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stmmac: prevent dma init stuck in case of failures.

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Add a limit when perform the DMA reset procedure
so, in case of problems (i.e. PHY reset failed) the
Kernel won't hang on the stmmac DMA initialisation
blocking the Kernels execution.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Giuseppe CAVALLARO 2010-09-17 03:23:41 +00:00 committed by David S. Miller
parent ebbb293f8b
commit c629882ac7
2 changed files with 18 additions and 2 deletions
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10
drivers/net/stmmac/dwmac1000_dma.c
View file

@ -33,10 +33,18 @@ static int dwmac1000_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;
value = /* DMA_BUS_MODE_FB | */ DMA_BUS_MODE_4PBL |
((pbl << DMA_BUS_MODE_PBL_SHIFT) |

10
drivers/net/stmmac/dwmac100_dma.c
View file

@ -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),