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 rc = of_irq_map_one(dn, 0, out_irq); 29 if (!rc) 30 return rc; 31 } 32 33 /* Ok, we don't, time to have fun. Let's start by building up an 34 * interrupt spec. we assume #interrupt-cells is 1, which is standard 35 * for PCI. If you do different, then don't use that routine. 36 */ 37 rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin); 38 if (rc != 0) 39 return rc; 40 /* No pin, exit */ 41 if (pin == 0) 42 return -ENODEV; 43 44 /* Now we walk up the PCI tree */ 45 lspec = pin; 46 for (;;) { 47 /* Get the pci_dev of our parent */ 48 ppdev = pdev->bus->self; 49 50 /* Ouch, it's a host bridge... */ 51 if (ppdev == NULL) { 52#ifdef CONFIG_PPC64 53 ppnode = pci_bus_to_OF_node(pdev->bus); 54#else 55 struct pci_controller *host; 56 host = pci_bus_to_host(pdev->bus); 57 ppnode = host ? host->dn : NULL; 58#endif 59 /* No node for host bridge ? give up */ 60 if (ppnode == NULL) 61 return -EINVAL; 62 } else 63 /* We found a P2P bridge, check if it has a node */ 64 ppnode = pci_device_to_OF_node(ppdev); 65 66 /* Ok, we have found a parent with a device-node, hand over to 67 * the OF parsing code. 68 * We build a unit address from the linux device to be used for 69 * resolution. Note that we use the linux bus number which may 70 * not match your firmware bus numbering. 71 * Fortunately, in most cases, interrupt-map-mask doesn't include 72 * the bus number as part of the matching. 73 * You should still be careful about that though if you intend 74 * to rely on this function (you ship a firmware that doesn't 75 * create device nodes for all PCI devices). 76 */ 77 if (ppnode) 78 break; 79 80 /* We can only get here if we hit a P2P bridge with no node, 81 * let's do standard swizzling and try again 82 */ 83 lspec = pci_swizzle_interrupt_pin(pdev, lspec); 84 pdev = ppdev; 85 } 86 87 laddr[0] = (pdev->bus->number << 16) 88 | (pdev->devfn << 8); 89 laddr[1] = laddr[2] = 0; 90 return of_irq_map_raw(ppnode, &lspec, 1, laddr, out_irq); 91} 92EXPORT_SYMBOL_GPL(of_irq_map_pci); 93#endif /* CONFIG_PCI */ 94 95void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop, 96 unsigned long *busno, unsigned long *phys, unsigned long *size) 97{ 98 const u32 *dma_window; 99 u32 cells; 100 const unsigned char *prop; 101 102 dma_window = dma_window_prop; 103 104 /* busno is always one cell */ 105 *busno = *(dma_window++); 106 107 prop = of_get_property(dn, "ibm,#dma-address-cells", NULL); 108 if (!prop) 109 prop = of_get_property(dn, "#address-cells", NULL); 110 111 cells = prop ? *(u32 *)prop : of_n_addr_cells(dn); 112 *phys = of_read_number(dma_window, cells); 113 114 dma_window += cells; 115 116 prop = of_get_property(dn, "ibm,#dma-size-cells", NULL); 117 cells = prop ? *(u32 *)prop : of_n_size_cells(dn); 118 *size = of_read_number(dma_window, cells); 119} 120 121/** 122 * Search the device tree for the best MAC address to use. 'mac-address' is 123 * checked first, because that is supposed to contain to "most recent" MAC 124 * address. If that isn't set, then 'local-mac-address' is checked next, 125 * because that is the default address. If that isn't set, then the obsolete 126 * 'address' is checked, just in case we're using an old device tree. 127 * 128 * Note that the 'address' property is supposed to contain a virtual address of 129 * the register set, but some DTS files have redefined that property to be the 130 * MAC address. 131 * 132 * All-zero MAC addresses are rejected, because those could be properties that 133 * exist in the device tree, but were not set by U-Boot. For example, the 134 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC 135 * addresses. Some older U-Boots only initialized 'local-mac-address'. In 136 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists 137 * but is all zeros. 138*/ 139const void *of_get_mac_address(struct device_node *np) 140{ 141 struct property *pp; 142 143 pp = of_find_property(np, "mac-address", NULL); 144 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) 145 return pp->value; 146 147 pp = of_find_property(np, "local-mac-address", NULL); 148 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) 149 return pp->value; 150 151 pp = of_find_property(np, "address", NULL); 152 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) 153 return pp->value; 154 155 return NULL; 156} 157EXPORT_SYMBOL(of_get_mac_address); 158