[PATCH] cciss: disable DMA prefetch on P600

[linux-2.6-omap-h63xx.git] / drivers / block / cciss.c

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 4899ab27f781920d31a20bfe88f0724eae92cd41..a17223c43aebf9404f2712c764aa7a065125c286 100644 (file)
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3003,6 +3003,17 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
        }
 #endif
 
+       /* Disabling DMA prefetch for the P600
+        * An ASIC bug may result in a prefetch beyond
+        * physical memory.
+        */
+       if(board_id == 0x3225103C) {
+               __u32 dma_prefetch;
+               dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG);
+               dma_prefetch |= 0x8000;
+               writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG);
+       }
+
 #ifdef CCISS_DEBUG
        printk("Trying to put board into Simple mode\n");
 #endif                         /* CCISS_DEBUG */