Hi thomas,
>It can be a driver problem, but as you haven't posted your code source,
>nobody is able to tell. Are you doing the correct things at module
>exit ?
These are some parts of my code.
within probe funcion
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{
gdma.dma_buf = (char*)kmalloc( GAIAPCI_DMABUF_SIZE, GFP_KERNEL|__GFP_DMA );
if( gdma.dma_buf==0 ){
printk( KERN_ALERT "@ ERROR - unable to allocate memory\n" );
ret=-1;
}
else{
/* clear RM7965 interrupt */
gaiapci_int_clear( PCIDT_RM7965INTCLR );
/* unmask RM7965 interrupt */
gaiapci_int_enable( PCIDT_RM7965INTMSK );
ret = 0;
}
}
--------------------------------------------------------------------------------------------------------------------------------------
within remove function
--------------------------------------------------------------------------------------------------------------------------------------
{
kfree(gdma.dma_buf);
gdma.dma_buf = 0;
free_irq(irq_no, irq_id);
if( pciVmOffset ){
iounmap((void*)(pciVmOffset & PAGE_MASK));
}
pci_release_region(dev, 0);
pci_disable_device(dev);
gaiapci_unregister_chr();
}
write function
--------------------------------------------------------------------------------------------------------------------------------------
{
gdma.dma_dir = DMA_TO_DEVICE;
bus_addr = dma_map_single( &gdev.pdev->dev, (void*)gdma.dma_buf,
GAIAPCI_DMABUF_SIZE, gdma.dma_dir );
gdma.dma_bus = bus_addr;
/* set data size */
/* set address */
/* enable dma interrupt */
/* dma start command */
}
--------------------------------------------------------------------------------------------------------------------------------------
interrupt routine
--------------------------------------------------------------------------------------------------------------------------------------
{
gaiapci_int_clear( PCIDT_MDMAENDCLR );
gaiapci_int_mask( PCIDT_MDMAENDMSK );
dma_unmap_single(&gdev.pdev->dev, gdma.dma_bus, GAIAPCI_DMABUF_SIZE,
gdma.dma_dir );
ret = IRQ_HANDLED;
}
--------------------------------------------------------------------------------------------------------------------------------------
I think this gives you an idea how I hv done it.
Is there anything wrong with this method.
Thanx in advance.
Sumudu
