[PATCH] PCI: DMA bursting advice

[linux-2.6-omap-h63xx.git] / include / asm-parisc / pci.h

diff --git a/include/asm-parisc/pci.h b/include/asm-parisc/pci.h
index 0763c2982fb085b2691893cc400d00f388119df7..f9f5bf90111d1e17037481c68a34cb56ba3146f5 100644 (file)
--- a/include/asm-parisc/pci.h
+++ b/include/asm-parisc/pci.h
@@ -230,6 +230,23 @@ extern inline void pcibios_register_hba(struct pci_hba_data *x)
 /* export the pci_ DMA API in terms of the dma_ one */
 #include <asm-generic/pci-dma-compat.h>
 
+static inline void pci_dma_burst_advice(struct pci_dev *pdev,
+                                       enum pci_dma_burst_strategy *strat,
+                                       unsigned long *strategy_parameter)
+{
+       unsigned long cacheline_size;
+       u8 byte;
+
+       pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);
+       if (byte == 0)
+               cacheline_size = 1024;
+       else
+               cacheline_size = (int) byte * 4;
+
+       *strat = PCI_DMA_BURST_MULTIPLE;
+       *strategy_parameter = cacheline_size;
+}
+
 extern void
 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
                         struct resource *res);