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| author | yongari <yongari@FreeBSD.org> | 2011-05-20 18:27:13 +0000 |
|---|---|---|
| committer | yongari <yongari@FreeBSD.org> | 2011-05-20 18:27:13 +0000 |
| commit | 8b344f95a5795eba597f19d5c6b1516c99bb2fa9 (patch) | |
| tree | 95aa95723222f84de830fe4a27ae4ac1d0ef7b2f /sys/dev | |
| parent | 10111562260f113db0ecd34895aa2e79e3fbb11e (diff) | |
| download | FreeBSD-src-8b344f95a5795eba597f19d5c6b1516c99bb2fa9.zip FreeBSD-src-8b344f95a5795eba597f19d5c6b1516c99bb2fa9.tar.gz | |
Datasheet says vge(4) controllers support DAC but it seems that's
not true on old PCI based controllers. DAC configuration is read
from EEPROM in device reset phase and driver can override DAC
configuration. However I guess there is an undocumented reason why
EEPROM configuration does not enable DAC so do not blindly override
DAC configuration. Recent PCIe based controllers are supposed to
support 64bit DMA so allow 64bit DMA only on PCIe based controllers.
PR: kern/157184
MFC after: 1 week
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/vge/if_vge.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/sys/dev/vge/if_vge.c b/sys/dev/vge/if_vge.c index 4549bb0..d9a58cc 100644 --- a/sys/dev/vge/if_vge.c +++ b/sys/dev/vge/if_vge.c @@ -685,7 +685,18 @@ vge_dma_alloc(struct vge_softc *sc) bus_addr_t lowaddr, tx_ring_end, rx_ring_end; int error, i; - lowaddr = BUS_SPACE_MAXADDR; + /* + * It seems old PCI controllers do not support DAC. DAC + * configuration can be enabled by accessing VGE_CHIPCFG3 + * register but honor EEPROM configuration instead of + * blindly overriding DAC configuration. PCIe based + * controllers are supposed to support 64bit DMA so enable + * 64bit DMA on these controllers. + */ + if ((sc->vge_flags & VGE_FLAG_PCIE) != 0) + lowaddr = BUS_SPACE_MAXADDR; + else + lowaddr = BUS_SPACE_MAXADDR_32BIT; again: /* Create parent ring tag. */ @@ -802,10 +813,14 @@ again: goto again; } + if ((sc->vge_flags & VGE_FLAG_PCIE) != 0) + lowaddr = VGE_BUF_DMA_MAXADDR; + else + lowaddr = BUS_SPACE_MAXADDR_32BIT; /* Create parent buffer tag. */ error = bus_dma_tag_create(bus_get_dma_tag(sc->vge_dev),/* parent */ 1, 0, /* algnmnt, boundary */ - VGE_BUF_DMA_MAXADDR, /* lowaddr */ + lowaddr, /* lowaddr */ BUS_SPACE_MAXADDR, /* highaddr */ NULL, NULL, /* filter, filterarg */ BUS_SPACE_MAXSIZE_32BIT, /* maxsize */ |
