113 строки
3.1 KiB
C
113 строки
3.1 KiB
C
#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/pci_regs.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/etherdevice.h>
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#include <linux/of_address.h>
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#include <asm/prom.h>
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#include <asm/pci-bridge.h>
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#ifdef CONFIG_PCI
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int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)
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{
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struct device_node *dn, *ppnode;
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struct pci_dev *ppdev;
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u32 lspec;
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u32 laddr[3];
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u8 pin;
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int rc;
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/* Check if we have a device node, if yes, fallback to standard OF
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* parsing
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*/
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dn = pci_device_to_OF_node(pdev);
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if (dn)
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return of_irq_map_one(dn, 0, out_irq);
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/* Ok, we don't, time to have fun. Let's start by building up an
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* interrupt spec. we assume #interrupt-cells is 1, which is standard
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* for PCI. If you do different, then don't use that routine.
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*/
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rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);
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if (rc != 0)
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return rc;
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/* No pin, exit */
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if (pin == 0)
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return -ENODEV;
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/* Now we walk up the PCI tree */
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lspec = pin;
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for (;;) {
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/* Get the pci_dev of our parent */
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ppdev = pdev->bus->self;
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/* Ouch, it's a host bridge... */
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if (ppdev == NULL) {
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struct pci_controller *host;
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host = pci_bus_to_host(pdev->bus);
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ppnode = host ? host->dn : NULL;
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/* No node for host bridge ? give up */
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if (ppnode == NULL)
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return -EINVAL;
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} else
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/* We found a P2P bridge, check if it has a node */
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ppnode = pci_device_to_OF_node(ppdev);
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/* Ok, we have found a parent with a device-node, hand over to
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* the OF parsing code.
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* We build a unit address from the linux device to be used for
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* resolution. Note that we use the linux bus number which may
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* not match your firmware bus numbering.
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* Fortunately, in most cases, interrupt-map-mask doesn't
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* include the bus number as part of the matching.
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* You should still be careful about that though if you intend
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* to rely on this function (you ship a firmware that doesn't
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* create device nodes for all PCI devices).
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*/
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if (ppnode)
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break;
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/* We can only get here if we hit a P2P bridge with no node,
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* let's do standard swizzling and try again
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*/
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lspec = pci_swizzle_interrupt_pin(pdev, lspec);
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pdev = ppdev;
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}
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laddr[0] = (pdev->bus->number << 16)
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| (pdev->devfn << 8);
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laddr[1] = laddr[2] = 0;
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return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq);
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}
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EXPORT_SYMBOL_GPL(of_irq_map_pci);
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#endif /* CONFIG_PCI */
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void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
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unsigned long *busno, unsigned long *phys, unsigned long *size)
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{
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const u32 *dma_window;
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u32 cells;
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const unsigned char *prop;
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dma_window = dma_window_prop;
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/* busno is always one cell */
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*busno = *(dma_window++);
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prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
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if (!prop)
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prop = of_get_property(dn, "#address-cells", NULL);
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cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
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*phys = of_read_number(dma_window, cells);
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dma_window += cells;
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prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
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cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
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*size = of_read_number(dma_window, cells);
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}
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