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Enable 64bit DMA addressing for RTL810xE/RTL8168/RTL8111 PCIe

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controllers. Some old PCI controllers may work with DAC but it was
known to be buggy so 64bit DMA addressing is used only on PCIe
controllers.
This commit is contained in:
Pyun YongHyeon 2010-11-05 18:19:54 +00:00
parent 0108cce0a4
commit 66366ca4bf
1 changed files with 6 additions and 2 deletions
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8
sys/dev/re/if_re.c
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@ -934,6 +934,7 @@ re_dma_map_addr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
static int
re_allocmem(device_t dev, struct rl_softc *sc)
{
bus_addr_t lowaddr;
bus_size_t rx_list_size, tx_list_size;
int error;
int i;
@ -947,10 +948,13 @@ re_allocmem(device_t dev, struct rl_softc *sc)
* register should be set. However some RealTek chips are known
* to be buggy on DAC handling, therefore disable DAC by limiting
* DMA address space to 32bit. PCIe variants of RealTek chips
* may not have the limitation but I took safer path.
* may not have the limitation.
*/
lowaddr = BUS_SPACE_MAXADDR;
if ((sc->rl_flags & RL_FLAG_PCIE) == 0)
lowaddr = BUS_SPACE_MAXADDR_32BIT;
error = bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
lowaddr, BUS_SPACE_MAXADDR, NULL, NULL,
BUS_SPACE_MAXSIZE_32BIT, 0, BUS_SPACE_MAXSIZE_32BIT, 0,
NULL, NULL, &sc->rl_parent_tag);
if (error) {