1#undef DEBUG 2 3#include <linux/kernel.h> 4#include <linux/string.h> 5#include <linux/pci_regs.h> 6#include <linux/module.h> 7#include <linux/ioport.h> 8#include <linux/etherdevice.h> 9#include <linux/of_address.h> 10#include <asm/prom.h> 11#include <asm/pci-bridge.h> 12 13#ifdef CONFIG_PCI 14int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq) 15{ 16 struct device_node *dn, *ppnode; 17 struct pci_dev *ppdev; 18 u32 lspec; 19 u32 laddr[3]; 20 u8 pin; 21 int rc; 22 23 /* Check if we have a device node, if yes, fallback to standard OF 24 * parsing 25 */ 26 dn = pci_device_to_OF_node(pdev); 27 if (dn) 28 return of_irq_map_one(dn, 0, out_irq); 29 30 /* Ok, we don't, time to have fun. Let's start by building up an 31 * interrupt spec. we assume #interrupt-cells is 1, which is standard 32 * for PCI. If you do different, then don't use that routine. 33 */ 34 rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin); 35 if (rc != 0) 36 return rc; 37 /* No pin, exit */ 38 if (pin == 0) 39 return -ENODEV; 40 41 /* Now we walk up the PCI tree */ 42 lspec = pin; 43 for (;;) { 44 /* Get the pci_dev of our parent */ 45 ppdev = pdev->bus->self; 46 47 /* Ouch, it's a host bridge... */ 48 if (ppdev == NULL) { 49 struct pci_controller *host; 50 host = pci_bus_to_host(pdev->bus); 51 ppnode = host ? host->dn : NULL; 52 /* No node for host bridge ? give up */ 53 if (ppnode == NULL) 54 return -EINVAL; 55 } else 56 /* We found a P2P bridge, check if it has a node */ 57 ppnode = pci_device_to_OF_node(ppdev); 58 59 /* Ok, we have found a parent with a device-node, hand over to 60 * the OF parsing code. 61 * We build a unit address from the linux device to be used for 62 * resolution. Note that we use the linux bus number which may 63 * not match your firmware bus numbering. 64 * Fortunately, in most cases, interrupt-map-mask doesn't 65 * include the bus number as part of the matching. 66 * You should still be careful about that though if you intend 67 * to rely on this function (you ship a firmware that doesn't 68 * create device nodes for all PCI devices). 69 */ 70 if (ppnode) 71 break; 72 73 /* We can only get here if we hit a P2P bridge with no node, 74 * let's do standard swizzling and try again 75 */ 76 lspec = pci_swizzle_interrupt_pin(pdev, lspec); 77 pdev = ppdev; 78 } 79 80 laddr[0] = (pdev->bus->number << 16) 81 | (pdev->devfn << 8); 82 laddr[1] = laddr[2] = 0; 83 return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq); 84} 85EXPORT_SYMBOL_GPL(of_irq_map_pci); 86#endif /* CONFIG_PCI */ 87 88void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop, 89 unsigned long *busno, unsigned long *phys, unsigned long *size) 90{ 91 const u32 *dma_window; 92 u32 cells; 93 const unsigned char *prop; 94 95 dma_window = dma_window_prop; 96 97 /* busno is always one cell */ 98 *busno = *(dma_window++); 99 100 prop = of_get_property(dn, "ibm,#dma-address-cells", NULL); 101 if (!prop) 102 prop = of_get_property(dn, "#address-cells", NULL); 103 104 cells = prop ? *(u32 *)prop : of_n_addr_cells(dn); 105 *phys = of_read_number(dma_window, cells); 106 107 dma_window += cells; 108 109 prop = of_get_property(dn, "ibm,#dma-size-cells", NULL); 110 cells = prop ? *(u32 *)prop : of_n_size_cells(dn); 111 *size = of_read_number(dma_window, cells); 112} 113 114/** 115 * Search the device tree for the best MAC address to use. 'mac-address' is 116 * checked first, because that is supposed to contain to "most recent" MAC 117 * address. If that isn't set, then 'local-mac-address' is checked next, 118 * because that is the default address. If that isn't set, then the obsolete 119 * 'address' is checked, just in case we're using an old device tree. 120 * 121 * Note that the 'address' property is supposed to contain a virtual address of 122 * the register set, but some DTS files have redefined that property to be the 123 * MAC address. 124 * 125 * All-zero MAC addresses are rejected, because those could be properties that 126 * exist in the device tree, but were not set by U-Boot. For example, the 127 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC 128 * addresses. Some older U-Boots only initialized 'local-mac-address'. In 129 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists 130 * but is all zeros. 131*/ 132const void *of_get_mac_address(struct device_node *np) 133{ 134 struct property *pp; 135 136 pp = of_find_property(np, "mac-address", NULL); 137 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) 138 return pp->value; 139 140 pp = of_find_property(np, "local-mac-address", NULL); 141 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) 142 return pp->value; 143 144 pp = of_find_property(np, "address", NULL); 145 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) 146 return pp->value; 147 148 return NULL; 149} 150EXPORT_SYMBOL(of_get_mac_address); 151