1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/of.h>
4 #include <linux/init.h>
5 #include <linux/module.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/errno.h>
8 #include <linux/irq.h>
9 #include <linux/of_device.h>
10 #include <linux/of_platform.h>
11 
12 #include "of_device_common.h"
13 
14 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
15 {
16 	struct platform_device *op = of_find_device_by_node(node);
17 
18 	if (!op || index >= op->archdata.num_irqs)
19 		return 0;
20 
21 	return op->archdata.irqs[index];
22 }
23 EXPORT_SYMBOL(irq_of_parse_and_map);
24 
25 int of_address_to_resource(struct device_node *node, int index,
26 			   struct resource *r)
27 {
28 	struct platform_device *op = of_find_device_by_node(node);
29 
30 	if (!op || index >= op->num_resources)
31 		return -EINVAL;
32 
33 	memcpy(r, &op->archdata.resource[index], sizeof(*r));
34 	return 0;
35 }
36 EXPORT_SYMBOL_GPL(of_address_to_resource);
37 
38 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
39  * BUS and propagate to all child platform_device objects.
40  */
41 void of_propagate_archdata(struct platform_device *bus)
42 {
43 	struct dev_archdata *bus_sd = &bus->dev.archdata;
44 	struct device_node *bus_dp = bus->dev.of_node;
45 	struct device_node *dp;
46 
47 	for (dp = bus_dp->child; dp; dp = dp->sibling) {
48 		struct platform_device *op = of_find_device_by_node(dp);
49 
50 		op->dev.archdata.iommu = bus_sd->iommu;
51 		op->dev.archdata.stc = bus_sd->stc;
52 		op->dev.archdata.host_controller = bus_sd->host_controller;
53 		op->dev.archdata.numa_node = bus_sd->numa_node;
54 
55 		if (dp->child)
56 			of_propagate_archdata(op);
57 	}
58 }
59 
60 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
61 {
62 	if (addrc)
63 		*addrc = of_n_addr_cells(dp);
64 	if (sizec)
65 		*sizec = of_n_size_cells(dp);
66 }
67 
68 /*
69  * Default translator (generic bus)
70  */
71 
72 void of_bus_default_count_cells(struct device_node *dev, int *addrc, int *sizec)
73 {
74 	get_cells(dev, addrc, sizec);
75 }
76 
77 /* Make sure the least significant 64-bits are in-range.  Even
78  * for 3 or 4 cell values it is a good enough approximation.
79  */
80 int of_out_of_range(const u32 *addr, const u32 *base,
81 		    const u32 *size, int na, int ns)
82 {
83 	u64 a = of_read_addr(addr, na);
84 	u64 b = of_read_addr(base, na);
85 
86 	if (a < b)
87 		return 1;
88 
89 	b += of_read_addr(size, ns);
90 	if (a >= b)
91 		return 1;
92 
93 	return 0;
94 }
95 
96 int of_bus_default_map(u32 *addr, const u32 *range, int na, int ns, int pna)
97 {
98 	u32 result[OF_MAX_ADDR_CELLS];
99 	int i;
100 
101 	if (ns > 2) {
102 		printk("of_device: Cannot handle size cells (%d) > 2.", ns);
103 		return -EINVAL;
104 	}
105 
106 	if (of_out_of_range(addr, range, range + na + pna, na, ns))
107 		return -EINVAL;
108 
109 	/* Start with the parent range base.  */
110 	memcpy(result, range + na, pna * 4);
111 
112 	/* Add in the child address offset.  */
113 	for (i = 0; i < na; i++)
114 		result[pna - 1 - i] +=
115 			(addr[na - 1 - i] -
116 			 range[na - 1 - i]);
117 
118 	memcpy(addr, result, pna * 4);
119 
120 	return 0;
121 }
122 
123 unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
124 {
125 	if (flags)
126 		return flags;
127 	return IORESOURCE_MEM;
128 }
129 
130 /*
131  * SBUS bus specific translator
132  */
133 
134 int of_bus_sbus_match(struct device_node *np)
135 {
136 	struct device_node *dp = np;
137 
138 	while (dp) {
139 		if (!strcmp(dp->name, "sbus") ||
140 		    !strcmp(dp->name, "sbi"))
141 			return 1;
142 
143 		/* Have a look at use_1to1_mapping().  We're trying
144 		 * to match SBUS if that's the top-level bus and we
145 		 * don't have some intervening real bus that provides
146 		 * ranges based translations.
147 		 */
148 		if (of_find_property(dp, "ranges", NULL) != NULL)
149 			break;
150 
151 		dp = dp->parent;
152 	}
153 
154 	return 0;
155 }
156 
157 void of_bus_sbus_count_cells(struct device_node *child, int *addrc, int *sizec)
158 {
159 	if (addrc)
160 		*addrc = 2;
161 	if (sizec)
162 		*sizec = 1;
163 }
164