diff options
Diffstat (limited to 'drivers/net/stmmac/dwmac100_dma.c')
| -rw-r--r-- | drivers/net/stmmac/dwmac100_dma.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/net/stmmac/dwmac100_dma.c b/drivers/net/stmmac/dwmac100_dma.c index c7279d2b..96aac93 100644 --- a/drivers/net/stmmac/dwmac100_dma.c +++ b/drivers/net/stmmac/dwmac100_dma.c @@ -35,10 +35,18 @@ static int dwmac100_dma_init(void __iomem *ioaddr, int pbl, u32 dma_tx, u32 dma_rx) { u32 value = readl(ioaddr + DMA_BUS_MODE); + int limit; + /* DMA SW reset */ value |= DMA_BUS_MODE_SFT_RESET; writel(value, ioaddr + DMA_BUS_MODE); - do {} while ((readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET)); + limit = 15000; + while (limit--) { + if (!(readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET)) + break; + } + if (limit < 0) + return -EBUSY; /* Enable Application Access by writing to DMA CSR0 */ writel(DMA_BUS_MODE_DEFAULT | (pbl << DMA_BUS_MODE_PBL_SHIFT), |
