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12e84142 MS |
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> | |
1f5bef30 | 9 | #include <linux/of_address.h> |
12e84142 MS |
10 | #include <asm/prom.h> |
11 | #include <asm/pci-bridge.h> | |
12 | ||
12e84142 | 13 | #ifdef CONFIG_PCI |
12e84142 MS |
14 | int 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); | |
878194c8 | 51 | ppnode = host ? host->dn : NULL; |
12e84142 MS |
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 | */ | |
a8dcb878 | 76 | lspec = pci_swizzle_interrupt_pin(pdev, lspec); |
12e84142 MS |
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 | } | |
85 | EXPORT_SYMBOL_GPL(of_irq_map_pci); | |
86 | #endif /* CONFIG_PCI */ | |
87 | ||
12e84142 MS |
88 | void 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 | ||
12e84142 MS |
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 | */ | |
132 | const 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 | } | |
150 | EXPORT_SYMBOL(of_get_mac_address); |