dev, PCIR_CACHELNSZ, 1);
if (cz == 0) {
pci_write_config(dev, PCIR_CACHELNSZ,
DEFAULT_CACHESIZE / 4, 1);
}
/* Override the system latency timer */
pci_write_config(dev, PCIR_LATTIMER, 0x80, 1);
#endif
pci_write_config(dev, PCIR_LATTIMER, 0xa8, 1);
/* If a PCI NIC, force wakeup */
#ifdef ATH_PCI_WAKEUP_WAR