From: Jon Nettleton jon@solid-run.com
This makes sure the DMA buffers are properly aligned for the hardware.
Signed-off-by: Jon Nettleton jon@solid-run.com Signed-off-by: Baruch Siach baruch@tkos.co.il --- drivers/net/mvneta.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/drivers/net/mvneta.c b/drivers/net/mvneta.c index 7036b517b445..fc16986a00d6 100644 --- a/drivers/net/mvneta.c +++ b/drivers/net/mvneta.c @@ -1025,6 +1025,9 @@ static int mvneta_rxq_init(struct mvneta_port *pp, if (rxq->descs == NULL) return -ENOMEM;
+ BUG_ON(rxq->descs != + PTR_ALIGN(rxq->descs, ARCH_DMA_MINALIGN)); + rxq->last_desc = rxq->size - 1;
/* Set Rx descriptors queue starting address */ @@ -1061,6 +1064,9 @@ static int mvneta_txq_init(struct mvneta_port *pp, if (txq->descs == NULL) return -ENOMEM;
+ BUG_ON(txq->descs != + PTR_ALIGN(txq->descs, ARCH_DMA_MINALIGN)); + txq->last_desc = txq->size - 1;
/* Set maximum bandwidth for enabled TXQs */ @@ -1694,18 +1700,20 @@ static int mvneta_probe(struct udevice *dev) * be active. Make this area DMA safe by disabling the D-cache */ if (!buffer_loc.tx_descs) { + u32 size; + /* Align buffer area for descs and rx_buffers to 1MiB */ bd_space = memalign(1 << MMU_SECTION_SHIFT, BD_SPACE); mmu_set_region_dcache_behaviour((phys_addr_t)bd_space, BD_SPACE, DCACHE_OFF); buffer_loc.tx_descs = (struct mvneta_tx_desc *)bd_space; + size = roundup(MVNETA_MAX_TXD * sizeof(struct mvneta_tx_desc), + ARCH_DMA_MINALIGN); buffer_loc.rx_descs = (struct mvneta_rx_desc *) - ((phys_addr_t)bd_space + - MVNETA_MAX_TXD * sizeof(struct mvneta_tx_desc)); - buffer_loc.rx_buffers = (phys_addr_t) - (bd_space + - MVNETA_MAX_TXD * sizeof(struct mvneta_tx_desc) + - MVNETA_MAX_RXD * sizeof(struct mvneta_rx_desc)); + ((phys_addr_t)bd_space + size); + size += roundup(MVNETA_MAX_RXD * sizeof(struct mvneta_rx_desc), + ARCH_DMA_MINALIGN); + buffer_loc.rx_buffers = (phys_addr_t)(bd_space + size); }
pp->base = (void __iomem *)pdata->iobase;