[PATCH] PCI: DMA bursting advice

[linux-2.6-omap-h63xx.git] / include / asm-ia64 / pci.h

diff --git a/include/asm-ia64/pci.h b/include/asm-ia64/pci.h
index a8314ee4e7d2542d304ccb52f6ba0408ef2c83b9..c9f1ab4e477d97cba6f66c8bc3fabeef07ee225d 100644 (file)
--- a/include/asm-ia64/pci.h
+++ b/include/asm-ia64/pci.h
@@ -82,6 +82,23 @@ extern int pcibios_prep_mwi (struct pci_dev *);
 #define sg_dma_len(sg)         ((sg)->dma_length)
 #define sg_dma_address(sg)     ((sg)->dma_address)
 
+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;
+}
+
 #define HAVE_PCI_MMAP
 extern int pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
                                enum pci_mmap_state mmap_state, int write_combine);